CN103997827A - High-efficiency electrolytic-capacitor-free LED driving power source based on Boost circuit - Google Patents

High-efficiency electrolytic-capacitor-free LED driving power source based on Boost circuit Download PDF

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CN103997827A
CN103997827A CN201410196651.2A CN201410196651A CN103997827A CN 103997827 A CN103997827 A CN 103997827A CN 201410196651 A CN201410196651 A CN 201410196651A CN 103997827 A CN103997827 A CN 103997827A
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diode
capacitor
circuit
driving power
switching tube
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CN103997827B (en
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汪飞
钟元旭
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University of Shanghai for Science and Technology
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Abstract

The invention discloses a high-efficiency electrolytic-capacitor-free LED driving power source based on a Boost circuit. The high-efficiency electrolytic-capacitor-free LED driving power source based on the Boost circuit comprises an alternating input power source, a bridge type rectifier circuit, an inductor, an auxiliary circuit, a main switching tube, a reverse blocking diode, an output filtering capacitor and an LED load. The high-efficiency electrolytic-capacitor-free LED driving power source based on the Boost circuit has the advantages that the auxiliary circuit can balance the low-frequency pulse power of input power pin and the low-frequency pulse power of output power po, and can drive the LED load in a constant current mode; the voltage of an energy-storing capacitor is designed to be in the mode that direct current voltage is overlapped with large pulse ripple voltage, and therefore a non-electrolytic capacitor with a small capacitance value (like a thin-film capacitor) can serve as the energy-storing capacitor; a three-port DC/DC converter is formed by the auxiliary circuit and the Boost main circuit, most of input power can reach the LED load through one time of energy conversion, and therefore the efficiency is high; the inductor needed by the auxiliary circuit and the inductor of the Boost main circuit are shared, and the circuit is simple in structure and low in cost.

Description

A kind of high efficiency no electrolytic capacitor LED driving power based on Boost circuit
Technical field
The present invention relates to electric and electronic technical field, particularly relate to a kind of high efficiency no electrolytic capacitor LED driving power based on Boost circuit, belong to ac/dc (AC/DC), DC-DC (DC/DC) converter field.
Background technology
Along with light-emitting diode (light-emitting diode, LED) the continuous progress of key technology, the aspects such as its light efficiency, life-span, dimming behavior have more advantage than traditional lighting light source (as incandescent lamp, fluorescent lamp), and LED lighting source is expected to become high efficiency light source of new generation.LED illumination has at present been applied to the fields such as street lighting, general lighting, LCD screen backlight, landscape light in city, medical treatment and traffic.
But the popularization of LED illumination still has many bottleneck problems to need to solve with development.The life-span that wherein use of electrochemical capacitor in LED driving power limited driving power is the key factor that affects LED illuminator life-span, volume.Therefore, exploitation volume driving power little, that the life-span is long, efficiency is high, cost is low is conducive to promote the development of LED illumination.
Be illustrated in figure 1 traditional tandem type LED driving power structured flowchart, formed by pfc converter cascade DC/DC converter.The pfc converter major function of prime is to realize power factor correction (power factor correction, PFC), and the DC/DC converter of rear class is mainly to provide constant drive current for LED load.In Alternating Current Power Supply occasion, in order to reach higher input power factor, meet the harmonic requirement of standard IEC 61000-3-2, AC/DC LED driving power all needs to carry out input power factor correction.But in the time of PF=1, input current and input voltage are the sine wave with frequency homophase, its input power presents the low frequency power pulsation form of twice input voltage frequency, therefore conventionally can select the electrochemical capacitor that capacity is larger to carry out this low frequency pulsating power of balance.But high-quality electrochemical capacitor is under rated temperature 105o C, useful life, far below the long-life of LED luminescence chip 80 ~ 100 kh, the use of electrochemical capacitor limited LED lighting source bulk life time generally in 10 kh left and right.Moreover, suppose that in traditional tandem type LED driving power, the efficiency of pfc converter and DC/DC converter is respectively with , the overall efficiency of driving power is the product of 2 stage converter efficiency: (in formula < 1, < 1), so input power need to could arrive LED load through twice energy conversion in the two-stage topologies of cascade, overall efficiency is low, and the topology of two-stage type makes, and whole driving power device is many, volume is large, integrated level is low; Although can reduce to a certain extent electrochemical capacitor capacitance by increasing the ripple voltage of dc-link capacitance, DC bus ripple voltage infinitely increases can be affected pfc converter and normally work.
