Patent ID: 8330085
Filing Date: 2012-12-11
Classification: H05B,Y02B

Abstract:
1. An RF heating system comprising: a variable-frequency oscillator; a semiconductor power amplifier for amplifying an output of the variable-frequency oscillator; a radiator for radiating an electromagnetic wave for heating based on an output of the semiconductor power amplifier; a reflected wave monitoring circuit for detecting a reflected wave of the electromagnetic wave for heating; and a controller for controlling an oscillation frequency of the variable-frequency oscillator, wherein during a process for heating an object with the electromagnetic wave for heating, the controller changes the oscillation frequency of the variable-frequency oscillator discontinuously between a number of frequencies including a frequency at which the intensity of the reflected wave becomes a local minimum and a frequency at which an intensity of the reflected wave does not become a local minimum, thereby conducting a frequency-hopping spread-spectrum radiation.