CN105282903B - Improved light-emitting diode driving system and light-emitting diode driving device - Google Patents

Abstract

The present invention discloses an improved light-emitting diode driving system and a light-emitting diode driving device, wherein the light-emitting diode driving system comprises a plurality of light-emitting diode driving devices and a transmission line; the transmission line is electrically connected to the plurality of light-emitting diode driving devices. The light-emitting diode driving device comprises a voltage regulator, a synchronization signal generating circuit and a synchronization control logic circuit. The voltage regulator transmits a first voltage to the synchronization signal generating circuit; after the synchronization signal generating circuit receives the first voltage, the synchronization signal generating circuit generates a second voltage; the synchronization signal generating circuit subtracts the second voltage from the first voltage to obtain a synchronization signal; the synchronization signal generating circuit transmits the synchronization signal to the synchronization control logic circuit; by means of the plurality of synchronization signals, the plurality of light-emitting diode driving devices synchronously drive the plurality of light-emitting diodes.

Description

Improved light-emitting diode drive system and light-emitting diode drive device

technical field

The invention relates to a light emitting diode driving system and a light emitting diode driving device, in particular to an improved light emitting diode driving system and a light emitting diode driving device.

Background technique

At present, LED light string modules can be roughly divided into two connection methods: serial connection and parallel connection, and these two types of LED light string modules are also widely used by users on building exteriors, trees, signboards and landscaping objects. To increase the appearance beauty of such things.

In the existing serial LED light string module, multiple groups of LED light string modules are connected in series, and the number of series LED light string modules is determined according to the volume of the coiled object, and in the series connection Afterwards, the controller of the first LED light string module controls the LED light groups of all the LED light string modules.

Although this kind of series connection makes it easy to use the LED light string modules in series, but in the process of use, as long as a group of LED light string modules fails, the control signal will not be transmitted, resulting in the failure of the group of light emitting diodes. The LED light string modules at the back stage of the diode light string module cannot receive any control signal, so that none of the LED light string modules at the back stage can be turned on.

In addition, in the parallel-connected LED light string module, multiple groups of LED light string modules are connected in parallel with the controller, and each LED light string module must have a control line and an address line for control. If 10 groups of LED light string modules are connected in parallel, the controller must use 10 control lines and 10 addressing lines to control 10 groups of LED light string modules.

When this kind of parallel connection is in use, when a group of LED light string modules fails, it will not affect the control of other LED light string modules. However, when the number of LED light string modules connected in parallel increases, there are relatively more control lines and addressing lines, resulting in complicated wiring, difficult fabrication, and high cost.

However, regardless of the serial or parallel signal mode, multiple power lines or signal lines are required to achieve the purpose of changing the light emitted by the LED light string module. In today's situation where raw materials are rising day by day, reducing the use of transmission lines can greatly reduce costs.

Contents of the invention

In order to improve the above-mentioned shortcomings of the prior art, the object of the present invention is to provide an improved LED driving system and LED driving device.

In order to achieve the above object of the present invention, the present invention provides an improved LED driving system, which is applied to an AC power supply device, a rectification filter circuit and a plurality of LEDs, and the AC power supply device is electrically connected to the rectification filter circuit. Circuit, the improved LED driving system is electrically connected to the rectification and filtering circuit and the plurality of LEDs, the improved LED driving system includes:

a plurality of light emitting diode driving devices, the plurality of light emitting diode driving devices are electrically connected to the rectification and filtering circuit and the plurality of light emitting diodes, and the plurality of light emitting diode driving devices are connected in series; and

a transmission line, the transmission line is electrically connected to the rectification and filtering circuit and the plurality of LED driving devices,

