CN102883511A - Multi-path series-parallel LED (light-emitting diode) load fault protection driving circuit and fault diagnosis and protection method - Google Patents

Multi-path series-parallel LED (light-emitting diode) load fault protection driving circuit and fault diagnosis and protection method Download PDF

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CN102883511A
CN102883511A CN2012103942744A CN201210394274A CN102883511A CN 102883511 A CN102883511 A CN 102883511A CN 2012103942744 A CN2012103942744 A CN 2012103942744A CN 201210394274 A CN201210394274 A CN 201210394274A CN 102883511 A CN102883511 A CN 102883511A
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load fault
load
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陈冉
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TAICANG ETHER POWER ELECTRONICS TECHNOLOGY Co Ltd
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Abstract

本发明公开一种多路串并联 LED 负载故障保护驱动电路及 LED 负载故障诊断保护方法，通过增加了变压器的第二原边绕组及负载故障判断控制单元，当发生 LED 负载故障时，变压器的第二原边绕组将驱动电路输出端的电压变化信号反馈至所述负载故障判断控制单元，负载故障判断控制单元将减小输出以减小电压基准芯片的基准电压输出信号，并控制驱动模块的输出以减小驱动电路的输出电流，以保护剩余的 LED 负载正常工作。与现有技术相比，本发明是在现有的 LED 连接条件下进行高效的控制并保护其余非故障 LED 光源，成本较低，具有较好的经济效益。

Figure 201210394274

The invention discloses a multi-channel series-parallel LED load fault protection drive circuit and an LED load fault diagnosis and protection method. By adding the second primary side winding of the transformer and a load fault judgment control unit, when an LED load fault occurs, the transformer's first The two primary windings feed back the voltage change signal at the output of the drive circuit to the load fault judgment control unit, the load fault judgment control unit will reduce the output to reduce the reference voltage output signal of the voltage reference chip, and control the output of the drive module to Reduce the output current of the drive circuit to protect the remaining LED loads to work normally. Compared with the prior art, the present invention efficiently controls and protects other non-faulty LED light sources under the existing LED connection conditions , and has lower cost and better economic benefits.

Figure 201210394274

Description

Multichannel connection in series-parallel LED load fault protection drive circuit and failure diagnosis guard method
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Technical field
The present invention relates to the LED electronic application field, relate in particular to a kind of multichannel connection in series-parallel LED load fault protection drive circuit and multichannel connection in series-parallel LED load faulty diagnosis and protection method.
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.
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Summary of the invention
For the deficiencies in the prior art; the technical problem to be solved in the present invention 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 present invention 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.
The present invention also provides a kind of multichannel connection in series-parallel LED load faulty diagnosis and protection method, 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, increase by the second former limit winding on the former limit of described transformer, the signal feedback that secondary voltage rises when being used for load faulty is to former limit;
Increase respectively and judge control unit with the load faulty that the first former limit winding of transformer is connected with the second former limit winding, described load faulty judges that control unit is for the input signal that judges whether load faulty to occur and control described voltage reference chip;
Described load faulty is judged that control unit is connected with driver module, when load faulty occurs when, the second former limit winding of described transformer feeds back to described load faulty with fault-signal and judges control unit, described load faulty judgement control unit will be adjusted the reference voltage output signal of voltage reference chip after being judged as load faulty, reference voltage output signal after the adjustment is inputted described load faulty and is judged control unit, controls the output of described driver module to reduce the output current of drive circuit by described load faulty judgement control unit.
Preferably, described fault-signal is the voltage change signal of drive circuit output.
Preferably, described load faulty judges that control unit is 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, 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.
Compared with prior art advantage of the present invention is: the present invention judges 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 present invention controls efficiently under existing LED condition of contact and protects all the other non-fault led light sources, and cost is lower, has preferably economic benefit.
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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 invention;
Embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing:
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 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.
The present invention also provides a kind of multichannel connection in series-parallel LED load faulty diagnosis and protection method; 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; increase by the second former limit winding on the former limit of described transformer; the signal feedback that secondary voltage rises when being used for load faulty arrives former limit, and inputs to the MCU micro-control unit.
Also increased respectively the MCU micro-control unit that is connected with the second former limit winding with the first former limit winding of transformer, described MCU micro-control unit is used for the input signal that judges whether that the LED load faulty occurs and control described voltage reference chip.
Described load faulty is judged that control unit is connected with driver module, when the LED load faulty occurs when, the second former limit winding of described transformer feeds back to the MCU micro-control unit with the voltage change signal of drive circuit output, after the MCU micro-control unit as calculated, relatively is judged as load faulty, the reference voltage output signal of voltage reference chip will be adjusted, the reference voltage output signal inputs to the MCU micro-control unit, by the output of MCU micro-control unit controls driver module to reduce the output current of drive circuit.
The MCU micro-control unit changes the duty ratio of metal-oxide-semiconductor to reduce the output current of drive circuit in the present embodiment.
Be connected with the first optocoupler and the second optocoupler between MCU micro-control unit and the voltage reference chip, 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 present invention judges 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 present invention controls efficiently under existing LED condition of contact and protects all the other non-fault led light sources, and cost is lower, has preferably economic benefit.
The present invention also can have other various embodiments; in the situation that do not deviate from spirit of the present invention and essence; those skilled in the art can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the scope of claim protection of the present invention.

