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:
Feb. 17, 2004
Filed:
Aug. 12, 2002
Toshizumi Ando, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A power supply apparatus includes an interface microcomputer driven by the output voltage from a first voltage transducer circuit for boosting the output voltage of a DC power supply. The interface microcomputer outputs an activation signal for activating a control IC. When a switch receives the activation signal from the control IC, the switch becomes conducting and applies the output voltage from the first voltage transducer circuit to the control IC. A delay circuit delays the activation signal from the interface microcomputer for a predetermined period of time and supplies the delayed activation signal to the control IC, thus causing the control IC to start controlling the operation of a voltage output unit. A second voltage transducer circuit for boosting the output voltage of the DC power supply and outputting a voltage of 5 V includes a charge pump circuit at the output stage thereof.