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Performance analysis and output voltage regulation of a cascaded step-up switched-capacitor converter (SCC) under zero voltage switching (ZVS) condition is analyzed in this paper. The ZVS condition (converter operation above its resonant frequency) provides 1) zero-voltage switching, which leads to a relatively higher efficiency compared to zero current switching (ZCS) under the resonant frequency...
Improving the power density of a power converter has many benefits for systems integration. Aspects such as thermal management, weight, conformation to mounting locations, and the footprint of the converter all become critical factors as systems continue to scale down in size. The flying-capacitor multilevel (FCML) converter topology is of interest because it has characteristics which contribute to...
This paper introduces a 97% efficiency medium voltage (MV) Solid State Transformer (SST) based on two-level single stage (TLSS) topology and 15 kV SiC MOSFETs. Series resonant converter (SRC) is implemented as the main stage and is identified as a current source (CS) SRC for the first time. Equivalent resonant frequency of the proposed CS-SRC is analyzed in both time domain and frequency domain. Resonant...
This paper introduces a new two-phase interleaved flying-capacitor LLC converter topology with high output current applications. Compared to a conventional two-phase LLC converter, the new converter adds a single capacitor that contributes to lower voltage stress on the primary side's switches, automatically balances the current distribution between the phases and enhances the power processing capabilities...
This paper proposes a novel integrated power system for electric vehicles (EVs) to improve the power density and efficiency at a less cost. It integrates the on-board charger (OBC) and the low-voltage DC/DC converter (LDC) by common use of semiconductor devices, capacitors and magnetic components. Therefore, the volume and cost of the integrated system is reduced compared with the conventional two...
This paper proposed a novel eight-output LED driver which contains a two-output isolated dc-dc converter and two passive current balance circuits connected with outputs of the converter respectively. By controlling switches, the value of output voltage and the number of output channel are determined; therefore the illumination is adjustable, which makes the topology suitable for applications such...
This paper proposes a switched capacitor based non-isolated zero voltage switching (ZVS) bi-directional dc-dc converter. By implementing a switched capacitor loop, it can provide high step up and step down gain. The converter is operated in continuous current mode (CCM) mode where all the power transistors are soft switched by means of dedicated auxiliary resonant networks. Each network consists of...
In-dependency from fossil fuel to reduce pollution level has become a zenith issue in the field of power generation. Renewable energy sources have become a potential replacement of traditional generation. However the output voltage from the renewable energy sources like photovoltaic cells is low and is not sufficient for the integration to the utility grid. Many high gain DC-DC topologies have been...
A three-phase dual active bridge (DAB) converter with three-level phase-legs is analyzed, showing an increased soft-switching region and a reduction in rms current in the ac-link for unequal input and output voltages compared to the conventional two-level circuit. Furthermore, a comparison of the semiconductor losses is carried out for different three-level inverter implementations using commercially...
The paper presents a low-loss auxiliary circuit in a power factor correction (PFC) circuit to achieve zero voltage transition and hence improving the efficiency and operating frequency. The high dynamic energy generated in the switching node during turn-on is diverted by providing a parallel path through an auxiliary inductor and a transistor placed across the main inductor. The auxiliary devices...
This paper presents a new topology for a fully bidirectional soft-switching solid state transformer (S4T). The minimal topology, featuring 12 main devices and a high-frequency transformer, does not use an intermediate DC voltage link, and provides sinusoidal input and output voltages. The S4T can be configured to interface with two-or multi-terminal DC, single-or multi-phase AC systems. An auxiliary...
This paper presents a stacked-topology resonant switched-capacitor (ResSC) dc-dc converter to achieve a high voltage conversion ratio. The topology can be generalized to any N-to-1 dc-dc conversion application with only a single inductor. Multiphase interleaving can be further employed to improve the ripple cancellation and reduce requirement for bypass capacitors. To enable a wide output range while...
This paper presents a new single-stage utility frequency ac (UFAC)-high frequency ac(HFAC) resonant power converter for high frequency induction heating(IH) applications. The newly-proposed ac-ac converter features a boost converter and full-bridge HF resonant inverter integrated circuit (Boost-Full-Bridge BFB) with a source voltage sensorless control scheme. The experimental results of a 3.0kW–40kHz...
This paper presents the analysis of various topologies of Resonant Bidirectional DC-DC converters for renewable energy source (solar) and energy storage system by simulation. In this paper, the bi-directional DC-DC conversions are analysed and automatic transition is achieved by the new proposed LLC Resonant Bidirectional DC-DC converter. The directions of power flow and output power can be changed...
Gallium Nitride (GaN) HFETS are an enabling technology for high-density converter design. This paper proposes a three-level dc-dc converter with dual outputs based on enhancement-mode GaN devices, intended for use as a battery charger in aircraft applications. The charger can output either 28 V or 270 V, selected with a jumper, which meets the two most common dc bus voltages in airplanes. It operates...
The analysis, modeling and control of an interleaved boost series resonant converter (IBSRC) is presented in this paper. The converter consists of an interleaved boost stage, a high-frequency transformer (HF-XFMR) and a voltage doubler rectifier. The HF-XFMR's leakage inductance and the voltage doubler bridge rectifier's capacitors form a resonant tank that allows zero-voltage switching (ZVS) of the...
A high efficiency, low profile and high step-up dc-dc converter is proposed for low dc voltage renewable energy system. Generally, the power source such as photovoltaic array and the fuel cell stack have low voltage output because of that a high voltage step-up converter is required to boost the voltage much higher than the voltage level for front-end application. The efficiency and voltage gain of...
In quest of higher efficiency and power density, various studies have been carried out to boost the performance of conventional asymmetrical half bridge (AHB) topologies through either magnetics optimization or deployments of fully soft switching schemes. Although the reporting results from existing works are quite promising, none of them show significant breakthrough in power conversion density which...
This paper presents a new capacitively-aided zero voltage switching (ZVS) technique for isolated bus converters. The proposed technique helps to achieve ZVS conditions for both inverter and rectifier switches with the aid of magnetizing current of the transformer and capacitors interconnecting primary and secondary side switching nodes. With the proposed topology, the ZVS conditions for inverter and...
This paper introduces a new topology and the associated control method of an isolated, high-frequency ac link inverter for photovoltaic applications. The circuit, which uses a buck-boost interface on the dc side and a half-bridge cycloconverter on the ac side, works on the principle of controlling the amount of charge delivered to the output over a switching period. The proposed circuit has advantages...
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