CN109168216A - Constant-power LED drive circuit and LED drive power - Google Patents
Constant-power LED drive circuit and LED drive power Download PDFInfo
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- CN109168216A CN109168216A CN201811070446.6A CN201811070446A CN109168216A CN 109168216 A CN109168216 A CN 109168216A CN 201811070446 A CN201811070446 A CN 201811070446A CN 109168216 A CN109168216 A CN 109168216A
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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]
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Abstract
The present invention relates to Constant-power LED drive circuit and LED drive power, which includes that AC-DC conversion circuit, benchmark initialization circuit, current sampling circuit, voltage sampling circuit, signal processing circuit and invariable power adjust circuit；The positive output end of AC-DC conversion circuit is separately connected the input terminal of benchmark initialization circuit and the input terminal of voltage sampling circuit, the input terminal of the negative output terminal connection current sampling circuit of AC-DC conversion circuit；The input terminal of the current reference end connection signal processing circuit of benchmark initialization circuit, the voltage input end of the voltage reference end connection voltage sampling circuit of benchmark initialization circuit；After the output end connection of the output end and voltage sampling circuit of current sampling circuit, reconnect the first input end that invariable power adjusts circuit；The output end connection invariable power of signal processing circuit adjusts the second input terminal of circuit；Invariable power adjusts the feedback end that circuit is also connected with AC-DC conversion circuit.Constant power output can be achieved in the present invention, improves power supply suitable application area.
Description
Technical field
The present invention relates to the technical fields of driving power, drive more specifically to Constant-power LED drive circuit and LED
Dynamic power supply.
Background technique
In daily life, be used to will be available commercially as AC power source (Tathagata in general for power supply unit
From the alternating current of commercial power socket) be converted into DC power supply, be supplied to electrical installation come using.For example, using in PC
In power supply unit switch technology be based on using switching device switch operate to provide the direct current of a variety of predetermined preparations
Output voltage.This kind of power supply units commonly referred to as switchs (or switch type) power supply unit.
LED drive power refers to the power supply unit that an extraneous electric energy is converted to secondary electric energy required for LED.LED
The inputing power of driving power includes alternating current and direct current, and exporting electric energy can generally change with LED forward voltage and be changed
The constant current of time variant voltage.LED drive power is mainly used in LED illumination, LED display and LED backlight field, wherein LED
Illumination requires highest for Drive Control Technique, is that most important application field, market prospects are the widest at present for LED drive power
It is wealthy.The stability of driving power quality is the key factor of LED illumination lamp service life.
Since LED lamp industry lacks unified standard, thus the string of lamp bead, and quantitative design be all major producer voluntarily
It determines, this has been resulted in, and the LED lamp mould group that most producer designs is all different, this gives the versatility and matching of power supply
Property bring very big challenge, the power supply that often most client uses all is to have different output voltage and output constant current value
Requirement, to special power source factory production when bring great inconvenience.
Existing constant-power power source technology mainly by artificial one voltage range of setting, then goes adjustment to export
Current value, then by the artificial power for removing to calculate the voltage exported and obtaining multiplied by electric current, determine whether to have exceeded power supply most
Big output power value.
Traditional LED power output is divided to two current constant control, Isobarically Control independent units, in adjustment output constant current size
When, Isobarically Control is unaffected, and because the current specification of client lamps and lanterns is had nothing in common with each other, product in design is intended to that client is facilitated to answer
With reserved current adjustment is adjusted, when output electric current tunes up, because voltage is constant, there is overpower to apply in use
Risk.
In addition, using single-chip microcontroller invariable power circuit, due to single-chip microcontroller in severe electromagnetic environment and open air can not be pre-
The temperature environment known is likely to the phenomenon that will cause program fleet, or causes the reset issues of single-chip microcontroller, this is always to go
Problem in industry.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, providing a kind of invariable power LED drive
Dynamic circuit and LED drive power.
The technical solution adopted by the present invention to solve the technical problems is: constructing a kind of Constant-power LED drive circuit, wraps
It includes: AC-DC conversion circuit, benchmark initialization circuit, current sampling circuit, voltage sampling circuit, signal processing circuit and permanent function
Rate adjusts circuit；
The positive output end of the AC-DC conversion circuit is separately connected the input terminal and the voltage of the benchmark initialization circuit
The negative output terminal of the input terminal of sample circuit, the AC-DC conversion circuit connects the input terminal of the current sampling circuit；It is described
The current reference end of benchmark initialization circuit connects the input terminal of the signal processing circuit, the voltage base of the benchmark initialization circuit
Quasi- end connects the voltage input end of the voltage sampling circuit；The output end of the current sampling circuit and voltage sample electricity
After the output end connection on road, reconnect the first input end that the invariable power adjusts circuit；The output of the signal processing circuit
End connects the second input terminal that the invariable power adjusts circuit；The invariable power adjusts circuit and is also connected with the AC-DC conversion electricity
The feedback end on road；
The AC-DC conversion circuit is for converting alternating current to direct current and extremely loading the direct current electricity output, institute
It states benchmark initialization circuit and is used for defeated to the AC-DC conversion circuit is acquired for generating reference signal, the current sampling circuit
Current signal and enhanced processing out, and the current signal of enhanced processing is exported to the invariable power and adjusts circuit；The electricity
Pressure sample circuit is used to acquire the voltage signal of the AC-DC conversion circuit output and exports voltage signal collected to institute
It states invariable power and adjusts circuit, the light adjusting circuit is used to receive and handle dim signal and dim signal transmits by treated
To the signal processing circuit, the signal processing circuit is used to receive the reference signal of the benchmark initialization circuit output and defeated
Direct current signal to the invariable power adjusts circuit out；The invariable power adjusts circuit and is used for according to the received current signal of institute, electricity
Signal, DC signal output feedback signal to the AC-DC conversion circuit are pressed, so that the AC-DC conversion circuit keeps permanent function
Rate output.
Preferably, further includes: the light adjusting circuit being connect with the signal processing circuit；
The light adjusting circuit is used to receive and handle dim signal and dim signal is sent to the signal by treated
Processing circuit.
