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. 23, 2017
Filed:
Nov. 10, 2015
Hangzhou Mps Semiconductor Technology Ltd., Hangzhou, CN;
Naixing Kuang, Hangzhou, CN;
Qiming Zhao, Hangzhou, CN;
Hangzhou MPS Semiconductor Technology Ltd., Hangzhou, CN;
Abstract
A primary control LED driver includes: a switching converter having a main switch and a first winding, and configured to provide an LED driving current; a second winding magnetically coupled to the first winding and configured to provide a power supply voltage at a first terminal; a first sensing resistor with a first terminal coupled to the main switch; a second sensing resistor with a first terminal coupled to the second terminals of the first sensing resistor and the second winding; an output current calculator calculating an equivalent value of the LED driving current based on the voltage at the first terminal of the first sensing resistor; an error amplifier configured to generate a compensation signal based on the equivalent value and a reference voltage; and a control circuit generating a control signal to control the main switch based on the compensation signal.