Analysis of EMI Terminal Modeling of Switched Power Converters

Bishnoi, Hemant; Baisden, Andrew C.; Mattavelli, Paolo; Boroyevich, Dushan

doi:10.1109/tpel.2012.2190100

Cited by 114 publications

(77 citation statements)

References 30 publications

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“…and the chassis of the body of the EV at high frequency, and introduce the radiation of power cables, shaft voltage and bearing currents in the motor [19,20]. Additionally the EMI emission peaks due to resonances caused by distributed parameters may cause some energy losses of the motor drive system and decrease the efficiency of the system [21][22][23], so the distributed parameters at high frequency in the system should not be neglected anymore for EVs. Therefore, the effect of the distributed parameters on EMI emissions is important for identification of EMI propagation paths and the critical distributed parameters of elements responsible for EMI, and mitigation of EMI emissions [24].…”

Section: Literature Reviewmentioning

confidence: 99%

“…Since the most basic and widely applied full-wave models based on the "black box" approach cannot show the location of the noise source or the propagation path inside the motor power inverter [20,25], some terminal modeling techniques for a two-port network were proposed to predict the conducted EMI [14,21,26]. However, there has never been a theoretical analysis of the parasitic effects of the distributed parameters on EMI noise suppression.…”

Section: Literature Reviewmentioning

confidence: 99%

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The Effect of Distributed Parameters on Conducted EMI from DC-Fed Motor Drive Systems in Electric Vehicles

et al. 2016

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Abstract:The large dv/dt and di/dt outputs of power devices in DC-fed motor drive systems in electric vehicles (EVs) always introduce conducted electromagnetic interference (EMI) emissions and may lead to motor drive system energy transmission losses. The effect of distributed parameters on conducted EMI from the DC-fed high voltage motor drive systems in EVs is studied. A complete test for conducted EMI from the direct current fed(DC-fed) alternating current (AC) motor drive system in an electric vehicle (EV) under load conditions is set up to measure the conducted EMI of high voltage DC cables and the EMI noise peaks due to resonances in a frequency range of 150 kHz-108 MHz. The distributed parameters of the motor can induce bearing currents under low frequency sine wave operation. However the impedance of the distributed parameters of the motor is very high at resonance frequencies of 500 kHz and 30 MHz, and the effect of the bearing current can be ignored, so the research mainly focuses on the distributed parameters in inverters and cables at 500 kHz and 30 MHz, not the effect of distributed parameters of the motor on resonances. The corresponding equivalent circuits for differential mode (DM) and common mode (CM) EMI at resonance frequencies of 500 kHz and 30 MHz are established to determine the EMI propagation paths and analyze the effect of distributed parameters on conducted EMI. The dominant distributed parameters of elements responsible for the appearing resonances at 500 kHz and 30 MHz are determined. The effect of the dominant distributed parameters on conducted EMI are presented and verified by simulation and experiment. The conduced voltage at frequencies from 150 kHz to 108 MHz can be mitigated to below the limit level-3 of CISPR25 by changing the dominant distributed parameters.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

The Effect of Distributed Parameters on Conducted EMI from DC-Fed Motor Drive Systems in Electric Vehicles

et al. 2016

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“…A damping impedance inserted between the motor frame and the system ground is designed to suppress the CM current flowing on the motor side [2,7,8]. An EMI filter is designed to eliminate CM currents from both the heat-sink of the power inverter and the motor frame [9][10][11][12][13][14]. The addition of the EMI filters, though supposed to improve the result, could also induce some degradation due to the generation of new EMI noises in other frequency ranges due to the added capacitance and inductance in filters resonating with elements of the power inverter and increasing the weight and the dimension of the power inverter system in EVs with limited space.…”

