CN105356758A - High frequency isolated DC-DC two stage power conversion system structure - Google Patents
High frequency isolated DC-DC two stage power conversion system structure Download PDFInfo
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- CN105356758A CN105356758A CN201510895604.1A CN201510895604A CN105356758A CN 105356758 A CN105356758 A CN 105356758A CN 201510895604 A CN201510895604 A CN 201510895604A CN 105356758 A CN105356758 A CN 105356758A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 27
- 238000002955 isolation Methods 0.000 claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims abstract description 14
- 230000009466 transformation Effects 0.000 claims abstract description 14
- 230000009977 dual effect Effects 0.000 claims description 12
- 230000000694 effects Effects 0.000 abstract description 2
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 230000005669 field effect Effects 0.000 description 10
- 238000011161 development Methods 0.000 description 4
- 230000002459 sustained effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005404 monopole Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
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Classifications
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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
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H02J7/0027—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a high frequency isolated DC-DC two stage power conversion system structure, which comprises a three-level voltagereducing converter and a series resonance converter that are combined as a whole; the three-level voltage reducing converter comprises a three-level power transformation module and an LC low pass filter; the three-level power transformation module is connected with the LC low pass filter in series directly; the series resonance converter comprises a full bridge inverter, a high-frequency transformer and a rectifier bridge; the right end of the LC low pass filter is connected with the full bridge inverter directly; the middle point of the full bridge inverter is connected with a leakage inductor Lr and a resonant capacitor Cr of the high-frequency transformer; the secondary side of the high-frequency transformer is connected with the midpoints of two bridge arms of the rectifier bridge; and the right end of the rectifier bridge is connected with an output voltage stabilization capacitor in parallel. The three-level topology structure at the front end is quite suitable for application occasions where input voltage is high, and the series resonance converter is adopted at the rear end, therefore, the effect of high frequency isolation is realized; and the charging requirement for most electric automobiles can be satisfied.
Description
Technical field
The present invention relates to power conversion system field, be specifically related to a kind of high-frequency isolation type DC-DC dual stage power transformation system structure.
Background technology
Along with the quickening day by day of social development speed, the demand of the mankind to the energy improves constantly, the day by day exhausted and social development of fossil energy is to the contradiction between the high demand of the energy, people are forced more and more to pay close attention to the development and utilization of regenerative resource, in order to the environmental requirement of the shortage and energy-saving and emission-reduction of tackling petroleum resources, electric automobile becomes study hotspot with the feature of its high efficiency, low emission.Electric automobile key issue is quick charge, the invention of electric vehicle rapid charging station and construction promote one of ev industry development key factor, and the research and development of electric automobile charging station core apparatus in recent years become the focus of Ge great colleges and universities of the world and business research.
Electrical network electric energy can be converted to the electric energy required for vehicle mounted dynamic battery by charging electric vehicle technology, thus for Automobile drive.The problems such as current charging electric vehicle form is varied, but mainly can be divided into AC charging and DC charging, and AC charging voltage is low, electric current is little, there is load low, and the charging interval is long, so purposes is limited to very much.And DC charging is also called quick charge, object pours a large amount of electric energy in the short time to realize quick charge, DC charging can realize high-power energy conversion, greatly can shorten the charging interval, develops continuous quickening over therefore the shortcoming that compensate for electric automobile flying power difference enters year.
The existing research to electric automobile direct current quick charge structure is mainly divided into two classes: a kind of is that application public exchange power distribution network realizes electric vehicle rapid charging by AC-DC converter, another kind of for adopting powerful rectifying device to carry out DC-DC transfer pair battery again charge as three-phase rectifier constructs common DC bus, consider obviously is that the second way is more reasonable, not only can reduce the quantity of total system converting means, and easier grid-connected power generation system to be accessed.The main power conversion application between DC bus to electric automobile of the present invention.The existing research to the DC-DC power conversion unit in electric vehicle rapid charging station mainly comprises isolated form and non-isolation type two kinds, whether its essential difference is for adopting high frequency transformer will to carry out electrical isolation between constrained input, simultaneously electric vehicle rapid charging station must can meet many electric automobiles and charges simultaneously, in order to eliminate the impact between many electric automobiles charging simultaneously, isolation type DC-DC converter a kind ofly better to select.
