CN108684104A - Based on the automotive LED headlamp driver for improving SEPIC Sofe Switch - Google Patents
Based on the automotive LED headlamp driver for improving SEPIC Sofe Switch Download PDFInfo
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- CN108684104A CN108684104A CN201810505713.1A CN201810505713A CN108684104A CN 108684104 A CN108684104 A CN 108684104A CN 201810505713 A CN201810505713 A CN 201810505713A CN 108684104 A CN108684104 A CN 108684104A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
Based on the automotive LED headlamp driver for improving SEPIC Sofe Switch, belong to field of LED drive, solving the problems, such as existing automotive LED headlamp driver, there are system effectiveness is low and the luminance shortage of driven automotive LED headlamp, unstable.Automotive LED headlamp driver：Main circuit is for driving automotive LED headlamp according to input drive signal.The echo signal output end of main circuit is connected with the target signal input of sample circuit, the sampled signal output end of sample circuit is connected with the sampled signal input of control circuit, and the driving signal output end of control circuit is connected through driving circuit with the driving signal input of main circuit.The drive signal that driving circuit is used to export control circuit enhances, and can drive main circuit.Main circuit has additional capacitance C on the basis of improving SEPIC circuitsQ, capacitance CQWith the paralleled power switches for improving SEPIC circuits.
Description
Technical field
The present invention relates to a kind of LED drivers, belong to field of LED drive.
Background technology
In recent years, LED is because with work efficiency is high, shines many advantages, such as photochromic pure, service life is long and at low cost
And it is widely used in a variety of illumination occasions.In addition to this, since reaction sensitivity intrinsic LED is high, easily controllable and body
The features such as product is small so that LED has larger potential advantages before automotive self-adaptive in the application of lighting system.Currently, LED automobile
Headlamp has showed the trend for gradually replacing existing xenon headlight.It follows that automotive LED headlamp driver
Design causes more and more concerns of related researcher.
However, existing automotive LED headlamp driver is primarily present following two problems：
One, the switching tube of existing automotive LED headlamp driver is operated in hard switching state more.Automotive LED headlamp is driven
The working frequency of dynamic device is higher, and the loss of system is bigger.This cause the system effectiveness of existing automotive LED headlamp driver compared with
It is low.
Two, existing automotive LED headlamp driver is powered by Vehicular accumulator cell.The rated output electricity of existing Vehicular accumulator cell
Relatively low, mostly 12V or 24V are pressed, and actual output voltage is unstable.This makes existing automotive LED headlamp driver exist
The luminance shortage of driven automotive LED headlamp and the unstable problem of brightness.
Invention content
The present invention by the existing automotive LED headlamp driver of solution there are system effectiveness it is low and driving LED automobile before
The luminance shortage of illuminator, unstable problem, it is proposed that a kind of based on the automotive LED headlamp driving for improving SEPIC Sofe Switch
Device.
Automotive LED headlamp driver of the present invention based on improvement SEPIC Sofe Switch includes main circuit, sampling electricity
Road, control circuit and driving circuit；
Main circuit is for driving automotive LED headlamp according to input drive signal；
The echo signal output end of main circuit is connected with the target signal input of sample circuit, the sampling letter of sample circuit
Number output end is connected with the sampled signal input of control circuit, and the driving signal output end of control circuit is through driving circuit and master
The driving signal input of circuit is connected；
The drive signal that driving circuit is used to export control circuit enhances, and can drive main circuit；
Main circuit has additional capacitance C on the basis of improving SEPIC circuitsQ, capacitance CQWith the switch for improving SEPIC circuits
Pipe is in parallel.
