Microwave heating apparatus

Details Microwave heating apparatus Microwave heating apparatus

H - Electricity

05

B

H05B 6/68 (2006.01)

Patent

CA 2055362

A microwave heating apparatus is disclosed which comprises a microwave oscillator, a waveguide for transmitting a microwave outputted from the microwave oscillator to an abject to be heated, means for detecting power provided in the waveguide so as to detect the power of the microwave inputted from the microwave oscillator to the object to be heated and the reflected power of the microwave reflected from the object to be heated, a matching stub provided in the waveguide, and means for driving the matching stub. The driving means is provided with means for calculating a VSWR value from the inputted power and the reflected power, a motor for driving the matching stub, and means for controlling the operation of the motor so that the VSWR value is maintained within a predetermined range. By the microwave heating apparatus, matching of the waveguide impedance with the load impedance can be executed automatically and the VSWR value can be maintained in the range of good matching. Thus the lowering of heating efficiency can be prevented.

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