Power relay switching control device for microwave oven

Details Power relay switching control device for microwave oven Power relay switching control device for microwave oven

1987-05-29

1989-05-23

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1055R, 307127, 323908, 361185, 361208, H05B 668

Patent

active

048332844

ABSTRACT:
A power relay for a switching control device of a microwave oven, designed to prolong the life of the power relay by alternately carrying out the drive of the power relay used for controlling the power in a microwave oven at the positive (+) cycle and the negative (-) cycle of the alternating current input voltage, respectively. The output signal of the 50 Hz/60 Hz clock generator for generating the clock signal corresponds to the frequency of the alternating current input voltage and is combined with the output signal of the power relay ON/OFF generator. The power relay ON/OFF control part is composed so as to alternately realize the ON-point and the OFF-point of power relay at the positive cycle and the negative cycle of the alternating current input voltage, respectively, so that no potential difference takespace in one direction between contact of the power relay, and the life is thereby prolonged.

REFERENCES:
patent: 3018414 (1962-01-01), Albright
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patent: 3601688 (1971-08-01), Dogadko
patent: 3646439 (1972-02-01), Broski
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patent: 4153922 (1979-05-01), Azuma et al.
patent: 4296449 (1981-10-01), Eichelberger
patent: 4300032 (1981-11-01), Niu et al.
patent: 4339656 (1982-07-01), Yamakido
patent: 4405904 (1983-09-01), Oida et al.
patent: 4543493 (1985-09-01), Stanley et al.

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