CN113693302B - Electronic cigarette control method, electronic cigarette control device and electronic cigarette - Google Patents
Electronic cigarette control method, electronic cigarette control device and electronic cigarette Download PDFInfo
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- CN113693302B CN113693302B CN202111000384.3A CN202111000384A CN113693302B CN 113693302 B CN113693302 B CN 113693302B CN 202111000384 A CN202111000384 A CN 202111000384A CN 113693302 B CN113693302 B CN 113693302B
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- 239000003571 electronic cigarette Substances 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 334
- 238000005259 measurement Methods 0.000 claims description 11
- 230000008859 change Effects 0.000 abstract description 12
- 238000010438 heat treatment Methods 0.000 description 7
- 238000000889 atomisation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/50—Control or monitoring
- A24F40/53—Monitoring, e.g. fault detection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
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- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a control method of an electronic cigarette, a control device of the electronic cigarette and the electronic cigarette, wherein the control method of the electronic cigarette comprises the following steps: determining a first voltage detection value; determining a second voltage detection value; performing difference calculation on the first voltage detection value and the second voltage detection value to obtain an actual voltage detection value output by the capacitive air flow detection device; when the actual voltage detection value is larger than or equal to the reference voltage value, triggering the electronic cigarette to heat and atomize. According to the invention, the first voltage detection value and the second voltage detection value are respectively obtained under different charging current signals, and then the difference value calculation is carried out on the first voltage detection value and the second voltage detection value, so that an actual voltage detection value formula without an interference current value is obtained. The method eliminates the interference of the interference current on the air suction flow detection signal, solves the problem that the control device judges the air suction flow detection signal to be invalid due to the instant change of the current when the electronic cigarette works, and improves the stability of the electronic cigarette.
Description
Technical Field
The invention relates to the field of electronic cigarettes, in particular to a control method of an electronic cigarette, a control device of the electronic cigarette and the electronic cigarette.
Background
When the electronic cigarette works, the internal temperature is 220 ℃ to 300 ℃, and at the moment, the reverse saturation current (reverse saturation current) or leakage current (leakage current) of the electrostatic protection circuit can be exploded by more than one thousand times, and the instantaneous abrupt change of the interference current such as the reverse saturation current, the leakage current and the like can cause the control device to judge the misalignment of the inhalation airflow detection signal, namely the electronic cigarette can not work when a user inhales. Of course, in the using process of the electronic cigarette, the electronic cigarette can also be determined to be misaligned because of larger interference current generated by other factors such as instant overlarge current.
Disclosure of Invention
The invention mainly aims to provide a control method of an electronic cigarette, a control device of the electronic cigarette and the electronic cigarette, and aims to improve stability of the electronic cigarette due to influence of interference current during operation of the electronic cigarette.
In order to achieve the above object, the present invention provides a control method of an electronic cigarette, the electronic cigarette including a capacitive airflow detection device for outputting an inhalation airflow detection signal when detecting that the electronic cigarette is in an inhaled state, the control method of the electronic cigarette including the steps of:
when the electronic cigarette is detected to be in an air-breathing state, a first current value of the capacitive air flow detection device under the charging of a first charging current signal is obtained according to a first preset time period, and a first voltage detection value is determined according to the first current value, an equivalent capacitance value of the capacitive air flow detection device and the first preset time period;
acquiring a second current value of the capacitive air flow detection device under the charging of a second charging current signal according to the first preset time length, and determining a second voltage detection value according to the second current value, an equivalent capacitance value of the capacitive air flow detection device and the first preset time length; the first charging current signal is not equal to the second charging current signal;
performing difference calculation on the first voltage detection value and the second voltage detection value to obtain an actual voltage detection value output by the capacitive air flow detection device; and
when the actual voltage detection value is larger than or equal to the reference voltage value, triggering the electronic cigarette to heat and atomize.
In an embodiment, when the electronic cigarette is detected to be in the inhaled state, a first current value of the capacitive airflow detection device under the charging of the first charging current signal is obtained according to a first preset duration, and a first voltage detection value is determined according to the first current value, an equivalent capacitance value of the capacitive airflow detection device and the first preset duration, and before the step of controlling the electronic cigarette, the control method further includes:
outputting charging current to the capacitive air flow detection device according to a preset measurement period so as to enable the capacitive air flow detection device to be in a charging detection state; each measuring period comprises a first sub-period and a second sub-period, wherein the first sub-period of each measuring period outputs a first charging current signal to the capacitive air flow detection device, and the second sub-period of each measuring period outputs a second charging current signal to the capacitive air flow detection device.