Claims (10)

1.一种多路串并联LED负载故障保护驱动电路，包括与变压器的第一原边绕组相连接的整流电路和驱动模块、连接在驱动电路输出端的电压基准芯片，其特征在于，它还包括： 1. A multi-channel series-parallel LED load fault protection drive circuit, comprising a rectifier circuit connected to the first primary winding of the transformer and a drive module, a voltage reference chip connected to the output of the drive circuit, characterized in that it also includes : 变压器的第二原边绕组，用于将负载故障时副边电压上升的信号反馈到原边； The second primary winding of the transformer is used to feed back the signal of the voltage rise of the secondary side to the primary side when the load fails; 负载故障判断控制单元，所述负载故障判断控制单元分别与变压器的第一原边绕组和第二原边绕组相连接，用于判断是否发生负载故障并控制所述电压基准芯片的输入信号； A load fault judgment control unit, the load fault judgment control unit is respectively connected to the first primary winding and the second primary winding of the transformer, and is used to judge whether a load fault occurs and to control the input signal of the voltage reference chip; 所述负载故障判断控制单元与驱动模块相连接，当判断发生负载故障时，所述变压器的第二原边绕组将故障信号反馈至所述负载故障判断控制单元，所述负载故障判断控制单元将调整电压基准芯片的基准电压，并控制所述驱动模块的输出以减小驱动电路的输出电流。 The load fault judgment control unit is connected to the drive module, and when it is judged that a load fault occurs, the second primary winding of the transformer feeds back a fault signal to the load fault judgment control unit, and the load fault judgment control unit will The reference voltage of the voltage reference chip is adjusted, and the output of the driving module is controlled to reduce the output current of the driving circuit. 2.根据权利要求1所述的一种多路串并联LED负载故障保护驱动电路，其特征在于：所述负载故障判断控制单元包括MCU微控制单元。 2. A multi-channel series-parallel LED load fault protection drive circuit according to claim 1, characterized in that: the load fault judgment control unit includes an MCU micro control unit. 3.根据权利要求2所述的一种多路串并联LED负载故障保护驱动电路，其特征在于：所述MCU微控制单元改变MOS管的占空比以减小驱动电路的输出电流。 3. A multi-channel series-parallel LED load fault protection driving circuit according to claim 2, characterized in that: said MCU micro control unit changes the duty cycle of the MOS transistor to reduce the output current of the driving circuit. 4.根据权利要求2所述的一种多路串并联LED负载故障保护驱动电路，其特征在于：所述MCU微控制单元与电压基准芯片之间连接有第一光耦和第二光耦，所述第一光耦和第二光耦的信号传输方向相反。 4. A multi-channel series-parallel LED load fault protection drive circuit according to claim 2, characterized in that: a first optocoupler and a second optocoupler are connected between the MCU micro control unit and the voltage reference chip, Signal transmission directions of the first optocoupler and the second optocoupler are opposite. 5.根据权利要求1所述的一种多路串并联LED负载故障保护驱动电路，其特征在于：所述故障信号为驱动电路输出端的电压变化信号。 5 . The multi-channel series-parallel LED load fault protection drive circuit according to claim 1 , wherein the fault signal is a voltage change signal at the output end of the drive circuit. 6 . 6.