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 PDFInfo
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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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Abstract
The invention discloses a multi-path series-parallel LED (light-emitting diode) load fault protection driving circuit and an LED load fault diagnosis and protection method. As the multi-path series-parallel LED load fault protection driving circuit is additionally provided with a second primary winding of a transformer and a load fault diagnosis and control unit, when an LED load has faults, voltage change signals at the output end of the driving circuit are fed back to the load fault diagnosis and control unit by the second primary winding of the transformer, and the load fault diagnosis and control unit reduces the output so as to reduce reference voltage output signals of a voltage reference chip and controls the output of a driving module to reduce output current of the driving circuit so as to ensure the normal operation of the rest LED loads. Compared with the prior art, the multi-path series-parallel LED load fault protection driving circuit and the LED load fault diagnosis and protection method can efficiently control and protect other non-fault LED light sources under the existing LED connection condition, and have the advantages of low cost and favorable economic benefits.
Description
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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. 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.
6. 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, it is characterized in that, 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 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.
7. a kind of multichannel connection in series-parallel LED load faulty diagnosis and protection method according to claim 6, it is characterized in that: described fault-signal is the voltage change signal of drive circuit output.
8. a kind of multichannel connection in series-parallel LED load faulty diagnosis and protection method according to claim 7 is characterized in that: described load faulty judges that control unit is the MCU micro-control unit.
9. a kind of multichannel connection in series-parallel LED load faulty diagnosis and protection method according to claim 8 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.
10. a kind of multichannel connection in series-parallel LED load faulty diagnosis and protection method according to claim 9; 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; 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.
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| CN201210394274.4A CN102883511B (en) | 2012-10-17 | 2012-10-17 | Multi-path series-parallel LED (light-emitting diode) load fault protection driving circuit and fault diagnosis and protection method |
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| CN201210394274.4A CN102883511B (en) | 2012-10-17 | 2012-10-17 | Multi-path series-parallel LED (light-emitting diode) load fault protection driving circuit and fault diagnosis and protection method |
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| CN102883511B (en) | 2014-11-05 |
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