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W artykule przedstawiono wyniki pomiaru poziomu szumów środowiskowych przewodzonych na liniach zasilania sieci energetycznej niskiego napięcia w zakresie częstotliwości od 0.15 MHz do 30 MHz. Podano zależności do wyznaczania wartości poziomu szumów środowiskowych na liniach zasilania. W artykule przedstawiono schemat blokowy zestawu do pomiaru poziomu napięcia szumów środowiskowych.
W artykule przedstawiono metodykę pomiaru poziomu szumów środowiskowych przewodzonych na liniach zasilania sieci energetycznej niskiego napięcia w zakresie częstotliwości od 0.15 MHz do 30 MHz. W artykule przedstawiono schemat blokowy zestawu do pomiaru poziomu napięcia szumów środowiskowych, jego ukompletowanie oraz opisano metodologię pomiaru. Przedstawiono przykładowe wyniki pomiarów. Podano zależności...
In power electronics applications, high frequency models for cables are necessary to understand EMI issues in pulsewidth modulation drives. This paper shows the approach developed at the French Institute of Technology (IRT) Saint-Exupery, in order to take account of the frequency dependency of unshielded power cables per-unit-length parameters for EMC simulations. Fast, predictive models are compared...
The study presented in this paper shows how the conduction modes of a three-phase diode rectifier affect the distribution of noise in an ac-fed three-phase motor-drive system. It is found that in all of the conduction modes, the commonly used noise separation equations will not result in a clean separation of the common-mode (CM) and the differential-mode (DM) noise. This paper shows the intricacies...
This paper presents a specific conducted electromagnetic interference (EMI) model for power electronics converters combining both common mode and differential mode emissions. This model allows the estimation of the conducted emissions solely based on the semi-conductors' switching functions. It offers the possibility to chain models in order to emulate the conducted EMI behavior of a global power...
Power converters will only be effectively used in future aircrafts if they are compact, efficient and reliable. All these aspects can be improved by the use of disruptive technology such as the so-called Wide Bandgap (WBG) semiconductors made of Silicon Carbide (SiC) or Gallium Nitride (GaN). These components can switch much faster than their silicon counterpart, which can reduce converter losses...
Passive EMI filters occupy significant volume in a power converter. This work involves the study of utilizing Active EMI Filters (AEF) and Hybrid EMI Filters (HEF) to reduce the volume of passive filters. The DUT under consideration is a 30 W AC-DC converter. Since the power level less than 65 W it does not have a PFC stage. In this work, noise sensing is carried out using voltage sensing methodology...
In this paper the conducted emissions generated by an inductive power transfer (IPT) system composed of an array of magnetically coupled stranded-wire resonators and powered by an H-bridge inverter (operating at a resonant frequency of 147kHz) are assessed for arrays with different numbers of resonators, different termination impedances and for a constant power of 5W absorbed by the termination impedance...
Configurations, such as the physical layout of the measurement setup and operation conditions of equipment under test (EUT) especially the complexity of the displayed image for conducted emission measurements specified in CISPR 32[1] differ from those in CISPR 13 [2]. CISPR 32 requires a typical system configuration but CISPR 13 does not require the system. After CISPR 32 was published, multimedia...
DC Motors are important components for the automotive industry, but they're also a strong electromagnetic interference (EMI) source. Knowing this problem, conducted emission (CE) tests and Voltage Transient Emissions (VTE) tests were carried out along the power lines of the motor according to the standards CISPR 25 and 7637-2. Conducted emissions from the components which are to be placed on an automotive...
This paper analyzes how the switching noise generated in the power section of common three leg inverters used to drive BLDC motor gives rise to common mode conducted emissions. Besides the identification of the primary sources of switching noise and the parasitic elements that usually play a key role in the propagation of such disturbances, a new method based on a tight control of the power MOS commutation...
In this paper a high frequency model of the Electrical Nacelle Anti-Ice (ENAI) system is described for a typical aircraft application. The ENAI system, usually modelled only at the normal operating frequency, is modified in order to include a detailed high frequency description, which is of interest for conducted emission studies. Using this enhanced model it is possible to predict the conducted emissions...
This paper proposes a frequency domain model to predict conducted electromagnetic interferences (EMI) caused by a converter. In the model, the nonlinear and time-variant semiconductor switches of the converter are replaced by voltage sources characterized by measurements during operation of the converter. A vector network analyzer (VNA) measurement method is presented to characterize the disturbance...
A simple low-cost active EMI filter (AEF) without transformers is proposed. The equivalent circuit model of the proposed AEF is built, and a block diagram is extracted for efficient feedback analysis. The feedback loop gain and the performance of the AEF are calculated and validated by comparison with SPICE simulations. The proposed AEF enlarges the effective value of Y-capacitors. The AEF is manufactured...
A terminal model is a common method to create equivalent models of boost converters in order to predict conducted emissions. In this paper, a characterization board was designed to measure the voltages across and currents flowing into the input side of a DC-DC boost converter automatically by changing the load conditions using the relays as switches. After the equivalent source was determined, the...
Since some years, one solution to increase the power density of the power converters consists to use the wide band gap semiconductors like SiC and GaN. These devices allow having power converters that operating with the high switching frequencies. These fast devices induce of very high variations of the voltage (dv/dt) and current (di/dt) during commutations. The direct consequence is the generation...
In this paper the temperature impact on conducted emissions of ICs up to 3 GHz has been analyzed. The electromagnetic conducted emissions of a commercial IC clock generator have been characterized and modeled from 293 K to 358 K. A temperature parametrized lumped‐electrical equivalent model including the PCB and IC behavior has been developed and validated by means of Feature Selective Validation...
A new international standard proposal (IEC 62433-2 Edition 2.0) is in progress. The main purpose of the standard is to provide an Integrated Circuit Emission Model - Conducted Emission (ICEM-CE) along with a data exchange format. It is known that the existing ICEM-CE information is closely linked to the supplier of the model or simulation software used to generate the model information, rendering...
In power electronics, the layout of a converter is known to have a significant impact on its conducted emissions. This paper focuses on layout modelling in order to predict converter compliance with EMC standards before prototype manufacturing. Inductive effects and capacitive parasitic effects should be considered and models in the form of equivalent circuits are required by time domain simulators...
This contribution presents results from an investigation into conducted emissions of an automotive inverter in a component level EMC test setup with unshielded cables. The primary goal of the investigation is to develop a profound understanding of the shape of the disturbance voltage's frequency spectrum at the line impedance stabilization network. Complying with that objective, common-mode currents...
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