Protection circuit for lithium battery pack serving as tool...

Details Protection circuit for lithium battery pack serving as tool... Protection circuit for lithium battery pack serving as tool...

2006-10-13

2009-02-03

Berhane, Adolf (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

C361S093100

Reexamination Certificate

active

07486049

ABSTRACT:
A protection circuit for a lithium battery pack that serves as a power source of a power tool is arranged in the lithium battery pack and connected among a reversal/forward rotation circuit, a speed variation circuit, and a motor of the power tool. During a discharging process, the protection circuit detects battery voltage and temperature and when abnormal events occur, the protection circuit cuts off the discharge current. The protection circuit has a simple structure, low costs, and is easy to incorporate to the currently existing pressing-control circuit of the power tool.

REFERENCES:
patent: 6577883 (2003-06-01), Ueda
patent: 2005/0088147 (2005-04-01), Svensson et al.
patent: 2005/0134227 (2005-06-01), Wozniak
patent: 2005/0242779 (2005-11-01), Yoshio

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