CN202873140U - Multipath serial-parallel LED load fault protection drive circuit - Google Patents
Multipath serial-parallel LED load fault protection drive circuit Download PDFInfo
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- CN202873140U CN202873140U CN 201220530394 CN201220530394U CN202873140U CN 202873140 U CN202873140 U CN 202873140U CN 201220530394 CN201220530394 CN 201220530394 CN 201220530394 U CN201220530394 U CN 201220530394U CN 202873140 U CN202873140 U CN 202873140U
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Abstract
The utility model relates to a multipath serial-parallel LED load fault protection drive circuit. Through adding a second primary winding of a transformer and a load fault judging and control unit, when a fault occurs in an LED load, the second primary winding of the transformer feeds back a voltage change signal of the output end of the drive circuit to the load fault judging and control unit, the load fault judging and control unit decreases an output so as to decrease a reference voltage output signal of a voltage reference chip, and controls an output of a driver module so as to decrease an output current of the drive circuit and protect the rest of LED loads to work normally. Compared with the prior art, the multipath serial-parallel LED load fault protection drive circuit can control and protect the remaining non-fault LED light sources under existing LED connecting conditions, the cost is relatively low, and relatively good economic benefits can be achieved.
Description
Technical field
The utility model relates to the LED electronic application field, relates in particular to a kind of multichannel connection in series-parallel LED load fault protection drive circuit.
Background technology
Along with the development of lighting technology, led light source is just obtaining increasing development as a kind of green light source of new rise, and the utilization of LED is just becoming following trend.In numerous LED application technologies, for the connected mode of LED, except some special occasions, now substantially all be to adopt the mode also of going here and there to connect, even encapsulate such as the COB of now new rise, its internal structure also is these modes of employing.Such connected mode has very large benefit for the utilization of LED, but also brings the other drawback simultaneously.
For example, as shown in Figure 1, because LED adopts string and connection, if in the use procedure of reality, have a LED to break down among the LED of single string, blow such as open circuit that (short circuit also may occur, but after the LED short circuit, owing to can pass through larger electric current, in very short time the inside, this LEDs can be blown by large electric current, and last phenomenon of the failure also is to present open loop state).Because it is to be in constant current state that LED drives, for other paths of LEDs of this load, the electric current above it can increase (such as 2 road and 3 tunnel of Fig. 1, the amplitude of its increase is originally to flow through 1 tunnel electric current also to share out equally on 2 the tunnel, the 3 tunnel now) accordingly.Like this, extremely easily cause the damage of 2 road and 3 tunnel LED.
In the prior art, for such situation, LED driving power on market is also adjusted, and namely a LED drives and is output as multichannel output, gives 1 the tunnel respectively, 2 the tunnel, 3 tunnel LED powers, even like this a paths of LEDs light source goes wrong, also can not have influence on other two-way, guarantee the normal operation of LED, stoped the appearance of above-mentioned said vicious circle phenomenon.
Although now on the market general LED driving needle to the solution of led light source string and mode, other led light sources in parallel when the led light source fault, have been avoided damaging, make problem obtain very large improvement, yet on the cost that LED drives, but be greatly improved.Not removing first will realize on circuit the cost of several roads output increase, singly is on the output wire rod, just has been increased to three by original solid wire.Therefore the method for head it off of the prior art has the drawback that very large cost rises.
Summary of the invention
For the deficiencies in the prior art; the technical problems to be solved in the utility model provides a kind of multichannel connection in series-parallel LED load fault protection drive circuit and failure diagnosis guard method; when the series-parallel LED load of multichannel wherein riches all the way when giving birth to fault, can in time judge the output current that breaks down and reduce drive circuit to protect other LED loads normal operations.
Technical scheme provided by the utility model is; a kind of multichannel connection in series-parallel LED load fault protection drive circuit; comprise rectification circuit and the driver module that is connected with the first former limit winding of transformer, the voltage reference chip that is connected to the drive circuit output, also comprise:
The second former limit winding of transformer, the signal feedback that secondary voltage rises when being used for load faulty is to former limit;
Load faulty is judged control unit, and described load faulty judges that control unit is connected with the second former limit winding with the first former limit winding of transformer respectively, for the input signal that judges whether load faulty to occur and control described voltage reference chip;
Described load faulty judges that control unit is connected with driver module, when judging the generation load faulty, the second former limit winding of described transformer feeds back to described load faulty with fault-signal and judges control unit, described load faulty judges that control unit will change the reference voltage output signal of voltage reference chip, and the output of controlling described driver module is to reduce the output current of drive circuit.
Preferably, described load faulty judges that control unit comprises the MCU micro-control unit.
Preferably, described MCU micro-control unit changes the duty ratio of metal-oxide-semiconductor to reduce the output current of drive circuit.
Preferably, be connected with the first optocoupler and the second optocoupler between described MCU micro-control unit and the voltage reference chip, the side signal transmission of described the first optocoupler and the second optocoupler is on the contrary.
Preferably, described fault-signal is the voltage change signal of drive circuit output.
Compared with prior art advantage of the present invention is: the utility model is judged control unit by the second former limit winding and the load faulty that have increased transformer, when the LED load faulty occurs when, the output voltage variation of led drive circuit is fed back to load faulty judgement control unit through the second former limit winding, and load faulty judges that control unit reduces the output current of drive circuit after being judged as fault.Compared with prior art, the utility model is to control efficiently under existing LED condition of contact and protect all the other non-fault led light sources, and cost is lower, has preferably economic benefit.
