CN112737393A - Voltage conversion device method for electric automobile and electric drive system - Google Patents
Voltage conversion device method for electric automobile and electric drive system Download PDFInfo
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- CN112737393A CN112737393A CN202110094483.6A CN202110094483A CN112737393A CN 112737393 A CN112737393 A CN 112737393A CN 202110094483 A CN202110094483 A CN 202110094483A CN 112737393 A CN112737393 A CN 112737393A
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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
- H02M7/53—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
- H02M7/53871—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 with automatic control of output voltage or current
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
- B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The present invention relates to a voltage conversion apparatus for an electric vehicle, which includes: the system comprises an inverter unit, a first control unit and a second control unit, wherein the inverter unit comprises three batches of a plurality of switch assemblies used for providing three-phase current required by a motor of the electric automobile, and a first input end and a second input end; a third input terminal configurably connected to a three-phase output terminal of the inverter unit; wherein the inverter unit is configured to: the second direct-current voltage input via the third input terminal and the second input terminal is converted into the first direct-current voltage to provide the first direct-current voltage between the first input terminal and the second input terminal. The voltage conversion device saves the charging cost of the electric automobile, improves the economical efficiency of the whole automobile manufacturing, reduces the weight of the whole automobile and is beneficial to optimizing the layout of the whole automobile.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a voltage conversion device for an electric automobile.
Background
At present, the platforms of the mainstream electric automobile high-voltage systems in the market are all 400V. For higher efficiency and more convenient charging experience, the next generation electric vehicle high voltage system platform gradually transits from 400V to 800V.
For a power battery, when switching from 400V to 800V platform, in order to be compatible with a 400V charging device, a conventional solution is to add a primary step-up dc/dc transformer, when a 400V dc charging pile is connected to charge, the voltage of the charging pile is not directly applied to the power battery, but the high-power dc/dc transformer is used to raise the voltage to 800V and then charge the power battery, but the solution has the following disadvantages: firstly, the 400V-to-800V direct current/direct current transformer has large power and high monomer cost, thereby improving the cost of the whole vehicle; secondly, the transformer is large in size and weight, and is not beneficial to layout and light weight of the whole vehicle.
Disclosure of Invention
According to an aspect of the present invention, there is provided a voltage conversion apparatus for an electric vehicle, including: the system comprises an inverter unit, a first control unit and a second control unit, wherein the inverter unit comprises three batches of a plurality of switch assemblies used for providing three-phase current required by a motor of the electric automobile, and a first input end and a second input end; a third input terminal configurably connected to a three-phase output terminal of the inverter unit; wherein the inverter unit is configured to: the second direct-current voltage input via the third input terminal and the second input terminal is converted into the first direct-current voltage to provide the first direct-current voltage between the first input terminal and the second input terminal.
Optionally, the voltage conversion apparatus further includes: a first switch group configured to couple three-phase output terminals of the inverter unit with three windings of the motor, respectively; and a second switch group configured to couple the third input terminals with the three-phase output terminals of the inverter unit, respectively.
Optionally, each of the three pluralities of switch assemblies respectively includes a first switch assembly, a second switch assembly, a third switch assembly and a fourth switch assembly connected in series with each other, and each switch assembly is formed by connecting a triode and a diode in parallel.
Optionally, the system further comprises a plurality of switching elements, wherein a first switching element is coupled to the first input; the fourth switching component is coupled to the second input; the junction of the second switching component and the third switching component is coupled to one phase output of the inverter unit.
Optionally, for each batch of switching assemblies, wherein the output of the first switching assembly is coupled to the input of the fourth switching assembly via a capacitor.
According to another aspect of the present invention, there is provided an electric drive system comprising a voltage conversion device as described above.
According to still another aspect of the present invention, there is provided a charging and driving system for an electric vehicle, including: a battery; one or more accessories; the electric drive system as described above; and a plurality of switch controls configured to perform on-off control between the charging port and the electric drive system to: providing a first direct current voltage to the battery and the accessory when the first direct current voltage is input to the charging port; when the second DC voltage is input to the charging port, the second DC voltage is boosted to the first DC voltage via the electric drive system for provision to the battery and the accessory.
The voltage conversion device provided by the invention does not need a complex direct current/direct current converter, and can be compatible with two direct current charging devices of 400V and 800V directly through the inverter unit and different direct current voltage input ends, so that the charging cost of the electric automobile is saved, the economy of the whole automobile manufacturing is improved, the weight of the whole automobile is reduced, and the whole automobile layout is favorably optimized.
Drawings
Fig. 1 shows a circuit of a voltage conversion apparatus for an electric vehicle according to an embodiment of the present invention.
