PROBLEM TO BE SOLVED: To provide a power source device capable of supplying electric power more stably to the individual portions of an internal instrument introduced into the body.SOLUTION: A power source device comprises: a power receiving coil 10 for inducing an AC current in an AC magnetic field a first DC power source 20 for generating and outputting a DC voltage on the basis of the AC current induced in the power receiving coil 10 a second DC power source 30 for outputting a DC voltage and an electric power supply switching circuit 31 for supplying electric power to the individual portions of an internal instrument on the basis of the output DC voltage of the first DC power source in the state where the output DC voltage of the first DC power source is higher than the output DC voltage of the second DC power source, and for supplying the electric power to the individual portions of the internal instrument on the basis of the output DC voltage of the second DC power source in the state where the output DC voltage of the first DC power source is lower than the output DC voltage of the second DC power source.COPYRIGHT: (C)2014,JPO&INPIT【課題】体内に導入された体内機器の各部に対してより安定的に電力供給を行うことができる電源装置を提供することである。【解決手段】交流磁界中において交流電流を誘起する受電用コイル10と、受電用コイル10にて誘起される交流電流に基づいて直流電圧を生成して出力する第1直流電源20と、直流電圧を出力する第2直流電源30と、前記第1直流電源の出力直流電圧が前記第2直流電源の出力直流電圧より高い状態において前記第1直流電源の出力直流電圧に基づいて前記体内機器の各部に電力供給を行い、前記第1直流電源の出力直流電圧が前記第2直流電源の出力直流電圧より低い状態において前記第2直流電源の出力直流電圧に基づいて前記体内機器の各部に電力供給を行う給電切替回路(31)とを有する構成となる。【選択図】図3
