CN112770447A

CN112770447A - Power line-based communication device and LED lighting system adopting same

Info

Publication number: CN112770447A
Application number: CN201911000794.0A
Authority: CN
Inventors: 朴光延; 李尚全; 朴齐兴; 金正律
Original assignee: Softkernel Co ltd
Current assignee: Softkernel Co ltd
Priority date: 2019-10-21
Filing date: 2019-10-21
Publication date: 2021-05-07

Abstract

The invention relates to a communication device based on a power line, which can receive and transmit control information data through the power line, and also provides an LED lighting system controlled by the communication device. The LED lighting device includes: one or more control devices connected to a commercial power supply via a power line, one or more LED lighting devices connected to the respective control devices via a power line, and a management device communicating with the control devices; the control device and the LED lighting device realize data receiving and sending through a power line, data communication from the control device to the LED lighting device is realized through a broadcasting method, and data communication from the LED lighting device to the control device is realized through a polling method.

Description

Power line-based communication device and LED lighting system adopting same

Technical Field

The invention relates to a communication device which is based on a power line and can be used for data receiving and sending, in particular to a communication device based on the power line and an LED lighting system adopting the communication device.

Background

In recent years, LEDs (light emitting diodes) are widely used in lighting apparatuses or lighting systems. Compared with the traditional fluorescent lamp, incandescent lamp or halogen tungsten lamp, the LED lighting equipment has the most remarkable advantages of low energy consumption and long service life. At present, lighting devices are used in almost all homes and buildings, and are usually driven by high voltage ac power. The LED lighting device is generally constructed of a PN structure and is driven by a dc low voltage power supply.

With regard to the suitability of the lighting device, since the LED lighting device is required to be used in the existing wiring conditions, i.e. directly on an ac power supply, it is often necessary to equip the LED lighting device with a rectifier or other drive means for this purpose. An LED driving apparatus is used to solve the problem of using LEDs in an ac power supply. However, the LED driving device is expensive, so that the unit price of the LED lighting device is high, and the LED lighting device cannot be popularized.

LED lighting devices have the significant advantage of being easy to dim (or dim control). The LED lighting device can control various different lighting environments through dimming, so that the energy consumption is further reduced. The dimming control is realized by adjusting the power supply quantity of the LED or the LED module power supply. The driving of the LEDs typically employs a driving means to drive the LED module or the LED lighting device. The driving of the LEDs and LED modules may employ PWM (pulse width modulator) dimming to control the load (duty) of the driving power supply. The driving component receives control data provided by other external communication components in a wired or wireless mode, and dimming is carried out according to the control data.

Generally, a plurality of expensive components are required to realize wireless communication, which leads to increase in manufacturing, using and maintaining costs of the LED lighting device; and the wired communication requires an additional communication line, thereby increasing the installation difficulty of the lighting device. And it is particularly difficult to install the LED lighting device on the existing wiring basis.

Korean patent KR10-1142106 (patent name: dimmable constant current converter) discloses a method of varying the input voltage of an LED lighting device using an LED group dimming device. The power supply of the LED module is 220V, 210V, 200V or 190V, and the like. The converter at the LED end can properly adjust the amount of power connected to the LED according to the external power voltage, i.e. control dimming. However, in the driving means, the control means and the converter do not communicate with each other, and dimming control is performed by a voltage of an external driving power supply. Therefore, it is not possible to ensure stable operation of the LED lighting device, and various driving controls, i.e., various dimming controls, cannot be realized.

Further, korean patent No. 10-0261512 (patent name: remote control method of bidirectional power communication) and korean patent No. 10-0473526 (patent name: remote control apparatus based on power line) disclose a method of bidirectional communication using power line and a structure of a remotely controllable power supply apparatus. However, this control device has problems such as an excessively complicated structure and high manufacturing cost.

Disclosure of Invention

One of the objects of the present invention is to provide a power line-based two-way communication apparatus having a simple structure and convenient management, which fundamentally solves the above problems.

Another object of the present invention is to provide an LED lighting system using the above communication device.

In order to achieve the purpose, the invention provides the following technical scheme: the power line-based communication device includes:

