Results 171 to 180 of about 5,546 (208)

Practical real-time PWM modulators: an assessment

IEE Proceedings B Electric Power Applications, 1992
Many techniques have been proposed for generating PWM waveforms for controlling AC motor drives. The authors demonstrate the practicality of generating real-time, software-based PWM waveforms using low-cost microprocessors. They use a space vector methodology and extend the concept of a computationally efficient trapezoidal modulation strategy to more ...
P.G. Handley, J.T. Boys
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Harmonic analysis of PWM inverter modulation strategies

International Journal of Electronics, 1988
This paper presents the harmonic analysis of various pulse width modulation strategies used for the DC-AC converters. An efficient harmonics computation algorithm for piecewise continuous periodic waveforms has been derived. Fourier coefficients of experimentally obtained waveforms or simulation results can be calculated efficiently.
Y. Y. TZOU, Y. C. WU
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Bandpass pulse-width modulation (BP-PWM)

IEEE MTT-S International Microwave Symposium Digest, 2005., 2005
New transmitter architectures utilizing nonlinear power amplifiers when transmitting linearly modulated signals are studied. The emphasis is on bandpass pulse-width modulation (BP-PWM) for which both theory and implementation proposals are presented.
S. Rosnell, J. Varis
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Multilevel PWM methods at low modulation indices

IEEE Transactions on Power Electronics, 1999
When utilized at low amplitude modulation indices, existing multilevel carrier-based PWM strategies have no special provisions for this operating region, and several levels of the inverter go unused. This paper proposes some novel multilevel PWM strategies to take advantage of the multiple levels in both a diode-clamped inverter and a cascaded H ...
L.M. Tolbert, F.Z. Peng, T.G. Habetler
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PWM technique with partially constant modulating waves

Electrical Engineering, 1999
In this paper, a new method for controlling the amplitude and frequency of the sinusoidal output voltages from the PWM inverter has been presented. By using modulating waves of constant amplitudes on angles of tt/3, the following advantages can be obtained: —Reducing the switchings number in the PWM inverter by 33%; —The fundamental amplitude
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Quick implementation of Pule Wise Modulation(PWM), Pulse Frequency Modulation(PFM) and mixed PWM/PFM on FPGA chip

2020 International Symposium on Computer, Consumer and Control (IS3C), 2020
This paper proposes a method to successfully embedded three control waveforms, PWM (Pulse Width Modulation), PFM (Pulse Frequency Modulation), and PWM-PFM (pulse width frequency modulation), into an FPGA (Field-Programmable Gate Array) chip. The three types of control modulation are generally used in power supply design.
openaire   +1 more source

Modeling a hysteretic modulator's PFM and PWM modes

2017 IEEE Applied Power Electronics Conference and Exposition (APEC), 2017
In this paper, the describing function approach is used to extend the modeling of hysteretic mode control from the PWM mode to the PWM/PFM dual mode. A detailed circuit configuration of the PFM modulator and derivation of the model are introduced.
Yi Huang, Chun Cheung
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Improved delta modulation control for PWM inverters

2008 IEEE International Conference on Industrial Technology, 2008
An improved delta modulation (IDM) controller for pulse width modulation (PWM) inverter is presented in this paper. The proposed IDM use the input reference signal to generate the variable integrating slope for the integrator in order to obtain better control ability.
null Yaow-Ming Chen, null Yung-Chu Chen, null Hsu-Chin Wu   +2 more
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An on-line PC-based converter PWM modulator

Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting, 2003
Developments in power control techniques for pulsewidth-modulated (PWM) inverters are often ignored because of lack of time for adequate testing and evaluation. The programmable PC-based PWM described is designed to alleviate this problem. The modulator is capable of generating, in ready-to-use form, gating signals for any type of PWM scheme and most ...
D. Vincenti, P.D. Ziogas, R.V. Patel
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A hybrid PWM modulation scheme for PV inverter

2013 1st International Future Energy Electronics Conference (IFEEC), 2013
A hybrid PWM scheme for three-level PV inverter is presented. Firstly, modulation schemes are compared with respect to conversion loss with loss breakdown analysis. Then a hybrid PWM scheme is investigated for the PV inverter. The swapping of the PWM scheme is discussed.
Cheng Yan, Chao Sun, Yangfan Zhang, Min Chen, Dehong Xu   +4 more
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