Charge-discharge control circuit, charge-discharge control device, and battery device

Patent metadata

Field	Value
Publication number	US-11245279-B2
Application number	US-202016792612-A
Country	US
Kind code	B2
Filing date	Feb 17, 2020
Priority date	Feb 21, 2019
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

A charge-discharge control circuit includes a positive power-supply terminal; a negative power-supply terminal; a charge-discharge discrimination circuit which discriminates a discharging state in which a discharging current flows and a charging state in which a charging current flows based on a voltage at a charge-discharge path and a preset charge-discharge discrimination voltage; and a control circuit which turns on a discharge control FET and a charge control FET in a charge-inhibition state and the discharging state or turns off the charge control FET in the charge-inhibition state and the charging state.

First claim

What is claimed is:

1. A charge-discharge control circuit, comprising:
a positive power-supply terminal;
a negative power-supply terminal;
a charge-discharge discrimination circuit configured to discriminate a discharging state in which a discharging current flows and a charging state in which a charging current flows based on a voltage at a charge-discharge path and a preset charge-discharge discrimination voltage; and
a control circuit configured to:
turn on a discharge control FET and a charge control FET when in a charge-inhibition state and in the discharging state; and
turn off the charge control FET when in the charge-inhibition state and in the charging state.

2. The charge-discharge control circuit according to claim 1 , wherein the charge-discharge discrimination voltage is set to a voltage at the negative power-supply terminal.

3. The charge-discharge control circuit according to claim 1 , wherein the charge-discharge discrimination voltage is set to a voltage at the positive power-supply terminal.

4. A charge-discharge control device, comprising:
a discharge control FET configured to control discharging;
a charge control FET configured to control charging; and
the charge-discharge control circuit according to claim 1 .

5. A battery device, comprising:
a battery; and
the charge-discharge control device configured to control charging and discharging of the battery according to claim 4 .

6. A charge-discharge control circuit, comprising:
a positive power-supply terminal;
a negative power-supply terminal;
a charge-discharge discrimination circuit configured to discriminate a charging state in which a charging current flows and a discharging state in which a discharging current flows based on a voltage in a charge-discharge path and a preset charge-discharge discrimination voltage; and
a control circuit configured to:
turn on a discharge control FET and a charge control FET when in a discharge-inhibition state and in the charging state; and
turn off the discharge control FET when in the discharge-inhibition and in the discharging state.

7. The charge-discharge control circuit according to claim 6 , wherein the charge-discharge discrimination voltage is set to a voltage at the negative power-supply terminal.

8. The charge-discharge control circuit according to claim 6 , wherein the charge-discharge discrimination voltage is set to a voltage at the positive power-supply terminal.

9. A charge-discharge control device, comprising:
a discharge control FET configured to control discharging;
a charge control FET configured to control charging; and
the charge-discharge control circuit according to claim 6 .

10. A battery device, comprising:
a battery; and
the charge-discharge control device configured to control charging and discharging of the battery according to claim 9 .

Assignees

• Ablic Inc

Inventors

• Abe Satoshi
• Maetani Fumihiko

Classifications

• H02J7/977

  of the battery · CPC title

• H02J7/80 Primary

  including monitoring or indicating arrangements · CPC title

• H02J7/96 Primary

  in response to battery voltage · CPC title

• H02J7/663

  using battery or load disconnect circuits (H02J9/002 takes precedence) · CPC title

• H02J7/865 Primary

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