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:
Jun. 12, 2012
Filed:
Aug. 04, 2011
Xiaoyan Wang, Milpitas, CA (US);
Liang Yan, Milpitas, CA (US);
Junjie Zheng, Santa Clara, CA (US);
John William Kesterson, San Jose, CA (US);
Clarita Poon, Pleasanton, CA (US);
Xiaoyan Wang, Milpitas, CA (US);
Liang Yan, Milpitas, CA (US);
Junjie Zheng, Santa Clara, CA (US);
John William Kesterson, San Jose, CA (US);
Clarita Poon, Pleasanton, CA (US);
iWatt Inc., Campbell, CA (US);
Abstract
In a switching power converter, PWM mode and PFM mode are separated into two independent control sections with the control voltage range in each control section determined independently. Each of the PWM and PFM modulation modes cannot operate continuously beyond its boundaries, thereby forming a control gap between the two control sections within which no continuous operation is allowed. In order to supply a load condition within the control gap, the power supply operates at the two boundaries of the control gap. Transition between PWM and PFM modes occurs fast, with low output voltage ripple. No limitation needs to be imposed on the control voltage range in each of the PWM and PFM control sections, because the control parameters in the PWM and PFM control sections need not be matched to one another, due to separation of the PWM and PFM modes by the control gap.