Flyback Versus Forward Switching Power Supply Topologies For Unipolar Pulsed-Power Applications

We discuss and compare modified flyback and forward switching power converter topologies in applications needing repetitive high-voltage (HV) low duty-cycle rectangular unipolar pulses. The output filters of these two converter topologies are removed, and the needed low duty-cycle operation is used...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2009-01, Vol.37 (1), p.171-178
Main Authors: Redondo, L.M., Silva, J.F.
Format: Article
Language:English
Subjects:
Applied sciences
Circuit topology
Circuits
Clamps
Connection and protection apparatus
Converters
Convertors
Electric potential
Electrical engineering. Electrical power engineering
Electrical equipment
Electrical machines
Electronic switching systems
Exact sciences and technology
Filters
Flux
high-voltage (HV) techniques
Network topologies
Plasma etching
Power electronics, power supplies
Power semiconductor switches
Pulse generation
Pulse transformers
Pulsed power supplies
pulsed-power systems
semiconductor switches
Semiconductors
Stress
Switches
Switching
Switching circuits
Switching converters
Topology
Transformers and inductors
Voltage
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Summary:We discuss and compare modified flyback and forward switching power converter topologies in applications needing repetitive high-voltage (HV) low duty-cycle rectangular unipolar pulses. The output filters of these two converter topologies are removed, and the needed low duty-cycle operation is used advantageously to generate several kilovolts of pulses using only low-voltage seriesless semiconductors. The two circuits proposed are based on step-up transformers with a constant flux reset clamp that uses the low duty cycle required to reduce the voltage stress on all semiconductor switches. Prototypes were assembled using < 1-kV semiconductor switches to obtain -5-kV output pulses with 5-mus pulsewidth and 10-kHz pulse frequency. Experimental results are presented and discussed. The forward topology was found to be a better choice to deliver HV low duty-cycle unipolar rectangular pulses, and it was tested in a plasma load.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2008.2006056