Vehicle power supply system

Patent metadata

Field	Value
Publication number	US-12097783-B2
Application number	US-202217970671-A
Country	US
Kind code	B2
Filing date	Oct 21, 2022
Priority date	Oct 29, 2021
Publication date	Sep 24, 2024
Grant date	Sep 24, 2024

Abstract

A vehicle power supply system includes a first secondary battery, a second secondary battery whose output voltage is lower than that of the first secondary battery, a power conversion device configured to convert an input AC voltage into a DC voltage and output the DC voltage, a battery pack configured to receive the DC power output from the power conversion device and charge the first secondary battery, DC/DC converters configured to step down an input DC voltage to output the stepped-down DC voltage, and a power control unit configured to control the battery pack. The first secondary battery is connected to input ports of the DC/DC converters via the battery pack. An output port of the DC/DC converter is connected to a video media control unit, and the DC/DC converter is provided separately from the video media control unit. An output port of the DC/DC converter is connected to the second secondary battery.

First claim

What is claimed is:

1. A vehicle power supply system comprising:
a first secondary battery configured to supply power to a traction motor;
a second secondary battery whose output voltage is lower than that of the first secondary battery and which is configured to supply power to a trip computer and a device related to traveling of a vehicle;
a DC power supply unit configured to convert an AC voltage input from a charger, into a DC voltage to output the DC voltage;
a battery pack configured to receive the DC voltage output from the DC power supply unit and charge the first secondary battery housed inside;
a first step-down circuit configured to step down the DC voltage input from the battery pack to output the stepped-down DC voltage;
a second step-down circuit configured to step down the DC voltage input from the battery pack to output the stepped-down DC voltage; and
a control device configured to manage the outputs of the first step-down circuit and the second step-down circuit which have received the inputs from the battery pack,
the first secondary battery being connected to an input port of the first step-down circuit and an input port of the second step-down circuit via a bus in the battery pack,
an output port of the first step-down circuit being connected to a non trip computer of the vehicle which participates in grid computing outside the vehicle,
an output port of the second step-down circuit being connected to the second secondary battery, and
when the charger is connected to the DC power supply unit, the vehicle operates in a first mode in which the first secondary battery is charged, but participation in the grid computing is not performed.

2. The vehicle power supply system of claim 1 , wherein
the control device has a control mode of controlling the battery pack to supply an output of the DC power supply unit to the first secondary battery.

3. The vehicle power supply system of claim 1 , wherein
the control device has a control mode of controlling the battery pack to supply the output of the DC power supply unit to the trip computer.

4. The vehicle power supply system of claim 1 , wherein
the control device has a control mode of supplying a power of the second secondary battery to the trip computer in a case where the power of the second secondary battery is equal to or greater than a predetermined value.

5. The vehicle power supply system of claim 1 , wherein
the control device has a control mode of stepping down the output of the first secondary battery by the second step-down circuit and supplying an output of the second step-down circuit to the second secondary battery.

6. The vehicle power supply system of claim 1 , wherein
the control device receives power supply from the first step-down circuit.

7. A vehicle power supply system comprising:
a first secondary battery configured to supply power to a traction motor;
a second secondary battery whose output voltage is lower than that of the first secondary battery and which is configured to supply power to a trip computer and a device related to traveling of a vehicle;
a DC power supply unit configured to convert an AC voltage input from a charger, into a DC voltage to output the DC voltage;
a battery pack configured to receive the DC voltage output from the DC power supply unit and charge the first secondary battery housed inside;
a first step-down circuit configured to step down the DC voltage input from the battery pack to output the stepped-down DC voltage;
a second step-down circuit configured to step down the DC voltage input from the battery pack to output the stepped-down DC voltage; and
a control device configured to manage the outputs of the first step-down circuit and the second step-down circuit which have received the inputs from the battery pack,
the first secondary battery being connected to an input port of the first step-down circuit and an input port of the second step-down circuit via a bus in the battery pack,
an output port of the first step-down circuit being connected to a non trip computer of the vehicle which participates in grid computing outside the vehicle,
an output port of the second step-down circuit being connected to the second secondary battery,
when the charger is connected to the DC power supply unit, the vehicle operating in a charging and grid computing mode, in which charging of the first secondary battery and participation in the grid computing are both performed.

8. A vehicle power supply system comprising:
a first secondary battery configured to supply power to a traction motor;
a second secondary battery whose output voltage is lower than that of the first secondary battery and which is configured to supply power to a trip computer and a device related to traveling of a vehicle;
a DC power supply unit configured to convert an AC voltage input from a charger, into a DC voltage to output the DC voltage;
a battery pack configured to receive the DC voltage output from the DC power supply unit and charge the first secondary battery housed inside;
a first step-down circuit configured to step down the DC voltage input from the battery pack to output the stepped-down DC voltage;
a second step-down circuit configured to step down the DC voltage input from the battery pack to output the stepped-down DC voltage; and
a control device configured to manage the outputs of the first step-down circuit and the second step-down circuit which have received the inputs from the battery pack,
the first secondary battery being connected to an input port of the first step-down circuit and an input port of the second step-down circuit via a bus in the battery pack,
an output port of the first step-down circuit being connected to a non trip computer of the vehicle which participates in grid computing outside the vehicle,
an output port of the second step-down circuit being connected to the second secondary battery,
when the charger is connected to the DC power supply unit, the vehicle operating in a non-charging and grid computing mode, in which the first secondary battery is not charged but participation in the grid computing is performed.

Assignees

• Mazda Motor

Inventors

• Ishibashi Masato
• Matsukawa Takeshi
• Yoshitake Shinsuke
• Hamano Daisuke
• Hirose Shingo
• Yoshida Keita

Classifications

• H02J2105/37

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

• H02J7/855

  with circuits adapted for supplying loads from the battery · CPC title

• H02J7/50 Primary

  acting upon multiple batteries simultaneously or sequentially · CPC title

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• B60Y2200/91

  Electric vehicles · CPC title