CN105897004A - Power electronic transformer topology structure for self-balancing of multi-level DC bus - Google Patents
Power electronic transformer topology structure for self-balancing of multi-level DC bus Download PDFInfo
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- CN105897004A CN105897004A CN201610343961.1A CN201610343961A CN105897004A CN 105897004 A CN105897004 A CN 105897004A CN 201610343961 A CN201610343961 A CN 201610343961A CN 105897004 A CN105897004 A CN 105897004A
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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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
- 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
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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
- 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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The invention relates to a power electronic transformer topology structure for self-balancing of a multi-level DC bus. The power electronic transformer topology structure is characterized by comprising a high-voltage rectifier circuit, a DC/DC conversion circuit and a low-voltage DC/AC inverter circuit, wherein an input end of the high-voltage rectifier circuit is connected with a high-voltage three-phase AC power network; an output end of the high-voltage rectifier circuit is connected with one end of the DC/DC conversion circuit through a high-voltage DC bus; the other end of the DC/DC conversion circuit is connected with the input end of the low-voltage DC/AC inverter circuit; and the output end of the low-voltage DC/AC inverter circuit is connected with a low-voltage three-phase AC power network. By the topology structure, capacitance-voltage balancing is carried out without voltage feedback of a DC bus capacitor; and the control algorithm of a rectifier side is greatly simplified.
Description
Technical field
The present invention relates to a kind of electric power electric transformer topological structure, especially with regard to a kind of Power Electronic Technique neck
The electric power electric transformer topological structure of the many level DCs bus self-balancing in territory.
Background technology
Electric power electric transformer (Power Electronic Transformer, PET) passes as a kind of new electric energy
Transfer device, has the advantage that 1 relative to traditional power transformer, volume is greatly reduced with weight.2, may be used
To realize the ac-dc conversion of any amplitude and frequency, first and second side voltage current waveform is controlled, power factor
Adjustable.3, reactive-load compensation and defencive function are carried, it is not necessary to extra corollary apparatus.
Now for full-controlled device many employings Si based insulation grid bipolar transistor (Insulated Gate of PET
Bipolar Transistor, IGBT), but due to the restriction of Si base IGBT voltage Yu power grade, it is difficult to full
The requirement of foot power distribution network medium voltage side electric pressure.In the three-phase distribution net PET topology proposed at present, use more
The form of multi-level converter, thus reduces the voltage stress that individual devices bears, it is easy to accomplish high-voltage large-capacity,
Under same switch frequency, the voltage current waveform of output is closer to sine simultaneously, and harmonic content is low.
The topology of diode clamp formula as most frequently with many level topology, but DC capacitor voltage is uneven
Weighing apparatus is the subject matter on it controls.In the case of transmission is meritorious, circuit needs to carry out capacitive balance control,
This makes the control algolithm of circuit become complex along with the increase of level number.Open up currently for diode clamp
The algorithm research flutterring DC bus capacitor balance is more, but majority can only realize capacitor voltage equalizing control to three-level topology,
Five level topologys are realized the most under given conditions, when level number increases further, DC capacitor voltage
The control of balance will be difficult to.
Summary of the invention
For the problems referred to above, it is an object of the invention to provide the power electronics of a kind of many level DCs bus self-balancing
Converter topology, this topological structure need not the Voltage Feedback of dc-link capacitance and carries out capacitance voltage equilibrium,
The control algolithm of rectification side is greatly simplified.
For achieving the above object, the present invention takes techniques below scheme: a kind of many level DCs bus self-balancing
Electric power electric transformer topological structure, it is characterised in that: it include high-voltage rectifier, DC/DC translation circuit and
Low voltage DC/AC inverter circuit；The input of described high-voltage rectifier is connected with high pressure three-phase alternating current electrical network, institute
The outfan stating high-voltage rectifier is connected with described DC/DC translation circuit one end through high voltage dc bus, described
The DC/DC translation circuit other end is connected with described low voltage DC/AC inverter circuit input, described low voltage DC/AC
Inverter circuit outfan is connected with low-voltage three-phase AC electrical network.