Preferably, the benchmark initialization circuit includes: linear voltage-stabilizing circuit, voltage generation circuit, reference signal generation electricity
Road；
The input terminal of the linear voltage-stabilizing circuit connects the positive output end of the AC-DC conversion circuit, the linear voltage stabilization
The output end of circuit connects the input terminal of the voltage generation circuit, and the output end of the voltage generation circuit connects the benchmark
First output end of the input terminal of signal generating circuit, the reference signal generation circuit connects the defeated of the signal processing circuit
Enter end, the second output terminal of the reference signal generation circuit connects the reference voltage terminal of the voltage sampling circuit；
The input terminal of the linear voltage-stabilizing circuit is the input terminal of the benchmark initialization circuit, and the reference signal generates electricity
First output end on road is the current reference end of the benchmark initialization circuit, the second output terminal of the reference signal generation circuit
For the voltage reference end of the benchmark initialization circuit.
Preferably, the linear voltage-stabilizing circuit includes: resistance R5, triode Q2, voltage-stabiliser tube ZD1, electrolytic capacitor CE3；
The collector of the first end of the resistance R5 and the triode Q2 are connecting the AC-DC conversion circuit just together
The base stage of output end, the second end of the resistance R5 and the triode Q2 connect the cathode of the voltage-stabiliser tube ZD1 together, described
The second end of the anode and the electrolytic capacitor CE3 of voltage-stabiliser tube ZD1 is grounded together, the emitter and the electricity of the triode Q2
The first end of solution capacitor CE3 connects the input terminal of the voltage generation circuit together；
The input terminal of the extremely described linear voltage-stabilizing circuit of the current collection of the first end of the resistance R5 and the triode Q2, institute
The first end of the emitter and the electrolytic capacitor CE3 of stating triode Q2 is the output end of the linear voltage-stabilizing circuit.
Preferably, the voltage generation circuit includes: resistance R6, benchmark voltage-stablizer U2, resistance R7, resistance R8 and capacitor
C2；
The first end of the resistance R6 connects the input terminal of the linear voltage-stabilizing circuit, the second end difference of the resistance R6
Connect the first end at the third end of the benchmark voltage-stablizer U2, the first end of the resistance R7 and the capacitor C2, the benchmark
The second end of the second end of voltage-stablizer U2 and the second end of the resistance R8, the capacitor C2 is grounded together, the benchmark pressure stabilizing
The first end of device U2 connects the second end of the resistance R7 and the first end of the resistance R8；The second end of the resistance R6 and institute
The connecting pin for stating the first end of capacitor C2 is also connected with the input terminal of the reference signal generation circuit；
The first end of the resistance R6 is the input terminal of the voltage generation circuit, the second end of the resistance R6 and described
The connecting pin of the first end of capacitor C2 is the output end of the voltage generation circuit.
Preferably, the reference signal generation circuit includes: resistance R9, adjustable potentiometer VR1 and resistance R10；
The first end of the resistance R9 connects the output end of the voltage generation circuit, the second end connection of the resistance R9
The first end of the adjustable potentiometer VR1, the second end of the adjustable potentiometer VR1 connect the first end of the resistance R10, institute
State the second end ground connection of resistance R10；The connecting pin of the second end of the resistance R9 and the first end of the adjustable potentiometer VR1 is also
Connect the input terminal of the signal processing circuit, the first end of the second end of the adjustable potentiometer VR1 and the resistance R10
Connecting pin is also connected with the reference voltage terminal of the voltage sampling circuit；
The connecting pin of the second end of the resistance R9 and the first end of the adjustable potentiometer VR1 is reference signal production
The connecting pin of the first end of first output end of raw circuit, the second end of the adjustable potentiometer VR1 and the resistance R10 is institute
State the second output terminal of reference signal generation circuit.
Preferably, the signal processing circuit include: resistance R24, resistance R25, operational amplifier U5-A, resistance R26 and
Capacitor C4；
The first end of the resistance R24 connects the current reference end of the benchmark initialization circuit, and the second of the resistance R24
End is grounded by the capacitor C4, and the resistance R24 connects the fortune by the resistance R25 with the connecting pin of the capacitor C4
The positive input terminal of amplifier U5-A is calculated, the negative input end and its output end of the operational amplifier U5-A is shorted, and the operation is put
The output end of big device U5-A connects the first end of the resistance R26, and the second end of the resistance R26 connects the invariable power and adjusts
Second input terminal of circuit；At this point, the first end of the resistance R24 is the input terminal of the signal processing circuit, the electricity
The second end for hindering R26 is the output end of the signal processing circuit；
Alternatively, the signal processing circuit includes photoelectrical coupler OT2-B, resistance R21, resistance R22, metal-oxide-semiconductor Q3, resistance
R23, resistance R24, resistance R25, capacitor C4, operational amplifier U5-A and resistance R26；
Photoelectrical coupler OT2-B is coupled to light adjusting circuit, the third end ground connection of photoelectrical coupler OT2-B, photoelectrical coupler
The 4th end of OT2-B connects the connecting node of the resistance R21 and the resistance R22 and is connected to the base stage of the metal-oxide-semiconductor Q3,
The first end of the resistance R21 connects VCC, and the second end of the resistance R22 is grounded, described in the drain electrode connection of the metal-oxide-semiconductor Q3
The second end of resistance R23, the source electrode ground connection of the metal-oxide-semiconductor Q3, the first end of the resistance R23 connect the benchmark initialization circuit
Current reference end, the first end of the resistance R24 connects the first end of the resistance R23, and the second end of the resistance R24 is logical
The capacitor C4 ground connection is crossed, the resistance R24 connects the operation by the resistance R25 with the connecting pin of the capacitor C4 and puts
The positive input terminal of big device U5-A, the negative input end and its output end of the operational amplifier U5-A are shorted, the operational amplifier
The output end of U5-A connects the first end of the resistance R26, and the second end of the resistance R26 connects the invariable power and adjusts circuit
The second input terminal；At this point, the connecting pin of the first end of the resistance R23 and the first end of the resistance R24 is the signal
The input terminal of processing circuit, the second end of the resistance R26 are the output end of the signal processing circuit.
