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This paper explores the optimization and design of a medium voltage, modular power electronics transformer based on industrial 1.7 kV IGBTs. The design of the medium frequency transformer is outlined. The thermal management using a two-phase, air-cooled thermosyphon is described. The overall performance of one cell is detailed from measurements on a full-scale laboratory demonstrator. From the data,...
Critical conduction mode(CRM) Buck power factor correction(PFC) with peak current-controlled of currentmode control, its traditional control is constant on-time control, the switching frequency varies with the input voltage and load variations, and a relatively large frequency range, lead to a large of switching loss. This paper proposes a variable on-time control strategy for a CRM Buck PFC converter...
Multi-resonant converters like the CLLLC topology are known for their outstanding efficiency and high power density. Little information has however been published about the influences of secondary side diode junction capacitances on the output characteristics of the resonant converter. This paper presents a detailed analysis of these influences in the inductive working range and reviews practical...
A decomposed voltage control is proposed to integrate two favorable functions of the 3-ph electric spring (ES) to stabilize the mains voltage and to reduce power imbalance. As compared with its precedent counterpart, the proposed control can expand the usage of the 3-ph ES, simplify the control implementation, and enable the ES to conduct multiple tasks at one time. The decomposition of the 3-ph ES...
Induction heating is an efficient and high performance heating method which already has a significant market penetration and economic impact due to its benefits inherent to contactless energy transfer systems such as quickness, cleanness, and safety. In order to improve the efficiency and performance of modern induction heating systems, this paper presents a multiple-output boost resonant inverter...
Traditional droop-controlled systems assume that the generators are able to provide sufficient power as required. This is however not always true, especially in renewable systems, where the energy sources (e.g., photovoltaic source) may not be able to provide enough power (or even loss of power generation) due to the intermittency. In that case, unbalance in active power generation may occur among...
This paper presents a new cascaded connection of multi-output-port converter for Plug-in Hybrid Electric and On-Board Electric Vehicles, which is suitable for dynamic wireless power transfer energy storage systems such as battery, ultra-capacitor, and load. In order to acquire the system power transfer integration between output ports, the central control stability is analyzed by phase shift function...
This paper introduces a new design methodology for high-frequency resonant dc-dc converters utilizing the recently proposed impedance control network (ICN) converter architecture. This design methodology guarantees zero voltage switching (ZVS) and near zero current switching (ZCS) of all transistors across the entire operating range of the converter. As compared to previous ICN converter design techniques,...
A 25 kW wireless charger design for electric vehicles is presented in this paper. The wireless charger consist of three phase power factor corrector (PFC), three phase resonant inverter, primary and secondary coils with series resonant compensation, and a rectifier. In the proposed design, PFC provides a constant voltage DC Bus and the whole output regulation is done by the resonant inverter. It simplifies...
This paper presents a novel prototype of a time-sharing frequency doubler principle-based current-fed zero current soft-switching (ZCS) high frequency resonant (HF-R) inverter for inductive power transfer (IPT) systems. The newly-proposed ZCS HF-R inverter is suitable for producing a higher frequency resonant current with switching power loss reduction by using a middle-class switching frequency insulated-gate-bipolar-power...
Magnetically coupled resonant (MCR) wireless power transfer (WPT) technology is efficient and practical for mid-range wireless energy transmission. For the design of MCR WPT system, it is necessary to seek optimal transmission performance under different applications. This paper presented an equivalent analytical model for such system to incorporate spatial misalignments between the transmitting coils...
A compact modular switched-capacitor DC/DC converter with exponential voltage gain, high efficiency, light weight, and bidirectional power flow, is proposed in this paper. The proposed converter is suitable for applications in high temperature environments since it does not contain magnetic element nor temperature-sensitive capacitor. With an output voltage that is 2N (N is the cell number) times...
This paper presents a low-input-voltage boost converter for thermoelectric energy harvesting. In environments with 1–2 K thermal difference, such as in the case of a body-wearable application, TEG generates several micro watts and tens of mV to the boost converter. For the low-input-voltage operation, the power consumption of the control circuit of the proposed boost converter is reduced by using...
Increasing the penetration of distributed renewable sources, including photovoltaic (PV) sources, poses technical challenges for grid management. The grid has been optimized over decades to rely upon large centralized power plants with well-established feedback controls, but now non-dispatchable, renewable sources are displacing these controllable generators. By programming autonomous functionality...
This paper introduces an envelope tracking (ET) power supply for 4G cell phone base stations using EPC eGaN® FETs. An analytical loss model is developed for design optimization and verified by a single phase synchronous buck converter using the zero-voltage switching (ZVS) technique. The model is then extended to four phases and is used to design a 60 W ET power supply with 20 MHz large signal bandwidth...
The Dual Active Bridge (DAB) DC-DC converter is one of the most popular circuits for bi-directional applications because of simple structure. However, DAB DC-DC converter has few problems such as the surge voltage and hard switching in specific conditions. These problems are caused by the relationship between the output power and phase difference, which causes device breakdown and deterioration of...
This paper introduces a high power density step-up converter for LED applications, based on a hybrid serial-output (HSO) architecture [1], which is suitable for on-chip implementation. In this system, the output voltage is formed by stacking the output of a switched-capacitor (SC) converter on top of a boost converter output. The high power density SC converter processes around a half of the power...
In this paper, new method for generating motor current references is proposed in motor drive systems with single-phase diode rectifier and small dc-link capacitor in order to reduce the amount of the motor currents. Unlike the conventional large dc-link capacitor, small dc-link capacitor cannot work as an energy buffer. Therefore the motor currents, d and q-axis currents in synchronous reference frame,...
For photovoltaic inverters in islanded microgrids, droop control is a preferable strategy due to its attractive ability in bus voltage regulation and load sharing without additional communication system. However, in islanded microgrids without redundant storages, further realization of power balance between droop controlled PV sources and dynamic loads, which is beneficial to enhance PV sources penetration...
The instantaneous output power of the two-stage single inverter pulsates at twice the output voltage frequency, generating second harmonic current (SHC) in the input dc voltage source and the front-end dc-dc converter. To eliminate the SHC, a second harmonic current compensator (SHCC), whose input current is controlled by the improved one-cycle-control (OCC) proposed in this paper, is applied to compensate...
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