CN117656892A - Vehicle power supply system and vehicle - Google Patents

Vehicle power supply system and vehicle Download PDF

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Publication number
CN117656892A
CN117656892A CN202211049271.7A CN202211049271A CN117656892A CN 117656892 A CN117656892 A CN 117656892A CN 202211049271 A CN202211049271 A CN 202211049271A CN 117656892 A CN117656892 A CN 117656892A
Authority
CN
China
Prior art keywords
bridge arm
switch
circuit
capacitor
vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211049271.7A
Other languages
Chinese (zh)
Inventor
许兴发
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BYD Co Ltd
Original Assignee
BYD Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BYD Co Ltd filed Critical BYD Co Ltd
Priority to CN202211049271.7A priority Critical patent/CN117656892A/en
Publication of CN117656892A publication Critical patent/CN117656892A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • 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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4241—Arrangements for improving power factor of AC input using a resonant converter
    • 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
    • H02M3/01—Resonant DC/DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • 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
    • H02M7/53875—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 with analogue control of three-phase output
    • 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
    • B60L2210/00—Converter types
    • B60L2210/30—AC to DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The present disclosure relates to a vehicle power supply system and a vehicle. Wherein, the vehicle power supply system includes: the controller, the vehicle-mounted charger, battery pack, voltage conversion circuit and motor control system that connect sequentially; the vehicle-mounted charger comprises an LLC circuit and a bus capacitor; the bus capacitor is respectively connected with the voltage input end of the voltage conversion circuit and the battery pack; and the controller is respectively connected with the LLC circuit and the voltage conversion circuit and is used for controlling the LLC circuit and the voltage conversion circuit to realize the charging of the battery pack when the vehicle-mounted charger works. Therefore, the vehicle-mounted charger and the motor control system can share one voltage conversion circuit, and corresponding voltage conversion circuits are not required to be respectively arranged for the vehicle-mounted charger and the motor control system, so that the integration and miniaturization of a vehicle power supply system can be realized, the vehicle cost is reduced, and the vehicle power density is improved.

Description

Vehicle power supply system and vehicle
Technical Field
The disclosure relates to the technical field of vehicles, in particular to a vehicle power supply system and a vehicle.
Background
The vehicle-mounted charger is an electronic device for converting alternating current into direct current, and is used as a vehicle-mounted charging device for an electric vehicle to charge a battery. The existing vehicle-mounted charger mostly adopts a two-stage topology, wherein the front stage is a power factor correction circuit, the rear stage is an isolated DCDC circuit (LLC (resonant circuit for short)), and the two-stage circuits balance the instantaneous power difference of an alternating current side and a direct current side through bus capacitance.
At present, the voltage conversion circuit of the vehicle-mounted charger is additionally arranged, which is not beneficial to the integration and miniaturization of a vehicle power supply system and also improves the vehicle cost.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides a vehicle power supply system and a vehicle.
To achieve the above object, in a first aspect, the present disclosure provides a vehicle power supply system including:
the controller, the vehicle-mounted charger, the battery pack, the voltage conversion circuit and the motor control system are connected in sequence;
the vehicle-mounted charger comprises an LLC circuit and a bus capacitor;
one end of the LLC circuit is used for being connected with alternating current, and the other end of the LLC circuit is connected with the bus capacitor;
the bus capacitor is respectively connected with the voltage input end of the voltage conversion circuit and the battery pack;
the controller is respectively connected with the LLC circuit and the voltage conversion circuit and is used for controlling the LLC circuit and the voltage conversion circuit to realize the charging of the battery pack when the vehicle-mounted charger works.
Optionally, the controller is configured to control the LLC circuit to convert the alternating current into direct current, and control the voltage conversion circuit to perform power factor correction on the direct current, so as to implement charging of the battery pack.
