Method for controlling a power relay for actuating a magnetron o

Details Method for controlling a power relay for actuating a magnetron o Method for controlling a power relay for actuating a magnetron o

1993-06-14

1994-10-18

Leung, Philip H.

Electric heating

Microwave heating

With control system

219716, 219719, 219723, H05B 668

Patent

active

053570871

ABSTRACT:
A method for controlling a power relay for actuating a magnetron of a microwave oven in which contacts thereof are closed at various points of time or phase of an AC sinusoidal waveform input thereto with an equal probability, thereby preventing a transfer of the contacts of the power relay. According to the present invention, a count number of a relay counter is incremented periodically upon application of power, until a start key signal is inputted. The count number of the relay counter is then incremented by 1 whenever the start key signal is inputted and the power relay is toggled from its off state to its on state. An interrupt number is incremented periodically as the count number of the relay counter whenever an internal or external interrupt routine is performed. When the count number of the relay counter and the interrupt number are the same, the contacts of the power relay are closed at a phase or a point of time corresponding to the same number, so as to actuate the magnetron. Therefore, the power relay is driven initially at a random phase upon application of power and at the next phase when the magnetron is to be turned on after it is temporarily turned off since the power level is not full or when the operation of the microwave oven is restarted due to the re-input of the start key signal after the operation is stopped with its door open in operation.

REFERENCES:
patent: 4378487 (1983-03-01), Maeda
patent: 4394557 (1983-07-01), Tachihara et al.
patent: 4467164 (1984-08-01), Nakata et al.
patent: 4987556 (1991-01-01), Aoki

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