Heater control system

Details Heater control system Heater control system

1992-10-27

1994-05-03

Paschall, Mark H.

Electric heating

Heating devices

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

219486, 219413, 219519, 219494, H05B 102

Patent

active

053089570

ABSTRACT:
A control system for dual oven resistance heaters (BAKE, BROIL) has opposite sides of each heater connected to a common side of one of a pair of SPDT switching relays such that no current flows to the heaters when both relays are in a common state of energization/de-energization. A microcomputer receives a signal from the oven temperature sensing and signals separate switching devices to selectively energize/de-energize one of the relays to switch on the desired heater. Separate comparators also receive the temperature sensor signal; and, in the event of failure of the microcomputer or switching devices with a heater "ON", the comparator is operative to bring the relays to a common state, preventing current flow to either heater.

REFERENCES:
patent: 2675455 (1954-04-01), Richardson
patent: 5015827 (1991-05-01), Kadwell et al.

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