Preferably, described high-voltage rectifier includes that the many level of diode clamp formula of A, B, C parallel three phase are whole
Current circuit, mutually the most described diode clamp formula multi-level rectifying circuit input end is all with high pressure three-phase alternating current electrical network even
Connecing, mutually the most described diode clamp formula multi-level rectifying circuit output end is connected to described high voltage dc bus；Institute
State high voltage dc bus by 2n-2 dc-link capacitance C1、C2、…、C2n-2Cascade forms.
Preferably, the number of levels of mutually the most described diode clamp formula multi-level rectifying circuit is according on high-tension side electricity
The pressure grade of IGBT device of pressure grade and use is adjusted.
Preferably, described DC/DC translation circuit includes 2n-2 high-frequency inversion H bridge submodule HBh, medium-high frequency
Transformator and 2n-2 high-frequency rectification H bridge submodule HBl, n is natural number；Described 2n-2 high-frequency inversion H
Bridge submodule HBhInput connects described high voltage dc bus, and outfan connects described medium/high frequency transformer respectively
2n-2 input port, 2n-2 output port of described medium/high frequency transformer connects described 2n-2 high frequency respectively
Rectification H bridge submodule HBlInput；Described 2n-2 high-frequency rectification H bridge submodule HBlConnect after outfan parallel connection
It is connected to described low voltage DC/AC inverter circuit.
Preferably, described high-frequency inversion H bridge submodule HBhQuantity and described high voltage dc bus in dc bus
Electric capacity quantity is consistent, and each described high-frequency inversion H bridge submodule HBhAll corresponding with dc-link capacitance connection.
Preferably, described medium/high frequency transformer uses k to input m export structure, k=2n-2；Described medium-high frequency becomes
M output port of depressor connects m described high-frequency rectification H bridge submodule HB respectivelyl, described m high-frequency rectification
H bridge submodule HBlOutfan parallel connection forms single low-voltage direct bus.
Preferably, described medium/high frequency transformer uses k to input m export structure, k=2n-2；Described medium-high frequency becomes
M output port of depressor connects m described high-frequency rectification H bridge submodule HB respectivelyl, described m high-frequency rectification
H bridge submodule HBlOutfan parallel connection forms three discrete low-voltage direct buses.
Preferably, described medium/high frequency transformer uses single-input single-output structure, described medium/high frequency transformer output port
Connect described 2n-2 high-frequency rectification H bridge submodule HBl, described 2n-2 high-frequency rectification H bridge submodule HBl
Outfan is finally in parallel forms single low-voltage direct bus.
Preferably, described low voltage DC/AC inverter circuit uses the inverter circuit of three-phase, and described DC/DC converts electricity
Road outfan parallel connection forms single low-voltage direct bus, and described inverter circuit is three-phase inversion topological, described three-phase
Inversion topological uses diode clamping tri-level three-phase inverting circuit or uses simple three-phase H bridge inversion topological.
Preferably, described low voltage DC/AC inverter circuit uses the single-phase inversion circuit of three star-like connections, described
DC/DC translation circuit outfan parallel connection forms three discrete low-voltage direct buses, and described single-phase inversion circuit uses
Three single-phase H bridges are topological or single-phase multi-level inverter circuit.
Due to the fact that and take above technical scheme, it has the advantage that the electric power electric transformer of the present invention
Topology uses the many level block of diode clamp formula in high-pressure side, for the high voltage dc bus electricity of rectification side cascade
The voltage-sharing held, is used the mode of rear class hardware clamp, is connected to the H of each dc-link capacitance by control
Bridge so that the diode clamp formula multi-level circuit of rectification stage need not the Voltage Feedback of dc-link capacitance to be carried out
Capacitance voltage equalizes, and the control algolithm of rectification side is greatly simplified.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention；
Fig. 2 is the high-pressure side rectification circuit schematic diagram of the present invention；
Fig. 3 is the first DC/DC translation circuit internal structure schematic diagram of the present invention；
Fig. 4 is the second DC/DC translation circuit internal structure schematic diagram of the present invention；
Fig. 5 is the third DC/DC translation circuit internal structure schematic diagram of the present invention；
Fig. 6 is the first DC/AC translation circuit structural representation of the present invention；
Fig. 7 is the second DC/AC translation circuit structural representation of the present invention.
Detailed description of the invention
With embodiment, the present invention is described in detail below in conjunction with the accompanying drawings.
