CN106787756B - A kind of CL-FT-CL resonance DC converter - Google Patents

A kind of CL-FT-CL resonance DC converter Download PDF

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Publication number
CN106787756B
CN106787756B CN201611244896.3A CN201611244896A CN106787756B CN 106787756 B CN106787756 B CN 106787756B CN 201611244896 A CN201611244896 A CN 201611244896A CN 106787756 B CN106787756 B CN 106787756B
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high frequency
circuit
frequency transformer
type high
resonance
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CN106787756A (en
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杨良
王议锋
王成山
钟旭
韦徵
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Tianjin University
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Tianjin University
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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
    • H02M3/22—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
    • H02M3/33569—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 having several active switching elements
    • 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
    • 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 CL-FT-CL resonance DC converters, it is made of sequentially connected half-bridge inversion circuit, CL-FT-CL resonance circuit and diode rectifier circuit, converter is inputted by the half-bridge inversion circuit, is exported after CL-FT-CL resonance circuit effect from the diode rectifier circuit；The half-bridge inversion circuit is made of first switch tube and second switch, and the CL-FT-CL resonance circuit is made of first capacitor, the second capacitor, the first inductance, the second inductance, inverse-excitation type high frequency transformer and positive activation type high frequency transformer；The Same Name of Ends of the inverse-excitation type high frequency transformer is not in the same side, the Same Name of Ends of the positive activation type high frequency transformer is located at the same side, the inverse-excitation type high frequency transformer and positive activation type high frequency transformer can widen the power delivery capabilities of converter, the CL-FT-CL resonance circuit can realize the no-voltage of switching tube open, the zero-current switching of quasi- zero-current switching and diode, and widen the input voltage range and output voltage range of circuit.

Description

A kind of CL-FT-CL resonance DC converter
Technical field
The invention belongs to a kind of DC converter, especially a kind of efficient, wide input/output bound, high-power " capacitor Inductance-flyback transformer-capacitor and inductor (CL-FT-CL) " type resonance DC converter.
Background technique
Present distributed power generation is a kind of emerging energy utilization patterns, compared to traditional extensive centrality fossil energy Source generation mode, it has many advantages, such as that environment-friendly type is high, sustainability is strong, at low cost, installed capacity is flexibly adjustable, has obtained the country The extensive concern of outer scholar.DC converter, the important ring as power electronic equipment in distributed generation system play Important role has the multiple functions such as connection different brackets DC bus, control DC voltage, control battery charging and discharging and makees With becoming a research hotspot at present.
The problems such as to improve energy transfer efficiency, the heat ageing that reduction is generated by thermal losses, DC converter is to converter Conversion efficiency requirement it is higher and higher so that traditional Boost DC converter and Buck converter etc. cannot expire The increasing application of foot needs.Therefore, there is the high power DC converter close to 100% efficiency to become correlative study for research The most important thing.
Resonance DC converter introduces resonant element (capacity cell C, inductance component L) in the converter, utilizes its resonance Characteristic the device for power switching of converter is worked under soft switching conditions, greatly improve DC converter Conversion efficiency, therefore, it has become one of research directions of ideal DC converter.Traditional resonance DC converter includes string Join LC converter and parallel connection LC converter, both there is high efficiency, the characteristic of Sofe Switch, but the former has more difficult tune at light load There is the problems such as conversion efficiency reduces at light load in the problems such as saving output voltage, the latter, these problems make answering for two kinds of converters With being restricted.Further, the proposition of the converters such as LLC converter, CLL converter is so that the research of controlled resonant converter obtains Development.These converters are by introducing additional resonating device, so that converter keeps traditional series and parallel lc circuit advantage Meanwhile overcome traditional circuit there are the shortcomings that, have excellent transform effect.However, these converters still have Problems demand solves, and including that cannot realize the opening of power switch tube simultaneously, turn off Sofe Switch, efficiency is limited；Input, output electricity Narrow scope is pressed, is not suitable for needing to be adjusted flexibly the scene of voltage class；Only single power inverter considers magnetic element Saturation problem, converter transimission power are limited etc..In addition, there is also classes for the controlled resonant converters such as some CLCL, three-level LLC Like problem.