Wherein the LED driving device includes:

a positive terminal of a power supply, the positive terminal of the power supply is electrically connected to the rectification and filtering circuit and the transmission line;

a voltage regulator electrically connected to the positive terminal of the power supply;

a negative terminal of a power supply, the negative terminal of the power supply is electrically connected to the voltage regulator;

a synchronous signal generating circuit electrically connected to the voltage regulator; and

a synchronous control logic circuit, the synchronous control logic circuit is electrically connected to the voltage regulator and the synchronous signal generating circuit,

Wherein the AC power supply device transmits an AC power to the rectifying and filtering circuit; the rectifying and filtering circuit rectifies and filters the AC power to obtain a DC power; the rectifying and filtering circuit transmits the DC power to the voltage regulator;

After the voltage regulator receives the DC power supply, the voltage regulator generates a first voltage; after the voltage regulator generates the first voltage, the voltage regulator transmits the DC power supply to the next LED drive device; the voltage After the regulator generates the first voltage, the voltage regulator transmits the first voltage to the synchronization signal generating circuit;

After the synchronous signal generating circuit receives the first voltage, the synchronous signal generating circuit generates a second voltage; the synchronous signal generating circuit subtracts the second voltage from the first voltage to obtain a synchronous signal; the synchronous signal generates The circuit transmits the synchronous signal to the synchronous control logic circuit; through the synchronous signals, the plurality of LED driving devices synchronously drive the plurality of LEDs.

Further, wherein the synchronous signal generating circuit includes:

a constant voltage generator electrically connected to the voltage regulator;

a voltage subtractor electrically connected to the voltage regulator and the constant voltage generator; and

A signal filter, the signal filter is electrically connected to the voltage regulator, the constant voltage generator, the voltage subtractor and the synchronous control logic circuit.

Further, wherein the LED drive device also includes:

A luminescence variation control circuit, the luminescence variation control circuit is electrically connected to the voltage regulator and the synchronous control logic circuit;

an oscillator electrically connected to the voltage regulator, the synchronous control logic circuit and the light emission variation control circuit;

a driving current control circuit, the driving current control circuit is electrically connected to the voltage regulator and the light emission variation control circuit; and

A plurality of driving current output circuits, the plurality of driving current output circuits are electrically connected to the driving current control circuit and the plurality of light emitting diodes.

The present invention also provides a light-emitting diode driving device, which is applied to an AC power supply device and a rectifying and filtering circuit. The AC power supply device is electrically connected to the rectifying and filtering circuit, and the LED driving device is electrically connected to the rectifying and filtering circuit. circuit, the LED driver includes:

a positive terminal of a power supply, the positive terminal of the power supply is electrically connected to the rectification and filtering circuit;

a voltage regulator electrically connected to the positive terminal of the power supply;

a negative terminal of a power supply, the negative terminal of the power supply is electrically connected to the voltage regulator;

a synchronous signal generating circuit, the synchronous signal generating circuit is electrically connected to the voltage regulator;

a synchronous control logic circuit electrically connected to the voltage regulator and the synchronous signal generating circuit; and

at least one light emitting diode, the light emitting diode is electrically connected to the synchronous control logic circuit,

Wherein a plurality of light-emitting diode driving devices are connected in series; the AC power supply device transmits an AC power to the rectifying and filtering circuit; the rectifying and filtering circuit rectifies and filters the AC power to obtain a DC power; the rectifying and filtering circuit transmits the DC power to the voltage regulator;

After the voltage regulator receives the DC power supply, the voltage regulator generates a first voltage; after the voltage regulator generates the first voltage, the voltage regulator transmits the DC power supply to the next LED drive device; the voltage After the regulator generates the first voltage, the voltage regulator transmits the first voltage to the synchronization signal generating circuit;

After the synchronous signal generating circuit receives the first voltage, the synchronous signal generating circuit generates a second voltage; the synchronous signal generating circuit subtracts the second voltage from the first voltage to obtain a synchronous signal; the synchronous signal generates The circuit transmits the synchronous signal to the synchronous control logic circuit; through the plurality of synchronous signals, the plurality of LED driving devices synchronously drives the at least one LED.

