CN214046076U - LED drive power supply circuit capable of outputting wide voltage range - Google Patents
LED drive power supply circuit capable of outputting wide voltage range Download PDFInfo
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Abstract
The utility model discloses a LED drive power supply circuit of wide voltage range of output. The problem that the voltage range of the whole LED driving output is limited due to the fact that the output voltage range is limited by the first-stage output voltage due to the connection mode of two-stage output is solved; the utility model comprises a rectifying and filtering module, a power conversion module, a DC/DC module and an LED load which are connected in sequence, and a first voltage acquisition module, a second voltage acquisition module and a voltage regulation module; the input end of the first voltage acquisition module is connected with the output end of the DC/DC module, the output end of the first voltage acquisition module is connected with the first input end of the voltage regulation module, the input end of the second voltage acquisition module is connected with the output end of the power conversion module, the output end of the second voltage acquisition module is connected with the second input end of the voltage regulation module, and the output end of the voltage regulation module is connected with the feedback end of the power conversion module. The circuit maintains a constant relationship between the voltage output from the first stage and the voltage of the load, and outputs a wide voltage.
Description
Technical Field
The utility model relates to a LED drive power supply field especially relates to a LED drive power supply circuit of wide voltage range of output.
Background
With the vigorous popularization of energy-saving products in China, the DC power supply and the LED driver have higher market demands, and meanwhile, higher requirements are put on the diversification of matched loads, so that the LED driving power supply is expected to be bought, and different lamps can be connected with the LED driving power supply.
Because the lighting equipment is expected to have no stroboflash and high power factor at present, the LED driving power supply adopts a two-stage output mode. Generally, a structure of a first-stage constant voltage output and a latter-stage constant current output is adopted, for example, a structure disclosed in chinese patent document "a full-voltage high-power LED driving secondary circuit anti-flash back circuit", which is disclosed in publication No. CN105554961A, includes a first-stage constant voltage circuit and a secondary constant current circuit connected in sequence, a first capacitor for stabilizing a power supply is connected in the first-stage constant voltage circuit, a second capacitor for stabilizing the power supply is connected in the secondary constant current circuit, a voltage dividing circuit is connected in parallel to two ends of the first capacitor, an anode of the second capacitor is connected to a discharging circuit, an electronic switch is arranged in the discharging circuit, a control end of the electronic switch is connected to an output end of the voltage dividing circuit, one end of a conduction path of the electronic switch is connected to an anode of the second capacitor, and one end of the conduction path is grounded.
The connection mode of the two-stage output can cause the voltage range of the LED driving output to be limited by the first-stage output voltage, so that the voltage range of the whole LED driving output is limited. For example, if the second stage is a BOOST output, the voltage of the constant voltage output of the first stage is required to be less than the voltage of the load, and if the second stage is a BUCK output, the voltage of the output of the first stage is required to be greater than the voltage of the load.
Disclosure of Invention
The utility model mainly solves the problem that the voltage range of the whole LED driving output is limited due to the limitation of the first-stage output voltage caused by the connection mode of the two-stage output in the prior art; the LED driving power supply circuit with wide output voltage range is provided, the voltage output by the first stage is controlled by sampling the voltage output by the first stage constant voltage and comparing the voltage with the voltage of the load, so that the voltage output by the first stage and the voltage of the load keep a certain relation, the normal work of the second stage is ensured, and the wide voltage is output.
The above technical problem of the present invention can be solved by the following technical solutions:
an LED driving power circuit outputting a wide voltage range comprises a rectifying and filtering module, a power conversion module, a DC/DC module and an LED load which are sequentially connected, and further comprises a first voltage acquisition module, a second voltage acquisition module, a voltage regulation module and a signal processing module; the input end of the first voltage acquisition module is connected with the output end of the DC/DC module, the output end of the first voltage acquisition module is connected with the first input end of the voltage regulation module, the input end of the second voltage acquisition module is connected with the output end of the power conversion module, the output end of the second voltage acquisition module is connected with the second input end of the voltage regulation module, the output end of the voltage regulation module is connected with the input end of the signal processing module, and the output end of the signal processing module is connected with the feedback end of the power conversion module.
