CN113891521B - PWM chopping dimming redundant circuit and chopping dimming method thereof - Google Patents
PWM chopping dimming redundant circuit and chopping dimming method thereof Download PDFInfo
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- CN113891521B CN113891521B CN202111307708.8A CN202111307708A CN113891521B CN 113891521 B CN113891521 B CN 113891521B CN 202111307708 A CN202111307708 A CN 202111307708A CN 113891521 B CN113891521 B CN 113891521B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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Abstract
The invention provides a PWM chopping dimming redundant circuit which comprises a control unit, an LED load module connected with a direct current bus and a PWM switch unit connected with the control unit and the LED load module, wherein the control unit comprises a power supply module, a PWM control signal module, a signal detection module and an alarm module, the PWM switch unit comprises a main switch circuit and a redundant switch circuit connected with the main switch circuit in parallel, the main switch circuit comprises a first MOS tube, and the redundant switch circuit comprises a second MOS tube connected with the first MOS tube in parallel. According to the PWM chopper dimming redundant circuit, the signal detection module and the alarm module are arranged in the control unit, and the redundant switch circuit is additionally arranged in the PWM switch unit to serve as a standby switch circuit of the main switch circuit, so that the condition that the LED load module is turned off is avoided.
Description
[ field of technology ]
The invention relates to the technical field of circuits, in particular to a PWM chopping dimming redundant circuit and a chopping dimming method thereof.
[ background Art ]
The light source is a LED (light emitting diode) light source which is a green light source, and compared with the traditional light source, the LED light source has the characteristics of green and environment-friendly property, small size, low power consumption, long service life and the like, and is very suitable for being used as a lamp light source. The constant voltage power supply centralized power supply system designed for the LED load can convert the power supply into specific voltage and current to drive the LED load to emit light. Meanwhile, in order to meet the personalized requirements of users or adjust light according to environmental requirements so as to reduce energy consumption, the constant-voltage power supply centralized power supply system further comprises a communication module and further exchanges data with the LED load, so that control equipment and monitoring of lamps are realized.
One LED dimming technique that is widely used at present is PWM (Pulse Width Modulation ) chopper dimming technique, in which the lighting time of an LED light source is adjusted by adjusting the duty ratio of a PWM signal, and when the duty ratio of the PWM signal is larger, the longer the LED light source is lit in one period, the higher the brightness perceived by human eyes is, so as to realize dimming. The specific method for realizing PWM chopping dimming is to string a MOS tube (MOSFET field effect transistor for short) in an LED load and supply power to the anode of the LED load by using a constant current source. And then a PWM signal is applied to the grid electrode of the MOS tube so as to rapidly switch the LED load, thereby realizing dimming.
The PWM chopper dimming has the advantages of no chromatographic offset, high dimming accuracy, large dimming range and good stability under low brightness. However, one disadvantage of PWM chopper dimming is that if the power supply output current is large or other environmental problems cause the MOS transistor to fail, the LED lamp will be turned off when the MOS transistor is open. But in some key occasions, such as the scenes of indication marks of public spaces, fire-fighting channels, hospitals, factories and the like, the LED lamps cannot be extinguished in any state, otherwise serious accidents occur.
Therefore, it is necessary to provide a new PWM chopper dimming redundancy circuit and a chopper dimming method thereof to solve the above technical problems.
[ invention ]
The invention aims to provide a PWM chopper dimming redundant circuit and a chopper dimming method thereof, which can ensure that an LED load cannot be extinguished, so as to solve the problems in the related art.
In order to achieve the above purpose, the invention provides a PWM chopping dimming redundancy circuit, which comprises a control unit, an LED load module connected with a direct current bus and a PWM switching unit connected with the control unit and the LED load module, wherein the control unit comprises a power supply module, a PWM control signal module, a signal detection module and an alarm module, the PWM switching unit comprises a main switching circuit and a redundancy switching circuit connected with the main switching circuit in parallel, the main switching circuit comprises a first MOS tube, and the redundancy switching circuit comprises a second MOS tube connected with the first MOS tube in parallel.
More preferably, the PWM control signal module includes a first signal output port capable of outputting a first signal and a second signal output port capable of outputting a second signal.
More preferably, the grid electrode of the first MOS tube is connected with the first signal output port, the source electrode of the first MOS tube is connected with the negative electrode of the direct current bus, and the drain electrode of the first MOS tube is connected with the negative electrode of the signal detection module and the negative electrode of the LED load module.