As preferably, main circuit includes improving SEPIC circuits and capacitance CQ, it includes direct current to improve SEPIC circuits
Potential source Vg, inductance L1, inductance L2, capacitance Cs, capacitance CM, capacitance Co, resistance Rref, diode DM, diode DoAnd switching tube；
Switching tube is band body diode DQNMOS tube, the drain D and source S of NMOS tube respectively with body diode DQThe moon
Pole is connected with anode；
Direct voltage source VgAnode with inductance L1First end be connected, inductance L1Second end simultaneously with capacitance Cs
One end, the drain D of NMOS tube, capacitance CQFirst end and diode DMAnode be connected, capacitance CsSecond end simultaneously with two poles
Pipe DoAnode and inductance L2First end be connected, diode DoCathode and capacitance CoFirst end be connected, inductance L2Second
End simultaneously with diode DMCathode and capacitance CMFirst end be connected, resistance RrefFirst end, capacitance CoSecond end, capacitance
CMSecond end, capacitance CQSecond end, the source S of NMOS tube and direct voltage source VgCathode access power ground；
Diode DoWith capacitance CoCommon end and resistance RrefSecond end be respectively two of automotive LED headlamp accesses
End；
The grid G of NMOS tube is the driving signal input of main circuit, resistance RrefWith the common end of automotive LED headlamp
For the echo signal output end of main circuit；
Inductance L1With inductance L2CCM patterns and DCM patterns, inductance L are worked in respectively1Inductance value be more than inductance L2Electricity
Inductance value.
As preferably, control circuit is realized using SI8271 family chips.
Automotive LED headlamp driver of the present invention based on improvement SEPIC Sofe Switch, main circuit is according to input
Drive signal drives automotive LED headlamp.Main circuit at the both ends of the existing switching tube for improving SEPIC circuits by increasing
If the mode of shunt capacitance makes switching tube be operated in Sofe Switch state, to reduce system loss, and then solves existing LED automobile
The low problem of the system effectiveness of headlamp driver.On the other hand, main circuit is realized based on improvement SEPIC circuits, is improved
SEPIC circuits not only have higher step-up ratio, but also with stable circuit structure and stronger anti-interference ability, Neng Goubao
Demonstrate,prove constant current output.Therefore, it is driven based on the automotive LED headlamp driver for improving SEPIC Sofe Switch using of the present invention
When dynamic automotive LED headlamp, it can ensure brightness and the brightness constancy of automotive LED headlamp simultaneously.
Description of the drawings
It will hereinafter come based on the embodiments and with reference to the accompanying drawings to of the present invention based on improving SEPIC Sofe Switch
Automotive LED headlamp driver is described in more detail, wherein：
Fig. 1 is the circuit theory based on the automotive LED headlamp driver for improving SEPIC Sofe Switch described in embodiment
Figure；
Fig. 2 is the first operation mode figure of the main circuit that embodiment refers to；
Fig. 3 is the second operation mode figure of the main circuit that embodiment refers to；
Fig. 4 is the third operation mode figure for the main circuit that embodiment refers to；
Fig. 5 is the 4th operation mode figure of the main circuit that embodiment refers to；
Fig. 6 is the 5th operation mode figure of the main circuit that embodiment refers to；
Fig. 7 is the synthesis oscillogram for the main circuit that embodiment refers to；
Fig. 8 is the static gain comparison diagram for the different topology structure that embodiment refers to；
Fig. 9 is the voltage signal and current signal waveform figure for the NMOS tube that embodiment refers to；
Figure 10 is the circuit diagram for the control circuit that embodiment refers to.
Specific implementation mode
Below in conjunction with attached drawing to of the present invention based on the automotive LED headlamp driver for improving SEPIC Sofe Switch
It is described further.
Embodiment：The present embodiment is explained in detail with reference to Fig. 1~Figure 10.
Referring to Fig.1, master is included based on the automotive LED headlamp driver for improving SEPIC Sofe Switch described in the present embodiment
Circuit, sample circuit, control circuit and driving circuit；
Main circuit is for driving automotive LED headlamp HL according to input drive signal；
The echo signal output end of main circuit is connected with the target signal input of sample circuit, the sampling letter of sample circuit
Number output end is connected with the sampled signal input of control circuit, and the driving signal output end of control circuit is through driving circuit and master
The driving signal input of circuit is connected；
The drive signal that driving circuit is used to export control circuit enhances, and can drive main circuit；
Main circuit has additional capacitance C on the basis of improving SEPIC circuitsQ, capacitance CQWith the switch for improving SEPIC circuits
Pipe is in parallel.