According to the scheme, multiple functional modules are combined together, and the LED driving can be adapted to lamps with different voltages through the logic control relation of the modules. Taking the BOOST circuit as an example of the DC/DC module of the second stage, in order to operate the DC/DC module normally, the voltage Vled of the LED load is required to be greater than the output voltage Vo1 of the power conversion module of the first stage, in operation, the first Voltage acquisition module samples the Voltage output by the LED drive to output a first sampling Voltage Vsense1, the second Voltage acquisition module samples the output Voltage of the power conversion module at the first stage to output a second sampling Voltage Vsense2 to the Voltage regulation module, once the Voltage regulation module (Voltage regulator) detects that Vsense1 is smaller than Vsense2, the Voltage regulation module outputs a control Voltage Vctr1, the power conversion module outputs a corresponding Voltage Vo1 according to different control voltages, therefore, the voltage output by the power conversion module is less than the voltage of the LED, so that the second-stage DC/DC module can work normally when the lamps with different voltages are connected at the output, and the whole device is suitable for lamps with very wide voltage.
Preferably, the signal processing module comprises an optical coupler US31, and the signal processing module is used for isolating the control signal between the voltage regulation module and the power conversion module.
The control voltage Vctr1 outputs a control Signal Vctr2 through a Signal processing module (Signal processing), and the power conversion module outputs a corresponding voltage Vo1 according to different control signals Vctr2, so as to ensure that the voltage output by the power conversion module is less than the voltage of the LED.
Preferably, the signal processing module comprises an optical coupler US31, a resistor RS74, a resistor RS35A, a resistor RS35B, a resistor RS35 and a capacitor CS 35; the anode of the light emitting diode in the optical coupler US31 is connected with the output end of the voltage adjusting module, and the cathode of the light emitting diode in the optical coupler US31 is grounded; a collector of a triode in the optocoupler US31 is connected with a power supply VDD, an emitter of the triode in the optocoupler US31 is connected with a first end of a resistor RS35A, a second end of the resistor RS35A is connected with a first end of a capacitor CS35, a second end of the capacitor CS35 is grounded, a first end of a resistor RS35B is connected with a first end of a resistor RS35A, and a second end of the resistor RS35B is grounded; the first end of the resistor RS35 is connected with the second end of the resistor RS35A, and the second end of the resistor RS35 is used as the output end of the signal processing module and is connected with the feedback end of the power conversion module.
In order to convert Vctr1 into a signal Vctr2 that can be recognized by the first-stage power conversion module, because the first-stage power conversion module is isolated and output, in order to meet the requirement of isolation, an optical coupling sensor is added, Vctr1 is converted into an optical signal, and after the received optical signal is converted into a voltage (Vctr 2) of 0 to 10V, the first-stage power conversion module adjusts and outputs Vo1 according to the signal Vctr2, thereby ensuring the stable operation of the system.
Preferably, the voltage regulation module comprises an operational amplifier US91B, a resistor RS93, a resistor RS92B and a capacitor CS 91; the first end of the resistor RS93 is connected with the inverting input end of the operational amplifier US91B, and the second end of the resistor RS93 is used as the first input end of the voltage regulation module; a first end of the resistor RS92B is connected with a non-inverting input end of the operational amplifier US91B, and a second end of the resistor RS92B is used as a second input end of the voltage regulation module; the first end of the capacitor CS91 is connected with the inverting input end of the operational amplifier US91B, the second end of the capacitor CS91 is connected with the output end of the operational amplifier US91B, and the output end of the operational amplifier US91B is used as the output end of the voltage regulation module.
The voltage adjusting module integrates the Vsense1 and the Vsense2, when the Vsense2 is larger than the Vsense1, a voltage of 0-10V is output, if the time that the Vsense2 is larger than the Vsense1 exceeds a certain time, Vctr1 always outputs 10V, and if the Vsense2 is smaller than the Vsense1, Vctr1 always outputs 0V. The relationship of Vsense2 to Vsense1 is converted to Vctr1 by the voltage regulation module.
Preferably, the first voltage acquisition module is a differential amplification circuit, and the first voltage acquisition module comprises an operational amplifier US91A, a resistor RS94, a resistor RS9A, a resistor RS95 and a resistor RS 96; the first end of the resistor RS95 is connected with the negative output end of the DC/DC module, the second end of the resistor RS95 is connected with the inverting input end of the operational amplifier US91A, the first end of the resistor RS96 is connected with the positive input end of the DC/DC module, the second end of the resistor RS96 is connected with the non-inverting input end of the operational amplifier US91A, the first end of the resistor RS9A is connected with the second end of the resistor RS96, the second end of the resistor RS9A is grounded, the first end of the resistor RS94 is connected with the inverting input end of the operational amplifier US91A, the second end of the resistor RS91A is connected with the output end of the operational amplifier US91A, and the input end of the operational amplifier US91A is the output end of the first voltage acquisition module.
