CN116633160B - Single-stage isolated bidirectional/unidirectional DC-DC converter and control method - Google Patents

Single-stage isolated bidirectional/unidirectional DC-DC converter and control method Download PDF

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Publication number
CN116633160B
CN116633160B CN202310919862.3A CN202310919862A CN116633160B CN 116633160 B CN116633160 B CN 116633160B CN 202310919862 A CN202310919862 A CN 202310919862A CN 116633160 B CN116633160 B CN 116633160B
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bridge
circuit
switch tube
controllable switch
rectifying
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CN116633160A (en
Inventor
陈乾宏
许叶葳
周思慧
任小永
张之梁
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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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
    • H02M3/33576—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 having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters
    • 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
    • H02M7/219—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 in a bridge configuration
    • 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
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac 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
    • H02M7/537—Conversion of dc power input into ac 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, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a single-stage isolated bidirectional/unidirectional DC-DC converter and a control method thereof, wherein the converter can realize unidirectional or bidirectional circulation of energy and meet the application requirement of a wireless electric energy transmission system on interoperability. The converter includes: the transformer comprises an inverter circuit, a primary side passive network, a primary side winding of a transformer, a secondary side winding of the transformer, a secondary side passive network, a rectifying circuit and a load. When the converter is used for bidirectional power transmission, the inverter circuit comprises an inverter bridge type structure unit and an inverter structure switching unit; the rectifying circuit comprises a rectifying bridge type structure unit and a rectifying structure switching unit. The device and the control method can meet the interoperability requirement of the wireless power transmission system on multi-gear power levels and multi-gear transmission distances by only matching a single-stage DC-DC structure with a front-stage PFC through the structure switching of the inverter circuit and the rectifying circuit, and compared with the existing double-stage isolation type DC-DC converter, the device and the control method effectively reduce the system volume and the cost and improve the system efficiency.

Description

Single-stage isolated bidirectional/unidirectional DC-DC converter and control method
Technical Field
The invention relates to a single-stage isolated bidirectional/unidirectional DC-DC converter and a control method thereof, belonging to the field of wireless power transmission.
Background
The wireless power transmission technology (Wireless Power Transfer, WPT for short) greatly increases the safety, convenience and reliability of the charging system due to the non-contact characteristic between the power transmitting end and the power receiving end, and has higher practical value and potential economic benefit in the fields of biomedicine, foreign matter detection, underwater power supply, electric automobile charging and the like.
The wireless charging system of the electric automobile is very suitable for realizing bidirectional electric energy transmission due to the characteristic that a transmitting end and a receiving end are not contacted, and is better involved in dispatching of a power grid, so that fusion with a distributed micro-power grid is realized. In practical applications, the wireless power transmission system often needs to meet different output power requirements. The wireless charging and calibrating method of the electric vehicle wireless charging international standard SAE J2954 light plug-in type/pure electric vehicle divides a light-weight wireless charger of the electric vehicle into 3 types according to transmission power class, namely WPT1 (3.7 kW), WPT2 (7.7 kW) and WPT3 (11 kW), and provides that the system efficiency is not lower than 85%, and the charging transmission distance standard is consistent with the domestic standard. In the electric automobile industry, the national wireless charging standard of the Chinese electric automobile carries out multistage classification on power grades from 3.7kW to 11kW, and meanwhile, three classes of grades, namely Z1 (100 mm-150 mm), Z2 (140 mm-210 mm) and Z3 (170 mm-250 mm), are carried out according to the automobile type. Therefore, how to design the converter, ensure stable and efficient energy transmission in a wide coupling range and a wide load range, and meet the related standards of the existing industry, is a key ring in the design of the wireless charging system of the electric automobile.
In order to achieve the wide gain output characteristic of the converter, the domestic common technical scheme is that high-efficiency constant-current constant-voltage charging is achieved by combining receiving end controllable rectification with regulation and control of a transmitting end Buck converter, a conventional wireless power transmission system is structured as shown in a figure 1, a conventional power transmission system adopts a two-stage isolation type DC-DC converter, the system comprises a PFC module, a BUCK module, an inverter circuit unit, a primary passive network, a transformer primary winding, a transformer secondary winding, a secondary passive network, a rectifying circuit and a load, wherein the PFC module, the Buck module, the inverter circuit, the primary passive network, the transformer primary winding, the transformer secondary winding, the secondary passive network, the rectifying circuit and the load are sequentially connected. Reverse-transformation circuit route controllable switch tubeS p1 、S p2 、S p3 And (3) withS p4 The first voltage stabilizing capacitor C1; rectifying circuit route controllable switch tubeS s1 、S s2 、S s3 、S s4 And voltage stabilizing capacitor C 2 Composition is prepared. Inverter bridge of inverter circuitThe bridge arm midpoint is connected with the primary side passive network, and the bridge arm midpoint of the rectifying bridge of the rectifying circuit is connected with the secondary side passive network. The scheme is simpler in implementation, and can be well compatible with battery voltage and transformer parameter changes, but the one-stage Buck converter with the two-stage structure in the system increases the cost and the volume of the system, and the overall efficiency of the system is lower. Therefore, how to realize stable output of the wireless power transmission system under a wide range of working conditions, and simultaneously, the system efficiency can be further optimized, the product cost and the product volume can be reduced, and the problem to be solved in the existing scheme is urgent.
Disclosure of Invention
In order to solve the problems in the prior system scheme, the invention provides a single-stage isolation type/unidirectional DC-DC converter, which can be compatible with the requirements of three power levels of 11kW, 7.7kW and 3.7kW through the structural switching of an inverter circuit, does not need to add an additional DC-DC converter, can reduce the volume of the converter and optimize the system efficiency.
It is another object of the present invention to provide a control method suitable for use in the above converter.
The technical scheme of the invention is as follows:
the single-stage isolated bidirectional DC-DC converter at least comprises an inverter circuit, a primary passive network, a transformer primary winding, a transformer secondary winding, a secondary passive network, a rectifier circuit and a load, wherein the inverter circuit, the primary passive network, the transformer primary winding, the transformer secondary winding, the secondary passive network, the rectifier circuit and the load are sequentially connected, the inverter circuit and the rectifier circuit comprise a controllable switch tube and a voltage stabilizing capacitor, and the inverter circuit comprises an inverter bridge type structure unit and an inverter structure switching unit; the inversion bridge type structure unit comprises an inversion bridge and two voltage stabilizing capacitors, wherein the two voltage stabilizing capacitors are respectively connected in parallel at two ends of two bridge arms of the inversion bridge; the inversion structure switching unit comprises four controllable switching tubes, wherein two controllable switching tubes are respectively connected in series with positive poles of two input sides of the inversion circuit, and the other two switching tubes are connected in reverse series between drains of upper tubes of two bridge arms of the inversion bridge; the rectification circuit comprises a rectification bridge type structure unit and a rectification structure switching unit, wherein the rectification bridge type structure unit comprises a rectification bridge and two voltage stabilizing capacitors, and the two voltage stabilizing capacitors are respectively connected in parallel at two ends of two bridge arms of the rectification bridge; the rectification structure switching unit comprises two controllable switching tubes which are reversely connected in series between drains of upper tubes of two bridge arms of the rectification bridge.
The invention is further designed in that the inverter bridge structure unit in the inverter circuit comprises a controllable switch tubeS p1 、S p2 、S p3 、S p4 First voltage stabilizing capacitor C 1 A second voltage stabilizing capacitor C 2 Wherein the first voltage stabilizing capacitor C 1 Is connected in parallel with a controllable switch tubeS p1 AndS p2 Two ends of the bridge arm formed by the two voltage stabilizing capacitors C 2 Is connected in parallel with a controllable switch tubeS p3 AndS p4 Two ends of the bridge arm are formed; the inversion structure switching unit comprises a controllable switch tubeS p5 、S p6 、S p7 And (3) withS p8 Wherein the switching tube is controllableS p5 And (3) withS p6 Are connected in reverse and connected in series with a controllable switch tubeS p1 AndS p4 Between the drains of (2) a controllable switching tubeS p7 The source electrode of the (E) is connected with the anode of the low-voltage side input, the drain electrode is connected with the controllable switch tubeS p5 Is a source of (a)S p1 Is connected with the drain electrode of the controllable switch tubeS p8 The drain electrode of (C) is connected with the positive electrode of the high-voltage side input, and the source electrode is connected with a controllable switch tubeS p5 AndS p6 Is connected with the drain electrode of the transistor;
the rectifying bridge type structure unit in the rectifying circuit comprises a controllable switch tubeS s1 、S s2 、S s3 、S s4 Third voltage stabilizing capacitor C 3 Fourth voltage stabilizing capacitor C 4 Wherein the third stabilizing capacitor C 3 Is connected in parallel with a controllable switch tubeS s1 And (3) withS s2 Two ends of the bridge arm and a fourth voltage stabilizing capacitor C 4 Is connected in parallel with a controllable switch tubeS s3 And (3) withS s4 Two ends of the bridge arm are formed; the rectification structure is switched and is singlyThe element comprises a controllable switch tubeS s5 And (3) withS s6 Wherein the switching tube is controllable S s5 And (3) withS s6 Reverse connection is connected in series with the controllable switch tubeS p1 AndS p4 Is provided between the drains of the transistors.
