THERMAL THERAPY DEVICE

摘要

There is provided a thermal therapy device capable of surely following the change of resonance frequency even when the resonance frequency of the series resonance circuit of the secondary side greatly changes and generating a magnetic field of intensity required for heating an affected part. The thermal therapy device includes an inverter circuit (2) connected to the primary side of a transformer (1), a series resonance circuit (5) having a magnetic field generation coil (3) and a resonance controller (4) and connected to the secondary side, and a controller (20) for deciding the resonance frequency by using secondary current. The therapy operation mode may be a measurement mode or an operation mode which are repeated alternately. During the measurement mode, the resonance frequency of the series resonance circuit (5) is measured. During the operation mode, a drive signal of the measured resonance frequency is supplied from the controller (20) to the inverter circuit (2). As a result, even if the impedance of the series resonance circuit (5) or the like fluctuates during therapy, the frequency of the drive signal supplied to the inverter circuit can follow the resonance frequency.