Electrical power supply

摘要

A power supply for energizing a load device such as an electrical motor of a small suction/compressor pump with DC, includes an AC socket for connection to an AC supply (2), a rectifier (8), a charging circuit (16) for charging a storage battery, a manual switch (SW1) for connecting the load device (1) either to the rectified AC from the AC source or to the battery, and a control circuit for connecting the battery to the load device (1) when the manual switch (SW1) is closed and the AC is not connected to an AC source, and for disconnecting the battery from the load device (1) and connecting it to the charging circuit (16) when the AC socket is connected to an AC source and the manual switch (SW1) is open.