Summary of the invention
The shortcoming such as AC/DC LED driving power overall efficiency that the object of the invention is to overcome Cascade Topology Structure structure is low, device is many, volume is large, integrated level is low, overcome because using electrochemical capacitor to reduce the deficiency of LED lighting source bulk life time, a kind of high efficiency no electrolytic capacitor LED driving power based on Boost circuit is provided.Have that efficiency is high, volume is little, no electrolytic capacitor, reliability is high, driveability is good feature.
For achieving the above object, the present invention adopts following technical proposals:
A high efficiency no electrolytic capacitor LED driving power based on Boost circuit, comprising: bridge rectifier, inductance, auxiliary circuit, main switch, reverse blocking diode pipe, output filter capacitor and LED load.It is characterized in that: described bridge rectifier connects inductance, auxiliary circuit, main switch, reverse blocking diode pipe, output filter capacitor and LED load successively.
Described bridge rectifier is by the first diode d r1 , the second diode d r2 , the 3rd diode d r3 with the 4th diode d r4 composition; Described the first diode d r1 anodic bonding described in the 3rd diode d r3 negative electrode, described the second diode d r2 anodic bonding described in the 4th diode d r4 negative electrode, described the first diode d r1 with described the second diode d r2 negative electrode docking, described the 3rd diode d r3 with described the 4th diode d r4 anode docking; Described auxiliary circuit is by second switch pipe s 2 , the 6th diode d a2 , the 3rd switching tube s 3 , storage capacitor c a composition; The 3rd switching tube s 3 source electrode connects inductance lwith the second diode d r2 the common node of negative electrode, the 3rd switching tube s 3 drain electrode connects storage capacitor c a positive pole and the 6th diode d a2 the common node of negative electrode, the 6th diode d a2 anode and second switch pipe s 2 source electrode be connected, second switch pipe s 2 drain electrode connect reverse blocking diode pipe d a1 anode, the first switching tube s 1 drain electrode and inductance lcommon node; Described i.e. the 5th diode of reverse blocking diode pipe 5 d a1 , the 5th diode d a1 negative electrode and output filter capacitor c o positive pole anodal, LED load is connected, output filter capacitor c o the negative pole of negative pole, LED load, storage capacitor c a negative pole, the first switching tube s 1 source electrode all with the 4th diode d r4 anode be connected.
Described by the first diode d r1 , the second diode d r2 , the 3rd diode d r3 with the 4th diode d r4 the bridge rectifier of composition is realized ac/dc conversion.
Described the first switching tube s 1 and inductance lacting in conjunction realizes input power factor correction and regulates storage capacitor c a voltage.
Described storage capacitor c a voltage is designed to the working forms of the large pulsation of direct voltage stack ripple voltage, and its capacitance is less.
Described auxiliary circuit can the instantaneous input power of balance and the low frequency pulsating power of power output, input power be less than power output ( p in <p o ) under condition and input power be greater than power output ( p in >p o ) realize constant output under condition and regulate, for LED load provides constant drive current.
Described filter capacitor c o can filtering output voltage ripple.
Compared with prior art, technical characteristics of the present invention and advantage are: inductance lbe operated in discontinuous current pattern, realize input power factor correction; Storage capacitor c a voltage be designed to the form of the large pulsation of direct voltage stack ripple voltage, thereby can use non-electrolytic capacitor to substitute electrochemical capacitor; Auxiliary circuit, can the instantaneous input power of balance under different input power condition p in and power output p o imbalance, and constant-current driving LED load; The needed inductance of auxiliary circuit and Boost main circuit inductance are realized and being shared, and make that circuit structure is simple and cost is low.
Brief description of the drawings
Fig. 1 is traditional tandem type LED driving power structured flowchart.
Fig. 2 is the theory diagram of a kind of high efficiency no electrolytic capacitor LED driving power based on Boost circuit of the present invention.
Fig. 3 is the main circuit of a kind of high efficiency no electrolytic capacitor LED driving power based on Boost circuit of the present invention.
Fig. 4 is the groundwork waveform of a kind of high efficiency no electrolytic capacitor LED driving power based on Boost circuit of the present invention.