a control device provided on the power line, a load control device provided on the load; the control device and the load control device receive and transmit data through a power line; the control device includes: first data transmission means for transmitting data by the load control device in a first data interval, first data reception means for receiving data by the load control device in a second data interval; the load control device includes: a second data receiving and transmitting means for receiving data transmitted from the control device in a first data interval, and a second data transmitting means for transmitting data to the control device in a second data interval; the first data interval includes at least: one of a first interval in which a power supply current starts to rise from a zero-cross point, a second interval in which the power supply current starts to fall from the zero-cross point, a third interval in which the power supply current rises to the zero-cross point, and a fourth interval in which the power supply current starts to fall from the zero-cross point; the second data interval includes: at least one of the first interval, the second interval, the third interval and the fourth interval which is not selected by the first data interval; the first data transfer means is set to: setting the power supply voltage level supplied by the load control device to be 0 according to the data transmitted by the load control device; the second data transmission mechanism is used for selectively forming current pulses by the current flowing from the control device to the load control device according to the data transmitted by the control device; the control device further includes: a communication means for communicating with the outside; the first data transfer means comprises: a first voltage detection means for detecting a voltage change on the power line, a voltage cutoff means for cutting off a load voltage provided on the power line, and a first control means for controlling an operation of the voltage cutoff means; the first data receiving means further comprises: current detection means for detecting a power supply current; the first control means selectively driving the voltage cut-off means in a first data interval based on the data value transmitted to the load control means, the second data interval receiving data transmitted by the load control device by detecting a current pulse; the second data receiving means further comprises: second voltage detection means for detecting a voltage change on the power line and second control means for receiving data transmitted to the control device based on the second voltage detection means detected voltage in the first data section; the second data transfer means further comprises: a power supply means for driving an input power supply of the load and cutting off a power supply current of the load power supply in the second data section through the power line; a pulse generating means provided on the power line for controlling generation of a current pulse based on the second control means; the second control means drives the pulse generating means in the second data interval based on the data value transmitted to the control device.

Optionally, the first interval is an interval of 0.5ms before a zero crossing of the supply current.

Optionally, the first interval is a 0.5ms interval in which the power supply current rises from a zero-crossing point.

In another aspect, the present invention provides another communication apparatus based on a power line, including:

a first control member provided on the power line, a second control member provided on the load;

the first control component and the second control component transmit and receive data through a power line;

the first control means changes the voltage level of the load power supply to a corresponding value in a first section within one cycle through the power line based on the data transmitted to the second control means.

Optionally, the second control means varies the current level of the load power supply to a corresponding value in a second interval within one cycle through the power line based on the data transmitted to the first control means.

Optionally, the first interval is a 0.5ms interval in which the power supply voltage rises from a zero crossing point.

Optionally, the first interval is a 0.5ms interval in which the power supply voltage decreases from a zero crossing point.

Optionally, the first interval is an interval of 0.5ms after a zero crossing of the supply current.

In another aspect, the present invention provides a power line-based communication apparatus, including:

a control device provided on the power line, a load control device provided on the load;

data are transmitted and received between the control device and the load control device through a power line;

the control device comprises a first voltage detection component arranged on the power line and used for detecting voltage change, a voltage setting component arranged on the power line and used for changing the actual voltage of the load power supply voltage, and a first control component used for controlling the action of the voltage setting component;

the first control means drives the voltage setting means to change the effective voltage of the load power supply voltage based on the data value transmitted to the load control device;

the load control device includes a second voltage detection means provided on the power line for detecting a change in the power supply voltage, and a second voltage detection means for determining an effective value of the power supply voltage based on detected voltage data transmitted from the control device.

Optionally, the control means transmits one bit of data per cycle.

Alternatively, the first control means may determine a zero-cross point of the power supply voltage at which the effective voltage of the power supply voltage is changed by the voltage setting means, based on the detected voltage by the first voltage detecting means.

Optionally, the load control device comprises a power supply means for driving an input power supply of a load;

the power supply member cuts off a power supply current of the load power supply through the power line in a first section of one cycle of the load power supply;

the load control device further comprises a pulse generating means for generating a current pulse in a first interval;

the second control means drives the drive pulse generating means based on the data value transmitted to the control device;

the control device further comprises current detection means for detecting the supply current, the first control means receiving data sent by the load control device by detecting current pulses in a first interval.

Optionally, the first interval is 0.5ms before the zero-crossing point of the power supply current.

Optionally, the first interval is 0.5ms after the zero crossing point of the power supply current.

Optionally, the control device comprises communication means for communicating with the outside.

In another aspect, the present invention further provides a communication device based on a power line, which includes: a control device provided on the power line, a load control device provided on the load;

the control device comprises a first voltage detection component arranged on the power line and used for detecting voltage change, a voltage cut-off component arranged on the power line and used for cutting off load voltage, and a first control component used for controlling the action of the voltage cut-off component;

the first control means selectively drives the voltage cutoff means based on the data value transmitted to the load control means;

the load control device includes a second voltage detection means provided on the power line for detecting a voltage change, and a second control means for receiving data transmitted from the control device based on the voltage detected by the second voltage detection means.

Alternatively, the control means selectively drives the voltage cut-off member in a first section of one cycle of the power supply voltage.

Optionally, the first interval is a 0.5ms interval in which the power supply current decreases from the zero crossing point.

Alternatively, the control device selectively drives the power supply cutoff member, and the power supply voltage starts rising from the zero-cross point in the first section and the power supply current starts falling at the zero-cross point in the second section.

the power supply member cuts off a power supply current of the load power supply through the power line in a third or fourth section of one cycle of the load power supply;

the load control device further comprises a pulse generating means for generating a current pulse in the third or fourth interval;

the control device further comprises current detection means for detecting the supply current, the first control means receiving data sent by the load control device by detecting a current pulse in a third or fourth interval.

