CN109526105A - A kind of LED drive power of isolation shutdown output voltage - Google Patents
A kind of LED drive power of isolation shutdown output voltage Download PDFInfo
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- CN109526105A CN109526105A CN201811550245.6A CN201811550245A CN109526105A CN 109526105 A CN109526105 A CN 109526105A CN 201811550245 A CN201811550245 A CN 201811550245A CN 109526105 A CN109526105 A CN 109526105A
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- 239000003990 capacitor Substances 0.000 claims description 47
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- 239000004065 semiconductor Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 239000011324 bead Substances 0.000 description 3
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- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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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
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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]
- H05B45/10—Controlling the intensity of the light
Abstract
The invention discloses a kind of LED drive powers of isolation shutdown output voltage comprising has a constant current unit, a Voltage loop control unit, a voltage reference cell, an isolated buck unit and a PWM control unit.The constant current unit, for providing working power for LED load；The Voltage loop control unit exports a feedback signal according to loop reference voltage and the comparison result of comparison voltage from the output end sampled voltage of the constant current unit to obtain comparison voltage；The voltage reference cell, for providing loop reference voltage for the Voltage loop control unit；The isolated buck unit receives a cut-off signals and adjusts the loop reference voltage according to the cut-off signals, and for the cut-off signals to be isolated with the output of the constant current unit；The PWM control unit, for controlling the output voltage of the constant current unit according to the feedback signal.
Description
Technical field
The present invention relates to LED drive power technical fields more particularly to a kind of LED of isolation shutdown output voltage to drive electricity
Source.
Background technique
In LED application, LED lamp bead has a unlatching threshold values, the lamp bead just meeting when only voltage reaches unlatching threshold values
It lights, when voltage is opening threshold voltage hereinafter, lamp bead will not be bright.In the application of Dimmable LED constant-current supply, LED electricity
Source would generally have (0~10V/PWM signal) dimming control function.
In existing Dimmable LED constant-current supply application, there are following several situations when 0V for 0-10V light modulation:
When first, 0V it is corresponding be 1V current value, that is, maximum current 10%, can not turn off, there are also 10% by LED
Brightness.This kind of scheme is that the dim signal of 0-10V is adjusted to current loop control unit by adjusting control circuit to come
Change output electric current, in order to prevent not flashing light between 0-1V, the current value of 0-1V is usually passed through into brightness adjustment control current internal
It is set in 10%.This kind of scheme can not turn off LED luminance, also have 10% brightness, will cause the waste of electric power resource, current
Not in the demand for being generally applicable in market in the case where stringent to environmental protection and horsepower requirements, and light modulation end and power output end not every
From the mandatory requirement of current CCC certification not being able to satisfy, in addition, light adjusting circuit and output are not isolated for applying secure context
There are hidden danger.
It can be turned off when second, 0V, dim end and power output end is not isolated.This kind of scheme is done in the first scheme
It is promoted, dim signal is done into respective handling by adjusting adjusting control circuit, it can be achieved that when 0V turns off LED, but this kind of scheme
And light modulation end and power output end are not isolated, and are not able to satisfy the mandatory requirement of current CCC certification.
Third, when 0V, can turn off, and in 1 metal-oxide-semiconductor shutdown output of output end, but have fine leak after metal-oxide-semiconductor shutdown
Electric current flows through metal-oxide-semiconductor, and LED can see faint bright under dark situations, not thoroughly shutdown.This kind of scheme is will to dim letter
Number switching circuit is converted by control circuit to control the switch situation of metal-oxide-semiconductor, is realized by metal-oxide-semiconductor switch state defeated
It turns off out.But it still has very small part leakage current due to there is the presence of internal resistance and parasitic capacitance after metal-oxide-semiconductor shutdown and passes through
Metal-oxide-semiconductor.The realization shutdown of this scheme not truly, metal-oxide-semiconductor have faint in the still visible LED in dark place after turning off
Light will cause the waste of electric power resource；And this scheme light modulation end and output end are also not isolation, are not able to satisfy current
The mandatory requirement of CCC certification.
Summary of the invention
Technical problem to be solved by the present invention lies in provide one kind can thoroughly turn off LED luminance and be able to satisfy newest safety
The LED drive power for the isolation shutdown output voltage that the security isolation of standard requires.
