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Author: search.filters.author.Jettanasen, ChaiyanSubject: search.filters.subject.electromagnetic interference (EMI)

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    Attenuation of Electromagnetic Interference Generated by High-Frequency Switching Devices
    (2022-01-01)
    Jettanasen, Chaiyan
    ;
    Ngaopitakkul, Atthapol
    ;
    Pothisarn, Chaichan
    A frequency modulation (FM) radio signal receiver is an important device for radio transmitters. The FM radio signal receiver is mounted on the radio transmitter, and its circuit is connected to the electronic system inside the radio transmitter. Therefore, it is necessary to consider the electromagnetic interference (EMI) produced by the FM radio signal receiver to prevent damage caused by interference. This study investigated the EMI characteristics of an FM radio signal receiver in terms of conducted emissions and radiated emissions. The conducted emissions were measured in the frequency range of 150 kHz to 30 MHz and exceeded the CISPR22 standard at frequencies of 370 kHz (-2.4 dB) and 480 kHz (-6.5 dB). The radiated emissions were measured in the frequency range of 30 MHz to 1000 MHz and exceeded the EN55022 standard at a frequency of 33.93 MHz (-13 dB). The conducted emissions were reduced using an axial ferrite bead, while the radiated emissions were attenuated using multipoint grounding and shielding techniques. The axial ferrite beads could attenuate the conducted emissions by 8 dB. The multi-point grounding and shielding techniques attenuated the radiated emissions by approximately 22 dB. These EMI attenuation methods demonstrated satisfactory attenuation performance and resulted in the EMI satisfying the relevant standards.
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    Impact of Electromagnetic Interference Filter Performance in a System without and with Grounding for Supporting the Nanogrid Road Lighting System
    (2021-04-27)
    Jettanasen, Chaiyan
    ;
    Bunjongjit, Sulee
    ;
    Ngaopitakkul, Atthapol
    This study focuses on the comparison of conducted electromagnetic interference (EMI) mitigation for a nanogrid road lighting system, using a passive EMI filter between ungrounded and grounded systems. An inverter was used as the equipment under test in the experiment. The inverter is a power conversion device that receives power from the source and supplies power to the AC electrical load of an LED luminaire. There are two points where the self-generated noises propagate to other nearby devices/equipment. For this reason, this study shows the EMI spectrum from both the DC input and AC output of the inverter. The results of both sides were additionally compared between the two case studies: ungrounded and grounded systems. The real EMI testing results were also compared with the EMI/electromagnetic compatibility standard. The results confirm the effectiveness and benefits of system grounding, integrated with the proposed passive EMI filter.
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    Electromagnetic interference in photovoltaic system and mitigation of conducted noise at DC side
    (2017-02-08)
    Jiraprasertwong, Jukkrit
    ;
    Jettanasen, Chaiyan
    This paper focuses on the electromagnetic interference (EMI) generated in a photovoltaic system. Noise caused by inverter has spread to the disturbance both conducted and radiated emissions. In addition, the EMI can be transferred from one mode to another mode; this means that conducted EMI can be transferred to radiated EMI and vice versa. Several emission patterns in such a system will be described to reveal the possible propagation paths of the EMI. To suppress the high-frequency disturbance, a passive EMI filter is added at the DC side of the solar inverter. The overall system is tested in various configurations: mainly with and without EMI filter, and with and without electrical load connected. Finally, the EMI testing results are compared with EMI standard to confirm the effectiveness and benefits of inserting a passive EMI filter in the studied photovoltaic system.
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    Analysis and mitigation of conducted electromagnetic interference in a photovoltaic single-phase inverter
    (2015-01-26)
    Jiraprasertwong, Jukkrit
    ;
    Jettanasen, Chaiyan
    This paper focuses on analysis and mitigation of conducted electromagnetic interference (EMI) in a single-phase inverter connected to photovoltaic panel. A photovoltaic inverter composed in the considered system is a main part to generate EMI. Many causes of conducted noise emission will be revealed and discussed in the paper. To overcome EMI problems, there are several methods; some mitigation approaches will be herein mentioned, such as grounding, filtering, and reducing parasitic element. In order to effectively reduce EMI in the studied system, passive EMI filter is focused. Simulation and experimental results for two configurations: without EMI filter and with EMI filter are shown and compared with an EMC standard, which is herein EN 55022 class B to reveal the effectiveness of EMI filter and confirm the Electromagnetic Compatibility (EMC) of the system.