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This paper presents an interleaved totem-pole bridgeless power factor correction (PFC) rectifier which consists of a coupled inductor and two interleaved bridge arms. The core utilization and power density are improved with the use of coupled inductor. However, it also introduces a serious diode reverse-recovery problem and increases the turn-on loss obviously due to the poor parasitic body diode...
A simple third-order equivalent circuit model of series resonant converter (SRC) is proposed in this paper. Up to now, the most successful equivalent circuit model of SRC is based on extended describing function concept, which is proposed by Dr. E. Yang [30]. However, the equivalent circuit is a complicated fifth-order circuit with the cross-coupling effect and no analytical solution is provided for...
This work investigates common mode (CM) voltage stress and circulating ground currents in two proposed power electronic interfaces for integrating next-generation offshore wind turbines (WTGs) to medium voltage DC (MVDC) collection grids. In addition to the DC CM voltage imposed by the MVDC grid, the use of switching power electronics results in high frequency (HF) CM voltage applied to the HF isolation...
In this paper, a new common inductor current sharing method is proposed for multi-phase LLC resonant converter for high power application. Automatic current sharing is achieved by using a common resonant inductor for all the LLC resonant stages, by connecting the resonant inductors in each phase in parallel. The proposed method can automatically share the load current without any additional circuit...
This paper points out the low accuracy of the traditional fundamental harmonic approximation (FHA) in predicting the gain characteristics and resonant behaviors of the full-bridge isolated bidirectional CLLC resonant converter, which results in great impediments in optimally designing the resonant tank parameters. Given these drawbacks of FHA for CLLC converter, this paper proposes a novel operation...
The instantaneous output power of the two-stage single-phase inverter pulsates at twice the output voltage frequency, resulting in the second harmonic current (SHC) in the input voltage source and the front-end dc-dc converter. To keep the input voltage source and the front-end dc-dc converter free from the negative effects brought by SHC, special considerations shall be taken on the control scheme...
Zero-Voltage Transition (ZVT) DC-DC converters with active snubber can be used in photovoltaic applications requiring high efficiency and high-frequency isolation transformer. In order to improve the dynamic response of ZVT converters, two different current control strategies, namely Feed Forward and Dead-Beat, are proposed. The Feed Forward and Dead-Beat control, both based on the converter electrical...
This paper discuss a rectifier-inverter composed of two three-leg converters with unequal DC-links connected in series. This increases the number of voltage levels and contributes to reduce harmonic distortion and losses. Several PWM strategies are discussed (Space-Vector, Level-Shifted and Hybrid Level-Shifted PWM). The balance of separated DC sources is addressed in this paper. In order to achieve...
This paper presents a new connection method of triple two-level PWM converters to provide multi-level output waveform to a motor/transformer which has triple independent sets of three-phase winding. By simply changing the connection between the PWM converters and the windings of the motor/transformer, the level of winding voltage can be increased without any hardware modification. With triple 2-level...
Medium-voltage motor drive systems, medium-voltage inverters, which have an input voltage and an output voltage of 3.3 kV or 6.6 kV, are widely used in industry applications. In the medium-voltage inverter, robust galvanic isolation among a control circuit and each gate drive supplies is required in order to drive high-voltage switching devices. In present, a transformer, which is designed to satisfy...
This paper presents a three-port soft switching dc-dc converter topology based on the bidirectional version of the three-state switching cell (3SSC) and dual active bridge (DAB), feasible to interconnect battery banks with a dc link and photovoltaic panels. The converter features high voltage gain and current reduced stress in the converter primary switches. All active switches are designed to operate...
Solving a short mileage and a long charging time is indispensable to putting electrical vehicles (EVs) on the full-scale market. A moving wireless power transfer (WPT) system is one of the effective solutions, because it can feed electric power to moving EVs. This paper proposes a moving WPT system consisting of several stationary ground-side (primary) coils and a moving vehicle-side (secondary) coil...
Many Solid-State Transformer (SST) concepts employ cascaded AC/DC converter cells to handle the comparatively high medium-voltage (MV) grid voltages, resulting in a phase-modular structure. Accordingly, each cell — formed by an AC/DC input stage and an isolated DC/DC output stage — processes a power fluctuating with twice the grid frequency. The series resonant converter (SRC) operated in the half-cycle...
This paper presents a new dc-dc converter derived from the Triple-Active Bridge (TAB). The proposed converter (here named DAB+DAB) has twice the gain of a conventional Dual-Active Bridge (DAB) converter, four bidirectional ports and can operate as interface between unipolar and bipolar dc networks or as a high-gain DAB. The DAB+DAB have ease making and operation, presenting great potential to be used...
Capacitor coupled dc-dc converter capable of arbitrary high voltage transformation has been recently introduced. The converter consists of a high frequency inverter feeding several rectifiers in parallel through capacitor coupling. The output voltages of the rectifiers are series connected to feed a high voltage dc load. This paper presents a simplified averaged equivalent circuit model for this converter...
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