In order to solve the above technical problems, the present invention uses technical solution as described below:
A kind of LED drive power of isolation shutdown output voltage comprising have a constant current unit, Voltage loop control single
Member, a voltage reference cell, an isolated buck unit and a PWM control unit.The constant current unit, for being mentioned for LED load
For working power；The Voltage loop control unit, from the output end sampled voltage of the constant current unit to obtain comparison voltage,
A feedback signal is exported according to loop reference voltage and the comparison result of comparison voltage；The voltage reference cell is used for as institute
It states Voltage loop control unit and loop reference voltage is provided；The isolated buck unit receives a cut-off signals and according to described
Cut-off signals adjust the loop reference voltage, and for by the output of the cut-off signals and the constant current unit carry out every
From；The PWM control unit, for controlling the output voltage of the constant current unit according to the feedback signal.
Preferably, the voltage reference cell includes three-terminal voltage-stabilizing pipe U1, triode Q2, resistance R3, resistance R4 and electricity
R5 is hindered, the collector of the triode Q2, one end of resistance R3 connect power supply VCC, and the other end of resistance R3 connects three pole
The base stage of pipe Q2 and the cathode of three-terminal voltage-stabilizing pipe U1, the emitter of the triode Q2 are connect with one end of resistance R4, and described three
The emitter of pole pipe Q2 also passes through resistance R9 and connect with the Voltage loop control unit, the other end and three-terminal voltage-stabilizing pipe of resistance R4
One end connection of the reference pole, resistance R5 of U1, the plus earth of the other end and three-terminal voltage-stabilizing pipe U1 of resistance R5.
Preferably, the voltage reference cell further includes having capacitor C2, and the one end the capacitor C2 is connected to the triode
The emitter of Q2, other end ground connection.
Preferably, the model TL431 of the three-terminal voltage-stabilizing pipe U1.
Preferably, the isolated buck unit includes optocoupler U4, resistance R10 and the one end resistance R11, the resistance R11
Outer signal source, the resistance R11 other end are connect with the anode of the luminous tube of optocoupler U4, the minus earth of the luminous tube of optocoupler U4,
The one end the resistance R10 connects the Voltage loop control unit, and the resistance R10 other end and the collector of the photosensitive tube of optocoupler U4 connect
It connects, the emitter ground connection of the photosensitive tube of optocoupler U4.
Preferably, the isolated buck unit further includes having capacitor C5, and the one end the capacitor C5 is connected to the resistance R10
With the connecting node between the Voltage loop control unit, other end ground connection.
Preferably, the Voltage loop control unit includes operational amplifier IC2, resistance R7, resistance R12, resistance R13, electricity
Resistance R14, resistance R15 and capacitor C4, one end of the resistance R13 are connect with the output end of the constant current unit, and resistance R13's is another
One end is grounded after passing sequentially through resistance R12, resistance R14, resistance R15, the connection section between the resistance R12 and resistance R14
Point connects the inverting input terminal of the operational amplifier IC2, and the normal phase input end of the operational amplifier IC2 connects the isolation
Pressure unit, the normal phase input end of the operational amplifier IC2 also pass through R9 and connect the voltage reference cell, and the operation is put
For the output end of big device IC2 by the resistance R7 connection PWM control unit, the one end the capacitor C4 connects the operational amplifier
The inverting input terminal of IC2, capacitor C4 other end ground connection.
Preferably, the Voltage loop control unit further includes resistance R8 and capacitor C3, and the one end resistance R8 connects the operation
The output end of amplifier IC2, the resistance R8 other end are connect with one end of capacitor C3, and the other end of capacitor C3 connects the operation and puts
The inverting input terminal of big device IC2.
Preferably, it is described isolation shutdown output voltage LED drive power further include having an auxiliary power unit, for for
The voltage reference cell, Voltage loop control unit and PWM control unit provide working power VCC.
Preferably, the auxiliary power unit include transformer T1, resistance R1, resistance R2, capacitor C1, diode D1,
One end of voltage-stabiliser tube ZD1 and triode Q1, the resistance R1 connect transformer T1, the other end connection diode D1 sun of resistance R1
Pole, diode D1 cathode are connect with one end of capacitor C1 anode, triode Q1 collector, resistance R2 respectively, and resistance R2's is another
End is connect with triode Q1 base stage, voltage-stabiliser tube ZD1 cathode, voltage-stabiliser tube ZD1 anode, capacitor C1 cathode ground connection, triode Q1 transmitting
Pole is connect with the voltage reference cell, Voltage loop control unit and PWM control unit respectively.