Optionally, the third interval is 0.5ms after the zero crossing point of the power supply current.

Optionally, the fourth interval is 0.5ms before the zero-crossing point of the power supply current.

In addition, the invention also provides an LED lighting system, which has the technical key points that:

one or more control devices connected to a commercial power supply via a power line, one or more LED lighting devices connected to the respective control devices via a power line, and a management device communicating with the control devices;

the control device and the LED lighting device receive and transmit data through a power line;

the data communication from the control device to the LED lighting device is realized by a broadcasting method, and the data communication from the LED lighting device to the control device is realized by a polling method.

Optionally, the LED lighting device comprises more than one group code (ID), and the control device transmits the dimming data to the LED lighting device through the group code (ID).

The LED lighting system includes a lighting system including control device 200 and LED lighting device 300 provided on power line 500. Therefore, the technical solution of the present invention can be realized by using the wiring of the existing lighting system. In addition, in the lighting system, the user can realize very stable dimming control on all the LED lighting devices 300 through the management device 400, and the management process is greatly simplified. In conclusion, the invention has extremely high market application prospect.

Drawings

The present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of the basic concept of the present invention;

fig. 2 is a first principle schematic diagram of a downlink data transmission method;

fig. 3 is a second principle diagram of a downlink data transmission method;

FIG. 4 is a schematic diagram of a method for uplink data transmission;

FIG. 5 is a first structural schematic diagram of the control device 10 in FIG. 1;

FIG. 6 is a schematic circuit diagram of the voltage setting means 15 in FIG. 5;

FIG. 7 is a second structural schematic diagram of the control device 10 in FIG. 1;

FIG. 8 is a schematic circuit diagram of the power cutoff member 71 in FIG. 7;

FIG. 9 is a schematic structural view of the load control member 20 of FIG. 1;

FIG. 10 is a schematic structural diagram of an LED lighting device according to the present invention;

FIG. 11 is a schematic diagram of a system configuration of an LED lighting device according to the present invention;

fig. 12 is a schematic diagram illustrating a data transmission and reception method between the control device 20 and the LED lighting device 300 in fig. 11.

Description of the symbols:

1 commercial power supply, 2 loads, 3 power lines, 10 control device, 11 communication means, 12 control means, 13 voltage detection means, 14 current detection means, 15 voltage setting means, 20 load control means, 21 rectification means, 22 switching power supply, 23 voltage detection means, 24 pulse generation means, 25 control means, 26 LED module, 28 transistor, 29 LED drive device, 71 power supply cutoff means, 72 control means, 100 input power supply, 151 primary coil, 152 secondary coil, 153 triac, 200 control device, MOS 241 transistor, 300 LED lighting device, 400 management device, 500 power lines, triac, 712 relay switch.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments thereof, with reference to the accompanying drawings. However, the following examples are only preferred embodiments of the present invention and are not exhaustive, and do not limit the scope of the claims. The non-inventive modifications of the present invention, which would be obvious to those of ordinary skill in the art, are intended to be within the scope of the present invention.

Fig. 1 is a schematic diagram of the basic concept principle of the present invention. As shown in fig. 1, a load 2 is electrically connected to a commercial power source 1 through a power line 3. If there are a plurality of loads 2, each load 2 is connected in parallel to the power line 3. The control device 10 is provided at one end of the commercial power supply 1. The load 2 is provided with a control means 20 for controlling the operation of the load 2. The control member 20 is connected to the control device 10 through a power line.

The control device 10 may include a user interface for use by an administrator or other management device, with communication being accomplished via wired or wireless communication means. The control device 10 generates control data for controlling the operation of the load 2, and then transmits the control data to the load control member 20 through the power line 3. When the load control means 20 receives control data from the power line 3, the driving load 2 operates.

Further, the load control means 20 generates appropriate corresponding data (such as confirmation data or the like), and then transmits it to the control device 10 through the power line. Wherein an uplink for transmitting data is not necessary but can be selectively applied.

For the transmission method of downlink data from the control device 10 to the load control device 20, the following two methods can be adopted:

the first method comprises the following steps: the maximum voltage value or the effective voltage value of the load power voltage in one cycle is set to different values according to whether the data transmitted to the load 2 is "0" or "1".

The second method comprises the following steps: a certain interval within one cycle of the load power supply 2 is set as a data interval, and the power supply voltage of the data interval is selectively set to a low Level (Level), for example, to "0", in accordance with whether data transmitted to the load 2 is "0" or "1".

Fig. 2 is a waveform diagram of the power supply voltage of the load 2 when the first method is adopted. Fig. 2b is a schematic diagram of the first power voltage D1 and the second power voltage D2.

