Random modulation techniques with fixed switching frequency for three-phase power converters

Bech, Michael Møller; Blaabjerg, Frede; Pedersen, John Kim

doi:10.1109/pesc.1999.789069

Cited by 28 publications

(32 citation statements)

References 17 publications

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“…on, the optimum hopping n would be (12) h (Top), frequency with frequency with optimum peed the frequency spectrum n one frequency hopping a monotonic decrease of f pulses.…”

Section: E Dependency Of Emi On Motor Spmentioning

confidence: 99%

“…Extensive research has been carried on EMI reduction with majority of the schemes based on some form of dithering in the switching frequency or switching sequence [1] [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. However, some alternative pathways had also been explored.…”

Section: Introductionmentioning

confidence: 99%

“…The industry tends to favor more software oriented approaches for consumer electronic devices or vehicles, and there have been several such methods developed through modifying the PWM switching pattern [1][3] [6][7][8][9][10][11][12][13][14][15][16][17][18]. In [8], a method was proposed where a random delay had been introduced in the switching frequency based on randomizing the switching pattern of the power electronic converter.…”

Section: Introductionmentioning

confidence: 99%

“…The researchers in [10][11] presented the benefits and success of using the random PWM techniques in EMI reduction by decreasing the quasi peak values of the harmonic frequencies. In [12][13], another method of dithering was researched on where the PWM pulse was phase shifted at a fixed frequency; however, this was not suitable as its operation required the use of an extra current sensor. Other methods such as the one presented in [14][15][16] require a large frequency variation which is not ideal for components designed for operating at a small frequency variation window.…”

Section: Introductionmentioning

confidence: 99%

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A chirp PWM scheme for brushless DC motor drives

Uddin

Husain

Mitra

et al. 2012

2012 IEEE Energy Conversion Congress and Exposition (ECCE)

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A novel chirp pulse width modulation (CPWM) scheme is proposed to improve the performance of AC motor drives by reducing electromagnetic interference. The proposed CPWM is operated on the chirped waveform that has a specified bandwidth defined within a minimum and a maximum switching frequency. The design procedure of CPWM that includes selecting the chirp bandwidth and the PWM frequency sweeping time period is presented and analyzed. Then the theoretical analysis is done for both the chirped and non-chirped waveforms. Optimum EMI reduction scheme is developed from the theory. The computer simulation and experimental results verify that the proposed CPWM method has better performance in comparison to PWM with fixed frequency.Index Terms -Chirp pulse width modulation (CPWM), electromagnetic interference (EMI), Brushless DC drives, frequency dithering.

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“…on, the optimum hopping n would be (12) h (Top), frequency with frequency with optimum peed the frequency spectrum n one frequency hopping a monotonic decrease of f pulses.…”

Section: E Dependency Of Emi On Motor Spmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A chirp PWM scheme for brushless DC motor drives

Uddin

Husain

Mitra

et al. 2012

2012 IEEE Energy Conversion Congress and Exposition (ECCE)

View full text Add to dashboard Cite

show abstract

“…To decrease the number of switching during a modulation period, reducing in this way the switching losses, several discontinuous modulation methods are proposed in [2]. The random distribution of the time-length used for generation of zero voltage vectors, gives rise to several Fixed Carrier Frequency Random PWM (FCF-RPWM) methods [3]. The advantage of random PWM is its flat spectrum, which ameliorates the acoustic noise generated by the switching.…”

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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Development of optimised carrier sequence in MCU-based random-frequency PWM

Chen¹,

Chang²,

Huang³

2007

IET Electr. Power Appl.

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The effect of the carrier sequences on the voltage spectrum of MCU(microcontroller)based random-frequency pulse-width modulation (RFPWM) is presented. To optimise the carrier sequence efficiently, first all possible sequences are classified into groups according to the time-shift and time-reverse properties of the Fourier transform. Then, some evaluation indexes are proposed to obtain the optimal sequence quickly with the end of a personal computer (PC). Finally, some optimised carrier sequences with only two carrier frequencies are recommended. The experimental results also indicate that we should pay more attentions to the carrier sequences than to the selection of carrier frequency and on the numbers of carrier frequencies.

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Random modulation techniques with fixed switching frequency for three-phase power converters

Cited by 28 publications

References 17 publications

A chirp PWM scheme for brushless DC motor drives

A chirp PWM scheme for brushless DC motor drives

High flexibility and low cost digital implementation for modern PWM strategies

Development of optimised carrier sequence in MCU-based random-frequency PWM

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