In order to solve the problem that the Vled and the voltage regulating module are not in common ground, a differential amplifying circuit is adopted to convert the Vled voltage into a Vsense1 voltage received by the regulator. By adjusting the resistance inside, the ratio of Vled voltage to Vsense1 is changed.
Preferably, the second voltage acquisition module is a resistor voltage-dividing circuit, the second voltage acquisition module includes a resistor RS92C and a resistor RS92D, a first end of the resistor RS92C is connected to the output end of the power conversion module, a second end of the resistor RS92C is connected to a first end of the resistor RS92D, a second end of the resistor RS92D is grounded, and a connection point of the resistor RS92C and the resistor RS92D serves as the output end of the second voltage acquisition module. The second sampling module samples the voltage Vo1, outputs Vsense2 through resistance voltage division, and adjusts the proportional relation between the resistance value change Vo1 and Vsense2 of the resistor.
The utility model has the advantages that:
1. the voltage output by the first stage is controlled by sampling and comparing the voltage output by the first stage with the voltage of the load, so that the voltage output by the first stage and the voltage of the load keep a certain relation, the normal work of the second stage is ensured, the DC/DC module of the second stage can work normally when being connected with lamps with different voltages, and the whole device is suitable for lamps with a wide voltage range.
2. The integrator is used as a power conversion module to compare the first-stage output voltage with the load voltage, and the control voltage is excessively gentle, so that the regulated voltage is stabilized at a balance voltage.
Drawings
Fig. 1 is a block diagram of a circuit principle connection structure of the present invention.
Fig. 2 is a circuit connection diagram of the rectifying and filtering module and the power conversion module of the present invention.
Fig. 3 is a circuit connection diagram of the LED driving power circuit module according to the present invention.
In the figure, 1, a rectifying and filtering module, 2, a power conversion module, 3, a DC/DC module, 4, an LED load, 5, a first voltage acquisition module, 6, a second voltage acquisition module, 7, a voltage regulation module and 8, a signal processing module are arranged.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.
Example (b):
as shown in fig. 1, fig. 2 and fig. 3, the LED driving power circuit with a wide output voltage range of this embodiment includes a rectifying and filtering module 1, a power conversion module 2, a DC/DC module 3 and an LED load 4, which are connected in sequence, and further includes a first voltage acquisition module 5, a second voltage acquisition module 6, a voltage regulation module 7 and a signal processing module 8.
The input end of the first voltage acquisition module 5 is connected with the output end of the DC/DC module 3, and the output end of the first voltage acquisition module 5 is connected with the first input end of the voltage regulation module 7; the input end of the second voltage acquisition module 6 is connected with the output end of the power conversion module 2, and the output end of the second voltage acquisition module 6 is connected with the second input end of the voltage regulation module 7; the output end of the voltage regulating module 7 is connected with the input end of the signal processing module 8, and the output end of the signal processing module 8 is connected with the feedback end of the power conversion module 2.
The power conversion module in this embodiment is a flyback power circuit commonly used in the art, the power conversion module 2 includes a constant voltage chip US11, and the feedback terminal of the power conversion module 2 is a voltage feedback pin of the constant voltage chip US 11.
The first voltage acquisition module 5 is a differential amplification circuit. The first voltage acquisition module comprises an operational amplifier US91A, a resistor RS94, a resistor RS9A, a resistor RS95, a resistor RS96 and a resistor RS 95A.
The first end of the resistor RS95 is connected with the negative output end of the DC/DC module 3, the second end of the resistor RS95 is connected with the inverting input end of the operational amplifier US91A, the first end of the resistor RS95A is connected with the second end of the resistor RS95, and the second end of the resistor RS95A is grounded; the first end of the resistor RS96 is connected with the positive input end of the DC/DC module 3, the second end of the resistor RS96 is connected with the non-inverting input end of the operational amplifier US91A, the first end of the resistor RS9A is connected with the second end of the resistor RS96, and the second end of the resistor RS9A is grounded; the first end of the resistor RS94 is connected with the inverting input end of the operational amplifier US91A, the second end of the resistor RS91A is connected with the output end of the operational amplifier US91A, and the input end of the operational amplifier US91A is the output end of the first voltage acquisition module.
