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:
Oct. 22, 2013
Filed:
Mar. 12, 2008
Makoto Sato, Shimoakasaka, JP;
Mitsutaka Sato, Shimoakasaka, JP;
Makoto Sato, Shimoakasaka, JP;
Mitsutaka Sato, Shimoakasaka, JP;
Sanken Electric Co., Ltd., , JP;
Abstract
AC-DC converter is provided which comprises an auxiliary windingin a transformer, a voltage detectorfor detecting a voltage Vappearing on auxiliary windingof transformerby on-off operation of a main switching elementin a DC-DC converterto produce an output signal Vwhen voltage Von auxiliary windinghas a negative polarity, a waveform shaperfor generating chopping signals Vfrom output signal Vof voltage detector, and a PWM circuitfor comparing output voltage Vfrom waveform shaperand output voltage Vfrom a boosting chopperto supply drive signals Vto step-up switching elementin boosting chopperwhen output voltage Vfrom waveform shaperexceeds output voltage Vfrom boosting chopper. While controlling fluctuation in output voltage from boosting chopper with respect to fluctuation in AC input voltage, the converter can improve input power factor relative to AC voltage and also reduce consumption power during light load period.