Fig. 2 shows the connection state of the circuit of fig. 1 when the electric vehicle is connected into the 800V charging pile.
Fig. 3 shows the connection state of the circuit of fig. 1 when the electric vehicle is connected into a 400V charging pile.
Detailed Description
In the following description specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that embodiments of the invention may be practiced without these specific details. In the present invention, specific numerical references such as "first element", "second device", and the like may be made. However, specific numerical references should not be construed as necessarily subject to their literal order, but rather construed as "first element" as opposed to "second element".
The specific details set forth herein are merely exemplary and may be varied while remaining within the spirit and scope of the invention. The term "coupled" is defined to mean either directly connected to a component or indirectly connected to the component via another component.
Preferred embodiments of methods, systems and devices suitable for implementing the present invention are described below with reference to the accompanying drawings. Although embodiments are described with respect to a single combination of elements, it is to be understood that the invention includes all possible combinations of the disclosed elements. Thus, if one embodiment includes elements A, B and C, while a second embodiment includes elements B and D, the invention should also be considered to include A, B, C or the other remaining combinations of D, even if not explicitly disclosed.
One embodiment of the present invention provides a voltage conversion apparatus for an electric vehicle, which includes an inverter unit and a third input terminal external to the inverter unit. The inverter unit includes three batches of a plurality of switching assemblies for supplying three-phase currents required for a motor of an electric vehicle, and a first input terminal T1 and a second input terminal T2. Third input terminal T3 of the voltage conversion device and three-phase output terminal of the inverter unitA. B, C are configurably connected. Three input ends can be used for receiving direct current voltage input, and three-phase current I required by the motor can be output through the inversion operation of the inverter unitA、IB、IC。
As shown in fig. 1, the inverter unit specifically includes a first plurality of switching assemblies: triodes Q11, Q12, Q13 and Q14, and diodes D11, D12, D13 and D14. The triodes and the diodes are connected in parallel two by two. For the first switching elements, transistor Q11 and diode D11 are connected in parallel to form the first switching element. A transistor Q12 and a diode D12 are connected in parallel to form a second switching element. And the transistor Q13 and the diode D13 are connected in parallel to form a third switching component. And the transistor Q14 and the diode D14 are connected in parallel to form a fourth switch component. The first switch assembly, the second switch assembly, the third switch assembly and the fourth switch assembly are sequentially connected in series.
Similarly, the inverter unit further comprises a second plurality of switching assemblies: triodes Q21, Q22, Q23 and Q24, and diodes D21, D22, D23 and D24. For the second plurality of switching elements, transistor Q21 and diode D21 are connected in parallel to form the first switching element. A transistor Q22 and a diode D22 are connected in parallel to form a second switching element, and so on. Similarly, the first, second, third and fourth switch assemblies are connected in series in sequence. In the third plurality of switch assemblies (transistors Q31, Q32, Q33, Q34, diodes D31, D32, D33, D34), transistor Q31 and diode D31 are connected in parallel to form a first switch assembly. A transistor Q32 and a diode D32 are connected in parallel to form a second switching element, and so on. The inverter unit can convert an input direct current voltage into a three-phase current for driving the motor by on-off control of the first, second and third plurality of switch assemblies.
In some embodiments of the present invention, the three-phase output A, B, C of the inverter unit is connected to the third input T3 in a configurable manner. Thus, the third input T3 may be selectively connected with one or more of the three-phase outputs A, B, C. As an example, such a configurable connection may be achieved via the second switch group S1, S2.
Specifically, the voltage conversion apparatus further includes a first switch group K1 and second switch groups S1, S2. The three-phase output A, B, C of the inverter unit is coupled to three windings L1, L2 and L3 of the electric motor of the electric vehicle via a switch group K1, respectively, so that the electric motor can obtain three-phase currents required for operation. The third input T3 of the voltage conversion device is coupled to the three-phase output of the inverter unit via the switch groups S1, S2. The first and third switch groups may be implemented by electrically controlled switches. The first switch group K1 and the second switch groups S1, S2 may be on-off controlled by electrically controlled switches, diodes, or the like. In other embodiments, rather than using switch sets, selectors are used to connect the three-phase output A, B, C of the inverter to the three windings L1, L2, L3 of the motor or the third input T3 of the voltage conversion device.
