Research On A Single-Stage Active Power-Factor-Correction Electronic Ballast Control Circuit

in commonly, electronic ballasts use a double ac-dc-ac power conversion, traditional low-cost solution for the AC-DC conversion using a full-wave rectifier and a filter capacitor cannot be used due to restrictions on the harmonic content in the input current imposed by regulations , such as IEC 1000-3-2. Now, widely used electronic ballast comprise an ac-dc power-factor-correction stage followed by an inverter. Each of these stages requires an individual control circuit. Currently, there is a wide range of commercially available control integrated circuits that simplify the design of this kind of solutions. However, these two-stage-based electronic ballasts present a high number of components and a relatively high cost. Based on the integration of a half-bridge resonant inverter and a Buck-Boost active power-factor-correction converter, a single-stage electronic ballast's total number of components has been reduced to a minimum, using a single-stage complex power topology, high performance-to-price ratio, so it was wide regarded and abroad research.Since this single-stage complex power topology, therefore the electrical stresses on the shared switch should withstand the same maximum voltage that had the buck-boost input stage of the original converter, and the sum of the currents through the switches of both input and output stages. For this reason, a high quality control circuit is imperative.In this paper, based on the operation characteristics and the model of an active power-factor-correction single-stage electronic ballast for fluorescent lamps, a highly performance electronic ballast control circuit is designed. The contents of my dissertation are the followings.(1) Firstly, discussion of the feature, performance index and operate principle of normal fluorescent lamp, induction a single-stage electronic ballast based on the integration of a half-bridge resonant inverter and a Buck-Boost active power-factor-correction converter, analysis the issue of control circuit.(2) By analyses the qualify of control circuit and integrated based on the integration of a half-bridge resonant inverter and a Buck-Boost active power-factor-correction converter, we presented a new control circuit, which rose andfell faster and could falling to zero. Through method analysis on the control circuit, theoutput power sensitivity to the input voltage has reduced.(3) Computer Simulation Analysis and experimental results indicated that asingle-stage electronic ballast Integrated with this control circuit, the MOS switchcould performance longer and it's turn on and turn off times and switching losses couldreduced.The research of this paper presented an valuable reference to the practicality of the single-stage electronic ballast.