In an embodiment, the determining the first voltage detection value according to the first current value, the equivalent capacitance value of the capacitive air flow detection device, and the first preset time period includes:
calculating the quotient of the first current value and the equivalent capacitance value of the capacitive air flow detection device;
and multiplying the quotient of the first current value and the equivalent capacitance value of the capacitive air flow detection device by a first preset time length to obtain a first voltage detection value.
In an embodiment, the determining the second voltage detection value according to the second current value, the equivalent capacitance value of the capacitive airflow detection device, and the first preset time period includes:
calculating the quotient of the second current value and the equivalent capacitance value of the capacitive air flow detection device;
and multiplying the quotient of the second current value and the equivalent capacitance value of the capacitive air flow detection device by a first preset duration to obtain a second voltage detection value.
The invention also provides a control device of the electronic cigarette, the electronic cigarette comprises a capacitive air flow detection device for outputting an air flow detection signal when the electronic cigarette is detected to be in an air-sucked state, and the control device of the electronic cigarette comprises:
the detection port is electrically connected with the capacitive airflow detection device;
the control circuit is electrically connected with the detection port and is used for detecting a first current value of the capacitive air flow detection device under the charging of a first charging current signal according to a first preset duration in a first sub-period when the electronic cigarette is detected to be in an air suction state, and determining a first voltage detection value according to the first current value, an equivalent capacitance value of the capacitive air flow detection device and the first preset duration;
the control circuit is further configured to detect a second current value of the capacitive airflow detection device in a second sub-period according to the first preset duration, where the second current value is charged by the second charging current signal, and determine a second voltage detection value according to the second current value, an equivalent capacitance value of the capacitive airflow detection device, and the first preset duration;
the control circuit is also used for carrying out difference value calculation on the first voltage detection value and the second voltage detection value to obtain an actual voltage detection value output by the capacitive air flow detection device; and
a comparison circuit for outputting a trigger signal when the actual voltage detection value is greater than or equal to a reference voltage value;
and the control circuit is also used for controlling the electronic cigarette to heat and atomize according to the trigger signal.
In an embodiment, the control device of the electronic cigarette further includes:
the current source is electrically connected with the detection port;
the control circuit is also used for controlling the current source to output charging current to the capacitive air flow detection device according to a preset measurement period so as to enable the capacitive air flow detection device to be in a charging detection state; each measuring period comprises a first sub-period and a second sub-period, the current source is controlled to output a first charging current signal to the capacitive air flow detection device in the first sub-period of each measuring period, and the current source is controlled to output a second charging current signal to the capacitive air flow detection device in the second sub-period of each measuring period.
In an embodiment, the control circuit is further configured to calculate a quotient of the first current value and an equivalent capacitance value of the capacitive airflow detecting device, and multiply the quotient of the first current value and the equivalent capacitance value of the capacitive airflow detecting device with a first preset duration to obtain a first voltage detection value.
In an embodiment, the control circuit is further configured to calculate a quotient of the second current value and an equivalent capacitance value of the capacitive airflow detecting device, and multiply the quotient of the second current value and the equivalent capacitance value of the capacitive airflow detecting device with a first preset duration to obtain a second voltage detection value.
In an embodiment, the control device of the electronic cigarette further includes:
and the electrostatic protection circuit is electrically connected with the detection port.
The invention also provides an electronic cigarette, which comprises a capacitive air flow detection device for outputting an air flow detection signal when the electronic cigarette is detected to be in an air suction state, and the electronic cigarette control device, wherein a detection interface of the electronic cigarette control device is electrically connected with the capacitive air flow detection device.
In one embodiment, the capacitive air flow detection device is a capacitive microphone.
