CN107509280B - A kind of high-frequency isolation type LED drive circuit and its control method - Google Patents
A kind of high-frequency isolation type LED drive circuit and its control method Download PDFInfo
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- CN107509280B CN107509280B CN201710882730.2A CN201710882730A CN107509280B CN 107509280 B CN107509280 B CN 107509280B CN 201710882730 A CN201710882730 A CN 201710882730A CN 107509280 B CN107509280 B CN 107509280B
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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
-
- 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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
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- 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)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of high-frequency isolation type LED drive circuit and its control methods, belong to power electronics field.Purpose is to propose a kind of novel unipolar alternate high-frequency isolation type topology, using Zero-voltage soft switch technology, has the characteristics that high conversion efficiency, Harmonics of Input content are low and power factor is high.LED drive circuit includes rectifier bridge, main power tube, auxiliary switch pipe, boost inductance, parasitic capacitance, anti-paralleled diode, clamp capacitor, parasitic diode, isolating transformer, resonant inductance, primary side capacitor, the secondary rectifier diode in capacitor, the first pair, the second secondary side rectifier diode, output capacitance；Control method is realized by the way of main switch in a switch periods and auxiliary switch pipe complementation conducting.
Description
Technical field
Present invention relates particularly to a kind of high-frequency isolation type LED drive circuit and its control methods, belong to power electronic technique
Field.
Background technique
Light emitting diode (LED) has many advantages, such as that high-efficient, the service life is long, pollution-free, small in size, before having a wide range of applications
Scape.LED driving is used as its core component, has become research hotspot at present.Develop long-life, High Power Factor, low cost and height
Reliability, and it is able to satisfy the LED drive power for the IEC61000-3-2 harmonic standard that International Power is organized to set up, it has also become hair
The inexorable trend of exhibition.
Realize that the LED drive power of AC/DC constant pressure and flow output has single stage shift and Two Stages scheme at present.Using two
PFC function is realized in the LED drive power of grade power conversion, prime AC/DC transformation, and rear class DC/DC realizes DC voltage regulation function
Can, but due to being converted by two stage power, efficiency is relatively low.Single-stage solution generally uses the topological realizations function such as flyback (Flyback)
Rate factor (Power Factor Correction, PFC) and output voltage is adjusted, since it is merely through level-one power conversion,
Have many advantages, such as that high conversion efficiency, control are simple, inexpensive.
This programme proposes a kind of new one-stage topology scheme, and it is low high with power factor to be able to achieve Harmonics of Input content
Effect.
Summary of the invention
Therefore, the present invention is directed to above-mentioned deficiency in the prior art, proposes a kind of novel unipolar alternate high-frequency isolation type topology, adopts
With Zero-voltage soft switch technology, have the characteristics that high conversion efficiency, Harmonics of Input content are low and power factor is high.
Specifically, the present invention provides a kind of high-frequency isolation type LED drive circuit, including rectifier bridge, the high-frequency isolation
Type LED drive circuit further include main power tube, auxiliary switch pipe, boost inductance, parasitic capacitance, anti-paralleled diode, clamp capacitor,
Parasitic diode, isolating transformer, resonant inductance, primary side capacitor, the secondary rectifier diode in capacitor, the first pair, the second secondary side
Rectifier diode, output capacitance；
Main power tube one end is connected between resonant capacitance and boost inductance, and the other end is connected to transformer primary side negative terminal.
After auxiliary switch pipe and clamp capacitor series connection, one end is connected between resonant capacitance and boost inductance, and the other end is connected to transformer
Primary side negative terminal.Boost inductance is connected between rectifier bridge and the collector of main power tube, and parasitic capacitance is in parallel with main power tube, instead
Parallel diode is connect with main power tube inverse parallel, and clamp capacitor is connected with the collector of auxiliary switch pipe, parasitic diode with it is auxiliary
Switching tube inverse parallel connection, primary side capacitor are connected to the emitter and isolating transformer of auxiliary switch pipe after connecting with resonant inductance
Between primary side；The secondary rectifier diode when capacitor and second are secondary is connected on the secondary side cathode output end of isolating transformer, and first is secondary
While rectifier diode be connected to isolating transformer it is secondary while cathode output end and secondary side capacitor between, output capacitance is connected to isolation
Transformer it is secondary when cathode output end and first are secondary between rectifier diode, first is secondary whole when rectifier diode is secondary with second
The conducting direction for flowing diode is opposite.
