PROBLEM TO BE SOLVED: To provide a power circuit for an ultrasound image display device for achieving accurate symmetry between a positive voltage and a negative voltage.SOLUTION: The power circuit for an ultrasound image display device includes: a transformer 3 having a secondary winding comprising a first secondary winding 7 and a second secondary winding 8 connected in series a positive side output line 9 which is connected to an end on the side opposite to the second secondary winding 8 in the first secondary winding 7 and outputs a positive voltage +HV used for energy to transmit ultrasound a negative side output line 10 which is connected to an end on the side opposite to the first secondary winding 7 in the second secondary winding 8 and outputs a negative voltage -HV used for energy to transmit ultrasound and a feedback circuit 5 for feeding back a voltage expressed by +HV=-HV between the first secondary winding 7 and the second secondary winding 8 based on the voltage difference between the positive voltage +HV and the negative voltage -HV.COPYRIGHT: (C)2012,JPO&INPIT【課題】正の電圧と負の電圧の正確な対称性を実現することができる超音波画像表示装置用電源回路を提供する。【解決手段】二次側の巻線が、直列に接続された第一の二次側巻線7と第二の二次側巻線8とからなるトランス3と、前記第一の二次側巻線7における前記第二の二次側巻線8とは反対側の端部と接続され、超音波の送信エネルギーに用いられる正の電圧+HVを出力する正側出力ライン9と、前記第二の二次側巻線8における前記第一の二次側巻線7側とは反対側の端部と接続され、超音波の送信エネルギーに用いられる負の電圧-HVを出力する負側出力ライン10と、前記正の電圧+HV及び前記負の電圧-HVの電圧差に基づいて、|+HV|=|-HV|となる電圧を、前記第一の二次側巻線7と前記第二の二次側巻線8との間にフィードバックするフィードバック回路5と、を備える。【選択図】図2
