Voltage detection device and electric vehicle including...

Details Voltage detection device and electric vehicle including... Voltage detection device and electric vehicle including...

2006-08-08

2009-08-11

Ullah, Akm E (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

C320S136000, C320S162000, C320S166000, C324S433000

Reexamination Certificate

active

07573238

ABSTRACT:
A voltage detection device for accurately correcting detection errors with voltage greater than an internal reference voltage. The device includes a first switch group of switches for obtaining the voltage across a battery block in a battery pack. A charge-discharge unit has two or more capacitors connected in series or in parallel. A voltage detector detects discharge voltage of the capacitors. In a first period, the capacitors are series-connected and charged with the voltage of the battery block. In a second period, the capacitors charged in the first period are series-connected and discharged, and the voltage detector detects the discharge voltage. In a third period, the capacitors are parallel-connected and each capacitor is charged with an internal reference voltage. In the fourth period, the capacitors charged in the third period are series-connected and discharged, and the detection error is corrected using the discharge voltage as a reference.

REFERENCES:
patent: 5712568 (1998-01-01), Flohr et al.
patent: 2004/0001996 (2004-01-01), Sugimoto
patent: 2004/0041569 (2004-03-01), Furukawa
patent: 2002-040064 (2002-02-01), None

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