According to the invention, the first voltage detection value and the second voltage detection value are respectively obtained under different charging current signals, and then the difference value calculation is carried out on the first voltage detection value and the second voltage detection value, so that an actual voltage detection value formula without an interference current value is obtained. The method eliminates the interference of the interference current on the air suction flow detection signal, solves the problem that the control device judges the air suction flow detection signal to be invalid due to the instant change of the current when the electronic cigarette works, and improves the stability of the electronic cigarette.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart illustrating steps of an embodiment of a method for controlling an electronic cigarette according to the present invention;
FIG. 2 is a flowchart illustrating steps of an embodiment of a method for controlling an electronic cigarette according to the present invention;
FIG. 3 is a flowchart illustrating steps of an embodiment of a method for controlling an electronic cigarette according to the present invention;
FIG. 4 is a schematic structural diagram of an embodiment of a control device for an electronic cigarette according to the present invention;
fig. 5 is a schematic structural diagram of an embodiment of a control device for an electronic cigarette according to the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Referring to fig. 1, the present invention proposes a control method of an electronic cigarette, where the electronic cigarette includes a capacitive airflow detection device for outputting an inhalation airflow detection signal when detecting that the electronic cigarette is in an inhaled state.
Taking the leakage current of the electrostatic protection circuit as an example, when a user uses the electronic cigarette, the user can contact with the main body of the electronic cigarette to generate electrostatic Discharge (ESD-Electro-Static Discharge), the ESD generated by the human body is high voltage of thousands of volts, the high voltage pulse can invade the internal circuit of the electronic cigarette to damage the internal circuit, and misoperation of the internal circuit is caused, so that the damage is destructive and permanent. In order to prevent ESD from invading the electronic cigarette, the internal circuit is designed with an electrostatic protection circuit at the input/output (I/O) pins.
The working principle of the electronic cigarette is as follows: when a user inhales, the capacitive air flow detection device responds to the inhalation air flow detection signal and outputs the inhalation air flow detection signal to the control device, and the control device drives the heating wire and the atomizer to start working to generate smoke. When the user stops inhaling, the capacitive air flow detection device has no signal output, the control device stops working, and the heating wire and the atomizer stop working. The working temperature of the heating wire is usually 220-300 ℃, and when the heating wire works, the temperature rising value in the electronic cigarette can instantly exceed 100 ℃. The calculation formula of the leakage current of the electrostatic protection circuit isWherein T1 is the original temperature, and T2 is the temperature after rising. When the heating wire works, the electrostatic protection circuit is affected by high temperature, and the leakage current of the electrostatic protection circuit can be instantaneously increased by more than 1000 times. For example, if the internal temperature of the electronic cigarette is instantaneously raised from 25 ℃ to 125 ℃, the leakage current instantaneously bursts 1024 times. The instantaneous change of the current can interfere with the inhalation air flow detection signal received by the control device, so that the control device judges the inhalation air flow detection signal to be out of alignment, namely, inhalation action of a user can be invalid, and smoke cannot be generated.
In order to solve the problem of misalignment of the electronic cigarette due to the instantaneous current change, referring to fig. 1, in an embodiment of the invention, a control method of the electronic cigarette includes the following steps:
step S100: when the electronic cigarette is detected to be in the air-breathing state, a first current value of the capacitive air flow detection device under the charging of the first charging current signal is obtained according to a first preset time period, and a first voltage detection value is determined according to the first current value, an equivalent capacitance value of the capacitive air flow detection device and the first preset time period.
Step S200: acquiring a second current value of the capacitive air flow detection device under the charging of a second charging current signal according to a first preset time length, and determining a second voltage detection value according to the second current value, an equivalent capacitance value of the capacitive air flow detection device and the first preset time length; the first charging current signal is not equal to the second charging current signal.
Step S300: and calculating the difference value between the first voltage detection value and the second voltage detection value to obtain an actual voltage detection value output by the capacitive air flow detection device.
Step S400: when the actual voltage detection value is greater than or equal to the reference voltage value, triggering the electronic cigarette to heat and atomize.
In this embodiment, the first charging current signal and the second charging current signal may be provided by two current sources respectively, or may be provided by a control chip of the charging current source outputting different amounts of current in a time-sharing manner, or may be provided by a current adjusting circuit receiving a power supply signal for current size adjustment. In an embodiment, the electronic cigarette further comprises a control device for outputting the charging current to the capacitive air flow detection device, performing a difference calculation on the first voltage detection value and the second voltage detection value, and comparing the actual voltage detection value with the reference voltage value.
The control device outputs a first charging current signal and a second charging current signal to the capacitive air flow detection device in a wheel flow manner, and charges the capacitive air flow detection device. When a user inhales, the air flow changes, and the voltage at two ends of the capacitive air flow detection device changes, namely the voltage value at the two ends of the capacitive air flow detection device is the actual voltage detection value output to the control device by the capacitive air flow detection device.