The beneficial technical effect of the present invention lies in: the LED drive power of above-mentioned isolation shutdown output voltage is dropped by isolation
Unit is pressed to adjust the loop reference voltage for changing Voltage loop control unit, to realize the mesh for reducing the output voltage of constant current unit
, the thorough shutdown of the brightness of LED lamp is realized, the skill of brightness of LED lamp can not thoroughly be turned off by solving the prior art
Art problem.In addition, also cut-off signals are isolated with output voltage by isolated buck unit, newest safety standard is met
Security isolation requirement.
Detailed description of the invention
Fig. 1 is the functional block diagram of the LED drive power of isolation shutdown output voltage of the invention；
Fig. 2 is the circuit diagram of the voltage reference cell and auxiliary power unit in Fig. 1；
Fig. 3 be Fig. 1 in Voltage loop control unit, isolated buck unit and PWM control unit circuit diagram.
Specific embodiment
To make those skilled in the art that the object, technical solutions and advantages of the present invention be more clearly understood, with
Under the present invention is further elaborated in conjunction with the accompanying drawings and embodiments.
As shown in Figure 1, in an embodiment of the invention, the LED drive power of isolation shutdown output voltage includes one
Constant current unit 10, a Voltage loop control unit 20, a voltage reference cell 30, an isolated buck unit 40 and PWM control are single
Member 50.The constant current unit 10, for providing working power for LED load 60.The Voltage loop control unit 20, from described
The output end sampled voltage of constant current unit 10 is to obtain comparison voltage, according to the comparison result of loop reference voltage and comparison voltage
Export a feedback signal.The voltage reference cell 30, for providing loop reference voltage for the Voltage loop control unit 20.
The isolated buck unit 40, receives a cut-off signals and according to the adjusting of the cut-off signals loop reference voltage,
And for the cut-off signals to be isolated with the output voltage of the constant current unit 10.The PWM control unit 50, is used for
The output voltage of the constant current unit 10 is controlled according to the feedback signal.
The LED drive power of isolation shutdown output voltage in the present embodiment, when being input to the isolated buck unit 40
Cut-off signals variation when, the loop reference voltage of the voltage reference cell 30 changes therewith, passes through isolated buck unit 40
The loop reference voltage for changing Voltage loop control unit 20 is adjusted, so that the output voltage of the constant current unit 10 is reduced to foot
Enough low (opening threshold value lower than LED), to thoroughly turn off the brightness of LED load 60, solving the prior art can not thoroughly be turned off
The technical issues of brightness of LED lamp.In addition, also passing through isolated buck unit 40 for the output of cut-off signals and constant current unit 10
Voltage is isolated, and the security isolation requirement of newest safety standard is met.
As shown in Figure 1, the LED drive power of the isolation shutdown output voltage further includes having an auxiliary power unit 70,
For providing working power for the voltage reference cell 30, Voltage loop control unit 20 and PWM control unit 50.
Fig. 2 shows the circuit diagrams of voltage reference cell 30 of the invention and auxiliary power unit 70.Such as Fig. 2 institute
Show, the auxiliary power unit 70 include transformer T1, resistance R1, resistance R2, capacitor C1, diode D1, voltage-stabiliser tube ZD1 and
One end of triode Q1, the resistance R1 connect transformer T1, and the other end of resistance R1 connects diode D1 anode, diode D1
Cathode is connect with one end of capacitor C1 anode, triode Q1 collector, resistance R2 respectively, the other end and triode Q1 of resistance R2
Base stage, voltage-stabiliser tube ZD1 cathode connection, voltage-stabiliser tube ZD1 anode, capacitor C1 cathode ground connection, triode Q1 emitter respectively with it is described
Voltage reference cell 30, Voltage loop control unit 20 and PWM control unit 50 connect.The auxiliary power unit 70 is by transformer
T1 charges after resistance R1, diode D1 rectification to capacitor C1, and voltage stabilization exists using voltage-stabiliser tube ZD1 and triode Q1
VCC powers to the voltage reference cell 30, Voltage loop control unit 20 and PWM control unit 50, and resistance R2 is for limiting stream
Cross the electric current of voltage-stabiliser tube ZD1.
