CN112297902B - Energy conversion device, power system and vehicle - Google Patents

Energy conversion device, power system and vehicle Download PDF

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Publication number
CN112297902B
CN112297902B CN201910690156.XA CN201910690156A CN112297902B CN 112297902 B CN112297902 B CN 112297902B CN 201910690156 A CN201910690156 A CN 201910690156A CN 112297902 B CN112297902 B CN 112297902B
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external
coil
switch
power switch
phase
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CN112297902A (en
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郭彩芳
姚鹏飞
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BYD Co Ltd
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BYD Co Ltd
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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
    • B60L53/24—Using the vehicle's propulsion converter for charging
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • 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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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 invention relates to the technical field of electronics, and provides an energy conversion device, a power system and a vehicle, wherein the energy conversion device comprises: a motor including a motor coil connected to a second end of the external DC charging port; the bridge arm converter comprises a first bus end, a second bus end and a plurality of outgoing lines, the first bus end is connected with a first end of an external battery, the second bus end is respectively connected with a first end of an external direct current charging port and a second end of the external battery, and the bridge arm converter is connected with the motor coil through the plurality of outgoing lines. When the device is applied to a vehicle, the bridge arm converter and the motor coil can be reused in the processes of motor driving and battery charging of the vehicle, and the circuit integration level is improved, so that the technical problems of low integration level and large occupied space of automobile parts in the prior art are solved.

Description

Energy conversion device, power system and vehicle
Technical Field
The application belongs to the technical field of electronics, and especially relates to an energy conversion device, a power system and a vehicle.
Background
In the field of electric vehicles, a motor, an electric controller, a reducer and a boost direct-current power supply DC are used as important components of the electric vehicle, almost all new energy vehicle types are provided with the modules, but integration methods of the modules on the whole vehicle are different, the earliest vehicle type is that the modules are developed respectively and then connected by a wire harness, a bracket and the like on the whole vehicle, and later some vehicle types begin to integrate two of the modules, for example, two-in-one motor reducer and two-in-one electric controller and direct-current power supply DC are physically integrated, and parts of the electric vehicle continuously develop towards multi-module integration.
However, at present, the integration mode is controlled by the connection relation of the integrated circuits, the integration effect is not ideal, only a plurality of modules are separately designed and installed, or two or three of the modules are integrated, the cost is high, and the occupied space of the whole vehicle is still large.
Disclosure of Invention
The embodiment of the application provides a vehicle, an energy conversion device and a power system thereof, and aims to solve the technical problems of low integration level and large occupied space of automobile parts.
The present application is achieved as an energy conversion apparatus, comprising:
a motor including a motor coil connected to a second end of the external DC charging port;
the bridge arm converter comprises a first bus end, a second bus end and a plurality of outgoing lines, the first bus end is connected with a first end of an external battery, the second bus end is respectively connected with a first end of an external direct current charging port and a second end of the external battery, and the bridge arm converter is connected with the motor coil through the plurality of outgoing lines;
the external battery, the bridge arm converter and the motor coil form a driving circuit for driving the motor;
the motor coil, the bridge arm converter and the external direct current charging port form a direct current charging circuit for charging an external battery;
the motor coil comprises a first-phase coil, a second-phase coil and a third-phase coil, each phase coil comprises N coil branches, first ends of the N coil branches in each phase coil are connected in common and then connected with the bridge arm converter through outgoing lines, second ends of the N coil branches in each phase coil are correspondingly connected with second ends of the N coil branches in the other two-phase coil one by one to form N neutral points, and an external direct current charging port is connected with the M neutral points; wherein N is an integer greater than 1, and M is a positive integer less than N;
the method for acquiring the M value comprises the following steps:
a phase coil in the control motor coil, a phase bridge arm connected with the phase coil and an external direct current charging port form a direct current charging circuit for charging an external battery;
calculating the target inductance L of the DC charging circuit by controlling the conducting state of a power switch in a phase bridge armneed；
Adjusting the number of the external direct current charging ports connected with the neutral points, controlling the motor coil, the bridge arm converter and the external direct current charging ports to form a direct current charging circuit for charging an external battery, and respectively calculating actual inductance values L1, L2 and L3 … under different neutral point numbers;
and determining the number of the external direct current charging ports connected with the neutral point according to the target inductance and the actual inductance, thereby obtaining the M value.
Another object of the present application is to provide a power system, which includes the above energy conversion device and a control module, wherein the energy conversion device includes:
a motor including a motor coil connected to a second end of the external DC charging port;
the motor control module comprises a bridge arm converter, the bridge arm converter comprises a first bus end, a second bus end and a plurality of outgoing lines, the first bus end is connected with a first end of an external battery, the second bus end is respectively connected with a first end of an external direct-current charging port and a second end of the external battery, and the bridge arm converter is connected with the motor coil through the plurality of outgoing lines;
the control module is used for controlling an external battery, the bridge arm converter and the motor coil to form a driving circuit for driving the motor, and is also used for controlling the motor coil, the bridge arm converter and the external direct-current charging port to form a direct-current charging circuit for charging the external battery;
the driving circuit and the DC charging circuit of the motor share the motor coil.
Another object of the present application is to provide a vehicle including the power system described above.
The application provides an energy conversion device, a power system and a vehicle, wherein the energy conversion device can work in a driving mode and a direct current charging mode in a time-sharing mode by adopting a motor and a bridge arm converter, when the energy conversion device is used for driving the motor, an external battery, the bridge arm converter and a motor coil form a driving circuit for driving the motor, and when the energy conversion device is used for direct current charging, an external direct current charging port, the motor coil, the bridge arm converter and the external battery form a direct current charging circuit for charging an external battery. Therefore, in the driving circuit and the charging circuit, the bridge arm converter and the motor coil are multiplexed, so that the circuit structure is simplified, and the integration level is improved, thereby solving the technical problems of low integration level and large occupied space of automobile parts in the prior art.
