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. 04, 2010
Filed:
Dec. 12, 2008
Yat to William Wong, Hong Kong, HK;
Xiao Fei Kuang, Shenzhen, CN;
Kam Chuen Wan, Hong Kong, HK;
Kwok Kuen David Kwong, Davis, CA (US);
Yat To William Wong, Hong Kong, HK;
Xiao Fei Kuang, Shenzhen, CN;
Kam Chuen Wan, Hong Kong, HK;
Kwok Kuen David Kwong, Davis, CA (US);
Abstract
A power converter has a power transistor driving a power current through an inductor to provide a controlled power-supply voltage. The power transistor is on during a first state but off during a second state when a sink transistor reduces the power current through the inductor. Both voltage sensing of the power-supply voltage and current sensing at the power transistor provide feedback to control the amount of time that the first state is active, and thus control the power current. Current sensing is provided by a smaller minor transistor in parallel with the power transistor. The minor transistor turns on after the power transistor to reduce disturbance spikes. Switches connect sources of the power and mirror transistors to an amplifier that drives a sensing transistor. The sensing transistor generates a sensing voltage from the mirror transistor source. During the second state the amplifier's inputs are equalized to provide fast response.