CN212910120U - LED power supply dimming circuit - Google Patents
LED power supply dimming circuit Download PDFInfo
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- CN212910120U CN212910120U CN202021887470.1U CN202021887470U CN212910120U CN 212910120 U CN212910120 U CN 212910120U CN 202021887470 U CN202021887470 U CN 202021887470U CN 212910120 U CN212910120 U CN 212910120U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model belongs to the technical field of the power and specifically relates to a LED power dimmer circuit. The utility model provides a LED power supply dimmer circuit solves the constant voltage type LED power and adjusts luminance input signal compatibility and LED lamp load to multiple dimmer and the luminance unusual problem appears when the electricity is gone up or is closed to minimum luminance, further solves the switch and overflows the damage problem, reduces switching voltage stress, improves the reliability, contains signal conversion unit, electrical isolation unit, sequential control unit, switch drive unit, switch element and the LED lamp load that connects in order, and is further, contains switch protection unit and voltage spike absorption unit, switch protection unit and voltage spike absorption unit all connect the switch unit, the utility model is suitable for a dimming of LED power.
Description
Technical Field
The utility model belongs to the technical field of the power and specifically relates to a LED power dimmer circuit.
Background
In most lighting scenes, users expect that the illumination brightness of the light source can change along with the change of the ambient brightness, and the LED light source is one of the lighting sources with the best dimmable performance and is widely applied. At present, a dimmer for an LED power supply mainly takes three forms of 0-10V, variable resistance and PWM, the LED power supply expected by a user supports the three forms of dimmers as much as possible to meet the market diversification requirement, so that the requirement of the LED power supply for the compatibility of dimming input signals of various dimmers is improved, the constant-voltage LED power supply realizes dimming control by adopting a series switch between the constant-voltage LED power supply and an LED lamp load, and the abnormal phenomenon of the brightness can be caused when the LED light source is powered on or powered off at the lowest brightness. When the LED power supply is in a power-on state, the current exceeds the pulse current which can be borne by the switch when the load end of the LED lamp is in a short circuit state, so that the LED lamp is damaged, and the reliability of the LED power supply is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the LED power supply dimming circuit solves the problems that a constant-voltage LED power supply is compatible with dimming input signals of various dimmers and the brightness of an LED lamp load is abnormal when the LED lamp load is electrified or powered off at the lowest brightness, further solves the problem of switch overcurrent damage, reduces the voltage stress of a switch, and improves the reliability.
The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be: the utility model provides a LED power supply dimming circuit, includes signal conversion unit, electrical isolation unit, time sequence control unit, switch unit drive unit, switch unit, LED lamp load. The signal conversion unit is used for converting an externally input dimming signal into a uniform PWM signal as a control reference signal. The electric isolation unit isolates the control circuit from the signal conversion circuit, reduces the interference of the control circuit to the PWM signal, and enables the dimming signal input by the external dimmer to correspond to the control logic relation of the switch when the dimming signal is the minimum dimming brightness. The time sequence control unit is used for setting a control signal of the switch driving unit to be a low level when the power is on, so that abnormal brightness of the LED lamp load caused by mismatching of the working duty ratio of the switch and a dimmer signal when the power is on is prevented. The switch driving unit controls the on and off of the switch. The switch protection unit adopts a driving signal for switching off the switch when the detected load current exceeds a threshold value, so that the switch is protected, and the power supply is prevented from being damaged and burnt out during short circuit. The voltage peak absorption unit provides voltage peak suppression for the switch, reduces the voltage stress of the switch power device and improves the reliability.
Specifically, the signal conversion unit comprises a signal conversion chip and a first capacitor; the VIN pin of the signal conversion chip and one end of the first capacitor are connected to the positive pole of the 15V power supply, the other end of the first capacitor and the GND pin of the signal conversion chip are connected to the negative pole of the 15V power supply, the DIMI pin of the signal conversion chip is connected to the positive pole of the external dimming signal input, and the negative pole of the external dimming signal input is connected to the negative pole of the 15V power supply.