Drawings
FIG. 1 is a schematic block diagram of an apparatus according to a first embodiment of the present disclosure;
FIG. 2 is a schematic diagram of the structure of the apparatus provided in the first embodiment of the present application;
FIG. 3 is a schematic diagram of a portion of an apparatus provided in a second embodiment of the present application;
FIG. 4 is a schematic diagram of a portion of an apparatus provided in a third embodiment of the present application;
FIG. 5 is a schematic diagram of an apparatus according to a fourth embodiment of the present application;
FIG. 6 is a schematic diagram of an apparatus provided in a fifth embodiment of the present application;
FIG. 7 is a block schematic diagram of a powertrain system provided by a sixth embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Implementations of the present application are described in detail below with reference to the following detailed drawings:
fig. 1 shows a schematic block diagram of an energy conversion device 1 provided in an embodiment of the present application, and for convenience of description, only the parts related to the embodiment are shown, and the details are as follows:
as shown in fig. 1, an energy conversion apparatus 1 provided in the embodiment of the present application includes an electric motor 11 and a bridge arm inverter 12.
Specifically, referring to fig. 1, the motor 11 includes a motor coil 111, the motor coil 111 being connected to a second end of the external dc charging port 2;
the bridge arm converter 12 includes a first bus terminal connected to a first end of the external battery 3, a second bus terminal connected to a first end of the external dc charging port 2 and a second end of the external battery 3, and a plurality of outgoing lines, and the bridge arm converter 12 is connected to the motor coil 111 through the plurality of outgoing lines.
The energy conversion device 1 operates in a driving mode and a charging mode in a time-sharing manner.
When the energy conversion device 1 operates in the drive mode, the external battery 3, the arm inverter 12, and the motor coil 111 form a drive circuit for driving the motor 11.
When the energy conversion device 1 operates in the charging mode, the motor coil 111, the arm converter 12, and the external dc charging port 2 form a dc charging circuit that charges the external battery 3.
In the above-described drive circuit, the external battery 3 inputs direct current, and the arm converter 12 converts the direct current into three-phase alternating current to drive the motor 11.
In the above dc charging circuit, the external dc charging port 2 inputs dc power, switches the on/off state of the power switch in the bridge arm converter 12, and cooperates with the motor coil 111 to realize energy storage and energy release, and the bridge arm converter 12 outputs boosted dc power to charge the external battery 3.
For the motor coil 111 in the motor 11, in the above-mentioned dc charging circuit, energy is stored and released, and in the above-mentioned driving circuit, it is used for driving the motor 11.
The bridge arm inverter 12 is configured to cooperate with the motor coil 111 to boost voltage in the dc charging mode, and is configured to convert dc power into three-phase ac power to drive the motor 111 in the driving mode.
In specific implementation, when the energy conversion device 1 is used for charging, the energy conversion device 1 may be connected to an external dc power supply through the external dc charging port 2, and the dc power supply may be a dc power obtained by rectifying an external ac power supply through the charging port, or a dc power input by the external dc power supply through the external dc charging port 2.
In addition, it should be noted that, during specific operation, the energy conversion apparatus 1 may not only operate in the driving mode and the dc charging mode, but also operate in the dc discharging mode, and the various operating modes of the energy conversion apparatus 1 will be described in detail later, which is not described herein again.
In addition, in the present application, "external battery", "external dc charging port", and "external ac charging port" described in the present embodiment are "external" with respect to the energy conversion device 1, and are not "external" of the vehicle in which the energy conversion device 1 is located.
Further, as an embodiment of the present application, as shown in fig. 2, the motor coil 111 includes a first phase coil U, a second phase coil V, and a third phase coil W.
Specifically, referring to fig. 2, each phase coil includes N coil branches, first ends of the N coil branches in each phase coil are connected in common and then connected to the bridge arm converter 12 through outgoing lines, second ends of the N coil branches in each phase coil are connected to second ends of the N coil branches in the other two phase coils in a one-to-one correspondence manner to form N neutral points, and the external dc charging port 2 is connected to M neutral points; wherein N is an integer greater than 1, and M is a positive integer less than N.
It should be noted that each phase coil may be matched with the bridge arm converter 12 to boost the dc power input from the external dc charging port 2, and meanwhile, if the charging power of the boosted dc power needs to meet the requirement, the inductance of the coil should reach the expected inductance.
Further, as an embodiment of the present application, a method for obtaining the number M of neutral points needed to be connected when the connected coil reaches a desired inductance is provided.
Specifically, the method for acquiring the M value includes:
step 101: one phase coil of the control motor coil 111, one phase arm connected to the one phase coil, and the external dc charging port 2 form a dc charging circuit that charges the external battery 3.
Step 102: calculating the target inductance L of the DC charging circuit by controlling the conducting state of a power switch in a phase bridge armneed。
Step 103: the number of connections between the external dc charging port 2 and the neutral point is adjusted, the motor coil 111, the arm converter 12, and the external dc charging port 2 are controlled to form a dc charging circuit for charging the external battery 3, and the actual inductance values L1, L2, and L3 … in the number of different neutral points are calculated, respectively.
Step 104: and determining the number of the external direct current charging port 2 connected with the neutral point according to the target inductance and the actual inductance, thereby obtaining the value M.
In order to better understand the technical content of step 101 to step 104, a structure of the bridge arm converter 12 is described, where the bridge arm converter at least includes three-phase bridge arms connected in parallel, a midpoint of each phase of bridge arm is connected to one phase of coil in the motor coil 111 in a one-to-one correspondence manner, and a dc boosting process can be implemented by switching a power switch of each phase of bridge arm to cooperate with each phase of coil in the motor coil 111. For example, the bridge arm converter 12 includes three-phase bridge arms, namely a first phase bridge arm 121, a second phase bridge arm 122, and a third phase bridge arm 123, which are connected in parallel with each other, each phase bridge arm includes two power switches connected in series, and the midpoints of the two power switches in each phase bridge arm are connected to each phase coil in a one-to-one correspondence manner.
In order to more clearly understand the technical content of steps 101 to 104, in the following description of the technical solutions, one phase leg is designated as the first phase leg 121, and one phase coil is designated as the first phase coil U for explanation. It should be noted that the one-phase coil may be a first-phase coil U, a second-phase coil V, or a third-phase coil W, where the one-phase arm connected to the first-phase coil U is a first-phase arm, the one-phase arm connected to the second-phase coil V is a second-phase arm, and the one-phase coil connected to the third-phase coil W is a third-phase arm.
In step 101, specifically, the external dc charging port 2, the first-phase coil 111, and the first-phase arm 121 form a dc charging circuit for the external battery 3 by switching the power switch in the first-phase arm 121.