More preferably, the grid electrode of the second MOS tube is connected with the second signal output port, the source electrode of the second MOS tube is connected with the negative electrode of the direct current bus, and the drain electrode of the second MOS tube is connected with the negative electrode of the signal detection module and the negative electrode of the LED load module.
More preferably, the signal detection module is connected with the power supply module, the PWM control signal module is connected with the power supply module, and the alarm module is connected with the power supply module.
More preferably, the PWM switching unit further includes a second redundant switching circuit connected in parallel with the main switching circuit, the second redundant switching circuit includes a third MOS transistor connected in parallel with the first MOS transistor, the PWM control signal module further includes a third signal output port connected to a gate of the third MOS transistor, a source of the third MOS transistor is connected to a cathode of the dc bus, and a drain of the third MOS transistor is connected to a cathode of the signal detection module and a cathode of the LED load module.
In order to achieve the above object, the present invention further provides a chopper dimming method of a PWM chopper dimming redundancy circuit, which includes a control unit, an LED load module connected to a dc bus, and a PWM switch unit connected to the control unit and the LED load module, wherein the control unit includes a power supply module, a PWM control signal module, a signal detection module, and an alarm module, the PWM control signal module can output a first signal and a second signal, the PWM switch unit includes a main switch circuit and a redundancy switch circuit connected in parallel with the main switch circuit, the main switch circuit includes a first MOS tube capable of receiving the first signal, the redundancy switch circuit includes a second MOS tube connected in parallel with the first MOS tube and capable of receiving the second signal, when the first MOS tube is not damaged, the PWM control signal module outputs the first signal to the first MOS tube, the first MOS tube works and performs PWM dimming on the LED load module, and the main switch circuit works normally; when the first MOS tube is opened, the main switch circuit is abnormal, the PWM control signal module stops transmitting the first signal and transmits the second signal to the second MOS tube, the second MOS tube works and PWM dimming is carried out on the LED load module, the main switch circuit stops working, the redundant switch circuit works normally, and the alarm module outputs an alarm signal; when the first MOS tube is short-circuited, the main switch circuit is abnormal, the PWM control signal module stops transmitting the first signal and the second signal, the LED load module is fully on, the main switch circuit and the redundant switch circuit stop working, and the alarm module outputs an alarm signal.
More preferably, the PWM control signal module includes a first signal output port outputting the first signal and a second signal output port outputting the second signal.
More preferably, the grid electrode of the first MOS tube is connected with the first signal output port, the source electrode of the first MOS tube is connected with the negative electrode of the direct current bus, and the drain electrode of the first MOS tube is connected with the negative electrode of the signal detection module and the negative electrode of the LED load module.
More preferably, the grid electrode of the second MOS tube is connected with the second signal output port, the source electrode of the second MOS tube is connected with the negative electrode of the direct current bus, and the drain electrode of the second MOS tube is connected with the negative electrode of the signal detection module and the negative electrode of the LED load module.
The invention has the technical effects that: the signal detection module and the alarm module are arranged in the control unit, and the redundant switch circuit connected with the main switch circuit in parallel is additionally arranged in the PWM switch unit, so that when the first MOS tube of the main switch circuit fails, the redundant switch circuit is used as a standby switch circuit, and the LED load module is prevented from being turned off.
[ description of the drawings ]
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
FIG. 1 is a block schematic diagram of a prior art PWM chopper dimmer circuit;
fig. 2 is a block diagram of a PWM chopper dimming redundancy circuit according to a first embodiment of the present invention.
Fig. 3 is a block diagram of a PWM chopper dimming redundancy circuit according to a second embodiment of the present invention.
[ detailed description ] of the invention
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, a PWM chopper dimmer circuit 100 'of the prior art includes a power supply module 11', a PWM control signal module 2 'connected to the power supply module 11', a MOS transistor Q1 'connected to the PWM control signal module 2', and an LED load module 3 'connected to the MOS transistor Q1'. The MOS transistor is short for MOSFET field effect transistor. The positive pole of LED load module 3 'is connected the positive pole of direct current busbar DCBUS, and the negative pole of PWM control signal 2' is connected to the grid of MOS pipe Q1', and the negative pole of LED load module 3' is connected to the drain electrode of MOS pipe Q1', and the negative pole of DCBUS is connected to the source electrode of MOS pipe Q1'.
