Patent Number: 9,431,852

Title: Power supply device

Abstract: A power supply device includes an input terminal to which an electric power is supplied from a commercial power source; an output terminal connected to an electric load; a power storage device to be charged by the electric power supplied from the input terminal and supplying the electric power to the output terminal; a primary battery; and a controller supplying an output of the primary battery to the output terminal, when monitoring a voltage of the commercial power source, which is applied to the input terminal, and a charged state of the power storage device, and detecting that the voltage of the commercial power source falls to a specified voltage value or less and the charged state of the power storage device indicates a specified value or less.

Inventors: Hirata; Kazuhiro (Yokosuka, JP)

Assignee: Sumitomo Heavy Industries, Ltd.

International Classification: H02J 7/00 (20060101); H02J 9/06 (20060101); H02J 9/00 (20060101); H02J 7/34 (20060101); G01R 31/36 (20060101); H01M 12/06 (20060101)

Expiration Date: 2020-08-30 0:00:00