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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...
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...
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...
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...
This paper presents a complete design procedure for a motor drive aiming at maximizing nominal power within loss (30 W) and form factor (60 inch3) constraints. Particularly, this motor drive system has EMI requirement on both input and output sides and it should be free convection cooled. Loss-size Pareto fronts of multiple three-phase topologies including two-level voltage source converter (VSC),...
This paper discusses the issues related to the common-mode electromagnetic interference (EMI) noise generated by a single-phase AC/DC power converter with no AC utility line grounding connection. We find that the common-mode EMI noise still exists even when a common-mode LC filter is connected between the ground and AC input terminal. This paper presents a new common-mode EMI noise-reduction method...
This paper presents the modeling and design of a source-buffered Miller operational amplifier structure that is highly immune to electromagnetic interference (EMI). The source-buffered Miller operational amplifier is designed and fabricated in the 0.18 μm mixed-mode CMOS process and modeled mathematically including the body effect and channel length modulation. Measurement results show that the maximum...
Power electronic components such as busbars, capacitors, and inductors are positioned close to each other when designing a high power density converter. Therefore, the internal near field couplings between these components should be considered when designing a low electromagnetic interference (EMI) converter. In this paper, we propose a new frequency domain model for simulation of EMI in power electronic...
A novel algorithm for the iterative geometric optimization of EMI filters is presented. The two step approach of an equivalent electric circuit extraction, followed by a sensitivity analysis in the circuit as well as the 3D model domain drives the shape optimization. This allows for a deeper insight into coupling paths and their cause in the model, and their effect in the circuit domain. The concept...
PFC converters are widely used in industrial drive systems. The modulation scheme and the topology of the converter have a considerable impact not only on the switching losses, but also on the volume of the passive components, i.e. the EMI filter (CM and DM) and the dC link capacitors. In order to evaluate this impact, different modulation schemes for 2L and 3L topologies are analysed in this paper...
A new ultra-low inductive 600 V / 200 A half-bridge power module, called LinkPack module, with integrated DC-link capacitors and common mode EMI shielding was realised. LinkPack module contains intentionally SiC-Mosfets, however it is also possible to equip Si-IGBTs and Si-diodes respectively SiC-diodes. This allows the realisation of full SiC-Mosfets modules, hybrid SiC modules and Si-IGBT / Si-diodes...
This paper analyzes the effects of transformer inter-winding current on the common mode (CM) electromagnetic interference (EMI) in a full-bridge LLC converter. According to the distribution of inter-winding capacitances and the voltage variations across windings of a single resonant inductor LLC full bridge converter, the CM current is reduced significantly by separating the resonant inductor and...
The main function of the DC-link decoupling capacitors, integrated between the voltage source and the power devices, is to suppress the effect of the parasitic inductors and minimize the voltage overshoot. Besides, decoupling capacitors can also affect the electromagnetic interference frequency spectra. In this paper, the elïects of decoupling capacitors are explained from the time-domain and the...
In previous work, the authors proposed an active common-mode filter (ACF) that is able to reduce the radiated noise from power cables connected to power converters and evaluated its radiated noise reduction effect by using an oscillator as a common-mode (CM) noise source. In this paper, this ACF is applied to a motor drive system fed by a PWM inverter, and the attenuation characteristics of the CM...
This paper studies the conducted electromagnetic interference (EMI) problems in a DC/DC switched-mode power supply (SMPS) with semi-isolated topology. A high frequency circuit simulation model is firstly established to predict the conducted emissions of this power supply. Then the common mode (CM) and the differential mode (DM) conducted emission mechanisms of this power supply are analyzed in detail...
DC power systems increase the flexibility and efficiency of electrical power networks by eliminating unnecessary conversion stages. However, loads interconnected to the network through a power electronics converter exhibit nonlinear behavior which can lead to stability problems. In this paper, Sum of Squares (SOS) programming methods are utilized to compute stability metrics for dc networks. While...
In recent years, photovoltaic (PV) systems have been widely used for power generation and renewable energy. However, a lot of electromagnetic interferences (EMI), which will influence the normal performance and operation of other electrical devices, have been generated seriously by the PV converter, especially the conducted EMI noises from 9kHz to 30MHz. To mitigate the conducted EMI noises, the topology...
Two on-chip electromagnetic compatibility (EMC) solutions realized in the standard 0.18 μm CMOS technology are proposed. A slew rate controller for electromagnetic interference (EMI) reduction is demonstrated by increasing the rise and fall time of signal to lower the harmonic energy on FFT spectrum. Besides, a MOS plus MOM decoupling capacitor for both EMI and electromagnetic susceptibility (EMS)...
Power efficient Class-D audio amplifiers are very popular in mobile applications, despite the potential electromagnetic interference (EMI) caused by their output stage. Going to higher power levels, more effort has to be put into the reduction of EMI without sacrificing audio performance and efficiency. This work presents a Class-D output stage with an adaptive driver concept. The proposed driver...
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