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. 18, 2017
Filed:
May. 30, 2012
Stephen D. Mays, Ii, Madison, AL (US);
John J Dernovsek, Madison, AL (US);
Philip Walker, Manchester, TN (US);
Donald Folker, Madison, AL (US);
Stephen D. Mays, II, Madison, AL (US);
John J Dernovsek, Madison, AL (US);
Philip Walker, Manchester, TN (US);
Donald Folker, Madison, AL (US);
UNIVERSAL LIGHTING TECHNOLOGIES, INC., Madison, AL (US);
Abstract
An isolated buck converter protects inverter switches during non-zero voltage switching and reduces output ripple current by maintaining operation of an output inductor of the isolated buck converter in a continuous current mode. Continuous current mode operation is maintained by various combinations of: shifting the frequency of operation of the inverter switches of the isolated buck converter as a function of output current of the isolated buck converter; employing pulse density modulation to decrease the off time of the isolated buck converter which will decrease the magnitude of the current ripple; and use a step gap core (i.e., a swinging choke) for the output inductor that saturates to a lower value of inductance for high load current and a higher value of inductance at low load current.