Summary of the invention
Purpose of the invention is to overcome the shortcomings in the prior art, further increases the transformation effect of controlled resonant converter Rate, using power, proposing a kind of has the double Sofe Switch of power switch tube on/off, wide input/output voltage range, height The isolated form CL-FT-CL resonance DC converter of power grade, high conversion efficiency.The converter is a kind of novel direct current change Converter circuit topology, the no-voltage that power switch tube may be implemented open (Zero voltage switching, ZVS), standard zero Zero electricity of switch off current (Quasi-Zero current switching, Quasi-ZCS) and rear class rectification circuit diode Stream shutdown (ZCS) has wider input, output voltage application range, while guaranteeing height of the converter in full power range The features such as efficiency.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of CL-FT-CL resonance DC converter, by sequentially connected half-bridge inversion circuit, CL-FT-CL resonance circuit It is formed with diode rectifier circuit, converter is inputted by the half-bridge inversion circuit, is acted on through the CL-FT-CL resonance circuit It is exported afterwards from the diode rectifier circuit；The half-bridge inversion circuit is made of first switch tube and second switch, described CL-FT-CL resonance circuit is by first capacitor, the second capacitor, the first inductance, the second inductance, inverse-excitation type high frequency transformer and normal shock Formula high frequency transformer composition, the diode rectifier circuit includes first diode, the second diode, third diode, the 4th Diode and third capacitor；The Same Name of Ends of the inverse-excitation type high frequency transformer is not in the same side, the positive activation type high frequency transformer Same Name of Ends be located at the same side, the power that the inverse-excitation type high frequency transformer and positive activation type high frequency transformer can widen converter passes Movement Capabilities, the CL-FT-CL resonance circuit can realize the no-voltage of switching tube open, quasi- zero-current switching and diode zero Switch off current, and widen the input voltage range and output voltage range of circuit.
In the CL-FT-CL resonance circuit, described first capacitor one end is connect with the midpoint of the half-bridge inversion circuit, The other end is successively connect with the primary side of first inductance and the inverse-excitation type high frequency transformer；The original of inverse-excitation type high frequency transformer Side one end and the first inductance connection, the other end respectively with second capacitor and second inductance connection；Inverse-excitation type high frequency becomes Secondary side one end of depressor is connect with a midpoint of the diode rectifier circuit, the other end and the positive activation type high frequency transformer Secondary side one end connection；Second capacitor one end respectively with the primary side of inverse-excitation type high frequency transformer and the second inductance connection, the other end It is connect respectively with the primary side of the source electrode of the second switch, positive activation type high frequency transformer；Second inductance one end respectively with flyback The primary side of formula high frequency transformer and the second capacitance connection, the other end are connect with the primary side of positive activation type high frequency transformer；Positive activation type is high Primary side one end of frequency power transformer and the second inductance connection, the other end are connect with the source electrode of the second capacitor and second switch respectively； The secondary side of inverse-excitation type high frequency transformer and positive activation type high frequency transformer is coupled in series, and changes the resonant network of circuit, The resonance frequency for having changed simultaneously circuit has widened the input voltage range and output voltage range of circuit.
Electric current by first capacitor, the electric current by the second capacitor and pass through second in the CL-FT-CL resonance circuit The electric current of inductance keeps same-phase or phase difference 180 degree near resonance point.
The input voltage range is 350V~600V；Output voltage range is 10V~52V.
Compared with prior art, the beneficial effects brought by the technical solution of the present invention are as follows:
1. the no-voltage that switching tube may be implemented in converter of the present invention is opened, quasi- zero-current switching Sofe Switch and diode Zero-current switching Sofe Switch, improve the working efficiency of converter.
2. converter of the present invention there can be wider voltage regulation limits near the second resonance point, may be implemented to defeated The quick of voltage, wide scope are adjusted out.
3. there are two transformers for converter tool of the present invention, inverter power application range can be widened.
4. the main electrical current of CL-FT-CL resonance circuit keeps approximate same-phase near resonance point in converter of the present invention Or phase difference 180 degree, and ideal sine wave shape is presented, the efficiency of system not only can be improved, while but also adopting It is more accurate with equivalent fundamental wave method analysis circuit, facilitate the parameter designing of circuit.
