The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 02, 2000
Filed:
Apr. 30, 1998
Sony Corporation, Tokyo, JP;
Abstract
The AC electric power of the commercial AC power supply is safely supplied to an electronic appliance functioning as a load during an occurrence of a power interruption by an auxiliary power supply apparatus. In the auxiliary power supply apparatus, normally usable electric power derived from a diode bridge energized by the commercial AC power supply, and auxiliary electric power produced from a DC/DC converter energized by a cell are selectively conducted to an output connector of this auxiliary power supply apparatus via a selection switch and a load connection switch, which are controlled in response to a detection result of a power-interrupt detecting circuit. When an AC plug of a load set is inserted into this output connector, a switch is turned ON, and then, a DC voltage applied from a voltage divider to this connector is changed, depending upon the types of the power supply circuits employed in the load sets, namely, a transformer type power supply circuit and a switching type power supply circuit. This voltage change is detected by a voltage/gradient detecting circuit, so that the load connection switch is turned ON only for the switching type load set. A modem apparatus and the like may be continuously operated.