Specifically, the electrical isolation unit comprises a seventh resistor, a fourth resistor, a fifth NPN triode, a fourth NPN triode, and a photoelectric coupler; one end of a seventh resistor is connected with a DIMO pin of the signal conversion chip, the other end of a fourth resistor is connected with a base electrode of a fifth NPN triode, an emitting electrode of the fifth NPN triode is connected with a negative electrode of a 15V power supply, a collecting electrode of the fifth NPN triode is connected with one end of the fourth resistor and is connected with the base electrode of the fourth NPN triode, the other end of the fourth resistor is connected with a positive electrode of the 15V power supply, the emitting electrode of the fourth NPN triode is connected with a negative electrode of the 15V power supply, the collecting electrode of the fourth NPN triode is connected with a negative electrode of a light emitting diode of a photoelectric coupler, the positive electrode of the light emitting diode of the photoelectric coupler is connected with one end of the fifth resistor, and the.
Specifically, the time sequence control unit comprises a second resistor, a third resistor and a second NPN triode; one end of the second resistor is connected to the positive electrode of the 7V power supply, the other end of the second resistor is connected to the collector electrode of the phototriode of the photoelectric coupler and is connected to the base electrode of the second NPN triode, the emitter electrode of the phototriode of the photoelectric coupler is connected to the negative electrode of the 7V power supply, one end of the third resistor is connected to the positive electrode of the 7V power supply, the other end of the third resistor is connected to the collector electrode of the second NPN triode, and the emitter electrode of the second NPN triode is connected to the negative electrode of the 7.
Specifically, the switch driving unit comprises a third PNP triode, a first NPN triode, and a sixth resistor; the collector of the first NPN triode is connected to the positive pole of the 7V power supply, the base of the first NPN triode and the base of the third PNP triode are connected to the collector of the second NPN triode together, the emitter of the third PNP triode and the emitter of the first NPN triode are connected to one end of the sixth resistor together, and the collector of the third PNP triode is connected to the negative pole of the 7V power supply.
Specifically, the switch unit comprises an N-channel MOS tube and an eighth resistor; and the drain electrode of the N-channel MOS tube is connected to the negative electrode of the LED lamp load, the gate electrode of the N-channel MOS tube is connected to the other end of the sixth resistor and one end of the eighth resistor, and the other end of the eighth resistor is connected to the source electrode of the N-channel MOS tube.
A switch protection unit is further provided and is connected with the switch unit and comprises a ninth resistor, a tenth resistor, an eleventh resistor, a seventh PNP triode, an eighth NPN triode, a ninth PNP triode and a diode; one end of a ninth resistor is connected to the positive electrode of the 7V power supply, the other end of the ninth resistor is connected with the base electrode of the seventh PNP triode, the collector electrode of the eighth NPN triode and the base electrode of the ninth PNP triode together, the emitter electrode of the seventh PNP triode is connected with the positive electrode of the 7V power supply, the collector electrode of the seventh PNP triode is connected with the base electrode of the eighth NPN triode, the negative electrode of the diode and one end of an eleventh resistor together, the other end of the eleventh resistor is connected with the emitter electrode of the eighth NPN triode and the collector electrode of the ninth PNP triode together in a grounded mode, the emitter electrode of the ninth PNP triode is connected to the gate electrode of the N-channel MOS tube, the positive electrode of the diode is connected to the source electrode of the N-channel MOS.
Further providing a voltage spike absorption unit, wherein the voltage spike absorption unit is connected with the switch unit and comprises a first resistor and a second capacitor; one end of the first resistor is connected to the anode of the LED lamp load, the other end of the first resistor is connected to one end of the second capacitor, and the other end of the second capacitor is connected with the drain electrode of the N-channel MOS tube.
