Title :
Analysis of buck converters used as power factor preregulators
Author_Institution :
Dept. of Electron. & Inf., Padova Univ., Italy
Abstract :
Buck-type converters are analyzed for application as power factor preregulators. In particular, the maximum power for which the IEC 10003-2 standards are met is calculated for different conversion ratios and modulation techniques. Two step-down converters are proposed, which comply with EMC standards thanks to an auxiliary flyback stage which uses the same switches of the main converter plus a small power switch commutated at the line frequency. With proper design, the voltage stress of the main switch remains the same as for a conventional buck topology. Simulations and experimental results are reported to validate the theoretical analysis
Keywords :
commutation; power convertors; power factor correction; standards; switching circuits; EMC standards; IEC 10003-2 standards; auxiliary flyback stage; buck converters; buck topology; line frequency; main switch; maximum power; power factor preregulators; small commutated power switch; voltage stress; Buck converters; Electromagnetic compatibility; Frequency conversion; IEC standards; Reactive power; Stress; Switches; Switching converters; Topology; Voltage;
Conference_Titel :
Power Electronics Specialists Conference, 1997. PESC '97 Record., 28th Annual IEEE
Conference_Location :
St. Louis, MO
Print_ISBN :
0-7803-3840-5
DOI :
10.1109/PESC.1997.616778