As shown in Fig. 2, the voltage reference cell 30 include the three-terminal voltage-stabilizing pipe U1 of model TL431, triode Q2,
Capacitor C2, resistance R3, the collector of resistance R4 and resistance R5, the triode Q2, resistance R3 one end connect power supply VCC, electricity
The other end of resistance R3 connects the base stage of the triode Q2 and the cathode of three-terminal voltage-stabilizing pipe U1, the emitter point of the triode Q2
It is not connect with one end of resistance R4, capacitor C2, the emitter of the triode Q2 also passes through resistance R9 and the Voltage loop controls
Unit connection, the other end of resistance R4 are connect with one end of the reference pole of three-terminal voltage-stabilizing pipe U1, resistance R5, and resistance R5's is another
The plus earth at end, the other end of capacitor C2 and three-terminal voltage-stabilizing pipe U1.The voltage reference cell 30 is auxiliary power unit 70
Output voltage VCC through triode Q2, three-terminal voltage-stabilizing pipe U1, resistance R4 and resistance R5 divide and capacitor C2 High frequency filter after provide
One reference voltage Vref, reference voltage Vref are connected to the Voltage loop control unit 20 by resistance R9, are the electricity
Pressure ring control unit 20 provides loop reference voltage, and the resistance R3 is for limiting the electric current for flowing through three-terminal voltage-stabilizing pipe U1.
Fig. 3 shows the circuit of Voltage loop control unit 20 of the invention, isolated buck unit 40 and PWM control unit 50
Schematic diagram.As shown in figure 3, the Voltage loop control unit 20 includes operational amplifier IC2, resistance R7, resistance R12, resistance
R13, resistance R14, resistance R15 and capacitor C4, one end of the resistance R13 are connect with the output end of the constant current unit 10, electricity
The other end of resistance R13 is grounded after passing sequentially through resistance R12, resistance R14, resistance R15, between the resistance R12 and resistance R14
Connecting node connect the inverting input terminal of the operational amplifier IC2, the normal phase input end of the operational amplifier IC2 passes through
The output end of the resistance R9 connection voltage reference cell 30, the operational amplifier IC2 passes through the resistance R7 connection PWM control
Unit 50 processed, the one end the capacitor C4 connect the inverting input terminal of the operational amplifier IC2, capacitor C4 other end ground connection.Institute
Stating Voltage loop control unit 20 further includes that resistance R8 and capacitor C3, the resistance R8 and capacitor C3 form the Voltage loop control
The feedback network of unit 20 processed, the one end resistance R8 connect the output end of the operational amplifier IC2, the resistance R8 other end and capacitor
One end of C3 connects, and the other end of capacitor C3 connects the inverting input terminal of the operational amplifier IC2.
The isolated buck unit 40 includes optocoupler U4, capacitor C5, resistance R10 and resistance R11, the resistance R11 mono-
Outer signal source (input OFF signal) is held, the resistance R11 other end is connect with the anode of the luminous tube of optocoupler U4, the hair of optocoupler U4
The minus earth of light pipe, the one end the resistance R10 are separately connected one end of the Voltage loop control unit 20 and capacitor C5, resistance
The R10 other end is connect with the collector of the photosensitive tube of optocoupler U4, and the other end of capacitor C5, the emitter of the photosensitive tube of optocoupler U4 connect
Ground.
The PWM control unit 50 includes PWM controller IC1, optocoupler U2, diode D2, when the Voltage loop controls
When the comparison voltage of unit 20 is higher than loop reference voltage, operational amplifier IC2 exports low level, and diode D2 is connected, so that
Optocoupler U2 exports certain electric current and is given to PWM controller IC1, and PWM controller IC1 exports a pwm signal after receiving the electric current,
The output voltage of the constant current unit 10 is adjusted by pwm signal, so that the voltage (ratio of operational amplifier IC2 inverting input terminal
Compared with voltage) be reduced to it is equal with loop reference voltage, to realize the control of 10 output voltage Vout of constant current unit.
