PROBLEM TO BE SOLVED: To provide an oxygen concentrator in which a battery power supply is switched with a commercial power supply without giving load variation caused when supplying power to electrical components.SOLUTION: An oxygen concentrator is configured such that a feed air is taken in and compressed in a compressor, and the compressed air is supplied in the adsorbent to absorb oxygen, and thereby the separated oxygen is sent off. The oxygen concentrator has a power supply circuit for selectively using a commercial power supply and a battery 204 when sending a drive current to the electrically driven components in the device, and a motor drive circuit for giving a drive current inputted from the power supply circuit to the compressor as the driving power becoming necessary for rotational motion of a compressor. The oxygen concentrator has a current variation monitoring unit 302 for monitoring a drive current of the compressor for switching between a commercial power supply and the battery as the power supply by the power supply circuit. A current monitoring unit is configured to switch the power supply so as to receive the electrical current from the commercial power supply in the timing when the drive current of the compressor drops to a predetermined level.SELECTED DRAWING: Figure 7COPYRIGHT: (C)2016,JPO&INPIT【課題】電源供給時に生じる負荷変動を精密な電気部品に与えることなく、バッテリ電源と商用電源を切換える酸素濃縮装置を提供する。【解決手段】原料空気を取り込んで、コンップレッサで圧縮し、圧縮空気を吸着剤に供給して酸素を吸着することにより、分離した前記酸素を送り出す酸素濃縮装置であって、装置内の電気駆動部品に駆動電流を送る上で、商用電源とバッテリ204とを選択的に利用する電源回路と、電源回路から駆動電流が入力されて、コンプレッサの回転動作に必要となる駆動電力としてコンプレッサに与えるためのモータ駆動回路と有しており、電源回路により、電源としての商用電源とバッテリとの切換えを行うためにコンプレッサの駆動電流をモニタする電流変動監視部302を有していて、電流監視部が、コンプレッサの駆動電流が所定レベルに下がったタイミングで、商用電源からの電流を受け取るように電源を切換える構成とした。【選択図】図7
