Emergency lighting system AC line voltage sensing

Details Emergency lighting system AC line voltage sensing Emergency lighting system AC line voltage sensing

1975-08-25

1977-06-14

Beha, Jr., William H.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

315 86, H05B 3704

Patent

active

040300137

ABSTRACT:
An emergency lighting system includes a high reactance transformer with a primary winding for connection to AC line voltage and a secondary winding. Circuit means are provided for monitoring the AC line voltage and includes means for coupling the transformer secondary winding to a non-linear load, a battery, during one AC half cycle and means for coupling the secondary winding to a linear load during an alternate AC half cycle to provide a DC voltage proportional to the AC line voltage.

REFERENCES:
patent: 2650339 (1953-08-01), Christie et al.
patent: 3659179 (1972-04-01), Barker et al.
patent: 3790810 (1974-02-01), Rogers et al.
patent: 3836815 (1974-09-01), Herzog
patent: 3868562 (1975-02-01), Marshall
patent: 3875421 (1975-04-01), Anshus
patent: 3900783 (1975-08-01), Herzog et al.

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