Fig. 5 is that a kind of high efficiency no electrolytic capacitor LED driving power main circuit based on Boost circuit of the present invention exists p in < p o switching tube logic sequence under condition and groundwork waveform.
Fig. 6 is that a kind of high efficiency no electrolytic capacitor LED driving power main circuit based on Boost circuit of the present invention exists p in > p o switching tube logic sequence under condition and groundwork waveform.
Fig. 7 is that a kind of high efficiency no electrolytic capacitor LED driving power main circuit based on Boost circuit of the present invention exists p in < p o the equivalent circuit diagram of each switch mode under condition.
Fig. 8 is that a kind of high efficiency no electrolytic capacitor LED driving power main circuit based on Boost circuit of the present invention exists p in > p o the equivalent circuit diagram of each switch mode under condition.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention.
Embodiment mono-: Fig. 2 is a kind of high efficiency no electrolytic capacitor LED driving power theory diagram based on Boost circuit of the present embodiment.Main circuit is three port DC/DC converters, adds storage capacitor in main circuit, and this storage capacitor can the instantaneous input power of balance under different input power condition p in and power output p o imbalance, realize constant output regulate, for LED load provides constant drive current.
Embodiment bis-: be illustrated in figure 3 a kind of high efficiency no electrolytic capacitor LED driving power main circuit diagram based on Boost circuit of the present embodiment, the present embodiment and embodiment mono-are basic identical, and its special feature is as follows:
A kind of high efficiency no electrolytic capacitor LED driving power main circuit based on Boost circuit comprises: bridge rectifier (1), inductance (2), auxiliary circuit (3), main switch (4), reverse blocking diode pipe (5), output filter capacitor (6) and LED load (7).It is characterized in that: described bridge rectifier (1) connects inductance (2), auxiliary circuit (3), main switch (4), reverse blocking diode pipe (5), output filter capacitor (6) and LED load (7) successively.Described bridge rectifier (1) by the first diode ( d r1 ), the second diode ( d r2 ), the 3rd diode ( d r3 ) and the 4th diode ( d r4 ) composition; Described the first diode ( d r1 ) anodic bonding described in the 3rd diode ( d r3 ) negative electrode, described the second diode ( d r2 ) anodic bonding described in the 4th diode ( d r4 ) negative electrode, described the first diode ( d r1 ) and described the second diode ( d r2 ) negative electrode docking, described the 3rd diode ( d r3 ) and described the 4th diode ( d r4 ) anode docking; Described auxiliary circuit (3) by second switch pipe ( s 2 ), the 6th diode ( d a2 ), the 3rd switching tube ( s 3 ), storage capacitor ( c a ) composition; The 3rd switching tube ( s 3 ) source electrode connection inductance ( l) and the second diode ( d r2 ) common node of negative electrode, the 3rd switching tube ( s 3 ) drain electrode connection storage capacitor ( c a ) positive pole and the 6th diode ( d a2 ) common node of negative electrode, the 6th diode ( d a2 ) anode and second switch pipe ( s 2 ) source electrode be connected, second switch pipe ( s 2 ) drain electrode connect reverse blocking diode pipe ( d a1 ) anode, main switch the first switching tube ( s 1 ) drain electrode and inductance ( l) common node; Described reverse blocking diode pipe (5) the 5th diode ( d a1 ), the 5th diode ( d a1 ) negative electrode and output filter capacitor ( c o ) positive pole anodal, LED load (7) is connected, output filter capacitor ( c o ) negative pole, LED load (7) negative pole, storage capacitor ( c a ) negative pole, the first switching tube ( s 1 ) source electrode all with the 4th diode ( d r4 ) anode be connected.
