PROBLEM TO BE SOLVED: To efficiently generate a sine wave AC of approximately 60-200 Hz to be input to a step-up transformer of an AC potential therapy device without using a bridge circuit.SOLUTION: Using a width modulated high frequency pulse obtained by performing pulse width modulation by a sine wave voltage, switching control of a single switching element connected to a positive voltage power source sufficiently higher than the sine wave voltage is performed, and thus a width modulated amplification pulse output approximately at the level of the positive voltage can be obtained from the pulse output terminal. From a demodulated sine wave flow in which the pulse output is demodulated while removing a reverse negative pulse in a demodulation circuit comprising a chalk coil, diode, and capacitor, a sine wave AC obtained by performing DC cut by the capacitor is supplied to a primary coil of a step-up transformer, and thus a high voltage sine wave AC generated at a transformer secondary coil becomes a living body application AC of which a wave hight value ratio between positive voltage and negative voltage is 1:3 by a positive voltage bleeder circuit.COPYRIGHT: (C)2015,JPO&INPIT【課題】 交流電位治療器の昇圧トランスに入力する60Hz~200Hz程度の正弦波交流をブリッジ回路を用いずに効率よく発生させること。【解決手段】 正弦波電圧でパルス幅変調した幅変調済高周波パルスにより、前記電圧よりも充分高い正電圧電源に接続した単一のスイッチング素子をスイッチング制御することで、そのパルス出力端から前記正電圧程度の幅変調済増幅パルス出力を取り出し、このパルス出力をチョークコイルとダイオードとコンデンサとを有する復調回路で、逆向き負パルスを除去しつつ復調した復調済正弦波脈流から、コンデンサにより直流カットして得た正弦波交流を昇圧トランスの1次コイルに供給することで、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た。【選択図】図1