Further, wherein the synchronous signal generating circuit includes:

a constant voltage generator electrically connected to the voltage regulator;

a voltage subtractor electrically connected to the voltage regulator and the constant voltage generator; and

A signal filter, the signal filter is electrically connected to the voltage regulator, the constant voltage generator, the voltage subtractor and the synchronous control logic circuit.

Further, it also includes:

A luminescence variation control circuit, the luminescence variation control circuit is electrically connected to the voltage regulator and the synchronous control logic circuit;

an oscillator electrically connected to the voltage regulator, the synchronous control logic circuit and the light emission variation control circuit;

a driving current control circuit, the driving current control circuit is electrically connected to the voltage regulator and the light emission variation control circuit; and

A plurality of driving current output circuits, the plurality of driving current output circuits are electrically connected to the driving current control circuit and the at least one light emitting diode.

The present invention has the advantage that:

The advantage of the present invention is that the transmission lines of the LED driving system are reduced to reduce the cost of the LED driving system.

Description of drawings

FIG. 1 is a block diagram of an improved LED driving system of the present invention.

FIG. 2 is a block diagram of a synchronous signal generating circuit of the present invention.

FIG. 3 is a waveform diagram of an embodiment of the present invention (if the rectification and filtering circuit is a full-bridge structure).

FIG. 4 is a waveform diagram of another embodiment of the present invention (if the rectification and filtering circuit is a half-bridge structure).

FIG. 5 is a block diagram of the LED driving device of the present invention.

In the picture:

10 Improved LED drive system;

20 rectification filter circuit;

22 AC power supply;

24 DC power supply;

30 LEDs;

40 AC power supply device;

104 LED driving device;

106 transmission lines;

10402 positive terminal of power supply;

10404 voltage regulator;

10406 power supply negative terminal;

10408 synchronous signal generating circuit;

10410 synchronous control logic circuit;

10412 light change control circuit;

10414 oscillator;

10416 drive current control circuit;

10418 drive current output circuit;

10420 first voltage;

10422 second voltage;

10424 synchronization signal;

10426 constant voltage generator;

10428 voltage subtractor;

10430 signal filter.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

Please refer to FIG. 1 , which is a block diagram of an improved LED driving system provided by the present invention. An improved LED driving system 10 is applied to an AC power supply device 40 , a rectifying and filtering circuit 20 and a plurality of LEDs 30 . The AC power supply device 40 is electrically connected to the rectifying and filtering circuit 20 ; the improved LED driving system 10 is electrically connected to the rectifying and filtering circuit 20 and the plurality of LEDs 30 .

The improved LED driving system 10 includes a plurality of LED driving devices 104 and a transmission line 106 . The multiple LED driving devices 104 are electrically connected to the rectifying and filtering circuit 20 and the multiple LEDs 30; the multiple LED driving devices 104 are connected in series; the transmission line 106 is electrically connected to the rectifying and filtering circuit 20 and the multiple LEDs 30; A plurality of LED driving devices 104 .

The light emitting diode driving device 104 includes a power supply positive terminal 10402, a voltage regulator 10404, a power supply negative terminal 10406, a synchronous signal generating circuit 10408, a synchronous control logic circuit 10410, a light emission change control circuit 10412, and an oscillator 10414 1. A driving current control circuit 10416 and a plurality of driving current output circuits 10418 .

The positive terminal 10402 of the power supply is electrically connected to the rectifying and filtering circuit 20 and the transmission line 106; the voltage regulator 10404 is electrically connected to the positive terminal 10402 of the power supply; the negative terminal 10406 of the power supply is electrically connected to the voltage regulator 104004; The synchronous signal generating circuit 10408 is electrically connected to the voltage regulator 10404; the synchronous control logic circuit 10410 is electrically connected to the voltage regulator 10404 and the synchronous signal generating circuit 10408; the luminous change control circuit 10412 is electrically connected to the voltage Regulator 10404 and the synchronous control logic circuit 10410 .