The working principle of the LED drive power of isolation shutdown output voltage provided by the invention is as follows:
When normal dimming state: the auxiliary power unit 70 is given after resistance R1, diode D1 rectification by transformer T1
Capacitor C1 charging gives voltage stabilization to the voltage reference cell 30, voltage in VCC using voltage-stabiliser tube ZD1 and triode Q1
The operational amplifier IC2 of ring control unit 20 powers.Also output voltage VCC gives the voltage to the auxiliary power unit 70 simultaneously
Reference cell 30, voltage VCC is divided through triode Q2, three-terminal voltage-stabilizing pipe U1, resistance R4 and resistance R5 and capacitor C2 High frequency filter
One reference voltage Vref is provided afterwards, reference voltage Vref is connected to operational amplifier IC2 normal phase input end by resistance R9,
Loop reference voltage is provided for the Voltage loop control unit 20.Voltage loop control unit 20 passes through the output end of constant current unit 10
V0ut takes voltage to filter to obtain comparison voltage by capacitor C4 after resistance R13, R12, R14, R15 partial pressure and input to operation amplifier
Device IC2 inverting input terminal.Cut-off signals (OFF signal) input the on-off of optocoupler U4 in isolation drop voltage cell 40 by R11.When
Normal light modulation, when not requiring shutdown, cut-off signals (OFF signal) are low level, and optocoupler U4, which does not work, to be not turned on, and resistance R10 is made
To current path is not formed between ground, then reference voltage Vref is through R9 to the voltage of operational amplifier IC2 normal phase input end
It immobilizes always, it is constant to be able to maintain stablizing for the output voltage V0ut of constant current unit 10.
When off state: when requiring shutdown, cut-off signals (OFF signal) become high level, and optocoupler U4 conducting has electricity
Stream flows through optocoupler U4, then R10 forms a current path to ground, by this method relative to by operational amplifier IC2 positive
The voltage pull-down of input terminal plays the role of reducing loop reference voltage, to pass through Voltage loop control unit 20 for constant current list
The output voltage V0ut of member 10 is reduced to desired voltage (opening threshold value lower than LED), to thoroughly turn off the bright of LED load 60
Degree.
The above description is only a preferred embodiment of the present invention, rather than does limitation in any form to the present invention.This field
Technical staff can impose various equivalent changes and improvement, all institutes within the scope of the claims on the basis of the above embodiments
The equivalent variations or modification done, should all fall under the scope of the present invention.
Claims (10)
1. a kind of LED drive power of isolation shutdown output voltage, which is characterized in that include:
One constant current unit, for providing working power for LED load；
One Voltage loop control unit, from the output end sampled voltage of the constant current unit to obtain comparison voltage, according to loop
Reference voltage and the comparison result of comparison voltage export a feedback signal；
One voltage reference cell, for providing loop reference voltage for the Voltage loop control unit；
One isolated buck unit receives a cut-off signals and adjusts the loop reference voltage according to the cut-off signals, and
For the cut-off signals to be isolated with the output of the constant current unit；
One PWM control unit, for controlling the output voltage of the constant current unit according to the feedback signal.
2. the LED drive power of isolation shutdown output voltage as described in claim 1, which is characterized in that the voltage reference
Unit includes three-terminal voltage-stabilizing pipe U1, triode Q2, resistance R3, resistance R4 and resistance R5, collector, the electricity of the triode Q2
The one end for hindering R3 connects power supply VCC, and the other end of resistance R3 connects the base stage of the triode Q2 and the yin of three-terminal voltage-stabilizing pipe U1
The emitter of pole, the triode Q2 is connect with one end of resistance R4, the emitter of the triode Q2 also pass through resistance R9 with
The Voltage loop control unit connection, the other end of resistance R4 are connect with one end of the reference pole of three-terminal voltage-stabilizing pipe U1, resistance R5,
The plus earth of the other end and three-terminal voltage-stabilizing pipe U1 of resistance R5.
3. the LED drive power of isolation shutdown output voltage as claimed in claim 2, which is characterized in that the voltage reference
Unit further includes having capacitor C2, and the one end the capacitor C2 is connected to the emitter of the triode Q2, other end ground connection.
4. the LED drive power of isolation shutdown output voltage as claimed in claim 2 or claim 3, which is characterized in that three end is steady
The model TL431 of pressure pipe U1.