Optionally, the voltage conversion circuit comprises a first capacitor, N coils and N-phase bridge arms, wherein N is more than or equal to 1;
the first confluence end of the N-phase bridge arm is respectively connected with the first switch and one end of the motor control system, and the second confluence end of the N-phase bridge arm is respectively connected with the second switch, one end of the first capacitor, the other end of the motor control system and the negative electrode of the bus capacitor;
the first ends of the N coils are connected to the middle points of the N-phase bridge arms in a one-to-one correspondence manner, the second ends of the N coils are connected together to form a neutral point, and the neutral point is respectively connected with the third switch and the positive electrode of the bus capacitor;
the other end of the first capacitor is respectively connected with the second end of any one of the N coils and the neutral point;
the positive electrode of the battery pack is connected with the first switch and the third switch respectively, and the negative electrode of the battery pack is connected with the second switch;
the controller is respectively connected with the first switch, the second switch and the third switch, and is used for controlling the first switch and the second switch to be closed, controlling the third switch to be opened, controlling the LLC circuit to convert the alternating current into direct current, controlling the upper bridge arm of the N-phase bridge arm to be opened, and controlling the lower bridge arm of the N-phase bridge arm to be conducted with a preset duty ratio so as to perform power factor correction on the direct current when the vehicle-mounted charger works.
Optionally, the controller is further configured to control, when the motor control system works, the second switch and the third switch to be closed, the first switch to be opened, and control the upper bridge arm and the lower bridge arm of the N-phase bridge arm to act, so as to perform voltage conversion on the voltage of the battery pack, and then supply power to the motor control system.
Optionally, the positive electrode of the battery pack is connected with the first switch through a resistor, and the resistor is connected with a fourth switch in parallel;
the controller is connected with the fourth switch, and is used for controlling the first switch and the second switch to be closed, controlling the third switch and the fourth switch to be opened, and controlling the upper bridge arm and the lower bridge arm of the bridge arm connected with the target coil in the N-phase bridge arm to be connected so as to precharge the first capacitor before the vehicle-mounted charger or the motor control system works, wherein the target coil is a coil connected with the first capacitor in the N coils.
Optionally, the LLC circuit includes an inverter circuit, a resonant circuit, and a rectifier circuit connected in sequence, where the inverter circuit is configured to be connected to an alternating current, and the rectifier circuit is configured to be connected to the bus capacitor.
Optionally, the inverter circuit includes a first phase leg and a second phase leg, the resonant circuit includes a first resonant capacitor, a resonant inductor, a transformer, and a second resonant capacitor, and the rectifier circuit includes a third phase leg and a fourth phase leg;
the first bus ends of the first phase bridge arm and the second phase bridge arm are used for being connected with the positive electrode of the alternating current, and the second bus ends of the first phase bridge arm and the second phase bridge arm are used for being connected with the negative electrode of the alternating current;
the first bus ends of the third phase bridge arm and the fourth phase bridge arm are connected with the positive electrode of the bus capacitor, and the second bus ends of the third phase bridge arm and the fourth phase bridge arm are connected with the negative electrode of the bus capacitor;
one end of the resonant inductor is connected with the middle point of the second phase bridge arm, and the other end of the resonant inductor is connected with the first input end of the primary side of the transformer through the first resonant capacitor;
one end of the second resonance capacitor is connected with the first output end of the secondary side of the transformer, and the other end of the second resonance capacitor is connected with the midpoint of the third phase bridge arm;
the second input end of the primary side is connected with the middle point of the first phase bridge arm, and the second output end of the secondary side is connected with the middle point of the fourth phase bridge arm.
Optionally, the vehicle-mounted charger further comprises a filter circuit, one end of the filter circuit is connected with the alternating current, and the other end of the filter circuit is connected with the inverter circuit.
Optionally, the filter circuit includes a first filter inductor, a second filter inductor and a second capacitor;
one end of the first filter inductor is used for being connected with the positive electrode of the alternating current, and the other end of the first filter inductor is connected with one end of the second capacitor, the first phase bridge arm and the first converging end of the second phase bridge arm respectively;
and one end of the second filter inductor is used for being connected with the negative electrode of the alternating current, and the other end of the second filter inductor is respectively connected with the other end of the second capacitor, the first phase bridge arm and the second converging end of the second phase bridge arm.
