Patent ID: 8947015
Filing Date: 2015-02-03
Classification: H05B

Abstract:
1. A ballast operable to provide power to a light source from an alternating current (AC) power source modified by a chopper dimmer, the ballast comprising: a rectifier operable to receive AC power from the AC power source and provide rectified power; a DC to DC converter comprising a boost inductor having a primary winding and a detection winding, wherein the DC to DC converter is operable to receive the rectified power from the rectifier and provide a DC power rail; a dimming sensor operable to monitor a voltage of the detection winding of the boost inductor of the DC to DC converter and provide a dimming signal as a function of the monitored voltage; a light source driver circuit operable to receive the dimming signal from the dimming sensor, receive the DC power rail from the DC to DC converter, and provide power from the DC power rail to the light source as a function of the dimming signal, wherein an amount of power provided to the light source from the DC power rail by the light source driver circuit corresponds to a dimming level indicated by the dimming signal; the DC to DC converter further comprises a voltage regulator operable to provide a bias voltage; and the dimming sensor comprises