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:
Apr. 19, 2005
Filed:
Nov. 28, 2002
Masaaki Shimada, Niiza, JP;
Tomoyasu Yamada, Niiza, JP;
Masaaki Shimada, Niiza, JP;
Tomoyasu Yamada, Niiza, JP;
Sanken Electric Co., Ltd., Niiza, JP;
Abstract
A switching power supply such that the step-up ratio of when the power-factor is improved does not increase, and the conversion efficiency can be improved. In a case where the error voltage Ver outputted from a conductance amplifier () increases over a reference voltage Vref, a switching signal of high level is outputted from a comparator () to a FET () to turn on the FET (). Therefore a resistor () is bypassed, and as a result a reference voltage Vrefinputted into the conductance amplifier () is changed from a reference voltage Vref-to Vref-of lower level. Further, since the variation of the error voltage Ver outputted from the conductance amplifier () decreases, the output voltage Vout also decreases.