In step 102, specifically, the conductive states of the first power switch Q1 and the second power switch Q2 in the first phase arm 121 are switched, and the target inductance L of the dc charging circuit is calculatedneed。
In step 103, specifically, the number M of the external dc charging port 2 connected to the neutral point is adjusted, the number of the coils connected to the dc in the motor coil 111 is controlled, and the actual inductance generated by the first phase coil U in the dc charging circuit formed by the external dc charging port 2, the first phase coil U, the first phase arm 121, and the external battery 3 is calculated under the condition that the number M of the neutral points with different numbers is not connected.
For the above step 104, specifically, the target inductance L is determinedneedAnd the actual inductance L, and further determining the number M of the connected neutral point connections.
In this embodiment, the energy conversion device 1 including the motor 11 and the bridge arm converter 12 is adopted, so that the energy conversion device 1 can operate in a driving mode and a direct current charging mode in a time-sharing manner, when the energy conversion device is used for driving the motor 11, the external battery 2, the bridge arm converter 12 and the motor coil 111 form a driving circuit for driving the motor 11, and when the energy conversion device is used for direct current charging, the external direct current charging port 2, the motor coil 111, the bridge arm converter 12 and the external battery 3 form a direct current charging circuit for charging the external battery, so that the bridge arm converter 12 and the motor coil 111 are multiplexed in the driving circuit and the charging circuit, thereby simplifying a circuit structure, improving integration level, and solving technical problems of low integration level and large occupied space of automobile parts in the prior art. Meanwhile, the embodiment also provides a method for calculating the number of the access neutral points, so that the multiplexed motor coil 111 meets the requirement of inductance, the charging power of the external battery 3 is effectively improved, and the charging efficiency is improved.
Further, as an embodiment of the present application, the step 102 further includes the following steps:
step 1021: and controlling a power switch in a phase bridge arm to be conducted, forming an energy storage loop by the power switch, a phase coil and the external direct current charging port 2, and calculating to obtain the current increment of the phase coil.
Step 1022: and controlling one power switch in one phase of bridge arm to be switched off and the other power switch to be switched on, forming an energy release loop by one phase of coil, the other power switch and the external battery 3, and calculating to obtain the current decrement of the first coil.
Step 1023: obtaining the target inductance L of the one-phase coil according to the current increment and the current decrementneed。
For step 1021, specifically, the second power switch Q2 in the first phase arm is controlled to be turned on, the first power switch Q1 is controlled to be turned off, the external dc charging port 2, the first phase coil U, and the second power switch Q2 form an energy storage loop for the first phase coil U, and the current increment of the first phase coil U in the energy storage process is calculated.
In step 1022, specifically, the first power switch in the first phase arm 121 is controlled to be turned on, the second power switch Q2 is controlled to be turned off, the external dc charging port 2, the first phase coil U, the first power switch Q1, and the external battery 3 form an energy release loop of the first phase coil U, and the current decrement of the first phase coil U in the energy release process is calculated.
In the embodiment, the target inductance L of the first-phase coil is obtained by switching the first power switch Q1 and the second power switch Q2need。
For step 1021, specifically, when the second power switch Q2 is turned on, the drain current V of the second power switch Q2DSSmaller, first phase coil U produces voltage drop IL×RLFurther, the following formula (1) is obtained:
VL＝VI-(VDS+IL×RL) (1)
wherein, VIRepresenting the input voltage, V, of the external DC charging port 2DSRepresenting the drain voltage, R, of the second power switch Q2LRepresenting the resistance of the first phase coil U.
It should be noted that the current of the first phase coil U increases with the increase of the applied voltage, and at the same time, the voltage value across the first phase coil U is a constant value, resulting in the current I passing through the first phase coil ULLinearly increasing, and obtaining the relation between the voltage at two ends of the first phase coil U and the inductance of the first phase coil U by the following formula (2):
Figure BDA0002147631120000081
wherein, L represents inductance of the first phase coil U, and t represents time for which the first phase coil U is turned on.
The current increment is obtained by calculation according to the above formula (1) and formula (2), and the calculation formula (3) of the current increment is as follows:
Figure BDA0002147631120000082
wherein, Delta IL(+) denotes the current increment of the first-phase coil U, TONRepresenting the time that the second power switch Q2 is on.
In this embodiment, the current increment of the first-phase coil U in the on state of the second power switch Q2 can be obtained by formula (3).
With regard to the step 1022, specifically, when the first power switch Q1 is turned on and the second power switch Q2 is turned off, the drain impedance of the second power switch Q2 becomes high, and the current flowing through the inductance L of the first phase coil U cannot change instantaneously, so that the current in the charging circuit is transferred from the second power switch Q2 to the second power switch, and the current passing through the first phase coil U decreases at this time, the voltage across the first phase coil U is reversed in polarity, and the voltage across the first phase coil U can be calculated by the following equation (4):
VL＝(VO+Vd+IL×RL)-VI (4)
wherein, VORepresenting the output terminal voltage, V, of the external battery 3dRepresenting the voltage across the first power switch Q1.
It should be noted that the current of the first phase coil U decreases during the time when the second power switch Q2 is turned off and the first power switch Q1 is turned on, and the voltage across the first phase coil U is constant, so that the current of the first phase coil U decreases linearly, which is specifically calculated by the following formula (5):
Figure BDA0002147631120000091
wherein, Delta IL(-) represents the current decrement of the first phase coil U, TOFFRepresenting the second power switch Q2 open and the first power switch Q1 time of conduction.
In the present embodiment, the current decrement of the first-phase coil U in the off state of the second power switch Q2 can be obtained by the formula (5).
With respect to step 1023, when the current increment and the current decrement are equal in the on and off states of first power switch Q1 and second power switch Q2 which are continuously switched, the dc charging circuit formed by external dc charging port 2, first phase coil U, first phase arm 121, and external battery 3 is in a stable state, and at the same time, in an ideal state, drain current V of second power switch Q2 is set to be in a stable stateDSResistance R of first phase coil ULVoltage V across the first power switch Q1dThe numerical values are all small and can be ignored, D1+D2＝1，TON+TOFFCalculate Δ I as 1L(-)＝ΔIL(+), obtaining
Figure BDA0002147631120000092
Will be provided with
Figure BDA0002147631120000093
The input voltage V of the external DC charging port 2 is obtained by substituting the above equation (3) and equation (4)IAnd the output end voltage V of the batteryOAnd obtaining a target inductance value based on the linear relation, and calculating the target inductance value through the following formula (6):
Figure BDA0002147631120000094
wherein L isneedRepresenting target inductance, VORepresenting the output terminal voltage, V, of the batteryIRepresenting the input voltage of the external DC charging port 2, D1Representing the duty cycle at which the second power switch is switched on, D2Representing the duty cycle, Δ I, at which the second power switch is turned off1Represents the amount of change in the input current of the external dc charging port 2 during the time when the second power switch is turned off, and f represents the frequency at which a power switch is switched on and off.
