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. 06, 2017
Filed:
Mar. 31, 2016
Universal Lighting Technologies, Inc., Madison, AL (US);
Wei Xiong, Madison, AL (US);
Candice Ungacta, Huntsville, AL (US);
UNIVERSAL LIGHTING TECHNOLOGIES, INC., Madison, AL (US);
Abstract
An LED driver is provided with input surge absorbing capacity. A surge protection circuit branch is coupled across output lines from a DC power source, in parallel with and between a filtering capacitor and a non-isolated buck-boost PFC circuit. A variable impedance device such as a spark gap is coupled to a first power line and having a breakdown voltage to operate as an open circuit during normal operating conditions with respect to a peak input voltage across the capacitor. Responsive to a surge condition with respect to excess energy across the capacitor, the spark gap operates as a closed circuit, and a second capacitor coupled between the spark gap and the second line absorbs the excess energy. Responsive to a return to normal operating conditions, the spark gap reverts to an open state and the accumulated surge energy is discharged from the second capacitor to circuit ground.