Title :
A new active waveshaping technique to comply with IEC 1000-3-2
Author :
Hernando, M. ; Sebastián, J. ; Villegas, P. ; Fernández, A.
Author_Institution :
DIEECS, Oviedo Univ., Spain
fDate :
31 Aug-4 Sep 1998
Abstract :
A new input current shaper has been recently proposed. Its operating principle is based on the connection of a voltage source and a loss-free resistor (LFR) between the input rectifier and the bulk capacitor in a conventional switching-mode power supply with no power factor correction. Both the voltage source and the LFR are obtained as an additional output from the power converter´s transformer. This additional output is a forward-type one with one extra inductor. The main difference with other input current waveshapers lies in the fact that the filter inductor of the additional output operates in continuous conduction mode, so the current stress in the power transistor is minimized. With the final topology, a good trade-off between capacitor voltage, re-cycling energy and harmonic content can be established in order to comply with IEC 1000-3-2
Keywords :
AC-DC power convertors; IEC standards; harmonic distortion; power conversion harmonics; power harmonic filters; rectifying circuits; IEC 1000-3-2 compliance; SMPS; active waveshaping technique; bulk capacitor; capacitor voltage; continuous conduction mode; filter inductor; harmonic content; harmonics standards; input rectifier; loss-free resistor; offline AC/DC power convertors; operating principle; power converter´s transformer; power transistor current stress; re-cycling energy; switching-mode power supply; voltage source; Capacitors; IEC standards; Inductors; Power factor correction; Power harmonic filters; Power supplies; Power transistors; Rectifiers; Resistors; Stress;
Conference_Titel :
Industrial Electronics Society, 1998. IECON '98. Proceedings of the 24th Annual Conference of the IEEE
Conference_Location :
Aachen
Print_ISBN :
0-7803-4503-7
DOI :
10.1109/IECON.1998.724202