The primary side passive network and the secondary side passive network adopt serial-serial type, serial-parallel type, parallel-serial type, LCL type or LCC type compensation networks respectively.
The control method of the single-stage isolated bidirectional DC-DC converter comprises the following steps:
1) The converter includes the following modes of operation when operating in an energy forward flow state:
first operation mode: controllable switch tube of inversion structure switching unitS p5 、S p6 And (3) withS p7 Conducting, wherein the inverter circuit works in a low-voltage input bridge type inverter structure; controllable switch tube of rectifying structure switching unit of rectifying circuitS s5 And (3) withS s6 The conduction and rectification circuit works in a bridge rectification structure;
second mode of operation: controllable switch tube of inversion structure switching unitS p5 、S p6 And (3) withS p8 Conducting, wherein the inverter circuit works in a high-voltage input bridge type inverter structure; controllable switch tube of rectifying structure switching unit of rectifying circuitS s5 And (3) withS s6 The conduction and rectification circuit works in a bridge rectification structure;
third mode of operation: controllable switch tube of inversion structure switching unitS p5 And (3) withS p6 The switch-off is performed and the switch-off is performed,S p7 conducting; the inverter circuit works in a step-down type structure; controllable switch tube of rectifying structure switching unit of rectifying circuit S s5 And (3) withS s6 The conduction and rectification circuit works in a bridge rectification structure;
2) When the converter works in the energy reverse circulation state, the controllable switch tube of the inversion structure switching unitS p5 And (3) withS p6 Conduction and control controllable switch tubeS p7 And (3) withS p8 The on-off of the inverter circuit selects an energy circulation loop, and the inverter circuit works in a bridge type rectifying structure; the rectification structure switching unit is used for realizing reverse power transmission of the converter and comprises the following working modes:
fourth mode of operation: controllable switch tube of rectifying structure switching unitS s5 And (3) withS s6 Conducting and rectifying circuit works in bridge type inversion structure;
fifth mode of operation: controllable switch tube of rectifying structure switching unitS s5 And (3) withS s6 The rectifier circuit is operated in a buck configuration.
The present invention is further directed to a fifth mode of operation in which the rectifier circuit operates in a buck configuration comprising:
first modality: controllable switch tube of rectifying bridge type structural unitS s1 And (3) withS s4 Input voltage of conducting and rectifying circuitV ab Is that, wherein V 2 For the output voltage of the rectifying circuit,V C3 is a third voltage stabilizing capacitor C 3 Applying a voltage;
second modality: controllable switch tube of rectifying bridge type structural unitS s1 And (3) withS s3 Input voltage of conducting and rectifying circuitV ab Is that；
Third modality: controllable switch tube of rectifying bridge type structural unit S s2 And (3) withS s3 Conducting, and outputting a short circuit by the rectifying circuit;
fourth modality: controllable switch tube of rectifying bridge type structural unitS s1 And (3) withS s4 Input voltage of conducting and rectifying circuitV ab Is that；
Fifth modality: the bridge arm of the rectifying bridge type structure unit has dead time in the on and off processes of the controllable switch tube, and the rectifying circuit forms a dead zone loop through the body diode of the controllable switch tube in the dead time.
The invention is further designed in that the inverter circuit in the third operation mode operates in a step-down configuration comprising:
modality a: controllable switch tube of inversion bridge type structure unitS p1 And (3) withS p4 Conduction and inverter circuit output voltageV AB Is that, wherein V 1 For the low-side input voltage of the inverter circuit,V C2 is a second voltage stabilizing capacitor C 2 Applying a voltage;
modality b: controllable switch tube of inversion bridge type structure unitS p2 And (3) withS p4 Conduction and inverter circuit output voltageV AB Is that；
Modality c: controllable switch tube of inversion bridge type structure unitS p2 And (3) withS p3 Conducting, and outputting a short circuit by the inverter circuit;
modality d: controllable switch tube of inversion bridge type structure unitS p1 And (3) withS p3 Conduction and inverter circuit output voltageV AB Is that；
Modality e: the bridge arm of the inversion bridge structure unit has dead time in the on and off processes of the controllable switch tube, and the inversion circuit forms a dead zone loop through the body diode of the controllable switch tube in the dead time.
The single-stage isolated unidirectional DC-DC converter at least comprises an inverter circuit, a primary passive network, a primary winding of a transformer, a secondary winding of the transformer, a secondary passive network, a rectifying circuit and a load, wherein the inverter circuit, the primary passive network, the primary winding of the transformer, the secondary passive network, the rectifying circuit and the load are sequentially connected, the inverter circuit and the rectifying circuit comprise a controllable switch tube and a voltage stabilizing capacitor, and the inverter circuit comprises an inverter bridge type structure unit and an inverter structure switching unit; the inversion bridge type structure unit comprises an inversion bridge and two voltage stabilizing capacitors, wherein the two voltage stabilizing capacitors are respectively connected in parallel at two ends of two bridge arms of the inversion bridge; the inversion structure switching unit comprises two controllable switching tubes and two diodes, wherein the two diodes are respectively connected in series with the anodes of the two input sides of the inversion circuit, and the two controllable switching tubes are reversely connected in series between the drains of the upper tubes of the two bridge arms of the inversion bridge.
The inversion bridge type structure unit in the inversion circuit comprises a controllable switch tubeS p1 、S p2 、S p3 、S p4 First voltage stabilizing capacitor C 1 A second voltage stabilizing capacitor C 2 Wherein the first voltage stabilizing capacitor C 1 Is connected in parallel with a controllable switch tubeS p1 AndS p2 Two ends of the bridge arm formed by the two voltage stabilizing capacitors C 2 Is connected in parallel with a controllable switch tubeS p3 AndS p4 Two ends of the bridge arm are formed; the inversion structure switching unit comprises a controllable switch tubeS p5 、S p6 Diode D 1 、D 2 Wherein the switching tube is controllableS p5 And (3) withS p6 Are connected in reverse and connected in series with a controllable switch tubeS p1 AndS p4 Between the drains of (a) diode D 1 The anode of the (C) is connected with the anode of the low-voltage side input, and the cathode is connected with a controllable switch tubeS p5 Is a source of (a)S p1 Is connected with the drain electrode of diode D 2 The anode of the (C) is connected with the anode of the high-voltage side input, and the cathode is connected with a controllable switch tubeS p5 AndS p6 Is connected to the drain of the transistor.
The invention is further designed in that the rectifying circuit comprises a controllable switch tubeS s1 、S s2 、S s3 、S s4 And voltage stabilizing capacitor C 4 Wherein the fourth voltage stabilizing capacitor C 4 Is connected in parallel with a controllable switch tubeS s3 AndS s4 Composition of the compositionThe rectifier circuit works in a bridge structure at the two ends of the bridge arm; wherein the controllable switch tubeS s1 、S s2 Replaceable diode D 3 、D 4 。
The control method of the single-stage isolated unidirectional DC-DC converter comprises the following working modes when the converter works in an energy forward circulation state:
operation mode a: controllable switch tube of inversion structure switching unitS p5 、S p6 And (3) withS p7 Conducting, wherein the inverter circuit works in a low-voltage input bridge type inverter structure; the rectifying circuit works in a bridge rectifying structure;
operation mode b: controllable switch tube of inversion structure switching unit S p5 、S p6 And (3) withS p8 Conducting, wherein the inverter circuit works in a high-voltage input bridge type inverter structure; the rectifying circuit works in a bridge rectifying structure;
operation mode c: controllable switch tube of inversion structure switching unitS p5 And (3) withS p6 The switch-off is performed and the switch-off is performed,S p7 conducting; the inverter circuit works in a step-down type structure; the rectifying circuit operates in a bridge rectifying configuration.
The invention is further designed in that the inverter circuit in the working mode c works in a step-down structure, comprising:
modality a: controllable switch tube of inversion bridge type structure unitS p1 And (3) withS p4 Conduction and inverter circuit output voltageV AB Is that；
Modality b: controllable switch tube of inversion bridge type structure unitS p2 And (3) withS p4 Conduction and inverter circuit output voltageV AB Is that；
Modality c: controllable switch tube of inversion bridge type structure unitS p2 And (3) withS p3 Conduction and reverseThe output of the variable circuit is short-circuited;
modality d: controllable switch tube of inversion bridge type structure unitS p1 And (3) withS p3 Conduction and inverter circuit output voltageV AB Is that；
Modality e: the bridge arm of the inversion bridge structure unit has dead time in the on and off processes of the controllable switch tube, and the inversion circuit forms a dead zone loop through the body diode of the controllable switch tube in the dead time.