In order to calculate the voltage value of the change at two ends of the capacitive air flow detection device, first, a first voltage detection value of the capacitive air flow detection device under the charging of a first charging current signal is calculated, and a calculation formula is a first preset valueThe formula:wherein T is a first preset duration, I 1 -I 0 At a first current value, I 1 For the first charging current value, I 0 For the interference current value, C is the equivalent capacitance value of the capacitive air flow detection device.
And then calculating a second voltage detection value of the capacitive air flow detection device under the charging of a second charging current signal, wherein the calculation formula is a second preset formula:wherein T is a first preset duration, I 2 -I 0 At a second current value, I 2 For the first charging current value, I 0 For the interference current value, C is the equivalent capacitance value of the capacitive air flow detection device.
Performing difference calculation on the first voltage detection value and the second voltage detection value to obtain voltage values of the changes at two ends of the capacitive air flow detection device:i.e. the actual voltage detection value output by the capacitive air flow detection device to the control device is +.>And performing difference calculation to eliminate the interference current value in the first voltage detection value and the second voltage detection value, wherein the obtained actual voltage detection value does not contain interference current components. Thus, the interference of the interference current on the suction air flow detection signal can be eliminated.
The control device compares the actual voltage detection value with the reference voltage value, and when the actual voltage detection value is greater than or equal to the reference voltage value, the control device triggers the electronic cigarette to heat and atomize.
The first charging current signal and the second charging current signal are both constant current signals. And during the output period of the first charging current signal and the second charging current signal, a first preset duration is taken. Since the first preset time period is small in practical application, usually in units of milliseconds, it can be considered that the first current value within the first preset time period is also constant. Similarly, the second current value within the first preset time period may also be considered constant. And taking a first preset time length under the first charging current signal and the second charging current signal, and respectively obtaining a first current value and a second current value in the first preset time length so as to facilitate the calculation of a difference value.
According to the invention, the first voltage detection value and the second voltage detection value are respectively obtained under different charging current signals, and then the difference value calculation is carried out on the first voltage detection value and the second voltage detection value, so that an actual voltage detection value formula without interference current components is obtained, and an actual voltage detection value output to the control device by the capacitive air flow detection device is calculated. Therefore, the interference of the interference current on the air suction flow detection signal can be eliminated, the problem that the control device judges the air suction flow detection signal to be invalid due to the instant change of the current when the electronic cigarette works is solved, and the stability of the electronic cigarette is improved.
Referring to fig. 2, in an embodiment, when it is detected that the electronic cigarette is in the inhaled state, a first current value of the capacitive airflow detecting device under the charging of the first charging current signal is obtained according to a first preset duration, and before the step of determining the first voltage detection value according to the first current value, the equivalent capacitance value of the capacitive airflow detecting device, and the first preset duration, the control method further includes:
outputting charging current to the capacitive air flow detection device according to a preset measurement period so as to enable the capacitive air flow detection device to be in a charging detection state; each measuring period comprises a first sub-period and a second sub-period, wherein the first sub-period of each measuring period outputs a first charging current signal to the capacitive air flow detection device, and the second sub-period of each measuring period outputs a second charging current signal to the capacitive air flow detection device.
In this embodiment, the duration of the first sub-period and the second sub-period may be the same or different, which is not limited herein. The control device outputs a charging current signal to the capacitive air flow detection device according to a preset measurement period so as to charge the capacitive air flow detection device. When a user inhales, the air flow changes, and the voltage at two ends of the capacitive air flow detection device changes, namely the voltage value at the two ends of the capacitive air flow detection device is the actual voltage detection value output to the control device by the capacitive air flow detection device.
In the embodiment, the preset measurement period is divided into a first sub-period and a second sub-period, and the capacitive air flow detection device is charged by different charging current signals in different sub-periods to generate different first current values and second current values, so that the first voltage detection value and the second voltage detection value can be subjected to difference calculation, and interference current is eliminated.
Referring to fig. 3, in an embodiment, determining a first voltage detection value according to a first current value, an equivalent capacitance value of a capacitive air flow detection device, and a first preset time period includes:
s110: and calculating the quotient of the first current value and the equivalent capacitance value of the capacitive air flow detection device.
