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CN-121989725-A - Vehicle-mounted charger and control method thereof

CN121989725ACN 121989725 ACN121989725 ACN 121989725ACN-121989725-A

Abstract

The embodiment of the application provides a vehicle-mounted charger and a control method thereof. The vehicle-mounted charger comprises a PFC circuit, an AC port, a first switch switching circuit, a V2L port, a second switch switching circuit and a controller, wherein a live wire end of the AC port is connected with a positive input end of the PFC circuit through the first switch switching circuit, a zero wire end of the AC port is connected with a negative input end of the PFC circuit through a third switch switching circuit, the V2L port is connected with the PFC circuit through the second switch switching circuit, the third switch switching circuit is located between a common joint formed by the second switch switching circuit and the negative input end of the PFC circuit and the zero wire end of the AC port, and the controller is used for enabling the vehicle-mounted charger to enter a corresponding working mode by controlling the first switch switching circuit, the second switch switching circuit and the third switch switching circuit according to a received working mode instruction. The method is used for solving the contradiction between the discharge safety requirement and the withstand voltage test requirement.

Inventors

  • LIU JUNWEN
  • WANG BANGWEI

Assignees

  • 苏州汇川联合动力系统股份有限公司

Dates

Publication Date
20260508
Application Date
20260104

Claims (13)

  1. 1. A vehicle-mounted charger, comprising: The Power Factor Correction (PFC) circuit, an Alternating Current (AC) port, a first switch switching circuit, a V2L port, a second switch switching circuit and a controller; the live wire end of the AC port is connected with the positive input end of the PFC circuit through the first switch switching circuit, and the zero wire end of the AC port is connected with the negative input end of the PFC circuit through the third switch switching circuit; The V2L port is connected with the PFC circuit through the second switch switching circuit, and the third switch switching circuit is positioned between a common joint formed by the second switch switching circuit and the negative input end of the PFC circuit and the zero line end of the AC port; The controller is connected with the first switch switching circuit, the second switch switching circuit and the third switch switching circuit respectively and is used for: According to the received working mode instruction, the vehicle-mounted charger enters a corresponding working mode by controlling the first switch switching circuit, the second switch switching circuit and the third switch switching circuit, wherein the working mode comprises one or more of a voltage withstand test mode, an in-vehicle discharging mode, an out-vehicle discharging mode and an in-vehicle and out-vehicle simultaneous discharging mode.
  2. 2. The vehicle-mounted charger of claim 1, wherein the AC port comprises a first fire wire end, a second fire wire end and a third fire wire end, wherein the first fire wire end is connected with a first bus of the PFC circuit, the second fire wire end is connected with a second bus of the PFC circuit, the third fire wire end is connected with a third bus of the PFC circuit, the common junction is connected with a ground wire of the PFC circuit, a first inductor is arranged on the first bus in series, a second inductor is arranged on the second bus in series, and a third inductor is arranged on the third bus in series.
  3. 3. The vehicle-mounted charger of claim 1, wherein the AC port comprises a first live wire end, the first live wire end is connected with a first bus of the PFC circuit and a second bus of the PFC circuit, the common junction is connected with a ground line of the PFC circuit, a first inductor is arranged on the first bus in series, and a second inductor is arranged on the second bus in series.
  4. 4. The vehicle-mounted charger of claim 2 wherein the first switch switching circuit comprises switch K1, switch K3, switch K4, switch K5, switch K8 and switch K10; The switch K1 is arranged on the first bus in series, the switch K3 is arranged between the first bus and the second bus, the switch K4 is arranged on the second bus in series, and the switch K5 is arranged on the third bus in series; A switch K8 is arranged between the ground wire of the PFC circuit and the common connection point, a first end of the switch K8 is connected to the common connection point, a second end of the switch K8 is connected to the ground wire of the PFC circuit, and a third end of the switch K8 is connected to the third bus; a switch K10 is arranged at two ends of the third inductor in parallel; the controller is respectively connected with the control ends of the switch K1, the switch K3, the switch K4, the switch K5, the switch K8 and the switch K10.
  5. 5. The vehicle-mounted charger of claim 4, wherein, The second switch switching circuit comprises a switch K6, a first end of the switch K6 is connected with a zero line end of the V2L port, a second end of the switch K6 is connected with the common contact point, a third end of the switch K6 is connected with a live line end of the V2L port, and a fourth end of the switch K6 is connected with a first bus; The controller is connected with the control end of the switch K6.
  6. 6. The vehicle-mounted charger of claim 5, wherein, The third switch switching circuit comprises a switch K9, wherein the switch K9 is connected in series between a zero line end of the AC port and the common connection point; The controller is connected with the control end of the switch K9.
  7. 7. The vehicle-mounted charger according to claim 3, wherein, The first switch switching circuit comprises a switch K1, wherein the switch K1 is arranged on the first bus in series; The controller is connected with the control end of the switch K1.
  8. 8. The vehicle-mounted charger of claim 7, wherein, The second switch switching circuit comprises a switch K6, a first end of the switch K6 is connected with a zero line end of the V2L port, a second end of the switch K6 is connected with the common contact point, a third end of the switch K6 is connected with a live line end of the V2L port, and a fourth end of the switch K6 is connected with a first bus; The controller is connected with the control end of the switch K6.
  9. 9. The vehicle-mounted charger of claim 8, wherein, The third switch switching circuit comprises a switch K9, wherein the switch K9 is connected in series between a zero line end of the AC port and the common connection point; The controller is connected with the control end of the switch K9.
  10. 10. The vehicle-mounted charger of claim 6 wherein the PFC circuit further comprises a capacitance module Cx3 and a switch K7; The first bus, the second bus and the third bus are all connected with the ground wire of the PFC circuit through the capacitor module Cx3 and the switch K7, and the control end of the switch K7 is connected with the controller; The controller is further configured to control the switch K7 to be turned off when the received operation mode is a single-phase mode or a two-phase mode, and control the switch K7 to be turned on when the received operation mode is the rest mode.
  11. 11. The vehicle-mounted charger according to any one of claims 1 to 10, further comprising a pre-charging circuit; the pre-charging circuit is connected with the first switch switching circuit in parallel; The controller is connected with the pre-charging circuit and used for controlling the first switch switching circuit to be disconnected and the pre-charging circuit to be conducted when the power is on, so that the pre-charging circuit is connected with the PFC circuit.
  12. 12. The vehicle-mounted charger according to claim 11, wherein the precharge circuit comprises a precharge resistor and a switch K2; The pre-charging resistor and the switch K2 are connected in series to form a series structure, and the controller is connected with the control end of the switch K2; the controller is specifically configured to control on or off of the precharge circuit by controlling on or off of the switch K2.
  13. 13. A control method of a vehicle-mounted charger, characterized in that the method is based on a vehicle-mounted charger according to any one of claims 1 to 12, comprising: Receiving a working mode instruction; According to the received working mode instruction, the vehicle-mounted charger enters a corresponding working mode by controlling the first switch switching circuit, the second switch switching circuit and the third switch switching circuit, wherein the working mode comprises one or more of a voltage withstand test mode, an in-vehicle discharging mode, an out-vehicle discharging mode and an in-vehicle and out-vehicle simultaneous discharging mode.

