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This paper analyzes the behavior of a pure capacitive output filter in parallel and series-parallel resonant converters. Unlike traditional resonant voltage-and current-driven rectifiers, pure capacitive output filters present interruptions in power transfer from the transformer primary to the secondary, owing to the existence of a parallel resonant capacitor. Therefore, existing formulas for different...
Nine-switch converter is a recently proposed reduced-switch equivalence of the twelve-switch back-to-back converter. The usual expectation is thus for the nine-switch converter to face some switching constraints and hence performance tradeoffs. However, this might not always be the case with an answer only available after performing a thorough analysis. For that, it is the intention now to compare...
The small-signal modeling of dual active bridge (DAB) converter dynamics in discrete time is a useful analysis tool due to the ability to incorporate behavior during zero-voltage switching (ZVS) intervals explicitly, and is advantageous for the direct design of digital compensators. While the control-to-output transfer function has been modeled previously, accurate models of the output impedance of...
GaN HEMT devices exhibit improved performance in terms of switching speed and reduced on-state resistance, especially if low-voltage and high-frequency conditions are considered. In this paper, a high-power density quasi-resonant converter is proposed in order to improve both the maximum output power and the maximum operating frequency with GaN HEMT devices. Since the proposed converter operates as...
The input current of single-phase inverter typically has an AC ripple component at twice the output frequency. The low-frequency current ripple can cause a reduction in both the operating lifetime of its DC source and the energy conversion efficiency of the system. In this paper1, a proposed waveform control method which can eliminate such a ripple current in boost inverter system, is discussed. The...
A bidirectional secondary LLC resonant converter with auxiliary switches and an additional inductor is proposed to achieve the high gain characteristics of LLC resonant convertors. Auxiliary switches, an additional inductor and a resonant capacitor are connected in the high voltage secondary side of the proposed converter. The ac analysis and operating characteristics of bidirectional secondary LLC...
This paper proposes the simple and seamless operation technique for bi-directional LLC converter. Generally, bi-directional operation of LLC converter is complicated and difficult to control. Because, the switching frequency has to be changed across fsr (series resonant frequency) and the switching sequences has to be also changed due to resonant characteristics. In order to simplify the switching...
Time-shift control (TSC) is a novel control technique for resonant converters that outperforms the traditional direct frequency control (DFC) method implemented in all of the currently available control ICs. In particular, TSC makes the dynamic behavior of LLC resonant converters closely resembling that of a first-order system. Thus, closing the control loop to meet stability and even demanding dynamic...
A two-stage single-phase grid-connected inverter has 120Hz component in input current as influence of pulsating output power at double of the grid frequency. The 120Hz component of input current has to be reduced or eliminated because low frequency current can damage a source or reduce efficiency in the photovoltaic, fuel cell and battery systems. Prior studies which deal with reduction of the 120Hz...
Current trends in power distribution systems, such as telecommunications, computers, transportation and utility grid applications, are focused on distributed architectures instead of centralized approach. Distributed architectures are more complex since a network of power electronics converters is required to distribute power with appropriate performance. Hence, new challenges regarding integration...
This paper describes the detailed design of a singlephase multi-level single-phase shunt current injection converter based on cascaded H-bridge topology. The shunt current injection converter can inject an arbitrary current perturbation at three-phase power system interfaces, in order to identify small-signal dq impedances. Special attention is given toward the selection of inductors and capacitors,...
Based on Extended Describing Functions technique, small-signal modeling technique is applied to Series-Series compensated Induction Power Transfer (IPT) system. The derived model includes both frequency control and phase shift control. The derived model is in good agreement with the simulation results obtained from Simplis software.
A novel converter configuration that allows for high frequency transformer integration and high voltage distribution is proposed for large scale grid-connected photovoltaic (PV) system. The proposed configuration has in the front-end of the solar panel, dual-active bridge dc-dc converter with three-level neutral-point clamped secondary and a high-step-up ratio high frequency transformer. The output...
This paper is focused on a new converter topology with medium frequency transformer isolation for medium voltage (MV) wind turbine generator (WTG) power systems. The approach is a high density power conversion, with simultaneous high performance features suitable for next generation wind power systems for both on-shore and off-shore applications. The proposed topology employs 1-phase multi-level AC-AC...
In this paper, a medium-voltage (MV) data center power distribution system (DC-PDS) architecture using medium-frequency (MF) link transformer isolation is introduced. The proposed approach significantly improves power density while maintaining high efficiency compared to conventional line-frequency based solutions. The approach also contributes to a reduction in PVC or copper used in conventional...
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