CN-117526480-B - Energy conversion circuit and vehicle

CN117526480BCN 117526480 BCN117526480 BCN 117526480BCN-117526480-B

Abstract

The application discloses an energy conversion circuit and a vehicle, and belongs to the technical field of charge and discharge circuits. The energy conversion circuit comprises a charging interface, a first motor unit, a second motor unit, a boosting DC module and a battery module, wherein the charging interface is used for providing input voltage for the energy conversion circuit, a voltage input end of the first motor unit and a voltage input end of the second motor unit are connected to a voltage output end of the boosting DC module through transformers, the energy conversion circuit is provided with a first state for charging the battery module and a second state for driving external equipment through the boosting DC module, the first motor unit and the second motor unit, one or more bridge arms of the first motor unit and the second motor unit are configured as PFC modules, and in the second state, the bridge arms of the first motor unit and the second motor unit are configured as driving modules.

Inventors

LIU ZHENJUAN
LI WEICHENG
SHI LEI
ZHAO BEIPING
XUE PENGHUI

Assignees

比亚迪股份有限公司

Dates

Publication Date: 20260505
Application Date: 20220729

Claims (10)

1. The energy conversion circuit is characterized by comprising a charging interface, a first motor unit, a second motor unit, a boosting DC module and a battery module, The charging interface is connected with the first motor unit and the second motor unit and is used for providing input voltage for the energy conversion circuit; The first motor unit, the second motor unit, the boosting DC module and the battery module are sequentially connected, and the voltage input end of the first motor unit and the voltage input end of the second motor unit are connected to the voltage output end of the boosting DC module through a transformer; The energy conversion circuit has a first state of charging the battery module and a second state of external device driving by the boost DC module, the first motor unit, and the second motor unit, wherein the first motor unit and the second motor unit each include a plurality of legs, one or more of the legs of the first motor unit and the second motor unit are configured as PFC modules in the first state of the energy conversion circuit, and the legs of the first motor unit and the second motor unit are configured as driving modules in the second state of the energy conversion circuit.
2. The energy conversion circuit of claim 1, further comprising a filter, wherein the charging interface is coupled to a first input and a second input of the filter, wherein a first output of the filter is coupled to the first motor unit, and wherein a second output of the filter is coupled to the second motor unit; The first motor unit comprises a first controller and a first motor, the second motor unit comprises a second controller and a second motor, the first controller and the second controller are respectively provided with a three-phase bridge arm, and the first motor and the second motor are respectively provided with a three-phase winding; one end of each winding of the first motor is connected with each bridge arm of the first controller in a one-to-one correspondence manner, and the other end of each winding of the first motor is connected with each other to serve as a first connecting point; One end of each winding of the second motor is connected with each bridge arm of the second controller in a one-to-one correspondence manner, and the other end of each winding of the second motor is connected with each other to serve as a second connection point; Any bridge arm of the first controller is connected with the voltage input end of the first motor unit, and any bridge arm of the second controller is connected with the voltage input end of the second motor unit.
3. The energy conversion circuit of claim 2, wherein the three-phase leg of the first controller comprises a first leg, a second leg, and a third leg, the third leg being connected to the voltage input of the first motor unit, the three-phase leg of the second controller comprises a fourth leg, a fifth leg, and a sixth leg, the fourth leg being connected to the voltage input of the second motor unit; A first switch is arranged between the third bridge arm and the three-phase winding connected with the third bridge arm, a second switch is arranged between the fourth bridge arm and the three-phase winding connected with the fourth bridge arm, and the first switch and the second switch are in an off state when the energy conversion circuit is in a first state; In a second state of the energy conversion circuit, the first switch and the second switch are in a conductive state.
4. The energy conversion circuit of claim 3, wherein, A first output end of the filter is connected to the first connection point, and a second output end of the filter is connected to the second connection point; and in the first state of the energy conversion circuit, the first bridge arm and the second bridge arm of the first controller, and the fifth bridge arm and the sixth bridge arm of the second controller are configured as PFC modules.
5. The energy conversion circuit of claim 3, wherein, A first output end of the filter is connected to the first bridge arm, and a second output end of the filter is connected to the fifth bridge arm; The first leg of the first controller and the sixth leg of the second controller are configured as PFC modules when the energy conversion circuit is in the first state.
6. The energy conversion circuit of claim 4, wherein the power source is configured to provide power to the power source, And a first inductor is also arranged between the second output end of the filter and the second connecting point.
7. The energy conversion circuit of claim 5, wherein the power source is configured to provide power to the power source, And a second inductor is also arranged between the second output end of the filter and the fifth bridge arm.
8. The energy conversion circuit according to claim 3 or 4 or 5 or 6 or 7, A third switch and a fourth switch are further arranged between the charging interface and the filter, one end of the third switch is connected with the first output end of the charging interface, and the other end of the first switch is connected with the first input end of the filter; One end of the fourth switch is connected with the second output end of the charging interface, and the other end of the fourth switch is connected with the second input end of the filter; The third switch and the fourth switch are in a conducting state when the energy conversion circuit is in a first state; In a second state of the energy conversion circuit, the third switch and the fourth switch are in an off state.
9. The energy conversion circuit of claim 1, wherein the power source is configured to provide power to the power source, The first end of the transformer is connected with the first motor unit through a fifth switch, the second end of the transformer is connected with the boosting DC module through a sixth switch, In a first state of the energy conversion circuit, the fifth switch and the sixth switch are in a conducting state; In a second state of the energy conversion circuit, the fifth switch and the sixth switch are in an off state.
10. A vehicle comprising an energy conversion circuit according to any one of claims 1 to 9.

