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:
May. 08, 2007
Filed:
Aug. 02, 2005
Jukka Ylppö, Helsinki, FI;
Kari Turunen, Vantaa, FI;
Jukka Ylppö, Helsinki, FI;
Kari Turunen, Vantaa, FI;
ABB Oy, Helsinki, FI;
Abstract
A method in a frequency converter provided with a voltage intermediate circuit in connection with interference in a network () to be supplied and a frequency converter (), which comprises a network converter part () and an inverter part () and a DC intermediate circuit () between them. The method comprises steps of controlling the intermediate circuit voltage at the beginning of network interference by limiting the torque on the inverter side, detecting interference in the network voltage, setting a torque reference to a predetermined value in response to the network interference, detecting network voltage recovery, and controlling the torque reference to a normal value in response to the network voltage recovery.