Battery charging circuit for portable power tool

Details Battery charging circuit for portable power tool Battery charging circuit for portable power tool

1978-03-29

1980-12-16

Hickey, Robert J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 35, 320 59, 320DIG2, H02J 710

Patent

active

042400228

ABSTRACT:
A battery charging circuit is operable for recharging batteries in both trickle and fast charge modes. The fast charge mode is initiated and maintained by enabling a silicon controlled rectifier in circuit between a current source and the battery. A capacitor maintains the SCR in the operative state until the battery reaches full charge. A thermostatically controlled switch terminates the fast charge mode. The battery is then trickle charged for an indefinite period. Reversion to the fast charge mode is prevented by discharging the capacitor associated with the SCR when the thermostatically controlled switch opens.

REFERENCES:
patent: 3465230 (1969-09-01), Ball
patent: 3518524 (1970-06-01), Roszyk
patent: 3599072 (1971-08-01), Becker
patent: 3748568 (1973-07-01), Ackermann
patent: 3911351 (1975-10-01), Saslow
patent: 3917990 (1975-11-01), Sherman
patent: 3919618 (1975-11-01), Coleman et al.
patent: 3928792 (1975-12-01), Mullersman et al.
patent: 3935525 (1976-01-01), Elson et al.

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