Description of drawings
Accompanying drawing 1 is multichannel connection in series-parallel LED load fault protection drive circuit of the prior art;
Accompanying drawing 2 is multichannel connection in series-parallel LED load fault protection drive circuit of the present utility model;
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail:
As shown in Figure 2, a kind of multichannel connection in series-parallel LED load fault protection drive circuit, the input of drive circuit is connected with civil power, and output is connected with multichannel connection in series-parallel LED load.This drive circuit comprises rectification circuit and the driver module that is connected with the first former limit winding of transformer, the voltage reference chip that is connected to the drive circuit output, also comprise: the second former limit winding of transformer, the signal feedback that secondary voltage rises when being used for load faulty is to former limit;
Load faulty is judged control unit, and described load faulty judges that control unit is connected with the second former limit winding with the first former limit winding of transformer respectively, for the input signal that judges whether load faulty to occur and control described voltage reference chip;
Load faulty judges that control unit is connected with driver module; when judging generation LED load faulty; the second former limit winding of transformer feeds back to described load faulty judgement control unit with the voltage change signal of drive circuit output; load faulty judgement control unit will be adjusted the reference voltage output signal of voltage reference chip; and the output of control driver module is to reduce the output current of drive circuit, to protect remaining LED load normal operation.
Load faulty judges that control unit is the MCU micro-control unit in the present embodiment.The duty ratio of MCU micro-control unit by changing metal-oxide-semiconductor is to reduce the output current of drive circuit.
Be connected with the first optocoupler and the second optocoupler between micro-control unit and the voltage reference chip, the side signal transmission of described the first optocoupler and the second optocoupler is on the contrary.When load faulty occurs when, to adjust the reference voltage output signal, input described load faulty through the first optocoupler and judge control unit by the reference voltage output signal after the adjustment through the second optocoupler input voltage fiducial chip for the output signal of described load faulty judgement control unit.
The utility model is judged control unit by the second former limit winding and the load faulty that have increased transformer, when the LED load faulty occurs when, the output voltage variation of led drive circuit is fed back to load faulty judgement control unit through the second former limit winding, and load faulty judges that control unit reduces the output current of drive circuit after being judged as fault.Compared with prior art, the utility model is to control efficiently under existing LED condition of contact and protect all the other non-fault led light sources, and cost is lower, has preferably economic benefit.
The utility model also can have other various embodiments; in the situation that do not deviate from the utility model spirit and essence; those skilled in the art can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the scope of claim protection of the present utility model.
Claims (5)
1. a multichannel connection in series-parallel LED load fault protection drive circuit comprises rectification circuit and the driver module that is connected with the first former limit winding of transformer, the voltage reference chip that is connected to the drive circuit output, it is characterized in that, it also comprises:
The second former limit winding of transformer, the signal feedback that secondary voltage rises when being used for load faulty is to former limit;
Load faulty is judged control unit, and described load faulty judges that control unit is connected with the second former limit winding with the first former limit winding of transformer respectively, for the input signal that judges whether load faulty to occur and control described voltage reference chip;
Described load faulty judges that control unit is connected with driver module, when judging the generation load faulty, the second former limit winding of described transformer feeds back to described load faulty with fault-signal and judges control unit, described load faulty judges that control unit will adjust the reference voltage of voltage reference chip, and the output of controlling described driver module is to reduce the output current of drive circuit.
2. a kind of multichannel connection in series-parallel LED load fault protection drive circuit according to claim 1 is characterized in that: described load faulty judges that control unit comprises the MCU micro-control unit.
3. a kind of multichannel connection in series-parallel LED load fault protection drive circuit according to claim 2 is characterized in that: described MCU micro-control unit changes the duty ratio of metal-oxide-semiconductor to reduce the output current of drive circuit.
4. a kind of multichannel connection in series-parallel LED load fault protection drive circuit according to claim 2; it is characterized in that: be connected with the first optocoupler and the second optocoupler between described MCU micro-control unit and the voltage reference chip, the side signal transmission of described the first optocoupler and the second optocoupler is on the contrary.
5. a kind of multichannel connection in series-parallel LED load fault protection drive circuit according to claim 1, it is characterized in that: described fault-signal is the voltage change signal of drive circuit output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220530394 CN202873140U (en) | 2012-10-17 | 2012-10-17 | Multipath serial-parallel LED load fault protection drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220530394 CN202873140U (en) | 2012-10-17 | 2012-10-17 | Multipath serial-parallel LED load fault protection drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202873140U true CN202873140U (en) | 2013-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220530394 Expired - Fee Related CN202873140U (en) | 2012-10-17 | 2012-10-17 | Multipath serial-parallel LED load fault protection drive circuit |
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| Country | Link |
|---|---|
| CN (1) | CN202873140U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102883511A (en) * | 2012-10-17 | 2013-01-16 | 太仓电威光电有限公司 | Multi-path series-parallel LED (light-emitting diode) load fault protection driving circuit and fault diagnosis and protection method |
| CN103874300A (en) * | 2014-03-31 | 2014-06-18 | 太仓电威光电有限公司 | Method and system for adjusting parameters of output end of LED drive |
| CN108880274A (en) * | 2017-05-15 | 2018-11-23 | 赤多尼科两合股份有限公司 | A kind of output current detection circuit of controlled resonant converter |
-
2012
- 2012-10-17 CN CN 201220530394 patent/CN202873140U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102883511A (en) * | 2012-10-17 | 2013-01-16 | 太仓电威光电有限公司 | Multi-path series-parallel LED (light-emitting diode) load fault protection driving circuit and fault diagnosis and protection method |
| CN103874300A (en) * | 2014-03-31 | 2014-06-18 | 太仓电威光电有限公司 | Method and system for adjusting parameters of output end of LED drive |
| CN108880274A (en) * | 2017-05-15 | 2018-11-23 | 赤多尼科两合股份有限公司 | A kind of output current detection circuit of controlled resonant converter |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130410 Termination date: 20141017 |
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| EXPY | Termination of patent right or utility model |