In the case where the periods and phases of the first power supply voltage D1 and the second power supply voltage D2 are the same, the maximum value or the effective voltage value is set to different values. The maximum value of the first power voltage D1 is set to 220V, the second power voltage D2 is set to 200V, i.e., the difference V0 between the first power voltage D1 and the maximum value of the second power voltage D2 is 20V. (about 10% of the maximum value of the first power supply voltage D1) of course, in practical applications, the maximum values of the first power supply voltage D1 and the second power supply voltage D2 are not limited to specific values. In addition, considering the effective voltage values, since the first voltage D1 is an alternating current of 220V and the second voltage D2 is an alternating current of 200V, the effective voltage value of the first power voltage D1 is about 311V and the effective voltage value of the second power voltage D2 is about 283V.

As shown in fig. 1, in this method, if the control device 10 supplies the first power supply voltage D1 to the load 2 in an idle state (hereinafter, referred to as an idle state) which is a state where no data is transferred, when the control device 10 transmits data to the load 2, the second power supply voltage D2 is set as data "1" and the first power supply voltage D1 is set as data "0"; if the control device 10 supplies the second power voltage D2 to the load 2 in the idle state, the first power voltage is set as data "1" and the second power voltage D2 is set as data "0" when the control device 10 transmits data to the load 2.

Fig. 2b is a schematic diagram of the power supply voltage waveform supplied to the load 2 by the control device 10, and when the first power supply voltage D1 is data "1" and the second power supply voltage D2 is data "0", the control device 10 transmits control data "10110" to the load 2.

Typically, in the above method, the power supply transmits one bit (bit) of data per cycle. A power supply may send multiple data per cycle if there are multiple maximum or voltage valid values within one cycle of the power supply. The second method is a method of setting a certain interval in one cycle of the power supply as a data interval. An appropriate data interval for transmitting data is preferably selected, and the data interval may be arbitrarily set within the interval shown in fig. 3a, for example, an interval a where the power supply voltage rises from the zero-cross point, and an interval B where the power supply voltage falls from the zero-cross point.

Fig. 3b is a schematic voltage waveform of the power supply of the load 2 in the case of transmitting one bit of data, i.e., transmitting data "0" or "1" in the a interval. FIG. 3b is a diagram illustrating a third power voltage D3 and a fourth power voltage D4. The third power supply voltage D3 is the same as the normal power supply voltage. In this regard, the fourth power voltage D4 is identical to the third power voltage D3 in terms of time period and phase, and the power voltage rises from the zero crossing point in a certain interval of one power period, i.e., the data interval T1 is low, e.g., set to "0" level. At this time, 0.5ms after the zero cross point is set as the data interval T1. The length of the data interval T1 may be changed as appropriate according to the actual situation.

In the data interval T1, the voltage level is selectively set to the "0" level according to whether the data transmitted to the load 2 is "0" or "1". If the control device 10 in fig. 1 supplies the third power voltage D3 to the load 2 in the idle state, the fourth power voltage D4 is set as data "1" and the third power voltage D3 is set as data "0" when the control device 10 transmits data to the load 2.

Fig. 3c is a schematic diagram of the power supply voltage waveform when the control device 10 sends the control data "10110" to the load 2, similarly to fig. 2 b.

Fig. 3d is a voltage waveform diagram of the power supply of the load 2 when one bit of data is transmitted in the B interval, that is, data "0" or "1" is transmitted. I.e. the interval in which the zero crossing of the supply voltage drops. FIG. 3D is a diagram illustrating a fifth power voltage D5 and a sixth power voltage D6. The fifth power supply voltage D5 is the same as the normal power supply voltage. In this regard, the sixth power supply voltage D6 is identical to the fifth power supply voltage D5 in terms of time period and phase, and the power supply voltage falls from the zero cross point in a certain section of one power supply period, i.e., the data section T2 is low, e.g., set to "0" level. At this time, 0.5ms after the zero cross point is set as the data interval T2. The length of the data interval T2 may be changed as appropriate according to the actual situation.

In the data interval T2, the voltage level is selectively set to the "0" level according to whether the data transmitted to the load 2 is "0" or "1". If the control device 10 in fig. 1 supplies the fifth power voltage D5 to the load 2 in the idle state, the sixth power voltage D6 is set as data "1" and the fifth power voltage D5 is set as data "0" when the control device 10 transmits data to the load 2.

Fig. 3c is a schematic diagram of a power supply voltage waveform when the control device 10 sends control data "10110" to the load 2 according to one embodiment of the present invention.

In another embodiment of the present invention, data "1" and "0" are transmitted through the a and B intervals of fig. 3a, respectively. For example, if the normal power supply voltage is supplied to the load 2 in the idle state control device 10, when data "1" is transmitted in transmitting data to the load 2, the a section of the power supply voltage is set as data "1", and when data "0" is transmitted, the B section of the power supply voltage is set as data "0".

Fig. 3f is a schematic diagram of a power supply voltage waveform when the control device 10 sends control data "10110" to the load 2 according to an embodiment of the present invention.

