Solid state lighting apparatus with compensation bypass circuits and methods of operation thereof
US10264637B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 2010 |
| Grant date | Apr 16, 2019 |
| Priority date | — |
| Expiry date | Jan 12, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/56
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.