The utility model has the advantages that: compared with the prior art, the utility model realizes the compatibility of three dimming signals through the signal conversion unit; when the LED lamp load is powered on or powered off at the lowest brightness, the photoelectric coupler is in a cut-off state, the collector of a phototriode of the photoelectric coupler is at a high level, a driving signal obtained by the switch driving unit is at a low level, no signal is given to the switch unit, and the switch is cut off, so that the abnormal brightness phenomenon of the LED lamp load at the lowest brightness when the LED lamp load is powered on or powered off is overcome; further, through the switch protection unit, when the load of the LED lamp is broken, the switch unit is turned on, the voltage on the resistor exceeds a threshold value, the eighth NPN triode is conducted through the diode, the collector of the eighth NPN triode is at a low level, the seventh PNP triode and the ninth PNP triode are both conducted, the seventh PNP triode is conducted, the eighth NPN triode is continuously conducted, the ninth PNP triode is conducted and shut off a switch driving signal, the N-channel MOS tube is closed, and the problem that the switch is burnt down due to the short circuit of the load is solved; furthermore, the voltage spike absorption circuit unit reduces the voltage stress of the switch and improves the reliability.
Drawings
Fig. 1 is a frame diagram of a light-emitting diode (LED) power dimming circuit system of the present invention.
Fig. 2 is a circuit diagram of a specific embodiment of a light-emitting diode (LED) power dimming circuit of the present invention.
Detailed Description
As shown in fig. 1, the utility model provides a LED power dimmer circuit includes signal conversion unit, electrical isolation unit, sequential control unit, switch element drive unit, switch protection unit, switch element, voltage spike absorption unit, LED lamp load, signal conversion unit, electrical isolation unit, sequential control unit, switch element drive unit, switch element connect in order, switch protection unit and voltage spike absorption unit all connect the switch unit.
In a specific implementation, as shown in fig. 2, each part of the dimming circuit is implemented as follows:
the signal conversion unit is used for converting the dimming signal input by the external dimmer into a uniform PWM signal as a control reference signal. The signal conversion unit comprises a signal conversion chip U2 and a first capacitor C1; the VIN pin of the signal conversion chip U2 and one end of the first capacitor C1 are commonly connected to the positive pole of the 15V power supply, the other end of the first capacitor C1 and the GND pin of the signal conversion chip U2 are commonly connected to the negative pole of the 15V power supply, the dim i pin of the signal conversion chip U2 is connected to the positive pole of the external dimming signal input, and the negative pole of the external dimmer dimming signal input is connected to the negative pole of the 15V power supply. SY5867 is the signal conversion chip U2, and first electric capacity C1 is 0.1uF, and when the DIMI foot of SY5867 receives 0-10V variable voltage, the DIMO foot output 100-0% duty ratio change PWM.
The electric isolation unit isolates the control circuit from the signal conversion circuit, reduces the interference of the control circuit to the PWM signal, and enables the dimming signal input by the external dimmer to correspond to the control logic relation of the switch when the dimming signal is the minimum dimming brightness. The electrical isolation unit comprises a seventh resistor R7, a fourth resistor R4, a fifth resistor R5, a fifth NPN triode Q5, a fourth NPN triode Q4 and a photoelectric coupler U1; one end of a seventh resistor R7 is connected to a DIMO pin of the signal conversion chip U2, the other end of the fourth resistor R4 is connected to a base of a fifth NPN transistor Q5, an emitter of a fifth NPN transistor Q5 is connected to a negative electrode of the 15V power supply, a collector of a fifth NPN transistor Q5 is connected to one end of a fourth resistor R4 and is connected to a base of a fourth NPN transistor Q4, the other end of the fourth resistor R4 is connected to an anode of the 15V power supply, an emitter of the fourth NPN transistor Q4 is connected to a negative electrode of the 15V power supply, a collector of the fourth NPN transistor Q4 is connected to a negative electrode of a light emitting diode of the photocoupler U1, an anode of the light emitting diode of the photocoupler U1 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected to an anode of the 15. The seventh resistor R7 is 1 kilo-ohm, the fourth resistor R4 is 47 kilo-ohm, the fifth resistor R5 is 5.1 kilo-ohm, the fifth NPN triode Q5 is MMBT3904, the fourth NPN triode Q4 is MMBT3904, the photoelectric coupler U1 is EL817S, and when the base of the fifth NPN triode Q5 is at a high level, the photoelectric coupler EL817S is cut off.
