Protection circuit for a battery charger

Details Protection circuit for a battery charger Protection circuit for a battery charger

1988-01-04

1989-09-19

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 93, 320 25, 320 33, H52H 3087

Patent

active

048687065

ABSTRACT:
A protection circuit for a battery charger for safely charging a battery from a remote electrical power supply is disclosed. The protection circuit includes a power control means responsive to input from the remote power supply; an overload sensing means responsive to the power control means and to the negative polarity of the battery; a main switching means responsive to the overload sensing means and to the power control means wherein the main switching means controllably limits current output in the presence of a slight overload condition, and deactuates the battery charger in the presence of a large overload condition. An indicating means, such as a light emitting diode is preferably disposed between the power control means and the main switching means, to signal when the battery is being properly charged, and is deactuated when a short circuit occurs across the positive and negative terminals of the battery, or when the polarity is reversed at the battery terminals, or when the battery charger deactuates due to an overload condition.

REFERENCES:
patent: 3816804 (1974-06-01), Cardwell, Jr.
patent: 4086524 (1978-04-01), Kremer
patent: 4233553 (1980-11-01), Prince, Jr. et al.

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