Charging circuit for battery in thermostat with battery operated

Details Charging circuit for battery in thermostat with battery operated Charging circuit for battery in thermostat with battery operated

1979-05-11

1981-02-10

Wayner, William E.

Automatic temperature and humidity regulation

With timing element

Timer other than clock

307 66, F23N 520, H02J 700

Patent

active

042496969

ABSTRACT:
A timer controlled space thermostat includes a battery operated timer and charging circuit means for continuously charging the battery. The charging circuit means includes a miniature transformer having two primary windings and one secondary winding wound on a single core. When a thermostat switch therein is closed to effect energizing of space conditioning apparatus, one of the primary windings induces a stepped-up voltage and stepped-down current in the secondary winding to effect charging the battery. When the thermostat switch is open, the other primary winding induces a stepped-down voltage and stepped-up current in the secondary winding to effect charging the battery.

REFERENCES:
patent: 3293445 (1966-12-01), Levy
patent: 3711747 (1933-01-01), Sahara et al.
patent: 3769571 (1933-10-01), Wilkinson
patent: 3948441 (1976-04-01), Perkins et al.
patent: 4177923 (1979-12-01), Krump
Honeywell Memo, Exhibit F22, 6/13/63.

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