Cold start control system for microwave cooking appliance

Details Cold start control system for microwave cooking appliance Cold start control system for microwave cooking appliance

H - Electricity

05

B

H05B 6/66 (2006.01) F24C 7/02 (2006.01) F24C 7/08 (2006.01) H05B 6/68 (2006.01)

Patent

CA 2499166

A microwave cooking appliance includes a control system which, at initial start-up of a microwave energy generating magnetron, assures that the timing of power supply switching is precisely controlled. In accordance with a preferred embodiment of the invention, power to a primary winding of a half wave voltage-doubling magnetron power supply is switched on ninety degrees after a zero crossing of line voltage. In this manner, the power on timing coincides with the midpoint of a charging half-cycle of a power supply capacitor to obtain consistent and minimum open circuit voltage starts whenever the magnetron is activated from a cold start.

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