Specifically, the first input T1 and the second input T2 of the inverter unit may be configured to receive a 800V dc high voltage input, the first input T1 being a positive pole, the second input T2 may be coupled to ground, the third input T3 of the voltage conversion device may be configured to receive a 400V dc voltage input, which is configurably connected to the three-phase output A, B, C of the inverter unit via two switches S1, S2, wherein the switch S1 is coupled between the three-phase outputs a and B, and the switch S2 is coupled between the three-phase outputs B and C. When 800V dc voltage is applied, the first and second input terminals T1, T2 are used as input terminals, and when 400V dc voltage is applied, the third and second input terminals T3, T2 are used as input terminals, and the first and second input terminals T1, T2 are used as output terminals.
Through the switch group or the selector, the inverter unit may not only directly supply the first dc voltage input between the first input terminal T1 and the second input terminal T2 to the high voltage bus to charge the battery while supplying power to other high voltage accessories (such as an air conditioning system, a lighting system, etc.), but more importantly, the inverter unit may also be configured to convert the second dc voltage input between the third input terminal T3 and the second input terminal T2 into the first dc voltage to supply the first dc voltage between the first input terminal T1 and the second input terminal T2, so that the first dc voltage may be obtained by the high voltage bus. The first direct current voltage may be 800V and the second direct current voltage 400V. Thus, the electric vehicle can be compatible with two different charging apparatuses, 400V and 800V.
According to some embodiments of the present invention, when the electric vehicle is connected to the 800V charging pile, the switches S1 and S2 are opened, and the first switch group K1 is entirely closed, as shown in fig. 2, at this time, the Electric Drive System (EDS) including the voltage conversion device is operated in the 800V charging mode (i.e., the conventional parking mode), the transistors of the inverter unit are all in the off state, and the inverter unit is actually deactivated.
When the voltage of the external charging pile is 400V, 400V dc is connected to the EDS through two ports of the third input terminal T3 and the second input terminal T2, the switches S1 and S2 are closed, and the switch group K1 is opened, as shown in fig. 3, at this time, the EDS operates in a 400V charging mode, the transistors (Q11, Q21, Q31) in each first switch assembly shown in the upper half of fig. 3, the transistors (Q12, Q22, Q32) in each second switch assembly are in a cut-off state and are deactivated, the transistors (Q13, Q23, Q33) in each third switch assembly and the transistors (Q14, Q24, Q34) in the fourth switch assembly are in an amplification state, and dc provided by the external charging pile 400V is boosted to 800V through the inverter unit and then connected to the high-voltage bus.
In some embodiments of the present invention, a control unit (not shown) may provide a turn-on voltage to the base of each transistor of the inverter unit to match the 400V charging and the 800V charging. The control unit may use a time division multiplexing technique to provide different turn-on voltages at different stages, for example, to match a 400V external charging post, the control unit outputs the turn-on voltages to the transistors Q13, Q23, Q33, Q14, Q24, Q34 to operate them in an amplification state, and at the same time, the control unit stops providing the turn-on voltages to the transistors Q11, Q21, Q31, Q12, Q22, Q32. In some embodiments of the present invention, each triode may be a high frequency SiC device, and when the inverter unit is used as a switched capacitor DC/DC converter, the switching frequency may be appropriately increased, and the ripple current of the input and output terminals may be reduced, so as to correspondingly reduce the sizes of the input and output bus capacitors and the switched capacitor
When the electric drive system EDS is in a drive mode, the switches S1 and S2 and the switch group K1 are all open, and the power battery provides 800V direct current to power all high-voltage devices including the EDS and the automobile air-conditioning accessories.
With continued reference to the specific example of fig. 1, for each of the first, second, and third pluralities of switch assemblies, the first switch assembly is coupled to the first input T1 and the fourth switch assembly is coupled to the second input T2. Specifically, taking the second plurality of switching elements as an example, the second plurality of switching elements are serially connected in series by 4 NPN transistors, wherein the collector of the transistor Q21 and the cathode of the parallel diode D21 are commonly coupled to the first input terminal T1, and the emitter of the transistor Q24 and the anode of the parallel diode D24 are commonly coupled to the second input terminal T2. Further, a connection point between the second switching component (constituted by the transistor Q22 and the diode D22 connected in parallel) and the third switching component (constituted by the transistor Q23 and the diode D23 connected in parallel) is coupled to the phase output terminal B of the inverter unit. Similarly, a connection point between the second switching component (Q12, D12 configured in parallel) and the third switching component (Q13, D13 configured in parallel) of the first plurality of switching components is coupled to the other phase output C of the inverter unit, and a connection point between the second switching component (Q32, D32 configured in parallel) and the third switching component (Q33, D33 configured in parallel) of the third plurality of switching components is coupled to the other phase output a of the inverter unit.
