Auxiliary power supply device and electric vehicle

Patent metadata

Field	Value
Publication number	US-2020369164-A1
Application number	US-202016874734-A
Country	US
Kind code	A1
Filing date	May 15, 2020
Priority date	May 22, 2019
Publication date	Nov 26, 2020
Grant date	—

Abstract

An auxiliary power supply device includes an auxiliary power supply; and an auxiliary power supply control unit configured to switch a mode of the auxiliary power supply to an output mode or a non-output mode when electric power is output from a main power supply to a drive motor. The auxiliary power supply control unit is configured to switch the mode to the non-output mode when a required power value required by the drive motor is equal to or smaller than a predetermined power value and to switch the mode to the output mode when the required power value is larger than the predetermined power value, the predetermined power value being set to a value smaller than outputtable electric power that is electric power outputtable from the main power supply.

First claim

What is claimed is:

1 . An auxiliary power supply device configured to be mounted in an electric vehicle including a drive motor configured to generate a driving force required for the electric vehicle to travel, and a main power supply configured to output electric power to the drive motor such that the electric vehicle travels, the auxiliary power supply device comprising:
an auxiliary power supply configured to output the electric power along a flow of the electric power from the main power supply to the drive motor; and an auxiliary power supply control unit configured to switch a mode of the auxiliary power supply to an output mode or a non-output mode when the electric power is output from the main power supply to the drive motor, the output mode being a mode in which the electric power is output from the auxiliary power supply, and the non-output mode being a mode in which the electric power is not output from the auxiliary power supply, wherein the auxiliary power supply control unit is configured to switch the mode to the non-output mode when a required power value required by the drive motor is equal to or smaller than a predetermined power value and to switch the mode to the output mode when the required power value is larger than the predetermined power value, the predetermined power value being set to a value smaller than outputtable electric power that is electric power outputtable from the main power supply.

2 . The auxiliary power supply device according to claim 1 , wherein in the non-output mode, the auxiliary power supply is charged with the electric power output from the main power supply.

3 . The auxiliary power supply device according to claim 1 , wherein in the non-output mode, the auxiliary power supply is charged with the electric power that is generated by a generator based on operation of an engine.

4 . An electric vehicle comprising:
the auxiliary power supply device according to claim 1 ; a main power supply device including the main power supply and a main power supply control unit configured to control output of the electric power from the main power supply to the drive motor; and the drive motor.

5 . The electric vehicle according to claim 4 , further comprising:
an engine; and a generator configured to generate the electric power based on operation of the engine, wherein at least one of the main power supply and the auxiliary power supply is charged with the electric power generated by the generator.

Assignees

• Jtekt Corp

Inventors

• Sugiyama Toyoki
• Nishi Koji
• Sawada Shinichi
• Mio Takumi
• Sato Fumihiko
• Shinoda Satoshi
• Komatsubara Yukihiro

Classifications

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• B60L50/15

  with additional electric power supply (with capacitors charged by engine-driven generators B60L50/40; with batteries charged by engine-driven generators B60L50/61) · CPC title

• B60L50/40

  using propulsion power supplied by capacitors · CPC title

• B60L50/66 Primary

  Arrangements of batteries · CPC title

• B60L50/60 Primary

  using power supplied by batteries (in combination with fuel cells B60L50/75) · CPC title