| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of controlling a high-frequency output depending on power source voltage plus cooling capacity, for a high-frequency heating device driving a magnetron such as a microwave oven. Ž<P>SOLUTION: A PWM signal of a microcomputer for controlling a high-frequency output can be changed based on information obtained from an input power source voltage detection circuit back to the original. However, a PWM value is made constant in the vicinity of the rating in consideration of variation of parts and read-in variation due to power source impedance. Further, the PWM value at the rating can be set at maximum with other points decreased (especially, at the maximum output), in consideration of the cooling capacity and absolute safety at parts destruction. Thus, an optimum high-frequency output can be set in accordance with cooling capacity for each power source voltage. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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