Charging terminal shortcircuit preventing circuit for battery pa

Details Charging terminal shortcircuit preventing circuit for battery pa Charging terminal shortcircuit preventing circuit for battery pa

1997-04-02

1998-08-11

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Cell or battery charger structure

For battery pack

320163, H02J 700, H02J 706

Patent

active

057931860

ABSTRACT:
A charging terminal shortcircuit preventing circuit for a battery pack, capable of firmly preventing a shortcircuit and with employing a simple structure. In a battery pack so constructed that a charge current is supplied from a charger via a charging terminal to a battery, and a current is supplied from the battery via an output terminal to a portable appliance, and further the current from the charger via a through-input terminal and a through-output terminal to the portable appliance, there are provided a switch 22 for turning ON/OFF the charge current between the battery 21 and the charge terminal T.sub.4, and switch operating means for detecting an application of a voltage to the through-input terminal T.sub.6 to thereby turn ON the switch 22. Also, in a battery pack 2, a resistor having a large resistance value is connected parallel to the switch 22, and a battery pack mount detecting means of the charger 3 detects a voltage at the charging terminal T.sub.4 of the battery pack in order to detect mounting of the battery pack 2.

REFERENCES:
patent: 3735233 (1973-05-01), Ringle
patent: 4709201 (1987-11-01), Schaefer et al.
patent: 4920307 (1990-04-01), Iketani
patent: 5177426 (1993-01-01), Nakanishi et al.
patent: 5200690 (1993-04-01), Uchida
patent: 5465039 (1995-11-01), Narita et al.
patent: 5477130 (1995-12-01), Hashimoto et al.
patent: 5493197 (1996-02-01), Eguchi et al.

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