Charging circuit

Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries

Patent

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Details

Other Related Categories

363 37, 363142, H02J 710, H02M 5458

Type

Patent

Status

active

Patent number

046331590

Description

ABSTRACT:
A charging circuit comprises a bypassing transistor connected at the collector and base respectively to the base and emitter of a switching transistor connected to the primary winding of a transformer for inducing a charging current in the secondary winding of the transformer forming a part of a secondary battery charging path, and a current detecting resistance and constant voltage element connected between the base and emitter of the bypassing transistor so that, when the peak of a collector current of the switching transistor exceeds a predetermined level, the bypassing transistor is conducted to bypass and reduce the base current of the switching transistor, the collector current of the switching transistor is thereby reduced, and the charging current substantially constant at the average value is generated regardless of the voltage of a selective one of different power sources.

REFERENCES:
patent: 3869657 (1975-03-01), Shoji et al.
patent: 4284944 (1981-08-01), Iwanaga et al.
patent: 4422032 (1983-12-01), Kakumoto et al.
patent: 4551666 (1985-11-01), Wada et al.

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