Further, the rectifier bridge includes the full bridge rectifier of four input rectifying diodes composition.
The present invention also provides a kind of based on a kind of above-mentioned high-frequency isolation type LED drive of high-frequency isolation type LED drive circuit
Dynamic circuit control method, the control method realize that the duty cycle specifically includes by the control duty cycle:
First stage:
Main power tube conducting, the shutdown of auxiliary switch pipe, boost inductor current is linearly increasing, and resonant inductance electric current reduces, side
To being positive, resonant capacitor voltage increases；Transformer secondary side current is negative and progressively increases to zero；Second secondary side rectifier diode is led
Logical, secondary side capacitance voltage increases, output capacitance charging, and output voltage increases；This state is continued until resonant inductance electric current
It is reduced to zero；
Second stage:
Main power tube is held on, and auxiliary switch pipe is held off, and input inductive current keeps linearly increasing, resonant inductance electricity
Stream is by just becoming negative, and primary side capacitor starts to discharge, and primary side capacitance voltage starts to reduce；Transformer secondary side current is become just by negative, and first
Secondary side rectifier diode conducting, secondary side capacitor start to discharge, and secondary side capacitance voltage reduces.Second secondary side rectifier diode cut-off,
The output voltage of output capacitance reduces；
Phase III:
Main power tube shutdown, auxiliary switch pipe are held off, and boost inductor current starts linearly to reduce, and resonant inductance electric current is opened
Begin to increase, but is still negative value；Boost inductor current charges to the parasitic capacitance of main power tube, and parasitic capacitor voltage starts to rise
It is high；First secondary side rectifier diode is constantly on, and secondary side capacitor starts to discharge, and secondary side capacitance voltage reduces, output capacitance it is defeated
Voltage reduces out；Resonant inductance electric current, which starts slowly to be increased up, becomes zero；
Fourth stage:
Main power tube and auxiliary switch pipe are held off；Boost inductor current keeps linear and reduces；Resonant inductance electric current is by zero
Start to increase；First secondary side rectifier diode cut-off, the second secondary side rectifier diode is begun to turn on, and gives secondary side capacitor charging,
Secondary side capacitance voltage starts to increase, and the output voltage of output capacitance increases；When the parasitic capacitor voltage of main power tube is greater than or waits
When clamp capacitor voltage, the parasitic diode of auxiliary switch pipe is begun to turn on, and starts to charge to clamp capacitor；Until auxiliary switch pipe
It begins to turn on；
5th stage:
Auxiliary switch pipe is open-minded, and since the parasitic diode of auxiliary switch pipe has been turned on, it is open-minded that auxiliary switch pipe is in no-voltage
State, while clamp capacitor starts to discharge；Resonant inductance electric current continues to increase；Second secondary side rectifier diode is held on, secondary
Side capacitance voltage increases, and the output voltage of output capacitance increases；Boost inductor current keeps linear and reduces；
6th stage:
The shutdown of auxiliary switch pipe；Resonant inductance electric current starts to reduce；Second secondary side rectifier diode is held on, output capacitance
Output voltage increase, secondary side capacitance voltage increases；Boost inductor current keeps linear and reduces；If the energy stored in resonant inductance
Amount is greater than the energy of parasitic capacitance storage, and parasitic capacitor voltage will be discharged to zero, at this time the anti-paralleled diode of main power tube
Conducting；If opening main power tube at this time, main power tube is in no-voltage opening state, another period starts.
The beneficial effects of the present invention are: a kind of high-frequency isolation type LED drive circuit provided by the invention and its controlling party
Method, single stage shift and Two Stages scheme compared with the prior art, have high conversion efficiency, Harmonics of Input content low and
The features such as power factor is high has very high application value.
Detailed description of the invention
Fig. 1 is a kind of circuit topology figure of high-frequency isolation type LED drive circuit of the present invention；
Fig. 2 is a kind of complete period schematic diagram of the control method of high-frequency isolation type LED drive circuit of the present invention；
Fig. 3 is the equivalent circuit diagram of first stage；
Fig. 4 is the equivalent circuit diagram of second stage；
Fig. 5 is the equivalent circuit diagram of phase III；
Fig. 6 is the equivalent circuit diagram of fourth stage；
Fig. 7 is the equivalent circuit diagram in the 5th stage；
Fig. 8 is the equivalent circuit diagram in the 6th stage；
Fig. 9 a, Fig. 9 b are respectively the drive waveforms and voltage stress waveform diagram of main switch and auxiliary switch pipe；
Figure 10 is output power from zero load to when being fully loaded with (60W), and when input voltage is respectively 220V, LED driver turns
Change efficiency chart；
Figure 11 is input voltage when being respectively 220V, and output power is from zero load to full load when (60W), input current abnormality
Rate figure.
