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:
Nov. 03, 2015
Filed:
Jul. 30, 2010
Shun Kazama, Osaka, JP;
Masaki Tagome, Osaka, JP;
Makoto Kitabatake, Nara, JP;
Abstract
To aim to reduce ripple current flowing through a capacitor in a power converter apparatus including a converter, the capacitor and an inverter. A current sensoris connected between a capacitorand an inverter circuitfor detecting current Iinv flowing from the capacitorto the inverter circuit. A frequency detecting subunitperforms fast Fourier transform on a waveform of the current Iinv to detect a frequency of a frequency component having the largest amplitude. Also, the frequency detecting subunitdetects a zero-cross point of the frequency component having the largest amplitude. Then a carrier signal control subunitperforms control such that a frequency and a rise time of a PWM carrier signal for driving the converter circuitmatch the frequency and the zero-cross point that have been detected by the frequency detecting subunitand the phase detecting subunit