In a second aspect, the present disclosure provides a vehicle comprising the vehicle power supply system provided in the first aspect of the present disclosure.
In the technical scheme, the vehicle power supply system comprises a controller, a vehicle-mounted charger, and a battery pack, a voltage conversion circuit and a motor control system which are sequentially connected. The vehicle-mounted charger comprises an LLC circuit and a bus capacitor, wherein one end of the LLC circuit is used for being connected with Alternating Current (AC), the other end of the LLC circuit is connected with the bus capacitor C1, and the bus capacitor C1 is respectively connected with a voltage input end of the voltage conversion circuit and the battery pack; the controller is respectively connected with the LLC circuit and the voltage conversion circuit and is used for controlling the LLC circuit and the voltage conversion circuit to realize the charging of the battery pack when the vehicle-mounted charger works. Therefore, the vehicle-mounted charger and the motor control system can share one voltage conversion circuit, and corresponding voltage conversion circuits are not required to be respectively arranged for the vehicle-mounted charger and the motor control system, so that the integration and miniaturization of the vehicle power supply system can be realized, the vehicle cost is reduced, and the vehicle power density is improved.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
fig. 1 is a block diagram illustrating a configuration of a vehicle power supply system according to an exemplary embodiment.
Fig. 2A is a circuit topology diagram of a vehicle power supply system, according to an example embodiment.
Fig. 2B is a circuit topology diagram of a vehicle power supply system according to another exemplary embodiment.
Fig. 3 is a circuit topology diagram of a vehicle power supply system according to another exemplary embodiment.
Fig. 4 is a circuit topology diagram of a vehicle power supply system according to another exemplary embodiment.
Description of the reference numerals
1. Controller 2 vehicle-mounted charger
3. Motor control system 4 voltage conversion circuit
5. Controller 21 LLC circuit
22. Inverter circuit of filter circuit 211
212. Resonant circuit 213 rectifying circuit
AC C1 bus capacitor
C2 First capacitor C3 first resonance capacitor
C4 Second resonance capacitor C5 second capacitor
C6 Third capacitor 51 motor controller
52. R resistor of motor
KM N coils B1N phase bridge arm
B2 First phase leg B3 second phase leg
B4 Third phase leg B5 fourth phase leg
L1 resonant inductance L2 first filter inductance
L3 second filter inductance T transformer
S1 first switch S2 second switch
S3 third switch S4 fourth switch
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
The present disclosure provides a vehicle power supply system, as shown in fig. 1, which may include a controller 1, an on-vehicle charger 2, and a battery pack 3, a voltage conversion circuit 4, and a motor control system 5, which are sequentially connected.
As shown in fig. 1, the in-vehicle charger 2 includes an LLC circuit 21 and a bus capacitor C1. One end of the LLC circuit 21 is used for being connected with Alternating Current (AC), and the other end of the LLC circuit is connected with a bus capacitor (C1); the bus capacitor C1 is connected to the voltage input terminal of the voltage conversion circuit 4 and the battery pack 3.
The controller 1 is respectively connected with the LLC circuit 21 and the voltage conversion circuit 4 and is used for controlling the LLC circuit 21 and the voltage conversion circuit 4 to realize the charging of the battery pack 3 when the vehicle-mounted charger 2 works; the controller 1 is also configured to control the voltage conversion circuit 4 to convert the voltage of the battery pack 3 into a voltage and supply the voltage to the motor control system 5 when the motor control system 5 is operating. Wherein, the vehicle-mounted charger 2 and the motor control system 5 do not work simultaneously.
In one embodiment, the controller 1 may control the LLC circuit 21 and the voltage conversion circuit 4 by: when the vehicle-mounted charger 2 is in operation, the LLC circuit 21 is controlled to convert Alternating Current (AC) into Direct Current (DC), and the voltage conversion circuit 4 is controlled to perform power factor correction on the Direct Current (DC) so as to realize charging of the battery pack 3.