Specific embodiment
Description of specific embodiments of the present invention with reference to the accompanying drawing:
The present embodiment proposes that a kind of novel unipolar alternate high-frequency isolation type topology is had and converted using Zero-voltage soft switch technology
High-efficient, the features such as Harmonics of Input content is low and power factor is high, circuit topology is as shown in Figure 1.
Main circuit part, which uses, is based on active clamp isolated soft switching scheme.By input rectifying diode D1~D4Composition
Rectifier bridge, main power tube Q1, auxiliary switch pipe Q2, boost inductance L, power tube parasitic capacitance Cr, high-frequency isolation transformer T1, it is humorous
Shake inductance Lr, primary side capacitor CP, pair side capacitor CSWith rectifier diode D5And D6, output capacitance CoutIt constitutes.Supervisor and auxiliary pipe are pressed
Mode is opened according to complementation to work, and the ZVS no-voltage conducting of two switching tubes may be implemented.Resonant inductance LrWith primary side capacitor CPStructure
At resonance circuit, resonance frequency can be greater than, be less than or equal to switching frequency.As shown in Fig. 2, with resonance frequency lower than switch frequency
It is analyzed for rate, point six stages.
First stage (t0-t1):
t0Moment, main power tube Q1Conducting, auxiliary switch pipe Q2 shutdown, inputs inductive current iLIt is linearly increasing, resonant inductance electricity
Flow iLrReduce, but its direction is positive, resonant capacitor voltage UCpIncrease.Transformer secondary side current is negative, and progressively increases to zero.
Diode D6Conducting, capacitance voltage UCsIt increases, output capacitance CoutCharging, and voltage UoutIncrease.Its equivalent circuit diagram such as Fig. 3
It is shown.This state is continued until t1Moment, resonant inductance electric current iLrIt is reduced to zero.
Second stage (t1-t2):
t1Moment, main power tube Q1It is held on, auxiliary switch pipe Q2It is held off, inputs inductive current iLIt keeps linear to increase
Add, resonant inductance electric current iLrBy just becoming negative, capacitor CpStart to discharge, resonant capacitor voltage UCpStart to reduce.Transformer secondary electricity
Stream is become just by negative, secondary side diode D5Conducting, capacitor CSStart to discharge, capacitance voltage UCsReduce, output capacitance voltage UoutSubtract
It is small.Its equivalent circuit diagram is as shown in Figure 4.
Phase III (t2-t3):
t2Moment, main power tube start Q1Shutdown, auxiliary switch pipe Q2It is held off, inputs inductive current iLStart linearly to subtract
It is small, resonant inductance electric current iLrStart to increase, but is still negative value.Inductive current iLGive main power tube Q1Parasitic capacitance CrCharging, electricity
Hold voltage UCrStart to increase.Secondary side diode D5Constantly on, capacitor Cs starts to discharge, capacitance voltage UCsReduce, diode D6
Cut-off, output voltage voltage UoutReduce.Resonant inductance electric current iLrStart slowly to be increased up t3Moment becomes zero.This charged
The journey time is shorter, inputs inductive current i in the processLSize is held essentially constant.Its equivalent circuit diagram is as shown in Figure 5.
Fourth stage (t3-t4):
t3Moment, main power tube Q1With auxiliary switch pipe Q2It is held off.Input inductive current iLIt keeps linear to reduce.Resonance
Inductive current iLrStart to increase by zero.Secondary side diode D6It begins to turn on, and charges to capacitor Cs, capacitance voltage UCsStart
Increase, output capacitance voltage UoutIncrease.As main power tube parasitic capacitor voltage UcrVoltage is greater than or equal to clamp capacitor voltage Uc
When, auxiliary pipe Q2Parasitic diode is begun to turn on, and starts to give clamp capacitor CcCharging.Until t4Moment, auxiliary pipe Q2It begins to turn on.Its
Equivalent circuit diagram is as shown in Figure 6.
