POWER SUPPLY CONTROLLER, POWER SUPPLY DEVICE, AND POWER SUPPLY CONTROL METHOD

To realize highly efficient charging/discharging of a secondary battery.SOLUTION: A controller 100 for controlling charging/discharging of a power supply device 1 comprising a main power supply part 2 and a sub power supply part 3 thar are connected in parallel to a load L comprises relevant information indicating the relationship of a discharge current from a power supply device 1 to the load L, a discharge current ratio that is a ratio between an output current of the main power supply part 2 and an output current of the sub power supply part 3, and a power supply loss of the power supply device 1. It is so adjusted that a measurement value of the discharge current from the power supply device 1 to the load L is acquired, the discharge current ratio whose power supply loss of the power supply device 1 corresponding to the acquired measurement value of the discharge current from the power supply device 1 to the load L becomes minimum is determined from the relevant information, and the discharge current ratio is made to become the discharge current ratio determined from the relevant information.SELECTED DRAWING: Figure 1 【課題】二次電池の高効率な充放電を実現する。【解決手段】負荷Ｌに並列に接続されるメイン電源部２及びサブ電源部３を備える電源装置１の充放電を制御する制御装置１００であって、電源装置１から負荷Ｌへの放電電流と、メイン電源部２の出力電流とサブ電源部３の出力電流との比率である放電電流比率と、電源装置１の電源損失との関係を示す関係情報を有し、電源装置１から負荷Ｌへの放電電流の測定値を取得し、取得した電源装置１から負荷Ｌへの放電電流の測定値に対応する電源装置１の電源損失が最小となる放電電流比率を関係情報から求め、放電電流比率を、関係情報から求めた放電電流比率となるように調整する。【選択図】図１