Section: Introductionmentioning

confidence: 99%

Mitigation Emission Strategy Based on Resonances from a Power Inverter System in Electric Vehicles

et al. 2016

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Abstract:Large dv/dt and di/dt outputs of power devices in the DC-fed motor power inverter can generate conducted and/or radiated emissions through parasitics that interfere with low voltage electric systems in electric vehicles (EVs) and nearby vehicles. The electromagnetic interference (EMI) filters, ferrite chokes, and shielding added in the product process based on the "black box" approach can reduce the emission levels in a specific frequency range. However, these countermeasures may also introduce an unexpected increase in EMI noises in other frequency ranges due to added capacitances and inductances in filters resonating with elements of the power inverter, and even increase the weight and dimension of the power inverter system in EVs with limited space. In order to predict the interaction between the mitigation techniques and power inverter geometry, an accurate model of the system is needed. A power inverter system was modeled based on series of two-port network measurements to study the impact of EMI generated by power devices on radiated emission of AC cables. Parallel resonances within the circuit can cause peaks in the S21 (transmission coefficient between the phase-node-to-chassis voltage and the center-conductor-to-shield voltage of the AC cable connecting to the motor) and Z11 (input impedance at Port 1 between the Insulated gate bipolar transistor (IGBT) phase node and chassis) at those resonance frequencies and result in enlarged noise voltage peaks at Port 1. The magnitude of S21 between two ports was reduced to decrease the amount of energy coupled from the noise source between the phase node and chassis to the end of the AC cable by lowering the corresponding quality factor. The equivalent circuits were built by analyzing current-following paths at three critical resonance frequencies. Interference voltage peaks can be suppressed by mitigating the resonances. The capacitances and inductances generating the parallel resonances and responsible elements were determined by the calculation through the equivalent circuits. A combination of mitigation strategies including adding common-mode (CM) ferrite chokes through the Y-caps and the AC bus bar was designed to mitigate the resonances at 6 MHz, 11 MHz, and 26 MHz related to the CM conducted emission by IGBT switching and the radiated emission of the AC cable. The values of Z11 decreased respectively by 15 dB at 6 MHz, 0.4 dB at 11 MHz, and 11.5 dB at 26 MHz and the values of S21 decreased respectively by 8.6 dB at 6 MHz, 7 dB at 11 MHz, and 6.3 dB at 26 MHz. An equivalent model of the power inverter system for real-time simulation in time domain was built to validate the mitigation strategy in simulation software PSPICE.

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“…Noise is any electrical signal present in a circuit other than the desired signal. An electromagnetic disturbance is any electromagnetic phenomenon which may degrade the performance of a device, or an equipment, or a system [1]. The electromagnetic disturbance can be in the nature of an electromagnetic noise, or an unwanted signal, or a change in the propagation medium itself.…”

Section: Introductionmentioning

confidence: 99%

Modelling of a Filter using EMI/EMC Considerations

Vinaychowdary¹,

Kumar²

2015

IJCA

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There are so many Filters are available in the nature of communication. The modern communications are purely depends on the diversity of the signals. The signaling systems are fairy major problem with the noise that occurs internally or externally. The standard measuring of electromagnetic pulse problems can reduce the problems of noise in the modern digital systems. The present work is to overcome the problems of noise that occurs internally or externally and malfunctions of the circuit with the measurement of EMI/EMC considerations. In Digital Signal Processing system consists of devices such as Phase Shifters and Power Dividers and Filters as well as Multiplexers which are used to transmit and adjust the amplitude and phase of the electrical signals in such a way is to form desire signal. After forming the desire beams of a system and then malfunctions of the system with the measurement of EMI/EMC consideration and observes the beams without any noise in the Digital signal processing system and compared both performances. By using the stimulation and synthesis can be carried out to Digital Signal processing System. The different standard methods to reduce insertion loss are proposed to measure the noise source impedance to particular systems. The information obtained through the proposed method enables the prediction of EMI filter performance and the design of a suitable filter for a switch mode power supply.

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Analysis of EMI Terminal Modeling of Switched Power Converters

Cited by 114 publications

References 30 publications

The Effect of Distributed Parameters on Conducted EMI from DC-Fed Motor Drive Systems in Electric Vehicles

The Effect of Distributed Parameters on Conducted EMI from DC-Fed Motor Drive Systems in Electric Vehicles

Mitigation Emission Strategy Based on Resonances from a Power Inverter System in Electric Vehicles

Modelling of a Filter using EMI/EMC Considerations

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