Summary of the invention
For solving the problem, the invention provides a kind of high-frequency isolation type DC-DC dual stage power transformation system structure, system front end adopts three-level topology structure also very applicable for the application scenario that input voltage is high, System Back-end adopts series resonant converter to realize high-frequency isolation effect, can power density be improved, the charging requirement of most electric automobile can be met.
For achieving the above object, the technical scheme that the present invention takes is:
A kind of high-frequency isolation type DC-DC dual stage power transformation system structure, comprise the three-level buck converter and series resonant converter that are combined as a whole, described three-level buck converter comprises three level power conversion modules and LC low pass filter, and three level power conversion modules is directly connected with LC low pass filter; Described series resonant converter comprises full-bridge inverter and high frequency transformer and rectifier bridge, and LC low pass filter right-hand member is directly connected with full-bridge inverter, the mid point of full-bridge inverter respectively with the leakage inductance L in high frequency transformer
rwith resonant capacitance C
rconnect, high frequency transformer secondary side is connected with two brachium pontis mid points of rectifier bridge, rectifier bridge right-hand member Parallel opertation electric capacity of voltage regulation.
Wherein, described three level power conversion modules is by two input electric capacity of voltage regulation C
s1, C
s2, two switching tube Q1, Q2 (insulated gate bipolar transistor IGBT or mos field effect transistor MOSFET etc.) and two fly-wheel diodes or switching tube (insulated gate bipolar transistor IGBT or mos field effect transistor MOSFET etc.) D
s1, D
s2form, upper brachium pontis switching tube Q1 and sustained diode
s1series connection then with input electric capacity of voltage regulation C
s1parallel connection, lower brachium pontis switching tube Q2 and sustained diode
s1with input electric capacity of voltage regulation C while of series connection
s2parallel connection, input electric capacity of voltage regulation C
s1, C
s2series connection, input electric capacity of voltage regulation C
s1upper end be input power positive pole T, input electric capacity of voltage regulation C
s2lower end be input power negative pole B, upper and lower two brachium pontis series connection, upper end and input power positive pole T-phase company, lower end is connected with input power negative pole B, the mid point of two brachium pontis and DC side electric capacity of voltage regulation C
s1, C
s2draw midpoint potential M to connect, the input side of three level power conversion modules is provided with input port T, M, B, T, M, B tri-ports can be accessed three output ports of ambipolar DC bus, also can only by the output port of T, B two port access monopole type DC buss, three level power conversion modules outlet side is directly connected with LC low pass filter.
Wherein, described LC low pass filter is by 2 symmetrical filter inductance L
f1, L
f2and a filter capacitor C
fcomposition, filter inductance L
f1, L
f2with filter capacitor C
fseries connection, filter capacitor C
fat filter inductance L
f1, L
f2centre, from filter capacitor C
foutput port 1 and the port 2 of LC low pass filter are drawn in two ends; LC low pass filter left end is connected with three level conversion module and forms three-level buck converter, and LC low pass filter right-hand member exit 1 is directly connected with full-bridge inverter two brachium pontis two ends in parallel with end 2.
Wherein, described full-bridge inverter comprises two brachium pontis, two brachium pontis parallel connections, and one of them brachium pontis is by switching tube S1, S3 (insulated gate bipolar transistor IGBT or mos field effect transistor MOSFET etc.), diode D1, D3, shunt capacitance C1, C3 are formed; Another brachium pontis by switching tube S2, S4, diode D2, D4, shunt capacitance C2, C4 are formed, and switching tube S1 and S3 connects, and switching tube S2 and S4 connects, the mid point of two brachium pontis respectively with the primary side leakage inductance L in high frequency transformer
rwith resonant capacitance C
rconnect.
Wherein, described high frequency transformer is the equivalent structure of physical device, comprises primary side leakage inductance L
r, magnetizing inductance L
mand an ideal transformer, magnetizing inductance L
min parallel with ideal transformer thereafter and then with primary side leakage inductance L
rwith resonant capacitance C
rseries connection, two lead-out wires of described high frequency transformer secondary side are connected with two brachium pontis mid points in parallel of rectifier bridge respectively.