5. working frequency can be improved by reasonable parameter designing in converter of the present invention, the power for improving converter is close Degree.
Detailed description of the invention
Fig. 1 is the topological structure schematic diagram of converter of the present invention；
Fig. 2 is the voltage gain curve of converter of the present invention；
Fig. 3-1 to Fig. 3-4 is respectively the equivalent circuit diagram of the converter course of work of the present invention；
Fig. 4 is the key operation waveforms figure of converter of the present invention；
Fig. 5 is the simulation waveform of converter of the present invention.
Specific embodiment
The invention will be further described with reference to the accompanying drawing:
A kind of CL-FT-CL resonance DC converter, by sequentially connected half-bridge inversion circuit, CL-FT-CL (capacitor electricity Sense-flyback transformer-capacitor and inductor) resonance circuit and diode rectifier circuit composition, converter is by the half-bridge inversion circuit Input exports after the effect of CL-FT-CL resonance circuit from the diode rectifier circuit；In the present embodiment, half-bridge inversion circuit By first switch tube S1With second switch S2Composition, CL-FT-CL resonance circuit is by first capacitor C1, the second capacitor C2, first Inductance L1, the second inductance L2, inverse-excitation type high frequency transformer T1With positive activation type high frequency transformer T2Composition, diode rectifier circuit by First diode D1, the second diode D2, third diode D3, the 4th diode D4With third capacitor CoComposition, RoFor load electricity Resistance.
As shown in Figure 1, in the CL-FT-CL resonance circuit, first capacitor C1The midpoint of one end and half-bridge inversion circuit Connection, the other end and the first inductance L1Connection；First inductance L1With first capacitor C1Connection, the other end and inverse-excitation type high frequency transformation Device T1Primary side connection；Inverse-excitation type high frequency transformer T1Primary side one end and the first inductance L1Connection, the primary side other end and the second electricity Hold C2, the second inductance L2One midpoint of connection, secondary side one end and diode rectifier bridge connects, and the other end and positive activation type high frequency become Depressor T2Secondary side one end connection；Second capacitor C2One end and inverse-excitation type high frequency transformer T1Primary side, the second inductance L2Connection, separately One end and second switch S2Source electrode, positive activation type high frequency transformer T2Primary side connection；Second inductance L2One end and inverse-excitation type high frequency Transformer T1Primary side, the second capacitor C2Connection, the other end and positive activation type high frequency transformer T2Primary side connection；Positive activation type high frequency transformation Device T2Primary side one end and the second inductance L2Connection, the other end and the second capacitor C2, second switch S2Source electrode connection.Two changes The secondary side of depressor is coupled in series, and changes the resonant network of circuit, has changed simultaneously the resonance frequency of circuit, Ke Yiyou Effect widens the power delivery capabilities of converter, by rationally designing transducer parameters, i.e. change T1、T2Magnetizing inductance Lm1、Lm2 With around turn(s) ratio n1、n2, L1、L2Inductance, C1、C2Capacitor can effectively realize the no-voltage of switching tube open, switching tube The zero-current switching of diode in quasi- zero-current switching and diode rectifier circuit, while can guarantee that circuit has wide input defeated Voltage range out can have 350V~600V input voltage range, the output voltage range of 10V~52V.Wherein VinIndication circuit DC input voitage, Lm1、Lm2Respectively indicate inverse-excitation type high frequency transformer T1With positive activation type high frequency transformer T2Equivalent excitation Inductance.
There are two resonance frequencies for CL-FT-CL resonance DC converter tool, can be divided into first according to the size relation of frequency Resonance frequency fr1With the second resonance frequency fr2, wherein fr1Less than fr2.The voltage of resonant type soft-switch converter increases in the present embodiment Beneficial curve as shown in Fig. 2, converter in the second resonance point fr2Nearby obtain voltage gain MvMaximum value, MvWith switching frequency fsContinue rise rapid decline.Therefore the converter can be defeated to converter by adjusting the switching frequency realization of control signal The quick adjusting of voltage out has in wider adjustable extent, such as gain curve shown in Fig. 2, when load is specified item When under part, when switching frequency is to higher than resonance frequency fr2Direction raise 20kHz when, Mv will quickly drop to from 1.3 times 0.2 or so, the ability with fasting conditions output voltage.The CL-FT-CL resonant type soft-switch converter is in the second resonance frequency fr2Power switch tube ZVS nearby may be implemented and open Sofe Switch and Quasi-ZCS shutdown Sofe Switch and two pole of rectification circuit The ZCS soft switching of pipe.
