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:
Aug. 18, 2009
Filed:
May. 31, 2005
Eiji Yamamoto, Fukuoka, JP;
Hidenori Hara, Fukuoka, JP;
Kouichi Eguchi, Fukuoka, JP;
Kabushiki Kaisha Yaskawa Denki, Fukuoka, JP;
Abstract
It is an object of the present invention to provide a PWM cycloconverter that can compensate an error between a voltage command and a real voltage generated by a commuting operation. The PWM cycloconverter for solving the above-described problem includes: an input voltage phase detector () for detecting the phase of the voltage of a three-phase ac power source (); a current direction detector () for detecting the direction of a current supplied to a two-way semiconductor switch (); and a commutation compensator () for receiving the outputs of the input voltage phase detector and the current detector as inputs to compensate for a voltage command.