S120: and multiplying the quotient of the first current value and the equivalent capacitance value of the capacitive air flow detection device by a first preset time length to obtain a first voltage detection value.
From the conservation of energy, the electrical quantity q=c=v=i×t, i.e.From this, the formula for calculating the first voltage detection value is a first preset formula: />Wherein T is a first preset duration, I 1 -I 0 At a first current value, I 1 For the first charging current value, I 0 For the interference current value, C is the equivalent capacitance value of the capacitive air flow detection device.
The invention creatively applies an electric quantity formula, and derives a calculation formula of a first voltage detection value from Q=C=V=I×TThe first voltage detection value is converted into a first preset time length, a first current value and an equivalent capacitance value of the capacitive air flow detection device to express, so that the difference value calculation is facilitated.
Referring to fig. 4, in an embodiment, determining the second voltage detection value according to the second current value, the equivalent capacitance value of the capacitive air flow detection device, and the first preset time period includes:
s210: and calculating the quotient of the second current value and the equivalent capacitance value of the capacitive air flow detection device.
S220: and multiplying the quotient of the second current value and the equivalent capacitance value of the capacitive air flow detection device by the first preset time length to obtain a second voltage detection value.
From the conservation of energy, the electrical quantity q=c=v=i×t, i.e.From this, the formula for calculating the first voltage detection value is a second preset formula: />Wherein T is a first preset duration, I 2 -I 0 At a second current value, I 2 For the first charging current value, I 0 For the interference current value, C is the equivalent capacitance value of the capacitive air flow detection device.
The invention creatively applies an electric quantity formula, and derives a calculation formula of a first voltage detection value from Q=C=V=I×TAnd converting the second voltage detection value into a first preset duration, a second current value and an equivalent capacitance value of the capacitive air flow detection device to express, so that the difference value calculation is facilitated.
In this embodiment, a formula of the first voltage detection value and the second voltage detection value is derived through an electric quantity formula, so as to calculate a difference value between the first voltage detection value and the second voltage detection value, eliminate an interference current value, and obtain an actual voltage detection value output to the control device by the capacitive air flow detection device. Therefore, the actual voltage detection value in any measuring period is irrelevant to the interference current, the interference of the interference current on the air suction flow detection signal is eliminated, the problem that the control device judges that the air suction flow detection signal is invalid due to the instant change of the current when the electronic cigarette works is solved, and the stability of the electronic cigarette is improved.
The principles of the present invention will be described with reference to the accompanying drawings in which:
the first charging current signal is output to the capacitive air flow detection device in a first sub-period of each measuring period, and the second charging current signal is output to the capacitive air flow detection device in a second sub-period of each measuring period. When the electronic cigarette is detected to be in an air-breathing state, a first current value and a second current value of the capacitive air flow detection device under the charging of the first charging current signal and the second charging current signal are respectively obtained according to a first preset time length, the first current value, the equivalent capacitance value of the capacitive air flow detection device and the first preset time length are substituted into a first preset formula to determine a first voltage detection value, and the second current value, the equivalent capacitance value of the capacitive air flow detection device and the first preset time length are substituted into a second preset formula to determine a second voltage detection value. And carrying out difference calculation on the first voltage detection value and the second voltage detection value to obtain an actual voltage detection value output by the capacitive air flow detection device. When the actual voltage detection value is greater than or equal to the reference voltage value, triggering the electronic cigarette to heat and atomize.
According to the invention, the preset measuring period is divided into the first sub-period and the second sub-period, and the capacitive air flow detection device is charged through different charging current signals in different sub-periods to obtain different first current values and second current values, so that the first voltage detection value and the second voltage detection value can be subjected to difference calculation, and an actual voltage detection value formula without interference current is obtained. Therefore, the interference of the interference current on the air suction flow detection signal can be eliminated, the problem that the control device judges the air suction flow detection signal to be invalid due to the instant change of the current when the electronic cigarette works is solved, and the stability of the electronic cigarette is improved.
Referring to fig. 4 and 5, the present invention further provides a control device for an electronic cigarette, where the electronic cigarette includes a capacitive airflow detection device for outputting an inhalation airflow detection signal when the electronic cigarette is detected to be in an inhaled state, and the control device for the electronic cigarette includes:
the detection port 100 is electrically connected to the capacitive air flow detection device.
