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Analysis of PWM strategy for reduction of conducted electromagnetic interference in an adjustable-speed AC motor drive
(2013-01-01)
Jettanasen, C.
This paper presents various pulse width modulation (PWM) strategies capable of reducing conducted electromagnetic interference (EMI) generated in PWM voltage-source inverter systems. EMI problems caused by both conducted and radiated noise emissions have become a great concern in electrical/electronic systems. Thus, their effects are currently considerably taken into account in circuit design phase in order to restrict or reduce these severe problems. The proposed PWM strategy, which is one of different traditional and/or novel reduction techniques to solve such a problem, is chosen as an EMI reduction method and studied herein. The simulated results show that active vector PWM strategy seems to be a good alternative for inverter system. The impact of dead time of PWM signals is also investigated and discussed. © 2013 Praise Worthy Prize S.r.l. - All rights reserved.
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Modeling and optimizing a passive EMI filter to attenuate common-mode currents at high frequency in a three-phase adjustable-speed AC motor drive
(2012-10-01)
Jettanasen, Chaiyan
This paper proposes a novel optimization approach of a passive electromagnetic interference (EMI) filter using two-port network technique to reduce or minimize common-mode (CM) conducted noise emissions in a three-phase adjustable-speed AC motor drive. This parasitic current is generally generated by a Pulse Width Modulation (PWM) inverter, an essential part in adjustable-speed AC motor drive systems widely used in many industrial and/or avionic applications, and causes severe EMI problems, in particular at high frequencies (HF); this restricts power electronic drive's evolution. The proposed EMI filter is designed by optimizing its elements values by taking into account real impedances of each part of the considered system,. This approach is contrary to commercial EMI filters typically designed by considering internal impedance of disturbance source and load, equal to 50 Ω/50 Ω, 0.1 Ω/100 Ω or 100 Ω/0.1 Ω. These do not represent the real impedances of the system; thus employing the latter EMI filter would make EMI minimization less effective. The efficiency of the proposed optimization method will be confirmed by comparing the minimized CM current spectra, in frequency domain, to an applied normative level such as EN55011 or DO-160D standards. © ICIC International 2012.
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Simplified conducted electromagnetic interference prediction for DC-DC converters
(2010-12-01)
Tarateeraseth, Vuttipon
The aim of this paper is to provide a simplified methodology for conducted electromagnetic interference (EMI) predictions of DC-DC converters using two classical simulation approaches: time domain and frequency domain simulations. The boost converter is investigated and modeled using information provided by manufacturers without any measurements beforehand. By proposed simulation techniques, it is possible to fast approximate conducted EMI with reasonable accuracy at design stage. Finally, the validity of proposed models is proved by comparing the simulated results with measured results in terms of common mode, differential mode and total noises at frequency range from 150 kHz to 30 MHz.
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Novel method for predicting PCB configurations for near-field and far-field radiated EMI using a neural network
(2003-01-01)
Aunchaleevarapan, Kraison
;
Paithoonwatanakij, Kitti
;
Khan-Ngern, Werachet
;
Nitta, Shuichi
The Neural Network (NN) is applied to recognize basic PCB configurations using its magnetic near-field spectra and radiated far-field emission. The learning process is accomplished by using the computed spectra of the radiated field from PCBs having different configurations. The anomaly is detected through the monitoring of the spectra's amplitude frequency by injecting a voltage pulse at the PCB configuration. The trained NN is then applied to the identification of PCB layouts from radiated emission measurements. The trained NN can identify all of those PCB configurations from the magnetic near-field spectra and the radiated far-field EMI. Moreover, the calculated results of the NN are compared with the actual far-field measurements and other models for evaluation. Finally, the NN used for predicting far-field emission from their magnetic near-field measurement is proposed. Experiments show that the NN can predict the far-field spectra from the magnetic near-field spectra.
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The lump-ideal-component (LIC) switch micro signal concept for the conducted emission analysis
(2002-01-01)
Tantisukarom, C.
;
Tarateeraseth, V.
;
Khan-ngern, W.
;
Nitta, S.
In this paper, the Lump-Ideal-Component (LIC) switches concept is proposed. The micro level signal using conventional ideal on-off switch is not realized in the large or small signal analysis. With the proposed switch concept, the micro signal can be fundamentally derived at the switch. It leads to the possibility to form the dc-dc converter micro signal model of the conducted emission analysis using the proposed lump-ideal-component switches concept.
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Conducted emission characteristic of active snubber boost converter
(2001-12-01)
Tantisukarom, C.
;
Khan-ngern, W.
;
Nitta, S.
In this paper, the conducted emission characteristics of active snubber boost converter with proposed timing diagram are compared with the conventional boost converter. It is theoretically said that soft switching techniques can reduce the high switching dv/dt and di/dt rate, and as a result, it therefore could reduce EMI noise generated by hard switching. However, with increasing number of switching elements, major rate of change is still imposed on either switches, the effectiveness of soft switching technique from presented active snubber boost converter to mitigate conducted emission is considerably limited.

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