The main circuit of the present embodiment includes improving SEPIC circuits and capacitance CQ, it includes direct voltage source to improve SEPIC circuits
Vg, inductance L1, inductance L2, capacitance Cs, capacitance CM, capacitance Co, resistance Rref, diode DM, diode DoAnd switching tube；
Switching tube is band body diode DQNMOS tube, the drain D and source S of NMOS tube respectively with body diode DQThe moon
Pole is connected with anode；
Direct voltage source VgAnode with inductance L1First end be connected, inductance L1Second end simultaneously with capacitance Cs
One end, the drain D of NMOS tube, capacitance CQFirst end and diode DMAnode be connected, capacitance CsSecond end simultaneously with two poles
Pipe DoAnode and inductance L2First end be connected, diode DoCathode and capacitance CoFirst end be connected, inductance L2Second
End simultaneously with diode DMCathode and capacitance CMFirst end be connected, resistance RrefFirst end, capacitance CoSecond end, capacitance
CMSecond end, capacitance CQSecond end, the source S of NMOS tube and direct voltage source VgCathode access power ground；
Diode DoWith capacitance CoCommon end and resistance RrefSecond end be respectively two of automotive LED headlamp accesses
End；
The grid G of NMOS tube is the driving signal input of main circuit, resistance RrefWith the common end of automotive LED headlamp
For the echo signal output end of main circuit；
Inductance L1With inductance L2CCM patterns and DCM patterns, inductance L are worked in respectively1Inductance value be more than inductance L2Electricity
Inductance value.
The inductance of the present embodiment is planar inductor, and capacitance is patch capacitor.So design can not only reduce LED vapour
The volume of Chinese herbaceous peony illuminator driver, and power density can be improved.
The automotive LED headlamp driver based on improvement SEPIC Sofe Switch described in the present embodiment, diode DMAnd capacitance
CMConstitute voltage doubling unit, diode DoWith diode DMOperation mode it is consistent, capacitance CQAnd the parasitic capacitance of NMOS tube with electricity
Feel L2Constitute resonant network.In order to realize ZVS, i.e. Sofe Switch, inductance L1CCM patterns, inductance L need to be worked in2DCM need to be worked in
Pattern, to reduce the pulsation of input current.Capacitance CMWith capacitance CsCapacitance be sufficiently large, to ensure that capacitance both end voltage is permanent
It is fixed.Capacitance CoTo export electric capacity of voltage regulation.
The operation mode of the main circuit of the present embodiment is described in detail referring to Fig. 2~Fig. 7：
Fig. 2 is the first operation mode figure of main circuit.
First operation mode (t0-t1)：t0Moment, capacitance CQCharging complete.Inductance L1The energy of middle storage passes through diode
DMIt is transferred to capacitance CM, pass through diode DoIt is transferred to capacitance Co.Similarly, inductance L2The energy of middle storage passes through diode DMIt passes
It is defeated to arrive capacitance CM, pass through diode DoIt is transferred to capacitance Co.Due to inductance L1Inductance value be more than inductance L2Inductance value, inductance L1
On current fluctuation be less than inductance L2On current fluctuation.At this point, inductance L1The voltage and inductance L at both ends2The voltage at both ends is impartial
In capacitance CMBoth end voltage.Under this operation mode, diode D is flowed throughMWith diode DoElectric current linearly reduce, until subtract
Small when being zero, this operation mode terminates.
Fig. 3 is the second operation mode figure of main circuit.
Second operation mode (t1-t2)：Under this operation mode, diode DMAnd DoDiode is turned off.Capacitance CQAnd
The parasitic capacitance of NMOS tube and inductance L2Start resonance.As resonance current icWhen being zero, this operation mode terminates.Meanwhile NMOS tube
Drain D and source S between voltage resonance to zero.
Fig. 4 is the third operation mode figure of main circuit.
Third operation mode (t2-t3)：Since there are backward voltage, body diodes between the drain D and source S of NMOS tube
DQIt begins to turn on, inductance L1The voltage and inductance L at both ends2The voltage at both ends is equal to direct voltage source VgOutput voltage, inductance L1
With inductance L2The energy of middle storage and the electric current of process start linearly to increase.
Fig. 5 is the 4th operation mode figure of main circuit.
4th operation mode (t3-t4)：t3Moment, NMOS tube conducting realize no-voltage conducting, inductance L1With inductance L2On
Electric current still linearly increase, until NMOS tube end.
Fig. 6 is the 5th operation mode figure of main circuit.
