Battery voltage detection circuit

Details Battery voltage detection circuit Battery voltage detection circuit

2011-03-22

2011-03-22

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Capacitor charging or discharging

C320S148000, C320S149000, C320S156000, C320S157000, C320S162000, C307S109000, C307S112000, C307S130000, C307S131000, C363S059000, C363S074000, C363S076000, C363S084000

Reexamination Certificate

active

07911185

ABSTRACT:
A battery-voltage detection circuit comprising: a first-capacitor; an operational-amplifier; a second-capacitor; a voltage-application-circuit to sequentially apply one and the other-battery-terminal-voltages to the other-first-capacitor-end; a discharge circuit to allow the second-capacitor to discharge before the other-battery-terminal-voltage is applied to the other-first-capacitor-end; a constant current circuit to output a constant-current causing predetermined-speed-discharge of electric charge accumulated in the second-capacitor in response to a discharge-start-signal input after voltage is applied to the other-first-capacitor-end; a comparator; and a measurement-circuit to measure a time-period from a time when the discharge-start-signal is input until a time when an comparator-output-signal changes to one logic level as a time-period corresponding to a battery-voltage, at least one of the operational-amplifier and the comparator being provided with an offset so that the comparator-output-signal changes to the one logic level when voltage applied to the other operational-amplifier input terminal is at a predetermined level lower than a reference-voltage level.

REFERENCES:
patent: 6621273 (2003-09-01), Takada et al.
patent: 2001/0054881 (2001-12-01), Watanabe
patent: 2005/0104560 (2005-05-01), Pai
patent: 2005/0285573 (2005-12-01), Cheng
patent: 2006/0170463 (2006-08-01), Yonezawa et al.
patent: 2002-243771 (2002-08-01), None

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