That is, when the in-vehicle charger 2 is operated, the voltage conversion circuit 4 functions as a power factor correction circuit of the in-vehicle charger 2 to perform power factor correction and voltage conversion; when the motor control system 5 works, the voltage conversion circuit 4 is used as a voltage conversion module of the motor control system 5 and is used for converting the voltage of the battery pack 3 so as to supply power to the motor control system 5.
In the technical scheme, the vehicle power supply system comprises a controller, a vehicle-mounted charger, and a battery pack, a voltage conversion circuit and a motor control system which are sequentially connected. The vehicle-mounted charger comprises an LLC circuit and a bus capacitor, wherein one end of the LLC circuit is used for being connected with Alternating Current (AC), the other end of the LLC circuit is connected with the bus capacitor C1, and the bus capacitor C1 is respectively connected with a voltage input end of the voltage conversion circuit and the battery pack; the controller is respectively connected with the LLC circuit and the voltage conversion circuit and is used for controlling the LLC circuit and the voltage conversion circuit to realize the charging of the battery pack when the vehicle-mounted charger works. Therefore, the vehicle-mounted charger and the motor control system can share one voltage conversion circuit, and corresponding voltage conversion circuits are not required to be respectively arranged for the vehicle-mounted charger and the motor control system, so that the integration and miniaturization of the vehicle power supply system can be realized, the vehicle cost is reduced, and the vehicle power density is improved.
As shown in fig. 2A, 2B, and 4, the motor control system 5 includes a third capacitor C6, a motor controller 51, and a motor 52, which are sequentially connected.
As shown in fig. 2A, 2B and 4, the voltage conversion circuit 4 includes a first capacitor C2, N coils KM, and an N-phase bridge arm B1, where N is equal to or greater than 1.
For example, as shown in fig. 2A, n=1, and in this case, the arm B1 is constituted by a first switching tube Q1 and a second switching tube Q2.
As another example, as shown in fig. 2B and 4, n=2, and the two-phase bridge arm includes a bridge arm constituted by the first switching transistor Q1 and the second switching transistor Q2, and a bridge arm constituted by the third switching transistor Q3 and the fourth switching transistor Q4.
The first bus end of the N-phase bridge arm B1 is connected to the first switch S1 and one end of the motor control system 5 (specifically, one end of the third capacitor C6), and the second bus end of the N-phase bridge arm B1 is connected to the second switch S2, one end of the first capacitor C2, the other end of the motor control system 5 (specifically, the other end of the third capacitor C6), and the negative electrode of the bus capacitor C1. The first ends of the N coils KM are connected to the middle point of the N-phase bridge arm B1 in a one-to-one correspondence mode, the second ends of the N coils KM are connected together to form a neutral point O, and the neutral point O is respectively connected with the third switch S3 and the positive electrode of the bus capacitor C1.
The other end of the first capacitor C2 is respectively connected with the second end of any coil of the N coils KM and the neutral point O.
As shown in fig. 2A, for example, n=1, and the other end of the first capacitor C2 is connected to the second end (also the neutral point O) of the coil KM.
As another example, as shown in fig. 2B and 4, n=2, and the other end of the first capacitor C2 is connected to the second end of the upper coil (i.e., the target coil) and the neutral point O, respectively, wherein the upper coil is a coil connected to a bridge arm formed by the first switching tube Q1 and the second switching tube Q2 among the 2 coils KM.
The positive electrode of the battery pack 3 is respectively connected with the first switch S1 and the third switch S3, and the negative electrode of the battery pack 3 is connected with the second switch S2;
the controller 1 (not shown in fig. 2A, 2B and 4) is respectively connected to the first switch S1, the second switch S2 and the third switch S3, and is configured to control the first switch S1 and the second switch S2 to be closed and the third switch S3 to be opened, and control the LLC circuit 21 to convert AC into dc, and control the upper arm of the N-phase arm B1 to be opened and the lower arm of the N-phase arm B1 to be turned on at a preset duty ratio, so as to perform power factor correction on the dc when the vehicle-mounted charger 2 is operated. The gain of the power factor correction circuit (i.e., the voltage conversion circuit 4) of the vehicle-mounted charger 2 is controlled by controlling the on duty ratio of the lower bridge arm of the N-phase bridge arm B1, so as to realize voltage conversion and power factor correction.