Preferably, current sampling circuit includes: resistance R11, resistance R12, resistance R13, resistance R14, operational amplifier U4-
A and resistance R15；
The first end of the resistance R11 is grounded, and the second end of the resistance R11 passes through the resistance R14 connection fortune
The output end of amplifier U4-A is calculated, the second end of the resistance R11 is also connected with the negative input end of the operational amplifier U4-A；Institute
The first end for stating resistance R12 connects the negative output terminal of the AC-DC conversion circuit, described in the second end connection of the resistance R12
The positive input terminal of operational amplifier U4-A, the positive input terminal of the operational amplifier U4-A also pass through the resistance R13 ground connection, institute
The output end for stating operational amplifier U4-A connects the first end of the resistance R15, and the second end of the resistance R15 connects the perseverance
The first input end of power conditioning circuitry；
The first end of the resistance R12 is the input terminal of the current sampling circuit, and the second end of the resistance R15 is institute
State the output end of current sampling circuit；
The voltage sampling circuit include: resistance R16, resistance R17, resistance R18, resistance R19, capacitor C3, resistance R20 and
Operational amplifier U4-B；
The first end of the resistance R16 connects the positive output end of the AC-DC conversion circuit, and the second of the resistance R16
End connects the positive input terminal of the operational amplifier U4-B, and the positive input terminal of the operational amplifier U4-B also passes through the resistance
R17 ground connection, the first end of the resistance R18 connect the voltage reference end of the benchmark initialization circuit, and the second of the resistance R18
End connects the negative input end of the operational amplifier U4-B, the second end of the resistance R18 also pass sequentially through the capacitor C3 and
The resistance R19 connects the output end of the operational amplifier U4-B, described in the output end connection of the operational amplifier U4-B
The first end of resistance R20, the second end of the resistance R20 are also connected with the perseverance after connecting the output end of the current sampling circuit
The first input end of power conditioning circuitry；
The first end of the resistance R16 is the input terminal of the voltage sampling circuit, and the first end of the resistance R18 is institute
The voltage input end of voltage sampling circuit is stated, the second end of the resistance R20 is the output end of the voltage sampling circuit.
Preferably, it includes: capacitor C5, resistance R27, resistance R28, photoelectrical coupler OT1-A, fortune that institute's invariable power, which adjusts circuit,
Calculate amplifier U5-B；
After the capacitor C5 connects with the resistance R27, it is connected in parallel on the negative input end of the operational amplifier U5-B and defeated
Between outlet, the negative input end of the operational amplifier U5-B is also connected with the output end and voltage sample of the current sampling circuit
The positive input terminal of the output end of circuit, the operational amplifier U5-B connects the output end of the signal processing circuit, the fortune
The output end for calculating amplifier U5-B connects the second end of the photoelectrical coupler OT1-A, the photoelectricity coupling by the resistance R28
The first end of clutch OT1-A connects VCC, and the photoelectrical coupler OT1-A is coupled to the feedback end of the AC-DC conversion circuit；
The negative input end of the operational amplifier U5-B is the first input end that the invariable power adjusts circuit, the operation
The positive input terminal of amplifier U5-B is the second input terminal that the invariable power adjusts circuit.
The present invention also provides a kind of LED drive powers, including above-described Constant-power LED drive circuit.
Implement Constant-power LED drive circuit of the invention, has the advantages that adjust automatically may be implemented in the present invention
Output voltage and output electric current, realize constant power output, and output power is unrelated with the voltage of input, are greatly improved LED drive
The suitable application area of dynamic power supply.In addition, Constant-power LED drive circuit of the invention using automatically detection voltage and electric current by the way of,
Adjust automatically output voltage and output voltage, and power limitation control is carried out, to realize the purpose of constant power output, can effectively save
Less manpower cost, while the maloperation that manual operation can also be avoided to generate.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the structural schematic diagram of Constant-power LED drive circuit first embodiment of the invention；
Fig. 2 is the structural schematic diagram of Constant-power LED drive circuit second embodiment of the invention；
Fig. 3 is the circuit diagram of the Constant-power LED drive circuit of the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It is the Constant-power LED drive circuit structural schematic diagram of the embodiment of the present invention with reference to Fig. 1.As shown in Figure 1, the perseverance function
Rate LED drive circuit includes: AC-DC conversion circuit 10, benchmark initialization circuit 20, current sampling circuit 40, voltage sampling circuit
50, signal processing circuit 60 and invariable power adjust circuit 70.Wherein, the positive output end (LED+) of AC-DC conversion circuit 10 point
Not Lian Jie the input terminal of benchmark initialization circuit 20 and the input terminal of voltage sampling circuit 50, the negative output of AC-DC conversion circuit 10
Hold the input terminal of (LED-) connection current sampling circuit 40；The current reference end connection signal processing circuit of benchmark initialization circuit 20
60 input terminal, the voltage input end of the voltage reference end connection voltage sampling circuit 50 of benchmark initialization circuit 20；Current sample
The output end of circuit 40 connect with the output end of voltage sampling circuit 50 after, reconnect invariable power adjust circuit 70 first input
End；The output end connection invariable power of signal processing circuit 60 adjusts the second input terminal of circuit 70；Invariable power adjusts circuit 70 also
Connect the feedback end of AC-DC conversion circuit 10.
In the embodiment of the present invention, AC-DC conversion circuit 10 is for converting alternating current to direct current and by direct current electricity output
To load.
Benchmark initialization circuit 20 is for generating reference signal.Wherein, reference signal packet caused by benchmark initialization circuit 20
Current reference signal and voltage reference signal are included, corresponding current reference signal and voltage are generated by the benchmark initialization circuit 20
Reference signal can control the output voltage and output electric current of LED drive power.
The current signal and enhanced processing that current sampling circuit 40 is used to export acquisition AC-DC conversion circuit 10, and will
The current signal of enhanced processing exports to invariable power and adjusts circuit 70.In the embodiment of the present invention, current sampling circuit 40 can be right
Current signal collected is resent to invariable power adjusting circuit 70 after amplifying processing according to a certain percentage, by invariable power tune
Economize on electricity road 70 carries out comparing enhanced processing accordingly and feeds back to AC-DC conversion circuit 10, to the defeated of AC-DC conversion circuit 10
Electric current is adjusted out, achievees the purpose that the output electric current for automatically adjusting LED drive power.Wherein, AC-DC conversion circuit 10
Output electric current is the output electric current of LED drive power.