In the present embodiment, the target inductance of the first-phase coil U in the on and off states where the first power switch Q1 and the second power switch Q2 are switched continuously can be calculated by the above equation (6).
For the step 103, the actual inductance of the first-phase coil U is calculated by the following formula (7):
Figure BDA0002147631120000101
wherein L represents the actual inductance, V1Representing the input voltage of the external DC charging port 2, I1Represents t1Current, I, through the first phase winding U at the moment2Represents t2The current through the first phase coil U is at that moment.
Further, when the inductance of the first-phase coil connected to the external dc charging port 2 in different numbers of neutral points needs to be calculated, the above formula (7) is used to perform repeated calculation to obtain the actual inductances L1, L2, and L3 … in different numbers of neutral points.
In the present embodiment, the actual inductance of the first-phase coil U can be obtained by the above equation (7).
For the step 104, specifically, the actual inductance is compared with the target inductance, and when the actual inductance is greater than the target inductance, the number of connections between the external dc charging port 2 and the neutral point is M.
Preferably, in the step 103, for the first-phase coils U connected to the same number of neutral points, the generated inductance of the first-phase coils U at different positions is tested according to the different inductances when the first-phase coils U rotate at different positions, and the first-phase coils U at different positions are tested according to the method of the step 103 to obtain the generated inductance of the first-phase coils U at different positions, so as to obtain the inductances of the plurality of first-phase coils U at different positions, and the smallest inductance is used as the actual inductance of the first-phase coils U. That is, the inductance at all positions of the first phase coil U is greater than that at all positions of the first phase coil UOr equal to the target inductance LneedAnd then, the number of the external direct current charging port 2 connected with the neutral points is M, and the number of the neutral points required to be connected into the first phase coil U is determined according to the actual inductance of the first phase coil U.
In this embodiment, the magnitude of the actual inductance and the target inductance is compared to obtain a value M of the number of connections between the external dc charging port 2 and the neutral point, so as to meet the boosting requirement of the dc charging circuit and increase the charging power.
Through the implementation of the steps 101 to 104, the number of the neutral points required to be connected can be determined, so as to meet the boosting requirement of the direct current charging circuit and improve the charging power.
It should be noted that, the above detailed description describes, by taking the first phase coil U as an example, a method for calculating the number of neutral point connections connected in the first phase coil U, and meanwhile, a method for calculating the number of neutral point connections connected in the second phase coil V and the third phase coil W is the same as the method for calculating the number of neutral point connections connected in the first phase coil U, as described in the above steps 101 to 104, and in addition, preferably, for the second phase coil V and the third phase coil W at different positions of rotation, inductance values of the second phase coil V and the third phase coil W at different positions are tested, multiple sets of data are obtained, and the number of neutral points needed to be connected in the second phase coil V and the third phase coil W is determined, so that the second phase coil V and the third phase coil W are greater than or equal to the target inductance value L at any positionneedAnd the boosting requirement of a direct current circuit is met.
It should be noted that, in the dc charging circuit formed by the external dc charging port 2, the motor coil 111, the bridge arm converter 12, and the external battery 3, a dc charging circuit may be formed by one phase coil in the motor coil 111 and one phase bridge arm in the bridge arm converter 12, a dc charging circuit may be formed by two phase coils in the motor coil 111 and two phase bridge arms in the bridge arm converter 12, and a dc charging circuit may be formed by three phase coils in the motor coil 111 and three phase bridge arms in the bridge arm converter 12, which is not specifically limited here, and the number of connected neutral points required for calculating each phase coil is the same as in steps 101 to 104, and is not described here again.
Further, as an embodiment of the present application, as shown in fig. 3, the energy conversion apparatus 1 further includes a neutral point switch 13.
Specifically, referring to fig. 3, a neutral point switch 13 is connected between the neutral point and the external dc charging port, and the neutral point switch 13 is used to control M neutral points of N neutral points of the motor coil 111 to be connected to the external dc charging port 2.
In this embodiment, the neutral point switch 13 may control M neutral points of the N neutral points of the motor coil 111 to be connected to the external dc charging port 2, so that the inductance of the motor coil 111 meets the boosting requirement of the dc charging circuit, the charging power is increased, and the charging efficiency of the external battery 3 is improved.
Further, as an embodiment of the present application, as shown in fig. 4, the energy conversion apparatus 1 further includes a first switch module 14.
Specifically, referring to fig. 4, the first switching module 14 is connected between the arm converter 12 and the motor coil 111, and the first switching module 14 is used for controlling connection of each phase coil to the arm converter 12.
In the present embodiment, any number of phase coils in the motor coils 111 can be controlled by the first switching module 14 to be connected to the arm inverter 12 to form a dc charging circuit, which increases flexibility in use of the circuit.
Further, as an embodiment of the present application, as shown in fig. 5, the bridge arm converter 12 includes a first phase bridge arm 121, a second phase bridge arm 122 and a third phase bridge arm 123, and the first switch module 14 includes a first switch K1, a second switch K2 and a third switch K3.
Specifically, referring to fig. 5, the first phase leg 121 includes a first power switch Q1 and a second power switch Q2 connected in series, first midpoints of the first power switch Q1 and the second power switch Q2 are connected to a first end of a first switch K1 through a first lead wire, a second end of the first switch K1 is connected to a first phase coil U through a first lead wire, the second phase leg 122 includes a third power switch Q3 and a fourth power switch Q4 connected in series, second midpoints of the third power switch Q3 and a fourth power switch Q4 are connected to a first end of a second switch K2 through a second lead wire, a second end of the second switch K2 is connected to a second phase coil V through a second lead wire, the third phase leg 123 includes a fifth power switch Q5 and a sixth power switch Q6 connected in series, third midpoints of the fifth power switch Q5 and the sixth power switch Q6 are connected to a third end of the third switch K3 through a second lead wire, a second end of the third switch K3 is connected to the third-phase coil W via a third lead wire, a first end of the first power switch Q1, a first end of the third power switch Q3, and a first end of the fifth power switch Q5 are connected in common to form a first junction end of the arm converter 12, and a second end of the second power switch Q2, a second end of the fourth power switch Q4, and a second end of the sixth power switch Q6 are connected in common to form a second junction end of the arm converter 12.