The device and the control method of the invention combine the small-range regulation and control capability of PFC bus voltage through the structure switching of the inverter circuit and the rectifier circuit, make up the problem of insufficient large-range regulation and control capability of power under the condition of not adding a DC-DC unit additionally in the prior art, fully utilize the potential regulation and control capability of the resonant converter, improve the wide gain output capability of the converter, optimize the system efficiency, realize unidirectional or bidirectional circulation of energy and meet the application requirement of the wireless electric energy transmission system on interoperability.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can meet the interoperability requirement of the wireless power transmission system on multi-gear power levels and multi-gear transmission distances by only matching the single-stage DC-DC structure with the front-stage PFC, and compared with the existing double-stage isolation type DC-DC converter, the invention effectively reduces the system volume and cost and improves the system efficiency.
2. The invention relates to a single-stage isolated bidirectional/unidirectional DC-DC converter, which is characterized in that when bidirectional power is transmitted, the structures of an inverter circuit and a rectifying circuit are respectively switched, a second voltage stabilizing capacitor is added in the inverter circuit to store energy, and a fourth voltage stabilizing capacitor is added in the rectifying circuit. The inverter circuit transmits energy to the secondary side through the primary side passive network and the primary side winding of the transformer, and stores part of the energy in the second voltage stabilizing capacitor C 2 A voltage source capable of freely regulating and controlling the size is constructed, the regulation of the output voltage of the inverter circuit is realized, and the output of the converter is regulatedGain, optimizing system efficiency.
3. The single-stage isolated bidirectional/unidirectional DC-DC converter is characterized in that when unidirectional power is transmitted, the inverter circuit is provided with the structure switching unit, and the second voltage stabilizing capacitor is added in the inverter circuit to store energy, so that single/double-way input compatibility can be realized, and under the condition that the rated power cannot be achieved by a system due to overlarge transmission distance, the input voltage level of the inverter circuit is improved, the output capacity of the converter is regulated, and the interoperability of the system is further improved.
4. The converter is applied to a wireless power transmission system, can be compatible with the requirements of three power levels of 11kW, 7.7kW and 3.7kW through structure switching, does not need to add an additional DC-DC converter, can reduce the system volume, further optimizes the system efficiency, and can realize unidirectional or bidirectional transmission control of energy by combining the characteristics of a bridge structure.
5. In order to realize bidirectional power transmission, the converter is provided with the structure switching unit in the rectifying circuit and is added with the voltage stabilizing capacitor, and the bidirectional power transmission is realized by matching with the structure switching unit in the converter.
Drawings
FIG. 1 is a schematic diagram of a system architecture based on a combination of a receiver-side controllable rectification and a transmitter-side Buck converter;
fig. 2 is a schematic diagram of a wireless power transmission system based on the converter according to the present invention;
FIG. 3 is a schematic diagram of a preferred implementation of a single stage isolated bi-directional DC-DC converter of the present invention;
fig. 4 is a schematic circuit diagram of an LCC compensation network used for the primary and secondary passive networks in the first embodiment;
FIG. 5 is a schematic diagram of a converter circuit to which the control method of the second embodiment is applied;
FIG. 6 is a circuit schematic diagram of the inverter circuit in the first operating mode when operating in the low side input mode;
Fig. 7 is a circuit schematic diagram of the inverter circuit in the second operation mode when operating in the high-side input mode;
FIG. 8 is a schematic circuit diagram illustrating an inverter circuit operating in a first mode of operation with a low side input bridge inverter;
FIG. 9 is a schematic circuit diagram of a second mode of operation in which the inverter circuit is operated in the low side input bridge inverter in the first mode of operation;
FIG. 10 is a circuit diagram illustrating a third mode of operation of the inverter circuit in the low side input bridge inverter in the first mode of operation;
FIG. 11 is a schematic circuit diagram illustrating an inverter circuit operating in a second mode of operation in one of the high side input bridge inverter modes;
FIG. 12 is a schematic circuit diagram of a second mode of operation in which the inverter circuit is operated in the high side input bridge inverter in the second mode of operation;
FIG. 13 is a schematic circuit diagram illustrating a third mode of operation of the inverter circuit in the second mode of operation in the high side input bridge inverter;
fig. 14 is a schematic circuit diagram of a mode a when the inverter circuit is operated in the step-down configuration in the third operation mode;
fig. 15 is a schematic circuit diagram of a mode b when the two inverter circuits operate in a step-down configuration in the third operation mode;
fig. 16 is a schematic circuit diagram of a mode c of the second inverter circuit in the third operation mode when the second inverter circuit is operated in the step-down configuration;
Fig. 17 is a circuit schematic diagram of a mode d of the inverter circuit in the third operation mode when the inverter circuit is operated in the buck configuration;
fig. 18 is a simulation waveform diagram of the inverter circuit of the second embodiment operating in a step-down configuration;
FIG. 19 is a schematic diagram of a circuit diagram of the second embodiment of the rectifying circuit operating in bridge rectification;
fig. 20 is a schematic circuit diagram of the second rectifying circuit according to the embodiment when the second rectifying circuit is operated in a bridge type inversion structure in an energy reverse circulation state;
FIG. 21 is a schematic diagram of a circuit diagram of the rectifying circuit according to the second embodiment in a step-down configuration in a reverse energy flowing state;
FIG. 22 is a first mode of the rectifier circuit in the buck configuration in the fifth mode of operation;
FIG. 23 is a second mode of operation of the rectifier circuit in the buck configuration in the fifth mode of operation;
FIG. 24 is a third mode of operation of the rectifier circuit in the buck configuration in the fifth mode of operation;
FIG. 25 is a fourth mode of operation of the rectifier circuit in the buck configuration in the fifth mode of operation;
FIG. 26 is a schematic diagram of an implementation circuit of a three-stage isolated bi-directional DC-DC converter employing a string-type compensation network according to an embodiment;
FIG. 27 is a schematic diagram of an implementation circuit of a parallel compensation network used in a four-stage isolated bidirectional DC-DC converter according to an embodiment;
FIG. 28 is a schematic diagram of an implementation circuit of an LCL-type compensation network for a five-stage isolated bidirectional DC-DC converter according to an embodiment;
fig. 29 is a schematic diagram of a preferred circuit of a single-stage isolated unidirectional DC-DC converter for implementing unidirectional power transfer in accordance with the sixth embodiment;
fig. 30 is an alternative circuit schematic diagram of a single-stage isolated unidirectional DC-DC converter for implementing unidirectional power transfer in accordance with the sixth embodiment;
FIG. 31 is a simulation result of the battery load voltage of the single-stage isolated bi-directional DC-DC converter of the present invention;
fig. 32 is a graph comparing efficiency curves of a single-stage isolated bidirectional DC-DC converter according to the present invention with those of the prior art.
The variables are described as follows:V 1 -the inverter circuit low-side input voltage,V 2 the output voltage of the rectifying circuit is fed out,V 3 -an inverter circuit high side input voltage,V AB -the output voltage of the inverter circuit,V ab the input voltage of the rectifying circuit is fed in,V C2 -a second stabilizing capacitor C 2 The voltage is applied to the electric motor and the electric motor,V C3 -a third stabilizing capacitor C 3 The voltage is applied to the electric motor and the electric motor,v gp1 、v gp2 、v gp3 、v gp4 controllable switching tubeS p1 、S p2 、S p3 、S p4 Is used for the driving signal of the (a),S p1 、S p2 、S p3 、S p4 、S p5 、S p6 、S p7 、S p8 -a controllable switching tube,S s1 、S s2 、S s3 、S s4 、S s5 、S s6 -controllable switching tube, C 1 、C 2 -a first, a second voltage stabilizing capacitor, C 3 、C 4 -a third and a fourth voltage stabilizing capacitor,L p the primary winding of the transformer is self-inductance,L s -self-inductance of secondary winding of transformer, C p Primary side series compensation capacitor C s The secondary side is connected in series with a compensation capacitor,L f1 -a primary side compensation inductance,L f2 -secondary side compensation inductance, C f1 -primary side parallel compensation capacitor, C f2 -the secondary side is connected in parallel with a compensation capacitor.
Detailed Description
The technical scheme of the application will be specifically described with reference to the accompanying drawings. It should be noted that the embodiments of the present application and the features in the embodiments may be arbitrarily combined with each other without collision. In addition, the magnetic core of the transformer in the embodiment of the application can be made of ferromagnetic materials such as silicon steel sheet, ferrite, microcrystal, ultracrystalline, permalloy or iron cobalt vanadium, and the coil can be made of solid wires, litz wires, copper sheets or PCB coils. The specific materials of the transformer and the shielding coil are not limited by the scheme of the application.
Example 1
Fig. 3 shows a preferred implementation of the single-stage isolated bidirectional DC-DC converter according to the present embodiment, which is used for bidirectional power transmission. The transformer comprises an inverter circuit 1, a primary passive network 2, a transformer primary winding 3, a transformer secondary winding 4, a secondary passive network 5, a rectifying circuit 6 and a load 7. As shown in fig. 3, the inverter circuit 1, the primary passive network 2, the primary winding 3 of the transformer, the secondary winding 4 of the transformer, the secondary passive network 5, and the rectifier circuit 6 are sequentially connected to the load 7.