In some embodiments of the invention, the inverter unit further comprises some capacitors. As an example, for the first plurality of switching components, a first capacitor C1 may be coupled between the output of the first switching component (Q11, D11) and the input of the fourth switching component (Q14, D14) to maintain a continuous current. Similarly, for the second plurality of switching assemblies, a second capacitor C2 is coupled between the output of the first switching assembly (Q21, D21) and the input of the fourth switching assembly (Q24, D24); for the third plurality of switching assemblies, a third capacitor C3 is coupled between the output of the first switching assembly (Q31, D31) and the input of the fourth switching assembly (Q34, D34). In addition, as flying capacitors, the first, second and third capacitors C1, C2 and C3 are used as switching capacitors for dc/dc conversion, and can be staggered at a certain angle in control, so that current ripples at the input and output ends can be significantly reduced, which correspondingly reduces the size of the bus capacitor. When the inverter unit is used as a switched capacitor DC/DC converter, the switched capacitor can be connected with the resonant inductor in series, so that the current waveform flowing through the switching tube is sinusoidal, and the soft switching of the switching tube can be realized, which is beneficial to improving the system efficiency and improving the EMI performance.
In some embodiments of the present invention, the three windings L1, L2 and L3 of the motor may be connected in Y-shape or delta-shape, but the motor winding is no longer used as an energy storage inductor in the conventional dc/dc conversion, so that no current flows through the motor winding, and there is no electromagnetic torque, and therefore there is no problem of mechanical vibration and NVH (i.e., noise, vibration and harshness) when the EDS is in a charging state.
Some embodiments of the present invention also provide an electric drive system EDS, as part of which the voltage conversion device described above may be implemented. The EDS can be used for time-sharing multiplexing of devices shared by different charging voltages, when the EDS is connected into an 800V charging pile, direct-current voltage is applied between a first input end T1 and a second input end T2 of the voltage conversion device and is directly connected into a high-voltage bus, and a third input end T3 is disabled. When the EDS is connected into the 400V charging pile, direct-current voltage is applied between the third input end T3 and the second input end T2, and the boosted voltage is output at the first input end T1 and the second input end T2 and is connected into the high-voltage bus.
In addition, as a modification, capacitors C4 and C5 may be connected between the first input terminal T1 and the second input terminal T2, and the capacitors C4 and C5 may be connected in series, so that the current output between the first input terminal T1 and the second input terminal T2 may be continuously and relatively constant.
The electric drive system can achieve the following technical effects: 1. a 400V-800V compatible direct current charging system can be realized without additionally adding a 400V-800V transformation device; 2. the driving system and the direct current charging system are multiplexed in a time-sharing mode, so that the economy of the whole vehicle is improved, the weight of the whole vehicle is reduced, and the space is saved; 3. when the driving system is used as a charging function, the winding of the driving motor does not participate in working, and no electromagnetic torque exists, so that the problems of mechanical jitter and NVH are avoided. 4. When the inverter is used as a switched capacitor DC/DC converter, the energy storage inductance required by a conventional DC/DC converter is not required, resulting in improved EMI and conversion efficiency.
According to other embodiments of the present invention, a charging and driving system for an electric vehicle is provided, which charges a power battery of the electric vehicle when a charging pile is connected, and drives a motor and supplies power to high-voltage accessories by the power battery when the electric vehicle is driven. Specifically, the charging and driving system includes a battery, one or more high voltage accessories, the electric drive system, and a plurality of switch controls. Wherein the plurality of switch controls are configured to perform on-off control between the charging port and the electric drive system to implement the following charging scheme: providing 800V voltage to the battery and the accessory when the 800V voltage is input to the charging port; when the 400V voltage is input into the charging port, the 400V is boosted to 800V voltage through the electric drive system and then is provided for the battery and the high-voltage accessories. Specifically, the charging port includes a charging port for 800V and a charging port for 400V, and thus the charging and driving system is compatible with two different levels of charging piles. When in the driving mode, the charging and driving system is disconnected from the charging port, and the power battery is used for supplying power to each high-voltage accessory.
According to further embodiments of the present invention, an electric vehicle is provided, which uses the above charging and driving system for charging or driving.
Those of skill in the art would appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the aspects disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To demonstrate interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Various modifications may be made by those skilled in the art without departing from the spirit of the invention and the appended claims.
Claims (10)
1. A voltage conversion device for an electric vehicle, comprising:
the inverter unit comprises three batches of a plurality of switch assemblies for providing three-phase current required by a motor of the electric automobile, a first input end and a second input end;
a third input terminal configurably connected to a three-phase output terminal of the inverter unit;
wherein the inverter unit is configured to:
converting a second direct current voltage input via the third input terminal and the second input terminal into a first direct current voltage to provide the first direct current voltage between the first input terminal and the second input terminal.
