Battery pack with a remaining battery power calculating function
AssigneeSeiko Instruments Inc.
InventorsMinoru Sudo, Takashi Niwa, Norio Chiba, Susumu Ichihara
Life of this patent
Estimating the term…
Abstract
A battery pack has a secondary battery connected to a plus side terminal. A protective circuit protects the secondary battery from overcharge and over-discharge. A calculation circuit operates with a minus side terminal as a reference for calculating a remaining capacity of the secondary battery. An N-channel MOS transistor is connected between the secondary battery and the minus terminal for controlling charge and discharge of the secondary battery in accordance with a signal from the protective circuit. A level shifter circuit is connected between the calculation circuit and a communication terminal.
Claims16
A battery pack with a remaining battery power calculating function, comprising:
- a secondary battery connected to a plus side terminal;
- a protective circuit for protecting the secondary battery from overcharge and over-discharge;
- a calculation circuit operating with a minus side terminal as a reference for calculating a remaining capacity of the secondary battery;
- an N-channel MOS transistor connected between the secondary battery and the minus terminal for controlling charge and discharge of the secondary battery upon receiving a signal from the protective circuit in order to protect the secondary battery;
- and
- a level shifter circuit connected between the calculation circuit and a communication terminal.
A battery pack with a remaining battery power calculating function, the battery pack comprising:
- a plus side terminal;
- a minus side terminal;
- a secondary battery connected to the plus side terminal;
- a protection circuit for protecting the secondary battery from overcharge and over-discharge;
- a calculation circuit that uses a minus side electric potential of the secondary battery as a reference to calculate a remaining capacity of the secondary battery;
- an N-channel MOS transistor connected between the secondary battery and the minus side terminal for controlling charge and discharge of the secondary battery in accordance with a signal from the protection circuit;
- and
- a level shifter circuit connected between the calculation circuit and a communication terminal for shifting an electric potential of the minus side terminal to the minus side electric potential of the secondary battery.
A battery pack with a remaining battery power calculating function, the battery pack comprising:
- a plus side terminal;
- a minus side terminal;
- a secondary battery connected to the plus side terminal;
- a protection circuit for protecting the secondary battery from overcharge and over-discharge;
- a calculation circuit that uses a minus side electric potential of the secondary battery as a reference to calculate a remaining capacity of the secondary battery;
- an N-channel MOS transistor connected between the secondary battery and the minus side terminal for controlling charge and discharge of the secondary battery in accordance with a signal from the protection circuit;
- and
- a level shifter circuit connected between the calculation circuit and a communication terminal for shifting an electric potential of the minus side of the secondary battery to an electric potential of the minus side terminal.
Dependencies are inferred from the claim text.