5th operation mode (t4-t5)：t4Moment, NMOS tube cut-off, capacitance CQIt starts to charge up, the drain D of NMOS tube and source
Voltage between the S of pole increases.Due to capacitance CQCapacitance very little, this operation mode duration is very short.When the leakage of NMOS tube
Voltage between pole D and source S increases to and capacitance CMWhen both end voltage is consistent, capacitance CQCharging complete, this operation mode knot
Beam.
Fig. 7 is the synthesis oscillogram of main circuit.Wherein, vgsFor the voltage between the grid G and source S of NMOS tube, iDoFor
Flow through diode DoElectric current, iDMTo flow through diode DMElectric current, vdsFor the voltage between the drain D and source S of NMOS tube,
idsTo flow through the drain D of NMOS tube and the electric current of source S, iL1To flow through inductance L1Electric current, iL2To flow through inductance L2Electricity
Stream, vL1For inductance L1Both end voltage, vL2For inductance L2Both end voltage, VoFor the output voltage of main circuit, VgFor the grid of NMOS tube
Voltage between pole G and power ground.
Before the LED automobile based on improvement SEPIC Sofe Switch described in the present embodiment is described in detail referring to Fig. 8 and Fig. 9
The effect of illuminator driver：
Fig. 8 is the static gain comparison diagram of different topology structure.As shown in figure 8, in the duty ratio model that Sofe Switch can be achieved
In enclosing, the static gain of the improvement SEPIC of the present embodiment is more than the static state of existing boost topological structures and SEPIC topological structures
Gain.It can thus be appreciated that：Compared with existing boost topological structures and SEPIC topological structures, main circuit of the invention is in step-up ratio
Aspect tool has great advantage, and extremely meets the lighting requirement of car headlamp.
The main circuit of the present embodiment adds the side of shunt capacitance by the both ends of the switching tube in existing improvement SEPIC circuits
Formula realizes the no-voltage conducting of switching tube, reduces the switching loss of switching tube.The 36W LED built according to laboratory
Driver object test the result shows that, which is up to 90.91% in full load efficiency.Flow through the drain D and source S of NMOS tube
Current waveform and the drain D and source S of NMOS tube between voltage waveform it is as shown in Figure 9.
The control principle of the main circuit of the present embodiment is：
According to inductance L in Fig. 71Both end voltage and inductance L2The waveform of both end voltage can be pushed away using voltage-second balance principle
The transmission function of main circuit under the conditions of export Sofe Switch：
In formula, D is conducting dutycycle, Dd=td/ T, td=t1-t0, Db=tb/ T, tb=t3-t2, T is switch periods.
According to the transmission function of main circuit it is found that the system output voltage is constant under soft switching conditions, but soft opened non-
Circuit output can be adjusted by adjusting duty ratio D under the conditions of pass, realize closed-loop control.
Described in the present embodiment is based on the working frequency of automotive LED headlamp driver for improving SEPIC Sofe Switch
1MHz.For high frequency LED driver, the control circuit of switching tube is particularly significant, never drive signal delay and distortion
The problems such as generation.The control circuit of the present embodiment using SI8271 chips realize, and using turn pressure chip LM7805 and
LP2985 realizes the break-make control of switch tube as accessory power supply.The circuit diagram of control circuit is as shown in Figure 10.
Although describing the present invention herein with reference to specific embodiment, it should be understood that, these realities
It is the example of principles and applications to apply example only.It should therefore be understood that can be permitted exemplary embodiment
More modifications, and can be designed that other arrangements, spirit without departing from the present invention as defined in the appended claims and
Range.It should be understood that can be by combining different appurtenances different from mode described in original claim
It is required that and feature described herein.It will also be appreciated that the feature in conjunction with described in separate embodiments can be used at it
In his embodiment.
Claims (3)
1. based on the automotive LED headlamp driver for improving SEPIC Sofe Switch, the automotive LED headlamp driver includes master
Circuit, sample circuit, control circuit and driving circuit；
Main circuit is for driving automotive LED headlamp according to input drive signal；
The echo signal output end of main circuit is connected with the target signal input of sample circuit, and the sampled signal of sample circuit is defeated
Outlet is connected with the sampled signal input of control circuit, and the driving signal output end of control circuit is through driving circuit and main circuit
Driving signal input be connected；
The drive signal that driving circuit is used to export control circuit enhances, and can drive main circuit；
It is characterized in that, main circuit has additional capacitance C on the basis of improving SEPIC circuitsQ, capacitance CQWith improvement SEPIC circuits
Paralleled power switches.