Description

Energy conversion circuit and vehicle Technical Field The application belongs to the technical field of charge and discharge circuits, and particularly relates to an energy conversion circuit and a vehicle. Background The energy conversion mode of the electric automobile comprises a charging mode for charging the electric automobile and a mode for starting the electric automobile through a battery pack in the electric automobile, wherein the electric automobile comprises a charging circuit and a driving circuit in circuit design, and the charging circuit and the driving circuit in the existing circuit are two independent circuits. In the working period, the charging working period and the driving working period are not overlapped, so that two circuits of charging and driving are caused, at least one part of the circuits are not working, the waste of devices is caused, and the overall cost of the vehicle is increased. Disclosure of Invention The application aims to provide an energy conversion circuit and a vehicle, which can solve the problem that the utilization rate of the energy conversion circuit device of the existing electric automobile is not high. The application provides an energy conversion circuit which comprises a charging interface, a first motor unit, a second motor unit, a boosting DC module and a battery module, wherein the charging interface is connected with the first motor unit and the second motor unit, the charging interface is used for providing input voltage for the energy conversion circuit, the first motor unit, the second motor unit, the boosting DC module and the battery module are sequentially connected, the voltage input end of the first motor unit and the voltage input end of the second motor unit are connected to the voltage output end of the boosting DC module through transformers, the energy conversion circuit is in a first state for charging the battery module and a second state for driving external equipment through the boosting DC module, the first motor unit and the second motor unit comprise a plurality of bridge arms, in a first state of the energy conversion circuit, the first motor unit and the second motor unit or the bridge arms are connected to the voltage output end of the boosting DC module through transformers, and in a second state of the energy conversion circuit is configured as a second state of the power conversion circuit, and the first state of the bridge arms and the second state of the power conversion circuit are configured as the power conversion circuit. Optionally, the energy conversion circuit further includes a filter, the charging interface is connected to a first input end and a second input end of the filter, a first output end of the filter is connected to the first motor unit, and a second output end of the filter is connected to the second motor unit; The first motor unit comprises a first controller and a first motor, the second motor unit comprises a second controller and a second motor, the first controller and the second controller are respectively provided with a three-phase bridge arm, and the first motor and the second motor are respectively provided with a three-phase winding; one end of each winding of the first motor is connected with each bridge arm of the first controller in a one-to-one correspondence manner, and the other end of each winding of the first motor is connected with each other to serve as a first connecting point; One end of each winding of the second motor is connected with each bridge arm of the second controller in a one-to-one correspondence manner, and the other end of each winding of the second motor is connected with each other to serve as a second connection point; Any bridge arm of the first controller is connected with the voltage input end of the first motor unit, and any bridge arm of the second controller is connected with the voltage input end of the second motor unit. Optionally, the three-phase bridge arm of the first controller includes a first bridge arm, a second bridge arm and a third bridge arm, the third bridge arm is connected with the voltage input end of the first motor unit, the three-phase bridge arm of the second controller includes a fourth bridge arm, a fifth bridge arm and a sixth bridge arm, the fourth bridge arm is connected with the voltage input end of the second motor unit, a first switch is arranged between the third bridge arm and the three-phase winding connected with the third bridge arm, a second switch is arranged between the fourth bridge arm and the three-phase winding connected with the fourth bridge arm, the first switch and the second switch are in an off state when the energy conversion circuit is in a first state, and the first switch and the second switch are in an on state when the energy conversion circuit is in a second state. Optionally, a first output end of the filter is connected to the first connection point, a second output end of the filter is connected to