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. 27, 2013
Filed:
Oct. 25, 2010
Ryotaro Kudo, Kanagawa, JP;
Ryotaro Kudo, Kanagawa, JP;
Renesas Electronics Corporation, Kanagawa, JP;
Abstract
A power source device capable of improving the power conversion efficiency at a light load independent of an input power source voltage is realized. For example, a clock signal is output from a common control unit to a PWM-mounted drive unit including a reverse-current detection circuit in addition to a peak current control method. This clock signal is selected by a mode setting signal from either of a clock signal with a constant frequency or a clock signal which is generated via a one-shot pulse generation circuit every time an output voltage at an output power source node decreases. When the latter is selected, the switching frequency at a light load decreases and the power conversion efficiency improves. Furthermore, the peak current control method can reduce the input power source voltage dependence of the switching frequency.