CN102883511B - 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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- CN102883511B CN102883511B CN201210394274.4A CN201210394274A CN102883511B CN 102883511 B CN102883511 B CN 102883511B CN 201210394274 A CN201210394274 A CN 201210394274A CN 102883511 B CN102883511 B CN 102883511B
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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
Technical field
the present invention relates to 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, has been substantially all now adopt string and mode connect, even as new COB encapsulation of rising now, its internal structure is also to adopt these modes.Such connected mode has very large benefit for the utilization of LED, but also brings other drawback simultaneously.
for example, as shown in Figure 1, because LED adopts go here and there and connect, if have a LED to break down in the LED of single string in actual use procedure, as open circuit blows, (short circuit also may occur, but after LED short circuit, because meeting is by larger electric current, in very short time the inside, this LEDs can be blown by large electric current, and last phenomenon of the failure is also to present open loop state).Be in constant current state because LED drives, for other paths of LEDs of this load, the electric current above it can increase (as 2 roads of Fig. 1 and 3 tunnels, the amplitude of its increase is that the electric current that originally flow through 1 tunnel is also shared out equally 2 tunnels now, on 3 tunnels) accordingly.Like this, extremely easily cause the damage of the LED on 2 roads and 3 tunnels.
in prior art, for such situation, LED driving power on market is also adjusted, and a LED drives and is output as multichannel output, gives respectively 1 tunnel, 2 tunnels, the LED on 3 tunnels powers, even if like this paths of LEDs light source goes wrong, also can not have influence on other two-way, ensure the normal work of LED, stoped the appearance of above-mentioned said vicious circle phenomenon.
although the now general LED driving needle solution to LED light source string mode on market, other LED light sources in parallel in the time of LED light source fault, are avoided damaging, make problem obtain very large improvement, but be but greatly improved on the cost driving at LED.First not going to say and on circuit, will realize the cost that the output of several roads increases, is singly on output wire rod, has just 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 problem to be solved in the present invention is to provide a kind of multichannel connection in series-parallel LED load fault protection drive circuit and failure diagnosis guard method; in the time of wherein riches all the way the raw fault of the series-parallel LED load of multichannel, can judge in time the output current breaking down and reduce drive circuit to protect other LED loads normally to work.
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 being connected with the first former limit winding of transformer, the voltage reference chip that is connected to drive circuit output, also comprise:
the second former limit winding of transformer, the signal feedback that secondary voltage rises when by load faulty is to former limit;
load faulty judges 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, in the time there is load faulty in judgement, the second former limit winding of described transformer feeds back to described load faulty by 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 MCU micro-control unit.
preferably, the duty ratio that described MCU micro-control unit changes metal-oxide-semiconductor is 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 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 being connected with the first former limit winding of transformer, the voltage reference chip that is connected to 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 by load faulty is to former limit;
increase and judge control unit with the first former limit winding of transformer with the load faulty that the second former limit winding is connected respectively, described load faulty judges the input signal of control unit for judging whether load faulty to occur and control described voltage reference chip;
described load faulty is judged to control unit is connected with driver module, in the time there is load faulty, the second former limit winding of described transformer feeds back to described load faulty by fault-signal and judges control unit, described load faulty judges that control unit will adjust the reference voltage output signal of voltage reference chip after being judged as load faulty, reference voltage output signal after adjustment is inputted described load faulty and is judged control unit, and the output that judges driver module described in control unit control by described load faulty is to reduce the output current of drive circuit.
preferably, described fault-signal is the voltage change signal of drive circuit output.
preferably, described load faulty judges that control unit is MCU micro-control unit.
preferably, the duty ratio that described MCU micro-control unit changes metal-oxide-semiconductor is to reduce the output current of drive circuit.
preferably, between described MCU micro-control unit and voltage reference chip, be connected with the first optocoupler and the second optocoupler, in the time there is load faulty, the output signal that described load faulty judges control unit is through the second optocoupler input voltage fiducial chip to adjust reference voltage output signal, and the reference voltage output signal after adjustment is inputted described load faulty through the first optocoupler and judged 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, in the time there is LED load faulty, the output voltage variation of LED drive circuit is fed back to load faulty through the second former limit winding and judge control unit, 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 and protects all the other non-fault LED light sources under existing LED condition of contact, and cost is lower, has good economic benefit.
Brief description of the 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
below in conjunction with accompanying drawing, the present invention is further detailed explanation:
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 being connected with the first former limit winding of transformer, the voltage reference chip that is connected to drive circuit output, also comprise: the second former limit winding of transformer, the signal feedback that secondary voltage rises when by load faulty is to former limit;
load faulty judges 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; in the time there is LED load faulty in judgement; the second former limit winding of transformer feeds back to described load faulty by the voltage change signal of drive circuit output and judges control unit; load faulty judges that control unit will adjust the reference voltage output signal of voltage reference chip; and the output of controlling driver module is to reduce the output current of drive circuit, to protect remaining LED load normally to work.
in present embodiment, load faulty judges that control unit is MCU micro-control unit.MCU micro-control unit is by changing the duty ratio of metal-oxide-semiconductor to reduce the output current of drive circuit.
