A new soft-switching technique using a modified PWM scheme requiring no extra hardware

D. Tooth; N. McNeill; S.J. Finney; B.W. Williams

doi:10.1109/63.949501

A new soft-switching technique using a modified PWM scheme requiring no extra hardware

D. Tooth, N. McNeill, S.J. Finney, B.W. Williams

Electronic And Electrical Engineering

Research output: Contribution to journal › Article

11 Citations (Scopus)

Abstract

A new soft-switching PWM scheme for a three-phase, AC-DC, step-down unity power factor converter is described. The main advantage of the scheme is that it requires no additional hardware components to achieve a combination of zero current and voltage turn-off and zero and reduced voltage turn-on. The scheme relies on the repositioning of the PWM pulses within the carrier period to obtain natural commutation from one switching device to the next. The theoretical reduction in the total switching losses is mathematically shown to be 42% compared with the standard center-aligned PWM scheme used with the converter. A PSpiceTM simulation of the new scheme reveals soft-switching waveforms. Practical results are given to support the simulation results and heat-sink temperature rise results show a reduction in heat-sink temperature rise for the new scheme compared to the old

Original language	English
Pages (from-to)	686-693
Number of pages	7
Journal	IEEE Transactions on Power Electronics
Volume	16
Issue number	5
DOIs	https://doi.org/10.1109/63.949501
Publication status	Published - 2001

Keywords

AC-DC power convertors
PWM power convertors
SPICE commutation
switching circuits
power systems

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10.1109/63.949501

http://dx.doi.org/10.1109/63.949501

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title = "A new soft-switching technique using a modified PWM scheme requiring no extra hardware",

abstract = "A new soft-switching PWM scheme for a three-phase, AC-DC, step-down unity power factor converter is described. The main advantage of the scheme is that it requires no additional hardware components to achieve a combination of zero current and voltage turn-off and zero and reduced voltage turn-on. The scheme relies on the repositioning of the PWM pulses within the carrier period to obtain natural commutation from one switching device to the next. The theoretical reduction in the total switching losses is mathematically shown to be 42% compared with the standard center-aligned PWM scheme used with the converter. A PSpiceTM simulation of the new scheme reveals soft-switching waveforms. Practical results are given to support the simulation results and heat-sink temperature rise results show a reduction in heat-sink temperature rise for the new scheme compared to the old",

keywords = "AC-DC power convertors, PWM power convertors, SPICE commutation, switching circuits, power systems",

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journal = "IEEE Transactions on Power Electronics",

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T1 - A new soft-switching technique using a modified PWM scheme requiring no extra hardware

AU - Tooth, D.

AU - McNeill, N.

AU - Finney, S.J.

AU - Williams, B.W.

PY - 2001

Y1 - 2001

N2 - A new soft-switching PWM scheme for a three-phase, AC-DC, step-down unity power factor converter is described. The main advantage of the scheme is that it requires no additional hardware components to achieve a combination of zero current and voltage turn-off and zero and reduced voltage turn-on. The scheme relies on the repositioning of the PWM pulses within the carrier period to obtain natural commutation from one switching device to the next. The theoretical reduction in the total switching losses is mathematically shown to be 42% compared with the standard center-aligned PWM scheme used with the converter. A PSpiceTM simulation of the new scheme reveals soft-switching waveforms. Practical results are given to support the simulation results and heat-sink temperature rise results show a reduction in heat-sink temperature rise for the new scheme compared to the old

AB - A new soft-switching PWM scheme for a three-phase, AC-DC, step-down unity power factor converter is described. The main advantage of the scheme is that it requires no additional hardware components to achieve a combination of zero current and voltage turn-off and zero and reduced voltage turn-on. The scheme relies on the repositioning of the PWM pulses within the carrier period to obtain natural commutation from one switching device to the next. The theoretical reduction in the total switching losses is mathematically shown to be 42% compared with the standard center-aligned PWM scheme used with the converter. A PSpiceTM simulation of the new scheme reveals soft-switching waveforms. Practical results are given to support the simulation results and heat-sink temperature rise results show a reduction in heat-sink temperature rise for the new scheme compared to the old

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KW - PWM power convertors

KW - SPICE commutation

KW - switching circuits

KW - power systems

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