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:
May. 11, 2010
Filed:
Apr. 02, 2007
Russell Jacques, Withersfield, GB;
Paul Ryan, Cambridgeshire, GB;
Catriona Mckay, Hertfordshire, GB;
Vinod A. Lalithambika, Cambridge, GB;
David M. Garner, London, GB;
Devarahandi Indika Mahesh DE Silva, Cambridgeshire, GB;
Russell Jacques, Withersfield, GB;
Paul Ryan, Cambridgeshire, GB;
Catriona McKay, Hertfordshire, GB;
Vinod A. Lalithambika, Cambridge, GB;
David M. Garner, London, GB;
Devarahandi Indika Mahesh de Silva, Cambridgeshire, GB;
Abstract
This invention relates to control techniques and controllers for resonant discontinuous forward power converters (RDFCs). A method of controlling a resonant discontinuous forward converter (RDFC), said converter including a transformer with primary and secondary matched polarity windings and a switch to, in operation, cyclically switch DC power to said primary winding of said transformer, said converter further having a DC output coupled to said secondary winding of said converter, said method comprising: sensing a transformer signal, said transformer signal representing a voltage across a winding of said transformer or a resonant current in a winding of said transformer; calculating a resonance period of said RDFC from said sensed transformer signal; and controlling an off duration of said switch in response to said calculated resonance period such that a sub-harmonic oscillation in said resonant voltage across said primary winding is reduced.