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In this paper, a new SPICE-compatible behavioral model and corresponding parameter extraction procedure for single- and three-phase chokes are presented. The model takes into account common-mode and differential-mode behavior of the choke and can be applied to modeling both common-mode chokes and coupled DC chokes. The model parameters are obtained from a straightforward parameter extraction procedure...
This paper presents an intensive discussion on conducted electromagnetic interference (EMI) emissions from an inverter-driven air conditioner. The common-mode voltages produced by the pulse-width-modulation (PWM) inverter may cause a high-frequency leakage current. The use of a spectrum analyzer and a line-impedance stabilization network (LISN) makes it possible to refer the leakage current in the...
This paper proposes a new output voltage control for inverter system which contains time-delay and nonlinear load. In the next generation X-ray CT system with the contactless power transfer method, the feedback signal often contains some long delay time by AD/DA conversion and error detection/correction time. When the PID controller of inverter system has the harmful influence on the time-delay, it...
In this paper, a sinusoidal current charger (Sin-CC) with optimal frequency tracker is proposed for Li-ion battery. The proposed optimal frequency tracker is mainly constructed by the phase-lock-loop so that the features of detecting, tracking and locking in the optimal charging frequency can be achieved. The experimental results show that the charging speed charging efficiency and increasing surface...
Since a die-attach layer has significant impact on the thermal performance of a power module, its quality can be characterized using thermal performance. In this paper, a measurement system for thermal impedance is developed to evaluate three die-attach materials. Thanks to its high temperature sensitivity (10 mV/°C), the gate-emitter voltage of an IGBT is used as the temperature-sensitive parameter...
Smart grids offer a wide application domain for power electronics. In fact, every distributed energy resource (DER) includes an electronic power processor (Switching Power Interface, SPI) which controls the currents drawn from the grid and can be driven to optimize the power flow, improve voltage stability and increase distribution efficiency. For these aims, such distributed SPIs must perform cooperatively...
In this paper, a series resonant converter (SRC) using a piezoelectric transducer for low profile application is proposed. The proposed circuit allows integration of the power circuit by eliminating conventional bulky magnetic components. Effects of the material constants such as electromechanical coupling coefficient and mechanical quality factor on the converter performance are discussed. Design...
Large-scale harvesting of solar energy is an important action to decelerate the observed climate changes and ensuring the availability of energy also in the future. It has been observed that the maximum-power-point (MPP) tracking converters have high contribution on the reliability problems in the photovoltaic energy systems because of misunderstanding of their real nature. The paper shows that most...
This paper describes a damping control method of power converters for suppression of the resonance in DC power networks. The resonance investigated in this paper is caused by the impedance of the DC distribution line and the DC line capacitors of the power converters. For detailed investigation, a combined system of a PWM rectifier and a PWM inverter is treated as a simplest example. To suppress the...
Z-source energy conversion is a recent concept introduced for adding voltage-boost functionality to the otherwise buck-only dc-ac inverter. The same concept can equally be extended to other converter topologies including the indirect ac-ac matrix converter, where only a single Z-source impedance network needs to be inserted to its intermediate dc-link. Because of such a simple insertion, topological...
In a vehicle, radiational noise generated by the common-mode current in an inverter system is the cause of electromagnetic problems of in-vehicle radio antennas. This paper proposes a new method ”Z-matched ACC” for suppressing the common-mode current at AM band. With this method, the freewheel current, which reduces the common-mode current suppression effect at AM band in conventional voltage-cancellation...
Instead of just transforming energy, a modern power converter should incorporate enhanced features to adapt its behavior to its environment. Stability issues in 3-phase power systems with PFC rectifiers incorporating input filters have been a problem for a long time. In this paper a new concept is presented as to how the power converter can shift filter resonances into an unproblematic frequency range...
In a grid-connected PV system using a QZSI(Quasi Z-Source Inverter), the capacitor voltage of an impedance network is controlled to be constant to track the MPP(Maximum Power Point) of a PV array and generate the reference output current. For higher efficiency of the system, if possible, the reference voltage of the capacitor should be set at a lower value. On the other hand, the reference voltage...
Accurate extraction of the parasitic parameters on a printed circuit board (PCB) and establishment of a new design method for high-power density by considering the parasitic components will become major technological issues to increase the power density of converters. This study focuses on the time domain reflectometry (TDR) technique for the effective measurement of parasitic parameters on PCBs with...
Inter-harmonics currents cause parallel resonance between line impedance and passive filter, which puts the hybrid parallel power filter operating in dangerous condition. A novel feed-forward control method is proposed to suppress the resonance by detecting resonant frequency current in load current. The feed-forward control coefficient is independent with resonant frequency, which simplifies the...
Power electronics technology is becoming an increasingly important aspect of today's power distribution system. It is the key interface to connect distributed energy resource (DER) to the utility and the local loads. With the increased penetration of power electronics based distributed generation (DG) systems, the power quality requirements are becoming more stringent. On the other hand, if controlled...
Communication lines in wire communication systems are usually used as power lines. Ac communication signal and dc supply power are separated at input part of a powered terminal. Conventional well-known separators utilize the combination of inductors and capacitors. When the frequency of the signal is low, the inductance increases, making it necessary to have a large inductor. A conventional electronic...
In this paper, through deduction and simplification, output impedance of each module and total output impedance of paralleled system with active current sharing control in paralleled operation are derived by measuring the output impedance of each module working standalone with particular connection ways of current sharing bus and calculation. The proposed output impedance derivation method can be...
This paper proposes a general device-based common mode (CM) model for inverter-fed motor system that able to describe the CM conducted electromagnetic interference (EMI) propagating mechanism in the system. Numerical parameters are derived using impedance measurements. The procedure of model elements extraction is introduced systematically and is convenient to implement. The derived model makes the...
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