The power supply module 11 'supplies power to the PWM control signal module 2', the PWM control signal module 2 'transmits PWM signals, and the MOS tube Q1' is controlled to rapidly switch the LED load module, so that the LED load is dimmed.
However, if the MOS transistor Q1 'fails, the LED load 3' is turned off.
As shown in fig. 2, a PWM chopper dimming redundancy circuit 100 according to a first embodiment of the present invention includes a control unit 1, a PWM switching unit 2, and an LED load module 3. The PWM switching unit 2 is connected to the control unit 1 and the LED load module 3. The anode of the LED load module 3 is connected to the anode of the dc bus DCBUS.
The control unit 1 comprises a power supply module 11, a signal detection module 13 connected with the power supply module 11, a PWM control signal module 12 connected with the power supply module 11, and an alarm module 14 connected with the power supply module 11. The alert module 14 may output an alert signal. The PWM control signal module 12 includes a first signal output port 121 through which the first signal PWM1 can be output, and a second signal output port 122 through which the second signal PWM2 can be output.
The PWM switching unit 2 includes a main switching circuit, and a redundant switching circuit connected in parallel with the main switching circuit. The main switch circuit comprises a first MOS tube Q1, wherein a grid electrode of the first MOS tube Q1 is connected with a first signal output port 121 of the PWM control signal module 2, a source electrode of the first MOS tube Q1 is connected with a cathode of the DCBUS, and a drain electrode of the first MOS tube Q1 is connected with a cathode of the signal detection module 13 and a cathode of the LED load module 3.
The redundant switch circuit comprises a second MOS tube Q2, wherein a grid electrode of the second MOS tube Q2 is connected with a second signal output port 122 of the PWM control signal module 12, a source electrode of the second MOS tube Q2 is connected with a cathode of the DCBUS, and a drain electrode of the second MOS tube Q2 is connected with a cathode of the signal detection module 13 and a cathode of the LED load module 3.
The working principle of the PWM chopper dimming redundancy circuit 100 of the present invention is:
when the power is on, the DC bus DCBUS has stable voltage output, and the power supply module 11 plays a role of power conversion and supplies power for the signal detection module 13, the PWM control signal module 12 and the alarm module 14. The direct current bus DCBUS supplies power to the LED load module 3.
The PWM control signal module 2 transmits the first signal PWM1 to make the first MOS transistor Q1 in the PWM control state, that is, the first MOS transistor Q1 is in the ON/OFF state at this time, and the second MOS transistor Q1 is in the non-operating state at this time.
When the first MOS transistor Q1 is turned on, the voltage of the negative electrode (hereinafter referred to as LED-) of the LED load module 3 is approximately equal to 0v, and when the first MOS transistor Q1 is turned off, the voltage of the LED is high.
As shown in table one, when the main switching circuit is operated and the redundant switching circuit is not operated, the signal detection module 13 may determine the state of the PWM switching unit 2 through the logic relationship of the PWM control signal and the LED-voltage signal.
List one
As shown in table one, when the first MOS transistor Q1 fails to form an open circuit, the LED load is in a closed state, and the signal detection module 13 detects that the circuit is abnormal 1; when the first MOS tube Q1 fails to form a short circuit, the LED load is in a full-lighting state, the circuit cannot adjust the brightness of the LED lamp, and the signal detection module 13 detects that the circuit is abnormal 2.
As shown in table two, when an abnormality occurs in the main switching circuit, the redundant switching circuit starts to handle the abnormality as a spare switching circuit, and the signal detection module 13 can determine the state of the PWM switching unit 2 by the logical relationship between the PWM control signal and the LED-voltage signal.
Watch II
As shown in table two, when the first MOS transistor Q1 is opened and the main switch circuit is abnormal 1, the PWM control signal module 12 stops transmitting the first signal PWM1 and transmits the second signal PWM2, so that the second MOS transistor Q2 operates normally, and the alarm module 14 outputs an alarm signal. When the first MOS transistor Q1 is shorted and the main switch circuit is abnormal 2, the PWM control signal module 12 stops transmitting the first signal PWM1 and the second signal PWM2, the LED load is in a full-bright state, and the alarm module 14 outputs an alarm signal.
