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. 07, 2012
Filed:
Jun. 07, 2007
Josephus Adrianus Maria Van Erp, Eindhoven, NL;
Eric P. M. Verschooten, Duffel, BE;
Josephus Adrianus Maria Van Erp, Eindhoven, NL;
Eric P. M. Verschooten, Duffel, BE;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A drive circuit () for driving a load () comprises: a switched mode power supply () for supplying at the output () a switched output current (IL); a controller () for controlling the power supply; a current sensor () for generating a current sense signal (Vi) representing the output current (IL); a voltage sensor () for generating a voltage sense signal (Sy) representing the output voltage (Vp; Vp+Vis) of the circuit. The controller receives the current sense signal, and generates a switching time control signal (Sc) for the switched mode power supply () on the basis of the current sense signal. The controller further receives the voltage sense signal. In response to a change in the voltage sense signal, the controller changes the switching time control signal such as to effectively compensate an effect of the output voltage change on the average value of the output current.