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:
Oct. 11, 1988
Filed:
Sep. 29, 1987
Georg Heinle, Erlangen, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A method for reducing the instantaneous voltage ripple of an electrical drive which is fed by a current intermediary circuit frequency converter with phase sequence quenching. During pulsed operation of asynchronous rotating machinery, driven by a current intermediary circuit frequency converter with phase sequence quenching, an interfering instantaneous voltage ripple occurs due to the inverter minimum time required for the completion of a complete commutation. The operating capacity of the inverter is not imparied, even if the switch-on time of individual thyristors falls below the minimum time. Depending on the degree of incomplete commutation occurring in the process, a difference is made beween one of a 'first kind' and one of the 'second kind' and, in the case of the second kind, the duration of the actual switch-on pulses for maintaining a linear relationship between the current time area and the nominal pulse duration is advantageously adapted through a correction function.