2. The voltage conversion apparatus according to claim 1, further comprising:
a first switch group configured to couple three-phase outputs of the inverter unit with three windings of the motor, respectively; and
a second switch group configured to couple the third input terminals with three-phase output terminals of the inverter units, respectively.
3. The voltage conversion device according to claim 1, wherein each of the three switching assemblies comprises a first switching assembly, a second switching assembly, a third switching assembly and a fourth switching assembly connected in series with each other, and each of the switching assemblies is formed by connecting a transistor and a diode in parallel.
4. The voltage conversion device of claim 3, wherein, for each batch of switch assemblies,
the first switch assembly is coupled to the first input;
the fourth switching component is coupled to the second input;
a junction of the second switching component and the third switching component is coupled to one phase output of the inverter unit.
5. The voltage conversion device of claim 3, wherein for each batch of switching components, the output of the first switching component is coupled to the input of the fourth switching component via a capacitor.
6. The voltage conversion device according to claim 1, wherein the first direct current voltage is 800V and the second direct current voltage is 400V.
7. An electric drive system comprising a voltage conversion device as claimed in any one of claims 1 to 6.
8. A charging and driving system for an electric vehicle, comprising:
a battery;
one or more accessories;
the electric drive system of claim 7; and
a plurality of switch controls configured to perform on-off control between a charging port and the electric drive system to achieve:
providing a first direct current voltage to the battery and the accessory when the first direct current voltage is input to the charging port;
when a second direct current voltage is input to the charging port, the second direct current voltage is boosted to the first direct current voltage via the electric drive system for provision to the battery and the accessory.
9. The system of claim 8, wherein the switch control is configured to:
powering the accessory with the battery in a drive mode.
10. An electric vehicle comprising the system of claim 8 or 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110094483.6A CN112737393A (en) | 2021-01-25 | 2021-01-25 | Voltage conversion device method for electric automobile and electric drive system |
| PCT/CN2021/107558 WO2022156171A1 (en) | 2021-01-25 | 2021-07-21 | Voltage conversion apparatus for electric vehicle, method, and electric drive system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110094483.6A CN112737393A (en) | 2021-01-25 | 2021-01-25 | Voltage conversion device method for electric automobile and electric drive system |
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| CN112737393A true CN112737393A (en) | 2021-04-30 |
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| CN202110094483.6A Pending CN112737393A (en) | 2021-01-25 | 2021-01-25 | Voltage conversion device method for electric automobile and electric drive system |
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| WO (1) | WO2022156171A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022156171A1 (en) * | 2021-01-25 | 2022-07-28 | 蔚来汽车科技(安徽)有限公司 | Voltage conversion apparatus for electric vehicle, method, and electric drive system |
| DE102022002606A1 (en) | 2022-07-18 | 2024-01-18 | Mercedes-Benz Group AG | Vehicle and method of operating it |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099239A (en) * | 2014-05-06 | 2015-11-25 | 上海汽车集团股份有限公司 | Inverter, automobile power supply device, and automobile apparatus |
| KR102454222B1 (en) * | 2017-07-21 | 2022-10-17 | 현대자동차주식회사 | Electric vehicle |
| DE102017123346A1 (en) * | 2017-10-09 | 2019-04-11 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | A method for initializing a DC charging of a battery by means of an inverter |
| DE102018120236A1 (en) * | 2018-08-20 | 2020-02-20 | Thyssenkrupp Ag | Charging device with controllable intermediate circuit center voltage and drive system with such a charging device |
| DE102018009848A1 (en) * | 2018-12-14 | 2019-06-27 | Daimler Ag | Circuit arrangement for a motor vehicle, in particular for a hybrid or electric vehicle |
| CN112737393A (en) * | 2021-01-25 | 2021-04-30 | 蔚来汽车科技(安徽)有限公司 | Voltage conversion device method for electric automobile and electric drive system |
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2021
- 2021-01-25 CN CN202110094483.6A patent/CN112737393A/en active Pending
- 2021-07-21 WO PCT/CN2021/107558 patent/WO2022156171A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022156171A1 (en) * | 2021-01-25 | 2022-07-28 | 蔚来汽车科技(安徽)有限公司 | Voltage conversion apparatus for electric vehicle, method, and electric drive system |
| DE102022002606A1 (en) | 2022-07-18 | 2024-01-18 | Mercedes-Benz Group AG | Vehicle and method of operating it |
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| Publication number | Publication date |
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| WO2022156171A1 (en) | 2022-07-28 |
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