The inverter circuit 1 includes an inverter bridge configuration unit 1a and an inverter configuration switching unit 1b; the rectifying circuit 6 includes a rectifying bridge structure unit 6a and a rectifying structure switching unit 6b.
Specifically, the inverter bridge construction unit 1a includes a controllable switching tubeS p1 、S p2 、S p3 、S p4 And the first voltage stabilizing capacitor C and the second voltage stabilizing capacitor C 1 、C 2 Wherein the first voltage stabilizing capacitor C 1 Is connected in parallel with a controllable switch tubeS p1 AndS p2 Two ends of the bridge arm formed by the two voltage stabilizing capacitors C 2 Is connected in parallel with a controllable switch tubeS p3 AndS p4 Two ends of the bridge arm are formed; the inversion structure switching unit 1b includes a controllable switching tubeS p5 、S p6 、S p7 And (3) withS p8 Wherein the switching tube is controllableS p5 AndS p6 Reverse connection is connected in series with the controllable switch tubeS p1 AndS p4 Between the drains of (2) a controllable switching tubeS p7 The source electrode of the (E) is connected with the anode of the low-voltage side input, the drain electrode is connected with the controllable switch tubeS p5 Is a source of (a)S p1 Is connected with the drain electrode of the controllable switch tubeS p8 The drain electrode of (C) is connected with the positive electrode of the high-voltage side input, and the source electrode is connected with a controllable switch tubeS p5 AndS p6 Is connected to the drain of the transistor.
The rectifying bridge structural unit 6a comprises a controllable switch tubeS s1 、S s2 、S s3 、S s4 And a third and a fourth voltage stabilizing capacitor C 3 、C 4 Wherein the third stabilizing capacitor C 3 Is connected in parallel with a controllable switch tubeS s1 AndS s2 Two ends of the bridge arm and a fourth voltage stabilizing capacitor C 4 Is connected in parallel with a controllable switch tubeS s3 AndS s4 Two ends of the bridge arm are formed; the rectifying structure switching unit 6b includes a controllable switching tube S s5 And (3) withS s6 Wherein the switching tube is controllableS s5 AndS s6 Reverse connection is connected in series with the controllable switchPipeS p1 AndS p4 Is provided between the drains of the transistors.
As shown in fig. 4, the primary passive network 2 adopts an LCC compensation network, a transformer primary winding 3 and a compensation capacitorC p Compensating inductanceL f1 Sequentially connected, compensating capacitorC f1 Parallel to primary winding 3 and compensation capacitor of transformerC p The secondary passive network 5 also adopts LCC compensation network at two ends of the series branch, the secondary winding 4 of the transformer and the compensation capacitorC s Compensating inductanceL f2 Sequentially connected, compensating capacitorC f2 Parallel connected with the secondary winding 4 of the transformer and the compensation capacitorC s Both ends of the series branch.
The wireless power transfer system structure based on the single-stage isolated bidirectional DC-DC converter implementation of FIG. 3 is shown in FIG. 2.
Example two
The present embodiment provides a control method suitable for the single-stage isolated bidirectional DC-DC converter of the present embodiment, and fig. 5 is a circuit suitable for the control method of the present embodiment. The single-stage isolated DC-DC converter realizes the structure switching control of the inverter circuit 1 and the rectifying circuit 6 by controlling the on-off of controllable switching tubes in the inverter structure switching unit 1b and the rectifying structure switching unit 6 b. The embodiment specifically works under the conditions of two power grades of WPT2 (7.7 kW), WPT3 (11 kW) and two transmission distances of Z1 (100 mm-150 mm) and Z3 (170 mm-250 mm), and the input voltage of the low-voltage side of the inverter circuit V 1 680V, high-voltage side input voltage of inverter circuitV 3 900V.
1. When the converter is operated in the energy forward flow state, the control method of the inverter circuit 1 includes the following operation modes:
first operation mode: when the wireless power transmission system works at the Z1 type transmission distance, as shown in FIG. 6, the controllable switch tubeS p5 、S p6 AndS p7 Conducting,S p8 The power supply is turned off, the inverter circuit 1 realizes low-voltage side input, and the system can realize energy transmission of two power grades of WPT1 and WPT 3; when the system workerWhen the power class of the WPT2 or the WPT3 is more than 3.7kW, the inverter circuit 1 works in a full-bridge inverter structure; as the output power is reduced to the interval of 2kW to 3.7kW, compared with the full-bridge structure, the switching loss of the half-bridge operation mode is lower, and the system efficiency at half-load can be improved, so that the operation mode of the inverter circuit 1 is changed from full-bridge inversion to half-bridge inversion. Specifically, the working modes of the low-voltage side input bridge type inversion are shown in fig. 8, 9 and 10.
Second mode of operation: when the wireless power transmission system works under the Z3 type transmission distance, the low-voltage side input voltage can not meet the energy transmission requirement under the working condition that the WPT3 power class is more than 7.7kW due to the reduction of the coupling coefficient, and the controllable switch tube S p5 、S p6 AndS p8 Conducting,S p7 Turn off, as shown in FIG. 7, the controllable switch tubeS p1 、S p2 And (3) withS p5 Forms a new bridge arm and a controllable switch tubeS p3 、S p4 And (3) withS p6 The other bridge arm is formed, the inverter circuit 1 realizes high-voltage side input, and the energy transmission capacity of the system is further improved; the operation modes of the high-voltage side input bridge inverter are shown in fig. 11, 12 and 13.
Third mode of operation: when the system works under the light load working condition of below 2kW, in order to reduce the system gain, the equivalent output voltage of the inverter bridge needs to be reduced to about 150V, the duty ratio of half-bridge inversion is greatly reduced, and the circulation loss is increased when the inverter bridge is in short circuit. To reduce the loss of the inverter circuit 1, a controllable switching tube is controlledS p7 Conducting,S p5 、S p6 AndS p8 The inverter circuit is turned off and works in a step-down structure. Specifically, the inverter circuit buck structure comprises the following working modes:
modality a: as shown in fig. 14, the controllable switching tube of the inverter bridge structural unit 1aS p1 And (3) withS p4 Conduction and inverter circuit output voltageV AB Is that, wherein V 1 Is low for inverter circuitThe voltage of the input voltage at the voltage side,V C2 is a second voltage stabilizing capacitor C 2 Applying a voltage;
modality b: as shown in fig. 15, the controllable switching tube of the inverter bridge structural unit 1aS p2 And (3) withS p4 Conduction and inverter circuit output voltageV AB Is that；
Modality c: as shown in fig. 16, the controllable switching tube of the inverter bridge structural unit 1a S p2 And (3) withS p3 Conducting, and outputting a short circuit by the inverter circuit 1;
modality d: as shown in fig. 17, the controllable switching tube of the inverter bridge structural unit 1aS p1 And (3) withS p3 Conduction and inverter circuit output voltageV AB Is that；
Modality e: the bridge arm of the inversion bridge structure unit 1a has dead time in the process of switching on and switching off the controllable switch tube, and the inversion circuit 1 forms a dead zone loop through the body diode of the controllable switch tube in the dead time.
As can be seen from the above operation modes and fig. 18, at time 0, the inverter circuit 1 transitions to mode a via mode e, and the switching tube is controllableS p1 Hard-on controllable switch tubeS p4 Soft-opening is realized; 0 to 0%t 0 In the section, the inverter circuit 1 works in a mode a, and the controllable switch tubeS p1 Duty cycle of D 1 ；t 0 At the moment, the inverter circuit 1 transits to the mode b via the mode e, and the controllable switch tubeS p2 Soft-opening is realized;t 0 ~ t 1 in the section, the inverter circuit 1 works in the mode b, and the controllable switch tubeS p2 Duty cycle of 1-D 1 -2D T, wherein DT A dead time duty cycle for mode e; 0 to 0% t 1 Interval controllable switch tubeS p4 Duty cycle of D 2 ；t 1 At this time, the inverter circuit 1 transits to the mode c via the mode e,controllable switch tubeS p3 Soft-opening is realized;t 1 ~ t 2 in the section, the inverter circuit 1 works in a mode c, and the controllable switch tubeS p3 Duty cycle of 1-D 2 -2D T ；t 2 The time works in the same way as time 0. By controlling the duty cycle D 1 With duty cycle D 2 Can adjust the second voltage stabilizing capacitor C 2 Upper voltageV C2 At the same time, the magnitude of the equivalent output voltage of the inverter circuit 1 can be controlled. Controllable switching tube in whole working periodS p2 、S p3 、S p4 Realizing soft-on and controllable switch tube S p1 Is hard open; controllable switch tubeS p1 Can be switched on by adjusting D 1 And D 2 The phase shift angle between the two is realized, and the inverter circuit 1 changes from mode d to mode e to mode a after mode c.
