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:
Sep. 16, 2014
Filed:
Sep. 26, 2011
Hiroyasu Iwabuki, Tokyo, JP;
Hiroshi Kurushima, Tokyo, JP;
Hiroyasu Iwabuki, Tokyo, JP;
Hiroshi Kurushima, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A three-phase rectification circuit rectifies output voltage of a three-phase AC power supply, a step-up converter circuit steps up the output voltage, and a smoothing device smoothes the stepped-up output voltage. A voltage detection circuit detects output voltage Voof the smoothing device, and an AC current component detection circuit extracts AC component included in output current of the three-phase rectification circuit and outputs a detection signal Vicorresponding to the AC component. A control circuit calculates a deviation ΔVdc(=Vs−Vo−Vi) among an output voltage instruction Vs for output voltage of the step-up converter circuit and detection signals Voand Viobtained by the detection circuits, and generates a pulse signal for suppressing the deviation ΔVdcto zero, thereby performing PWM control for a switching device of the step-up converter circuit.