In order to solve the problem that the voltage Vled of the LED load 4 is not grounded to the voltage regulating module 7, a differential amplifier circuit is used to convert the Vled voltage into a first sampled voltage Vsense1 received by the regulating module 7. By adjusting the resistance, the ratio of Vled to Vsense1 is changed.
The second voltage acquisition module 6 is a resistance voltage division circuit. The second voltage acquisition module comprises a resistor RS92C and a resistor RS 92D.
The first end of the resistor RS92C is connected to the output end of the power conversion module 2, the second end of the resistor RS92C is connected to the first end of the resistor RS92D, the second end of the resistor RS92D is grounded, the resistor RS92D is further connected in parallel with the capacitor CS92, and the connection between the resistor RS92C and the resistor RS92D serves as the output end of the second voltage acquisition module 6.
The second sampling module 6 samples the output voltage Vo1 of the power conversion module 2 of the first stage, outputs the second sampled voltage Vsense2 through resistance voltage division, and adjusts the proportional relation between the resistance value change Vo1 and Vsense2 of the resistor.
The voltage regulation module 7 is an integrator. The voltage regulation module 7 comprises an operational amplifier US91B, a resistor RS93, a resistor RS92B and a capacitor CS 91.
The first end of the resistor RS93 is connected with the inverting input end of the operational amplifier US91B, and the second end of the resistor RS93 is used as the first input end of the voltage regulating module 7 and is connected with the output end of the operational amplifier US 91A; a first end of the resistor RS92B is connected with a non-inverting input end of the operational amplifier US91B, and a second end of the resistor RS92B is used as a second input end of the voltage regulating module 6 and is connected with a first end of the resistor RS 92D; the first end of the capacitor CS91 is connected to the inverting input terminal of the operational amplifier US91B, the second end of the capacitor CS91 is connected to the output terminal of the operational amplifier US91B, and the output terminal of the operational amplifier US91B is used as the output terminal of the voltage regulation module 7.
The voltage adjusting module 7 integrates the first sampling voltage Vsense1 with the second sampling voltage Vsense2, and when the second sampling voltage Vsense2 is greater than the first sampling voltage Vsense1, a voltage of 0 to 10V is output, if the time that the second sampling voltage Vsense2 is greater than the first sampling voltage Vsense1 exceeds a certain time, the control voltage Vctr1 output by the voltage adjusting module 7 will always output 10V, and if the second sampling voltage Vsense2 is less than the first sampling voltage Vsense1, the control voltage Vctr1 output by the voltage adjusting module 7 will always output 0V.
The relationship between the second sampled voltage Vsense2 and the first sampled voltage Vsense1 is converted into the control voltage Vctr1 by the voltage regulation module 7. And the voltage sampling module 7 adopts an integrator to compare the first-stage output voltage Vo1 with the load voltage Vled, and the control voltage is excessively gentle, so that the regulated voltage is stabilized at a balanced voltage.
The signal processing module 8 is used for isolating signals, and the signal processing module 8 comprises an optical coupler US31, a resistor RS74, a resistor RS35A, a resistor RS35B, a resistor RS35 and a capacitor CS 35.
The anode of the light emitting diode in the optical coupler US31 is connected with the output end of the voltage regulating module 7, namely the output end of the operational amplifier US91B, and the cathode of the light emitting diode in the optical coupler US31 is grounded; a collector of a triode in the optocoupler US31 is connected with a power supply VDD, an emitter of the triode in the optocoupler US31 is connected with a first end of a resistor RS35A, a second end of the resistor RS35A is connected with a first end of a capacitor CS35, a second end of the capacitor CS35 is grounded, a first end of a resistor RS35B is connected with a first end of a resistor RS35A, and a second end of the resistor RS35B is grounded; a first end of the resistor RS35 is connected to a second end of the resistor RS35A, and a second end of the resistor RS35 is connected to the feedback end of the power conversion module 2 as the output end of the signal processing module 8.