As can be understood by analyzing the output voltage of the inverter circuit 1 in each of the above operation modes, the present embodiment introduces a controllable voltage variable second voltage stabilizing capacitor C into the inverter circuit 1 2 Upper voltageV C2 The primary passive network 2 and the primary winding 3 of the transformer not only transfer energy to the secondary side, but also transfer part of the energy to the capacitor C 2 In the method, the capacitance C is changed by controlling the duty ratio of each working mode in one switching period 2 The magnitude of the voltage and thus the equivalent output voltage of the inverter circuit 1. Under the light load working condition, the half-bridge inversion structure can realize the equivalent output voltage of the 150V inversion circuit by reducing the duty ratio to approximately 0.25, so as to change the output current of the load to maintain constant voltage, and the step-down structure can maintain C 2 D when the voltage is regulated to 340V 1 +D 2 The equivalent output voltage of the same inverter circuit can be realized only by reducing the duty ratio to approximately 0.5. Therefore, compared with a half-bridge inversion structure, the step-down structure reduces short circuit circulation loss under the light load working condition, optimizes the inversion current waveform, further improves the transmission efficiency of the inversion circuit 1 under the light load, and can realize wide-range adjustment of the equivalent output voltage of the inversion circuit 1 on the premise of not greatly adjusting the bus voltageAnd controlling, thereby adjusting the output gain of the converter.
When the converter is operated in the forward energy flow state, the circuit structure of the rectifying circuit 6 is as shown in fig. 19, and the controllable switch tube of the rectifying structure switching unit 6bS s5 And (3) withS s6 The conduction and rectification circuit 6 operates in a bridge rectification configuration.
2. The converter operates in the energy reverse flow state as follows:
controllable switch tube of inversion structure switching unit 1aS p5 And (3) withS p6 Conduction and control controllable switch tubeS p7 And (3) withS p8 The inverter circuit 1 works in a bridge rectifying structure, and the embodiment uses a controllable switch tubeS p7 And opening, and selecting the input of the low-voltage side as a loop in the energy reverse circulation state. The rectifying structure switching unit 6b is configured to implement reverse power transmission of the converter, and includes the following operation modes:
Fourth mode of operation: as shown in fig. 20, when the rectifying structure is switched to the controllable switch tube of the unit 6bS s5 And (3) withS s6 When turned on, the rectifier circuit 6 operates in a bridge inverter configuration.
Fifth mode of operation 5: as shown in fig. 21, when the rectifying structure is switched to the controllable switch tube of the unit 6bS s5 And (3) withS s6 When turned off, the rectifying circuit 6 operates in a step-down configuration. Specifically, the step-down structure of the rectifying circuit 6 includes the following modes of operation:
first modality: as shown in fig. 22, the controllable switching tube of the rectifying bridge structural unit 6aS s1 And (3) withS s4 Input voltage of conducting and rectifying circuitV ab Is that, wherein V 2 For the output voltage of the rectifying circuit,V C3 is a third voltage stabilizing capacity C 3 Applying a voltage;
second modality: as shown in fig. 23, the controllable switching tube of the rectifying bridge structural unit 6aS s1 And (3) withS s3 Input voltage of conducting and rectifying circuitV ab Is that；
Third modality: as shown in fig. 24, the controllable switching tube of the rectifying bridge structural unit 6aS s2 And (3) withS s3 Conducting and outputting a short circuit by the rectifying circuit 6;
fourth modality: as shown in fig. 25, the controllable switching tube of the rectifying bridge structural unit 6aS s2 And (3) withS s4 Input voltage of conducting and rectifying circuitV ab Is that；
Fifth modality: the bridge arm of the rectifying bridge structure unit 6a has dead time in the process of switching on and switching off the controllable switch tube, and the rectifying circuit 6 forms a dead zone loop through the body diode of the controllable switch tube in the dead time.
It should be further noted that, since the method of the present embodiment may be implemented by the converter of the first embodiment, other implementation processes of the method of the present embodiment may refer to the corresponding content of the first embodiment, and will not be described herein.
According to the technical scheme, constant voltage output under the conditions of multiple power levels and transmission distance can be realized within a constant input voltage range, and the functions of the front-stage Buck circuit are integrated in the inverter circuit through structural switching, so that the system volume and cost are effectively reduced, the system efficiency is improved, and the application requirements of a wireless electric energy transmission system on interoperability and energy bidirectional circulation are met.
Example III
Fig. 26 is a schematic diagram of another implementation circuit of a single-stage isolated bidirectional DC-DC converter according to the present application, which is different from the first embodiment in that the primary passive network 2 adopts a series compensation network, and the secondary passive network 5 also adopts a series compensation network. The transformer comprises an inverter circuit 1, a primary passive network 2, a transformer primary winding 3, a transformer secondary winding 4, a secondary passive network 5, a rectifying circuit 6 and a load 7. The inverter circuit 1, the primary passive network 2, the primary winding 3 of the transformer, the secondary winding 4 of the transformer, the secondary passive network 5 and the rectifying circuit 6 are sequentially connected with the load 7.
The inverter circuit 1 includes an inverter bridge configuration unit 1a and an inverter configuration switching unit 1b; the rectifying circuit 6 includes a rectifying bridge structure unit 6a and a rectifying structure switching unit 6b.
Specifically, the inverter bridge construction unit 1a includes a controllable switching tubeS p1 、S p2 、S p3 、S p4 And the first voltage stabilizing capacitor C and the second voltage stabilizing capacitor C 1 、C 2 Wherein the first voltage stabilizing capacitor C 1 Is connected in parallel with a controllable switch tubeS p1 AndS p2 Two ends of the bridge arm formed by the two voltage stabilizing capacitors C 2 Is connected in parallel with a controllable switch tubeS p3 AndS p4 The inversion structure switching unit 1b comprises controllable switch tubes at two ends of a bridge armS p5 、S p6 、S p7 And (3) withS p8 Wherein the switching tube is controllableS p5 AndS p6 Reverse connection is connected in series with the controllable switch tubeS p1 AndS p4 Between the drains of (2) a controllable switching tubeS p7 The source electrode of the (E) is connected with the anode of the low-voltage side input, the drain electrode is connected with the controllable switch tubeS p5 Is a source of (a)S p1 Is connected with the drain electrode of the controllable switch tubeS p8 The drain electrode of (C) is connected with the positive electrode of the high-voltage side input, and the source electrode is connected with a controllable switch tubeS p5 AndS p6 Is connected with the drain electrode of the transistor; the rectifying bridge structural unit 6a comprises a controllable switch tubeS s1 、S s2 、S s3 、S s4 And a third and a fourth voltage stabilizing capacitor C 3 、C 4 Wherein the third stabilizing capacitor C 3 Is connected in parallel with a controllable switch tubeS s1 AndS s2 Two ends of the bridge arm and a fourth voltage stabilizing capacitor C 4 Is connected in parallel with a controllable switch tubeS s3 AndS s4 The rectifying structure switching unit 6b comprises controllable switch tubes at two ends of the bridge arm S s5 And (3) withS s6 Which is provided withWell controllable switch tubeS s5 AndS s6 Reverse connection is connected in series with the controllable switch tubeS p1 AndS p4 Is provided between the drains of the transistors.
Example IV
Fig. 27 is a schematic diagram of another implementation circuit of a single-stage isolated bidirectional DC-DC converter according to the present invention, which is different from the first embodiment in that the primary passive network 2 adopts a parallel compensation network, and the secondary passive network 5 also adopts a parallel compensation network. The transformer comprises an inverter circuit 1, a primary passive network 2, a transformer primary winding 3, a transformer secondary winding 4, a secondary passive network 5, a rectifying circuit 6 and a load 7. The inverter circuit 1, the primary passive network 2, the primary winding 3 of the transformer, the secondary winding 4 of the transformer, the secondary passive network 5 and the rectifying circuit 6 are sequentially connected with the load 7.
The inverter circuit 1 includes an inverter bridge configuration unit 1a and an inverter configuration switching unit 1b; the rectifying circuit 6 includes a rectifying bridge structure unit 6a and a rectifying structure switching unit 6b.
