PROBLEM TO BE SOLVED: To efficiently generate sine wave AC of approximate 60-200 Hz to be inputted to a step-up transformer of an AC potential therapy device.SOLUTION: An AC potential therapy device independently and alternately performs switching control of respective positive and negative DC voltages by width modulated high frequency pulses of two systems obtained by pulse width modulation by sine half-wave signals of two systems in which phases are different from each other by 180° to obtain positive and negative width modulated amplification pulse outputs of two systems. Thereafter, the AC potential therapy device: independently and alternately demodulates the respective pulse outputs in a demodulation circuit having two choke coils, two diodes, and a single capacitor to obtain positive and negative demodulated sine half-wave outputs of two systems in which phases are different from each other by 180° and alternately supplies the positive and negative sign half-wave outputs to a primary coil of a step-up transformer to convert high voltage sine wave AC generated in a transformer secondary coil into living body application AC in which a wave crest value ratio of a positive voltage crest value to a negative voltage crest value 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個のダイオードと単一のコンデンサとを有する復調回路で各別交互に復調することで、位相が互いに180°異る正負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
