An approach to realize higher power PWM AC controller

Enjeti, P.N.; Choi, Sera

doi:10.1109/apec.1993.290613

Cited by 72 publications

(25 citation statements)

References 6 publications

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“…1). The switching strategy employed is a four-step switching technique [6] which facilitates high frequency PWM operation of a bi-directional switch feeding an inductive load. This simple control approach eliminates the use of snubbers as voltage spikes are minimum.…”

Section: Discussionmentioning

confidence: 99%

“…The voltage w, (see Fig. 1) can be expressed as (6) This high frequency voltage is then rectified at the secondary side of the isolation transformer and processed via a filtering stage to obtain a dc output. Fig.…”

Section: A Analysis Of Resonant Stagementioning

confidence: 99%

“…And the modulation index is set at m = 0.5 to yield the maximum fundamental switching frequency component of output voltage. The time distance between each step in the 4-step switching strategy [6] employed to the ac-controller is set at 1 ps. Finally, the converter is operated at 10 kHz switching frequency.…”

Section: A Analysis Of Resonant Stagementioning

confidence: 99%

“…The use of the resonant circuit will reduce switching losses and stresses on the switching semiconductor. The four-step switching technique used in the ac-toac converter will yield safe-switching and eliminate the need for snubbers in the bi-directional switches [6]. Reduction in component count and number of semiconductors in the power flow path.…”

mentioning

confidence: 99%

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A series resonant AC-to-DC rectifier with high-frequency isolation

Sulistyono

Enjeti

1995

IEEE Trans. Power Electron.

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In this paper, a new series resonant ac-to-dc rectifier with high-frequency isolation is introduced. The proposed approach employs a PWM controlled ac controller, a series resonant tank and a high-frequency isolation transformer. With this approach, the single phase input ac is directly processed via the ac-to-ac converter eliminating the ac-to-dc rectification stage present in the conventional system. The output of the HF transformer is rectified and processed via a filtering stage to obtain a dc output. With the addition of an input filter, the input current is near sinusoidal at unity power factor. Simulation and experiment results are presented to verify the basic concept. Hi gh Frequency Oulput Reclifer

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Section: Discussionmentioning

confidence: 99%

Section: A Analysis Of Resonant Stagementioning

confidence: 99%

Section: A Analysis Of Resonant Stagementioning

confidence: 99%

mentioning

confidence: 99%

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A series resonant AC-to-DC rectifier with high-frequency isolation

Sulistyono

Enjeti

1995

IEEE Trans. Power Electron.

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“…the 3x3-matrix does not need to be extended for normal operation [11][12]. The switching sequence between the bi-directional switches of a partial converter takes place thereby in dependency of the phase to phase input voltage sign.…”

Section: A Four Step Commutationmentioning

confidence: 99%

Power loss comparison of different matrix converter commutation strategies

Schulte

Schroder

2012

2012 15th International Power Electronics and Motion Control Conference (EPE/PEMC)

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In this paper it is shown, how the power losses of a matrix converter using different commutation strategies can be determined by experimental methods and by simulation models. A comparison of the obtained power losses is presented as the main research result. Basis of this study is a laboratory prototype of a matrix converter, which uses a so-called switchable free-wheeling circuit for load current commutation and for protection purposes. During commutation sequences proceed in the 3x3-matrix the inductive load current is taken over by the free-wheeling circuit without load current interruptions and thus no dangerous overvoltage can occur. A high precision power analyzer is used to gauge the conduction and switching losses of the laboratory prototype. The measurement results are compared to the power losses calculated by a simulated four step commutation strategy. The applied four-step commutation is a commutation procedure, which gets by without additional protection hardware, i.e. the 3x3-matrix does not need to be extended for normal operation. The analysis considers the power losses and the converters efficiency depending on the switching frequency of the space vector modulation.

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Power quality improvement using integral-PWM control in an AC/AC voltage converter

Nigim

Heydt

2002

Electric Power Systems Research

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An approach to realize higher power PWM AC controller

Cited by 72 publications

References 6 publications

A series resonant AC-to-DC rectifier with high-frequency isolation

A series resonant AC-to-DC rectifier with high-frequency isolation

Power loss comparison of different matrix converter commutation strategies

Power quality improvement using integral-PWM control in an AC/AC voltage converter

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