Positive power-off circuit for electrical appliances

Details Positive power-off circuit for electrical appliances Positive power-off circuit for electrical appliances

1990-03-21

1990-12-25

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219493, 219519, 219508, 99281, H05B 102

Patent

active

049805401

ABSTRACT:
A power-off control circuit for a household appliance, including a manually operating momentary switch having conductive and non-conductive states. The switch is connected to a source of electric power so when the switch is momentarily manually operated into the conductive state, power flows into the power-off control circuit. There is a power regulator connected to the manually operating switch for receiving the power during the conductive state and for converting the received power into a voltage. A timer is connected to the power regulator and when activated, initiates a predetermined time period in which the household appliance operates. The circuit also includes a relay connected to the timer and the source of electrical power so as to be in parallel with the manually operating switch. The relay operates in a conductive and non-conductive state and is in the non-conductive state until receiving a signal from the timer at which time the relay changes to the conductive state. Now, the power regulator receives power through the relay until the relay changes to the non-conductive state and power is prevented from flowing through the power-off circuit.

REFERENCES:
patent: 4046217 (1977-09-01), Magnuson
patent: 4245148 (1981-01-01), Gisske et al.
patent: 4330702 (1982-05-01), Cheng
patent: 4376243 (1983-03-01), Renn et al.
patent: 4406217 (1983-09-01), Oota
patent: 4418614 (1983-12-01), Oota et al.
patent: 4547657 (1985-10-01), Sticher, Jr. et al.
patent: 4566802 (1986-01-01), Koehler

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