Microprocessor power relay control circuit for a microwave oven

Details Microprocessor power relay control circuit for a microwave oven Microprocessor power relay control circuit for a microwave oven

1986-07-23

1988-01-12

Pellinen, A. D.

Electric heating

Metal heating

Of cylinders

219501, 219506, H05B 668

Patent

active

047193263

ABSTRACT:
A power relay control circuit for a microwave oven including a microprocessor as its controller is provided, wherein two power relay driving transistors are to be turned on or turned off by a thyristor, which is triggered by a switching transistor, and a stabilizing circuit respectively. Two signals of different levels from terminals of the microprocessor are supplied to the base of the switching transistor and the stabilizing circuit in order to make the oven start heating operation. If the microprocessor operates in all possible abnormal states, both signals from the terminals of the microprocessor are to become the same level, all HIGH or all LOW, making either of the power relay driving transistors turned off, resulting in preventing power supply from being applied to the power relay.

REFERENCES:
patent: 4356370 (1982-10-01), Horinouchi
patent: 4394557 (1983-07-01), Tachihara et al.
patent: 4467164 (1984-08-01), Nakata et al.
patent: 4633067 (1986-12-01), Payne et al.

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