Specifically, the inverter bridge construction unit 1a includes a controllable switching tubeS p1 、S p2 、S p3 、S p4 And the first voltage stabilizing capacitor C and the second voltage stabilizing capacitor C 1 、C 2 Wherein the first voltage stabilizing capacitor C 1 Is connected in parallel with a controllable switch tubeS p1 AndS p2 Two ends of the bridge arm formed by the two voltage stabilizing capacitors C 2 Is connected in parallel with a controllable switch tubeS p3 AndS p4 The inversion structure switching unit 1b comprises controllable switch tubes at two ends of a bridge arm S p5 、S p6 、S p7 And (3) withS p8 Wherein the switching tube is controllableS p5 AndS p6 Reverse connection is connected in series with the controllable switch tubeS p1 AndS p4 Between the drains of (2) a controllable switching tubeS p7 The source electrode of the (E) is connected with the anode of the low-voltage side input, the drain electrode is connected with the controllable switch tubeS p5 Is a source of (a)S p1 Is connected with the drain electrode of the controllable switch tubeS p8 The drain electrode of (C) is connected with the positive electrode of the high-voltage side input, and the source electrode is connected with a controllable switch tubeS p5 AndS p6 Is connected with the drain electrode of the transistor; the rectifying bridge structural unit 6a comprises a controllable switch tubeS s1 、S s2 、S s3 、S s4 And a third and a fourth voltage stabilizing capacitor C 3 、C 4 Wherein the third stabilizing capacitor C 3 Is connected in parallel with a controllable switch tubeS s1 AndS s2 Two ends of the bridge arm and a fourth voltage stabilizing capacitor C 4 Is connected in parallel with a controllable switch tubeS s3 AndS s4 The two ends of the bridge arm are composed, and the rectifying structure switching unit 6b is composed of a controllable switch tubeS s5 And (3) withS s6 Composition, wherein the switching tube is controllableS s5 AndS s6 Reverse connection is connected in series with the controllable switch tubeS p1 AndS p4 Is provided between the drains of the transistors.
Example five
Fig. 28 is a schematic diagram of another implementation circuit of a single-stage isolated bidirectional DC-DC converter according to the present invention, which is different from the first embodiment in that the primary passive network 2 adopts an LCL compensation network, and the secondary passive network 5 also adopts an LCL compensation network. The transformer comprises an inverter circuit 1, a primary passive network 2, a transformer primary winding 3, a transformer secondary winding 4, a secondary passive network 5, a rectifying circuit 6 and a load 7. The inverter circuit 1, the primary passive network 2, the primary winding 3 of the transformer, the secondary winding 4 of the transformer, the secondary passive network 5 and the rectifying circuit 6 are sequentially connected with the load 7.
The inverter circuit 1 includes an inverter bridge configuration unit 1a and an inverter configuration switching unit 1b; the rectifying circuit 6 includes a rectifying bridge structure unit 6a and a rectifying structure switching unit 6b.
Specifically, the inverter bridge construction unit 1a includes a controllable switching tubeS p1 、S p2 、S p3 、S p4 And the first voltage stabilizing capacitor C and the second voltage stabilizing capacitor C 1 、C 2 Wherein the first voltage stabilizing capacitor C 1 Is connected in parallel with a controllable switch tubeS p1 AndS p2 Two ends of the bridge arm formed by the two voltage stabilizing capacitors C 2 Is connected in parallel with a controllable switch tubeS p3 AndS p4 The inversion structure switching unit 1b comprises controllable switch tubes at two ends of a bridge armS p5 、S p6 、S p7 And (3) withS p8 Wherein the switching tube is controllableS p5 AndS p6 Reverse connection is connected in series with the controllable switch tubeS p1 AndS p4 Between the drains of (2) a controllable switching tubeS p7 The source electrode of the (E) is connected with the anode of the low-voltage side input, the drain electrode is connected with the controllable switch tubeS p5 Is a source of (a)S p1 Is connected with the drain electrode of the controllable switch tubeS p8 The drain electrode of (C) is connected with the positive electrode of the high-voltage side input, and the source electrode is connected with a controllable switch tubeS p5 AndS p6 Is connected with the drain electrode of the transistor; the rectifying bridge structural unit 6a comprises a controllable switch tubeS s1 、S s2 、S s3 、S s4 And a third and a fourth voltage stabilizing capacitor C 3 、C 4 Wherein the third stabilizing capacitor C 3 Is connected in parallel with a controllable switch tubeS s1 AndS s2 Two ends of the bridge arm and a fourth voltage stabilizing capacitor C 4 Is connected in parallel with a controllable switch tubeS s3 AndS s4 The rectifying structure switching unit 6b comprises controllable switch tubes at two ends of the bridge arm S s5 And (3) withS s6 Wherein the switching tube is controllableS s5 AndS s6 Reverse connection is connected in series with the controllable switch tubeS p1 AndS p4 Is provided between the drains of the transistors.
Example six
Fig. 29 is a schematic diagram of another implementation circuit of a single-stage isolated unidirectional DC-DC converter according to the present invention, which is different from the first embodiment in that the converter structure of the present embodiment only implements a unidirectional power transmission function, and the primary passive network 2 adopts a series compensation network, and the secondary passive network 5 also adopts a series compensation network. The transformer comprises an inverter circuit 1, a primary passive network 2, a transformer primary winding 3, a transformer secondary winding 4, a secondary passive network 5, a rectifying circuit 6 and a load 7. The inverter circuit 1, the primary passive network 2, the primary winding 3 of the transformer, the secondary winding 4 of the transformer, the secondary passive network 5 and the rectifying circuit 6 are sequentially connected with the load 7.
The inverter circuit 1 includes an inverter bridge configuration unit 1a and an inverter configuration switching unit 1b; the inversion bridge type structure unit 1a comprises an inversion bridge and two voltage stabilizing capacitors, wherein the two voltage stabilizing capacitors are respectively connected in parallel at two ends of two bridge arms of the inversion bridge; the inversion structure switching unit 1b comprises two controllable switching tubes and two diodes, wherein the two diodes are respectively connected in series with the anodes of the two input sides of the inversion circuit, and the two controllable switching tubes are reversely connected in series between the drains of the upper tubes of the two bridge arms of the inversion bridge.
Specifically, the inverter bridge construction unit 1a includes a controllable switching tubeS p1 、S p2 、S p3 、S p4 And the first voltage stabilizing capacitor C and the second voltage stabilizing capacitor C 1 、C 2 Wherein the first voltage stabilizing capacitor C 1 Is connected in parallel with a controllable switch tubeS p1 AndS p2 Two ends of the bridge arm formed by the two voltage stabilizing capacitors C 2 Is connected in parallel with a controllable switch tubeS p3 AndS p4 The inversion structure switching unit 1b comprises controllable switch tubes at two ends of a bridge armS p5 、S p6 Diode D 1 、D 2 Wherein the switching tube is controllableS p5 AndS p6 Reverse connection is connected in series with the controllable switch tubeS p1 AndS p4 Between the drains of (a) diode D 1 The anode of the (C) is connected with the anode of the low-voltage side input, and the cathode is connected with a controllable switch tubeS p5 Is a source of (a)S p1 Is connected with the drain electrode of diode D 2 The anode of the (C) is connected with the anode of the high-voltage side input, and the cathode is connected with a controllable switch tubeS p5 AndS p6 Is connected with the drain electrode of the transistor; the rectifying circuit 6 comprises a controllable switching tubeS s1 、S s2 、S s3 、S s4 And voltage stabilizing capacitor C 4 Wherein the fourth voltage stabilizing capacitor C 4 Is connected in parallel with a controllable switch tubeS s3 AndS s4 The rectifier circuit 6 works in a bridge structure at two ends of the bridge arm. Alternatively, as shown in FIG. 30, a controllable switching tubeS s1 、S s4 Diode D may also be used 3 、D 4 Instead of this.
Example seven
For the control method of the single-stage isolated unidirectional DC-DC converter in the sixth embodiment, the converter operates in the forward energy circulation state in the following operation modes:
Operation mode a: controllable switch tube of inversion structure switching unit 1bS p5 、S p6 And (3) withS p7 The switching on and the inverter circuit 1 works in a low-voltage input bridge type inverter structure; the rectifying circuit 6 works in a bridge rectifying structure;
operation mode b: controllable switch tube of inversion structure switching unit 1bS p5 、S p6 And (3) withS p8 The switching on and the inverter circuit 1 works in a high-voltage input bridge type inverter structure; the rectifying circuit 6 works in a bridge rectifying structure;
operation mode c: controllable switch tube of inversion structure switching unit 1bS p5 And (3) withS p6 The switch-off is performed and the switch-off is performed,S p7 conducting; the inverter circuit 1 operates in a step-down configuration; the rectifying circuit 6 operates in a bridge rectifying configuration. Specifically, the inverter circuit 1 operates in a step-down configuration including:
modality a: controllable switching tube of inversion bridge type structure unit 1aS p1 And (3) withS p4 Conduction and inverter circuit output voltageV AB Is that；
Modality b: controllable switching tube of inversion bridge type structure unit 1aS p2 And (3) withS p4 Conduction and inverter circuit output voltageV AB Is that；
Modality c: controllable switching tube of inversion bridge type structure unit 1aS p2 And (3) withS p3 Conducting, and outputting a short circuit by the inverter circuit 1;
modality d: controllable switching tube of inversion bridge type structure unit 1aS p1 And (3) withS p3 Conduction and inverter circuit output voltageV AB Is that；
Modality e: the bridge arm of the inversion bridge structure unit 1a has dead time in the process of switching on and switching off the controllable switch tube, and the inversion circuit 1 forms a dead zone loop through the body diode of the controllable switch tube in the dead time.
Verification example 1
The present verification example adopts the circuit configuration shown in fig. 5 in the first embodiment, and simulation verification is performed in Saber according to the control method of the second embodiment.
