Patent ID: 8159151
Filing Date: 2012-04-17
Classification: H05B,Y10S

Abstract:
1. A control circuit for a driving inverter for a fluorescent lamp, comprising: a reference voltage source which generates a predetermined reference voltage; a pulse modulator which receives a feedback voltage that corresponds to a current flowing through the fluorescent lamp, and generates a pulse signal having a duty ratio adjusted such that the feedback voltage approaches the reference voltage; and a driver which drives a switching circuit according to the pulse signal so as to supply a switching voltage to a transformer provided in the form of a component external to the control circuit, wherein the reference voltage source comprises: a decoder circuit which receives a control signal from an external circuit, and controls the ON/OFF operations of the plurality of first switches according to the control signal, and wherein the control circuit outputs, as the reference voltage, a voltage that corresponds to a voltage drop that occurs at the converting resistor.