Vehicle electrical system

Patent metadata

Field	Value
Publication number	US-12576733-B2
Application number	US-202217853448-A
Country	US
Kind code	B2
Filing date	Jun 29, 2022
Priority date	Feb 13, 2020
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

A vehicle electrical system includes: an electrical storage system, a first multiphase electrical machine having stator windings, and a first inverter connected to the electrical storage system and the first multiphase electrical machine, the first inverter has a plurality of switch legs with switches; a second multiphase electrical machine having stator windings, and a second inverter connected to the electrical storage system and the second multiphase electrical machine, the second inverter has a plurality of switch legs with switches; and a terminal having poles that receive single-phase AC or multi-phase AC or DC from a vehicle charging source, a first line connects a first pole of the terminal with a first switch leg of the first inverter, a second conductive line connects a second pole of the terminal with a first switch leg of the second inverter, and a first inductor in the first or second conductive lines.

First claim

What is claimed is:

1 . A vehicle electrical system comprising:
an electrical storage system, a first multiphase electrical machine having a plurality of stator windings, a first inverter connected to the electrical storage system and to the first multiphase electrical machine, wherein the first inverter has a plurality of switch legs with switches, a second multiphase electrical machine having a plurality of stator windings, a second inverter connected to the electrical storage system and to the second multiphase electrical machine, wherein the second inverter has a plurality of switch legs with switches, a terminal having a plurality of poles and configured for receiving single-phase AC or multi-phase AC or DC from a vehicle external charging source, a first conductive line connecting a first pole of the terminal with a first switch leg of the first inverter, a second conductive line connecting a second pole of the terminal with a first switch leg of the second inverter, a first inductor arranged in one of the first and second conductive lines, and a control system operatively coupled to the first and second inverters and configured for controlling operation of the switches of the first and second inverters for preventing charging current from passing through any of the stator windings of the first and second multiphase electrical machines during transfer of electrical charge from the vehicle external charging source to the electrical storage system.

2 . The vehicle electrical system according to claim 1 , wherein when the control system is configured for charging the electrical storage system using electrical energy supplied from the vehicle external charging source in a voltage step-up mode, the control system is configured to operate a first switch of the first switch leg of the first inverter with alternating on and off periods, such that a charging current during an on-period flows from the vehicle external charging source, through the first conductive line, the first switch of the first switch leg of the first inverter, an intrinsic or extrinsic reverse diode associated with a first switch of the first switch leg of the second inverter, the second conductive line, the first inductor, and back to the vehicle external charging source, while bypassing the electrical storage system, and such that a charging current during an off-period flows from a negative pole of the electrical storage system, through the intrinsic or extrinsic reverse diode associated with the first switch of the first switch leg of the second inverter, the second conductive line, the first inductor, the vehicle external charging source, the first conductive line, an intrinsic or extrinsic reverse diode associated with a second switch of the first switch leg of the first inverter, to a positive pole of the electrical storage system.

3 . The vehicle electrical system according to claim 2 , wherein when the vehicle external charging source is AC for charging the electrical storage system in a voltage step-up mode, the control system selectively controls operation of the first switch leg of the first inverter and the first switch leg of the second inverter, such that electric current flow alternates between:
flowing through the first switch of the first switch leg of the first inverter for charging the electrical storage system during a first supply voltage polarity state, and flowing through the first switch of the first switch leg of the second inverter for charging the electrical storage system during a second supply voltage polarity state.

4 . The vehicle electrical system according to claim 1 , wherein the vehicle electrical system further comprises:
a first supply switch arranged in one of the first and second conductive lines and configured for selectively opening and closing said first or second conductive line, and a step-down switch operatively connected to the first and second conductive lines and configured for selectively opening and closing a connection between said first or second conductive lines, wherein the first supply switch, the step-down switch and the first inductor are arranged to allow current flow between a portion of the first conductive line and a portion of the second conductive line via the step-down switch and the first inductor when the first supply switch is in an open state.

5 . The vehicle electrical system according to claim 4 , wherein when the control system is configured for charging the electrical storage system using electrical energy supplied from the vehicle external charging source in a voltage step-down mode, the control system is configured to operate the first supply switch and the step-down switch synchronized and with alternating on and off periods.

6 . The vehicle electrical system according to claim 4 , wherein when the control system is configured for charging the electrical storage system using electrical energy supplied from the vehicle external charging source in a voltage step-down mode, the control system is configured to set the first supply switch in a closed state when the step-down switch is set in an open state, and oppositely.

7 . The vehicle electrical system according to claim 4 , wherein when the control system is configured for charging the electrical storage system using electrical energy supplied from the vehicle external charging source in a voltage step-down mode, the control system is configured to keep all switches of the first and second inverters in an open state.

8 . The vehicle electrical system according to claim 4 , wherein when the control system is configured for charging the electrical storage system using electrical energy supplied from the vehicle external charging source in a voltage step-down mode, the control system is configured to operate the first supply switch and the step-down switch, such that a charging current during an on-period of the first supply switch flows from a negative pole of the electrical storage system, through the intrinsic or extrinsic reverse diode associated with a first switch of the first switch leg of the second inverter, the second conductive line, the first inductor, the vehicle external charging source, the first conductive line, an intrinsic or extrinsic reverse diode associated with a second switch of the first switch leg of the first inverter, and to a positive pole of the electrical storage system.

9 . The vehicle electrical system according to claim 4 , wherein when the control system is configured for charging the electrical storage system using electrical energy supplied from the vehicle external charging source in a voltage step-down mode, the control system is configured to operate the first supply switch and the step-down switch, such that a charging current during an on-period of the step-down switch flows from a negative pole of the electrical storage system, through the intrinsic or extrinsic reverse diode associated with a first switch of the first switch leg of the second inverter, the second conductive line, the first inductor, the step-down switch, the first conductive line, an intrinsic or extrinsic reverse diode associated with a second switch of the first switch leg of the first inverter, and to a positive pole of the electrical storage system.

10 . The vehicle electrical system according to claim 4 , wherein when the control system is configured for charging the electrical storage system using AC electrical energy supplied from the vehicle external charging source in a voltage step-down mode, the control system is configured to operate the first supply switch and the step-down switch, such that a charging current alternates between:
flowing through the intrinsic or extrinsic reverse diode

Assignees

• Ningbo Geely Automobile Res & Development Co Ltd
• Geely Holding Group Co Ltd
• Ningbo Geely Automobile Res & Dev Co Ltd

Inventors

• Haghbin Saeid

Classifications

• H02J7/90

  Regulation of charging or discharging current or voltage · CPC title

• H02J7/02 Primary

  for charging batteries from AC mains by converters · CPC title

• B60L2220/40

  Electrical machine applications · CPC title

• B60L2210/40

  DC to AC converters · CPC title

• B60L53/24

  Using the vehicle's propulsion converter for charging · CPC title