Battery charger failure alarm circuit

Details Battery charger failure alarm circuit Battery charger failure alarm circuit

1982-09-28

1984-04-03

Shoop, William M.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 59, H02J 704

Patent

active

044410662

ABSTRACT:
A battery charger failure alarm circuit for use with a battery charger including a source of rectified AC voltage for charging a battery and a filtering inductor serially interposed between said charger circuit and battery and across which there appears AC ripple voltage so long as the battery charger is functioning properly, includes a sensing circuit coupled to the filtering inductor for sensing the presence of the AC ripple voltage and an alarm circuit coupled to the sensing circuit operable to indicate the failure of the battery charger circuit in response to a lack of sensed AC ripple voltage. A time delay circuit may be included in the battery charger failure alarm circuit between the sensing circuit and alarm circuit to delay the operation of the alarm circuit in the case of momentary loss of the AC ripple voltage.

REFERENCES:
patent: 3457491 (1969-07-01), Black et al.
patent: 3746961 (1973-07-01), Dobie
patent: 4242674 (1980-12-01), Wheeler

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