As described above, the controller 1 is also configured to control the voltage conversion circuit 4 to convert the voltage of the battery pack 3 and supply power to the motor control system 5 when the motor control system 5 is operating. Specifically, the controller 1 is further configured to control, when the motor control system 5 is in operation, the second switch S2 and the third switch S3 to be closed, the first switch S1 to be opened, and control the upper and lower bridge arms of the N-phase bridge arm B1 to act, so as to perform voltage conversion on the voltage of the battery pack 3, and then supply power to the motor control system 5.
As shown in fig. 3, the positive electrode of the battery pack 3 is connected with the first switch S1 through a resistor R, and the resistor R is connected with a fourth switch S4 in parallel; the controller 1 is connected with the fourth switch S4, and is configured to control the first switch S1 and the second switch S2 to be closed, and the third switch S3 and the fourth switch S4 to be opened, and control the upper bridge arm and the lower bridge arm of the bridge arm connected with the target coil in the N-phase bridge arm B1 to be opened before the vehicle-mounted charger 2 or the motor control system 5 works, so as to precharge the first capacitor C2, where the target coil is a coil connected with the first capacitor C2 in the N coils KM.
Specifically, before the vehicle-mounted charger 2 or the motor control system 5 works, the first switch S1 and the second switch S2 are controlled to be closed, the third switch S3 and the fourth switch S4 are controlled to be opened, and the upper bridge arm and the lower bridge arm of the N-phase bridge arm B1, which are connected with the target coil, are controlled to be on and off (at this time, the lower bridge arm is used as a freewheel diode) so as to precharge the first capacitor C2, thereby ensuring the safety of the power supply system and the service life of the element.
When the voltage at two ends of the first capacitor C2 reaches a preset precharge voltage threshold and the motor control system 5 enters a working state, the first switch S1 is controlled to be opened and the third switch S3 is controlled to be closed; when the voltage at two ends of the first capacitor C2 reaches a preset precharge voltage threshold and the vehicle-mounted charger 2 enters a working state, the fourth switch S4 is controlled to be closed.
Wherein the above-mentioned preset precharge voltage threshold value may be set to a value close to the voltage of the battery pack 3.
In the above embodiment, the vehicle-mounted charger 2 and the motor control system 5 may share the precharge circuit, without setting corresponding precharge circuits for the vehicle-mounted charger and the motor control system, respectively, so as to further improve integration and miniaturization of the vehicle power supply system, and further reduce vehicle cost.
As shown in fig. 2A, 2B, and 3, the LLC circuit 21 in the vehicle-mounted battery charger 2 includes an inverter circuit 211, a resonant circuit 212, and a rectifier circuit 213, which are sequentially connected, wherein the inverter circuit 211 is configured to be connected to an AC power supply, and the rectifier circuit 213 is configured to be connected to a bus capacitor C1.
Specifically, the inverter circuit 211 includes a first phase leg B2 and a second phase leg B3, wherein the first phase leg B2 is configured by a fifth switching tube Q5 and a sixth switching tube Q6, and the second phase leg B3 is configured by a seventh switching tube Q7 and an eighth switching tube Q8.
The resonant circuit 212 includes a first resonant capacitor C3, a resonant inductor L1, a transformer T, and a second resonant capacitor C4, where the resonant inductor L1 may be magnetically integrated with the transformer T to participate in resonance in the resonant circuit; the first resonance capacitor C3 and the second resonance capacitor C4 can be selected from a thin film capacitor, a ceramic chip capacitor and the like, so that the transformer T is prevented from being biased by direct current, and the transformer T takes part in resonance in a resonance circuit; the transformer T may be a tap transformer for achieving electrical isolation and voltage conversion.
The rectifier circuit 213 is configured to convert an alternating current on the secondary side of the transformer T into a direct current, and specifically includes a third phase leg B4 and a fourth phase leg B5, where the third phase leg B4 is formed by a ninth switching tube Q9 and a tenth switching tube Q10, and the fourth phase leg B5 is formed by an eleventh switching tube Q11 and a twelfth switching tube Q12.