In order to convert the control voltage Vctr1 into the control signal Vctr2 that can be recognized by the first-stage power conversion module, because the first-stage power conversion module 2 is isolated for output, in order to meet the requirement of isolation, an optical coupler is added, the control voltage Vctr1 is firstly converted into an optical signal, and after the received optical signal is converted into the voltage control signal Vctr2 of 0 to 10V, the first-stage power conversion module 2 adjusts the first-stage output voltage Vo1 according to the control signal Vctr2, thereby ensuring the stable operation of the system.
When the power supply is turned on, the constant voltage chip US11 in the power conversion module 2 works, the DC/DC module 3 does not work, the control signal Vctr2 outputs a high level, and the flyback power circuit of the first stage outputs a low voltage Vo1, so that it can be ensured that the LED load 4 does not light when the DC/DC module 3 of the rear stage does not work.
When the second stage DC/DC module 3 works, the voltage Vled of the LED load 4 rises, the first sampling voltage Vsense1 rises, the control voltage Vctr1 becomes lower, the control signal Vctr2 becomes lower, and the constant voltage chip US11 detects that the control signal Vctr2 becomes lower, so as to raise the first stage output voltage Vo1, thereby ensuring the normal work of the DC/DC module 3.
During the operation, the voltage of the voltage Vled of the LED load 4 outputs a first sampling voltage Vsense1 through a differential amplification circuit formed by an operational amplifier US91A, the first sampling voltage Vsense1 and a second sampling voltage Vsense2 output by the first stage output voltage Vo1 through resistance voltage division output a control voltage Vctr1 of 0-10V through an integration circuit formed by an operational amplifier US91B, and the control voltage Vctr1 isolates and outputs a control signal Vctr2 through an optical coupler US 31. The constant voltage chip US11 in the power conversion module 2 detects different control signals Vctr2, and controls to output different first stage output voltages Vo 1.
When the voltage Vled of the LED load 4 rises, the first sampling voltage Vsense1 output by the first stage output voltage Vled through the differential circuit is greater than the second sampling voltage Vsense2 output by the first stage output voltage Vo1 through the voltage dividing resistor, the control voltage Vctr1 output by the operational amplifier US91B decreases, and along with the decrease of the control signal Vctr2, the constant voltage chip US11 in the power conversion module 2 detects that the control signal Vctr2 decreases, so that the first stage output voltage Vo1 is controlled to rise, and the normal operation of the subsequent stage DC/DC module 3 is ensured.
On the contrary, when the voltage of the voltage Vled of the LED load 4 decreases, the first sampling voltage Vsense1 output by the voltage Vled of the LED load 4 through the differential circuit is smaller than the second sampling voltage Vsense2 output by the first-stage output voltage Vo1 through the voltage dividing resistor, the control voltage Vctr1 output by the operational amplifier US91B increases, and the voltage of the control signal Vctr2 increases along with the increase, so that the constant-voltage core US11 in the power conversion module 2 controls the decrease of the first-stage output voltage Vo1, and the normal operation of the subsequent-stage DC/DC module 3 is ensured.
In the embodiment, multiple functional modules are combined together, and the LED driving can be adapted to lamps with different voltages through the logic control relation of the modules. The voltage output by the first stage is controlled by sampling and comparing the voltage output by the first stage with the voltage of the LED load, so that the voltage output by the first stage and the voltage of the LED load keep a certain relation, the normal work of the second stage DC/DC module is ensured, the second stage DC/DC module can work normally when being connected with lamps with different voltages, and the whole device is suitable for lamps with a wide voltage range.
It should be understood that the examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.
Claims (6)
1. An LED driving power circuit outputting a wide voltage range comprises a rectifying and filtering module (1), a power conversion module (2), a DC/DC module (3) and an LED load (4) which are sequentially connected, and is characterized by further comprising a first voltage acquisition module (5), a second voltage acquisition module (6), a voltage regulation module (7) and a signal processing module (8); the input end of the first voltage acquisition module (5) is connected with the output end of the DC/DC module (3), the output end of the first voltage acquisition module (5) is connected with the first input end of the voltage regulation module (7), the input end of the second voltage acquisition module (6) is connected with the output end of the power conversion module (2), the output end of the second voltage acquisition module (6) is connected with the second input end of the voltage regulation module (7), the output end of the voltage regulation module (7) is connected with the input end of the signal processing module (8), and the output end of the signal processing module (8) is connected with the feedback end of the power conversion module (2).
