Title :
Soft-commutated Cuk and SEPIC converters as power factor preregulators
Author :
Pomilio, J.A. ; Spiazzi, G.
Author_Institution :
Fac. of Electr. Eng., Univ. Estadual de Campinas, Sao Paulo, Brazil
Abstract :
Cuk and SEPIC converters operating in discontinuous current mode (DCM), used as power factor preregulators (PFP), present some advantages over other topologies: sinusoidal current shaping using constant frequency and duty-cycle, low input current harmonic content, low input filter requirements, isolation between line and load, etc. The main drawbacks are the voltage and current stresses that devices are submitted to. In this paper, an auxiliary circuit is proposed which limits the overvoltage on the main switch and allows its zero-voltage turn off. Zero-current turn on is provided by the DCM operation. In this way switch commutations are soft, thus improving efficiency and reducing RF noise. Design criteria and experimental results are reported
Keywords :
DC-DC power convertors; commutation; power factor correction; power system harmonics; switching circuits; Cuk converters; RF noise reduction; SEPIC converters; auxiliary circuit; constant duty-cycle; constant frequency; current stresses; discontinuous current mode; efficiency improvement; low input current harmonic content; low input filter requirements; overvoltage limiting; power factor preregulators; sinusoidal current shaping; soft-commutated converters; switch commutations; voltage stresses; zero-current turn on; zero-voltage turn off; Circuit topology; Frequency conversion; Power harmonic filters; Power system harmonics; Radio frequency; Reactive power; Stress; Switches; Switching circuits; Voltage control;
Conference_Titel :
Industrial Electronics, Control and Instrumentation, 1994. IECON '94., 20th International Conference on
Conference_Location :
Bologna
Print_ISBN :
0-7803-1328-3
DOI :
10.1109/IECON.1994.397801
