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:
Jul. 19, 1983
Filed:
Jun. 12, 1981
Applicant:
Inventor:
Toshiaki Ishii, Inazawa, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H02M / ;
U.S. Cl.
CPC ...
363 44 ; 3183 / ; 363129 ;
Abstract
An ac to dc power conversion apparatus employing commutated thyristors has a series circuit comprising a capacitor 8 and an impedance element 9 connected at the input side of a thyristor conversion unit 4. The capacitor reduces notch voltages generated during the commutation of the thyristors, and the impedance element prevents the capacitor from resonating with other inductive reactances in the circuit. A switching device 10 is connected in parallel with the impedance element, and is closed during the commutation of the thyristors to maximize the notch voltage reduction.