The oscillator 10414 is electrically connected to the voltage regulator 10404, the synchronous control logic circuit 10410 and the light emission change control circuit 10412; the driving current control circuit 10416 is electrically connected to the voltage regulator 10404 and the light emission change control circuit 10412 the plurality of driving current output circuits 10418 are electrically connected to the driving current control circuit 10416 and the plurality of light emitting diodes 30 ;

The AC power supply device 40 transmits an AC power 22 to the rectifying and filtering circuit 20; the rectifying and filtering circuit 20 rectifies and filters the AC power 22 to obtain a DC power 24; the rectifying and filtering circuit 20 transmits the DC power 24 to the Voltage Regulator 10404.

After the voltage regulator 10404 receives the DC power supply 24, the voltage regulator 10404 generates a first voltage 10420; after the voltage regulator 10404 generates the first voltage 10420, the voltage regulator 10404 transmits the DC power supply 24 to the next LED driving device 104 ; after the voltage regulator 10404 generates the first voltage 10420 , the voltage regulator 10404 transmits the first voltage 10420 to the synchronous signal generating circuit 10408 .

After the synchronization signal generation circuit 10408 receives the first voltage 10420, the synchronization signal generation circuit 10408 generates a second voltage 10422; the synchronization signal generation circuit 10408 subtracts the second voltage 10422 from the first voltage 10420 to obtain a synchronization Signal 10424; the synchronous signal generation circuit 10408 transmits the synchronous signal 10424 to the synchronous control logic circuit 10410; by means of the plurality of synchronous signals 10424, the plurality of LED driving devices 104 drive the plurality of LEDs 30 synchronously.

The transmission line 106 transports the DC power supply 24, the voltage regulator 10404 generates the first voltage 10420 through the DC power supply 24, the synchronization signal generating circuit 10408 generates the second voltage 10422 through the first voltage 10420, and the synchronization signal The generating circuit 10408 generates the synchronous signal 10424 through the first voltage 10420 and the second voltage 10422 .

Therefore, the improved LED driving system 10 only uses the transmission line 106 to transmit the DC power source 24 and then generate the synchronous signal 10424 , reducing the transmission lines of the LED driving system and reducing the cost of the LED driving system.

Furthermore, the synchronous control logic circuit 10410 is used to perform some circuit logic control processing and notify the light emission change control circuit 10412; the light emission change control circuit 10412 is used to determine the light emission change of the plurality of LEDs 30 and notify the driver Current control circuit 10416 ; the driving current control circuit 10416 of each LED driving device 104 controls the driving current output circuit 10418 to drive the plurality of LEDs 30 synchronously. Therefore, all of the plurality of LEDs 30 are driven synchronously.

Furthermore, if the rectification and filtering circuit 20 is a half-bridge structure, the improved LED driving system 10 can save more transmission lines (compared with if the rectification and filtering circuit 20 is a full-bridge structure). The voltage regulator 10404 can be, for example but not limited to, a Zener diode. The LED 30 can be in the form of a chip and packaged together with the LED driving device 104 to form a single LED lamp.

Please refer to FIG. 2 , which is a block diagram of a synchronization signal generating circuit of the present invention. The synchronization signal generation circuit 10408 includes a constant voltage generator 10426 , a voltage subtractor 10428 and a signal filter 10430 . The constant voltage generator 10426 is electrically connected to the voltage regulator 10404; the voltage subtractor 10428 is electrically connected to the voltage regulator 10404 and the constant voltage generator 10426; the signal filter 10430 is electrically connected to the voltage regulator 10404, the constant voltage generator 10426, the voltage subtractor 10428 and the synchronous control logic circuit 10410.

The voltage regulator 10404 transmits the first voltage 10420 to the constant voltage generator 10426, the voltage subtractor 10428 and the signal filter 10430; after the constant voltage generator 10426 receives the first voltage 10420, the constant voltage generator 10426 generates the second voltage 10422 ; the constant voltage generator 10426 transmits the second voltage 10422 to the voltage subtractor 10428 .

