Battery state monitoring circuit and battery device
AssigneeSeiko Instruments Inc.
InventorAtsushi Sakurai
Life of this patent
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Abstract
The present invention provides a safe battery device by preventing oscillation of an external terminal during a discharge limiting state entered due to an instruction from a microcomputer. When a discharge limiting signal is inputted to a battery state monitoring circuit from an exterior, impedance of an over-current monitor terminal is kept constant.
Claims6
A battery state monitoring circuit comprising:
- a DOP terminal for controlling a FET that controls a discharge current of a secondary battery;
- a battery voltage monitor terminal for monitoring a discharge current of the secondary battery;
- a control terminal for receiving a signal controlling charge/discharge from an exterior;
- a VMP terminal for monitoring a over current of the secondary battery;
- a pull-up circuit connected the VMP terminal and the battery voltage monitor terminal;
- an over-current detection circuit received a signal from the VMP terminal;
- an OR circuit for outputting a signal to the DOP terminal, received signals from the VMP terminal and the control monitor terminal;
- and
- a inhibiting circuit for outputting pull-up signal to the circuit pull-up when receives a signal for inhibiting discharge from the control terminal, connected to the output terminal of the over-current detection circuit.
A battery state monitoring circuit comprising:
- a DOP terminal for controlling a FET that controls a discharge current of a secondary battery;
- a battery voltage monitor terminal for monitoring a discharge current of the secondary battery;
- a control terminal for receiving a signal controlling charge/discharge from an exterior;
- a VMP terminal for monitoring a over current of the secondary battery;
- a pull-down circuit connected the VMP terminal and the battery voltage monitor terminal;
- an over-current detection circuit received a signal from the VMP terminal, an NOR circuit for outputting a signal to the DOP terminal, received signals from the VMP terminal and the control monitor terminal;
- and
- a inhibiting circuit for outputting pull-down signal to the circuit pull-down when receives a signal for inhibiting discharge from the control terminal, connected to the output terminal of the over-current detection circuit.
A battery state monitoring circuit capable of controlling a current limiting means for adjusting currents of secondary batteries chargeable/dischargeable and of monitoring one or both of a voltage and a current of the secondary battery, wherein:
- at least a monitor terminal for monitoring a discharge current of the secondary battery and a control terminal for controlling charge/discharge from an exterior are provided in the battery state monitoring circuit;
- and
- in a case where a discharge limiting signal is inputted to the control terminal, the monitor terminal is electrically insulated.
Dependencies are inferred from the claim text.