Voltage sampling circuit 50 is used to acquire the voltage signal of the output of AC-DC conversion circuit 10 and believes voltage collected
Number output to invariable power adjust circuit 70.The voltage sampling circuit 50 can feed back AC-DC by the way of electric resistance partial pressure and turn
The voltage value of the voltage signal of the output of circuit 10 and the situation of change of voltage signal are changed, and by the voltage value fed back or electricity
The situation of change of pressure signal is sent to invariable power and adjusts circuit 70, realizes the voltage signal exported to AC-DC conversion circuit 10
It adjusts, that is, realizes the adjusting to the output voltage of LED drive power, reach the output voltage of automatic adjustment LED drive power
Purpose.Wherein, the output voltage of AC-DC conversion circuit 10 is the output voltage of LED drive power.
Signal processing circuit 60 be used for by the reference signal that exports of received benchmark initialization circuit 20 carry out processing conversion
For direct current signal, and the direct current signal is sent to invariable power and adjusts circuit 70.
Invariable power adjusts circuit 70 and is used for according to the received current signal of institute, voltage signal, DC signal output feedback letter
Number to AC-DC conversion circuit 10, so that AC-DC conversion circuit 10 keeps constant power output.It is defeated that circuit 70 is adjusted by invariable power
Feedback signal out to AC-DC conversion circuit 10 can be such that AC-DC conversion circuit 10 is believed according to the reality output of LED drive power
Number (voltage signal and current signal) adjusts the output electric current of LED drive power, so that LED drive power reaches constant power output
Purpose.
With reference to Fig. 2, Fig. 2 is the structural schematic diagram of Constant-power LED drive circuit second embodiment provided by the invention.
The embodiment further comprises on the basis of first embodiment: light adjusting circuit 30.
The light adjusting circuit 30 is connect with signal processing circuit 60, for receiving and handling dim signal and by treated
Dim signal is sent to signal processing circuit 60.The light adjusting circuit 30 can by different dim signal (such as resistance dim signal,
Any one or more in voltage dim signal, PWM dim signal) it is processed into the PWM dim signal of linear change.Wherein,
Dim signal is provided by external circuit.
The pwm signal for the linear change that light adjusting circuit 30 exports mainly is converted into centainly comparing by the signal processing circuit 60
The direct current signal of example, and be sent to invariable power and adjust circuit 70.
By increasing light adjusting circuit on the basis of first embodiment, Constant-power LED drive circuit of the invention can be made
The output electric current of LED drive power is adjusted according to different dim signals, so that LED drive power is made in different dim signals
Constant power output still may be implemented under.
Specifically, being that the circuit of one preferred embodiment of Constant-power LED drive circuit of the embodiment of the present invention is former with reference to Fig. 3
Reason figure, wherein the circuit diagram is light modulation constant power output, i.e. the invariable power can be adjusted according to different dim signals
The output electric current of LED drive power makes LED drive power that invariable power still may be implemented under different dim signal effects defeated
Out.
As shown in figure 3, AC-DC conversion circuit 10 includes fuse F1, common mode inductance LF1, rectification in the embodiment of the present invention
Bridge BD1, electrolytic capacitor CE1, diode D2, electrolytic capacitor CE2, switch metal-oxide-semiconductor Q1, resistance R4, photoelectrical coupler OT1-B and
Control IC U1.
Its specific working principle are as follows: alternating current AC passes through fuse F1 and common mode inductance LF1 to rectifier bridge BD1, rectification
Voltage afterwards filters DC voltage by electrolytic capacitor CE1, and filtered DC voltage is coupled by a certain percentage by transformer
To primary side, secondary is rectified by diode D2, and electrolytic capacitor CE2 filters DC output voltage and electric current, switchs metal-oxide-semiconductor Q1 root
According to the size of switching pwm signal control output voltage and output electric current, control IC is specially controlled by photoelectrical coupler OT1-B
The feedback end (FB) of U1, by control IC U1 according to the feedback signal output pwm signal of feedback end to resistance R3 control switch MOS
The duty ratio of pipe Q1 reaches constant power output to realize the purpose stabilized the output voltage with electric current.
In the embodiment of the present invention, benchmark initialization circuit 20 includes: linear voltage-stabilizing circuit 201, voltage generation circuit 202, base
Calibration signal generation circuit 203.
The positive output end of the input terminal connection AC-DC conversion circuit 10 of linear voltage-stabilizing circuit 201, linear voltage-stabilizing circuit 201
Output end connection voltage generation circuit 202 input terminal, voltage generation circuit 202 output end connection reference signal generate electricity
The input terminal on road 203, the input terminal of the first output end connection signal processing circuit 60 of reference signal generation circuit 203, benchmark
The reference voltage terminal of the second output terminal connection voltage sampling circuit 50 of signal generating circuit 203；Linear voltage-stabilizing circuit 201 it is defeated
Enter the input terminal that end is benchmark initialization circuit 20, the first output end of reference signal generation circuit 203 is benchmark initialization circuit 20
Current reference end, the second output terminal of reference signal generation circuit 203 is the voltage reference end of benchmark initialization circuit 20.
Specifically, as shown in figure 3, linear voltage-stabilizing circuit 201 includes: resistance R5, triode Q2, voltage-stabiliser tube ZD1, electrolysis electricity
Hold CE3.
The first end of resistance R5 and the collector of triode Q2 connect the positive output end of AC-DC conversion circuit 10 together, electricity
The base stage of the second end and triode Q2 that hinder R5 connects the cathode of voltage-stabiliser tube ZD1, the anode and electrolytic capacitor of voltage-stabiliser tube ZD1 together
The second end of CE3 is grounded together, and the emitter of triode Q2 and the first end of electrolytic capacitor CE3 connect voltage generation circuit together
202 input terminal；The input terminal of the current collection extremely linear voltage-stabilizing circuit 201 of the first end and triode Q2 of resistance R5, triode
The emitter of Q2 and the first end of electrolytic capacitor CE3 are the output end of linear voltage-stabilizing circuit 201.
Voltage generation circuit 202 includes: resistance R6, benchmark voltage-stablizer U2, resistance R7, resistance R8 and capacitor C2.