In this case, the following method may be employed: when data "1" is transmitted, the B section is set to "0" level, and when data "0" is transmitted, the a section is set to "0" level.

In the method of fig. 3 as described above, the case where the power supply voltage transmits one bit of data per cycle has been described. Two bits of data may also be transferred by transferring one bit of data to the a section and the B section, respectively, at each cycle of the power supply voltage in the following method.

Hereinafter, the data transmission method of the load control means 20 of the load 2 side to the control device 10 uplink will be further described.

In fig. 1, a commercial power supply 1 connected to a load 2 side is used as a driving power supply. At this time, in order to supply the driving current to the load 2, the load 2 needs to be electrically coupled to the commercial power source 1. If the load 2 driving power line is open, the electrical coupling contact between the commercial power source 1 and the load 2 cuts off the driving current supplied from the commercial power source 1 to the load 2.

In the present invention, the load control member 20 transmits data to the control device 10 by means of a driving current between the on-off control device 10 and the load control member 20. At this time, the section in which the drive current is turned on and off is predetermined between the control device 10 and the load control member 20. In the following embodiments, the uplink data section in which data is transmitted to the control device 10 by the load control means 20 is set to a specific section within one cycle of the power supply voltage. Preferably, the 0.5ms interval starting from the zero crossing of the supply voltage is selected.

In this way, the uplink data interval is set to an interval in which the power supply voltage decreases from the zero-crossing point, so as to avoid the downlink data intervals T1 and T2 from overlapping with the uplink data interval when the control device 10 simultaneously transmits downlink data and uplink data to the load control member 20 in the second method. If control data is transmitted to the load control means 20 by the control device 10 based on the first method, the data zones T1 and T2 in fig. 3 may be used as uplink data zones.

Also, in this case, the downlink data transmission and the uplink data transmission are set to different power supply voltages, and the data intervals T1 and T2 in fig. 3 can be used as intervals of uplink data.

The data transmission method using the uplink data section is preferentially used, and the downlink data transmission method is the same, and the current value of the uplink data section is optionally set to a low level, for example, a "0" level, based on whether the data transmitted from the load control means 20 to the control device 10 is "0" or "1".

In the preferred embodiment shown in fig. 4a, the current value of the driving current of the load 2 is set to "0" level in the uplink data interval T3, and the current pulse P is inserted in the uplink data interval T3 according to whether the data transmitted to the control device 10 by the load control means 20 is "0" or "1" as shown in fig. 4 b.

Fig. 4c is a schematic diagram of a driving current waveform from the commercial power source 1 to the load 2 when the load control means 20 responds to the data "10110" to the control device 10 by inserting the uplink data interval T3 into the pulse P defining data "1".

In addition, in another embodiment of the present invention, as shown in fig. 4d, the uplink interval T4 is a 1ms interval including a 0.5ms interval in which the power supply voltage decreases from the zero cross point in the first direction and a 0.5ms interval in which the power supply voltage increases from the zero cross point in the second direction. The data transmitted by the load control member 20 is stably recognized by the control device 10.

In the embodiment shown in fig. 4a to 4d, the interval starting from the zero-crossing point of the power supply voltage and falling is the uplink data interval. Therefore, the data transfer amount of one cycle of the power source is one bit. In another embodiment of the present invention, the uplink data interval as shown in fig. 4e includes an interval T3 where the power supply current starts to decrease from the zero-crossing point first direction and an interval T5 where the power supply voltage rises from the zero-crossing point first direction. In the present embodiment, the power supply current transfers data through two intervals per cycle, and thus the data transfer amount per cycle is two bits.

The data transmitting and receiving method of the data transmitting and receiving device will be further described below. For convenience of illustration, the first method in fig. 2 and the second methods in fig. 3b and 3c are adopted to realize the transmission of downlink data; the transmission of uplink data is achieved using the methods in fig. 4b and 4 c.

Fig. 5 is a schematic structural diagram of the control device 10 according to the first embodiment of the present invention. According to the first method of fig. 2a and 2b, the value of the effective voltage of the power supply supplied to the load 2 is set to a different value, i.e. "0" or "1", every cycle.

The control device 10 is optionally provided with a communication means 11, the communication means 11 being a user interface available to the administrator or communicating with other administration devices via wired or wireless communication means. Upon receiving a control instruction from the communication means 11, data communication is made with the load 2 through the control means 12, and the load 2 is driven by the load control means 20. The control means 12 may employ a microprocessor.

As shown in fig. 5, the voltage detection means 13, the current detection means 14, and the voltage setting means 15 are connected to the power line 3. The voltage detection means 13 detects the power supply voltage of the load 2 and supplies it to the control means 12. The maximum value of the power supply voltage of the load 2 is 220V, and the control means 12 cannot directly detect the change of the power supply voltage. The voltage detecting means 13 (not described in detail in the drawings) includes a resistance voltage divider circuit, and divides the voltage of 5V of the commercial power source 1 and inputs it to the control means 12. The control means 12 can determine the zero-crossing point, the data section of the downlink, and the data section of the uplink, based on the change in the input voltage detected by the voltage detection means 13.