Wherein, described rectifier bridge is composed in parallel by front brachium pontis and rear brachium pontis, and front brachium pontis is by diode or switching tube (insulated gate bipolar transistor IGBT or mos field effect transistor MOSFET etc.) D
r1, D
r2in series, rear brachium pontis is by diode or switching tube (insulated gate bipolar transistor IGBT or mos field effect transistor MOSFET etc.) D
r3, D
r4in series, the mid point lead-out wire of front brachium pontis and rear brachium pontis exports with high frequency transformer secondary side and is connected, rectifier bridge right-hand member Parallel opertation electric capacity of voltage regulation.
The present invention has following beneficial effect:
The no-voltage that 1, can realize the active switching tube of series resonant converter inverter side in full-load range is open-minded, the zero-current switching of rear end rectifier bridge diode, greatly can reduce switching loss, simultaneously, high frequency transformer primary side exciting current can change along with the adjustment change of output voltage, reduces circulation and raises the efficiency;
2, system front end adopts three-level structure, and the voltage stress that switching tube bears is the half of overall DC input voitage, and this structure is applicable to being applied in high, the powerful occasion of input voltage very much, adopts the power switch pipe of low voltage grade simultaneously;
3, when in access bipolarity DC bus system, front end three-level buck converter, by regulating the HVDC Modulation ratio of upper and lower switching tube, effectively can regulate the imbalance of ambipolar DC bus power output;
4, its front end three-level buck converter adopts phase-shifting carrier wave to control to increase switch equivalent frequency, makes outputting inductance current ripple frequency be two times of switching frequency, effectively can reduce the volume exporting low pass filter;
5, when converter works in constant current mode output, although the voltage being input to series resonant converter is constantly change, the output current of series resonant converter is steady state value.
Accompanying drawing explanation
Fig. 1 is the basic system structure figure of a kind of high-frequency isolation type DC-DC of embodiment of the present invention dual stage power transformation system structure;
Fig. 2 is the circuit topological structure figure of a kind of high-frequency isolation type DC-DC of embodiment of the present invention dual stage power transformation system structure;
Fig. 3 is the front end three-level buck converter topology structure chart of a kind of high-frequency isolation type DC-DC of embodiment of the present invention dual stage power transformation system structure;
Fig. 4 is the topology diagram of the rear end series resonant converter of a kind of high-frequency isolation type DC-DC of embodiment of the present invention dual stage power transformation system structure.
Embodiment
In order to make objects and advantages of the present invention clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As Figure 1-4, embodiments provide a kind of high-frequency isolation type DC-DC dual stage power transformation system structure, comprise and being combined as a whole: three-level buck converter 1, can be connected with unipolarity or bipolarity DC bus, Main Function is for regulating overall output voltage and electric current; Series resonant converter 2, Main Function is the electrical isolation function realizing system; Described three-level buck converter 1 comprises three level power conversion modules 3 and LC low pass filter 4, and three level power conversion modules 3 is directly connected with LC low pass filter 4; Described series resonant converter 2 comprises full-bridge inverter 5 and high frequency transformer 6 and rectifier bridge 7, LC low pass filter right-hand member and is directly connected with full-bridge inverter 5, the mid point of full-bridge inverter 5 respectively with the leakage inductance L in high frequency transformer 6
rwith resonant capacitance C
rconnect, high frequency transformer 6 secondary side is connected with two brachium pontis mid points of rectifier bridge 7, control rectifier bridge 7 right-hand member Parallel opertation electric capacity of voltage regulation.