2. The LED driving power supply circuit outputting a wide voltage range according to claim 1, wherein the signal processing module (8) comprises an optical coupler US31, and the signal processing module (8) is used for isolating the control signal between the voltage regulating module (7) and the power conversion module (2).
3. The LED driving power supply circuit outputting a wide voltage range according to claim 2, wherein the signal processing module (8) comprises an optical coupler US31, a resistor RS74, a resistor RS35A, a resistor RS35B, a resistor RS35 and a capacitor CS 35; the anode of the light emitting diode in the optical coupler US31 is connected with the output end of the voltage adjusting module (7), and the cathode of the light emitting diode in the optical coupler US31 is grounded; a collector of a triode in the optocoupler US31 is connected with a power supply VDD, an emitter of the triode in the optocoupler US31 is connected with a first end of a resistor RS35A, a second end of the resistor RS35A is connected with a first end of a capacitor CS35, a second end of the capacitor CS35 is grounded, a first end of a resistor RS35B is connected with a first end of a resistor RS35A, and a second end of the resistor RS35B is grounded; the first end of the resistor RS35 is connected with the second end of the resistor RS35A, and the second end of the resistor RS35 is used as the output end of the signal processing module (8) and is connected with the feedback end of the power conversion module (2).
4. The power supply circuit for driving LED according to claim 1, 2 or 3, wherein the voltage regulating module (7) is an integrator, and the voltage regulating module (7) comprises an operational amplifier US91B, a resistor RS93, a resistor RS92B and a capacitor CS 91; the first end of the resistor RS93 is connected with the inverting input end of the operational amplifier US91B, and the second end of the resistor RS93 is used as the first input end of the voltage regulation module (7); a first end of the resistor RS92B is connected with a non-inverting input end of the operational amplifier US91B, and a second end of the resistor RS92B is used as a second input end of the voltage regulation module; the first end of the capacitor CS91 is connected with the inverting input end of the operational amplifier US91B, the second end of the capacitor CS91 is connected with the output end of the operational amplifier US91B, and the output end of the operational amplifier US91B is used as the output end of the voltage regulation module (7).
5. The LED driving power supply circuit outputting a wide voltage range according to claim 4, wherein the first voltage acquisition module (5) is a differential amplifier circuit, and the first voltage acquisition module (5) comprises an operational amplifier US91A, a resistor RS94, a resistor RS9A, a resistor RS95 and a resistor RS 96; the first end of the resistor RS95 is connected with the negative output end of the DC/DC module (3), the second end of the resistor RS95 is connected with the inverting input end of the operational amplifier US91A, the first end of the resistor RS96 is connected with the positive input end of the DC/DC module (3), the second end of the resistor RS96 is connected with the non-inverting input end of the operational amplifier US91A, the first end of the resistor RS9A is connected with the second end of the resistor RS96, the second end of the resistor RS9A is grounded, the first end of the resistor RS94 is connected with the inverting input end of the operational amplifier US91A, the second end of the resistor RS91A is connected with the output end of the operational amplifier US91A, and the input end of the operational amplifier US91A is the output end of the first voltage acquisition module (5).
6. The LED driving power supply circuit capable of outputting a wide voltage range according to claim 4, wherein the second voltage acquisition module (6) is a resistor voltage divider circuit, the second voltage acquisition module (6) comprises a resistor RS92C and a resistor RS92D, a first end of the resistor RS92C is connected to the output end of the power conversion module (2), a second end of the resistor RS92C is connected to a first end of the resistor RS92D, a second end of the resistor RS92D is grounded, and a connection point of the resistor RS92C and the resistor RS92D is used as the output end of the second voltage acquisition module (6).
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| CN112601324A (en) * | 2020-12-11 | 2021-04-02 | 浙江凯耀照明有限责任公司 | LED drive power supply circuit capable of outputting wide voltage range |
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| CN112601324A (en) * | 2020-12-11 | 2021-04-02 | 浙江凯耀照明有限责任公司 | LED drive power supply circuit capable of outputting wide voltage range |
| CN112601324B (en) * | 2020-12-11 | 2023-02-17 | 浙江凯耀照明有限责任公司 | LED drive power supply circuit capable of outputting wide voltage range |
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