The current detection means 14 is for receiving uplink data transmitted by the load control means 20 to the control device 10. The current detection means 14 includes a current transformer provided on the power line 3, a rectifier circuit (such as a bridge rectifier circuit) for outputting a current from the current transformer, and a resistor divider circuit connected to an output terminal of the rectifier circuit. The current detection means 14 inputs a voltage level corresponding to the current value to the load 2 through the power line 3. Since the current detection means 14 does not need to have a specific structure, it is not shown.

The voltage setting means 15 is used to transmit data to the load control means 20. The voltage setting means 15 changes the power supply voltage of the load 2 according to the gate control signal of the control means 12.

Fig. 6 is a circuit diagram of one of the structures of the voltage setting means 15. As shown in fig. 6, the voltage setting member 15 includes a primary coil 151 provided at one end of the power line 3, and a secondary coil 152 provided at one end of the power line 3, the secondary coil 152 being connectable to the other end of the power line 3 through the switching member 15. Preferably, the switching member 53 comprises a Triac.

In the configuration of fig. 6, when the triac 153 is turned off, the secondary coil 152 is in an open state with respect to the power line 3, and V1 and V2 have the same value. Similarly, when the triac 153 is turned on, the secondary winding 152 is electrically connected to the power line 3. In this case, when the number of turns of the primary coil 151 is N1 and the number of turns of the secondary coil is N2, V2 can be obtained by formula (1).

Formula (1): v2= V1 × N1/N2.

In this embodiment, when the triac 153 is turned on, V2 is set to V1 of less than 10% by setting appropriate N2 and N1.

In fig. 5, when the control data is transmitted to the load 2 based on the communication means 11, the control means 12 outputs an appropriate gate signal G1 based on the data value, and turns on/off the triac 153 of the voltage setting means 15. Preferably, the on/off of the triac 153 is performed at the power supply voltage zero crossing time. And the control means 12 detects the input voltage from the current detection means 14 corresponding to the uplink data interval T3 in fig. 4 and determines whether the uplink data is from the load 2. The control device 10 realizes data transmission and reception of the load 2 through the above-described procedure.

Fig. 7 is a block diagram of the control device 10 according to embodiment 2 of the present invention. The structure of the control device 10 in the second method shown in fig. 3a and 3b will be described in detail below with reference to fig. 7. A specific interval within one cycle of the power supply of the load 2 is set as a data interval, and the power supply voltage of the data interval may be set to a low level "0" according to data "0" or "1" transmitted to the load 2. Fig. 7 is basically the same as fig. 5 in structure, and will not be described in detail.

The control device 10 of fig. 7 includes a power supply cutoff member 71 for replacing the voltage setting member 15. The power supply cutoff member 71 provided on the power line 3 cuts off the power supply voltage of the load 2 in accordance with the gate control signals G2 and G3 of the control member 72. When transmitting data to the load 2, the control means 72 transmits gating signals G2 and G3 corresponding to the downlink T1 data interval in fig. 3 to the power cut-off means 71.

Fig. 8 is a schematic diagram of one circuit structure of the power cutoff member 71. The first switching means for cutting off the power line 3 may employ a triac 711 connected in series to one end of the power line 3, and the second switching means may employ a relay switch 712 connected in parallel to one end of the power line 3. The triac 711 and the relay switch 712 are turned on/off by the gate control signals G2 and G3.

In the above configuration, when no data is transmitted to the load 2 (in the idle state), the control member 72 sets the relay switch 712 to the ON (ON) state and sets the triac 711 to the OFF (OFF) state. In this case, the commercial power source 1 as a driving power source supplies power to the load 2 through the relay switch 712.

ON the other hand, when data is transmitted to the load 2, the control member 72 sends a gate control signal G3, the triac 711 is set to an ON (ON) state, and the relay switch 712 is set to an OFF (OFF) state. In this case, the commercial power supply 1 as a driving power supply supplies power to the load 2 through the triac 711.

And, the control means 72 transmits control data to the load 2 through the power line 3, and realizes on/off of the triac 711 corresponding to the downlink data interval T1 in fig. 3. When the data transfer is completed, the control member 72 controls the relay switch 712 to be turned on and the triac 711 to be turned off, so that the power shutoff member 71 is in the idle state. Other operations, such as data reception of the load 2, are substantially the same as those in fig. 5.

Fig. 9 is a schematic view of the structure of one of the load control members 20 of the load 2. Normally, a rectifying member 21 and a switching power supply (SMPS)22 are provided on the load 2. Only when the switching power supply 22 has the configuration shown in fig. 4a, the current of the primary coil (not shown) is cut off in the uplink data interval T3, and the drive current from the commercial power supply 1 to the load 2 is set to "0".

