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:
Aug. 10, 2010
Filed:
Mar. 04, 2008
Yoshihito Kawakami, Kanagawa, JP;
Junji Ishiyama, Kanagawa, JP;
Yoshihito Kawakami, Kanagawa, JP;
Junji Ishiyama, Kanagawa, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A power supply apparatus having a soft start function that enables a startup without any overshoot within an appropriate startup time regardless of whether the load is heavy or light. Even when output direct current voltage Vo has not yet risen upon startup, switch circuit () is turned ON within a count time of timer (), and clamping circuit () clamps error signal (Ve) of error amplifier (), so that an excessive signal is prevented from entering PWM circuit (), and electric power supplied to load () is controlled. Consequently, supply power as the power supply apparatus is limited, and any inrush current can be prevented from being generated. By controlling the count time of timer () when this error signal is clamped, it is possible to realize a startup within an appropriate startup time without any overshoot.