The time sequence control is used for setting a control signal of the switch driving unit to be a low level during power-on, so that abnormal brightness of the LED lamp load caused by mismatching of the working duty ratio of the switch during power-on and a dimmer signal is prevented. The timing control unit comprises a second resistor R2, a third resistor R3 and a second NPN triode Q2; one end of a second resistor R2 is connected to the positive electrode of a 7V power supply, the other end of the second resistor R2 is connected to the collector of a phototriode of a photoelectric coupler U1 and the base of a second NPN triode Q2, the emitter of the phototriode of the photoelectric coupler U1 is connected to the negative electrode of the 7V power supply, one end of a third resistor R3 is connected to the positive electrode of the 7V power supply, the other end of a third resistor R3 is connected to the collector of the second NPN triode Q2, and the emitter of the second NPN triode Q2 is connected to the negative electrode of the 7V power supply. The second resistor R2 is 10 kohms, the third resistor R3 is 5.1 kohms, and the second NPN transistor Q2 is MMBT 3904. When the circuit realizes that the photoelectric coupler EL817S is cut off, the second NPN triode Q2 is always in a conducting state, and the collector voltage of the second NPN triode Q2 is at a low level.
The switch driving unit controls the on and off of the switch. The switch driving unit comprises a third PNP triode Q3, a first NPN triode Q1 and a sixth resistor R6; the collector of the first NPN triode Q1 is connected to the positive pole of the 7V power supply, the base of the first NPN triode Q1 and the base of the third PNP triode Q3 are connected to the collector of the second NPN triode Q2, the emitter of the third NPN triode Q3 and the emitter of the first NPN triode Q1 are connected to one end of the sixth resistor R6, and the collector of the third PNP triode Q3 is connected to the negative pole of the 7V power supply. The third PNP transistor Q3 is MMBT3906, the first NPN transistor Q1 is MMBT3904, and the sixth resistor R6 is 100 ohms. When the circuit realizes that the collector of the second NPN triode Q2 is at a low level, there is no control signal at the sixth resistor R6.
The switch unit is used for controlling the on and off of the LED lamp load. The switch unit comprises an N-channel MOS transistor Q6 and an eighth resistor R8; the drain of the N-channel MOS transistor Q6 is connected to the cathode of the LED lamp load, the gate of the N-channel MOS transistor Q6 is connected to the other end of the sixth resistor R6 and to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is connected to the source of the N-channel MOS transistor Q6. An N-channel MOS transistor Q6 is an MCU20N06, and an eighth resistor R8 is 10 kilo-ohms. When the circuit realizes that the sixth resistor R6 has no control signal, the N-channel MOS tube MCU20N06 is closed, and the LED lamp load is cut off.
The switch protection unit adopts a driving signal for switching off the switch when the detected load current exceeds a threshold value, so that the switch is protected, and the power supply is prevented from being damaged and burnt out during short circuit. The switch protection unit is connected with the switch unit and comprises a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a seventh PNP triode Q7, an eighth NPN triode Q8, a ninth PNP triode Q9 and a diode D1; one end of a ninth resistor R9 is connected to the positive electrode of the 7V power supply, the other end of the ninth resistor R9 is commonly connected to the base of the seventh PNP transistor Q7, the collector of the eighth NPN transistor Q8, and the base of the ninth PNP transistor Q9, the emitter of the seventh PNP transistor Q7 is connected to the positive electrode of the 7V power supply, the collector of the seventh PNP transistor Q7 is commonly connected to the base of the eighth NPN transistor Q8, the cathode of the diode D1, and one end of an eleventh resistor R11, the other end of the eleventh resistor R11 is commonly connected to the emitter of the eighth NPN transistor Q8 and the collector of the ninth PNP transistor Q9, the emitter of the ninth PNP transistor Q9 is connected to the gate of the N-channel MOS Q6, the positive electrode of the diode D1 is connected to the source of the N-channel MOS Q6 and commonly connected to one end of a tenth resistor R1, and the other end of the tenth resistor R10 is grounded. The ninth resistor R9 is 1 kilo-ohm, the tenth resistor R10 is 20 milli-ohms, the eleventh resistor R11 is 1 kilo-ohm, the seventh PNP transistor Q7 is MMBT3906, the eighth NPN transistor Q8 is MMBT3904, the ninth PNP transistor Q9 is MMBT3906, and the diode D1 is 1N 4148. The Vbe voltage of the seventh NPN triode is 0.3V, VF of the diode is 0.3V, when the load current threshold is near 30A, the eighth NPN triode Q8 is turned on, the collector of the eighth NPN triode Q8 is at a low level, the seventh PNP triode Q7 and the ninth PNP triode Q9 are both turned on, the seventh PNP triode is turned on to continuously turn on the eighth NPN triode Q8, the ninth NPN triode Q9 is turned on and off the switch driving signal, and the N-channel MOS Q6 is turned off, so that the protection release requires the LED power supply system to cut off the input power supply, and the load end is prevented from being damaged by repeated current abnormality.
