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:
Mar. 17, 2015
Filed:
Apr. 14, 2011
David Fricker, Oberhoffen sur Moder, FR;
David Fricker, Oberhoffen sur Moder, FR;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A method for determining a time for a zero crossing of a phase current in a polyphase electrical machine (). The method including driving a driver circuit () for providing phase voltages to operate the electrical machine (); deactivating a pulse-width-modulated driving by at least one power switch (), such that no potential is applied to connecting nodes (AI, A, B, B) by the driver circuit (), at least during a time segment in each cycle of the pulse width modulation; detecting a diode voltage via a freewheeling diode, with which the deactivated power switch () has been provided, within the time segment; and fixing the time for the zero crossing of the phase current as the time after which there is no longer a diode voltage present across the freewheeling diode () within the time segment.