Main electrical current (the i.e. first capacitor C of resonance circuit part in the present embodiment converter1Electric current i1, the second capacitor C2Electricity Flow iC2With the second inductance L2Electric current i2) approximate same-phase or phase difference 180 degree are kept near resonance point, and present preferably just String waveform shape, not only can improve the efficiency of system, while but also more accurate using equivalent fundamental wave method analysis circuit, Facilitate the parameter designing of circuit.
The work equivalent circuit of resonance DC converter and primary waves are shaped like Fig. 3-1 to Fig. 3-4 and Fig. 4 institute in the present embodiment Show, t0To t4Waveform diagram for converter half of duty cycle, it is full symmetric with the operating condition of other half period, it repeats no more: t0、t1、t2、t3、t4At the time of respectively indicating between each mode, PWM1, PWM2 are respectively first switch tube S1, second switch S2 PWM drive signal.
1 [t of mode0, t1]: this mode equivalent circuit is as shown in figure 3-1.This mode is the dead track for controlling signal.In t0When It carves, second switch S2Shutdown, while first switch tube S1Open signal do not arrive also, S1It is held off.Flow through first capacitor C1Electric current be denoted as i1, i at this time1Pass through first switch tube S1Parasitic diode and parasitic inductance reverse circulated, first switch tube S1Both end voltage remain zero.Second capacitor C2Electric current iC2Reverse circulated.Flow through the second inductance L2Electric current iL2Reverse flow It is logical.Transformer T1、T2Secondary current amplitude, direction are identical, are denoted as iS, reverse circulated.Diode D2、D3Conducting, circuit is to load RoPower supply.In t1Moment, first switch tube S1Conducting, at this time due to the first S1Both end voltage remains zero, and no-voltage opens soft open Pass is achieved；I simultaneously1、iC2It is zero.
2 [t of mode1, t2]: this mode equivalent circuit is as shown in figure 3-2.In this mode, i1、iC2Start from scratch rising, remaining Variable keeps former direction constant, participates in circuit resonance.To t2Moment, iSZero is dropped to, that is, flows through diode D2、D3Electric current from Zero is so dropped to, diode realizes zero-current switching Sofe Switch, this mode terminates.
3 [t of mode2, t3]: this mode equivalent circuit is as shown in Fig. 3-3.In this mode, iSStart from scratch rising, forward stream Logical, remaining variables keep former direction constant, continue to participate in circuit resonance.Diode D1、D4Forward conduction.To t3Moment flows through Two inductance L2Electric current i2Zero is risen to, this mode terminates.
4 [t of mode3, t4]: this mode equivalent circuit is as shown in Figure 3-4.In this mode, i2Start from scratch rising, remaining change Amount keeps former direction constant, continues to participate in circuit resonance.To t4Moment, first switch tube S1Shutdown, then flows through the electricity of switching tube Flow direction and size and i1It is identical, i1It is in close proximity to 0, therefore first switch tube S1It is soft that quasi- zero-current switching may be implemented Switch.
So far, work of the CL-FT-CL resonance DC converter circuit in half period terminates, into another half period Work.
Fig. 5 is the simulation waveform of the present embodiment CL-FT-CL resonance DC converter, it can be seen from the figure that first switch Pipe S1No-voltage may be implemented and open Sofe Switch and quasi- zero-current switching Sofe Switch, diode current drops to zero naturally, two poles Pipe realizes zero-current switching Sofe Switch.Therefore, CL-FT-CL resonance DC converter conversion efficiency with higher.
