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Step by step investigation of near field radiated mitigation at an IT computer board
(2008-09-19)
Zenkner, H.
;
Khan-Ngern, W.
This paper demonstrates the magnetic near field coupling between two ports at a computer board. Based on a failed radiated emission measurement result the coupling is found by evaluation with a probe and a spectrum analyzer and different electronic modifications like filtering and cable routing. The electromagnetic filed mitigation at a parallel port with integrated capacitors is based on the maximum efficiency which is determined by the impedances of noise source, peripheral cables and filter capacitors.
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The study of electric field effect to bending on the growth of the primary root of rice
(2008-09-19)
Rotcharoen, T.
;
Khan-Ngern, W.
;
Nitta, S.
The growing of rice seeds (Oryza sativa L.) on a primary root stage are experimented under the condition with electric field at 28.5 kV/m varied electrode in horizontal direction and without electric field. This work is focused on the bending of the root direction were measurement the space angle after 8, 16 and 24 hour. These values with E-field and without E-field are compared. The result indicate that the majority direction of root is bended to negative electrode.
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Possibility of electromagnetic shielding using salt transparency liquid
(2008-09-19)
Udomsinsirikul, T.
;
Khan-Ngern, W.
This paper presents the properties of electromagnetic interference (EMI) shielding with transparency liquid in many cases of quantity of salt from 0% to 20% concentrate solution. The comparison is done under semi-anechoic chamber at 3 meter distance with Bilog antenna from 30 MHz to 1,000 MHz frequency range. It is found that in higher salt concentrate solution results a trend of high EMI shielding performance up to 23 dB.
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Passive EMI filter performance improvements with common mode voltage cancellation technique for PWM inverter
(2007-12-01)
Khun, C.
;
Khan-Ngern, W.
;
Kando, M.
The common modulation strategy adopted for motor control in adjustable speed drives (ASDs) is pulse width modulation (PWM). The carrier frequency along with fast rise and fall time of the IGBTs employed results in non trivial common-mode (CM). The high dv/dt and di/dt causes shaft-voltage, which leads to bearing currents. This phenomenon has been well-known as one of the reason for premature bearing failure in PWM drive motors. To reduced EMI emission, this paper presents the experimental works that investigate the conducted emission from pulse width modulated (PWM) inverter feeding an induction motor using CM voltage cancellation technique to develop the ability of conventional passive EMI filter. The typical passive EMI filter also use in this work to compare and prove the effectiveness proposed method. The experimental results of two operation conditions: with load and without load are verified the effectiveness of proposed filters, respectively. © 2007 IEEE.
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Design of the two parallel inverter modules by circular chain control technique
(2007-12-01)
Piboonwattanakit, K.
;
Khan-Ngern, W.
This paper presents the design technique of two parallel inverters. The parallel inverter can be shared the power with efficiently. The proposed technique is presented using the circular chain control (3C) to manage two parallel inverters operation. The inverter control is used by dsPIC 30F4011. The two set of 50 watt inverter are prototyped. The flowchart of operating condition is proposed to maintain the power sharing and the system efficiency. The simulated result using Simulink program confirms the agreement with the experimental results. © 2007 IEEE.
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Design of high performance and low cost Line Impedance Stabilization Network for university power electronics and EMC laboratories
(2007-12-01)
Sakulhirirak, D.
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Tarateeraseth, V.
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Khan-Ngern, W.
;
Yoothanom, N.
This paper proposes how to analyze and design the Line Impedance Stabilization Network (LISN). The details are described component characteristics and how to design air coil inductors in single and multi layers based on a high self resonant frequency response concept. According to the CISPR 16-1 standard, the stabilized impedance 50 Ω of LISN at frequency range 150 kHz to 30 MHz is proved by simulation and experimental results. The proposed LISN is successful design the low cost by compare with commercial LISN. Finally, the performance of the proposed LISN is achieved comparing to CISPR standard and also with commercial LISN. © 2007 IEEE.
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A new integrated inductor with balanced switching technique for common mode EMI reduction in high step-up DC/DC converter
(2006-01-01)
Dumrongkittigule, T.
;
Tarateeraseth, V.
;
Khan-Ngern, W.
This paper proposes a new integrated inductor with balanced switching technique applied for high step-up converter. The advantage of the proposed converter is the reduction of the common mode conducted EMI using balanced switching technique. This step-up converter requires more magnetic components than that of the conventional converter. Therefore, the integrated magnetic technique is proposed to reduce two separated coupled inductors into a single core inductor. Finally, the good feature of proposed converter, by reducing common mode conducted EMI with small amount of inductors, is confirmed by the experimental results of a 50 W converter.
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The conducted electromagnetic interference of small grid connected inverter to power system
(2006-01-01)
Khamphakdi, P.
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Tarateeraseth, V.
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Karanun, K.
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Khan-Ngern, W.
This paper presents the effect of conducted electromagnetic interference emission and harmonics distortion generated from a single phase small grid connected inverter to power system. Controlling technique is sinusoidal pulsewidth modulation (SPWM) for a bipolar voltage switching inverter. Modulation index, switching frequency and power flow are key parameters to control the conducted electromagnetic interference and harmonics on the 200W inverter based on the lab testing.
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Source Identification of Electromagnetic Radiation in Electronic Circuits Using Artificial Neural Network
(2005-01-01)
Aunchaleevarapan, K.
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Intajag, S.
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Khan-Ngern, W.
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Preampaneerach, Y.
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Teekaput, P.
The Artificial Neural Network (ANN) is applied to recognize different models of a dipole-like antenna and a loop-like antenna using its radiated emission patterns, which are radiated from the electronic circuits. The radiated patterns, which are detected through the monitoring of the amplitude emitting from the antenna-like structures, are used to train the ANN. The electronic circuits (source) have various configurations that provide the different patterns; however, the trained ANN can identify the configurations all of those structure-like antennae from the radiated emission pattern measurements.
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The study of rice growing with the electromagnetic field effect simulated from 300 kV switching substation
(2003-01-01)
Rotcharoen, T.
;
Khan-Ngern, W.
;
Nitta, S.
In this paper, the effect of an electric field on the growth of rice plants is studied. The research is focused on an electric field. The comparison is done under the conditions with electric field at 28.5 kV/m and without electric field. The rice plants are experimented with under the condition of the electric field. Rice is laid transversely and horizontally, respectively. The results with the electric field are compared to those without electric field. It is found that the rice plant growth with electric field has a high growth rate of the height of stems and the length of roots more so than in the case without the electric field.

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