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Modulation index

About: Modulation index is a(n) research topic. Over the lifetime, 3216 publication(s) have been published within this topic receiving 43061 citation(s). more


Journal ArticleDOI: 10.1109/28.87265
Abstract: A space vector concept for deriving the switching times for pulsewidth-modulated voltage source inverters is compared with the conventional sinusoidal concept. The switching times are deducted from assumptions for minimum current distortion, the resulting mean voltage values are shown, and the differences between these and the established sinusoidal PWM (pulse-width modulator) are elaborated. Based on an analytical calculation the current distortions and torque ripples are evaluated and compared with the values obtained with the conventional method. The space vector representation results in lower current harmonics and possibly a higher modulation index. A modulator based on an 8086 microprocessor has been implemented, and its performance is reported. > more

Topics: Voltage source (58%), Modulation index (53%), Pulse-width modulation (53%) more

1,668 Citations

Journal ArticleDOI: 10.1109/TPEL.2005.850927
Abstract: This paper explores control methods for the Z-source inverter and their relationships of voltage boost versus modulation index. A maximum boost control is presented to produce the maximum voltage boost (or voltage gain) under a given modulation index. The control method, relationships of voltage gain versus modulation index, and voltage stress versus voltage gain are analyzed in detail and verified by simulation and experiment. more

Topics: Z-source inverter (61%), Modulation index (60%), Inverter (51%) more

769 Citations

Journal ArticleDOI: 10.1109/TIA.2006.872927
Miaosen Shen1, Jin Wang2, A. Joseph1, Fang Zheng Peng1  +2 moreInstitutions (4)
Abstract: This paper proposes two constant boost-control methods for the Z-source inverter, which can obtain maximum voltage gain at any given modulation index without producing any low-frequency ripple that is related to the output frequency and minimize the voltage stress at the same time. Thus, the Z-network requirement will be independent of the output frequency and determined only by the switching frequency. The relationship of voltage gain to modulation index is analyzed in detail and verified by simulation and experiments. more

Topics: Z-source inverter (64%), Pulse-frequency modulation (59%), Modulation index (58%) more

644 Citations

Journal ArticleDOI: 10.1109/TCOM.1981.1095001
Tor Aulin1, C.-E. Sundberg1Institutions (1)
Abstract: The continuous phase modulation (CPM) signaling scheme has gained interest in recent years because of its attractive spectral properties. Data symbol pulse shaping has previously been studied with regard to spectra, for binary data and modulation index 0.5. In this paper these results have been extended to the M -ary case, where the pulse shaping is over a one symbol interval, the so-called full response systems. Results are given for modulation indexes of practical interest, concerning both performance and spectrum. Comparisons are made with minimum shift keying (MSK) and systems have been found which are significantly better in E_{b}/N_{0} for a large signal-to-noise ratio (SNR) without expanded bandwidth. Schemes with the same bit error probability as MSK but with considerably smaller bandwidth have also been found. Significant improvement in both power and bandwidth are obtained by increasing the number of levels M from 2 to 4. more

Topics: Minimum-shift keying (63%), Continuous phase modulation (62%), Modulation index (59%) more

524 Citations

Journal ArticleDOI: 10.1109/TPEL.2009.2020902
Abstract: A switching control strategy to control the power flow and minimize the total power losses of the dual active bridge converter topology is proposed in this paper. The control strategy consists of driving the bridge with the largest DC voltage to generate a three-level pulsewidth-modulated (PWM) voltage waveform. This PWM is ruled by two manipulated variables: the phase shift between the primary and secondary transformer voltages and the modulation index. These variables are calculated using an algorithm that is deduced on the basis of particular calculation and analysis of converter losses, which are also presented in this paper. An experimental prototype was implemented to validate the theoretical analysis and feasibility of the proposal. The experimental results revealed that the overall efficiency of this converter can be improved up to 10% using the control strategy instead of the conventional one. more

Topics: Forward converter (64%), Pulse-width modulation (54%), Transformer (51%) more

407 Citations

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Topic's top 5 most impactful authors

Bin Wu

22 papers, 942 citations

Gabriele Grandi

14 papers, 293 citations

Leon M. Tolbert

13 papers, 1.3K citations

Navid R. Zargari

12 papers, 342 citations

Minh-Khai Nguyen

11 papers, 180 citations

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