一种多路串并联LED负载故障诊断保护方法，多路串并联LED负载故障保护驱动电路包括与变压器的第一原边绕组相连接的整流电路和驱动模块、连接在驱动电路输出端的电压基准芯片，其特征在于，在所述变压器的原边增加第二原边绕组，用于将负载故障时副边电压上升的信号反馈到原边； 6. A multi-channel series-parallel LED load fault diagnosis and protection method, the multi-channel series-parallel LED load fault protection drive circuit includes a rectifier circuit and a drive module connected to the first primary winding of the transformer, and a voltage connected to the output terminal of the drive circuit The reference chip is characterized in that a second primary winding is added to the primary side of the transformer to feed back the signal of the voltage rise of the secondary side to the primary side when the load fails; 增加分别与变压器的第一原边绕组和第二原边绕组相连接的负载故障判断控制单元，所述负载故障判断控制单元用于判断是否发生负载故障并控制所述电压基准芯片的输入信号； Adding a load fault judgment control unit respectively connected to the first primary winding and the second primary winding of the transformer, the load fault judgment control unit is used to judge whether a load fault occurs and to control the input signal of the voltage reference chip; 将所述负载故障判断控制单元与驱动模块相连接，当发生负载故障时，所述变压器的第二原边绕组将故障信号反馈至所述负载故障判断控制单元，所述负载故障判断控制单元经判断为负载故障后将调整电压基准芯片的基准电压，调整后的基准电压输出信号输入所述负载故障判断控制单元，由所述负载故障判断控制单元控制所述驱动模块的输出以减小驱动电路的输出电流。 The load fault judgment control unit is connected with the drive module, and when a load fault occurs, the second primary winding of the transformer feeds back a fault signal to the load fault judgment control unit, and the load fault judgment control unit passes After it is judged as a load fault, the reference voltage of the voltage reference chip will be adjusted, and the adjusted reference voltage output signal is input to the load fault judgment control unit, and the output of the drive module is controlled by the load fault judgment control unit to reduce the driving circuit. output current. 7.根据权利要求6所述的一种多路串并联LED负载故障诊断保护方法，其特征在于：所述故障信号为驱动电路输出端的电压变化信号。 7. The method for fault diagnosis and protection of multi-channel series-parallel LED loads according to claim 6, wherein the fault signal is a voltage change signal at the output end of the drive circuit. 8.根据权利要求7所述的一种多路串并联LED负载故障诊断保护方法，其特征在于：所述负载故障判断控制单元为MCU微控制单元。 8. A method for diagnosing and protecting multi-channel series-parallel LED load faults according to claim 7, characterized in that: the load fault judgment control unit is an MCU micro control unit. 9.根据权利要求8所述的一种多路串并联LED负载故障诊断保护方法，其特征在于：所述MCU微控制单元改变MOS管的占空比以减小驱动电路的输出电流。 9. A method for fault diagnosis and protection of multi-channel series-parallel LED loads according to claim 8, wherein the MCU micro-control unit changes the duty ratio of the MOS transistors to reduce the output current of the drive circuit. 10.根据权利要求9所述的一种多路串并联LED负载故障诊断保护方法，其特征在于：所述MCU微控制单元与电压基准芯片之间连接有第一光耦和第二光耦，当发生负载故障时，所述负载故障判断控制单元的输出信号经第二光耦输入电压基准芯片以调整基准电压输出信号，调整后的基准电压输出信号经第一光耦输入所述负载故障判断控制单元。 10. A multi-channel series-parallel LED load fault diagnosis and protection method according to claim 9, characterized in that: a first optocoupler and a second optocoupler are connected between the MCU micro control unit and the voltage reference chip, When a load fault occurs, the output signal of the load fault judgment control unit is input to the voltage reference chip through the second optocoupler to adjust the reference voltage output signal, and the adjusted reference voltage output signal is input to the load fault judgment through the first optocoupler control unit.
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