The input terminal of the first end connection linear voltage-stabilizing circuit 201 of resistance R6, the second end of resistance R6 are separately connected benchmark
The third end of voltage-stablizer U2, the first end of resistance R7 and capacitor C2 first end, the second end and resistance R8 of benchmark voltage-stablizer U2
Second end, the second end of capacitor C2 be grounded together, the second end and resistance of the first end of benchmark voltage-stablizer U2 connection resistance R7
The first end of R8；The connecting pin of the first end of the second end and capacitor C2 of resistance R6 is also connected with reference signal generation circuit 203
Input terminal；The first end of resistance R6 is the input terminal of voltage generation circuit 202, the second end of resistance R6 and the first end of capacitor C2
Connecting pin be voltage generation circuit 202 output end.
Reference signal generation circuit 203 includes: resistance R9, adjustable potentiometer VR1 and resistance R10.
The output end of the first end connection voltage generation circuit 202 of resistance R9, the second end of resistance R9 connect adjustable potential
The first end of device VR1, the first end of the second end connection resistance R10 of adjustable potentiometer VR1, the second end ground connection of resistance R10；Electricity
The connecting pin of the first end of the second end and adjustable potentiometer VR1 of resistance R9 is also connected with the input terminal of signal processing circuit 60, adjustable
The connecting pin of the first end of the second end and resistance R10 of potentiometer VR1 is also connected with the reference voltage terminal of voltage sampling circuit 50；Electricity
The connecting pin for hindering the second end of R9 and the first end of adjustable potentiometer VR1 is the first output end of benchmark signal generating circuit 203,
The connecting pin of the first end of the second end and resistance R10 of adjustable potentiometer VR1 is the second output of benchmark signal generating circuit 203
End.
Its working principle is that: output voltage exports burning voltage VCC, the burning voltage after passing through linear voltage-stabilizing circuit 201
VCC generates stable reference voltage after passing through resistance R6, benchmark voltage-stablizer U2 (TL431), resistance R7, resistance R8 and capacitor C2,
The stable reference voltage passes through resistance R9, adjustable potentiometer VR1 and resistance R10 output current reference signal (IREF) and voltage
Reference signal (VREF).Wherein, current reference signal (IREF) and voltage reference signal (VREF) are permanent by adjustable potentiometer VR1
What equal proportion changed, when can be in a certain potentiometer value by the way that adjustable potentiometer VR1 is arranged, set identical maximum output
Voltage and maximum output current, to realize identical output power.
In addition, burning voltage VCC is also communicated to other circuits inside control IC U1 and LED drive power, for making
For the supply voltage of other circuits inside control IC U1 and LED drive power.
As shown in figure 3, signal processing circuit 60 include photoelectrical coupler OT2-B, resistance R21, resistance R22, metal-oxide-semiconductor Q3,
Resistance R23, resistance R24, resistance R25, capacitor C4, operational amplifier U5-A and resistance R26；
Photoelectrical coupler OT2-B is coupled to light adjusting circuit 30, the third end ground connection of photoelectrical coupler OT2-B, photoelectric coupling
The connecting node of the 4th end connection resistance R21 and resistance R22 of device OT2-B and the base stage for being connected to metal-oxide-semiconductor Q3, resistance R21's
First end connects VCC, the second end ground connection of resistance R22, and the drain electrode of metal-oxide-semiconductor Q3 connects the second end of resistance R23, metal-oxide-semiconductor Q3's
Source electrode ground connection, the current reference end of the first end connection benchmark initialization circuit 20 of resistance R23, the first end of resistance R24 connect electricity
The first end of R23 is hindered, the second end of resistance R24 is grounded by capacitor C4, and the connecting pin of resistance R24 and capacitor C4 pass through resistance
The positive input terminal of R25 connection operational amplifier U5-A, the negative input end of operational amplifier U5-A and its output end are shorted, and operation is put
The second end connection invariable power of the first end of the output end connection resistance R26 of big device U5-A, resistance R26 adjusts the second of circuit 70
Input terminal；The connecting pin of the first end of the first end and resistance R24 of resistance R23 is the input terminal of signal processing circuit 60, resistance
The second end of R26 is the output end of signal processing circuit 60.
Its working principle is that: burning voltage VCC passes through resistance R21, resistance R22, photoelectrical coupler OT2-B to metal-oxide-semiconductor Q3
Base stage (driving foot), the drain electrode connecting resistance R23 to current reference signal (IREF) of metal-oxide-semiconductor Q3.Wherein, resistance R23 mainly rises
To the effect of the minimum light modulation output electric current of setting.Photoelectrical coupler OT2-B receives the linearity light adjusting signal that light adjusting circuit 30 exports
(pwm signal), and by the pwm signal by making the current reference signal (IREF) in the first end of resistance R23 after metal-oxide-semiconductor Q3
PWM voltage for the PWM voltage of constant amplitude, the constant amplitude is filtered into DC voltage, direct current by resistance R24, capacitor C4
Voltage passes through the positive input terminal of resistance R25 to operational amplifier U5-A, and U5-A realizes voltage follow, and output d. c. voltage signal is simultaneously
Pass through the positive input terminal (i.e. the second input terminal of invariable power adjusting circuit 70) of resistance R26 to operational amplifier U5-B.
It will of course be understood that ground, in some other embodiment, when the Constant-power LED drive circuit is the perseverance not dimmed
When the LED drive circuit of power output, signal processing circuit 60 is only included: resistance R24, resistance R25, operational amplifier U5-A,
Resistance R26 and capacitor C4.
Wherein, the current reference end of the first end connection benchmark initialization circuit 20 of resistance R24, the second end of resistance R24 are logical
Capacitor C4 ground connection is crossed, resistance R24 connects the positive input terminal of operational amplifier U5-A with the connecting pin of capacitor C4 by resistance R25,
The negative input end of operational amplifier U5-A and its output end are shorted, and the of the output end connection resistance R26 of operational amplifier U5-A
One end, the second end connection invariable power of resistance R26 adjust the second input terminal of circuit；At this point, the first end of resistance R24 is letter
The input terminal of number processing circuit 60, the second end of resistance R26 are the output end of signal processing circuit 60；Moreover, in the embodiment
In, resistance R24 is 0 ohm.
As shown in figure 3, in the embodiment of the present invention, current sampling circuit 40 include: resistance R11, resistance R12, resistance R13,
Resistance R14, operational amplifier U4-A and resistance R15.