The voltage peak absorption unit provides voltage peak suppression for the switch, and the voltage stress at two ends of the switch is reduced by utilizing the RC damped oscillation principle, so that the reliability is improved. The voltage spike absorption unit is connected with the switch unit and comprises a first resistor R1 and a second capacitor C2; one end of the first resistor R1 is connected to the anode of the LED lamp load, the other end of the first resistor R1 is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is connected to the drain of the N-channel MOS transistor Q6. The first resistor R1 is 10 ohms and the second capacitor C2 is 10 nF.
Claims (8)
1. An LED power supply dimming circuit, its characterized in that: the LED lamp driving circuit comprises a signal conversion unit, an electrical isolation unit, a time sequence control unit, a switch unit driving unit, a switch unit and an LED lamp load which are connected in sequence.
2. The LED power dimming circuit of claim 1, wherein: the signal conversion unit comprises a signal conversion chip (U2) and a first capacitor (C1); the VIN pin of the signal conversion chip (U2) and one end of the first capacitor (C1) are connected to the positive pole of the 15V power supply in common, the other end of the first capacitor (C1) and the GND pin of the signal conversion chip (U2) are connected to the negative pole of the 15V power supply in common, the DIMI pin of the signal conversion chip (U2) is connected to the positive pole of the external dimming signal input, and the negative pole of the external dimmer dimming signal input is connected to the negative pole of the 15V power supply.
3. The LED power dimming circuit of claim 2, wherein: the electric isolation unit comprises a seventh resistor (R7), a fourth resistor (R4), a fifth resistor (R5), a fifth NPN triode (Q5), a fourth NPN triode (Q4) and a photoelectric coupler (U1); one end of a seventh resistor (R7) is connected with a DIMO pin of the signal conversion chip (U2), the other end of the seventh resistor (R7) is connected with a base electrode of a fifth NPN triode (Q5), an emitter electrode of the fifth NPN triode (Q5) is connected with a negative electrode of a 15V power supply, a collector electrode of the fifth NPN triode (Q5) is connected with one end of a fourth resistor (R4) and is connected with a base electrode of the fourth NPN triode (Q4), the other end of the fourth resistor (R4) is connected with a positive electrode of the 15V power supply, an emitter electrode of the fourth NPN triode (Q4) is connected with a negative electrode of the 15V power supply, a collector electrode of the fourth NPN triode (Q4) is connected with a negative electrode of a light emitting diode of a photoelectric coupler (U1), a positive electrode of the light emitting diode of the photoelectric coupler (U1) is connected with one end of a fifth resistor (R5), and the other end of the fifth resistor (R5.
