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Multi-megawatt scale isolated DC-DC converters are likely to become increasingly popular as means to interconnect the MVDC grids of different voltage levels. Three-phase dual active bridge DC-DC (3DAB) converters operating with the zero-voltage switching (ZVS) is a promising candidate for the target multi-megawatt application. This paper presents a systematic approach of the design considerations...
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 proposed a new soft-switched non-isolated bidirectional converter for energy storage systems. The hard-switched non-isolated bidirectional converter is improved with additional soft-switch cell incorporated with auxiliary active switches, diodes and passive elements. The main operating characteristics of this topology are to transfer the power flow in both directions from low voltage to...
This paper presents a ZVT(zero-voltage-transition) interleaved synchronous buck converter with passive soft-switching cell to achieve ZVS(zero-voltage-switching) of MOSFET switches. The proposed interleaved buck converter is composed of two synchronous buck converter modules and passive soft-switching cell. The passive soft-switching cell consists of coupled-inductor and DC-link capacitor. All switches...
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...
A novel variable frequency variable duty cycle (VFVD) control scheme using off-line digital control by only sensing the output voltage is proposed. Designed for a 6 kV 40 kHz series resonant DC-DC converter in solid state transformer application, it realizes cycle-by-cycle resonant current limiting and zero voltage switching (ZVS) at any load condition. According to the state plane analysis, with...
An interleaved three-level converter with the new current doubler rectifier is proposed. The main advantages of the proposed converter are zero voltage switching (ZVS) turn-on for all switches, low output ripple current and less voltage stress of the output diodes. Two three-level converters connected in parallel are used to decrease the input current ripple, as well as to reduce the current rating...
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...
This paper proposes a novel zero-voltage-switched multi-resonant DC-DC converter. With the resonance between the resonant inductor and the resonant capacitors paralleled with the main switch and rectifier diode, the proposed converter achieves zero-voltage-switching (ZVS) operation of the semiconductors. The resonance components absorb all parasitic components, including the transformer leakage inductance,...
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...
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...
This paper proposes a novel modular multilevel dual-active-bridge (MMDAB) dc-dc converter for spilt-battery energy storage system (BESS) in medium-voltage dc (MVDC) grid application. The proposed converter can be derived from conventional DAB converter and therefore exhibits favorite characteristics of galvanic isolation, inherent zero-voltage-switching (ZVS) condition and small passive components...
This paper presents a DC/DC converter integrated a full-bridge converter and a half-bridge converter. Compared to the conventional full-bridge converter, the advantages of the proposed converter are low circulating loss, wide ZVS range of the lagging-leg switches and low output inductor size. A resonant capacitor is adopted in the transformer primary side to reduce the primary current to zero during...
This research paper introduces a three-output three-level resonant inverter by using phase-shifted pulse-width modulation (PSPWM) technique for controlling all switches and simple power factor correction (PFC) technique for improving the power factor to be near unity. The proposed circuit can provide three outputs simultaneously. In addition, all switches can operate under the zero-voltage switching...
This work proposes a new application of a DC-DC zero-voltage switching (ZVS) full-bridge converter in a photovoltaic (PV) energy system. On its input is connected a photovoltaic array, mostly parallel connected, resulting in a low voltage input. The control applied to the converter is a peak current-mode control, controlling its input current and performing the maximum power point (MPP) tracking (MPPT)...
According to the Emerge Alliance, the interest for 380Vdc power distribution for data centres is growing. The DC distribution reduces the number of power conversion steps by utilizing a DC voltage of 380V; it provides a significant reduction of cable dimensions and associated costs. Some server board vendors have recently begun to initialize a move from a supply voltage of 12Vdc to 48Vdc. In order...
A new three-level zero voltage switching (ZVS) pulse-width modulation (PWM) converter with the balanced output currents is presented for medium input voltage and high load current applications. Three-level converter with two clamped diodes and one flying capacitor is adopted to reduce the voltage stress of power semiconductors for medium voltage application and achieve ZVS operation for power MOSFETs...
This paper reports experimental zero voltage switching (ZVS) characteristics of the state-of-the-art 12 kV SiC N-IGBTs with 2 μm and 5 μm field-stop buffer layer thicknesses. Extensive results up to 7 kV and 150°C are presented for both IGBTs with and without an external snubber capacitor. The 12 kV SiC IGBTs have been found to have significantly larger magnitude of turn-off current bump in comparison...
A soft switching converter using low voltage and low current stresses of power components is presented for high input voltage and high output current applications. Two input capacitors and four power MOSFETs are adopted at high voltage side in order to reduce the voltage stress of power switches. Thus, the voltage stress of MOSFETs is clamped at Vin/2. Two flying capacitors are adopted at the AC side...
This paper presents a new resonant converter to achieve soft switching on power devices. Two full-bridge converters are connected in series to clamp the voltage stress of power switches at Vin/2. Thus, power MOSFETs with 650V voltage rating can be used for 1300V input voltage applications. Two flying capacitors are connected on the AC side of two full-bridge converters to automatically balance two...
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