Battery protecting circuit

Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging

Reexamination Certificate

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Details

C320S136000

Reexamination Certificate

active

11383517

ABSTRACT:
This invention provides a battery protecting circuit where even if the battery voltage falls nearly to zero volts due to overdischarge or the like while an NMOS transistor set in the power feeding path on the side of the positive electrode of the battery is turned ON/OFF, it is still possible to charge the battery by a constant charging current in a stable way. When the voltage of battery B1has not reached the voltage needed for generating the driving voltage of NMOS transistors Q1, Q2in drives111, 112, the boosting operation of drives111, 112is stopped, and PMOS transistor Q3inserted in a power feeding path different from that of said transistors is turned ON by driver113. In driver113, by clamping voltage VDD generated in the power feeding path of PMOS transistor Q3to a voltage lower than it, driving voltage ZVO of PMOS transistor Q3is generated without performing a boosting operation.

REFERENCES:
patent: 6850040 (2005-02-01), Xiong et al.
patent: 6888468 (2005-05-01), Bertness

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