Described three level power conversion modules 3 is by two input electric capacity of voltage regulation C
s1, C
s2, two switching tube Q1, Q2 (insulated gate bipolar transistor IGBT or mos field effect transistor MOSFET etc.) and two fly-wheel diodes or switching tube (insulated gate bipolar transistor IGBT or mos field effect transistor MOSFET etc.) D
s1, D
s2form, upper brachium pontis switching tube Q1 and sustained diode
s1series connection then with input electric capacity of voltage regulation C
s1parallel connection, lower brachium pontis switching tube Q2 and sustained diode
s1with input electric capacity of voltage regulation C while of series connection
s2parallel connection, input electric capacity of voltage regulation C
s1, C
s2series connection, input electric capacity of voltage regulation C
s1upper end be input power positive pole T, input electric capacity of voltage regulation C
s2lower end be input power negative pole B, upper and lower two brachium pontis series connection, upper end and input power positive pole T-phase company, lower end is connected with input power negative pole B, the mid point of two brachium pontis and DC side electric capacity of voltage regulation C
s1, C
s2draw midpoint potential M to connect, the input side of three level power conversion modules 3 is provided with input port T, M, B, T, M, B tri-ports can be accessed three output ports of ambipolar DC bus, also can only by the output port of T, B two port access monopole type DC buss, three level power conversion modules (3) outlet side is directly connected with LC low pass filter 4.
Described LC low pass filter 4 is by 2 symmetrical filter inductance L
f1, L
f2and a filter capacitor C
fcomposition, filter inductance L
f1, L
f2with filter capacitor C
fseries connection, filter capacitor C
fat filter inductance L
f1, L
f2centre, from filter capacitor C
foutput port 1 and the port 2 of LC low pass filter are drawn in two ends; LC low pass filter 4 left end is connected with three level conversion module and forms three-level buck converter 1, LC low pass filter right-hand member exit 1 and hold 2 and be directly connected with full-bridge inverter 5 two brachium pontis two ends in parallel.
Described full-bridge inverter 5 comprises two brachium pontis, two brachium pontis parallel connections, one of them brachium pontis is by switching tube S1, S3 (insulated gate bipolar transistor IGBT or mos field effect transistor MOSFET etc.) diode D1, D3, and shunt capacitance C1, C3 are formed; Another brachium pontis by switching tube S2, S4, diode D2, D4, shunt capacitance C2, C4 are formed, and switching tube S1 and S3 connects, and switching tube S2 and S4 connects, the mid point of two brachium pontis respectively with the primary side leakage inductance L in high frequency transformer 6
rwith resonant capacitance C
rconnect.
Described high frequency transformer 6 is the equivalent structure of physical device, comprises primary side leakage inductance L
r, magnetizing inductance L
mand an ideal transformer, magnetizing inductance L
min parallel with ideal transformer thereafter and then with primary side leakage inductance L
rwith resonant capacitance C
rseries connection, two lead-out wires of described high frequency transformer secondary side are connected with two brachium pontis mid points in parallel of rectifier bridge 7 respectively.
Described rectifier bridge 7 is composed in parallel by front brachium pontis and rear brachium pontis, and front brachium pontis is by diode or switching tube (insulated gate bipolar transistor IGBT or mos field effect transistor MOSFET etc.) D
r1, D
r2in series, rear brachium pontis is by diode or switching tube (insulated gate bipolar transistor IGBT or mos field effect transistor MOSFET etc.) D
r3, D
r4in series, the mid point lead-out wire of front brachium pontis and rear brachium pontis exports with high frequency transformer secondary side and is connected, rectifier bridge 7 right-hand member Parallel opertation electric capacity of voltage regulation.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. a high-frequency isolation type DC-DC dual stage power transformation system structure, it is characterized in that, comprise the three-level buck converter (1) and series resonant converter (2) that are combined as a whole, described three-level buck converter (1) comprises three level power conversion modules (3) and LC low pass filter (4), and three level power conversion modules (3) is directly connected with LC low pass filter (4); Described series resonant converter (2) comprises full-bridge inverter (5) and high frequency transformer (6) and rectifier bridge (7), LC low pass filter right-hand member is directly connected with full-bridge inverter (5), the mid point of full-bridge inverter (5) respectively with the leakage inductance L in high frequency transformer (6)
rwith resonant capacitance C
rconnect, high frequency transformer (6) secondary side is connected with two brachium pontis mid points of rectifier bridge (7), rectifier bridge (7) right-hand member Parallel opertation electric capacity of voltage regulation.
