CN104779820A - Single-stage AC-DC resonant converter - Google Patents

Single-stage AC-DC resonant converter Download PDF

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Publication number
CN104779820A
CN104779820A CN201510182035.6A CN201510182035A CN104779820A CN 104779820 A CN104779820 A CN 104779820A CN 201510182035 A CN201510182035 A CN 201510182035A CN 104779820 A CN104779820 A CN 104779820A
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China
Prior art keywords
circuit
resonant
output
stage
diode
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Pending
Application number
CN201510182035.6A
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Chinese (zh)
Inventor
史永胜
高丹阳
郝鹏飞
宁青菊
胡双
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Shaanxi University of Science and Technology
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Shaanxi University of Science and Technology
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Priority to CN201510182035.6A priority Critical patent/CN104779820A/en
Publication of CN104779820A publication Critical patent/CN104779820A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • 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
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • 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
    • H02M3/338—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 in a self-oscillating arrangement
    • 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)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a single-stage AC-DC resonant converter which controls two converters by a control signal, wherein a prime converter is a power factor correction circuit and a post converter is an LLC resonant DC-DC converter; a prime power factor correction circuit is a booster circuit and a post power factor correction circuit is a DC converter. The two converters are connected together to reduce the loss of the whole system; the two converters are connected by a public capacitor which plays a balance role between the two converters so as to reduce voltage drift; due to the two converters, the public capacitor can keep balance in a voltage-resisting area and the circuit can run normally. In the structure, the prime booster circuit has the advantages of simple structure and small loss, and the post LLC resonant converter has the advantages of simple structure, low noise and loss, and high conversion efficiency.

Description

A kind of single-stage AC-DC controlled resonant converter
Technical field
The invention belongs to switch power technology field, be specifically related to a kind of single-stage AC-DC controlled resonant converter.
Background technology
Energy conversion efficiency becomes the focus of people's research in recent years, circuit of power factor correction AC-DC converter part belongs to the one of energy conversion circuit, be widely used in Switching Power Supply, as electric operation power and distributed power source etc., it is the bridge connecting bridge rectifier and electrical network, and the use of bridge rectifier can produce the harmonic wave of can not ignore and idle in electrical network, electrical network is formed and pollutes, affect power supply quality, so how harmonic inhabitation improves electromagnetic compatibility problem become study hotspot, and circuit of power factor correction can effectively overcome the above problems, thus the utilization also along with power electronics is more and more extensive.
Power factor correction technology refers to and adopts suitable topological structure and control device, improves power electronic equipment, makes input current consistent with voltage-phase, not to input harmonics of electric power network, in AC-DC transfer process, obtain lower THD, make power factor close to 1.Power factor correction is divided into Active Power Factor Correction and AC-DC conversion, circuit of power factor correction inserts correction link between electrical network and load makes input current waveform approach input voltage waveform, to improve power factor and to limit the pollution of harmonic current to electrical network.
AC-DC switch technology adopts passive component improve input power factor and reduce current harmonics, and the general inductance that adopts reduces the interchange fundamental current of input and the phase difference of voltage, adopts the method compensated that power factor is improved.Active Power Factor Correction Technology adopts full-controlled switch device formation integrated circuit, and its adopts feedback technique to make the waveform tracking of input current exchange input sine wave shape.
LLC resonance DC-DC converter works in Sofe Switch state, namely former limit switching tube realizes no-voltage and opens (ZVS), secondary rectifying tube realizes zero-current switching (ZCS), thus reduction switching loss, improve transducer effciency, for converter high frequency provides possibility, reduce the volume and weight of converter further, improve power density and the dynamic property of converter, improve electromagnetic compatibility simultaneously, play rectifying and wave-filtering effect.
Summary of the invention
The object of the invention is to solve above-mentioned the problems of the prior art, provide a kind of good wave filtering effect, low noise, the single-stage AC-DC controlled resonant converter that conversion efficiency is high.