The present invention is not limited to embodiments described above.Above the description of specific embodiment is intended to describe and say Bright technical solution of the present invention, the above mentioned embodiment is only schematical, is not restrictive.This is not being departed from In the case of invention objective and scope of the claimed protection, those skilled in the art may be used also under the inspiration of the present invention The specific transformation of many forms is made, within these are all belonged to the scope of protection of the present invention.

Claims (3)

1. a kind of CL-FT-CL resonance DC converter, which is characterized in that by sequentially connected half-bridge inversion circuit, CL-FT-CL Resonance circuit and diode rectifier circuit composition, converter is inputted by the half-bridge inversion circuit, through the CL-FT-CL resonance It is exported after circuit function from the diode rectifier circuit；The half-bridge inversion circuit is by first switch tube (S1) and second switch (S2) composition is managed, the CL-FT-CL resonance circuit is by first capacitor (C1), the second capacitor (C2), the first inductance (L1), second Inductance (L2), inverse-excitation type high frequency transformer (T1) and positive activation type high frequency transformer (T2) composition, the diode rectifier circuit packet Include first diode (D1), the second diode (D2), third diode (D3), the 4th diode (D4) and third capacitor (Co)； The Same Name of Ends of the inverse-excitation type high frequency transformer (T1) is not in the same side, the Same Name of Ends position of the positive activation type high frequency transformer (T2) In the same side, the inverse-excitation type high frequency transformer (T1) and positive activation type high frequency transformer (T2) can widen the power transmission of converter Ability, the CL-FT-CL resonance circuit can realize the no-voltage of switching tube open, zero electricity of quasi- zero-current switching and diode Stream shutdown, and widen the input voltage range and output voltage range of circuit；
In the CL-FT-CL resonance circuit, described first capacitor one end (C1) is connect with the midpoint of the half-bridge inversion circuit, The other end is successively connect with primary side one end of one end of first inductance (L1) and the inverse-excitation type high frequency transformer (T1)；Instead Swash formula high frequency transformer (T1) primary side one end connect with the first inductance (L1) other end, the other end respectively with second capacitor (C2) one end is connected with described second inductance (L2) one end；Secondary side one end of inverse-excitation type high frequency transformer (T1) and the diode The first diode anode of rectification circuit is connected with third diode cathode, the other end and the positive activation type high frequency transformer (T2) Secondary side one end connection；The one end second capacitor (C2) is electric with the primary side other end of inverse-excitation type high frequency transformer (T1) and second respectively Feel the one end (L2) connection, the other end original with the source electrode of the second switch (S2), positive activation type high frequency transformer (T2) respectively The connection of the side other end；The one end second inductance (L2) respectively with the primary side other end and the second capacitor of inverse-excitation type high frequency transformer (T1) (C2) one end connects, and the other end is connect with primary side one end of positive activation type high frequency transformer (T2)；Positive activation type high frequency transformer (T2) Primary side one end connect with the second inductance (L2) other end, the other end respectively with the second capacitor (C2) other end and second switch (S2) source electrode connection；The secondary side of inverse-excitation type high frequency transformer (T1) and positive activation type high frequency transformer (T2) is connected with cascade It connects, changes the resonant network of circuit, and change the resonance frequency of circuit, widened the input voltage range and output of circuit Voltage range.
2. a kind of CL-FT-CL resonance DC converter according to claim 1, which is characterized in that the CL-FT-CL resonance The electric current, the electric current by the second capacitor (C2) and the electric current by the second inductance (L2) for passing through first capacitor (C1) in circuit exist Resonance point nearby keeps same-phase or phase difference 180 degree.
3. a kind of CL-FT-CL resonance DC converter according to claim 1, which is characterized in that the input voltage range For 350V~600V；Output voltage range is 10V~52V.
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CN113224945A (en) * 2021-04-29 2021-08-06 北京机械设备研究所 Topological structure of DC/DC power converter cascaded by Buck + CLCL resonant converters
CN114285285A (en) * 2021-05-10 2022-04-05 华北电力大学（保定） Novel wide-voltage gain direct-current transformer based on T-shaped bridge and double transformers
CN117200587B (en) * 2023-11-08 2024-02-02 中山市宝利金电子有限公司 Low-power-loss charging pile circuit based on direct power transmission and charging pile

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