The first end of resistance R11 is grounded, and the second end of resistance R11 passes through the defeated of resistance R14 connection operational amplifier U4-A
Outlet, the second end of resistance R11 are also connected with the negative input end of operational amplifier U4-A；The first end connection AC-DC of resistance R12 turns
Change the negative output terminal of circuit 10, the positive input terminal of the second end connection operational amplifier U4-A of resistance R12, operational amplifier U4-A
Positive input terminal also pass through resistance R13 and be grounded, the first end of the output end connection resistance R15 of operational amplifier U4-A, resistance R15
Second end connection invariable power adjust circuit 70 first input end；The first end of resistance R12 is the defeated of current sampling circuit 40
Enter end, the second end of resistance R15 is the output end of current sampling circuit 40.
Its working principle is that: the signal of the negative output terminal of AC-DC conversion circuit 10 passes through resistance R12, resistance R13 to operation
The negative input end of the positive input terminal of amplifier U4-A, U4-A is grounded by resistance R11, the negative input end connecting resistance R14 of U4-A, thus
It realizes sampling low current signal and is enlarged into the voltage of certain ratio by operational amplifier U4-A, this passes through resistance than threshold voltage
R15 is exported to the negative input end of operational amplifier U5-B (i.e. the first input end of invariable power adjusting circuit 70).
As shown in figure 3, the voltage sampling circuit 50 includes: resistance R16, resistance R17, resistance in the embodiment of the present invention
R18, resistance R19, capacitor C3, resistance R20 and operational amplifier U4-B.
The positive output end of the first end connection AC-DC conversion circuit 10 of resistance R16, the second end of resistance R16 connect operation
The positive input terminal of amplifier U4-B, the positive input terminal of operational amplifier U4-B also pass through resistance R17 and are grounded, and the first of resistance R18
The voltage reference end of end connection benchmark initialization circuit 20, the negative input end of the second end connection operational amplifier U4-B of resistance R18,
The second end of resistance R18 also passes sequentially through the output end that capacitor C3 connects operational amplifier U4-B with resistance R19, operational amplifier
The output end of U4-B connects the first end of resistance R20, goes back after the output end of the second end connection current sampling circuit 40 of resistance R20
Connect the first input end that invariable power adjusts circuit 70；The first end of resistance R16 is the input terminal of voltage sampling circuit 50, resistance
The first end of R18 is the voltage input end of voltage sampling circuit 50, and the second end of resistance R20 is the output of voltage sampling circuit 50
End.
As shown in figure 3, it includes: capacitor C5, resistance R27, resistance that the invariable power, which adjusts circuit 70, in the embodiment of the present invention
R28, photoelectrical coupler OT1-A, operational amplifier U5-B.
After capacitor C5 connects with resistance R27, it is connected in parallel between the negative input end and output end of operational amplifier U5-B, operation
The negative input end of amplifier U5-B is also connected with the output end of current sampling circuit 40 and the output end of voltage sampling circuit 50, operation
The output end of the positive input terminal connection signal processing circuit 60 of amplifier U5-B, the output end of operational amplifier U5-B pass through resistance
The first end of the second end of R28 connection photoelectrical coupler OT1-A, photoelectrical coupler OT1-A connects VCC, photoelectrical coupler OT1-A
It is coupled to the feedback end of AC-DC conversion circuit 10；The negative input end of operational amplifier U5-B is that invariable power adjusts the of circuit 70
One input terminal, the positive input terminal of operational amplifier U5-B are the second input terminal that invariable power adjusts circuit 70.
Its working principle is that: the signal that current sampling circuit 40 exports is input to the negative input end of operational amplifier U5-B,
The signal that voltage sampling circuit 50 exports is input to the negative input end of operational amplifier U5-B；Signal processing circuit 60 exports straight
Stream voltage signal is exported by resistance R26 to the positive input terminal of operational amplifier U5-B；Operational amplifier U5-B passes through resistance R27
Loop compensation is carried out with capacitor C5, the output end of operational amplifier U5-B is connected to photoelectrical coupler OT1-A by resistance R28, by
Feedback signal is couple photoelectrical coupler OT1-B by photoelectrical coupler OT1-A, by photoelectrical coupler OT1-B that feedback signal is anti-
It is fed to the feedback end (FB) of control IC U1, by control IC U1 according to the feedback signal output pwm signal of feedback end to resistance R3
The duty ratio of control switch metal-oxide-semiconductor Q1 reaches constant power output to realize the purpose stabilized the output voltage with electric current.Here,
When it is PWM dim signal, voltage dim signal, any one in resistance dim signal that light adjusting circuit 30 is received, this hair
Bright Constant-power LED drive circuit can regulated linear proportion adjustment LED drive power output voltage and output electric current, it is real
Existing constant power output.
Constant-power LED drive circuit of the invention uses the pure analog circuit of operational amplifier and sensor, may be implemented
Automatic adjustment output voltage and output electric current realize the constant output of output power by the different places to go of operational amplifier, and
And output power is unrelated with input voltage, is greatly improved the suitable application area of LED drive power.Meanwhile the present invention is using automatic
Detect output voltage and export electric current design, and according to output voltage with export electric current actual change adjust in real time automatically it is defeated
Voltage and output electric current out, realize the purpose of constant current output, it is no longer necessary to it is artificial to adjust, it effectively saves labour turnover, and can keep away
Exempt from fault caused by manual operation.
In addition, Constant-power LED drive circuit of the invention can also widen the working range of single led power supply, keep it suitable
Broader voltage, current range are answered, to reduce the type quantity of single series, more can neatly arrange in pairs or groups lamps and lanterns, reduce
The stock amount of client.
The invention also discloses a kind of LED drive power, which includes invariable power LED driving electricity above-mentioned
Road.By the way that above-mentioned Constant-power LED drive circuit is arranged, LED drive power can be made to realize constant power output and can adjust automatically
Output voltage and output electric current.