The first middle point of the first power switch Q1 and the first middle point of the second power switch Q2 are points located on a connection line of the first power switch Q1 and the second power switch Q2, and the coil is simultaneously connected with the first power switch Q1 and the second power switch Q2 through the points.
In the present embodiment, the plurality of power switches in the bridge arm converter 12 may be implemented by devices capable of performing switching operations, such as power transistors, Metal-Oxide-Semiconductor Field-Effect transistors (MOSFETs), Insulated Gate Bipolar Transistors (IGBTs), and the like, in which diodes are connected in parallel.
Specifically, when first switch K1 is turned on and second switch K2 and third switch K3 are turned off, external dc charging port 2, neutral point switch 13, first-phase coil U, first-phase arm 121, and external battery 3 form a dc charging circuit. Similarly, the external dc charging port 2, the neutral point switch 13, the one-phase coil of the motor coil 111, the one-phase arm of the arm converter 12, and the external battery 3 may form a dc charging circuit.
Specifically, when first switch K2 is turned on, second switch K2 is turned on, and third switch K3 is turned off, external dc charging port 2, neutral point switch 13, first phase coil U, second phase coil V, first phase arm 121, second phase arm 122, and external battery 3 form a dc charging circuit. Similarly, the external dc charging port 2, the neutral point switch 13, the two-phase coil of the motor coil 111, the two-phase arm of the arm converter 12, and the external battery 3 may form a dc charging circuit.
Specifically, when first switch K2, second switch K2, and third switch K3 are all turned on, external dc charging port 2, neutral point switch 13, first phase coil U, second phase coil V, third phase coil W, first phase arm 121, second phase arm 122, third phase arm 123, and external battery 3 form a dc charging circuit.
Alternatively, when first switch K2, second switch K2, and third switch K3 are all turned on, external battery 3, first phase arm 121, second phase arm 122, third phase arm 123, first phase coil U, second phase coil V, and third phase coil W form a drive circuit for driving motor 11.
In this embodiment, the dc charging circuits and the driving circuits can be switched by switching the on/off state of each switch in the first switch module 14, and the bridge arm converter 12 and the motor coil 111 are multiplexed, so that the circuit structure is simplified, and the integration level is improved, thereby solving the technical problems of low integration level and large occupied space of automobile parts in the prior art.
Further, as an embodiment of the present application, as shown in fig. 6, the energy conversion apparatus 1 further includes a first capacitor C1.
Specifically, referring to fig. 6, the first capacitor C1 is connected between the first terminal of the external dc charging port 2 and the second terminal of the external dc charging port 2.
In this embodiment, the first capacitor C1 is provided in the energy conversion device 1, so that the direct current input from the external direct current charging port 2 can be filtered, and it is ensured that other noise does not interfere with the charging process.
Further, as an embodiment of the present application, as shown in fig. 6, the energy conversion apparatus 1 further includes a second capacitor C2.
Specifically, referring to fig. 6, a second capacitor C2 is connected between the first bus terminal of the bridge arm converter 12 and the second bus terminal of the bridge arm converter 12.
In the present embodiment, the second capacitor C2 is provided in the energy conversion device 1, so that the dc power input by the external battery 3 can be filtered, and the dc power output by the bridge arm converter 12 can be filtered, thereby preventing other noise from interfering with the charging and driving processes.
Further, as an embodiment of the present application, as shown in fig. 6, the energy conversion apparatus 1 further includes a second switch module 15.
In particular, with reference to fig. 6, the second switch module 15 comprises a fourth switch K4 and a fifth switch K5, the fourth switch K4 being connected between the second junction of the bridge arm converter 12 and the first end of the external dc charging port 2, the second no switch K5 being connected between the neutral switch 13 and the second end of the external dc charging port 2.
In the present embodiment, the second switch module 15 in the energy conversion device 1 can effectively switch the dc charging circuit formed by the external dc charging port 2, the motor coil 111, the arm converter 12, and the external battery 3.
As an embodiment of the present application, as shown in fig. 6, the energy conversion apparatus further includes a sixth switch K6, a seventh switch K7, and a resistor R.
Specifically, referring to fig. 6, a sixth switch K6 and a resistor R are connected in series between the first end of the external battery 3 and the first bus terminal of the arm converter 12, and a seventh switch K7 is connected between the first end of the external battery 3 and the first bus terminal of the arm converter 12.
In the present embodiment, by providing the sixth switch K6, the seventh switch K7, and the resistor R in the energy conversion device 1, before charging the external battery 3, the sixth switch K6 is turned off, the seventh switch K7 is turned on, after the resistor R is precharged, the sixth switch K6 is turned on, and the seventh switch K7 is turned off, so that the sixth switch K6, the seventh switch K7, and the resistor R form a precharge circuit, thereby protecting the circuit and reducing the failure rate of the energy conversion device 1.
In order to better understand the content of the present application, the following takes the energy conversion device 1 shown in fig. 6 as an example to specifically explain the working principle of the energy conversion device 1 provided in the present application, and the following details are given:
specifically, when the energy conversion device 1 performs dc charging, the fourth switch K4, the fifth switch K5, the first switch K1, and the seventh switch K are turned on, the second switch K2, the third switch K3, and the sixth switch K6 are turned off, the resistor R completes precharge, the sixth switch K6 is turned on, the seventh switch K7 is turned off, and the external dc charging port 2 inputs dc power, and charges the external battery 3 after boosting the dc power through the first-phase coil U and the first-phase arm 121 in the motor coil 111.
Or, the fourth switch K4, the fifth switch K5, the second switch K2, and the seventh switch K are turned on, the first switch K1, the third switch K3, and the sixth switch K6 are turned off, the resistor R completes the precharge, the sixth switch K6 is turned on, the seventh switch K7 is turned off, the external dc charging port 2 inputs the dc power, and the dc power is boosted through the second phase coil V in the motor coil 111 and the second phase arm 122 to charge the external battery 3.
