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. 01, 2020
Filed:
Apr. 30, 2019
Vacon Oy, Vaasa, FI;
Andreas Doktar, Korsholm, FI;
VACON OY, Vaasa, FI;
Abstract
The present invention relates to a method for reducing common mode current in power electronic equipment comprising two or more active front end (AFE) components () coupled in parallel between an AC supply grid () and a DC-link (). A duty cycle of pulse width modulation (PWM) for the AFE components () is determined, and an error signal is derived based on the determined duty cycle of PWM and on a common mode current of the AFE components (). A correction voltage is derived, based on the error signal, and a DC voltage control signal is derived based on the derived correction voltage and a measured DC voltage of the DC-link () and/or a DC voltage reference. The power electronic equipment is controlled in accordance with the derived DC voltage control signal. The present invention also relates to a method for starting active front end (AFE) components () of power electronic equipment comprising two or more AFE components () coupled in parallel between an AC supply grid () and a DC-link ().