4. The LED power supply dimming circuit of claim 3, wherein: the timing control unit comprises a second resistor (R2), a third resistor (R3) and a second NPN triode (Q2); one end of a second resistor (R2) is connected to the positive electrode of a 7V power supply, the other end of the second resistor (R2) is connected to the collector of a phototriode of a photoelectric coupler (U1) and is connected to the base of a second NPN triode (Q2), the emitter of the phototriode of the photoelectric coupler (U1) is connected to the negative electrode of the 7V power supply, one end of a third resistor (R3) is connected to the positive electrode of the 7V power supply, the other end of the third resistor (R3) is connected to the collector of the second NPN triode (Q2), and the emitter of the second NPN triode (Q2) is connected to the negative electrode of the 7V power supply.
5. The LED power supply dimming circuit of claim 4, wherein: the switch driving unit comprises a third PNP triode (Q3), a first NPN triode (Q1) and a sixth resistor (R6); the collector of the first NPN triode (Q1) is connected to the positive pole of the 7V power supply, the base of the first NPN triode (Q1) and the base of the third PNP triode (Q3) are connected to the collector of the second NPN triode (Q2) in common, the emitter of the third PNP triode (Q3) and the emitter of the first NPN triode (Q1) are connected to one end of the sixth resistor (R6) in common, and the collector of the third PNP triode (Q3) is connected to the negative pole of the 7V power supply.
6. The LED power supply dimming circuit of claim 5, wherein: the switch unit comprises an N-channel MOS (Q6) and an eighth resistor (R8); the drain electrode of the N-channel MOS tube (Q6) is connected to the negative electrode of the LED lamp load, the gate electrode of the N-channel MOS tube (Q6) is connected to the other end of the sixth resistor (R6) and one end of the eighth resistor (R8), and the other end of the eighth resistor (R8) is connected to the source electrode of the N-channel MOS tube (Q6).
7. The LED power supply dimming circuit of claim 6, wherein: the dimming circuit further comprises a switch protection unit; the switch protection unit is connected with the switch unit and comprises a ninth resistor (R9), a tenth resistor (R10), an eleventh resistor (R11), a seventh PNP triode (Q7), an eighth NPN triode (Q8), a ninth PNP triode (Q9) and a diode (D1); one end of a ninth resistor (R9) is connected to the positive electrode of the 7V power supply, the other end of the ninth resistor (R9) is commonly connected to the base of a seventh PNP transistor (Q7), the collector of an eighth NPN transistor (Q8) and the base of a ninth PNP transistor (Q9), the emitter of the seventh PNP transistor (Q7) is connected to the positive electrode of the 7V power supply, the collector of the seventh PNP transistor (Q7) is commonly connected to the base of the eighth NPN transistor (Q8), the cathode of a diode (D1) and one end of an eleventh resistor (R11) are commonly connected together, the other end of the eleventh resistor (R11) is commonly connected to the ground with the emitter of the eighth NPN transistor (Q8) and the collector of the ninth NPN transistor (Q9), the emitter of the ninth PNP transistor (Q9) is connected to the gate of an N-channel MOS transistor (Q6), the positive electrode of the diode (D1) is connected to the source of the N-channel MOS transistor (Q6) and commonly connected to the tenth end of the resistor (R10), the other end of the tenth resistor (R10) is grounded.
8. The LED power dimming circuit of claim 7, wherein: the dimming circuit further comprises a voltage spike absorption unit; the voltage spike absorption unit is connected with the switch unit and comprises a first resistor (R1) and a second capacitor (C2); one end of the first resistor (R1) is connected to the anode of the LED lamp load, the other end of the first resistor (R1) is connected to one end of the second capacitor (C2), and the other end of the second capacitor (C2) is connected with the drain electrode of the N-channel MOS tube (Q6).
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| CN202021887470.1U CN212910120U (en) | 2020-09-02 | 2020-09-02 | LED power supply dimming circuit |
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| CN202021887470.1U CN212910120U (en) | 2020-09-02 | 2020-09-02 | LED power supply dimming circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117007959A (en) * | 2023-09-27 | 2023-11-07 | 四川虹锐电工有限责任公司 | Relay action response time test system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117007959A (en) * | 2023-09-27 | 2023-11-07 | 四川虹锐电工有限责任公司 | Relay action response time test system |
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