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The ring core inductors are widely used in EMI filters to reduce the conducted emissions induced by the power converters. However, the high frequency behavior of these inductors is modified by the apparition of the stray capacitances. These elements have more influence on the efficiency of the EMI filters. In this paper, three modeling methods based on the finite elements method are proposed to calculate...
The high frequency high voltage (HFHV) transformer is one of the biggest contributors for conducted electromagnetic interference (EMI) emission of switching power supply. The transformer technologies for reducing conducted EMI emission focus on the shielding and changing the winding structures. However, for suppressing conducted EMI, the suppression capability of shielding is limited; current methods...
This paper proposes a new solution to balanced inverter to achieve near zero common-mode voltage generation for a three-phase inverter. The neutral-point diode-clamping solves the issue of desynchronization of the balanced inverter. As the switching frequency of PWM inverter can be increased with the advances in power semiconductor technology, the common-mode voltage related issues in motor drives,...
The use of wide-bandgap (WBG) devices in power converters provides several advantages in terms of efficiency, power density and low cooling requirements. However, a potential unwanted side-effect is the increased electromagnetic interference (EMI) noise, the basis of which is the high di/dt and dv/dt realized by the characteristic sharp rise and fall switching offered by the WBG power switches. To...
A design methodology is presented for a full-bridge Power Factor Corrector (PFC) converter with two control schemes: the well-known Continuous Current Mode (C.C.M) and Triangular Current Mode (T.C.M). The second one is an extension of the Discontinuous Current Mode (D.C.M). The converter is composed of one high frequency leg and one leg switching at the grid frequency and includes the EMC (common...
This paper first developed magnetic reluctance models for magnetic inductors. The near magnetic field emission of the inductors with different winding and air gap configurations are analyzed based on the developed models. Several inductor structures are proposed to reduce the near magnetic field emission. Simulation and experiments are conducted to validate the developed techniques.
Due to the introduction of wide bandgap (WBG) devices such as silicon carbide and gallium nitride devices, the power inverters with ultra-low loss, high temperature, and compact size are made possible for various applications. However, the increased dv/dt and switching frequency of WBG devices also aggravate the common-mode (CM) voltage related issues of the PWM inverter based systems. In the past...
This paper proposes a novel type of an active common noise canceler (ACC) combining feedforward and feedback control. The ACC attenuates the common-mode (CM) voltage and suppresses EMI emissions by adding the CM voltage of reverse polarity to the CM voltage generated by inverters in AC motor drive system. The proposed ACC uses feedforward and feedback control whereas the original ACC [19] uses feedforward...
The paper investigates the near magnetic field performance of integrated CM and DM inductors. The reluctance model is developed for near magnetic field analysis. Based on the analysis, several integrated inductor structures using commercial EE/EI cores to achieve low near magnetic field emission are proposed. Simulations and experiments were conducted to verify the proposed inductor structures.
An electromagnetic interference (EMI) filter design method for electric vehicle (EV) application is proposed in this paper. By transforming the design problem to an optimization problem, the filter volume, system disturbance level, inverter touch current and filter leakage current are taken into account simultaneously. A topology and order evolution approach is merged into the optimization algorithm...
An inverter prototype, 2.9 L in size, for driving an 80-kW motor was fabricated, and its common mode current was reduced by up to 15 dB compared with that of a basic inverter. In this paper, the two main features of the electromagnetic interference (EMI) reduction structure are described. The first feature is that the P and N bus bars of the inverter prototype are designed to avoid a differential...
EMI filters are widely used in power electronics converters to meet EMI standards. Since the common-mode inductor is often the largest single magnetic component, it must be optimized for size and cost. This paper investigates and presents datasheet and experimental comparisons of the magnetic materials aimed for a common-mode choke design. Several magnetic materials are considered: amorphous iron,...
For suppressing of the conducted electromagnetic interference (EMI), passive EMI filter (PEF) is the most widely applied technique at present. The near-field coupling due to PEF passive components layout has great influence on filtering performance. Currently, the layout of PEF components completely dependents on the experience of EMC engineer. However, there is a lack in systematic design method...
Ferrite chokes are often applied to suppress electromagnetic interference (EMI) in power converters. In this paper, an improved ferrite choke RLC model and its parameters determination method are proposed. The improved ferrite choke RLC model can overcome the limitation of the existing RLC model in the low frequency band, and the proposed parameters determination method can calculate the values of...
In this paper multiple feedback(FB) active filter configurations for DM EMI noise in the input side of AC/DC converters has been analyzed using developed models and then their performance was compared over single FB active filters using measurements. First, a single FB active filter circuit model is developed in the open loop and then based on DM EMI noise model of AC/DC converters, a closed loop...
Silicon carbide (SiC) MOSFETs benefiting from the wide bandgap materials offer a significant performance improvement compared with Silicon devices. However, the high switching speed makes the power switching to be a source of EMI. The suppression of the EMI generation can be achieved by shaping the switching transient to an “S-shape”. The active voltage control (AVC) strategy is a feasible method...
This paper introduces a paralleled three-phase four-leg inverters and the corresponding pulse width modulation (PWM) method for the purpose of reduction the common mode current (CMC) and common mode electromagnetic interference (EMI). Considering the control principle of three-phase four-leg to limit the common mode voltage and the characteristic of paralleled inverters, the simple PWM scheme for...
This paper proposes a numerical method to calculate the induced potential and current in pipelines installed near a horizontal grounding electrode subjected to lightning discharge using the transmission line approach. The effect of this induced potential on the pipeline metal corrosion has been highlighted in term of mass loss for different soil resistivities and separation distances between pipeline...
This paper presents an analysis for the electromagnetic interference (EMI) related common-mode (CM) noise in differential high-speed data links with different signal modulation schemes, e.g. non-return-to-zero (NRZ) and 4-level pulse amplitude modulation (PAM-4). The CM noises, introduced by the mismatch of data rising and falling edges in both cases, exhibit the similar positive correlation with...
In this paper, the low voltage and high current driver is used as an example to analyze and suppress the EMC problem caused by DC / DC power conversion. In the process of low-voltage and high-current driver design, the problem of misalignment of the drive signal occurs. The paper analyzes the mechanism of the electromagnetic interference in the switch process, and then detects the electromagnetic...
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