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:
Apr. 23, 2013
Filed:
Jul. 28, 2011
Balu Balakrishnan, Saratoga, CA (US);
Alex B. Djenguerian, Saratoga, CA (US);
Kent Wong, Fremont, CA (US);
David Michael Hugh Matthews, Windsor, GB;
Balu Balakrishnan, Saratoga, CA (US);
Alex B. Djenguerian, Saratoga, CA (US);
Kent Wong, Fremont, CA (US);
David Michael Hugh Matthews, Windsor, GB;
Power Integrations, Inc., San Jose, CA (US);
Abstract
A method and apparatus of reducing peak current variation with changing input line voltage in a switch mode power supply is disclosed. An example method includes sensing a current through a switching device of the switch mode power supply. A variable current limit threshold is generated, which increases from a first level to a second level during an on time of the switching device. The current is compared to the variable current limit threshold. A feedback signal representative of an output voltage of the switch mode power supply is sensed. The switching device is controlled in response to the feedback signal and said comparing the current to the variable current limit threshold.