Analysis and spectral characteristics of a spread-spectrum technique for conducted EMI suppression

Tse, K.K.; Chung, Henry Shu-Hung; Huo, Shumin; So, Hing Cheung

doi:10.1109/63.838113

Cited by 136 publications

(33 citation statements)

References 13 publications

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“…Such methods have also been reported to reduce the peak as well as quasi-peak values of conducted electro magnetic interference (EMI) effectively [27], [28]. Random lead-lag (RLL) PWM is a random PWM method which aligns either the turn-on instants of all the phases with the starting instant of the switching interval or the turn-off instants of all the phases with the end of the switching interval in a random fashion.…”

Section: Introductionmentioning

confidence: 99%

Variable-Switching Frequency PWM Technique for Induction Motor Drive to Spread Acoustic Noise Spectrum With Reduced Current Ripple

Kumar

Narayanan

2016

IEEE Trans. on Ind. Applicat.

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Pulse width modulation (PWM) of a motor drive at a fixed switching frequency leads to harmonic currents in narrow bands around integral multiples of the switching frequency, resulting in tonal frequency acoustic noise components which are irritating to the human ear. Random variation of carrier frequency to spread the spectrum poses challenges in device loss calculation, thermal design and closed-loop controller design. Random pulse positioning is not quite effective at high speeds of the drive, where the problem of acoustic noise is most pronounced. This paper proposes a simple variable frequency PWM and evaluates the performance of the same experimentally on a 6-kW induction motor drive. The experimental results show that the acoustic noise is spread uniformly over a range of frequencies without introducing low-frequency current harmonics. Compared to fixed frequency PWM, the dominant acoustic noise is reduced significantly over a wide range of speeds. The variable frequency PWM is further shown to reduce line current total harmonic distortion (THD) at high speeds of the drive. The computational effort required by the variable frequency PWM is only marginally higher than that required by fixed frequency PWM.

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Section: Introductionmentioning

confidence: 99%

Variable-Switching Frequency PWM Technique for Induction Motor Drive to Spread Acoustic Noise Spectrum With Reduced Current Ripple

Kumar

Narayanan

2016

IEEE Trans. on Ind. Applicat.

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“…Spectral spreading using a sinusoidal modulation profile was applied to switching power converters by F. Lin and D. Y. Chen [3]. Other approaches primarily apply chaosbased pulse width modulators [4]- [9] for achieving spread spectrum. Programmable pulse width modulator was proposed in [10], which uses (off-line) optimized timing parameters.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable bi-frequency DPWM with custom spectral shaping in a synchronous buck converter

Kapat

2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Majority of spread spectrum techniques employ chaos-based PWM schemes in a switching power converter, in which neither dynamic performance nor ripple parameter can be correctly predicted so as for efficiency. This paper proposes a bifrequency DPWM controller which uses two discrete frequencies as guided by a modulating signal fm(t). Fourier analysis shows that discrete frequencies only contribute to power spectrum at fundamental and harmonic contents of fm(t). The controller can be easily reconfigured to achieve custom spread spectrum with predictable ripple parameters and insignificant performance impact. Discrete-time models are derived for stability analysis. Design guidelines are discussed for a synchronous buck converter. The proposed method has been implemented using an FPGA device.

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“…Interference emission creates significant electromagnetic compatibility problems. Various methods to reduce power supply emissions have been used through that modulate the switching frequency, such as frequency modulation, random modulation [1,2] . Chaos is the characteristic of nonlinear systems, which can occur naturally in switch-mode power supplies.…”

Section: Introductionmentioning

confidence: 99%

Research on reducing EMI and output voltage ripple of buck converter based on a novel chaos control

Zhenjun¹,

Wang²

2008

2008 Asia Simulation Conference - 7th International Conference on System Simulation and Scientific Computing

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Switching mode supplies usually emit electromagnetic interferences (EMI) at switching frequency and its harmonics. EMI can be reduced by making these systems worked on chaotic state, but this may induce higher output voltage ripple. Based on a new voltage feedback method, Buck converter can display complex nonlinear behaviour. Compared with periodic state, power spectrum of inductance current is improved at chaotic state, the peak values at switching frequency and its harmonics are decreased; the output ripple voltage are also decreased. Pspice simulation results illustrated that this chaos control strategy not only improved the EMC of Buck converters, but also reduced the output voltage ripple obviously. The decrease reason of output ripple voltage has been analyzed.

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Analysis and spectral characteristics of a spread-spectrum technique for conducted EMI suppression

Cited by 136 publications

References 13 publications

Variable-Switching Frequency PWM Technique for Induction Motor Drive to Spread Acoustic Noise Spectrum With Reduced Current Ripple

Variable-Switching Frequency PWM Technique for Induction Motor Drive to Spread Acoustic Noise Spectrum With Reduced Current Ripple

Reconfigurable bi-frequency DPWM with custom spectral shaping in a synchronous buck converter

Research on reducing EMI and output voltage ripple of buck converter based on a novel chaos control

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