between MCU micro-control unit and voltage reference chip, be connected with the first optocoupler and the second optocoupler, 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 being connected with the first former limit winding of transformer, the voltage reference chip that is connected to drive circuit output; increase by the second former limit winding on the former limit of described transformer; the signal feedback that while being used for load faulty, secondary voltage rises arrives former limit, and inputs to MCU micro-control unit.
also increase the MCU micro-control unit being connected with the second former limit winding with the first former limit winding of transformer respectively, the input signal of described MCU micro-control unit for judging whether that LED load faulty occurs and controlling described voltage reference chip.
described load faulty is judged to control unit is connected with driver module, in the time there is LED load faulty, the voltage change signal of drive circuit output is fed back to MCU micro-control unit by the second former limit winding of described transformer, MCU micro-control unit as calculated, is relatively judged as after load faulty, the reference voltage output signal of voltage reference chip will be adjusted, reference voltage output signal inputs to MCU micro-control unit, by the output of MCU micro-control unit controls driver module to reduce the output current of drive circuit.
the duty ratio that in present embodiment, MCU micro-control unit changes metal-oxide-semiconductor is to reduce the output current of drive circuit.
between MCU micro-control unit and voltage reference chip, be connected with the first optocoupler and the second optocoupler, in the time there is load faulty, the output signal that described load faulty judges control unit is through the second optocoupler input voltage fiducial chip to adjust reference voltage output signal, and the reference voltage output signal after adjustment is inputted described load faulty through the first optocoupler and judged control unit.
the present invention judges control unit by the second former limit winding and the load faulty that have increased transformer, in the time there is LED load faulty, the output voltage variation of LED drive circuit is fed back to load faulty through the second former limit winding and judge control unit, 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 and protects all the other non-fault LED light sources under existing LED condition of contact, and cost is lower, has good economic benefit.
the present invention also can have other various embodiments; in the situation that not deviating 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 (8)
1. a multichannel connection in series-parallel LED load fault protection drive circuit, comprises rectification circuit and the driver module being connected with the first former limit winding of transformer, the voltage reference chip that is connected to 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 by load faulty is to former limit;
MCU micro-control unit, described MCU micro-control unit is connected with the second former limit winding of transformer, for the input signal that judges whether load faulty to occur and control described voltage reference chip;
Described MCU micro-control unit is connected with driver module, in the time there is load faulty in judgement, fault-signal is fed back to described MCU micro-control unit by the second former limit winding of described transformer, described MCU micro-control unit will be adjusted 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 MCU micro-control unit changes the duty ratio of metal-oxide-semiconductor to reduce the output current of drive circuit.
3. a kind of multichannel connection in series-parallel LED load fault protection drive circuit according to claim 2; it is characterized in that: between described MCU micro-control unit and voltage reference chip, be connected with the first optocoupler and the second optocoupler, the side signal transmission of described the first optocoupler and the second optocoupler is on the contrary.
4. a kind of multichannel connection in series-parallel LED load fault protection drive circuit according to claim 1, is characterized in that: described fault-signal is the voltage change signal of drive circuit output.
5. a 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 being connected with the first former limit winding of transformer, the voltage reference chip that is connected to 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 by load faulty is to former limit;
Increase the MCU micro-control unit being connected with the second former limit winding of transformer, the input signal of described MCU micro-control unit for judging whether load faulty to occur and control described voltage reference chip;
Described MCU micro-control unit is connected with driver module, in the time there is load faulty, fault-signal is fed back to described MCU micro-control unit by the second former limit winding of described transformer, described MCU micro-control unit will be adjusted the reference voltage of voltage reference chip after being judged as load faulty, reference voltage output signal after adjustment input MCU micro-control unit, by the output of driver module described in described MCU micro-control unit controls to reduce the output current of drive circuit.
6. a kind of multichannel connection in series-parallel LED load faulty diagnosis and protection method according to claim 5, is characterized in that: described fault-signal is the voltage change signal of drive circuit output.
7. a kind of multichannel connection in series-parallel LED load faulty diagnosis and protection method according to claim 5, 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.
8. a kind of multichannel connection in series-parallel LED load faulty diagnosis and protection method according to claim 7; it is characterized in that: between described MCU micro-control unit and voltage reference chip, be connected with the first optocoupler and the second optocoupler; in the time there is load faulty; the output signal of described MCU micro-control unit is through the second optocoupler input voltage fiducial chip to adjust reference voltage output signal, and the reference voltage output signal after adjustment is inputted described MCU micro-control unit through the first optocoupler.
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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 true CN102883511B (en) | 2014-11-05 |
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| CN109884555B (en) * | 2017-12-06 | 2021-03-19 | 台达电子企业管理（上海）有限公司 | Direct-current centralized lighting system and method for measuring lamp state thereof |
| CN111182678A (en) * | 2019-12-27 | 2020-05-19 | 安徽乐图电子科技有限公司 | LED driving method, LED driving circuit and LED lighting lamp applying LED driving circuit |
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