In fig. 9, the front end of the rectifying member 21 is optionally connected to the voltage detecting member 23 through the power line 3. The voltage detection member 23 includes a resistor R1 and a resistor R2 provided on the power line 3, a resistor R3 provided between the coupling nodes of the resistors R1 and R2, and a signal ground. Resistor R1 and resistor R2 are coupled at a node and are connectable to an analog input of control means 25. The voltage detection means 23 (similar in structure to the voltage detection means 13 in fig. 5) converts the commercial power source 1 from the power line to a divided voltage of 5V or less, and supplies power to the control means 25. The voltage detection member 23 is provided at the front end of the rectifying member 21 for the purpose of: the load 2 minimizes the voltage change detected by the voltage detection means 23 in the use state.

The power line 3 is provided with a pulse generating member 24. The pulse generating means 24 may employ a MOS transistor 241 including a resistor R4 connected in series between the power line 3 and the signal ground.

The control means 25 may employ a microprocessor. Based on the change in the detected voltage detected by the voltage detecting means 23, the control means 25 can identify the zero-cross point, the downlink data section, and the uplink data section of the commercial power supply. Further, the control means 25 can recognize control data from the control device 10 based on the input voltage of the voltage detection means 23.

The control means 25 is controlled by a program, and the control means 25 compiles appropriate control software according to the configuration of the control device 10. When the control means 25 shown in fig. 5 cooperates with the control device 10, the control means 25 determines whether the voltage input by the power line 3 is the first power supply voltage D1 or the second power supply voltage D2 in fig. 2 a. In this case, the control means 25 discriminates the magnitude of the power supply voltage by a method of detecting the maximum value of the power supply voltage in one cycle or by a method of calculating the effective value of the power supply voltage in one cycle. As described above, when the first power voltage D1 is ac 220V and the second power voltage D2 is ac 200V, the effective voltage of the first power voltage D1 is about 311V and the effective voltage of the second power voltage D2 is about 283V.

When the control means 25 shown in fig. 7 cooperates with the control device 10, the control means 25 determines whether the voltage input by the power line 3 is the third power supply voltage D3 or the fourth power supply voltage D4 in fig. 3 a. In this case, the control means 25 samples the input voltage from the voltage detection means 23, for example, at intervals of 100 microseconds (μ s) in the downlink data interval T1, to distinguish whether the power supply voltage at this time is the third power supply voltage D3 or the fourth power supply voltage D4.

And, when transmitting data to the control device 10, the control means 25 generates the current pulse P, for example, a pulse of 0.2ms, by controlling the MOS transistor 241 of the pulse generating means 24 at the uplink data section T3 in fig. 4. When the current detection means 14 detects the current pulse P shown in fig. 5 and 7, it is input to the control means 12 of the control device 10.

Fig. 10 is a schematic view of one structure of the load control member 20 for the LED lighting device of fig. 9. Fig. 10 is substantially the same as fig. 9, and therefore, will not be described in detail.

In fig. 10, one end of the LED Module (Module) 26 is connected to the voltage output terminal of the switching power supply 22, and the other end of the LED Module (Module) 26 is connected to the signal ground through the transistor 28 for cutting off the driving current of the LED Module 26 and the resistor R5 for detecting the driving current of the LED Module 26.

Reference numeral 29 in fig. 10 is an LED driving device of the LED module 26. The GD terminal of the LED driver 29 is connected to the gate transistor 28, and the CS terminal of the LED driver 29 is connected to a connection node between the transistor 28 and the resistor R5.

When receiving control data for dimming-controlling the LED lighting device from the control device 10, the control means receives the control data through the voltage detection unit 23, and then generates a pulse width modulation signal (hereinafter, PWM signal) for dimming-controlling the LED driving device 29. The LED driving device 29 changes a PWM signal through a dimming control DIM terminal in a digital-to-analog conversion (hereinafter, referred to as D/a conversion) manner and then generates a reference voltage corresponding to the PWM signal. The LED driving device 29 effectively controls the driving current of the LED module 26 by controlling the on/off of the transistor 28 such that the voltage inputted through the CS terminal is the same as the reference voltage. The LED driver 29 sets an appropriate feedback voltage (hereinafter, VF) for the switching power supply 22, thereby controlling the output of the switching power supply 22 to match the dimming level at that time.

Further, the control means 25 drives the pulse generating means 24 to send a response signal to the control device 10.

Fig. 11 is a block diagram of a system structure of the LED lighting device of the present invention. A plurality of control devices 200-1 to 200-n are connected to a commercial power supply 100 via a power line 500. And the plurality of LED lighting devices 3001-1 to 3001-N, 300N-1 to 300N-N are connected with the control devices 200-1 to 200-N through the power line 500.

The control device 200 has substantially the same structure as the control device 10 in fig. 5 or 7. The LED lighting device 300 has the same structure as that shown in fig. 10.