5. the LED drive power of isolation shutdown output voltage as described in claim 1, which is characterized in that the isolated buck
Unit includes optocoupler U4, resistance R10 and one end outer signal source resistance R11, the resistance R11, the resistance R11 other end and light
The anode of the luminous tube of coupling U4 connects, the minus earth of the luminous tube of optocoupler U4, and the one end the resistance R10 connects the Voltage loop
Control unit, the resistance R10 other end are connect with the collector of the photosensitive tube of optocoupler U4, and the emitter of the photosensitive tube of optocoupler U4 connects
Ground.
6. the LED drive power of isolation shutdown output voltage as claimed in claim 5, which is characterized in that the isolated buck
Unit further includes having capacitor C5, and the one end the capacitor C5 is connected between the resistance R10 and the Voltage loop control unit
Connecting node, other end ground connection.
7. the LED drive power of isolation shutdown output voltage as described in claim 1, which is characterized in that the Voltage loop control
Unit processed includes operational amplifier IC2, resistance R7, resistance R12, resistance R13, resistance R14, resistance R15 and capacitor C4, the electricity
Resistance R13 one end connect with the output end of the constant current unit, the other end of resistance R13 pass sequentially through resistance R12, resistance R14,
It is grounded after resistance R15, the connecting node between the resistance R12 and resistance R14 connects the reverse phase of the operational amplifier IC2
The normal phase input end of input terminal, the operational amplifier IC2 connects the isolated buck unit, the operational amplifier IC2's
Normal phase input end also passes through R9 and connects the voltage reference cell, and the output end of the operational amplifier IC2 is connected by resistance R7
The PWM control unit is connect, the one end the capacitor C4 connects the inverting input terminal of the operational amplifier IC2, and capacitor C4 is another
End ground connection.
8. the LED drive power of isolation shutdown output voltage as claimed in claim 7, which is characterized in that the Voltage loop control
Unit processed further includes resistance R8 and capacitor C3, and the one end resistance R8 connects the output end of the operational amplifier IC2, and resistance R8 is another
End is connect with one end of capacitor C3, and the other end of capacitor C3 connects the inverting input terminal of the operational amplifier IC2.
9. the LED drive power of isolation shutdown output voltage as described in claim 1, which is characterized in that the isolation shutdown
The LED drive power of output voltage further includes having an auxiliary power unit, for controlling for the voltage reference cell, Voltage loop
Unit and PWM control unit provide working power VCC.
10. the LED drive power of isolation shutdown output voltage as claimed in claim 9, which is characterized in that the auxiliary power supply
Unit includes transformer T1, resistance R1, resistance R2, capacitor C1, diode D1, voltage-stabiliser tube ZD1 and triode Q1, the resistance
One end of R1 connects transformer T1, and the other end of resistance R1 connects diode D1 anode, diode D1 cathode respectively with capacitor C1
One end connection of anode, triode Q1 collector, resistance R2, the other end and triode Q1 base stage, the voltage-stabiliser tube ZD1 yin of resistance R2
Pole connection, voltage-stabiliser tube ZD1 anode, capacitor C1 cathode ground connection, triode Q1 emitter respectively with the voltage reference cell, voltage
Ring control unit is connected with PWM control unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811550245.6A CN109526105B (en) | 2018-12-18 | 2018-12-18 | LED driving power supply for isolating and switching off output voltage |
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| CN201811550245.6A CN109526105B (en) | 2018-12-18 | 2018-12-18 | LED driving power supply for isolating and switching off output voltage |
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| CN109526105B CN109526105B (en) | 2024-02-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112689358A (en) * | 2020-12-30 | 2021-04-20 | 浙江凯耀照明有限责任公司 | BOOST constant current circuit with no-load protection |
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| WO2016045566A1 (en) * | 2014-09-22 | 2016-03-31 | Byd Company Limited | Driving apparatus for led lamp and led |
| US20170231041A1 (en) * | 2015-11-02 | 2017-08-10 | Shenzhen Skyworth-Rgb Electronic Co., Ltd. | Constant voltage and current synchronic output power supply and television |
| CN209488868U (en) * | 2018-12-18 | 2019-10-11 | 深圳茂硕电子科技有限公司 | A kind of LED drive power of isolation shutdown output voltage |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112689358A (en) * | 2020-12-30 | 2021-04-20 | 浙江凯耀照明有限责任公司 | BOOST constant current circuit with no-load protection |
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