The control circuit 200 is electrically connected to the detection port 100, and is configured to detect, in a first sub-period, a first current value of the capacitive airflow detection device when the electronic cigarette is in the inhaled state according to a first preset duration, where the first current value is charged by the first charging current signal, and determine a first voltage detection value according to the first current value, an equivalent capacitance value of the capacitive airflow detection device, and the first preset duration.
The control circuit 200 is further configured to detect a second current value of the capacitive air flow detection device in the second sub-period according to the first preset duration, where the second current value is charged by the second charging current signal, and determine a second voltage detection value according to the second current value, an equivalent capacitance value of the capacitive air flow detection device, and the first preset duration.
The control circuit 200 is further configured to perform a difference calculation on the first voltage detection value and the second voltage detection value, so as to obtain an actual voltage detection value output by the capacitive airflow detection device.
The comparison circuit 300 is used for outputting a trigger signal when the actual voltage detection value is greater than or equal to the reference voltage value.
The control circuit 200 is further used for controlling the electronic cigarette to perform heating and atomization according to the trigger signal.
In the above embodiment, the comparator circuit 300 may be a comparator.
When a user inhales, the control circuit 200 detects a first current value of the capacitive air flow detection device in a first sub-period according to a first preset duration through the detection port 100 under the charging of a first charging current signal, so as to obtain a first voltage detection value; and detecting a second current value of the capacitive air flow detection device under the charging of a second charging current signal according to the first preset time length in a second sub-period, so as to obtain a second voltage detection value. The control circuit 200 calculates a difference between the first voltage detection value and the second voltage detection value to obtain an actual voltage detection value output by the capacitive air flow detection device, and outputs the actual voltage detection value to the first input end of the comparison circuit 300. The comparison circuit 300 compares the actual voltage detection value with a preset reference voltage value, and outputs a trigger signal to the control circuit 200 when the actual voltage detection value is greater than or equal to the reference voltage value. The control circuit 200 drives the electronic cigarette to perform heating and atomization.
In practical application, the reference voltage value can be set according to the requirement. For example, when the comparison circuit 300 is required to protect the subsequent circuit, a larger reference voltage value can be set to prevent the subsequent circuit from being damaged by the large current; when the comparison circuit 300 is required to output the trigger signal, a smaller voltage value may be set, and when the actual voltage detection value reaches the reference voltage value, the trigger signal is output.
The invention obtains the actual voltage detection value output by the capacitive air flow detection device through the control circuit 200, outputs the actual voltage detection value to the first input end of the comparison circuit 300, compares the actual voltage detection value with the reference voltage value through the comparison circuit 300, and outputs a trigger signal when the actual voltage detection value reaches the reference voltage value. The method eliminates the interference of the interference current on the air suction flow detection signal, solves the problem that the control device judges the air suction flow detection signal to be invalid due to the instant change of the current when the electronic cigarette works, and improves the stability of the electronic cigarette.
In an embodiment, the control device of the electronic cigarette further includes a current source 400.
The current source 400 is electrically connected to the detection port 100.
The control circuit 200 is further configured to control the current source 400 to output a charging current to the capacitive air flow detection device according to a preset measurement period, so that the capacitive air flow detection device is in a charging detection state; each measurement period includes a first sub-period and a second sub-period, wherein the first sub-period of each measurement period controls the current source 400 to output a first charging current signal to the capacitive air flow detection device, and the second sub-period of each measurement period controls the current source 400 to output a second charging current signal to the capacitive air flow detection device.
In the above embodiment, the current source 400 further includes the first switch. The input of the first switch is connected to both the output of the current source 400 and the control circuit 200, and the output of the first switch is grounded. When the time period reaches the set value, the control circuit 200 controls the switch to be closed and grounded, so that the voltage output of the capacitive air flow detection device is zeroed, and the voltage output is accumulated again.
In this embodiment, the current source 400 generates a variable current, the first charging current signal is output in the first sub-period, the second charging current signal is output in the second sub-period to generate different first current values and second current values, and only the disturbance current value is eliminated when the difference between the first voltage detection value and the second voltage detection value is calculated. Therefore, interference of the interference current on the air suction airflow detection signal is eliminated, and stability of the electronic cigarette is improved.
In an embodiment, the control circuit 200 is further configured to calculate a quotient of the first current value and an equivalent capacitance value of the capacitive air flow detection device, and multiply the quotient of the first current value and the equivalent capacitance value of the capacitive air flow detection device with a first preset duration to obtain a first voltage detection value.
