Topic
Conducted electromagnetic interference
About: Conducted electromagnetic interference is a research topic. Over the lifetime, 1857 publications have been published within this topic receiving 20614 citations.
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Patent•
20 Oct 1999
TL;DR: In this article, a method and system for shielding electrical components from electromagnetic waves is described, in which the enclosure is lined with layers of lead and copper, electrically connected to wires that route electricity generated by an electromagnetic wave to a halo of wire on the ceiling.
Abstract: A method and system for shielding electrical components from electromagnetic waves is provided. The enclosure is lined with layers of lead and copper. These layers are electrically connected to wires that route electricity generated by an electromagnetic wave to a halo of wire on the ceiling. The halo is connected to one or more ground windows which in turn are connected to a wire that runs the current into a ground so as to provide maximum protection to the electrical components by shielding them from the electromagnetic wave and any current generated thereby.
643 citations
471 citations
TL;DR: In this article, a PWM switching strategy was proposed to eliminate common mode voltage using the open-end winding configuration for the induction motor using a single dc-link with half the voltage compared to the conventional three-level inverter based scheme.
Abstract: Pulse-width modulated (PWM) inverters are known to generate common mode voltages which cause motor bearing currents in the induction motor drives. They also result in leakage currents which act as sources of conducted electromagnetic interference in the drive system. The common mode voltage generated by a conventional three-level inverter can be eliminated by switching only the voltage space vectors which do not produce the common mode voltage. This paper presents a PWM switching strategy to eliminate common mode voltage using the open-end winding configuration for the induction motor. The switching strategy presented in this paper, does not generate any alternating common mode voltages in the drive system and hence the electrostatic coupling of the common mode voltage, which results in the bearing currents and the leakage currents, is avoided. The proposed scheme is devoid of neutral point voltage fluctuations and does not require neutral point clamping diodes, when compared to the common mode elimination scheme based on the conventional three-level inverter topology. Also, the present scheme uses a single dc-link with half the voltage compared to the conventional three-level inverter based scheme.
456 citations
22 Jun 1997
TL;DR: In this article, an active common-noise canceler (ACC) is proposed to eliminate the common-mode voltage produced by a PWM inverter, which can prevent an electric shock on a nongrounded motor frame and suppress motor shaft voltage.
Abstract: This paper proposes an active common-noise canceler (ACC) that is capable of eliminating the common-mode voltage produced by a pulsewidth modulation (PWM) inverter. An emitter follower using complementary transistors and a common-mode transformer are incorporated into the ACC, the design method of which is also presented in detail. Experiments using a prototype ACC, whose design and construction are discussed in this paper, verify its viability and effectiveness in eliminating common-mode voltage in a 3.7 kW induction motor drive using an insulated gate bipolar transistor (IGBT) inverter. Some experimental results show that the ACC makes significant contributions to reducing a ground current and a conducted electromagnetic interference (EMI). In addition, the ACC can prevent an electric shock on a nongrounded motor frame and can suppress motor shaft voltage.
379 citations