Compared with the prior art, the PWM chopper dimming redundant circuit 100 is characterized in that the signal detection module and the alarm module are arranged in the control unit, and the redundant switch circuit connected with the main switch circuit in parallel is additionally arranged in the PWM switch unit, so that when the main switch circuit fails, the redundant switch circuit is used as a standby switch, and the LED load module cannot be turned off. In the scene of actually using LED illumination, for example, an indicator sign of a public space, a fire-fighting channel, a hospital, a factory, etc., the PWM chopper dimming redundancy circuit 100 of the present invention can effectively avoid accidents.
The invention relates to a chopping dimming method of a PWM chopping dimming redundant circuit 100, which comprises a control unit 1, an LED load module 3 connected with a direct current bus and a PWM switching unit 2 connected with the control unit 1 and the LED load module 3, wherein the control unit 1 comprises a power supply module 11, a PWM control signal module 12, a signal detection module 13 and an alarm module 14, and the PWM control signal module 12 can output a first signal PWM1 and a second signal PWM2. The PWM switching unit 2 includes a main switching circuit and a redundant switching circuit connected in parallel with the main switching circuit. The main switch circuit comprises a first MOS tube Q1 which can receive a first signal PWM 1. The redundant switch circuit comprises a second MOS tube Q2 which is connected with the first MOS tube Q1 in parallel and can receive a second signal PWM2. When the first MOS tube Q1 is not damaged, the PWM control signal module 12 outputs a first signal PWM1 to the first MOS tube Q1, the first MOS tube Q1 works and PWM dimming is carried out on the LED load module 3, the main switch circuit works normally, and the redundant switch circuit does not work; when the first MOS tube Q1 is opened, the main switch circuit is abnormal 1, the PWM control signal module 12 stops transmitting the first signal PWM1 and transmits the second signal PWM2 to the second MOS tube Q2, the second MOS tube Q2 works and carries out PWM dimming on the LED load module 3, the main switch circuit stops working, the redundant switch circuit works normally, and the alarm module 13 outputs an alarm signal; when the first MOS tube is short-circuited, the main switch circuit generates an abnormality 2, the PWM control signal module 12 stops transmitting the first signal PWM1 and the second signal PWM2, the LED load module 3 is in full-lighting operation, the main switch circuit and the redundant switch circuit stop operation, and the alarm module 13 outputs an alarm signal.
Compared with the prior art, the chopping dimming method of the PWM chopping dimming redundant circuit 100 has the advantages that the signal detection module and the alarm module are arranged in the control unit, and the redundant switch circuit connected with the main switch circuit in parallel is additionally arranged in the PWM switch unit, so that when the first MOS tube of the main switch circuit fails, the redundant switch circuit is used as a standby switch circuit, and the LED load module is prevented from being turned off. In the scene of actually using LED illumination, for example, an indicator sign of a public space, a fire-fighting channel, a hospital, a factory, etc., the chopper dimming method of the PWM chopper dimming redundant circuit 100 of the present invention can effectively avoid accidents.
As shown in fig. 3, the PWM chopper dimming redundancy circuit 200 of the second embodiment of the present invention has the same structure as the control unit 1 and the LED load module 3 of the PWM chopper dimming redundancy circuit 100 of the first embodiment, and is different in that the PWM control signal module 12 further includes a third signal output port 123 capable of transmitting a third signal PWM3, and the PWM switch unit 4 includes a main switch circuit, and a first redundancy switch circuit and a second redundancy switch circuit connected in parallel with the main switch circuit.
The main switch circuit comprises a first MOS tube Q1, wherein a grid electrode of the first MOS tube Q1 is connected with a first signal output port 121 of the PWM control signal module 2, a source electrode of the first MOS tube Q1 is connected with a cathode of the DCBUS, and a drain electrode of the first MOS tube Q1 is connected with a cathode of the signal detection module 13 and a cathode of the LED load module 3.
The first redundant switch circuit comprises a second MOS tube Q2, a grid electrode of the second MOS tube Q2 is connected with a second signal output port 122 of the PWM control signal module 12, a source electrode of the second MOS tube Q2 is connected with a cathode of the DCBUS, and a drain electrode of the second MOS tube Q2 is connected with a cathode of the signal detection module 13 and a cathode of the LED load module 3.
The second redundancy switch circuit comprises a third MOS tube Q3, a grid electrode of the third MOS tube Q3 is connected with a third signal output port 123 of the PWM control signal module 12, a source electrode of the third MOS tube Q3 is connected with a cathode of the DCBUS, and a drain electrode of the second MOS tube Q2 is connected with a cathode of the signal detection module 13 and a cathode of the LED load module 3.
