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. 29, 1995
Filed:
Aug. 17, 1994
Katsumi Ikeda, Kobe, JP;
Yushin Yamamoto, Kobe, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A device for controlling output voltage of a converter is provided. The input voltage V.sub.R is detected by means of a voltage detecting device and the phase .PHI. of the input voltage is detected by means of a phase synchronizing circuit. The detected phase is input to an AC sine wave reference oscillating circuit in order to obtain an AC sine wave reference signal having the same phase as input voltage. The output of an amplitude instruction generating circuit is multiplied by an AC sine wave reference signal by means of a multiplier in order to obtain a converter current instruction I.sub.A *. The input current I.sub.R detected by means of a current detecting device is differentiated by means of an approximation differentiator and only the resonance frequency component is detected by means of a band-pass filter. The detected resonance frequency component is multiplied by a gain K by means of a proportion device and the output os subtracted from the converter current instruction I.sub.A * by means of a subtractor. The current control amplifier and the PWM modulating circuit control a converter so as to make the output from the subtractor agree with the converter current I.sub.A * detected by a current detecting device.