As it is shown in figure 1, the present invention provides the electric power electric transformer topology of a kind of many level DCs bus self-balancing
Structure, it includes high-voltage rectifier, DC/DC translation circuit and low voltage DC/AC inverter circuit.High-voltage rectifying electricity
The input on road is connected with high pressure three-phase alternating current electrical network, the outfan of high-voltage rectifier through high voltage dc bus with
DC/DC translation circuit one end connects, and the DC/DC translation circuit other end is with low voltage DC/AC inverter circuit input even
Connecing, low voltage DC/AC inverter circuit outfan is connected with low-voltage three-phase AC electrical network.
In above-described embodiment, as in figure 2 it is shown, high-voltage rectifier includes the diode of A, B, C parallel three phase
Clamped multi-level rectification circuit, every diode phase clamped multi-level rectifier circuit structure is identical, only with wherein A
As a example by phase cascaded H-bridges topology, high-voltage rectifier is described in detail.A diode phase clamped multi-level rectification
Circuit input end is connected with high pressure three-phase alternating current electrical network A commutating phase input, and A diode phase clamped multi-level is whole
Current circuit outfan is connected to high voltage dc bus.High voltage dc bus is by 2n-2 dc-link capacitance C1、
C2、…、C2n-2Cascade forms.Wherein, the number of levels of every diode phase clamped multi-level rectification circuit according to
The pressure grade of IGBT device of on high-tension side electric pressure and use is adjusted.
In the various embodiments described above, as it is shown on figure 3, DC/DC translation circuit includes 2n-2 high-frequency inversion H bridge
Module HBh, medium/high frequency transformer and 2n-2 high-frequency rectification H bridge submodule HBl, n is natural number.2n-2
High-frequency inversion H bridge submodule HBhInput connects high voltage dc bus, and outfan connects medium/high frequency transformer respectively
2n-2 input port, 2n-2 output port of medium/high frequency transformer connects 2n-2 high-frequency rectification H respectively
Bridge submodule HBlInput.2n-2 high-frequency rectification H bridge submodule HBlIt is connected to low pressure after outfan parallel connection
DC/AC inverter circuit.Wherein, high-frequency inversion H bridge submodule HBhQuantity and high voltage dc bus in direct current female
Line capacitance quantity is consistent, and each high-frequency inversion H bridge submodule HBhAll corresponding with dc-link capacitance connection.
Medium/high frequency transformer can use various structures, in the present embodiment, as it is shown on figure 3, medium-high frequency transformation
Device can also use k to input m export structure, now, k=2n-2；The each input port of medium/high frequency transformer is respectively
Connect each high-frequency inversion H bridge submodule HBh, it is whole that m output port of medium/high frequency transformer connects m high frequency respectively
Stream H bridge submodule HBl, m high-frequency rectification H bridge submodule HBlOutfan is finally in parallel forms single low-pressure direct
Stream bus；Or m output port of medium/high frequency transformer connects m high-frequency rectification H bridge submodule HB respectivelyl, m
Individual high-frequency rectification H bridge submodule HBlOutfan is finally in parallel forms three discrete low-voltage direct buses (such as Fig. 4
Shown in).As it is shown in figure 5, medium/high frequency transformer can use single-input single-output structure, now, medium/high frequency transformer
Output port connects 2n-2 high-frequency rectification H bridge submodule HBl, 2n-2 high-frequency rectification H bridge submodule HBl
Outfan is finally in parallel forms single low-voltage direct bus.
In the various embodiments described above, low voltage DC/AC inverter circuit can use the inverter circuit of three-phase, it is also possible to adopts
With the single-phase inversion circuit of three star-like connections.When DC/DC translation circuit outfan parallel connection forms single low-pressure direct
During stream bus, low voltage DC/AC inverter circuit uses the inverter circuit of three-phase, and now, inverter circuit is three contraries
Variable topological (as shown in Figure 6), three-phase inversion topological can use diode clamping tri-level three-phase inverting circuit or
Use the three-phase H bridge inversion topological that other three-phase multi-level inverse conversion is topological or simple.When DC/DC translation circuit
When outfan parallel connection forms three discrete low-voltage direct buses, low voltage DC/AC inverter circuit employing three is star-like
The single-phase inversion circuit connected, single-phase inversion circuit uses three single-phase H bridges topology (as shown in Figure 7), or
Single-phase multi-level inverter circuit such as diode clamp inverter circuit.