Alternatively, fourth switch K4, fifth switch K5, third switch K3, and seventh switch K are turned on, first switch K1, second switch K2, and sixth switch K6 are turned off, resistor R completes precharge, sixth switch K6 is turned on, seventh switch K7 is turned off, and external dc charging port 2 inputs dc power, and the dc power is boosted by third phase coil W in motor coil 111 and third phase arm 123 to charge external battery 3.
Or, the fourth switch K4, the fifth switch K5, the first switch K1, the third switch K3, and the seventh switch K are turned on, the second switch K2, and the sixth switch K6 are turned off, the resistor R completes the precharge, the sixth switch K6 is turned on, the seventh switch K7 is turned off, and the external dc charging port 2 inputs the dc power, and the dc power is boosted through the first phase coil U and the third phase coil W in the motor coil 111, the first phase arm 121, and the third phase arm 123, and then the external battery 3 is charged.
Or, the fourth switch K4, the fifth switch K5, the first switch K1, the second switch K2, and the seventh switch K are turned on, the third switch K3, and the sixth switch K6 are turned off, the resistor R completes the precharge, the sixth switch K6 is turned on, the seventh switch K7 is turned off, and the external dc charging port 2 inputs the dc power and charges the external battery 3 after boosting the dc power through the first phase coil U, the second phase coil V, the first phase arm 121, and the second phase arm 122 in the motor coil 111.
Alternatively, the fourth switch K4, the fifth switch K5, the second switch K2, the third switch K3, and the seventh switch K are turned on, the first switch K1 and the sixth switch K6 are turned off, the resistor R completes the precharge, the sixth switch K6 is turned on, the seventh switch K7 is turned off, the external dc charging port 2 inputs the dc power, and the dc power is boosted through the second phase coil V, the third phase coil W, the second phase arm 122, and the third phase arm 123 in the motor coil 111 to charge the external battery 3.
Alternatively, fourth switch K4, fifth switch K5, first switch K1, second switch K2, third switch K3, and seventh switch K are turned on, sixth switch K6 is turned off, resistor R is precharged, sixth switch K6 is turned on, seventh switch K7 is turned off, and external dc charging port 2 inputs dc power, and the dc power is boosted through first phase coil U, second phase coil V, third phase coil W, first phase arm 121, second phase arm 122, and third phase arm 123 in motor coil 111, and then external battery 3 is charged.
Specifically, when the energy conversion device 1 is in the driving mode, the first switch K1, the second switch K2, the third switch K3, and the sixth switch K6 are turned on, the fourth switch K4, the fifth switch K5, and the seventh switch K are turned off, the external battery 3 outputs direct current, the first phase arm 121 converts the direct current into three-phase alternating current to drive the motor to operate, the second phase coil V and the third phase coil W output the alternating current, and the second phase arm 122 and the third phase arm 123 form a rectifier bridge to convert the alternating current into the direct current to flow back to the external battery 3.
In addition, the energy conversion device 1 can also perform dc discharge through an external dc charging port.
Specifically, when fourth switch K4, fifth switch K5, and sixth switch K6 are turned on and seventh switch K7 is turned off, the switches in first switch module 14 are switched, so that the dc power input from external battery 3 is dc-discharged through external dc charging port 2 by any number of phases of the arm in arm converter 12 and any number of phases of coils in motor coil 111.
It should be noted that, in this embodiment, the principle of the dc discharging operation mode of the energy conversion device 1 is opposite to that of the dc charging operation mode thereof, and therefore, the specific operation principle of the dc discharging operation mode of the energy conversion device 1 may refer to the specific operation process of the dc charging mode thereof, which is not described herein again.
In this embodiment, the energy conversion device 1 provided by the present application integrates the motor 11 and the bridge arm converter 12 into one circuit, so that driving of the motor 11 can be realized by using the bridge arm converter 12, and a bridge arm in the bridge arm converter 12 can be used to cooperate with the motor coil 111, so as to realize dc voltage boost, and at the same time, the energy conversion device 1 can also perform dc charging and discharging and dc charging and discharging of a vehicle battery, so that the bridge arm converter 12 and the motor coil 111 are multiplexed, a circuit structure is simplified, a circuit integration level is improved, a circuit cost is reduced, a circuit volume is reduced, and the circuit structure is simple.
In addition, the energy conversion device 1 provided by the application can work in a direct current charging mode and a direct current discharging mode, so that the application scenes of charging are increased, and the application range is expanded.
As shown in FIG. 7, the present application further contemplates a power system 6, where power system 6 includes energy conversion device 1 and a control module 62.
Specifically, the energy conversion device 1 includes a motor 11 and a motor controller 61, the motor 11 includes a motor coil 111, the motor coil 111 is connected to a second end of the external dc charging port 2, the motor control module 61 includes a bridge arm converter 12, the bridge arm converter 12 includes a first bus terminal, a second bus terminal and a plurality of outgoing lines, the first bus terminal is connected to a first end of the external battery 3, the second bus terminal is respectively connected to a first end of the external dc charging port 2 and a second end of the external battery 3, the bridge arm converter 12 is connected to the motor coil 111 through the plurality of outgoing lines, the control module 62 is configured to control the external battery 3, the bridge arm converter 12 and the motor coil 111 to form a driving circuit for driving the motor 11, and is further configured to control the motor coil 111, the bridge arm converter 12 and the external dc charging port 2 to form a dc charging circuit for charging the external battery 3, the motor coil 111 is shared by the drive circuit and the dc charging circuit of the motor 11.
In this embodiment, the power system 6 including the motor 11 and the motor controller 62 is adopted, so that the power system 6 can operate in a driving mode and a dc charging mode in a time-sharing manner, when the power system is used for driving the motor 11, the external battery 2, the bridge arm converter 12, and the motor coil 111 form a driving circuit for driving the motor 11, and when the power system is used for dc charging, the external dc charging port 2, the motor coil 111, the bridge arm converter 12, and the external battery 3 form a dc charging circuit for charging the external battery, so that the bridge arm converter 12 and the motor coil 111 are multiplexed in the driving circuit and the charging circuit, thereby simplifying a circuit structure, and improving an integration level, and further solving technical problems of low integration level and large occupied space of automobile parts in the prior art.