L p The primary winding of the transformer is self-inductance,L s -self-inductance of secondary winding of transformer, C p Primary side series compensation capacitor C s The secondary side is connected in series with a compensation capacitor,L f1 -a primary side compensation inductance,L f2 -secondary side compensation inductance, C f1 -primary side parallel compensation capacitor, C f2 The secondary side is connected in parallel with a compensation capacitor,Mmutual inductance between the primary and secondary windings of the transformer.
Wherein, the transformer parameters are:L p = 46.69μH，L s = 36.37 μH; the coupling coefficient is divided into three transmission distances of 0.1, 0.2 and 0.3 respectively; the primary passive network parameters are as followsL f1 =23.5μH，C f1 =149.2nF，C p =151.2nF, the secondary passive network parameters are divided into two groups according to the transmission distance, when the coupling coefficient is 0.2 or 0.3,L f2 = 25.76μH，C f2 =136.1nF，C s = 330.3nF; when the coupling coefficient is 0.1,L f2 =11.8μH，C f2 =297.1nF，C s =142.7nF; controllable switch tube of inverter circuit in simulationS p1 、S p2 、S p3 、S p4 、S p5 、S p6 、S p7 、S p8 The model of simulation is C2M0025120D, and the switching frequency of the inverter bridge is 85kHz; controllable switch tube of rectifying circuitS s1 、S s2 、S s3 、S s4 、S s5 、S s6 The model is SCH2080KE.
The input voltage of the inverter circuit at the low-voltage side is regulated to 680-800V, the input voltage of the inverter circuit at the high-voltage side is set to 900V, and when the coupling coefficient is 0.3 by taking 7.7kW working condition as an example, the input voltage of the inverter bridge is set to 680V, and the inverter circuit works in a step-down structure and is controlled to switch a tube S p1 Duty ratio is set to 0.47, and the switch tube is controllableS p4 The duty ratio is set to 0.80 and the dead zone is set to 0.01; when the coupling coefficient is 0.1 or 0.2, the input voltage of the inverter bridge is set to 900V, and the inverter bridge works in a full bridge structure, wherein the battery voltage simulation result is as shown in fig. 31, and the voltage of the load battery can be always kept at about 400V. The simulation results of the transmission efficiency of the converter are shown in table 1, and it can be seen that under the condition that the primary passive network compensation parameters are kept unchanged, the converter structure provided by the invention can realize energy transmission under three transmission distance grades Z1 (100 mm-150 mm), Z2 (140 mm-210 mm) and Z3 (170 mm-250 mm) within the range that the input voltage is basically kept unchanged, can meet the wide load range working condition of full load (7.7 kW) to 1/10 load (0.7 kW) under each transmission distance grade, and can be downward compatible with the transmission requirement of 3.7kW power grade; in addition, according to the results shown in Table 1, the full load efficiency of the system can still reach 89.84% when the coupling coefficient is 0.1, the light load efficiency of the 0.7kW working condition reaches 85.6%, the minimum system efficiency is higher than 85% in the international standard SAE J2954, and the compatibility of the 7.7kW power class and the 3.7kW power class in the standard is realized, so that the invention can meet the interoperability requirement of the wireless electric energy transmission system on the multi-gear power class and the multi-gear transmission distance.
Fig. 32 shows the efficiency of a prior art combined Buck converter at a coupling coefficient of 0.2 compared to the efficiency of the present application at a power level of 7.7 kW. The comparison of efficiency curves in the graph can find that the technical scheme of the application optimizes the pre-stage Buck transformationAfter the device is used, the system efficiency can be further improved by 1% -2%. In addition, the technical scheme of the application can also omit the Buck converter for comparison under the power level of 7.7kWThe volume and the cost of the system are effectively reduced by the inductor with the size. The simulation results of the transmission efficiency of the single-stage isolated DC-DC converter are shown in the following table 1:
table 1:
。
those of ordinary skill in the art will appreciate that all or a portion of the steps of the methods described above may be implemented by a program that instructs associated hardware, and the program may be stored on a computer readable storage medium such as a read-only memory, a magnetic or optical disk, etc. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiment may be implemented in the form of hardware, or may be implemented in the form of a software functional module. The present application is not limited to any specific form of combination of hardware and software.
The above-mentioned design of passive network parameters can realize transmission requirements of various power classes, which are only preferred examples of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides a two-way DC-DC converter of single-stage isolation type, includes inverter circuit (1), primary side passive network (2), transformer primary side winding (3), transformer secondary side winding (4), secondary side passive network (5), rectifier circuit (6) and load (7) at least, inverter circuit (1), primary side passive network (2), transformer primary side winding (3), transformer secondary side winding (4), secondary side passive network (5), rectifier circuit (6) and load (7) connect gradually, inverter circuit (1) and rectifier circuit (6) include controllable switching tube and steady voltage electric capacity, its characterized in that: the inverter circuit (1) comprises an inverter bridge structure unit (1 a) and an inverter structure switching unit (1 b); the inversion bridge type structure unit (1 a) comprises an inversion bridge and two voltage stabilizing capacitors, wherein the two voltage stabilizing capacitors are respectively connected in parallel at two ends of two bridge arms of the inversion bridge; the inversion structure switching unit (1 b) comprises four controllable switching tubes, wherein two controllable switching tubes are respectively connected in series with positive poles of two input sides of an inversion circuit, and the other two switching tubes are connected in reverse series between drains of upper tubes of two bridge arms of the inversion bridge; the rectifying circuit (6) comprises a rectifying bridge type structure unit (6 a) and a rectifying structure switching unit (6 b), wherein the rectifying bridge type structure unit (6 a) comprises a rectifying bridge and two voltage stabilizing capacitors, and the two voltage stabilizing capacitors are respectively connected in parallel at two ends of two bridge arms of the rectifying bridge; the rectification structure switching unit (6 b) comprises two controllable switching tubes which are reversely connected in series between drains of upper tubes of two bridge arms of the rectification bridge;
The inverter bridge structure unit (1 a) in the inverter circuit (1) comprises a controllable switch tubeS p1 、S p2 、S p3 、S p4 First voltage stabilizing capacitor C 1 A second voltage stabilizing capacitor C 2 Wherein the first voltage stabilizing capacitor C 1 Is connected in parallel with a controllable switch tubeS p1 AndS p2 Two ends of the bridge arm formed by the two voltage stabilizing capacitors C 2 Is connected in parallel with a controllable switch tubeS p3 AndS p4 Two ends of the bridge arm are formed; the inversion structure switching unit (1 b) comprises a controllable switch tubeS p5 、S p6 、S p7 And (3) withS p8 Wherein the switching tube is controllableS p5 And (3) withS p6 Are connected in reverse and connected in series with a controllable switch tubeS p1 AndS p4 Between the drains of (2) a controllable switching tubeS p7 The source electrode of the (E) is connected with the anode of the low-voltage side input, the drain electrode is connected with the controllable switch tubeS p5 Is a source of (a)S p1 Is connected with the drain electrode of the controllable switch tubeS p8 The drain electrode of (C) is connected with the positive electrode of the high-voltage side input, and the source electrode is connected with a controllable switch tubeS p5 AndS p6 Is connected with the drain electrode of the transistor;
the rectifying bridge structure unit (6 a) in the rectifying circuit (6) comprises a controllable switch tubeS s1 、S s2 、S s3 、S s4 Third voltage stabilizing capacitor C 3 Fourth voltage stabilizing capacitor C 4 Wherein the third stabilizing capacitor C 3 Is connected in parallel with a controllable switch tubeS s1 And (3) withS s2 Two ends of the bridge arm and a fourth voltage stabilizing capacitor C 4 Is connected in parallel with a controllable switch tubeS s3 And (3) withS s4 Two ends of the bridge arm are formed; the rectifying structure switching unit (6 b) comprises a controllable switch tubeS s5 And (3) withS s6 Wherein the switching tube is controllable S s5 And (3) withS s6 Reverse connection is connected in series with the controllable switch tubeS p1 AndS p4 Is provided between the drains of the transistors.
2. The single-stage isolated bidirectional DC-DC converter of claim 1, wherein: the primary side passive network (2) and the secondary side passive network (5) adopt serial-serial type, serial-parallel type, parallel-serial type, LCL type or LCC type compensation networks respectively.
