PROBLEM TO BE SOLVED: To efficiently provide a biological application AC output of high voltage by improving generation means for sine wave AC which is inputted in a step-up transformer.SOLUTION: By using a width modulated high frequency pulse, along with its synchronous ON-signal, from sine half-wave signals about 60-200 Hz different from each other by 180° in phase, a switching circuit of full bridge configuration which is connected between a ground and a DC power source of about 135 bolts is switching-controlled, so as to provide width modulated amplifying pulse outputs in two systems different from each other by 180° in phase. Demodulated sine half-wave outputs of two systems with current direction inverting at each half wave which are obtained by demodulating the pulse outputs are supplied alternately to a primary coil of a step-up transformer, and a high voltage sine wave AC generated at a secondary coil of the transformer is taken as a biological application AC, with a wave height value ratio between positive voltage and negative voltage being 1:3 by 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60Hz~200Hz程度の正弦半波信号による幅変調済高周波パルスと、その同期オン信号とで、135ボルト程度の直流電源と接地間に接続した、フルブリッジ構成のスイッチング回路をスイッチング制御することで、位相が互いに180°異なる2系統の幅変調済増幅パルス出力を得ると共に、これら各パルス出力を復調した電流方向が半波毎に反転する2系統の復調済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、トランス2次コイルに発生した高圧正弦波交流を正電圧ブリーダ回路により、正電圧と負電圧との波高値比率が1対3の生体印加交流となし得た。【選択図】図1
