Low leakage low dropout transistor charging circuit

Details Low leakage low dropout transistor charging circuit Low leakage low dropout transistor charging circuit

1998-08-07

2000-08-15

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

Regulated discharging

320137, 320112, 323277, 361 82, 361 84, H02J 700, H02H 318

Patent

active

061041688

ABSTRACT:
A charging circuit for charging a battery is disclosed. The charging circuit includes a power transistor having a charging terminal for connection to a charger, and a battery terminal for connection to the battery. Further, the charging circuit includes a shunt transistor connected between the battery and a control terminal of the power transistor. The shunt transistor prevents saturation of the power transistor when the charging source is disconnected from the charging terminal and the battery is in a charged state. This prevents leakage of current from the battery through the power transistor. The charging circuit further includes a diode connected between the charging terminal and a shunt control input of the shunt transistor. The diode, along with a voltage divider which divides the charging voltage, maintains the shunt transistor in a non-conductive state when the charger is connected to the charging terminal. When the charger is connected to the charging terminal, a controller turns on the power transistor through a control transistor.

REFERENCES:
patent: 4857985 (1989-08-01), Miller
patent: 5764465 (1998-06-01), Mattes et al.
patent: 5835989 (1998-10-01), Nagai
patent: 5917336 (1999-06-01), Smith et al.

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