Further, the energy conversion device 1 in the system 6 further includes a switch module including a first switch module 14, a second switch module 15, a sixth switch K6, and a seventh switch K7, and the control module 62 can control the on/off state of each switch in the switch module.
It should be noted that the first switch module 14, the second switch module 15, the sixth switch K6, and the seventh switch K7 in the switch module can refer to fig. 4, fig. 5, and fig. 6.
The switch module is controlled by the control module 62 to switch between the driving mode and the charging mode. When switched to the drive mode, the external battery 3, the arm inverter 12, and the motor coil 111 form a drive circuit that drives the motor 11.
When switched to the dc charging mode, the external dc charging port 2, the motor coil 111, and the arm converter 12 form a dc charging circuit that charges the external battery 3.
Further, as an embodiment of the present application, the power system further includes an on-board charging module, and the on-board charging module and the motor control module 61 are disposed in the first box. It should be noted that the motor control module 61 and the vehicle-mounted charging module may also be separately disposed in two cases, and are not limited herein.
In this embodiment, the motor control module 61 and the vehicle-mounted charging module are integrated in the first box, so that the overall structure of the power system 6 is more compact, the size of the power system 6 is reduced, and the weight of a vehicle using the power system 6 is reduced.
Further, as an embodiment of the present application, the power system 6 further includes a speed reducer, the speed reducer is dynamically coupled to the motor 11, and the speed reducer and the motor 11 are integrated in the second box.
Further, as an embodiment of the present application, the first box is fixedly connected to the second box.
In specific implementation, the first box and the second box may be connected by any connecting member with a fixing function, or the first box is provided with a fixing member capable of being connected with the second box, or the second box is provided with a fixing member capable of being connected with the first box, which is not limited herein.
In this embodiment, fix first box and second box, can prevent effectively that separation from between first box and the second box to guarantee that can not break down because of the box drops between motor control module 61, the on-vehicle module of charging, speed reducer, the motor 11, improved driving system 6's operational reliability and stability.
It should be noted that, in the present embodiment, the detailed working principle and the detailed working process of the energy conversion device 1, the control module 62 and the switch module in the power system 6 can refer to the foregoing detailed description of the energy conversion device 1, and are not described herein again.
Further, the present application also provides a vehicle that includes the power system 6 described in the above embodiment. The specific working principle of the power system in the vehicle according to the embodiment of the present application can be described in detail with reference to the power system 6, and is not described herein again.
In this application, the vehicle that this application provided is through adopting driving system 6 including on-vehicle module of charging, motor control module 61 and control module 62 for the vehicle is at applied driving system 6, but the time sharing work in drive mode, the direct current mode of charging, and then realizes adopting same circuit structure to carry out the motor drive and the battery charging of vehicle, and the circuit integrated level is high and circuit structure is simple, thereby has solved among the prior art automobile parts integrated level and has hanged down, the big technical problem of occupation space.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (16)

1. An energy conversion device, comprising:
a motor including a motor coil connected to a second end of the external DC charging port;
the bridge arm converter comprises a first bus end, a second bus end and a plurality of outgoing lines, the first bus end is connected with a first end of an external battery, the second bus end is respectively connected with a first end of the external direct current charging port and a second end of the external battery, and the bridge arm converter is connected with the motor coil through the plurality of outgoing lines;
the external battery, the bridge arm converter and the motor coil form a driving circuit for driving the motor;
the motor coil, the bridge arm converter and an external direct current charging port form a direct current charging circuit for charging the external battery;
the motor coil comprises a first-phase coil, a second-phase coil and a third-phase coil, each phase coil comprises N coil branches, first ends of the N coil branches in each phase coil are connected in common and then connected with the bridge arm converter through the outgoing line, second ends of the N coil branches in each phase coil are correspondingly connected with second ends of the N coil branches in the other two-phase coil in a one-to-one mode to form N neutral points, and the external direct-current charging port is connected with the M neutral points; wherein N is an integer greater than 1, and M is a positive integer less than N;
the method for acquiring the M value comprises the following steps:
controlling one phase coil of the motor coils, one phase bridge arm connected with the one phase coil and the external direct current charging port to form a direct current charging circuit for charging the external battery;
calculating the target inductance L of the DC charging circuit by controlling the conducting state of the power switch in the one-phase bridge armneed；
Adjusting the number of the external direct-current charging ports connected with neutral points, controlling the motor coils, the bridge arm converter and the external direct-current charging ports to form a direct-current charging circuit for charging the external battery, and respectively calculating actual inductance values L1, L2 and L3 … under different neutral points;
and determining the number of the external direct current charging ports connected with the neutral point according to the target inductance and the actual inductance, thereby obtaining an M value.
2. The energy conversion device according to claim 1, wherein the target inductance L of the dc charging circuit is calculated by controlling the on-state of the power switch in the one-phase bridge armneedThe method comprises the following steps:
controlling a power switch in the one-phase bridge arm to be conducted, wherein the power switch, the one-phase coil and the external direct current charging port form an energy storage loop, and calculating to obtain the current increment of the one-phase coil;
controlling the one power switch in the one-phase bridge arm to be switched off and the other power switch to be switched on, forming an energy release loop by the one-phase coil, the other power switch and the external battery, and calculating to obtain the current decrement of the one-phase coil;
obtaining the target inductance L of the one-phase coil according to the current increment and the current decrementneed。
3. The energy conversion apparatus according to claim 2, wherein the current increment is obtained by the following formula (1):
Figure FDA0003483380530000021
wherein, Delta IL(+) represents the current increment, L represents the inductance of the one-phase coil, and VIRepresenting the input voltage, V, of said external DC charging portDSRepresents the drain voltage, I, of the power switchLRepresenting the current through said one-phase coil, RLRepresenting the resistance of the coil of one phase, TONRepresenting the time that the one power switch is turned on.
4. The energy conversion apparatus according to claim 3, wherein the current decrement is obtained by the following formula (2):
Figure FDA0003483380530000022
wherein, Delta IL(-) represents said current decrement, L represents inductance of said one-phase coil, VORepresents the output terminal voltage of the external battery, VIRepresenting the input voltage, V, of said external DC charging portdRepresenting the voltage across said further power switch, ILRepresenting the current through said one-phase coil, RLRepresenting the resistance of the coil of one phase, TOFFRepresenting the time that the one power switch is turned off and the other power switch is turned on.