3. The utility model provides a single-stage isolated unidirectional DC-DC converter, includes inverter circuit (1), primary side passive network (2), transformer primary side winding (3), transformer secondary side winding (4), secondary side passive network (5), rectifier circuit (6) and load (7) at least, inverter circuit (1), primary side passive network (2), transformer primary side winding (3), transformer secondary side winding (4), secondary side passive network (5), rectifier circuit (6) and load (7) connect gradually, inverter circuit (1) and rectifier circuit (6) include controllable switch tube and steady voltage electric capacity, its characterized in that: the inverter circuit (1) comprises an inverter bridge structure unit (1 a) and an inverter structure switching unit (1 b); the inversion bridge type structure unit (1 a) comprises an inversion bridge and two voltage stabilizing capacitors, wherein the two voltage stabilizing capacitors are respectively connected in parallel at two ends of two bridge arms of the inversion bridge; the inversion structure switching unit (1 b) comprises two controllable switching tubes and two diodes, wherein the two diodes are respectively connected in series with the positive poles of the two input sides of the inversion circuit, and the two controllable switching tubes are reversely connected in series between the drains of the upper tubes of the two bridge arms of the inversion bridge;
The inverter bridge structure unit (1 a) in the inverter circuit (1) comprises a controllable switch tubeS p1 、S p2 、S p3 、S p4 First voltage stabilizing capacitor C 1 A second voltage stabilizing capacitor C 2 Wherein the first voltage stabilizing capacitor C 1 Is connected in parallel with a controllable switch tubeS p1 AndS p2 Two ends of the bridge arm formed by the two voltage stabilizing capacitors C 2 Is connected in parallel with a controllable switch tubeS p3 AndS p4 Two ends of the bridge arm are formed; the inversion structure switching unit (1 b) comprises a controllable switch tubeS p5 、S p6 Diode D 1 、D 2 Wherein the switching tube is controllableS p5 And (3) withS p6 Are connected in reverse and connected in series with a controllable switch tubeS p1 AndS p4 Between the drains of (a) diode D 1 The anode of the (C) is connected with the anode of the low-voltage side input, and the cathode is connected with a controllable switch tubeS p5 Is a source of (a)S p1 Is connected with the drain electrode of diode D 2 The anode of the (C) is connected with the anode of the high-voltage side input, and the cathode is connected with a controllable switch tubeS p5 AndS p6 Is connected to the drain of the transistor.
4. A single-stage isolated unidirectional DC-DC converter as claimed in claim 3, wherein: the rectifying circuit comprises a controllable switch tubeS s1 、S s2 、S s3 、S s4 And voltage stabilizing capacitor C 4 Wherein the fourth voltage stabilizing capacitor C 4 Is connected in parallel with a controllable switch tubeS s3 AndS s4 The rectifier circuit works in a bridge structure at two ends of the bridge arm; or the rectifying circuit comprises a controllable switch tube D 3 、D 4 、S s3 、S s4 And voltage stabilizing capacitor C 4 Wherein the fourth voltage stabilizing capacitor C 4 Is connected in parallel with a controllable switch tube S s3 AndS s4 The rectifier circuit works in a bridge structure at two ends of the bridge arm.
5. A control method of a single-stage isolated bidirectional DC-DC converter based on the single-stage isolated bidirectional DC-DC converter of claim 1, comprising the following processes:
1) The converter includes the following modes of operation when operating in an energy forward flow state:
first operation mode: controllable switch tube of inversion structure switching unit (1 b)S p5 、S p6 And (3) withS p7 The switching-on inverter circuit (1) works in a low-voltage input bridge type inverter structure; controllable switch tube of rectifying structure switching unit (6 b) of rectifying circuit (6)S s5 And (3) withS s6 The conduction and rectification circuit (6) works in a bridge rectification structure;
second mode of operation: controllable switch tube of inversion structure switching unit (1 b)S p5 、S p6 And (3) withS p8 The switching-on inverter circuit (1) works in a high-voltage input bridge type inverter structure; controllable switch tube of rectifying structure switching unit (6 b) of rectifying circuit (6)S s5 And (3) withS s6 The conduction and rectification circuit (6) works in a bridge rectification structure;
third mode of operation: controllable switch tube of inversion structure switching unit (1 b)S p5 And (3) withS p6 The switch-off is performed and the switch-off is performed,S p7 conducting; the inverter circuit (1) works in a step-down type structure; controllable switch tube of rectifying structure switching unit (6 b) of rectifying circuit (6) S s5 And (3) withS s6 The conduction and rectification circuit (6) works in a bridge rectification structure;
2) When the converter works in the energy reverse circulation state, the controllable switch tube of the inversion structure switching unit (1 b)S p5 And (3) withS p6 Conduction and control controllable switch tubeS p7 And (3) withS p8 The on-off of the inverter circuit (1) selects an energy circulation loop, and the inverter circuit works in a bridge type rectifying structure; the rectifying structure switching unit (6 b) is used for realizing reverse power transmission of the converter, and comprises the following working modes:
fourth mode of operation: controllable switch tube of rectifying structure switching unit (6 b)S s5 And (3) withS s6 The conduction and rectification circuit (6) works in a bridge type inversion structure;
fifth mode of operation: controllable switch tube of rectifying structure switching unit (6 b)S s5 And (3) withS s6 The rectifier circuit (6) is operated in a step-down configuration.
6. The control method of a single-stage isolated bidirectional DC-DC converter as recited in claim 5 wherein the rectifying circuit in the fifth operating mode operates in a buck configuration comprises:
first modality: controllable switching tube of rectifying bridge type structural unit (6 a)S s1 And (3) withS s4 Input voltage of conducting and rectifying circuitV ab Is that, wherein V 2 For the output voltage of the rectifying circuit,V C3 is a third voltage stabilizing capacitor C 3 Applying a voltage;
second modality: controllable switching tube of rectifying bridge type structural unit (6 a) S s1 And (3) withS s3 Input voltage of conducting and rectifying circuitV ab Is that；
Third modality: controllable switching tube of rectifying bridge type structural unit (6 a)S s2 And (3) withS s3 Conducting, and outputting a short circuit by the rectifying circuit (6);
fourth modality: controllable switching tube of rectifying bridge type structural unit (6 a)S s1 And (3) withS s4 Input voltage of conducting and rectifying circuitV ab Is that；
Fifth modality: the bridge arm of the rectifying bridge type structure unit (6 a) has dead time in the on and off processes of the controllable switch tube, and the rectifying circuit (6) forms a dead loop through the body diode of the controllable switch tube in the dead time.
7. The control method of a single-stage isolated bidirectional DC-DC converter as recited in claim 5 or 6, wherein the inverter circuit in the third operation mode operates in a buck configuration comprising:
modality a: controllable switching tube of inversion bridge type structure unit (1 a)S p1 And (3) withS p4 Conduction and inverter circuit output voltageV AB Is that, wherein V 1 For the low-side input voltage of the inverter circuit,V C2 is a second voltage stabilizing capacitor C 2 Applying a voltage;
modality b: controllable switching tube of inversion bridge type structure unit (1 a)S p2 And (3) withS p4 Conduction and inverter circuit output voltageV AB Is that；
Modality c: controllable switching tube of inversion bridge type structure unit (1 a)S p2 And (3) withS p3 Conduction, IOV AB Is that；
Modality e: the bridge arm of the inversion bridge type structure unit (1 a) has dead time in the turn-on and turn-off processes of the controllable switch tube, and the inversion circuit (1) forms a dead zone loop through the body diode of the controllable switch tube in the dead time.
8. A control method of a single-stage isolated unidirectional DC-DC converter, based on the single-stage isolated unidirectional DC-DC converter of claim 3, the converter operating in a forward energy flow state comprising the following modes of operation:
operation mode a: controllable switch of inversion structure switching unit (1 b)PipeS p5 、S p6 And (3) withS p7 The switching-on inverter circuit (1) works in a low-voltage input bridge type inverter structure; the rectifying circuit (6) works in a bridge rectifying structure;
operation mode b: controllable switch tube of inversion structure switching unit (1 b)S p5 、S p6 And (3) withS p8 The switching-on inverter circuit (1) works in a high-voltage input bridge type inverter structure; the rectifying circuit (6) works in a bridge rectifying structure;
operation mode c: controllable switch tube of inversion structure switching unit (1 b)S p5 And (3) withS p6 The switch-off is performed and the switch-off is performed,S p7 conducting; the inverter circuit (1) works in a step-down type structure; the rectifying circuit (6) operates in a bridge rectifying configuration.
9. The control method of a single-stage isolated unidirectional DC-DC converter as claimed in claim 8, wherein the inverter circuit in the operation mode c operates in a buck-type configuration comprising:
modality a: controllable switching tube of inversion bridge type structure unit (1 a)S p1 And (3) withS p4 Conduction and inverter circuit output voltageV AB Is that；
Modality b: controllable switching tube of inversion bridge type structure unit (1 a) S p2 And (3) withS p4 Conduction and inverter circuit output voltageV AB Is that；
Modality c: controllable switching tube of inversion bridge type structure unit (1 a)S p2 And (3) withS p3 Conducting, and outputting a short circuit by the inverter circuit (1);
modality d: controllable switching tube of inversion bridge type structure unit (1 a)S p1 And (3) withS p3 Conduction and inverter circuit output voltageV AB Is that；
Modality e: the bridge arm of the inversion bridge type structure unit (1 a) has dead time in the process of switching on and switching off the controllable switch tube, and the inversion circuit (1) forms a dead zone loop through the body diode of the controllable switch tube in the dead time;
wherein ,V 1 for the low-side input voltage of the inverter circuit,V C2 is a second voltage stabilizing capacitor C 2 And (5) applying a voltage.
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