HIGH FREQUENCY POWER SUPPLY AND ULTRASONIC WAVE GENERATOR

摘要

PROBLEM TO BE SOLVED: To provide a high frequency power supply which has high efficiency and which has variable frequency and output voltage. SOLUTION: In a tumor treatment equipment 1, an applicator 3 is brought into contact with a patient P and ultrasonic waves generated by a group 21 of piezoelectric elements driven by a high frequency power supply 9 are converged at the affected part R to heat the affected part R and cure a tumor. In the high frequency power supply 9, AC is converted to DC by means of an AC-DC converter and then the DC is switched to a rectangular wave by a switching circuit 33 and the rectangular wave is output to a filter 35. The filter 35 passes the fundamental waves through out of the rectangular wave components and the impedance matching is conducted by a load matching circuit 37 and then high frequency waves are supplied to the group 21 of piezoelectric elements.