PROBLEM TO BE SOLVED: To efficiently generate a sine wave AC of approximately 60-200 Hz inputted to a step-up transformer of an AC electric potential therapy device.SOLUTION: An AC electric potential therapy device alternately performs switching control of respective positive and negative DC voltages by two-system width modulated high frequency pulses, which are pulse width modulated by two-system different sine half wave signals whose phases are different from each other by 180°, to obtain two-system positive and negative width modulated amplified pulse outputs, thereafter, alternately demodulates the respective pulse outputs by a two-system demodulation circuit having two choke coils, two diodes and a capacitor while removing a reversed pulse to obtain two-system positive and negative demodulated sine half wave outputs whose phases are different from each other by 180°, and alternately supplies the positive and negative sine half wave outputs to a primary coil of a step-up transformer to make high voltage sine wave AC generated in a transformer secondary coil be biological application AC in which a wave height value ratio between a positive voltage and a negative voltage is one-to-three 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効率よく発生させること。【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、正負の各直流電圧を各別交互にスイッチング制御して正負2系統の幅変調済増幅パルス出力を得た後、これら各パルス出力をそれぞれ2個のチョークコイルと2個のダイオードとコンデンサとを有する2系統の復調回路で、逆向きパルスを除去しつつ各別交互に復調することで、位相が互いに180°異なる正負2系統の復調済正弦半波出力を得ると共に、これら正負の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た。【選択図】図1
