Asymmetric Carrier Random PWM

Máthé, László; Lungeanu, F.; Rasmussen, Peter Omand; Pedersen, John Kim

doi:10.1109/isie.2010.5636898

Cited by 9 publications

(6 citation statements)

References 13 publications

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“…Generally, there are many numbers for k that satisfy Equations (12) and (13), and the general formulas for f kmax and f kmin corresponding to each k are shown in Equations (14) and (15), where f kmax and f kmin are the maximum and minimum values of the switching frequencies corresponding to k. It can be seen from Equations (14) and (15) that the switching frequency of the inverter decreases with increasing k, or increases with decreasing k.…”

Section: Random Number K and Its Corresponding Extreme Value Of Switcmentioning

confidence: 99%

“…As shown in Figure 4, the frequency to be eliminated (f 0 ) and the maximum value (f max ) and minimum value (f min ) of the instantaneous switching frequency are given in advance. The D max and D min are calculated according to the modulation ratio M. The range of the random number k can be acquired with the mentioned conditions inserted in Equations (12) and (13). T n+1 can be calculated with T n and D n inserted in Equation 10when k is selected.…”

Section: Calculation Process For Selective Harmonic Cancellationmentioning

confidence: 99%

“…As shown in Figure 1, RPWM can mainly be classified as 1) random switching frequency pulse width modulation (PWM) [2], 2) random pulse position PWM, 3) random switching PWM [3], 4) or hybrid random PWM [4]. According to the randomness of the pulse position, it can be divided into random lead-lag [5], random zero vector [6], random pulse center displacement [7], random pulse position [8], random phase-shifted PWM [9], variable delay random PWM [10], asymmetric carrier random PWM [11], single random pulse position [12], and fractal space vector modulation [13]. However, the traditional RPWM cannot suppress specific harmonics selectively, such as the resonance frequency of motors and other loads.…”

Section: Introductionmentioning

confidence: 99%

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A Novel RPWN Selective Harmonic Elimination Method for Single-Phase Inverter

Liu

et al. 2020

Electronics

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In the existing random pule width modulation (RPWM) selective harmonic elimination methods, the formula of switching cycle TN+1 is complex, and the duty ratio DN+1 of the next switching cycle needs to be calculated in advance. However, in the case of unknown TN+1, DN+1 is also difficult to calculate accurately, and the two parameters are based on each other. A novel selective harmonic elimination method in RPWM is proposed in this paper. The PWM voltage pulse is placed at the back of the switch cycle, which simplifies the formula of the switch cycle TN+1 and eliminates the need to calculate the duty ratio DN+1. Two kinds of RPWM selective harmonic elimination ideas are summarized. The general formulas of the switch cycle, the effective random number k, and the upper and lower limits of switch frequency corresponding to k are derived. The spectrum shaping of inverter output voltage can be realized without using digital filter in this method. Simple algorithm, small calculation and easy implementation are characteristics of the proposed method. The simulation and experimental results confirm the ability of the proposed method for reducing harmonics at the specific frequency in power spectral density (PSD).

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Section: Random Number K and Its Corresponding Extreme Value Of Switcmentioning

confidence: 99%

Section: Calculation Process For Selective Harmonic Cancellationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Novel RPWN Selective Harmonic Elimination Method for Single-Phase Inverter

Liu

et al. 2020

Electronics

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“…Separately randomized pulse position (SRP) [33] Pulses are placed randomly in switching interval as shown in Figure 13. As there is full possibility to place pulse anywhere, a control for full range of MI is possible, as far as switching sequence is maintained.…”

Section: )mentioning

confidence: 99%

An Investigation on the Performance of Random PWM Controlled Converters

Jadeja

Ved

Chauhan

2015

Eng. Technol. Appl. Sci. Res.

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This paper provides an insight on various random pulse width modulation techniques and their effect on spreading the harmonic spectrum for various applications like drives, hybrid electric vehicles and renewable energy sources, for two level as well as three level inverter. Acoustic noise reduction, electromagnetic interference conducted and torque ripple are obvious advantages of random pulse width modulation (PWM). PWM converters with multilevel topology can meet with global quality standards for power supplies. The random PWM technique provides additional advantages. Among others, it may be implemented to achieve switching loss equalization in power switches for cascaded H-Bridge multilevel inverters. This paper provides in depth understanding for different random PWM techniques and their applications.

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“…In [10] Hava analyzed different reduced common mode voltage modulation techniques, and in [11] presents an implementation method for this modulation methods by using the PWM unit of a microcontroller. In [12] a FCF-RPWM technique is presented where an asymmetrical carrier wave is proposed in order to spread the discrete components from the spectrum. A method for implementation of the modulation technique by using the PWM module from a microcontroller is also proposed.…”

Section: Introductionmentioning

confidence: 99%

High flexibility and low cost digital implementation for modern PWM strategies

Máthé

Séra

Kerekes

et al. 2011

IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society

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In this paper a new low cost technique for PWM strategy implementation is presented. The proposed technique does not require dedicated hardware PWM units, thus offering higher flexibility of use. Furthermore, the aforementioned method eases the digital implementation of modern modulation methods like AZSPWM, NSPWM, or ACRPWM. By using a conventional PWM unit from a microcontroller, these modern modulation techniques are often difficult, or even impossible, to implement. The proposed method can be used to implement PWM strategies even for those microcontrollers which are not equipped with hardware PWM unit. The experimental results show that this new technique is suitable to replace traditional implementation methods with minimum computational overhead, with the benefit of high flexibility, lower cost and faster code development.

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Asymmetric Carrier Random PWM

Cited by 9 publications

References 13 publications

A Novel RPWN Selective Harmonic Elimination Method for Single-Phase Inverter

A Novel RPWN Selective Harmonic Elimination Method for Single-Phase Inverter

An Investigation on the Performance of Random PWM Controlled Converters

High flexibility and low cost digital implementation for modern PWM strategies

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