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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...
This paper presents a new device for testing and investigating conducted disturbances with simultaneous key parameter measurements. The common and differential modes form line and neutral are simultaneously measured to provide the proper common and differential modes levels. Design techniques for a line impedance stabilization network are focused on the improvement of air core inductor design for...
This paper proposes the input impedance measurement technique of a switching mode power supply (SMPS) by the insertion loss approach. The insertion loss approach with the assumption condition is described. The common mode and the differential mode impedance are the key parameters which can be used to design the EMI filter effectively.
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...
This paper presents the comparison the conducted electromagnetic interference (EMI) emission of lamps. The test set has been gotten public favor that consists of typical lamps. The types of lamp, such as incandescent lamp (40 W), new compact fluorescent lamp or energy saving lamp or Lord-Ta-Keab in Thai (8 W), compact fluorescent lamp with magnetic core ballast (36 W), and compact fluorescent lamp...
This paper presents the analysis of conducted electromagnetic interference (EMI) reduction on a boost converter using of progressive winding on the inductor. Two layer of inductor winding is modeled. The EMI of a boost converter can be caused by switching dv/dt rates and interacting with parasitic capacitance in the inductor. This paper focuses on the modeling and analysis on the parasitic capacitance...
This paper presents the comparison of conducted electromagnetic interference (EMI) and electrical performances effect on various high frequency transformer winding techniques. The windings techniques are focused on conventional winding, sandwiched winding and interleaved winding techniques of the flyback converter. Those winding techniques result a variation of parasitic capacitance which can cause...
This paper presents improved and simplified methods to design passive EMI filter of the common-mode noise mitigation complied with CISPR 14 or EN 55014; conducted <700 W, Motors. The proposed design procedure of common-mode (CM) filter uses approximation function based on high-order Butterworth function to achieve not only the complied conducted noise but also the transfer function of the filter...
The analysis and design of line impedance stabilization network (LISN) is presented. The details will be described how to design and stabilize the impedance of LISN at frequency range 150 kHz to 30 MHz following CISPR 16-1 standard. The impedance response of passive components: resistor, inductor and capacitor will be measured to identify the component parasitic. The comparison of simulated and measured...
Most design engineers still believe that with a good shielded enclosure, well-shielded cables and high-performance ferrite sleeves, EMI compliance will be a straight forward task. This paper demonstrates experimentally that a poor PCB layout can cause electronic product to fail EMI specification badly even with all these fixes
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...
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...
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