Battery charging circuit for portable power tool

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

H - Electricity

02

J

320/11

H02J 7/00 (2006.01)

Patent

CA 1128989

BATTERY CHARGING CIRCUIT FOR PORTABLE POWER TOOL Abstract of the Disclosure 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.

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