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:
Sep. 19, 2006
Filed:
Jul. 12, 2004
Ronan DE Larminat, Northbrook, IL (US);
Alexander Kurnia, Buffalo Grove, IL (US);
Guang Liu, Lake Zurich, IL (US);
Ronan de Larminat, Northbrook, IL (US);
Alexander Kurnia, Buffalo Grove, IL (US);
Guang Liu, Lake Zurich, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method and apparatus for measuring current by a single sensor for two motor phases driven by first and second set of switches to drive respective first and second phases of a motor under control of PWM signals. A first stepincludes reading a duty cycle of each winding drive current. A next step configuresthe PWM signals to provide at least one timing window wherein at least of one of the windings of the motor is being driven while the other winding is not being driven, and to provide a relative timing offset of approximately one-half cycle between the pulse width modulation signals driving a first winding and a second winding of the motor. A next stepincludes gating the switches with the configured PWM signals. A next stepincludes sampling the current of the at least one of the windings with a single sensor.