In sum, for the high voltage dc bus electric capacity of cascade, can be by the high-frequency inversion H bridge of following stage
Submodule HBhIts voltage is carried out Balance route.By controlling high-frequency inversion H bridge submodule HBhBetween phase place
Difference can control the flow of power between H bridge, thus reaches the mesh of cascade high voltage dc-link capacitance electric voltage equalization
's.Thus, the high voltage dc bus capacitance voltage equilibrium of cascade connects medium/high frequency transformer by controlling rear class
High-frequency inversion H bridge submodule HBhRealize, and for the diode clamp multi-level rectifying circuit of rectification side, the most not
Need in the control algolithm of rectification side, carry out cascading capacitive balance to control, general voltage, current double closed-loop SPWM
Or the current phase of high-pressure side cascade dc-link capacitance voltage and input can be controlled by SVPWM algorithm,
Enormously simplify the complexity of front-end rectification stage control algolithm, beneficially the lifting of multi-level circuit level number, makes
The diode clamp multi-level circuit obtaining more than seven level is carried out actual application.
The various embodiments described above are merely to illustrate the present invention, the structure of each parts, size, arrange position and shape all
Can be varied from, on the basis of technical solution of the present invention, all according to the principle of the invention to individual part
The improvement carried out and equivalents, the most should not get rid of outside protection scope of the present invention.
Claims (10)
1. the electric power electric transformer topological structure of the self-balancing of level DC bus more than a kind, it is characterised in that: it
Including high-voltage rectifier, DC/DC translation circuit and low voltage DC/AC inverter circuit；Described high-voltage rectifier
Input is connected with high pressure three-phase alternating current electrical network, the outfan of described high-voltage rectifier through high voltage dc bus with
Described DC/DC translation circuit one end connects, and the described DC/DC translation circuit other end is inverse with described low voltage DC/AC
Becoming circuit input end to connect, described low voltage DC/AC inverter circuit outfan is connected with low-voltage three-phase AC electrical network.
The electric power electric transformer topology knot of a kind of many level DCs bus self-balancing the most as claimed in claim 1
Structure, it is characterised in that: described high-voltage rectifier includes that how electric the diode clamp formula of A, B, C parallel three phase is
Smooth current circuit, mutually the most described diode clamp formula multi-level rectifying circuit input end all with high pressure three-phase alternating current
Net connects, and mutually the most described diode clamp formula multi-level rectifying circuit output end is connected to described high voltage dc bus；
Described high voltage dc bus is by 2n-2 dc-link capacitance C1、C2、…、C2n-2Cascade forms.
The electric power electric transformer topology knot of a kind of many level DCs bus self-balancing the most as claimed in claim 2
Structure, it is characterised in that: the number of levels of every mutually described diode clamp formula multi-level rectifying circuit is according to high-pressure side
Electric pressure and the pressure grade of IGBT device of use be adjusted.
The electric power electric transformer topology knot of a kind of many level DCs bus self-balancing the most as claimed in claim 1
Structure, it is characterised in that: described DC/DC translation circuit includes 2n-2 high-frequency inversion H bridge submodule HBhIn,
High frequency transformer and 2n-2 high-frequency rectification H bridge submodule HBl, n is natural number；Described 2n-2 high frequency is inverse
Become H bridge submodule HBhInput connects described high voltage dc bus, and outfan connects described medium-high frequency transformation respectively
2n-2 input port of device, 2n-2 output port of described medium/high frequency transformer connects described 2n-2 respectively
High-frequency rectification H bridge submodule HBlInput；Described 2n-2 high-frequency rectification H bridge submodule HBlOutfan is in parallel
After be connected to described low voltage DC/AC inverter circuit.
The electric power electric transformer topology knot of a kind of many level DCs bus self-balancing the most as claimed in claim 4
Structure, it is characterised in that: described high-frequency inversion H bridge submodule HBhQuantity and described high voltage dc bus in direct current
Bus capacitor quantity is consistent, and each described high-frequency inversion H bridge submodule HBhAll corresponding with a dc-link capacitance
Connect.
The electric power electric transformer topology knot of a kind of many level DCs bus self-balancing the most as claimed in claim 4
Structure, it is characterised in that: described medium/high frequency transformer uses k to input m export structure, k=2n-2；Described middle height
M output port of frequency power transformer connects m described high-frequency rectification H bridge submodule HB respectivelyl, described m high frequency
Rectification H bridge submodule HBlOutfan parallel connection forms single low-voltage direct bus.
