PROBLEM TO BE SOLVED: To efficiently obtain a high-voltage alternating current output for application to a living body by improving means for generating sinusoidal wave alternating current to be input to a step-up transformer.SOLUTION: Two lines of width-modulated high-frequency pulses, which have been pulse-width modulated by two lines of sinusoidal half-wave signals 180° out of phase with each other, are used to switching-control direct current voltages of about 130 volts by a switching circuit of full-bridge configuration to obtain width-modulated high-frequency pulse outputs. Each of the pulse outputs is then demodulated by means of a demodulation circuit including two choke coils, two capacitors, and two free-wheeling diodes to obtain two lines of demodulated sinusoidal half-wave outputs, in which the current direction alternately inverts for each 180° of phase. By alternately supplying each of the sinusoidal half-wave outputs to the primary coil of a step-up transformer, an alternating current for application to a living body, which has a peak value ratio of positive voltage to negative voltage of 1 to 3, is obtained from the high-voltage secondary coil via a positive voltage bleeder circuit.COPYRIGHT: (C)2015,JPO&INPIT【課題】 昇圧トランスに入力する正弦波交流の発生手段を改良することで、高圧の生体印加交流出力を効率よく得ること。【解決手段】 位相が互いに180°異なる2系統の正弦半波信号でパルス幅変調した2系統の幅変調済高周波パルスにより、130ボルト程度の直流電圧をフルブリッジ構成のスイッチング回路でスイッチング制御して幅変調済高周波パルス出力を得ると共に、これら各パルス出力を2個のチョークコイルと2個のコンデンサおよび2個のフリー・ホィーリング・ダイオードを用いた復調回路により復調することで、電流方向が180°位相毎に交互に反転する2系統の復調済正弦半波出力を得て、これら各正弦半波出力を昇圧トランスの1次コイルに交互に供給することで、高圧2次コイルから正電圧ブリーダ回路を介し、正電圧と負電圧との波高値比率が1対3の生体印加交流を得ることができた。【選択図】図1