A kind of high efficiency no electrolytic capacitor LED driving power main circuit based on Boost circuit taking Fig. 3 as the implementation case below, 4-8 narration specific works principle of the present invention by reference to the accompanying drawings, design principle:
Fig. 4 is the groundwork waveform of a kind of high efficiency no electrolytic capacitor LED driving power based on Boost circuit proposed by the invention.In order to reach higher input power factor, inductance lbe operated in discontinuous current state (discontinuous current mode, DCM), realize power factor correction.In order to mate the low frequency pulsating power of instantaneous input power and power output, on Boost main circuit, add auxiliary circuit with three-port network form, storage capacitor in auxiliary circuit c a energy can realize two-way flow, and the inductance of auxiliary circuit and Boost main circuit inductance share.At a power frequency period, work as input power p in be less than power output p o time, s 2 turn-off, by controlling always s 1 , S 3 conducting state can provide constant operating current for LED load, now, storage capacitor c a release energy to the energy difference of output loading with compensation power output and input power, so the voltage of storage capacitor v ca decline; Work as input power p in be greater than power output p o time, s 3 turn-off always, control s 1 , S 2 on off state can be implemented as LED load constant operating current be provided, now, remaining energy storage is at electric capacity c a upper, so the voltage of storage capacitor v ca rise.As can be seen here, this LED driving power exists p in <p o operating state and p in >p o operating state be distinct.Fig. 5 is that main circuit exists p in < p o switching tube logic sequence under condition and groundwork waveform; Fig. 6 main circuit exists p in >p o switching tube logic sequence under condition and groundwork waveform
1. the principle Analysis under different capacity condition
1.1 work as p in <p o time operational modal analysis
Fig. 5 is main circuit p in <p o switching tube logic sequence under condition and groundwork waveform, now have five different operation modes, and the equivalent circuit diagram of its switch mode as shown in Figure 7.
1) operation mode 1, [ t o , t 1 ]: its equivalent operating circuit is as shown in Fig. 7 (a). t o before moment, inductive current i l be zero, filter capacitor c o to LED load supplying. p in <p o switching tube under power condition s 2 turn-off always, t o moment, switching tube s 1 conducting, rectifier diode d r1 with d r4 (or d r2 with d r3 ) conducting, input voltage is added to inductance after rectification lupper, inductive current i l the linearity of starting from scratch rises.Suppose that input voltage remains unchanged in a switch periods, has:
（1）
2) operation mode 2, [ t 1 , t 2 ]: its equivalent operating circuit as shown in Fig. 7 (b), t 1 moment switching tube s 1 turn-off, inductive current linearity rises to s 1 maximum in a switch periods.According to formula (1), t 1 the inductive current in moment is:
（2）
In formula d 1 with t s it is switching tube s 1 duty ratio and switch periods.
t 1 moment switching tube s 1 turn-off inductive current i l by reverse blocking diode pipe d a1 flow to outlet side, power and inductance lenergy storage shift to LED load and output filter capacitor, now inductive current i l start linear decline:
（3）
In formula v o for LED load voltage.
t 2 moment inductive current i l drop to zero, t 1 with t 2 the time interval be:
（4）
3) operation mode 3, [ t 2 , t 3 ]: its equivalent operating circuit as shown in Fig. 7 (c), switching tube s 1 , s 3 conducting, due to storage capacitor c a voltage ratio input supply voltage high, so not conducting of rectifier diode; Storage capacitor c a voltage be added to inductance lupper, inductive current i l the linearity of starting from scratch rises.Suppose storage capacitor c a voltage remains unchanged in a switch periods, has:
（5）
4) operation mode 4, [ t 3 , t 4 ]: its equivalent operating circuit as shown in Fig. 7 (d), t 3 moment switching tube s 1 , s 3 turn-off, inductive current linearity rises to s 3 maximum in a switch periods.According to formula (6), t 3 the inductive current in moment is:
（6）
In formula d 3 it is switching tube s 3 duty ratio.
So, t 3 moment switching tube s 1 , s 3 turn-off inductive current i l by reverse blocking diode pipe d a1 flow to outlet side, power and inductance lenergy storage shift to LED load and output filter capacitor, now inductive current i l start linear decline:
（7）
t 4 moment, inductance l a electric current i la drop to zero, t 1 with t 2 the time interval be:
（8）
5) operation mode 5, [ t 4 , t 5 ]: its equivalent operating circuit as shown in Fig. 7 (e), in this switch mode, inductive current i l be zero, inductance lbe operated in discontinuous current state, filter capacitor c o to LED load supplying.Because one-period internal inductance discontinuous current, so p in <p o under power condition, have:
（9）
p in <p o under power condition, in order to ensure that power output is constant, needs storage capacitor c a provide energy to LED load, control the storage capacitor big or small switching tube that releases energy so should regulate s 3 duty ratio, constant to ensure constant output current and power output.
