The present invention relates to an oxygen concentrator in which a pulsation detection device for detecting pulsation of oxygen supplied and a control device for controlling an amount of air supplied from a compressor based on the detection results in a pressure swing adsorption-type oxygen concentrator, which is equipped with an adsorption bed filled with an adsorbent capable of selectively adsorbing nitrogen relative to oxygen, the compressor for supplying air to the adsorption bed, a channel switching valve to repeat in a constant timing an adsorption step, in which air is supplied from the compressor to the adsorption bed to isolate concentrated oxygen and a desorption step, in which the adsorption bed is evacuated to regenerate the adsorbent and a flow rate measuring device for determining a supply flow rate of concentrated oxygen produced and an amount of oxygen produced is controlled by a feedback with a flow rate sensor by itself after paying attention to variation of a product flow rate caused by suppressing an amount of oxygen produced, thereby realizing an apparatus to satisfy secondary performance such as miniaturization, low power consumption and silencing.本發明之氧濃縮裝置係壓力變動吸附型氧濃縮裝置,且包含填充有較氧氣先選擇性地吸附氮氣之吸附劑之吸附床、將空氣供給至該吸附床之壓縮機、用以在一定時點反覆進行將來自該壓縮機之空氣供給至該吸附床且取出濃縮氧氣之吸附步驟與將該吸附床減壓且使吸附劑再生之脫附步驟之流路切換閥、及測定所產生之濃縮氧氣的供給流量之流量測定機構,其特徵在於:更具有檢測供給氧氣之脈動之脈動檢測機構,且具有根據該檢測結果來控制該壓縮機之空氣供給量之控制機構,並著眼於因抑制氧產生量而造成製品流量變動,且可實現單獨以流量感測器來進行產生量的反饋控制,藉此滿足小型、低耗電量、寧靜性等次要性能之裝置。1‧‧‧氧濃縮裝置3‧‧‧使用者(患者)101‧‧‧取入外部空氣過濾器102‧‧‧均壓閥103‧‧‧壓縮機104a、104b‧‧‧三向電磁閥105a、105b‧‧‧吸附筒106a、106b‧‧‧逆止閥107‧‧‧製品槽108‧‧‧調壓閥109‧‧‧流量設定機構110‧‧‧過濾器201‧‧‧加濕器301‧‧‧壓力感測器302‧‧‧流量感測器401‧‧‧控制機構