The first redundant switch circuit and the second redundant switch circuit are both provided as standby circuits of the main switch circuit. The specific working principle is as follows:
when the first MOS transistor Q1 is not damaged, the PWM control signal module 12 outputs a first signal PWM1 to the first MOS transistor Q1, the first MOS transistor Q1 works and performs PWM dimming on the LED load module 3, the main switch circuit works normally, and the first redundant switch circuit and the second redundant switch circuit do not work.
When the first MOS transistor Q1 is opened, the main switch circuit is abnormal 1, the PWM control signal module 12 stops transmitting the first signal PWM1 and transmits the second signal PWM2 to the second MOS transistor Q2, the second MOS transistor Q2 works and performs PWM dimming on the LED load module 3, the main switch circuit stops working, the first redundant switch circuit works normally, and the alarm module 13 outputs an alarm signal.
When the first MOS transistor Q1 and the second MOS transistor Q2 are both open, the main switch circuit and the first redundant switch circuit are abnormal 1, the PWM control signal module 12 stops transmitting the first signal PWM1 and the second signal PWM2 and transmits the third signal PWM3 to the third MOS transistor Q3, the third MOS transistor Q3 works and performs PWM dimming on the LED load module 3, the main switch circuit and the first redundant switch circuit stop working, the second redundant switch circuit works normally, and the alarm module 13 outputs an alarm signal.
When the first MOS tube Q1 is short-circuited, the main switch circuit is abnormal 2, the PWM control signal module 12 stops transmitting any signal, the LED load module 3 is fully on, the main switch circuit and the redundant switch circuit stop working, and the alarm module 13 outputs an alarm signal.
When the first MOS tube Q1 and the second MOS tube Q2 are short-circuited, the main switch circuit generates an abnormality 2, the PWM control signal module 12 stops transmitting any signal, the LED load module 3 is fully on, the main switch circuit and the redundant switch circuit stop working, and the alarm module 13 outputs an alarm signal. Through the design, the LED load module can be fully prevented from being in a lamp-out condition, so that accidents are avoided.
In other embodiments, the PWM switching unit may further include a plurality of redundant switching circuits, thereby further increasing the reliability of the circuit.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be appreciated by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. The chopping dimming method of the PWM chopping dimming redundancy circuit comprises a control unit, an LED load module connected with a direct current bus and a PWM switching unit connected with the control unit and the LED load module, wherein the control unit comprises a power supply module, a PWM control signal module, a signal detection module and an alarm module, and is characterized in that: the PWM control signal module can output a first signal and a second signal, the PWM switch unit comprises a main switch circuit and a redundant switch circuit connected in parallel with the main switch circuit, the main switch circuit comprises a first MOS tube which can receive the first signal, the redundant switch circuit comprises a second MOS tube which is connected in parallel with the first MOS tube and can receive the second signal, when the first MOS tube is not damaged, the PWM control signal module outputs the first signal to the first MOS tube, the first MOS tube works and PWM dimming is carried out on the LED load module, the main switch circuit works normally, and the redundant switch circuit does not work; when the first MOS tube is opened, the main switch circuit is abnormal, the PWM control signal module stops transmitting the first signal and transmits the second signal to the second MOS tube, the second MOS tube works and PWM dimming is carried out on the LED load module, the main switch circuit stops working, the redundant switch circuit works normally, and the alarm module outputs an alarm signal; when the first MOS tube is short-circuited, the main switch circuit is abnormal, the PWM control signal module stops transmitting the first signal and the second signal, the LED load module is fully on, the main switch circuit and the redundant switch circuit stop working, and the alarm module outputs an alarm signal.
2. The chopper dimming method of a PWM chopper dimming redundancy circuit of claim 1, wherein the PWM control signal module comprises a first signal output port outputting the first signal and a second signal output port outputting the second signal.
3. The chopper dimming method of the PWM chopper dimming redundancy circuit according to claim 2, wherein a gate of the first MOS transistor is connected to the first signal output port, a source of the first MOS transistor is connected to a cathode of the dc bus, and a drain of the first MOS transistor is connected to a cathode of the signal detection module and a cathode of the LED load module.
4. The chopper dimming method of the PWM chopper dimming redundancy circuit according to claim 3, wherein a gate of the second MOS transistor is connected to the second signal output port, a source of the second MOS transistor is connected to a cathode of the dc bus, and a drain of the second MOS transistor is connected to a cathode of the signal detection module and a cathode of the LED load module.
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