1.2 work as p in >p o time operational modal analysis
Fig. 6 is that main circuit exists p in > p o switching tube logic sequence under condition and groundwork waveform, now have four different operation modes, and the equivalent electric circuit of its switch mode as shown in Figure 8.
1) operation mode 1, [ t 0 , t 1 ]: its equivalent operating circuit is as shown in Fig. 8 (a), and similar with Fig. 7 (a), transient analysis is also similar. t o before moment, inductive current i l be zero, filter capacitor c o to LED load supplying. p in <p o switching tube under power condition s 2 turn-off always, t o moment, switching tube s 1 conducting, rectifier diode d r1 with d r4 (or d r2 with d r3 ) conducting, input voltage is added to inductance after rectification lupper, inductive current i l the linearity of starting from scratch rises.Suppose that input voltage remains unchanged in a switch periods, has:
（10）
2) operation mode 2, [ t 1 , t 2 ]: its equivalent operating circuit as shown in Fig. 8 (b), t 1 moment switching tube s 1 turn-off, inductive current linearity rises to s 1 maximum in a switch periods.According to formula (10), t 1 the inductive current in moment is:
（11）
So, t 1 moment switching tube s 1 turn-off inductive current i l by reverse blocking diode pipe d a1 flow to outlet side, power and inductance lenergy storage shift to LED load and output filter capacitor, now inductive current i l start linear decline:
（12）
In order to ensure to provide constant operating current to LED load, the energy that load discharges in each switch periods must be constant, so t 2 moment switching tube s 2 conducting, power and inductance lenergy storage stop shifting to LED load and output filter capacitor.According to formula (12), t 2 moment inductive current is:
（13）
In formula Δ T 3 =t 2 -t 1 .
3) operation mode 3, [ t 2 , t 3 ]: its equivalent operating circuit is as shown in Fig. 8 (c). t 2 moment switching tube s 2 conducting, power and inductance lresidue energy storage storage capacitor c a shift storage capacitor c a charged, capacitance voltage rises, and inductive current i l linear decline.Suppose that input voltage and storage capacitor voltage remain unchanged in a switch periods, have
（14）
t 3 moment, switching tube s 2 turn-off inductive current i l drop to zero.
4) operation mode 4, [ t 3 , t 4 ]: its equivalent operating circuit is as shown in Fig. 8 (d). t 3 moment, switching tube s 2 turn-off inductive current i l drop to zero, inductance lbe operated in discontinuous current state, filter capacitor c o to LED load supplying.Because one-period internal inductance discontinuous current, so p in <p o under power condition, have:
（15）
p in <p o under power condition, thereby in order to make constant output current ensure that power output is constant, need storage capacitor c a provide energy to LED load, so should control s 1 , S 2 duty ratio, constant to ensure constant output current and power output.
The present invention is not limited to above-mentioned embodiment, and those skilled in the art can carry out numerous embodiments according to content disclosed by the invention.Should understand above-described embodiment and only be not used in and limit the scope of the invention for the present invention is described, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the amendment of the various equivalent form of values of the present invention.

Claims (5)

1. the high efficiency no electrolytic capacitor LED driving power based on Boost circuit, comprise: bridge rectifier (1), inductance (2), auxiliary circuit (3), main switch (4), reverse blocking diode pipe (5), output filter capacitor (6) and LED load (7), is characterized in that: described bridge rectifier (1) connects inductance (2), auxiliary circuit (3), main switch (4), reverse blocking diode pipe (5), output filter capacitor (6) and LED load (7) successively.