The control circuit 200 substitutes the first current value, the equivalent capacitance value of the capacitive air flow detection device and the first preset time length into a first preset formula to obtain a first voltage detection value.
The invention creatively applies an electric quantity formula, and derives a calculation formula of a first voltage detection value from Q=C=V=I×TThe first voltage detection value is converted into a first preset time length, a first current value and an equivalent capacitance value of the capacitive air flow detection device to express, so that the difference value calculation is facilitated.
In an embodiment, the control circuit 200 is further configured to calculate a quotient of the second current value and an equivalent capacitance value of the capacitive air flow detection device, and multiply the quotient of the second current value and the equivalent capacitance value of the capacitive air flow detection device with the first preset duration to obtain a second voltage detection value.
The control circuit 200 substitutes the second current value, the equivalent capacitance value of the capacitive air flow detection device and the first preset time length into a second preset formula to obtain a second voltage detection value.
The invention creatively applies an electric quantity formula, and derives a calculation formula of a first voltage detection value from Q=C=V=I×TAnd converting the second voltage detection value into a first preset duration, a second current value and an equivalent capacitance value of the capacitive air flow detection device to express, so that the difference value calculation is facilitated.
In one embodiment, the electronic cigarette control device further includes an electrostatic protection circuit 500 electrically connected to the detection port 100.
The electrostatic protection circuit 500 is used for preventing static electricity from invading into the electronic cigarette, damaging the internal circuit and causing misoperation of the internal circuit.
The invention also provides an electronic cigarette, which comprises the capacitive air flow detection device 10 for outputting the air flow detection signal when the electronic cigarette is detected to be in the air suction state, and the electronic cigarette control device 20, wherein a detection interface of the electronic cigarette control device 20 is electrically connected with the capacitive air flow detection device 10.
The detailed structure of the control device can refer to the above embodiment, and will not be described herein; it can be understood that, because the control device is used in the electronic cigarette of the present invention, the embodiments of the electronic cigarette of the present invention include all the technical solutions of all the embodiments of the control device, and the achieved technical effects are identical, and are not repeated herein.
In one embodiment, the capacitive air flow detection device 10 is a capacitive microphone.
When a user inhales, the air flow causes voltage change at two ends of the capacitive microphone, and when the voltage change reaches a certain value, the electronic cigarette is triggered to heat and atomize. Compared with the traditional mechanical microphone, the capacitive microphone has higher sensitivity, better anti-interference performance, lower requirements on manufacturing process and convenience in mass production.
The foregoing description of the embodiments of the present invention is merely an optional embodiment of the present invention, and is not intended to limit the scope of the invention, and all equivalent structural modifications made by the present invention in the light of the present invention, the description of which and the accompanying drawings, or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (11)
1. The electronic cigarette comprises a capacitive air flow detection device for outputting an air flow detection signal when the electronic cigarette is detected to be in an air-sucked state, and is characterized by comprising the following steps of:
when the electronic cigarette is detected to be in an air-breathing state, a first current value of the capacitive air flow detection device under the charging of a first charging current signal is obtained according to a first preset time period, and a first voltage detection value is determined according to the first current value, an equivalent capacitance value of the capacitive air flow detection device and the first preset time period;
acquiring a second current value of the capacitive air flow detection device under the charging of a second charging current signal according to the first preset time length, and determining a second voltage detection value according to the second current value, an equivalent capacitance value of the capacitive air flow detection device and the first preset time length; the first charging current signal is not equal to the second charging current signal;
performing difference calculation on the first voltage detection value and the second voltage detection value to obtain an actual voltage detection value output by the capacitive air flow detection device; and
when the actual voltage detection value is larger than or equal to the reference voltage value, triggering the electronic cigarette to heat and atomize.
2. The method for controlling an electronic cigarette according to claim 1, wherein when the electronic cigarette is detected to be in an inhaled state, a first current value of the capacitive air flow detection device under the charging of the first charging current signal is obtained according to a first preset time period, and a first voltage detection value is determined according to the first current value, an equivalent capacitance value of the capacitive air flow detection device, and the first preset time period, the method further comprises:
outputting charging current to the capacitive air flow detection device according to a preset measurement period so as to enable the capacitive air flow detection device to be in a charging detection state; each measuring period comprises a first sub-period and a second sub-period, wherein the first sub-period of each measuring period outputs a first charging current signal to the capacitive air flow detection device, and the second sub-period of each measuring period outputs a second charging current signal to the capacitive air flow detection device.
