Battery life extending power-switching device for all-time opera

Details Battery life extending power-switching device for all-time opera Battery life extending power-switching device for all-time opera

1998-11-25

2000-03-07

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Battery or cell charging

Plural charging sources

307 44, H02J 700

Patent

active

06034508&

ABSTRACT:
A power-source-switching device automatically capable of directing power from a battery or an external power source to an all-time circuit. When the external power source is connected, a switching circuit directs the external power source to the all-time circuit. On the other hand, when the external power source is disconnected, the switching circuit is able to direct power from the battery to the all-time circuit. Since the conventional diode connection is replaced by a switching circuit, a voltage drop across the diode due to forward bias is avoided. Consequently, the battery can work at a lower voltage level, thereby extending the working life of a battery.

REFERENCES:
patent: 5187425 (1993-02-01), Tanikawa
patent: 5287053 (1994-02-01), Hutchingson
patent: 5477126 (1995-12-01), Shiojima
patent: 5617009 (1997-04-01), Takao et al.

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