2. high-frequency isolation type DC-DC dual stage power transformation system structure as claimed in claim 1, is characterized in that, described three level power conversion modules (3) is by two input electric capacity of voltage regulation C
s1, C
s2, two switching tubes Q1, Q2 and two fly-wheel diodes or switching tube D
s1, D
s2form, upper brachium pontis switching tube Q1 and fly-wheel diode or switching tube D
s1series connection then with input electric capacity of voltage regulation C
s1parallel connection, lower brachium pontis switching tube Q2 and fly-wheel diode or switching tube D
s1with input electric capacity of voltage regulation C while of series connection
s2parallel connection, input electric capacity of voltage regulation C
s1, C
s2series connection, input electric capacity of voltage regulation C
s1upper end be input power positive pole T, input electric capacity of voltage regulation C
s2lower end be input power negative pole B, upper and lower two brachium pontis series connection, upper end and input power positive pole T-phase company, lower end is connected with input power negative pole B, the mid point of two brachium pontis and DC side electric capacity of voltage regulation C
s1, C
s2draw midpoint potential M to connect, the input side of three level power conversion modules (3) is provided with input port T, M, B, and three level power conversion modules (3) outlet side is directly connected with LC low pass filter (4).
3. high-frequency isolation type DC-DC dual stage power transformation system structure as claimed in claim 1, is characterized in that, described LC low pass filter (4) is by 2 symmetrical filter inductance L
f1, L
f2and a filter capacitor C
fcomposition, filter inductance L
f1, L
f2with filter capacitor C
fseries connection, filter capacitor C
fat filter inductance L
f1, L
f2centre, from filter capacitor C
foutput port 1 and the port 2 of LC low pass filter are drawn in two ends; LC low pass filter (4) left end is connected with three level power conversion modules and forms three-level buck converter (1), and LC low pass filter right-hand member exit 1 is directly connected with full-bridge inverter (5) two brachium pontis two ends in parallel with end 2.
4. high-frequency isolation type twin-stage DC-DC power conversion system structure as claimed in claim 1, it is characterized in that, described full-bridge inverter (5) comprises two brachium pontis, two brachium pontis parallel connections, one of them brachium pontis by switching tube S1, S3, diode D1, D3, shunt capacitance C1, C3 form; Another brachium pontis by switching tube S2, S4, diode D2, D4, shunt capacitance C2, C4 are formed, and switching tube S1 and S3 connects, and switching tube S2 and S4 connects, the mid point of two brachium pontis respectively with the primary side leakage inductance L in high frequency transformer (6)
rwith resonant capacitance C
rconnect.
5. high-frequency isolation type twin-stage DC-DC power conversion system structure as claimed in claim 1, it is characterized in that, the equivalent structure that described high frequency transformer (6) is physical device, comprises primary side leakage inductance L
r, magnetizing inductance L
mand an ideal transformer, magnetizing inductance L
min parallel with ideal transformer thereafter and then with primary side leakage inductance L
rwith resonant capacitance C
rseries connection, two lead-out wires of described high frequency transformer secondary side are connected with two brachium pontis mid points in parallel of rectifier bridge (7) respectively.
6. high-frequency isolation type twin-stage DC-DC power conversion system structure as claimed in claim 1, it is characterized in that, described rectifier bridge (7) is composed in parallel by front brachium pontis and rear brachium pontis, and front brachium pontis is by diode or switching tube D
r1, D
r2in series, rear brachium pontis is by diode or switching tube D
r3, D
r4in series, the mid point lead-out wire of front brachium pontis and rear brachium pontis exports with high frequency transformer secondary side and is connected, rectifier bridge (7) right-hand member Parallel opertation electric capacity of voltage regulation.
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| CN110768531A (en) * | 2018-07-27 | 2020-02-07 | 株洲中车时代电气股份有限公司 | Bidirectional high-frequency isolation type DC/DC module |
| CN111030484A (en) * | 2020-01-02 | 2020-04-17 | 阳光电源股份有限公司 | Inversion system |
| WO2020114758A1 (en) * | 2018-12-05 | 2020-06-11 | Phoenix Contact Gmbh & Co. Kg | Switched-mode power supply having coupled step-down converter stages |
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| CN111697656A (en) * | 2020-06-20 | 2020-09-22 | 复旦大学 | Series resonance charging device based on bipolar Marx circuit |
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