Above embodiments only technical concepts and features to illustrate the invention, its object is to allow person skilled in the art
Scholar can understand the contents of the present invention and implement accordingly, can not limit the scope of the invention.It is all to be wanted with right of the present invention
The equivalent changes and modifications that range is done are sought, should belong to the covering scope of the claims in the present invention.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (10)
1. a kind of Constant-power LED drive circuit characterized by comprising AC-DC conversion circuit, benchmark initialization circuit, electric current are adopted
Sample circuit, voltage sampling circuit, signal processing circuit and invariable power adjust circuit；
The positive output end of the AC-DC conversion circuit is separately connected the input terminal and the voltage sample of the benchmark initialization circuit
The negative output terminal of the input terminal of circuit, the AC-DC conversion circuit connects the input terminal of the current sampling circuit；The benchmark
The current reference end of initialization circuit connects the input terminal of the signal processing circuit, the voltage reference end of the benchmark initialization circuit
Connect the voltage input end of the voltage sampling circuit；The output end of the current sampling circuit and the voltage sampling circuit
After output end connection, reconnect the first input end that the invariable power adjusts circuit；The output end of the signal processing circuit connects
Connect the second input terminal that the invariable power adjusts circuit；The invariable power adjusts circuit and is also connected with the AC-DC conversion circuit
Feedback end；
The AC-DC conversion circuit is for converting alternating current to direct current and extremely loading the direct current electricity output, the base
Quasi- initialization circuit is used for for generating reference signal, the current sampling circuit to acquisition AC-DC conversion circuit output
Current signal and enhanced processing, and the current signal of enhanced processing is exported to the invariable power and adjusts circuit；The voltage is adopted
Sample circuit is used to acquire the voltage signal of the AC-DC conversion circuit output and exports voltage signal collected to the perseverance
Power conditioning circuitry, the signal processing circuit are used to receive the reference signal of the benchmark initialization circuit output and export direct current
Signal to the invariable power adjusts circuit；The invariable power adjust circuit be used for according to the received current signal of institute, voltage signal,
DC signal output feedback signal is to the AC-DC conversion circuit, so that the AC-DC conversion circuit keeps constant power output.
2. Constant-power LED drive circuit according to claim 1, which is characterized in that further include:
The light adjusting circuit being connect with the signal processing circuit；
The light adjusting circuit is used to receive and handle dim signal and dim signal is sent to the signal processing by treated
Circuit.
3. Constant-power LED drive circuit according to claim 1, which is characterized in that the benchmark initialization circuit includes: line
Property voltage regulator circuit, voltage generation circuit, reference signal generation circuit；
The input terminal of the linear voltage-stabilizing circuit connects the positive output end of the AC-DC conversion circuit, the linear voltage-stabilizing circuit
Output end connect the input terminal of the voltage generation circuit, the output end of the voltage generation circuit connects the reference signal
First output end of the input terminal of generation circuit, the reference signal generation circuit connects the input of the signal processing circuit
End, the second output terminal of the reference signal generation circuit connect the reference voltage terminal of the voltage sampling circuit；
The input terminal of the linear voltage-stabilizing circuit is the input terminal of the benchmark initialization circuit, the reference signal generation circuit
First output end is the current reference end of the benchmark initialization circuit, and the second output terminal of the reference signal generation circuit is institute
State the voltage reference end of benchmark initialization circuit.
4. Constant-power LED drive circuit according to claim 3, which is characterized in that the linear voltage-stabilizing circuit includes: electricity
Hinder R5, triode Q2, voltage-stabiliser tube ZD1, electrolytic capacitor CE3；
The collector of the first end of the resistance R5 and the triode Q2 connect the positive output of the AC-DC conversion circuit together
The base stage of end, the second end of the resistance R5 and the triode Q2 connect the cathode of the voltage-stabiliser tube ZD1, the pressure stabilizing together
The second end of the anode and the electrolytic capacitor CE3 of pipe ZD1 is grounded together, the emitter of the triode Q2 and electrolysis electricity
The first end for holding CE3 connects the input terminal of the voltage generation circuit together；
The input terminal of the extremely described linear voltage-stabilizing circuit of the current collection of the first end of the resistance R5 and the triode Q2, described three
The first end of the emitter of pole pipe Q2 and the electrolytic capacitor CE3 are the output end of the linear voltage-stabilizing circuit.
5. Constant-power LED drive circuit according to claim 3, which is characterized in that the voltage generation circuit includes: electricity
Hinder R6, benchmark voltage-stablizer U2, resistance R7, resistance R8 and capacitor C2；
The first end of the resistance R6 connects the input terminal of the linear voltage-stabilizing circuit, and the second end of the resistance R6 is separately connected
The third end of the benchmark voltage-stablizer U2, the first end of the resistance R7 and the capacitor C2 first end, the benchmark pressure stabilizing
The second end of the second end of device U2 and the second end of the resistance R8, the capacitor C2 is grounded together, the benchmark voltage-stablizer U2
First end connect the second end of the resistance R7 and the first end of the resistance R8；The second end of the resistance R6 and the electricity
The connecting pin for holding the first end of C2 is also connected with the input terminal of the reference signal generation circuit；
The first end of the resistance R6 is the input terminal of the voltage generation circuit, the second end of the resistance R6 and the capacitor
The connecting pin of the first end of C2 is the output end of the voltage generation circuit.
6. Constant-power LED drive circuit according to claim 3, which is characterized in that the reference signal generation circuit packet
It includes: resistance R9, adjustable potentiometer VR1 and resistance R10；
The first end of the resistance R9 connects the output end of the voltage generation circuit, described in the second end connection of the resistance R9
The first end of adjustable potentiometer VR1, the second end of the adjustable potentiometer VR1 connect the first end of the resistance R10, the electricity
Hinder the second end ground connection of R10；The connecting pin of the second end of the resistance R9 and the first end of the adjustable potentiometer VR1 is also connected with
The connection of the first end of the input terminal of the signal processing circuit, the second end of the adjustable potentiometer VR1 and the resistance R10
End is also connected with the reference voltage terminal of the voltage sampling circuit；
The connecting pin of the second end of the resistance R9 and the first end of the adjustable potentiometer VR1 is that the reference signal generates electricity
The connecting pin of the first end of first output end on road, the second end of the adjustable potentiometer VR1 and the resistance R10 is the base
The second output terminal of calibration signal generation circuit.