After the voltage subtractor 10428 receives the first voltage 10420 and the second voltage 10422, the voltage subtractor 10428 subtracts the second voltage 10422 from the first voltage 10420 to obtain the synchronization signal 10424; the voltage subtractor 10428 transmits The synchronous signal 10424 is sent to the signal filter 10430; the signal filter 10430 filters out the noise of the synchronous signal 10424; then, the signal filter 10430 transmits the synchronous signal 10424 to the synchronous control logic circuit 10410; through the multiple Synchronous signal 10424, the plurality of LED driving devices 104 drive the plurality of LEDs 30 synchronously.

Please refer to Figure 3, which is a waveform diagram of one embodiment of the present invention (if the rectification and filtering circuit is a full bridge structure); please refer to Figure 4, which is a waveform diagram of another embodiment of the present invention (if the rectification and filtering circuit is a half bridge architecture).

After the voltage regulator 10404 receives the DC power supply 24, the voltage regulator 10404 generates the first voltage 10420; after the constant voltage generator 10426 receives the first voltage 10420, the constant voltage generator 10426 generates the second voltage 10422 After the voltage subtractor 10428 receives the first voltage 10420 and the second voltage 10422 , the voltage subtractor 10428 subtracts the second voltage 10422 from the first voltage 10420 to obtain the synchronization signal 10424 ;

Please refer to FIG. 5 , which is a block diagram of the LED driving device of the present invention. The description of the components shown in FIG. 5 is similar to those in FIGS. 1 to 4 , for the sake of brevity, and will not be repeated here. Furthermore, the LED driving device 104 further includes at least one LED 30 ; the LED 30 is electrically connected to the synchronous control logic circuit 10410 .

The advantage of the present invention is that the transmission lines of the LED driving system are reduced to reduce the cost of the LED driving system.

The above-mentioned embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention shall be determined by the claims.

Claims (6)