2. as described in claim 1 based on the automotive LED headlamp driver for improving SEPIC Sofe Switch, which is characterized in that main
Circuit includes improving SEPIC circuits and capacitance CQ, it includes direct voltage source V to improve SEPIC circuitsg, inductance L1, inductance L2, capacitance
Cs, capacitance CM, capacitance Co, resistance Rref, diode DM, diode DoAnd switching tube；
Switching tube is band body diode DQNMOS tube, the drain D and source S of NMOS tube respectively with body diode DQCathode and
Anode is connected；
Direct voltage source VgAnode with inductance L1First end be connected, inductance L1Second end simultaneously with capacitance CsFirst end,
The drain D of NMOS tube, capacitance CQFirst end and diode DMAnode be connected, capacitance CsSecond end simultaneously with diode Do
Anode and inductance L2First end be connected, diode DoCathode and capacitance CoFirst end be connected, inductance L2Second end it is same
When with diode DMCathode and capacitance CMFirst end be connected, resistance RrefFirst end, capacitance CoSecond end, capacitance CM's
Second end, capacitance CQSecond end, the source S of NMOS tube and direct voltage source VgCathode access power ground；
Diode DoWith capacitance CoCommon end and resistance RrefSecond end be respectively automotive LED headlamp two incoming ends；
The grid G of NMOS tube is the driving signal input of main circuit, resistance RrefBased on the common end of automotive LED headlamp
The echo signal output end of circuit；
Inductance L1With inductance L2CCM patterns and DCM patterns, inductance L are worked in respectively1Inductance value be more than inductance L2Inductance value.
3. as claimed in claim 2 based on the automotive LED headlamp driver for improving SEPIC Sofe Switch, which is characterized in that control
Circuit processed is realized using SI8271 family chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810505713.1A CN108684104B (en) | 2018-05-23 | 2018-05-23 | L ED automobile headlamp driver based on improved SEPIC soft switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810505713.1A CN108684104B (en) | 2018-05-23 | 2018-05-23 | L ED automobile headlamp driver based on improved SEPIC soft switch |
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| CN109951072A (en) * | 2019-03-26 | 2019-06-28 | 哈尔滨工业大学 | Novel Soft Switching high step-up ratio converter and its working method based on Sepic circuit |
| CN110012574A (en) * | 2019-04-19 | 2019-07-12 | 福州大学 | A kind of mixing control LED drive circuit of the single-stage without bridge Sepic and LLC |
| CN110011543A (en) * | 2019-04-26 | 2019-07-12 | 哈尔滨工业大学 | Based on the high step-up ratio DC/DC converter for improving SEPIC circuit |
| CN110831291A (en) * | 2019-11-22 | 2020-02-21 | 哈尔滨工业大学 | Sepic soft switch-based LED driver and hybrid driving method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109951072A (en) * | 2019-03-26 | 2019-06-28 | 哈尔滨工业大学 | Novel Soft Switching high step-up ratio converter and its working method based on Sepic circuit |
| CN110012574A (en) * | 2019-04-19 | 2019-07-12 | 福州大学 | A kind of mixing control LED drive circuit of the single-stage without bridge Sepic and LLC |
| CN110012574B (en) * | 2019-04-19 | 2021-06-01 | 福州大学 | LED drive circuit of hybrid control single-stage bridgeless Sepic and LLC |
| CN110011543A (en) * | 2019-04-26 | 2019-07-12 | 哈尔滨工业大学 | Based on the high step-up ratio DC/DC converter for improving SEPIC circuit |
| CN110831291A (en) * | 2019-11-22 | 2020-02-21 | 哈尔滨工业大学 | Sepic soft switch-based LED driver and hybrid driving method thereof |
| CN110831291B (en) * | 2019-11-22 | 2021-07-20 | 哈尔滨工业大学 | Sepic soft switch-based LED driver and hybrid driving method thereof |
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