To achieve these goals, the present invention is achieved by the following technical solutions:
A kind of single-stage AC-DC controlled resonant converter, comprises the AC-DC change-over circuit of prime and the LLC resonant circuit of rear class; AC-DC change-over circuit comprises communication power supply, bridge rectifier, be used for the input inductance of storage power, switching tube and public capacitance; The output of AC-DC change-over circuit connects LLC resonant circuit, LLC resonant circuit comprises the resonant tank being connected to transformer primary side winding side, and be connected to the current rectifying and wave filtering circuit of transformer secondary winding side, the output resistance as whole circuit output end in parallel on the output of current rectifying and wave filtering circuit.
The particular circuit configurations of described circuit of power factor correction is:
The output of communication power supply is connected on the input of bridge rectifier, and an output of bridge rectifier is connected to one end of input inductance, and another output is connected to the source electrode of second switch pipe; The source electrode of the first switching tube and the drain electrode of second switch pipe are all connected on the other end of input inductance; Public capacitance is connected in parallel between the source electrode of second switch pipe and drain electrode; The input of LLC resonant circuit is connected on the two ends of public capacitance.
Described resonant tank comprises resonant capacitance, resonant inductance and magnetizing inductance; Resonant capacitance is connected to one end of transformer primary side winding after connecting with resonant inductance, the other end of transformer primary side winding is connected with the output of circuit of power factor correction as the input of resonant tank with resonant capacitance; Magnetizing inductance is connected in parallel on the two ends of transformer primary side winding.
Described current rectifying and wave filtering circuit comprises two diodes and output filter capacitor; The two ends of transformer secondary winding are connected with the anode of the first diode with the second diode respectively, and output filter capacitor is connected in parallel between the negative electrode of the first diode and the negative electrode of the second diode; Output resistance is connected in parallel on the two ends of output filter capacitor as output.
Described first diode and the second diode are rectifier diode.
Compared with prior art, the present invention has following beneficial effect:
Type AC-DC converter of the present invention, circuit of power factor correction is connected with LLC resonant circuit, power output between this two-stage circuit is balanced by public capacitance, when the power of prime booster circuit is greater than the power output of rear class LLC resonant converter, the voltage of public capacitance will rise, until two stage power is equal, such design decreases the loss of whole system, decrease the voltage drift of whole system, 2 stage converter makes this public capacitance in withstand voltage region, keep balance, and circuit can normally be worked.
The present invention only controls two-stage circuit by a kind of control signal, decrease the complexity of loss and Switching Power Supply, electromagnetic compatibility problem is improved significantly, filtering fractional harmonic, ensure low noise, and the efficiency of this kind of design is compared with general AC-DC converter, when bearing identical load, efficiency will exceed 20% nearly.Type AC-DC converter of the present invention, is connected circuit of power factor correction with LLC resonant circuit, better can improve electromagnetic compatibility problem, filtering harmonic wave, and noise decrease, raises the efficiency.
Accompanying drawing explanation
Fig. 1 is circuit topological structure figure of the present invention;
Fig. 2 is the oscillogram in circuit of power factor correction stage of the present invention;
Fig. 3 is the equivalent circuit diagram in LLC resonant circuit stage of the present invention;
Fig. 4 is LLC resonant circuit stage oscillogram of the present invention;
Fig. 5 of the present inventionly adds the transformer configuration figure after control signal;
Fig. 6 does not analyze illustration through circuit of power factor correction THD;
Fig. 7 is that THD of the present invention analyzes illustration;
Fig. 8 is of the present invention and traditional power factor correction circuit efficiency comparison diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
See Fig. 1, prime of the present invention adopts AC-DC change-over circuit, and comprise communication power supply, bridge rectifier, be used for the input inductance of storage power, switching tube and public capacitance, rear class adopts LLC resonant circuit, i.e. DC-DC change-over circuit, comprises resonant tank, transformer and current rectifying and wave filtering circuit.
