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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...
Silicon carbide (SiC) devices are attracting attention as next generation power device because of their high breakdown voltage, low conduction loss, and fast switching speed compared with conventional Silicon (Si) device. SiC power device is expected to be used in electric vehicle and hybrid electric vehicle. The large di/dt and dv/dt in fast switching operation interact with parasitic component in...
This report studies the influence of printed circuit board (PCB) design on voltage overshoot and ringing oscillation in switching operation of gallium nitride gate injection transistor (GaN-GIT) for high-frequency DC-DC converter. The parasitic inductances in the main power loop have been identified based on moment of method (MoM) analysis and frequency characteristics of impedance measured with 2-port...
The fast switching operation of wide-bandgap power semiconductor devices deteriorates the Electromagnetic interference (EMI) noise characteristics of a power converter. The parasitic inductance in a power module is one cause of noise generator. This paper calculates parasitic inductance in a wiring pattern of module with Partial Element Equivalent Circuit (PEEC) method, and evaluates the current distribution...
This report focuses the current distribution in a module identifiedwith magnetic near-field intensity for optimizing layout and packaging design of silicon carbide (SiC) power module. This measurement methodology can visualize the practical current distribution on a wiring pattern in a module and can estimate the effect of snubber capacitor in a DC-link of half-bridge to suppress the voltage overshoot...
Wide-bandgap power devices such as those made from silicon carbide (SiC) and gallium nitride (GaN) realize fast switching and it helps to increase the efficiency of power conversion. This report experimentally compares static and dynamic characteristics of wide-bandgap power switching transistors; SiC MOSFET and cascode GaN transistor, and focuses on their characteristics of electromagnetic interference...
Power conversion equipment is known to generate common-mode conducted disturbance. The authors have studied about common-mode apparent power evaluation, which have magnitude and phase information of the disturbance, for clarifying the generating mechanism of the disturbance. This paper describes the importance of evaluation of active power, a part of apparent power of common-mode conducted disturbance,...
The ringing oscillation in turn-off of diode may induce electromagnetic interference (EMI) noise especially in fast switching operation. This study compares static and dynamic characteristics of a Si PiN diode and three type SiC Schottky barrier diodes, which have comparable voltage and current ratings, and focuses on the influence of diode characteristics on conducted emission of the continuous current...
This paper aimed at modeling EMI noise source of the continuous current mode (CCM) DC-DC converter. To this end, this paper focuses on the reverse recovery phenomenon of Si and SiC diodes which is induced in its turn-off operation. This paper also studies the effect of the input voltage level on the recovery current and on the conducted EMI noise in CCM DC-DC boost converter under periodic steady-state...
Power factor correction (PFC) converters are commonly used at the first stage in single-phase switch-mode AC/DC power converters to improve the input current waveform distortion and achieve high efficiency in energy conversion. The operating condition of MOSFET in a PFC converter changes dynamically and periodically. This paper studies the operating condition and output load dependency of spectrum...
The volume and weight of a power conversion circuit depend considerably on magnetic components. Air-core reactor which can avoid core loss is suitable for power converters operating fast and high-frequency switching of the high voltage and large current. This study presents a compact model for the calculation of winding AC resistance of air-core solenoids, which includes the influence of skin and...
A simple analytical copper loss model for inductor is preferred for the design of low-loss and downsized circuits. Air-core inductors, which can avoid core losses and magnetic saturation, are suitable for power converters and wireless charging systems operating at high switching frequencies. This study derives a model for the calculation of the AC resistance of air-core solenoids, which includes the...
It is important for EMC design of power conversion circuit to model EMI noise source. LECCS (Linear Equivalent Circuit and Current Source) model has been proposed for modeling EMI noise in an LSI (Large Scale Integration) on PCB. This paper studies the noise generating mechanism in a half bridge circuit and noise source modeling with equivalent internal impedance and equivalent internal current source.
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