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. 28, 2019
Filed:
Oct. 16, 2018
Inter-global, Inc., St. Louis, MO (US);
Inter-Global, Inc., St. Louis, MO (US);
Abstract
A circuit for driving an LED lighting device from an AC power source includes a rectifier and one or more strings of LEDs. Each string of LEDs includes multiple LEDs. A controller produces control signals that open and close a set of switches that corresponding with the LED groups. The controller uses a current mirror with a pair of reference branches situated between a reference voltage and ground and between the switches and ground. Each reference branch has a first-in-line resistor between the reference voltage and the current mirror which primarily set the reference current through the controller by having the highest impedances, and the control signals are produced by a set of resistors on one of the branches. Each branch also has a last-in-line resistor between the current mirror and ground with the lowest impedances. The selection of the highest impedances and lowest impedances reduces sensitivity to temperature variations.