Patent ID: 6762563
Filing Date: 2004-07-13
Classification: B61L,H05B,Y02B

Abstract:
A module for powering and monitoring a light-emitting diodes load by means of a power line, the module comprising:an input power switch circuit having an input connected to the power line for receiving power from the power line and monitoring a voltage magnitude thereof to enable and disable the module according to the voltage magnitude of the power line; a fuse blowout circuit having a fuse through which the input power switch circuit monitors the voltage magnitude of the power line, said fuse blowout circuit being adapted for blowing out said fuse to disable the input power switch circuit if no current flows through the light-emitting diodes load after a pre-determined time when the input power switch circuit is activated; a cold filament test circuit having an input connected to the power line for emulating an impedance of an incandescent light during a power stage set-up time during which no current is supplied to the light-emitting diodes load; a current detector circuit for detecting a current supplied to the light-emitting diodes load and for disabling the fuse blowout circuit and the cold filament test circuit when the current of the light-emitting diodes load reaches a predetermined current level; and a boost power stage circuit having an input connected to the power line and an output connected to the light-emitting diodes load for powering the light-emitting diodes load.