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. 16, 2019
Filed:
Feb. 12, 2010
Antony P. Van DE Ven, Sai Kung, HK;
Gerald H. Negley, Chapel Hill, NC (US);
Michael James Harris, Cary, NC (US);
Paul Kenneth Pickard, Morrisville, NC (US);
Joseph Paul Chobot, Morrisville, NC (US);
Terry Given, Papakura, NZ;
Antony P. van de Ven, Sai Kung, HK;
Gerald H. Negley, Chapel Hill, NC (US);
Michael James Harris, Cary, NC (US);
Paul Kenneth Pickard, Morrisville, NC (US);
Joseph Paul Chobot, Morrisville, NC (US);
Terry Given, Papakura, NZ;
Cree, Inc., Durham, NC (US);
Abstract
A lighting apparatus includes a string of serially-connected light emitting devices and a bypass circuit coupled to first and second nodes of the string and configured to variably conduct a bypass current around at least one of the light-emitting devices responsive to a temperature and/or a total current in the string. In some embodiments, the bypass circuit includes a variable resistance circuit coupled to the first and second nodes of the string and configured to variably conduct the bypass current around the at least one of the light-emitting devices responsive to a control voltage applied to a control node and a compensation circuit coupled to the control node and configured to vary the control voltage responsive to a temperature and/or total string current.