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:
May. 24, 2016
Filed:
Dec. 28, 2012
Yoshio Nagatsuka, Tokyo, JP;
Yoshio Nagatsuka, Tokyo, JP;
MITSUBISHI ELECTRIC CORPORATION, Chiyoda-Ku, Tokyo, JP;
Abstract
A transformer steps down an input AC power, and supplies the AC power to a converter. The primary voltage of the transformer detected by a voltage detector is supplied to a converter controller and a frequency detector via a BPF. The converter controller controls the converter such that a power factor is equal to or greater than a predetermined value based on the primary voltage, and the converter converts the AC power into DC power. The frequency detector detects the frequency of the primary voltage based on an interval between time points at which the primary voltage via the BPF exceeds a threshold. A filter adjuster calculates a filter characteristic with the detected frequency as a center frequency of the BPF, and adjusts the BPF based on the filter characteristic.