Title :
A unity power factor low EMI battery charger for telecommunication applications
Author :
van der Berg, M. ; Ferreira, J.A. ; Hofsajer, I.W.
Author_Institution :
Energy Lab., Rand Afrikaans Univ., Johannesburg, South Africa
Abstract :
Low conducted EMI and unity power factor are important criteria for battery chargers in telecommunication applications. The conventional hard switching boost pre-regulator which is added to improve the power factor of DC power supplies used as battery chargers, often aggregates the conducted EMI emissions of power supplies. A large number of unity power factor topologies have been investigated, as well as a number of resonant power converters. However the interaction between unity power factor conversion and conducted EMI has received little attention. In this paper, unity power factor conversion and sources of EMI are investigated. A low EMI, all soft switching unity power factor power converter is introduced
Keywords :
AC-DC power convertors; battery chargers; bipolar transistor switches; electromagnetic interference; insulated gate bipolar transistors; power bipolar transistors; power factor correction; power semiconductor switches; rectifying circuits; resonant power convertors; switching circuits; telecommunication power supplies; battery charger; circuit topologies; conducted EMI; resonant power converters; soft switching; telecommunication applications; unity power factor; Batteries; Electromagnetic interference; Frequency; Parasitic capacitance; Reactive power; Switching converters; Telecommunications; Topology; Transformers; Voltage;
Conference_Titel :
Telecommunications Energy Conference, 1995. INTELEC '95., 17th International
Conference_Location :
The Hague
Print_ISBN :
0-7803-2750-0
DOI :
10.1109/INTLEC.1995.498996