5. The energy conversion apparatus according to claim 4, wherein a linear relationship between an input voltage of the external dc charging port and an output terminal voltage of the battery is obtained in the continuously switched on and off states of the one power switch and the other power switch, and the target inductance value is obtained based on the linear relationship, the target inductance value being obtained by calculation by the following formula (3):
Figure FDA0003483380530000031
wherein L isneedRepresenting the target inductance, VORepresents the output terminal voltage of the battery, VIRepresenting the input voltage of said external DC charging port, D1Representing the duty cycle of the conduction of said one power switch, D2Represents the duty cycle, Δ I, of the turn-off of the power switch1Representing the variation of the input current of the external direct current charging port in the time when the power switch is turned off, and f representing the frequency of the power switch for switching on and off.
6. The energy conversion device according to claim 5, wherein the step of adjusting the number of the external DC charging ports connected to the neutral point, and controlling the motor coil, the bridge arm inverter, and the external DC charging ports to form a DC charging circuit for charging the external battery comprises the steps of calculating actual inductance values L1, L2, and L3 … at different numbers of neutral points, respectively comprises:
calculating actual inductance values under different neutral point numbers by the following formula (4):
Figure FDA0003483380530000032
wherein L represents the actual inductance, V1Representing the input voltage of said external DC charging port, I1Represents t1Current passing at all times, I2Represents t2The current passing at the moment.
7. The energy conversion device of claim 6, wherein determining the number of external DC charging port to neutral connections based on the target inductance and the actual inductance to obtain the M value comprises:
and when the actual inductance is larger than the target inductance, the number of the external direct current charging port connected with the neutral point is the M value.
8. The energy conversion device of claim 1, further comprising a neutral switch for controlling M of the N neutral points of the motor coil to be connected to the external DC charging port.
9. The energy conversion device of claim 8, further comprising a first switching module for controlling connection of each phase coil to the bridge arm converter.
10. The energy conversion device of claim 9, wherein the leg converter comprises a first phase leg, a second phase leg, and a third phase leg, the first switch module comprising a first switch, a second switch, and a third switch;
the first phase bridge arm comprises a first power switch and a second power switch which are connected in series, a first middle point of the first power switch and a first middle point of the second power switch are connected with a first end of the first switch through a first outgoing line, and a second end of the first switch is connected with the first phase coil through the first outgoing line;
the second phase bridge arm comprises a third power switch and a fourth power switch which are connected in series, a second middle point of the third power switch and a second middle point of the fourth power switch are connected with a first end of the second switch through a second outgoing line, and a second end of the second switch is connected with the second phase coil through the second outgoing line;
the third phase bridge arm comprises a fifth power switch and a sixth power switch which are connected in series, a third middle point of the fifth power switch and a third middle point of the sixth power switch are connected with a first end of the third switch through a third outgoing line, and a second end of the third switch is connected with the third phase coil through the third outgoing line;
a first end of the first power switch, a first end of the third power switch and a first end of the fifth power switch are connected in common to form a first bus end of the bridge arm converter;
and a second end of the second power switch, a second end of the fourth power switch and a second end of the sixth power switch are connected in common to form a second bus end of the bridge arm converter.
11. A power system comprising the energy conversion device of any one of claims 1-10 and a control module, wherein the energy conversion device comprises:
a motor including a motor coil connected to a second end of the external DC charging port;
the motor control module comprises a bridge arm converter, the bridge arm converter comprises a first bus end, a second bus end and a plurality of outgoing lines, the first bus end is connected with a first end of an external battery, the second bus end is respectively connected with a first end of the external direct-current charging port and a second end of the external battery, and the bridge arm converter is connected with the motor coil through the plurality of outgoing lines;
the control module is used for controlling the external battery, the bridge arm converter and the motor coil to form a driving circuit for driving the motor, and is also used for controlling the motor coil, the bridge arm converter and the external direct-current charging port to form a direct-current charging circuit for charging the external battery;
the driving circuit of the motor and the direct current charging circuit share the motor coil.
12. The powertrain system of claim 11, wherein the control module is configured to control switching between a dc charging mode and a drive mode;
in the driving mode, the external battery, the bridge arm converter and the motor coil form a driving circuit for driving the motor;
in the dc charging mode, the external dc charging port, the motor coil, and the bridge arm converter form a dc charging circuit that charges the external battery.
13. The power system of claim 11, further comprising an onboard charging module, the motor control module and the onboard charging module being disposed in the first housing.
14. The power system of claim 13, further comprising:
and the speed reducer is in power coupling with the motor, and the speed reducer and the motor are integrated in the second box body.
15. The power system of claim 14, wherein the first case is fixedly coupled to the second case.
16. A vehicle comprising a powertrain according to any one of claims 11-15.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101803147A (en) * 2007-09-10 2010-08-11 丰田自动车株式会社 Accumulator charge control device and charge control method
CN104092273A (en) * 2014-07-25 2014-10-08 中山大洋电机股份有限公司 Electric vehicle driving and charging integrated control method and electric vehicle operated with same
CN105429536A (en) * 2014-09-12 2016-03-23 乐金电子研发中心(上海)有限公司 Integrated starting power generation system
CN106849305A (en) * 2016-11-06 2017-06-13 华北电力大学 A kind of charge-discharge circuit of the vehicle-mounted formula charge power self adaptation of electric automobile
CN110014980A (en) * 2017-08-24 2019-07-16 现代自动车株式会社 Motor driven and battery charger and vehicle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101803147A (en) * 2007-09-10 2010-08-11 丰田自动车株式会社 Accumulator charge control device and charge control method
CN104092273A (en) * 2014-07-25 2014-10-08 中山大洋电机股份有限公司 Electric vehicle driving and charging integrated control method and electric vehicle operated with same
CN105429536A (en) * 2014-09-12 2016-03-23 乐金电子研发中心(上海)有限公司 Integrated starting power generation system
CN106849305A (en) * 2016-11-06 2017-06-13 华北电力大学 A kind of charge-discharge circuit of the vehicle-mounted formula charge power self adaptation of electric automobile
CN110014980A (en) * 2017-08-24 2019-07-16 现代自动车株式会社 Motor driven and battery charger and vehicle

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