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, 2009
Filed:
Jul. 06, 2006
Philip John Moyse, Carlton, GB;
David Robert Coulson, Watford, GB;
Russell Jacques, Withersfield, GB;
David M. Garner, London, GB;
Philip John Moyse, Carlton, GB;
David Robert Coulson, Watford, GB;
Russell Jacques, Withersfield, GB;
David M. Garner, London, GB;
Cambridge Semiconductor Limited, Cambridge, Cambridgeshire, GB;
Abstract
We describe a switch mode power supply (SMPS) controller employing a combination of pulse frequency and pulse width modulation. The controller employs a 'gear box' control scheme using two complementary control loops, one for real-time control of the SMPS using PFM and a second using a PWM control scheme which monitors the switching frequency and, at defined operating points, adjusts the pulse width up or down through a set of pre-determined values. This can be considered analogous to the gearbox of a motor vehicle with the SMPS pulse width, switching frequency and output power roughly corresponding to the vehicle's gear ratio, engine speed and road speed respectively.