1. An improved light-emitting diode drive system, applied to an AC power supply device, a rectifier filter circuit and a plurality of light-emitting diodes, characterized in that the AC power supply device is electrically connected to the rectifier filter circuit, the improved The LED driving system is electrically connected to the rectifying and filtering circuit and the plurality of LEDs, and the improved LED driving system includes: a plurality of light emitting diode driving devices, the plurality of light emitting diode driving devices are electrically connected to the rectification and filtering circuit and the plurality of light emitting diodes, and the plurality of light emitting diode driving devices are connected in series; and a transmission line, the transmission line is electrically connected to the rectification and filtering circuit and the plurality of LED driving devices, Wherein the LED driving device includes: a positive terminal of a power supply, the positive terminal of the power supply is electrically connected to the rectification and filtering circuit and the transmission line; a voltage regulator electrically connected to the positive terminal of the power supply; a negative terminal of a power supply, the negative terminal of the power supply is electrically connected to the voltage regulator; a synchronous signal generating circuit electrically connected to the voltage regulator; and a synchronous control logic circuit, the synchronous control logic circuit is electrically connected to the voltage regulator and the synchronous signal generating circuit, Wherein the AC power supply device transmits an AC power to the rectifying and filtering circuit; the rectifying and filtering circuit rectifies and filters the AC power to obtain a DC power; the rectifying and filtering circuit transmits the DC power to the voltage regulator; After the voltage regulator receives the DC power supply, the voltage regulator generates a first voltage; after the voltage regulator generates the first voltage, the voltage regulator transmits the DC power supply to the next LED drive device; the voltage After the regulator generates the first voltage, the voltage regulator transmits the first voltage to the synchronization signal generating circuit; After the synchronous signal generating circuit receives the first voltage, the synchronous signal generating circuit generates a second voltage; the synchronous signal generating circuit subtracts the second voltage from the first voltage to obtain a synchronous signal; the synchronous signal generates The circuit transmits the synchronous signal to the synchronous control logic circuit; through the synchronous signals, the plurality of LED driving devices synchronously drive the plurality of LEDs. 2. The improved LED drive system according to claim 1, wherein the synchronous signal generating circuit comprises: a constant voltage generator electrically connected to the voltage regulator; a voltage subtractor electrically connected to the voltage regulator and the constant voltage generator; and A signal filter, the signal filter is electrically connected to the voltage regulator, the constant voltage generator, the voltage subtractor and the synchronous control logic circuit. 3. The improved LED driving system according to claim 2, wherein the LED driving device further comprises: A luminescence variation control circuit, the luminescence variation control circuit is electrically connected to the voltage regulator and the synchronous control logic circuit; an oscillator electrically connected to the voltage regulator, the synchronous control logic circuit and the light emission variation control circuit; a driving current control circuit, the driving current control circuit is electrically connected to the voltage regulator and the light emission variation control circuit; and A plurality of driving current output circuits, the plurality of driving current output circuits are electrically connected to the driving current control circuit and the plurality of light emitting diodes. 4. A light emitting diode driving device, which is applied to an AC power supply device and a rectifying and filtering circuit, characterized in that the AC power supply device is electrically connected to the rectifying and filtering circuit, and the light emitting diode driving device is electrically connected to the A rectification and filtering circuit, the light-emitting diode drive device includes: a positive terminal of a power supply, the positive terminal of the power supply is electrically connected to the rectification and filtering circuit; a voltage regulator electrically connected to the positive terminal of the power supply; a negative terminal of a power supply, the negative terminal of the power supply is electrically connected to the voltage regulator; a synchronous signal generating circuit, the synchronous signal generating circuit is electrically connected to the voltage regulator; a synchronous control logic circuit electrically connected to the voltage regulator and the synchronous signal generating circuit; and at least one light emitting diode, the light emitting diode is electrically connected to the synchronous control logic circuit, Wherein a plurality of light-emitting diode driving devices are connected in series; the AC power supply device transmits an AC power to the rectifying and filtering circuit; the rectifying and filtering circuit rectifies and filters the AC power to obtain a DC power; the rectifying and filtering circuit transmits the DC power to the voltage regulator; After the voltage regulator receives the DC power supply, the voltage regulator generates a first voltage; after the voltage regulator generates the first voltage, the voltage regulator transmits the DC power supply to the next LED drive device; the voltage After the regulator generates the first voltage, the voltage regulator transmits the first voltage to the synchronization signal generating circuit; After the synchronous signal generating circuit receives the first voltage, the synchronous signal generating circuit generates a second voltage; the synchronous signal generating circuit subtracts the second voltage from the first voltage to obtain a synchronous signal; the synchronous signal generates The circuit transmits the synchronous signal to the synchronous control logic circuit; through the plurality of synchronous signals, the plurality of LED driving devices synchronously drives the at least one LED. 5. The light emitting diode driving device according to claim 4, wherein the synchronous signal generating circuit comprises: a constant voltage generator electrically connected to the voltage regulator; a voltage subtractor electrically connected to the voltage regulator and the constant voltage generator; and A signal filter, the signal filter is electrically connected to the voltage regulator, the constant voltage generator, the voltage subtractor and the synchronous control logic circuit. 6. The LED driving device according to claim 5, further comprising: A luminescence variation control circuit, the luminescence variation control circuit is electrically connected to the voltage regulator and the synchronous control logic circuit; an oscillator electrically connected to the voltage regulator, the synchronous control logic circuit and the light emission variation control circuit; a driving current control circuit, the driving current control circuit is electrically connected to the voltage regulator and the light emission variation control circuit; and A plurality of driving current output circuits, the plurality of driving current output circuits are electrically connected to the driving current control circuit and the at least one light emitting diode.