The electric power electric transformer topology knot of a kind of many level DCs bus self-balancing the most as claimed in claim 4
Structure, it is characterised in that: described medium/high frequency transformer uses k to input m export structure, k=2n-2；Described middle height
M output port of frequency power transformer connects m described high-frequency rectification H bridge submodule HB respectivelyl, described m high frequency
Rectification H bridge submodule HBlOutfan parallel connection forms three discrete low-voltage direct buses.
The electric power electric transformer topology knot of a kind of many level DCs bus self-balancing the most as claimed in claim 4
Structure, it is characterised in that: described medium/high frequency transformer uses single-input single-output structure, and described medium/high frequency transformer exports
Port connects described 2n-2 high-frequency rectification H bridge submodule HBl, described 2n-2 high-frequency rectification H bridge submodule
HBlOutfan is finally in parallel forms single low-voltage direct bus.
The electric power electric transformer topology knot of a kind of many level DCs bus self-balancing the most as claimed in claim 1
Structure, it is characterised in that: described low voltage DC/AC inverter circuit uses the inverter circuit of three-phase, and described DC/DC becomes
Changing circuit output end parallel connection and form single low-voltage direct bus, described inverter circuit is three-phase inversion topological, described
Three-phase inversion topological uses diode clamping tri-level three-phase inverting circuit or uses simple three-phase H bridge inversion to open up
Flutter.
The electric power electric transformer topology of a kind of many level DCs bus self-balancing the most as claimed in claim 1
Structure, it is characterised in that: described low voltage DC/AC inverter circuit uses the single-phase inversion circuit of three star-like connections,
Described DC/DC translation circuit outfan parallel connection forms three discrete low-voltage direct buses, described single-phase inversion electricity
Road uses three single-phase H bridges topological or single-phase multi-level inverter circuit.
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Cited By (4)
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| CN108322078A (en) * | 2018-05-03 | 2018-07-24 | 易事特集团股份有限公司 | Five level topology units and five level AC/DC convertors |
| CN109120157A (en) * | 2018-10-09 | 2019-01-01 | 特变电工新疆新能源股份有限公司 | A kind of three-port DC electric power electric transformer |
| CN109217314A (en) * | 2018-11-13 | 2019-01-15 | 中国铁道科学研究院集团有限公司 | A kind of alternating current-direct current mixed support power supply system |
| CN112436779A (en) * | 2020-10-21 | 2021-03-02 | 华为技术有限公司 | Electric drive system, power assembly and electric automobile |
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| CN115589139A (en) | 2021-07-05 | 2023-01-10 | 台达电子企业管理（上海）有限公司 | Power supply conversion device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108322078A (en) * | 2018-05-03 | 2018-07-24 | 易事特集团股份有限公司 | Five level topology units and five level AC/DC convertors |
| CN108322078B (en) * | 2018-05-03 | 2023-10-03 | 易事特集团股份有限公司 | Five-level topological unit and five-level alternating-current-direct-current converter |
| CN109120157A (en) * | 2018-10-09 | 2019-01-01 | 特变电工新疆新能源股份有限公司 | A kind of three-port DC electric power electric transformer |
| CN109217314A (en) * | 2018-11-13 | 2019-01-15 | 中国铁道科学研究院集团有限公司 | A kind of alternating current-direct current mixed support power supply system |
| CN112436779A (en) * | 2020-10-21 | 2021-03-02 | 华为技术有限公司 | Electric drive system, power assembly and electric automobile |
| WO2022083219A1 (en) * | 2020-10-21 | 2022-04-28 | 华为数字能源技术有限公司 | Electric drive system, power assembly, and electric vehicle |
| EP4016837A4 (en) * | 2020-10-21 | 2022-11-16 | Huawei Digital Power Technologies Co., Ltd. | Electric drive system, power assembly, and electric vehicle |
| US11518246B2 (en) | 2020-10-21 | 2022-12-06 | Huawei Digital Power Technologies Co., Ltd. | Electric drive system, powertrain, and electric vehicle |
| CN112436779B (en) * | 2020-10-21 | 2024-05-14 | 华为数字能源技术有限公司 | Electric drive system, power assembly and electric automobile |
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