2. a kind of high efficiency no electrolytic capacitor LED driving power based on Boost circuit according to claim 1, is characterized in that: described bridge rectifier (1) by the first diode ( d r1 ), the second diode ( d r2 ), the 3rd diode ( d r3 ) and the 4th diode ( d r4 ) composition; Described the first diode ( d r1 ) anodic bonding described in the 3rd diode ( d r3 ) negative electrode, described the second diode ( d r2 ) anodic bonding described in the 4th diode ( d r4 ) negative electrode, described the first diode ( d r1 ) and described the second diode ( d r2 ) negative electrode docking, described the 3rd diode ( d r3 ) and described the 4th diode ( d r4 ) anode docking; Described auxiliary circuit (3) by second switch pipe ( s 2 ), the 6th diode ( d a2 ), the 3rd switching tube ( s 3 ), storage capacitor ( c a ) composition; The 3rd switching tube ( s 3 ) source electrode connection inductance ( l) and the second diode ( d r2 ) common node of negative electrode, the 3rd switching tube ( s 3 ) drain electrode connection storage capacitor ( c a ) positive pole and the 6th diode ( d a2 ) common node of negative electrode, the 6th diode ( d a2 ) anode and second switch pipe ( s 2 ) source electrode be connected, second switch pipe ( s 2 ) drain electrode connect reverse blocking diode pipe ( d a1 ) anode, main switch ( 4) the first switching tube ( s 1 ) drain electrode and inductance ( l) common node; Described reverse blocking diode pipe (5) the 5th diode ( d a1 ), the 5th diode ( d a1 ) negative electrode and output filter capacitor ( c o ) positive pole anodal, LED load (7) is connected, output filter capacitor ( c o ) negative pole, LED load (7) negative pole, storage capacitor ( c a ) negative pole, the first switching tube ( s 1 ) source electrode all with the 4th diode ( d r4 ) anode be connected.
3. a kind of high efficiency no electrolytic capacitor LED driving power based on Boost circuit according to claim 1, is characterized in that: described inductance ( l) be operated in discontinuous current pattern, realize input power factor correction.
4. a kind of high efficiency no electrolytic capacitor LED driving power based on Boost circuit according to claim 1, is characterized in that: described storage capacitor ( c a ) voltage be designed to the large pulsation of direct voltage stack ripple voltage working forms to eliminate the dependence of AC/DC LED constant-current driving power supply to electrochemical capacitor.
5. a kind of high efficiency no electrolytic capacitor LED driving power based on Boost circuit according to claim 1, is characterized in that: auxiliary circuit (3) can balance input power p in and power output p o low frequency power pulsation, and constant-current driving LED load (7).
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CN109699106A (en) * 2019-02-11 2019-04-30 华南理工大学 A kind of single-stage no bridge type High Power Factor LED driver without electrolytic capacitors
CN110855144A (en) * 2019-11-19 2020-02-28 西南交通大学 Non-isolated three-port direct current converter and control method and circuit thereof
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Publication number Priority date Publication date Assignee Title
CN104218813A (en) * 2014-09-26 2014-12-17 浙江大学 Cascaded resonance DC-DC conversion circuit combined with inductor and capacitor
CN104411041A (en) * 2014-11-19 2015-03-11 上海大学 Long-lifetime LED driving power supply of single-inductor three-port converter
CN106332355A (en) * 2016-09-06 2017-01-11 上海大学 Non-isolated non-electrolytic capacitor LED driving power supply based on Boost and Flyback circuit integration
CN106332355B (en) * 2016-09-06 2018-06-01 上海大学 A kind of non-isolated no electrolytic capacitor LED drive power integrated based on Boost and Flyback circuits
CN109005624A (en) * 2018-08-17 2018-12-14 江苏大学 A kind of no bridge type no electrolytic capacitor LED drive power and switching method
CN109699106A (en) * 2019-02-11 2019-04-30 华南理工大学 A kind of single-stage no bridge type High Power Factor LED driver without electrolytic capacitors
CN110855144A (en) * 2019-11-19 2020-02-28 西南交通大学 Non-isolated three-port direct current converter and control method and circuit thereof
CN110855144B (en) * 2019-11-19 2021-03-23 西南交通大学 Non-isolated three-port direct current converter and control method and circuit thereof
US11063512B1 (en) 2020-01-14 2021-07-13 Chicony Power Technology Co., Ltd. Power conversion system
CN113099576A (en) * 2021-04-21 2021-07-09 福州大学 Single-stage two-switch electrolytic-capacitor-free LED driving power supply and control method
CN113099576B (en) * 2021-04-21 2022-04-08 福州大学 Single-stage two-switch electrolytic-capacitor-free LED driving power supply and control method
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CN113179008B (en) * 2021-05-12 2024-02-09 阳光电源股份有限公司 Multiphase LLC resonance DC/DC circuit
CN114340084A (en) * 2021-12-31 2022-04-12 福州大学 Electrolytic capacitor-free single-stage low-ripple step-down LED driving circuit and control method
CN115395776A (en) * 2022-10-09 2022-11-25 湖南华阵电子科技有限公司 Four-state Boost converter and control method
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