5th stage (t4-t5):
t4Moment, auxiliary switch pipe Q2Open-minded, since the anti-paralleled diode of auxiliary switch pipe has been turned on, auxiliary switch pipe is in
No-voltage (ZVS) opening state, clamp capacitor CCStart to discharge, resonant inductance electric current iLrContinue to increase.Diode D6Holding is led
It is logical, capacitance voltage UCsIt increases, output capacitance voltage UoutIncrease.Input inductive current iLIt keeps linear to reduce.Its equivalent circuit diagram
As shown in Figure 7.
6th stage (t5-t6):
t5Moment, auxiliary switch pipe Q2Shutdown.Resonant inductance electric current iLrStart to reduce.Diode D6It is held on, output capacitance
Voltage UoutIt increases, capacitance voltage UCsIncrease.Input inductive current iLIt keeps linear to reduce.Assuming that resonant inductance LrMiddle storage
Energy is greater than parasitic capacitance CrThe energy of storage, parasitic capacitor voltage will be discharged to zero, at this time the inverse parallel two of main power tube
Pole pipe conducting.If opening main power tube at this time, main power tube is in no-voltage opening state.t6Open Q1, another period opens
Begin.Its equivalent circuit diagram is as shown in Figure 8.
Fig. 9 a is main switch Q1 driving and voltage stress waveform, and as seen from the figure, when power tube is opened, voltage stress is close
In zero, it is in no-voltage opening state.Equally, switch tube zero voltage opens waveform supplemented by Fig. 9 b.
It has built 60W LED driving model machine and has carried out experimental verification, wherein output is 48V/1.3A, switching frequency 85kHZ.
Figure 10 is that LED drives conversion efficiency curve.
Figure 10 is output power from zero load to when being fully loaded with (60W), and when input voltage is respectively 220V, LED driver turns
Efficiency chart is changed, as seen from the figure, peak efficiency reaches 95.4%.
Figure 11 is input voltage when being respectively 220V, and output power is from zero load to full load when (60W), input current abnormality
Rate, as seen from the figure, input current abnormality rate minimum 3.1%.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (1)
1. a kind of high-frequency isolation type LED drive circuit control method of high-frequency isolation type LED drive circuit, passes through high-frequency isolation type
LED drive circuit realizes that high-frequency isolation type LED drive circuit includes rectifier bridge, main power tube, auxiliary switch pipe, boost inductance, posts
Raw capacitor, anti-paralleled diode, clamp capacitor, parasitic diode, isolating transformer, resonant inductance, primary side capacitor, secondary side electricity
Hold, the first secondary rectifier diode, output capacitance in rectifier diode, the second pair；
Main power tube one end is connected between resonant capacitance and boost inductance, and the other end is connected to transformer primary side negative terminal；It is auxiliary to open
After closing pipe and clamp capacitor series connection, one end is connected between resonant capacitance and boost inductance, and the other end is connected to transformer primary side
Negative terminal；Boost inductance is connected between rectifier bridge and the collector of main power tube, and parasitic capacitance is in parallel with main power tube, inverse parallel
Diode is connect with main power tube inverse parallel, and clamp capacitor is connected with the collector of auxiliary switch pipe, parasitic diode and auxiliary switch
Pipe inverse parallel connection, primary side capacitor are connected to the emitter of auxiliary switch pipe and the primary side of isolating transformer after connecting with resonant inductance
Between；The secondary rectifier diode when capacitor and second are secondary is connected on the secondary side cathode output end of isolating transformer, and the first secondary side is whole
Stream diode be connected to isolating transformer it is secondary in cathode output end and it is secondary while capacitor between, output capacitance is connected to isolation transformation
Device it is secondary when cathode output end and first are secondary between rectifier diode, first secondary rectifies two when rectifier diode is with the second pair
The conducting direction of pole pipe is opposite；
It is characterized in that, the control method is realized by the control duty cycle, the duty cycle is specifically included:
First stage:
Main power tube conducting, the shutdown of auxiliary switch pipe, boost inductor current is linearly increasing, and resonant inductance electric current reduces, and direction is
Just, resonant capacitor voltage increases；Transformer secondary side current is negative and progressively increases to zero；Second secondary side rectifier diode conducting,