7. Constant-power LED drive circuit according to claim 2, which is characterized in that the signal processing circuit includes: electricity
Hinder R24, resistance R25, operational amplifier U5-A, resistance R26 and capacitor C4；
The first end of the resistance R24 connects the current reference end of the benchmark initialization circuit, and the second end of the resistance R24 is logical
The capacitor C4 ground connection is crossed, the resistance R24 connects the operation by the resistance R25 with the connecting pin of the capacitor C4 and puts
The positive input terminal of big device U5-A, the negative input end and its output end of the operational amplifier U5-A are shorted, the operational amplifier
The output end of U5-A connects the first end of the resistance R26, and the second end of the resistance R26 connects the invariable power and adjusts circuit
The second input terminal；At this point, the first end of the resistance R24 is the input terminal of the signal processing circuit, the resistance R26
Second end be the signal processing circuit output end；
Alternatively, the signal processing circuit includes: photoelectrical coupler OT2-B, resistance R21, resistance R22, metal-oxide-semiconductor Q3, resistance
R23, resistance R24, resistance R25, resistance R24, resistance R25, operational amplifier U5-A, resistance R26 and capacitor C4；
Photoelectrical coupler OT2-B is coupled to light adjusting circuit, the third end ground connection of photoelectrical coupler OT2-B, photoelectrical coupler OT2-B
The 4th end connect the connecting node of the resistance R21 and the resistance R22 and be connected to the base stage of the metal-oxide-semiconductor Q3, it is described
The first end of resistance R21 connects VCC, the second end ground connection of the resistance R22, and the drain electrode of the metal-oxide-semiconductor Q3 connects the resistance
The second end of R23, the source electrode ground connection of the metal-oxide-semiconductor Q3, the first end of the resistance R23 connect the electricity of the benchmark initialization circuit
Reference edge is flowed, the first end of the resistance R24 connects the first end of the resistance R23, and the second end of the resistance R24 passes through institute
Capacitor C4 ground connection is stated, the resistance R24 connects the operational amplifier by the resistance R25 with the connecting pin of the capacitor C4
The positive input terminal of U5-A, the negative input end and its output end of the operational amplifier U5-A are shorted, the operational amplifier U5-A
Output end connect the first end of the resistance R26, the second end of the resistance R26 connects that the invariable power adjusts circuit
Two input terminals；At this point, the connecting pin of the first end of the resistance R23 and the first end of the resistance R24 is the signal processing
The input terminal of circuit, the second end of the resistance R26 are the output end of the signal processing circuit.
8. Constant-power LED drive circuit according to claim 1, which is characterized in that current sampling circuit includes: resistance
R11, resistance R12, resistance R13, resistance R14, operational amplifier U4-A and resistance R15；
The first end of the resistance R11 is grounded, and the second end of the resistance R11 is put by the resistance R14 connection operation
The output end of big device U4-A, the second end of the resistance R11 are also connected with the negative input end of the operational amplifier U4-A；The electricity
The first end of resistance R12 connects the negative output terminal of the AC-DC conversion circuit, and the second end of the resistance R12 connects the operation
The positive input terminal of amplifier U4-A, the positive input terminal of the operational amplifier U4-A also pass through the resistance R13 ground connection, the fortune
The output end for calculating amplifier U4-A connects the first end of the resistance R15, and the second end of the resistance R15 connects the invariable power
Adjust the first input end of circuit；
The first end of the resistance R12 is the input terminal of the current sampling circuit, and the second end of the resistance R15 is the electricity
Flow the output end of sample circuit；
The voltage sampling circuit includes: resistance R16, resistance R17, resistance R18, resistance R19, capacitor C3, resistance R20 and operation
Amplifier U4-B；
The first end of the resistance R16 connects the positive output end of the AC-DC conversion circuit, and the second end of the resistance R16 connects
The positive input terminal of the operational amplifier U4-B is connect, the positive input terminal of the operational amplifier U4-B also passes through the resistance R17
Ground connection, the first end of the resistance R18 connect the voltage reference end of the benchmark initialization circuit, the second end of the resistance R18
The negative input end of the operational amplifier U4-B is connected, the second end of the resistance R18 also passes sequentially through the capacitor C3 and institute
The output end that resistance R19 connects the operational amplifier U4-B is stated, the output end of the operational amplifier U4-B connects the electricity
The first end of R20 is hindered, the second end of the resistance R20 is also connected with the permanent function after connecting the output end of the current sampling circuit
The first input end of rate adjusting circuit；
The first end of the resistance R16 is the input terminal of the voltage sampling circuit, and the first end of the resistance R18 is the electricity
The voltage input end of sample circuit is pressed, the second end of the resistance R20 is the output end of the voltage sampling circuit.
9. Constant-power LED drive circuit according to claim 1, which is characterized in that it includes: electricity that institute's invariable power, which adjusts circuit,
Hold C5, resistance R27, resistance R28, photoelectrical coupler OT1-A, operational amplifier U5-B；
After the capacitor C5 connects with the resistance R27, it is connected in parallel on the negative input end and output end of the operational amplifier U5-B
Between, the negative input end of the operational amplifier U5-B is also connected with the output end and voltage sampling circuit of the current sampling circuit
Output end, the positive input terminal of the operational amplifier U5-B connects the output end of the signal processing circuit, and the operation is put
The output end of big device U5-B connects the second end of the photoelectrical coupler OT1-A, the photoelectrical coupler by the resistance R28
The first end of OT1-A connects VCC, and the photoelectrical coupler OT1-A is coupled to the feedback end of the AC-DC conversion circuit；
The negative input end of the operational amplifier U5-B is the first input end that the invariable power adjusts circuit, the operation amplifier
The positive input terminal of device U5-B is the second input terminal that the invariable power adjusts circuit.
10. a kind of LED drive power, which is characterized in that including the described in any item invariable power LED driving electricity of claim 1-9
Road.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811070446.6A CN109168216B (en) | 2018-09-13 | 2018-09-13 | Constant-power LED driving circuit and LED driving power supply |
| PCT/CN2019/080579 WO2020052223A1 (en) | 2018-09-13 | 2019-03-29 | Constant power led driving circuit and led driving power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811070446.6A CN109168216B (en) | 2018-09-13 | 2018-09-13 | Constant-power LED driving circuit and LED driving power supply |
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| CN109168216B CN109168216B (en) | 2023-10-27 |
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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 |
| CN118075944A (en) * | 2024-04-19 | 2024-05-24 | 深圳市德辰光电科技有限公司 | Lamp wick integrated LED lamp bead control system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020052223A1 (en) | 2020-03-19 |
| CN109168216B (en) | 2023-10-27 |
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