3. The method of claim 1, wherein the determining the first voltage detection value according to the first current value, the equivalent capacitance value of the capacitive airflow detection device, and the first preset time period comprises:
calculating the quotient of the first current value and the equivalent capacitance value of the capacitive air flow detection device;
and multiplying the quotient of the first current value and the equivalent capacitance value of the capacitive air flow detection device by a first preset time length to obtain a first voltage detection value.
4. The method of claim 1 or 3, wherein determining the second voltage detection value according to the second current value, the equivalent capacitance value of the capacitive airflow detection device, and the first preset time period comprises:
calculating the quotient of the second current value and the equivalent capacitance value of the capacitive air flow detection device;
and multiplying the quotient of the second current value and the equivalent capacitance value of the capacitive air flow detection device by a first preset duration to obtain a second voltage detection value.
5. An electronic cigarette control device, characterized in that the electronic cigarette comprises a capacitive air flow detection device for outputting an air flow detection signal when detecting that the electronic cigarette is in an inhaled state, the electronic cigarette control device comprising:
the detection port is electrically connected with the capacitive airflow detection device;
the control circuit is electrically connected with the detection port and is used for detecting a first current value of the capacitive air flow detection device under the charging of a first charging current signal according to a first preset duration in a first sub-period when the electronic cigarette is detected to be in an air suction state, and determining a first voltage detection value according to the first current value, an equivalent capacitance value of the capacitive air flow detection device and the first preset duration;
the control circuit is further used for detecting a second current value of the capacitive air flow detection device under the charging of a second charging current signal according to the first preset time length in a second sub-period, and determining a second voltage detection value according to the second current value, an equivalent capacitance value of the capacitive air flow detection device and the first preset time length;
the control circuit is also used for carrying out difference value calculation on the first voltage detection value and the second voltage detection value so as to obtain an actual voltage detection value output by the capacitive air flow detection device; and
a comparison circuit for outputting a trigger signal when the actual voltage detection value is greater than or equal to a reference voltage value;
the control circuit is also used for controlling the electronic cigarette to heat and atomize according to the trigger signal.
6. The control device of the electronic cigarette of claim 5, wherein the control device of the electronic cigarette further comprises:
the current source is electrically connected with the detection port;
the control circuit is also used for controlling the current source to output charging current to the capacitive air flow detection device according to a preset measurement period so as to enable the capacitive air flow detection device to be in a charging detection state; each measuring period comprises a first sub-period and a second sub-period, the current source is controlled to output a first charging current signal to the capacitive air flow detection device in the first sub-period of each measuring period, and the current source is controlled to output a second charging current signal to the capacitive air flow detection device in the second sub-period of each measuring period.
7. The electronic cigarette control device of claim 6, wherein the control circuit is further configured to calculate a quotient of the first current value and an equivalent capacitance of the capacitive airflow detection device, and multiply the quotient of the first current value and the equivalent capacitance of the capacitive airflow detection device with a first preset time period to obtain a first voltage detection value.
8. The electronic cigarette control device according to claim 6 or 7, wherein the control circuit is further configured to calculate a quotient of the second current value and an equivalent capacitance value of the capacitive airflow detection device, and multiply the quotient of the second current value and the equivalent capacitance value of the capacitive airflow detection device with a first preset time period to obtain a second voltage detection value.
9. The control device of the electronic cigarette of claim 5, wherein the control device of the electronic cigarette further comprises:
and the electrostatic protection circuit is electrically connected with the detection port.
10. An electronic cigarette, comprising a capacitive airflow detection device for outputting an inhalation airflow detection signal when the electronic cigarette is detected to be in an inhaled state, and a control device for the electronic cigarette according to any one of claims 5 to 9, wherein a detection interface of the control device for the electronic cigarette is electrically connected with the capacitive airflow detection device.
11. The electronic cigarette of claim 10, wherein the capacitive airflow detection device is a capacitive microphone.
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| CN114403514B (en) * | 2022-02-28 | 2024-08-27 | 潍坊正达实业有限公司 | Indicator light control method and circuit, electronic cigarette device and storage medium |
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