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A series-parallel load-resonant converter for a controlled-current arc-welding power supply
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Pollock, Helen Geraldine Phyllis (1996) A series-parallel load-resonant converter for a controlled-current arc-welding power supply. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b1352686~S15
Abstract
A power supply incorporating a series-parallel load-resonant converter, capable of very
efficient operation over a wide range of output power is presented. The series-parallel
load-resonant converter is shown to have three pairs of resonant frequencies.
Operation of the circuit at each of these resonant frequencies maintains zero current
switching and high frequency operation. Design mathematics is developed which
allow series-parallel load-resonant converters to be designed with specific resonant
frequencies and circuit resistances. A new method of power control for series-parallel
load-resonant converters is presented; the power delivered to the circuit and hence the
load is shown to var substantially depending on which resonant frequency the circuit
is excited at. Two series-parallel load-resonant converters are designed simulated,
constructed and tested. There is good agreement between the simulation and
experimental results. One of the circuits produces an output current of 200 A while
the second demonstrates the new power control technique pulsing between 55 A and
145 A while running at frequencies of 63 kHz and 100 kHz. The new power supply
is particularly suited to arc-welding. It contains an active rectifier and draws near
unity power factor.
| Item Type: | Thesis or Dissertation (PhD) | ||||
|---|---|---|---|---|---|
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||
| Library of Congress Subject Headings (LCSH): | Electric power -- Design and construction, Electric resonators, Electric welding -- Power supply | ||||
| Official Date: | March 1996 | ||||
| Dates: |
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| Institution: | University of Warwick | ||||
| Theses Department: | School of Engineering | ||||
| Thesis Type: | PhD | ||||
| Publication Status: | Unpublished | ||||
| Supervisor(s)/Advisor: | Flower, John | ||||
| Extent: | xviii, 208 leaves | ||||
| Language: | eng |
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