The management apparatus 400 is mainly used for a manager. The management device 400 communicates data with the control device 200. The manager may control the lighting device 300 through the management device 400.

The LED lighting device 300 is divided into an inherent code (ID) and a group code (ID). If there are a plurality of codes (IDs), dimming control of the LED lighting device 300 is implemented by the group code (ID). In this case, the LED lighting device 300 using the Group ID can realize different lighting effects.

When the manager performs the dimming control through the management device 400, a corresponding control command is transmitted to the control device 200, and the control device 200 generates control data corresponding to the control command and then transmits the control data through the power line 500. The transmission of control data can be achieved by a broadcast method, which, if employed, requires the introduction of a personal or group code (ID) to define the delivery address of the corresponding data.

Fig. 12 is a schematic diagram of one data format of data transmission and reception between the control device 200 and the LED lighting device 300. As shown in fig. 12, the data format of the transceiving may be a one-bit start bit, four-bit data bits and a one-bit format frame bit, where the four-bit data bits are reset bits.

In the case where the LED lighting device 300 needs to return response data to the control device 100 through the power line 500. As described above, the response data return is realized by cutting off the power supply voltage from the control device 200 to the LED lighting device 300. When a plurality of ED lighting devices 300 transmit back response data at the same time, in order to avoid data collision, the transmission of uplink data from the LED lighting devices 300 to the control device 200 is performed in a polling manner.

When all the LED lighting devices 300 receive the transmitted control data and return the response data, the control device 100 completes the response to the control command of the management device 400. The control device 200 may transmit response data to the management device 400 to report completion of the control instruction execution, if necessary.

Possibility of industrial application: the LED lighting system can be configured by the control device 200 and the LED lighting device 300 provided on the power line 500. Therefore, even if the conventional lighting wiring is used, the LED lighting system can be easily realized. In addition, in the above system, the management device 400 can stably control the dimming of the entire LED lighting device 300, which is greatly convenient for the daily work of the manager.

Claims

1. A power line based communication device, comprising:

the control device and the load control device receive and transmit data through a power line;

the control device includes: first data transmission means for transmitting data by the load control device in a first data interval, first data reception means for receiving data by the load control device in a second data interval;

the load control device includes: a second data receiving and transmitting means for receiving data transmitted from the control device in a first data interval, and a second data transmitting means for transmitting data to the control device in a second data interval;

the first data interval includes at least: one of a first interval in which a power supply current starts to rise from a zero-cross point, a second interval in which the power supply current starts to fall from the zero-cross point, a third interval in which the power supply current rises to the zero-cross point, and a fourth interval in which the power supply current starts to fall from the zero-cross point;

the second data interval includes: at least one of the first interval, the second interval, the third interval and the fourth interval which is not selected by the first data interval;

the first data transfer means is set to: setting the power supply voltage level supplied by the load control device to be 0 according to the data transmitted by the load control device;

the second data transmission mechanism is used for selectively forming current pulses by the current flowing from the control device to the load control device according to the data transmitted by the control device;

the control device further includes: a communication means for communicating with the outside;

the first data transfer means comprises: a first voltage detection means for detecting a voltage change on the power line, a voltage cutoff means for cutting off a load voltage provided on the power line, and a first control means for controlling an operation of the voltage cutoff means;

the first data receiving means further comprises: current detection means for detecting a power supply current;

the first control means selectively driving the voltage cut-off means in a first data interval based on the data value transmitted to the load control means, the second data interval receiving data transmitted by the load control device by detecting a current pulse;

the second data receiving means further comprises: second voltage detection means for detecting a voltage change on the power line and second control means for receiving data transmitted to the control device based on the second voltage detection means detected voltage in the first data section;

the second data transfer means further comprises: a power supply means for driving an input power supply of the load and cutting off a power supply current of the load power supply in the second data section through the power line; a pulse generating means provided on the power line for controlling generation of a current pulse based on the second control means; the second control means drives the pulse generating means in the second data interval based on the data value transmitted to the control device.

2. The power-line based communication device of claim 1, wherein: the first interval, the second interval, the third interval and the fourth interval are 0.5ms intervals before or after the power supply voltage is taken as a reference from a zero crossing point.

3. An LED lighting system, comprising:

the control device includes: a first data transmitting means for transmitting data through the LED lighting device in a first data interval and a first data receiving means for receiving data through the LED lighting device in a second data interval;

the LED lighting device includes: a second data receiving and transmitting means for receiving data transmitted from the control device in a first data interval and a second data transmitting means for transmitting data to the control device in a second data interval;

the first data transfer means is set to set a level of a power supply voltage supplied from the load control device to be selected to be "0" in accordance with data transferred from the LED lighting device;

the second data transfer mechanism further comprises: selectively forming current pulses from current flowing from the control device to the load control device based on data communicated by the control device;

the LED lighting device comprises more than one group code, and the control device transmits dimming data to the LED lighting device through the group codes.