Results 151 to 160 of about 5,546 (208)

Low losses modulation of PWM-rectifiers

APEC. Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.02CH37335), 2003
An optimized modulation technique which is specific for PWM-rectifiers is proposed in this paper. It is based on the imposition of modulation frequencies different for the three rectifier legs, selected according to the power modules commutation losses.
ATTAIANESE C, G. TOMASSO
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Improved modulation techniques for PWM-VSI drives

Proceedings of IECON '93 - 19th Annual Conference of IEEE Industrial Electronics, 1997
PWM-VSI based AC motor drives have two main problems. The inverter is nonlinear which causes instability problems in some specific working points of the AC machine and it emits acoustic noise due to the switching frequency. Nonlinearities like dead-time in the inverter, load dependent DC-link voltage ripple and the voltage drop across the switches are ...
Frede Blaabjerg, John Kim Pedersen, Paul Thøgersen   +2 more
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Delta-modulated buck-type PWM converter

IEEE Transactions on Industry Applications, 1992
A delta-modulated, buck-type, three-phase pulse-width modulation (PWM) rectifier is described. The rectifier is of the current source type and is intended to be used in conjunction with controlled current inverters. An outer proportional feedback loop regulates the unidirectional output current flowing through the DC link.
B. Mwinyiwiwa, P.M. Birks, B.-T. Ooi
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Indirect modulation for current source PWM converter

2017 IEEE 26th International Symposium on Industrial Electronics (ISIE), 2017
Compared with carrier based sinusoidal pulse width modulation (SPWM), space vector pulse width modulation (SVPWM) is widely used because of its higher current (voltage) utilization factor. In current source converter (CSC), SVPWM technique is harder to achieve than voltage source converter (VSC). To make the implementation of CSC SVPWM technique easier,
Jialin Zhang, Yiming Zhang 0017, Dakang Yuan   +2 more
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Isolating the Impact of PWM Modulation on Motor Iron Losses

2008 IEEE Industry Applications Society Annual Meeting, 2008
This paper presents an investigation into the impact that PWM harmonics have on iron losses in an induction motor. In order to isolate the effect on iron losses, a special test motor is used, with a plastic rotor cage. The special motor is operated at standstill and input power is measured and allocated as stator copper loss or iron loss.
BOGLIETTI, Aldo, CAVAGNINO, ANDREA, A. M. KNIGHT   +2 more
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Slope modulation strategy for generated PWM

2008 IEEE International Symposium on Industrial Electronics, 2008
A new PWM technique is introduced based on the slope of the signal modulator. The technique was simulated and tested in the laboratory and results show that it generates very high quality voltages with few commutations. It was compared to other recent PWM techniques and achieved higher quality waves and greater fundamental R.M.S.
F. Vargas-Merino, M. J. Meco-Gutierrez, J.R. Heredia-Larrubia, A. Ruiz-Gonzalez   +3 more
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Inductor commutation soft-switched PWM inverter driven by frequency-modulated PWM signal

IEEE Transactions on Power Electronics, 1998
This paper presents a novel technique using frequency modulation (FM) to improve the efficiency of an inductor commutation soft-switched pulse-width-modulation (PWM) inverter (ICSI). In the ICSI, a circulating current for soft switching always flows through the switches of the inverter, independent of the load and input signal.
M. Nagao, K. Harada
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Linearization of Over-Modulation in Dodecagonal Space Vector PWM

2019 IEEE 28th International Symposium on Industrial Electronics (ISIE), 2019
Growing commercial acceptance of electric vehicles (EV) resulted in increased focus on the development of technologies associated with it. This includes research on vehicle charging systems, traction inverters and motors, transmission systems, cooling mechanisms to name a few.
S. Ranjith, R. Sudharshan Kaarthik
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Analysis of nonlinear dynamics in delta modulators for PWM control

2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512), 2004
This paper studies dynamics of the delta modulators for PWM control of inverters. First, we introduce normal form circuit equation and 1-D return map. We then clarify that the system exhibits nonperiodic behavior in wide parameter region. Second, we apply compulsory switching to the circuit.
Hiroshi Shimazu, Toshimichi Saito
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FPGA Implementation and Evaluation of a PWM-Based RF Modulator

2018 Argentine Conference on Automatic Control (AADECA), 2018
In this paper we present a modulator for an all-digital pulse-width modulated (PWM) transmitter based on switching amplification. In this approach, each symbol is represented by a sequence of pre-computed PWM pulse widths stored in a table that results in reduced Error Vector Magnitude (EVM), achieving low distortion with a reduced pulse-rate.
Morales, Juan Ignacio, Chierchie, Fernando, Mandolesi, Pablo Sergio, Paolini, Eduardo Emilio   +3 more
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