Particular circuit configurations comprises communication power supply, bridge rectifier, input inductance L in, the first switching tube Q1, second switch pipe Q2, public capacitance Cb, resonant capacitance Cr, resonant inductance Lr, magnetizing inductance Lm, transformer T, the first rectifier diode D1, the second rectifier diode D2, output filter capacitor Co, output resistance Ro;
Communication power supply is connected with bridge rectifier, bridge rectifier is connected with second switch pipe Q2 with input inductance, input inductance is connected with public capacitance Cb, and two switching tubes connect input inductance and public capacitance, and connect the resonant tank in DC-DC change-over circuit after inputting inductance.Two switching tubes control prime booster circuit and rear class DC converting circuit respectively, and two switching tubes are controlled by same control signal.Public capacitance is used for balancing the voltage of front and back stages circuit, and when the power output of prime booster circuit is greater than the power of rear class DC transfer circuit, public capacitance voltage will raise until two stage power is equal.Resonant tank can regard half-bridge resonance structure, and LLC resonant tank is by transformer and output rectifier and filter coupling.Resonant tank comprises series resonant capacitance, series resonance inductor and shunt excitation inductance, parallel resonant inductor and transformer primary side winding parallel; Transformer T former limit winding and resonant capacitance Cr connect, series resonance inductor is the leakage inductance of transformer primary side, parallel resonant inductor is the magnetizing inductance of transformer, transformer T vice-side winding meets the first rectifier diode D1 and the second rectifier diode D2 respectively, vice-side winding parallel filtering electric capacity Co, output loading Ro; Current rectifying and wave filtering circuit is full-wave rectification.
AC-DC translation circuit of the present invention is a kind of booster circuit, and DC-DC conversion circuit is a kind of DC transfer circuit; Prime AC-DC translation circuit is connected by public capacitance with rear class DC-DC conversion circuit.
Principle of the present invention and the course of work:
As shown in Figure 2, this figure is PFC level stage current-voltage waveform figure:
[t 1-t 2] stage: second switch pipe Q2 is open-minded when t1, and the voltage be added on input inductance L in is Vin.
[t 2-t 3] stage: the first switching tube Q1 and second switch pipe Q2 turns off simultaneously, and the electric current on input inductance flows through the body diode of the first switching tube Q1, makes the first switching tube Q1 realize ZVS.
[t 3-t 4] stage: the first switching tube Q1 is open-minded, and inductive current also will decline, and is the high-frequency harmonic reduced in inductive current, and under system will be operated in discontinuous mode, the voltage at this moment on public capacitance is also by peak voltage when being greater than twice input voltage.
[t 4-t 5] stage: without any energy storage in input inductance, input inductive current is zero.
[t 5-t 6] stage: the first switching tube Q1 and second switch pipe Q2 turns off.Because the input resistance now on LLC is the inductance coil on LLC converter, the input current on LLC lags behind input voltage, and the body diode therefore in Q2 is re-filled electric current by the input current in LLC converter and reaches ZVS.
Be illustrated in figure 3 LLC resonant transformation stage equivalent circuit diagram, set up this equivalent model, be conducive to founding mathematical models, effective analytic transformation device characteristic, in LLC resonance DC-DC conversion stages, object finds out the relation of switching frequency and resonance conversion stages out-put supply.
More complicated is understood with transient analysis in the LLC converter stage, in a resonant circuit, resonance current is determined by given driving power and load, as shown in Figure 6, at LLC resonant stage, input voltage is square-wave voltage, when two rectifier diodes all reverse bias time, output voltage is diode voltage, and output voltage is at this moment continuous voltage, and circuit is open-circuit condition.
As shown in Figure 4, this stage is resonance DC-DC conversion stages, and now, the resonance frequency of controlled resonant converter is:
f r = 1 2 π L r C r
In this stage, controlled resonant converter is operated near resonance frequency or is less than resonance frequency, because under this operating frequency, switching tube can realize ZVS, rectifying tube can realize ZCS, no-voltage turns on and off and the loss of cut-offfing of switching tube is all reduced, thus plays the object improving integral transformation device efficiency.
[t 1-t 2] stage, the first switching tube Q1 conducting, resonance current i lrincrease, i lrbe greater than i lm, the first rectifier diode D1 conducting, transformer is output voltage clamping, and converter starts to secondary transferring energy, and because the first switching tube Q1 realizes ZVS, turn-off power loss is little, and the energy being transferred to secondary side will increase.
