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Hybrid LV ac/dc microgrids are being considered for commercial buildings which bring new design requirements for the multiport converter aimed to interface both ac and dc grids. In this paper, we explore the potential to use two well-developed topologies for this targeted application. An optimization-based genetic algorithm which allows to find the best possible choices among different off-the-shelf...
This paper presents a soft switching technique to improve the efficiency of isolated and non-isolated power converters in the high-frequency range. The designed converter uses two switches i.e. main switch and auxiliary switch which are operated in Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) respectively. Here, different circuit modes of ZVS PWM buck converter with the proposed ZCS...
This paper presents analysis, design, and implementation of the high-frequency split-pi converter. Split-Pi converter has distinctive features like the symmetry of the input and the output components. Also, the continuity of the input and output currents makes this converter more desirable in applications like electric vehicles and power management. Split-pi converter is a bi-directional voltage-fed...
In high-power converters based on SiC-MOSFET half-bridge modules, laminated busbar plays a critical role in linking the DC capacitor bank to power modules. The busbar stray capacitance has the same order of magnitude with drain-source capacitance of SiC-MOSFET and has a great impact on the turn-off voltage oscillation of SiC-MOSFET. In this paper, parasitic elements of a three-layer laminated busbar...
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...
High voltage and wide bandgap (WBG) semiconductor devices like the 15 kV SiC MOSFET have attracted a lot of attention because of their potential applications in high voltage and high power converters. However, they are not commercially available at present and their high cost might be a hindrance to their widespread adoption in future. To address the commercial unavailability and the high cost issues...
In this paper, a resonant switched-capacitor dc-dc converter is proposed for data center application. The proposed converter possesses features such as high efficiency, high power density and light-weight. Zero current switching (ZCS) can be achieved with the resonant operation, which allows the converter operating under high efficiency. Proper switching device selection and in-depth power loss analysis...
This paper presents a 1200 V, 120 A SiC phase-leg power module built in a novel low inductive 3D hybrid structure. The power module consists of DBC substrate and Flexible Printed Circuit (FPC) board equipped with SiC MOSFETs and diodes. The parasitic inductance of the power module is significantly minimized by using the FPC board and the proper layout design to 0.79 nH (extracted by Q3D). The power...
This paper presents the operation principle and benefits of a novel power converter topology named three-level two-stage decoupled Active Neutral Point Clamped Converter (3L-TDANPC), which is implemented based on a hybrid utilization of Si IGBTs and SiC MOSFETs. The 3L-TDANPC converter can achieve high efficiency with limited number of SiC MOSFET modules while keeping balanced distribution among the...
Due to the high switching speed of SiC MOSFET, the parasitic parameters and the low damping in the circuit, the turn-off overvoltage and oscillation of the freewheeling diode and SiC MOSFET are very severe. Based on the terminal impedances during the turn-off transition of the freewheeling diode and SiC MOSFET, the mechanism of the turn-off overvoltage and oscillation are analyzed and the suppressing...
A series of star-structured switched-capacitor equalizers (SSSCEs) are proposed to achieve high balancing speed and efficiency independent of the cell number and the cell voltage distribution without significant influences on the size, cost, control, and reliability compared with the classical switched-capacitor equalizer (CSCE). The proposed topologies use the least MOSFETs and capacitors to achieve...
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 has put forward a breakthrough design method for 5G power lighting and thermal. In order to improve the outdoor lightning protection ability, this paper presents a simplified compact lightning protection circuit, whose lightning protection ability can reach 20KA. It also advises to add an ORing MOSFET at the output end of power system, to solve the problem of the limit-exceeding of the...
In this paper, design considerations for transitioning from a Si-IGBT based inverter to a SiC-MOSFET based inverter are discussed. An existing Si-IGBT power structure is modified using a footprint compatible SiC-MOSFET module, with changes made to the power structure and gate drive for the high PWM switching frequency required for SiC devices. Design issues such as inductance minimization, EMC mitigation...
In this paper, the low voltage and high current driver is used as an example to analyze and suppress the EMC problem caused by DC / DC power conversion. In the process of low-voltage and high-current driver design, the problem of misalignment of the drive signal occurs. The paper analyzes the mechanism of the electromagnetic interference in the switch process, and then detects the electromagnetic...
This paper presents a flyback converter based partial power processing structure for battery energy storage system (BESS). It combines both of the battery balancing functionality and power stage regulation functionality into one system. The proposed BESS only have one control variable which is the common duty cycle for all the flyback converters. It is used for the voltage or current regulation. There...
For the input Conducted Emission in the rectifier with high efficiency and high power density, some common measures are very limited and cannot be used. In this, adopt some new measures and make the input Conducted Emission pass the test standard, all of the measures carried out are analyzed in detail.
In this work, a novel dc-dc converter topology, an adaptation of the Hybrid Switched Capacitor Circuit (HSCC), is considered for use in high-gain, high voltage applications that also require high efficiency and superior power density. In particular, a bipolar HSCC design is described, and a candidate control methodology is set forth and developed analytically. The converter performance is demonstrated...
SiC power devices exhibit low on-resistance and are capable of processing high switching frequencies at elevated temperatures. When SiC MOSFETs are employed as switch, minimizing switching power losses is crucial. A proper design of gate driving circuit for SiC MOSFET can ensure minimum losses, safe operation of the device and reliable performance. A comparative study of gate drivers for SiC MOSFETs...
The objective of the concept of T-type Modular Multilevel Converter (TMMC) is to improve the power density of the traditional Modular Multilevel Converter (MMC) exploited in medium voltage motor drive. The size of the major volume contributor “capacitor” can be reduced by 30%∼40% with the proposed circuit operating at only half dc link voltage at low frequency low voltage region, which is enabled...
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