The first bus ends of the first phase bridge arm B2 and the second phase bridge arm B3 are used for being connected with the positive electrode of the alternating current AC, and the second bus ends of the first phase bridge arm B2 and the second phase bridge arm B3 are used for being connected with the negative electrode of the alternating current AC; the first bus ends of the third phase bridge arm B4 and the fourth phase bridge arm B5 are connected with the positive electrode of the bus capacitor C1, and the second bus ends of the third phase bridge arm B4 and the fourth phase bridge arm B5 are connected with the negative electrode of the bus capacitor C1; one end of the resonant inductor L1 is connected with the middle point of the second phase bridge arm B3, and the other end of the resonant inductor L is connected with the first input end of the primary side of the transformer T through the first resonant capacitor C3; one end of the second resonant capacitor C4 is connected with the first output end of the secondary side of the transformer T, and the other end of the second resonant capacitor C4 is connected with the middle point of the third phase bridge arm B4; the second input end of the primary side is connected with the middle point of the first phase bridge arm B2, and the second output end of the secondary side is connected with the middle point of the fourth phase bridge arm B5.
The controller 1 is respectively connected with the first phase bridge arm B2, the second phase bridge arm B3, the third phase bridge arm B4 and the fourth phase bridge arm B5, and is used for controlling the upper bridge arm (namely a fifth switching tube Q5) and the lower bridge arm (namely a sixth switching tube Q6) of the first phase bridge arm B2 to be complementarily conducted and controlling the upper bridge arm (namely a seventh switching tube Q7) and the lower bridge arm (namely an eighth switching tube Q8) of the second phase bridge arm B3 to be complementarily conducted when the vehicle-mounted charger 2 works; meanwhile, the upper bridge arm (namely, the ninth switching tube Q9) and the lower bridge arm (namely, the tenth switching tube Q10) of the third phase bridge arm B4 are controlled to be conducted in a complementary mode, and the upper bridge arm (namely, the eleventh switching tube Q11) and the lower bridge arm (namely, the twelfth switching tube Q12) of the fourth phase bridge arm B5 are controlled to be conducted in a complementary mode.
In addition, in order to avoid the inverter circuit 211 generating high-frequency current to improve the stability of the power supply system of the vehicle, as shown in fig. 4, the vehicle-mounted charger 2 further includes a filter circuit 22, one end of which is connected to the alternating current AC, and the other end of which is connected to the inverter circuit 211.
Specifically, the filter circuit 22 includes a first filter inductor L2, a second filter inductor L3, and a second capacitor C5. One end of the first filter inductor L2 is used for being connected with the positive electrode of Alternating Current (AC), and the other end of the first filter inductor L2 is respectively connected with one end of the second capacitor C5, the first converging ends of the first phase bridge arm B2 and the second phase bridge arm B3; and one end of the second filter inductor L3 is used for being connected with the negative electrode of the alternating current AC, and the other end of the second filter inductor L is respectively connected with the other end of the second capacitor C5, the first phase bridge arm B2 and the second converging end of the second phase bridge arm B3.
Although fig. 2A is illustrated with n=1 as an example, and fig. 2B, 3, and 4 are illustrated with n=2 as an example, it should be understood by those skilled in the art that the number of arms and the number of coils included in the voltage conversion circuit 4 in each of the drawings are only examples.
In addition, the disclosure also provides a vehicle, including the above-mentioned vehicle power supply system that the disclosure provided.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations are not described further in this disclosure in order to avoid unnecessary repetition.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims (10)

1. A vehicle power supply system, characterized by comprising:
the device comprises a controller (1), a vehicle-mounted charger (2), a battery pack (3), a voltage conversion circuit (4) and a motor control system (5) which are sequentially connected;
the vehicle-mounted charger (2) comprises an LLC circuit (21) and a bus capacitor (C1);
one end of the LLC circuit (21) is used for being connected with Alternating Current (AC), and the other end of the LLC circuit is connected with the bus capacitor (C1);
the bus capacitor (C1) is respectively connected with the voltage input end of the voltage conversion circuit (4) and the battery pack (3);
the controller (1) is respectively connected with the LLC circuit (21) and the voltage conversion circuit (4) and is used for controlling the LLC circuit (21) and the voltage conversion circuit (4) to realize the charging of the battery pack (3) when the vehicle-mounted charger (2) works.
