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As the distributed generators are connected together through inverter interface in the microgrid, the control of the control of the interface inverter has an important influence on the operating performance of microgrid. In the paper, the study focuses on the control of the interfaced inverter, when microgrid operates in the islanded mode. In order to make the microgrid property similar to the utility...
This paper proposes a new modeling method for buck converter. The new modeling method, named bi-switching status method (BSM), for buck converter is obtained via the propositional calculus and linear constrain. Based on the mixed logical dynamical (MLD) model, BSM model of buck converter is obtained. Compared with other modeling methods, such as MLD method and state-space averaging method, streamlined...
Wireless power transmission via magnetic resonance has been attracted and interested as long range wireless power transmission method. As a consequence, high-frequency inverter operating under high power conversion efficiency is required. In this paper, power conversion efficiency and power transmission efficiency of full bridge inverter using GaN devices are evaluated and discussed from the experimental...
The trend in Intermediate Bus Converter (IBC) is increasing output power demands and higher operating frequencies, while the appearance of GaN devices will improve the power density of the converter possibly. This paper analyzed the high frequency characteristics of GaN devices and its advantages at high frequency applications. Owing to difficulties in designing driver circuit and layout, the paper...
This paper presents an analysis and comparison of magnetics structures in a tapped boost converter for LED applications. The magnetic structure is a coupled inductor which is analyzed in a conventional wire-wound core as well as in a planar structure for different interleaving winding arrangements. The analysis is performed in terms of leakage inductance, winding capacitance and winding loss. Efficiency...
Conventional Wireless Power Transfer (WPT) has limitation due to the contradiction between the power transfer efficiency (PTE) and power transmission distance. A novel network called Wireless Power Transfer Network (WPTN) is proposed to help overcome the limitation, and power is efficiently transferred from a transfer node to a receive node via relay nodes over a relatively long transmission distance...
The wireless power transfer (WPT) system for electric vehicles requires high efficiency, lightweight, compact and be suited to big air gap. The WPT system has low coupling coefficient, which is far different from the traditional transformer. Optimal parameters design approach for resonant converter with S-S compensation for WPT is investigated. 85kHz and 20kHz parameters design are introduced in the...
In modern smart electric grids, power cables are supervised by a large number of monitor equipments. In many field application cases, current transformers (CT) are employed to extract electrical power from these high voltage cables to supply monitoring circuits. In this paper, in order to harvest maximum power from cables, key parameters of the rectifier with current transformer circuits are analyzed,...
The Switched Z-source Isolated Bidirectional DC-DC Converter (SZIBDC) is a novel topology that inherits the advantages of Dual Active Bridge (DAB) while overcoming its disadvantages. This paper presents the small-signal model of open-loop SZIBDC firstly. After that, five kinds of close-loop control strategies based on PI-regulator or Fuzzy Logic Controller (FLC) are theoretically analyzed and validated...
Vibrational energy harvesting is gaining more and more attentions recently due to increasing power demands for on-board and remote applications. Piezoelectric Zirconate Titanate (PZT) based cantilever structure is one of the popular forms for vibrational energy harvesting. However, due to its complex electromechanical characteristics, the energy harvesting still remains as a challenge. This paper...
In inductive Power Transfer (IPT) application, minimum supply VA rating and convertor conduction loss are two important design purposes. The LCL resonant convertor can achieve both of these objects when designed appropriately. In this paper, the LCL resonant tank is changed into two LC resonant networks, then the unity power factor compensation parameter which can minimum supply VA rating and current...
The Gallium Nitride (GaN) devices have been attractive due to its low loss and high switching speed. With the soft switching, for example critical mode operation, the GaN converter can be further pushed over MHz range. How to design the critical mode inductor at such switching frequency is a challenge, because the loss on the inductor is a big concern for the converter efficiency. This paper experimentally...
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