[t 2-t 3] stage, i lrequal i lm, L mstart to participate in resonance, the resonant cavity of resonant element composition is started working, and transformer is output isolation, and the first rectifier diode D1 turns off, and former secondary does not carry out the transmission of energy.
[t 3-t 4] stage, the first switching tube Q1 and second switch pipe Q2 turns off, and in Dead Time, the parasitic capacitance C1 electricity of the first switching tube Q1, the parasitic capacitance C2 electric discharge of second switch pipe Q2, makes second switch pipe Q2 to realize ZVS.
As shown in Figure 5, the basic thought of power factor correction technology principle is: AC-input voltage is after full-wave rectification, DC/DC conversion is carried out to the full-wave rectified voltage of gained, by suitably controlling to make input current average value automatically follow the voltage waveform after full-wave rectification, make input current sineization, keep output voltage stabilization simultaneously.Circuit of power factor correction generally has two feedback control loops: inner ring is electric current loop, makes the input current of DC/DC converter identical with full-wave rectified voltage waveform; Outer shroud is Voltage loop, makes the direct voltage of DC/DC converter stable output.
CCM control model is adopted on the whole to circuit of power factor correction, by sampling to output voltage and PFC output current, feed back to PWM, PWM is changed the operating frequency of circuit by the duty ratio of opening carrying out analyzing compared with control first switching tube Q1 and second switch pipe Q2 two switching tubes to electric current and voltage and then is reached the object of regulation and control.
And this kind of control method has the advantage that input and output current ripples is little, THD and EMI is little, break-over of device loss is little, Current Control under CCM pattern applies maximum control modes, and the Average Current Control under CCM pattern uses and AC-DC controlled resonant converter, the feature of Average Current Control is: THD and EMI is little, to insensitive for noise, switching frequency is fixed, inductive current
Error between peak value and mean value is little, can detect arbitrary topology in principle, the electric current on any road, is applicable to popular power occasion, is a kind of control mode that in circuit of power factor correction, Application comparison is many.
As shown in Figure 6, matlab software is utilized to carry out simulation analysis, suppose that the THD of the harmonic wave flowing into electrical network is 116.4%, the appearance of harmonic current and harmonic voltage, a kind of pollution to utility network, harmonic wave makes the element in utility network create additional harmonic loss, reduces generating, transmission of electricity and the efficiency of power consumption equipment; The normal work of the various electric equipment of harmonic effects; Harmonic wave can cause parallel resonance and the series resonance of local in utility network, thus makes Harmonics amplification; Harmonic wave can cause the misoperation of relaying protection and automatics, and it is inaccurate that electrical measuring instrument can be made to measure; Harmonic wave can produce interference to contiguous communication system, and the lighter produces noise, reduces communication quality; Severe one causes dwelling to be lost, and communication system cannot normally be worked.
As shown in Figure 7, suppose to use this kind of AC-DC circuit of power factor correction, THD can be made to be reduced to 27.64%, better than general AC-DC converter filter effect.
As shown in Figure 8, this invention new A C-DC controlled resonant converter efficiency is apparently higher than the efficiency of traditional power factor correction circuit, this is because use soft switch technique in this controlled resonant converter, what effectively reduce switching tube cut-offs loss, and this kind of LLC resonant topology plays good effect to electrical isolation, reduce EMI, noise decrease.
Above content is only and technological thought of the present invention is described; protection scope of the present invention can not be limited with this; every technological thought proposed according to the present invention, any change that technical scheme basis is done, within the protection range all falling into claims of the present invention.

Claims (5)

1. a single-stage AC-DC controlled resonant converter, is characterized in that: comprise the AC-DC change-over circuit of prime and the LLC resonant circuit of rear class; AC-DC change-over circuit comprises communication power supply (Vac), bridge rectifier, be used for the input inductance (Lin) of storage power, switching tube and public capacitance (Cb); The output of AC-DC change-over circuit connects LLC resonant circuit, LLC resonant circuit comprises the resonant tank being connected to winding side, transformer (T) former limit, and be connected to the current rectifying and wave filtering circuit of transformer (T) vice-side winding side, the output resistance (Ro) as whole circuit output end in parallel on the output of current rectifying and wave filtering circuit.