Description

Vehicle-mounted charger and control method thereof Technical Field The application relates to the power electronic technology, in particular to a vehicle-mounted charger and a control method thereof. Background Along with development of electric vehicles, in order to meet the demands of users on various vehicle-mounted charging and discharging scenes, a vehicle-mounted charger capable of simultaneously meeting the functions of charging, in-vehicle discharging and out-vehicle discharging compatible with different power grids is needed, and when the vehicle-mounted charger discharges, physical isolation of a circuit between an in-vehicle discharging port and an out-vehicle discharging port needs to be realized, so that electric shock risks of human bodies in different charging and discharging scenes are prevented. The existing vehicle-mounted charger can meet the safety requirement of physical isolation of a loop between an in-vehicle discharging port and an out-vehicle discharging port, and can lead to complete disconnection of the out-vehicle discharging port and an internal high-voltage circuit, so that when a single product is subjected to a voltage withstand test, high voltage cannot be injected into the internal circuit, the voltage withstand test is not covered fully, and insulation risks exist when the product works normally. Disclosure of Invention The embodiment of the application provides a vehicle-mounted charger and a control method thereof, which can solve the contradiction between the discharge safety requirement and the voltage withstand test requirement, ensure that a port has no charged risk when the vehicle-mounted charger discharges inside and outside a vehicle, and simultaneously ensure that external high voltage can be injected into an internal high-voltage circuit of the vehicle-mounted charger when a single voltage withstand test is carried out, so that an internal high-voltage network of the vehicle-mounted charger can be subjected to voltage withstand verification. In a first aspect, an embodiment of the present application provides a vehicle-mounted charger, including: The Power Factor Correction (PFC) circuit, an Alternating Current (AC) port, a first switch switching circuit, a V2L port, a second switch switching circuit and a controller; the live wire end of the AC port is connected with the positive input end of the PFC circuit through the first switch switching circuit, and the zero wire end of the AC port is connected with the negative input end of the PFC circuit through the third switch switching circuit; The V2L port is connected with the PFC circuit through the second switch switching circuit, and the third switch switching circuit is positioned between a common joint formed by the second switch switching circuit and the negative input end of the PFC circuit and the zero line end of the AC port; The controller is connected with the first switch switching circuit, the second switch switching circuit and the third switch switching circuit respectively and is used for: According to the received working mode instruction, the vehicle-mounted charger enters a corresponding working mode by controlling the first switch switching circuit, the second switch switching circuit and the third switch switching circuit, wherein the working mode comprises one or more of a voltage withstand test mode, an in-vehicle discharging mode, an out-vehicle discharging mode and an in-vehicle and out-vehicle simultaneous discharging mode. The AC port comprises a first wire end, a second wire end and a third wire end, wherein the first wire end is connected with a first bus of the PFC circuit, the second wire end is connected with a second bus of the PFC circuit, the third wire end is connected with a third bus of the PFC circuit, the common connection point is connected with a ground wire of the PFC circuit, a first inductor is arranged on the first bus in series, a second inductor is arranged on the second bus in series, and a third inductor is arranged on the third bus in series. Optionally, the AC port includes a first wire end, the first wire end is connected with a first bus of the PFC circuit and a second bus of the PFC circuit, the common connection point is connected with a ground wire of the PFC circuit, a first inductor is serially arranged on the first bus, and a second inductor is serially arranged on the second bus. Optionally, the first switch switching circuit comprises a switch K1, a switch K3, a switch K4, a switch K5, a switch K8 and a switch K10; The switch K1 is arranged on the first bus in series, the switch K3 is arranged between the first bus and the second bus, the switch K4 is arranged on the second bus in series, and the switch K5 is arranged on the third bus in series; A switch K8 is arranged between the ground wire of the PFC circuit and the common connection point, a first end of the switch K8 is connected to the common connection point, a second end of the switch K8 is co