Patent ID: 8482222
Filing Date: 2013-07-09
Classification: H02M,H05B

Abstract:
1. A lighting device comprising: a DC-DC converter having first and second DC power input terminals coupled to a DC power source, a switching element, and first and second DC power output terminals; a DC current conducting element coupled across the DC power output terminals; a load terminal having first and second semiconductor light-emitting element connection terminals; a load detection circuit coupled on a first end to the second DC power input terminal and on a second end to the load terminal, the load detection circuit effective to detect a DC voltage across the first and second ends of the load detection circuit and to control a switching operation of the DC-DC converter based on the detected DC voltage; and a diode coupled between the load terminal and the DC current conducting element, the diode effective to block a DC current path from the DC power input terminals to the load detection circuit through the DC current conducting element.