Power relay control circuit for a microwave oven

Details Power relay control circuit for a microwave oven Power relay control circuit for a microwave oven

H - Electricity

05

B

327/2.5

H05B 6/68 (2006.01) H05B 6/66 (2006.01)

Patent

CA 1263451

ABSTRACT OF THE DISCLOSURE 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 transitors, 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 HIGHs or all LOWs making either of the power relay driving transistors turned off, resulting in preventing power supply from being applied to the power relay.

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