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:
Feb. 28, 2012
Filed:
Mar. 06, 2008
Wessel Adolf Otten, Drachten, NL;
Wilhelmus Ettes, Drachten, NL;
Wessel Adolf Otten, Drachten, NL;
Wilhelmus Ettes, Drachten, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A motor control circuit (MC) comprising input terminals (IT, IT) to receive a rectified input voltage (Vrm), and output terminals (OT, OT) to supply a motor drive signal (Vm). A switching circuit () is alternately in an on-state (Ton) and an off-state (Toff) for intermittently coupling the input terminals (IT, IT) to the output terminals (OT, OT). A controller () controls the switching circuit () to be (i) in the on-state (Ton) during a first period in time (T) when an amount of magnetic saturation of the motor is smaller than a predetermined value, and (ii) alternately in the on-state (Ton) and the off-state (Toff) to obtain a pulse width control of the motor drive signal (Vm) during a second period in time (T) when the amount of magnetic saturation of the motor is larger than the predetermined value.