Secondary side capacitance voltage increases, output capacitance charging, and output voltage increases；This state is continued until that resonant inductance electric current reduces
To zero；
Second stage:
Main power tube is held on, and auxiliary switch pipe is held off, input inductive current keep it is linearly increasing, resonant inductance electric current by
Positive to become negative, primary side capacitor starts to discharge, and primary side capacitance voltage starts to reduce；Transformer secondary side current is become just by negative, the first secondary side
Rectifier diode conducting, secondary side capacitor start to discharge, and secondary side capacitance voltage reduces, the second secondary side rectifier diode cut-off, output
The output voltage of capacitor reduces；
Phase III:
Main power tube shutdown, auxiliary switch pipe are held off, and boost inductor current starts linearly to reduce, and resonant inductance electric current starts to increase
Add, but is still negative value；Boost inductor current charges to the parasitic capacitance of main power tube, and parasitic capacitor voltage starts to increase；The
One secondary side rectifier diode is constantly on, and secondary side capacitor starts to discharge, and secondary side capacitance voltage reduces, the output voltage of output capacitance
Reduce；Resonant inductance electric current, which starts slowly to be increased up, becomes zero；
Fourth stage:
Main power tube and auxiliary switch pipe are held off；Boost inductor current keeps linear and reduces；Resonant inductance electric current is by zero
Increase；First secondary side rectifier diode cut-off, the second secondary side rectifier diode is begun to turn on, and gives secondary side capacitor charging, secondary side
Capacitance voltage starts to increase, and the output voltage of output capacitance increases；When the parasitic capacitor voltage of main power tube is greater than or equal to pincers
When the capacitance voltage of position, the parasitic diode of auxiliary switch pipe is begun to turn on, and starts to charge to clamp capacitor；Until auxiliary switch pipe starts
Conducting；
5th stage:
Auxiliary switch pipe is open-minded, and since the parasitic diode of auxiliary switch pipe has been turned on, auxiliary switch pipe is in no-voltage opening state,
Clamp capacitor starts to discharge simultaneously；Resonant inductance electric current continues to increase；Second secondary side rectifier diode is held on, secondary side capacitor
Voltage increases, and the output voltage of output capacitance increases；Boost inductor current keeps linear and reduces；
6th stage:
The shutdown of auxiliary switch pipe；Resonant inductance electric current starts to reduce；Second secondary side rectifier diode is held on, output capacitance it is defeated
Voltage increases out, and secondary side capacitance voltage increases；Boost inductor current keeps linear and reduces；If the energy stored in resonant inductance is big
In the energy of parasitic capacitance storage, parasitic capacitor voltage will be discharged to zero, at this time the anti-paralleled diode conducting of main power tube；
If opening main power tube at this time, main power tube is in no-voltage opening state, another period starts.
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| CN108200692A (en) * | 2018-01-28 | 2018-06-22 | 程桂平 | A kind of LED driving circuit |
| CN109120165B (en) * | 2018-11-06 | 2024-03-01 | 南京熊猫电子股份有限公司 | Isolated three-phase AC/DC converter and control method thereof |
| CN109510485B (en) * | 2018-11-15 | 2021-04-02 | 科世达（上海）管理有限公司 | Power supply circuit and pre-charging control method of clamping capacitor of power supply circuit |
| CN110649802B (en) * | 2019-08-22 | 2021-02-05 | 东莞理工学院 | Correction method of single-stage resonant AC-DC power factor correction conversion device |
| CN111355365A (en) * | 2020-03-20 | 2020-06-30 | 广东工业大学 | Power factor correction AC-DC converter |
| CN111541372B (en) * | 2020-05-13 | 2023-04-07 | 东莞理工学院 | Bidirectional DC/DC topological circuit based on three switches and control method |
| CN113179021B (en) * | 2021-04-28 | 2022-07-01 | 中国民航大学 | Two-switch AC/DC LED driving device based on Flyback-Class E converter |
| CN114221549B (en) * | 2021-11-30 | 2024-01-12 | 广州金升阳科技有限公司 | Control method of cascade circuit |
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| CN204559941U (en) * | 2015-03-24 | 2015-08-12 | 威海海泰电子有限公司 | A kind of New LED driving power |
| CN106887945A (en) * | 2017-04-10 | 2017-06-23 | 东莞理工学院 | Single-stage resonant mode isolates Sofe Switch boosting power factor correction circuit and bearing calibration |
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