2. The vehicle power supply system according to claim 1, characterized in that the controller (1) is configured to control the LLC circuit (21) to convert the Alternating Current (AC) into direct current, and to control the voltage conversion circuit (4) to perform power factor correction on the direct current to achieve charging of the battery pack (3).
3. The vehicle power supply system according to claim 2, characterized in that the voltage conversion circuit (4) comprises a first capacitor (C2), N coils (KM) and N-phase legs (B1), N being equal to or greater than 1;
the first bus end of the N-phase bridge arm (B1) is respectively connected with a first switch (S1) and one end of the motor control system (5), and the second bus end of the N-phase bridge arm (B1) is respectively connected with a second switch (S2), one end of the first capacitor (C2), the other end of the motor control system (5) and the negative electrode of the bus capacitor (C1);
the first ends of the N coils (KM) are connected to the middle point of the N-phase bridge arm (B1) in a one-to-one correspondence manner, the second ends of the N coils (KM) are connected together to form a neutral point (O), and the neutral point (O) is respectively connected with a third switch (S3) and the positive electrode of the busbar capacitor (C1);
the other end of the first capacitor (C2) is respectively connected with the second end of any coil (KM) in the N coils and the neutral point (O);
the positive electrode of the battery pack (3) is respectively connected with the first switch (S1) and the third switch (S3), and the negative electrode of the battery pack (3) is connected with the second switch (S2);
the controller (1) is respectively connected with the first switch (S1), the second switch (S2) and the third switch (S3), and is used for controlling the first switch (S1) and the second switch (S2) to be closed and the third switch (S3) to be opened, controlling the LLC circuit (21) to convert Alternating Current (AC) into direct current, controlling the upper bridge arm of the N-phase bridge arm (B1) to be opened and the lower bridge arm of the N-phase bridge arm (B1) to be conducted with a preset duty ratio so as to perform power factor correction on the direct current when the vehicle-mounted charger (2) works.
4. A vehicle power supply system according to claim 3, characterized in that the controller (1) is further configured to control, when the motor control system (5) is in operation, the second switch (S2) and the third switch (S3) to be closed, the first switch (S1) to be opened, and control the upper and lower arms of the N-phase arm (B1) to act so as to perform voltage conversion on the voltage of the battery pack (3) and then supply power to the motor control system (5).
5. The vehicle power supply system according to claim 4, characterized in that the positive pole of the battery pack (3) is connected with the first switch (S1) through a resistor (R), the resistor (R) being connected in parallel with a fourth switch (S4);
the controller (1) is connected with the fourth switch (S4) and is used for controlling the first switch (S1) and the second switch (S2) to be closed, the third switch (S3) and the fourth switch (S4) to be opened, and controlling the upper bridge arm of the bridge arm connected with the target coil in the N-phase bridge arm (B1) to be conducted and the lower bridge arm to be disconnected before the vehicle-mounted charger (2) or the motor control system (5) works, so as to precharge the first capacitor (C2), wherein the target coil is a coil connected with the first capacitor (C2) in the N coils (KM).
6. The vehicle power supply system according to any one of claims 1-5, characterized in that the LLC circuit (21) comprises an inverter circuit (211), a resonant circuit (212) and a rectifying circuit (213) connected in sequence, wherein the inverter circuit (211) is for connection with an Alternating Current (AC), and the rectifying circuit (213) is for connection with the busbar capacitance (C1).