2. single-stage AC-DC controlled resonant converter according to claim 1, is characterized in that: the particular circuit configurations of described circuit of power factor correction is:
The output of communication power supply (Vac) is connected on the input of bridge rectifier, an output of bridge rectifier is connected to one end of input inductance (Lin), and another output is connected to the source electrode of second switch pipe (Q2); The source electrode of the first switching tube (Q1) and the drain electrode of second switch pipe (Q2) are all connected on the other end of input inductance (Lin); Public capacitance (Cb) is connected in parallel between the source electrode of second switch pipe (Q2) and drain electrode; The input of LLC resonant circuit is connected on the two ends of public capacitance (Cb).
3. single-stage AC-DC controlled resonant converter according to claim 1 and 2, is characterized in that: described resonant tank comprises resonant capacitance (Cr), resonant inductance (Lr) and magnetizing inductance (Lm); Resonant capacitance (Cr) is connected to one end of transformer (T) former limit winding after connecting with resonant inductance (Lr), the other end of transformer (T) former limit winding is connected with the output of circuit of power factor correction as the input of resonant tank with resonant capacitance (Cr); Magnetizing inductance (Lm) is connected in parallel on the two ends of transformer (T) former limit winding.
4. single-stage AC-DC controlled resonant converter according to claim 1 and 2, is characterized in that: described current rectifying and wave filtering circuit comprises two diodes and output filter capacitor (Co); The two ends of transformer (T) vice-side winding are connected with the anode of the first diode (D1) with the second diode (D2) respectively, and output filter capacitor (Co) is connected in parallel between the negative electrode of the first diode (D1) and the negative electrode of the second diode (D2); Output resistance (Ro) is connected in parallel on the two ends of output filter capacitor (Co) as output.
5. single-stage AC-DC controlled resonant converter according to claim 4, is characterized in that: described first diode (D1) and the second diode (D2) are rectifier diode.
CN201510182035.6A 2015-04-16 2015-04-16 Single-stage AC-DC resonant converter Pending CN104779820A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105356758A (en) * 2015-12-03 2016-02-24 东北电力大学 High frequency isolated DC-DC two stage power conversion system structure
CN111293874A (en) * 2020-03-25 2020-06-16 田建龙 Power factor correction system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201134750Y (en) * 2007-10-08 2008-10-15 薛晓明 Single-stage LLC series resonance AC/DC converter
CN101505107A (en) * 2009-01-20 2009-08-12 华南理工大学 Low voltage stress single-stage AC-DC converter based on LLC series resonance
CN101527520A (en) * 2009-01-20 2009-09-09 华南理工大学 Single-stage single-phase AC-DC convertor based on LLC series resonance
CN102130515A (en) * 2011-04-08 2011-07-20 东南大学 Non-contact electrical energy transmission device with self-adaptive power factor correction and control method
US20130320871A1 (en) * 2009-10-01 2013-12-05 Inventronics (Hangzhou),Inc. High efficiency constant current led driver

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201134750Y (en) * 2007-10-08 2008-10-15 薛晓明 Single-stage LLC series resonance AC/DC converter
CN101505107A (en) * 2009-01-20 2009-08-12 华南理工大学 Low voltage stress single-stage AC-DC converter based on LLC series resonance
CN101527520A (en) * 2009-01-20 2009-09-09 华南理工大学 Single-stage single-phase AC-DC convertor based on LLC series resonance
US20130320871A1 (en) * 2009-10-01 2013-12-05 Inventronics (Hangzhou),Inc. High efficiency constant current led driver
CN102130515A (en) * 2011-04-08 2011-07-20 东南大学 Non-contact electrical energy transmission device with self-adaptive power factor correction and control method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105356758A (en) * 2015-12-03 2016-02-24 东北电力大学 High frequency isolated DC-DC two stage power conversion system structure
CN111293874A (en) * 2020-03-25 2020-06-16 田建龙 Power factor correction system

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Application publication date: 20150715