7. The vehicle power supply system according to claim 6, characterized in that the inverter circuit (211) comprises a first phase leg (B2) and a second phase leg (B3), the resonant circuit (212) comprises a first resonant capacitor (C3), a resonant inductor (L1), a transformer (T) and a second resonant capacitor (C4), and the rectifier circuit (213) comprises a third phase leg (B4) and a fourth phase leg (B5);
the first bus ends of the first phase bridge arm (B2) and the second phase bridge arm (B3) are used for being connected with the positive electrode of the Alternating Current (AC), and the second bus ends of the first phase bridge arm (B2) and the second phase bridge arm (B3) are used for being connected with the negative electrode of the Alternating Current (AC);
the first bus ends of the third phase bridge arm (B4) and the fourth phase bridge arm (B5) are connected with the positive electrode of the bus capacitor (C1), and the second bus ends of the third phase bridge arm (B4) and the fourth phase bridge arm (B5) are connected with the negative electrode of the bus capacitor (C1);
one end of the resonant inductor (L1) is connected with the middle point of the second phase bridge arm (B3), and the other end of the resonant inductor is connected with the first input end of the primary side of the transformer (T) through the first resonant capacitor (C3);
one end of the second resonance capacitor (C4) is connected with the first output end of the secondary side of the transformer (T), and the other end of the second resonance capacitor is connected with the middle point of the third phase bridge arm (B4);
the second input of the primary side is connected to the middle point of the first phase leg (B2), and the second output of the secondary side is connected to the middle point of the fourth phase leg (B5).
8. The vehicle power supply system according to claim 7, characterized in that the on-board charger (2) further comprises a filter circuit (22) having one end for connection with the Alternating Current (AC) and the other end for connection with the inverter circuit (211).
9. The vehicle power supply system according to claim 8, characterized in that the filter circuit (22) comprises a first filter inductance (L2), a second filter inductance (L3) and a second capacitance (C5);
one end of the first filter inductor (L2) is used for being connected with the positive electrode of the Alternating Current (AC), and the other end of the first filter inductor is connected with one end of the second capacitor (C5), and the first converging ends of the first phase bridge arm (B2) and the second phase bridge arm (B3) respectively;
and one end of the second filter inductor (L3) is used for being connected with the negative electrode of the Alternating Current (AC), and the other end of the second filter inductor is respectively connected with the other end of the second capacitor (C5), the first phase bridge arm (B2) and the second converging end of the second phase bridge arm (B3).
10. A vehicle characterized by comprising a vehicle power supply system according to any one of claims 1-9.
CN202211049271.7A 2022-08-30 2022-08-30 Vehicle power supply system and vehicle Pending CN117656892A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101976871A (en) * 2010-10-22 2011-02-16 艾默生网络能源有限公司 UPS (Uninterrupted Power Supply) power supply control circuit and UPS power supply
CN111478408A (en) * 2020-05-22 2020-07-31 广州视源电子科技股份有限公司 Three-bridge-arm topology device, control method and uninterruptible power supply system
CN112224051A (en) * 2019-06-30 2021-01-15 比亚迪股份有限公司 Vehicle and energy conversion device and power system thereof
CN112440766A (en) * 2019-08-29 2021-03-05 比亚迪股份有限公司 Electric automobile and charging system thereof
CN213861886U (en) * 2020-11-25 2021-08-03 上海威迈斯新能源有限公司 Integrated vehicle-mounted charger with wide-range output

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101976871A (en) * 2010-10-22 2011-02-16 艾默生网络能源有限公司 UPS (Uninterrupted Power Supply) power supply control circuit and UPS power supply
CN112224051A (en) * 2019-06-30 2021-01-15 比亚迪股份有限公司 Vehicle and energy conversion device and power system thereof
CN112440766A (en) * 2019-08-29 2021-03-05 比亚迪股份有限公司 Electric automobile and charging system thereof
CN111478408A (en) * 2020-05-22 2020-07-31 广州视源电子科技股份有限公司 Three-bridge-arm topology device, control method and uninterruptible power supply system
CN213861886U (en) * 2020-11-25 2021-08-03 上海威迈斯新能源有限公司 Integrated vehicle-mounted charger with wide-range output

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