A non-segmented PSpice model of silicon carbide metal-oxide semiconductor field effect transistor (SiC mosfet) with temperature-dependent parameters is proposed in this paper, which can improve the model's convergence and temperature characteristics. The equations parameter-extraction method for SiC mosfet are introduced first. Simulation experiment results given to verify correctness while considering parameters. static characteristics verified by comparing simulation curves characteristic...

Solid-state transformers (SSTs) can be applied in the ac/dc hybrid distribution network. The reliability and power density of a solid-state transformer is significantly influenced by insulation design isolated dc–dc converter and, particular, its medium-voltage medium-frequency transformer. This article proposes an method for A novel structure adopted to reduce volume improve heat dissipation performance. Optimization distance parameters performed based on finite-element (FEM) simulations....

An embedded inductor constructed with Sendust powder composite films and circuits is proposed. The consist of mixed flaked powders EPDM rubber. circuit an etched spiral copper trace 16 turns two layers. Copper patterned a dimension 0.025 mm thickness, 0.1 width, pitch. Regarding the performances proposed inductor, it was obtained that simulated inductance resistance are 4.7 uH 770 mΩ, respectively, while measured results 5.0 720 mQ, respectively. Measurements also show has relative high...

A modular DC/DC conversion system with distributed MPPT and centralized step-up converter for photovoltaic energy integrated into HVDC grids is proposed in this paper. The consists of two power stages, as the first stage a second stage. Both stages are structures. For stage, interleaved boost topology utilized to effectively reduce input output ripples without adding extra components. narrow-switching-frequency-variation LLC employed, modules being configured input-parallel-output-series...

A high step-up-ratio DC/DC converter for photovoltaic energy integrated into voltage DC grids is proposed in this paper. The mainly composed of modular conversion modules which are configured as input-parallel-output-series structure. module consisted two power stages, with a boost circuit the first stage and narrow-switching-frequency-variation LLC second stage. interleaved technique effectively reduces input output ripples without adding extra components. Full-range soft-switching property...

A novel isolated high step-up gain DC-DC conversion system for HVDC grid-connected PV power generation applications is proposed in this paper. The has a distributed MPPT and centralized configuration. By employing converter, losses caused by partial shading of the arrays can be reduced significantly. Modular scheme adopted where modulars are configured as input-parallel-output-series structure. detailed realization introduced an example. Interleaved boost topology employed stage, which...

The gallium nitride transistors suffer from current collapse effect in operation regions, which leads the dynamic ON-resistance to increase when high voltage is applied transistor. Dynamic under practical application conditions also an important factor for reliability and conduction efficiency of transistors. To measure evaluate effect, a softswitching circuit based on synchronous buck topology proposed this paper. apply high-voltage high-current stresses device without additional spikes...

Nowadays, the research and design of DC-DC conversion system has become more popular in application photovoltaic generation into medium voltage DC (MVDC)grids. A novel high power modular isolated converter with step-up ratio is proposed as a module this paper. Based on input parallel output series (IPOS)connections converters, easy to achieve capacity voltage. two-stage structure employed converter. The interleaved boost topology applied front-stage, which realizes MPPT for PV arrays low...

The main disadvantage of the voltage‐based maximum power point tracking (VMPPT) method is in way photovoltaic (PV) array disconnected from load when sampling open‐circuit voltage, which inevitably results loss. Another case rapid irradiance variation, where duration between two successive samplings too long, leading to considerable To overcome these problems, this paper proposes a low‐cost analog VMPPT circuit that designed on basis an ultralow‐power sample‐and‐hold with least hardware...

High-power high-frequency transformer is a crucial component of isolated DC-DC converters. To optimize the structure and efficiency high-power transformer, high-precision estimation parameters necessary. This paper proposes to adopt FEA simulations in parameter including dielectric strength for insulation design core loss. In addition, difference loss principle between different types material pointed out. The proposed methods are applied specific case demonstrate effects optimization....

An interleaved buck converter with low conduction losses and reduced diode reverse-recovery problems is proposed in this paper. The circuit consists of two converters one coupled inductor for each phase, operating continuous mode (CCM). Zero-current switching (ZCS) condition duting turn-on transitions significant reduction the associated reverse recovery are accomplished through inductors. phases operate out phase mode. Thus, input output currents can be ripple. Constant frequency operation...

In the application of photovoltaic power generation integrated into MVDC grid, design high-power and high-voltage converters is often a difficult point due to limitations devices themselves. Aiming at high efficiency, adaptive voltage regulation density, interleaved-Boost full-bridge LLC converter (IB-FBLLC) based on all SiC studied designed. For core topology, parameter method efficiency wide bus range proposed. The losses each part as function main parameters are analyzed in this paper, it...

This paper proposed a non-isolated, ultrahigh boost ratio DC-DC converter for low voltage photovoltaic power generation applications. A coupled inductor and charge pump capacitor which operate in hybrid resonant mode are employed the topology. By transferring inductive capacitive energy simultaneously, step-up gain can be achieved without large duty cycle. lossless passive snubber circuit is used to recycle leakage of alleviate high spike across main switch. operating under mode, current...

With the increase of dc based renewable energy generation and loads, medium voltage (MVDC) distribution network is becoming a promising option for more efficient system integration. In particular, large-capacity photovoltaic (PV)-based power growing rapidly, corresponding conversion critical to integrate these large PV systems into MVDC grid. Different from traditional ac grid-connected converters, converter grid interfaced requires over wide range ultra-high step-up ratios. This an...

A novel bridgeless interleaved boost PFC rectifier is proposed for improving power efficiency and system performance in this paper. By combining the conventional topology technology, comprised of two branches without front-end diode bridge. Each branch operates every half-line cycle, together with current following through a minimum number switching devices. using approach, not only decreases stress devices but also reduces voltage ripple. Moreover, as operating critical-conduction-mode...

This paper presents a novel semiconductor switch test platform for power converter optimization which allows to semiconductors under different switching current waveforms. As has major influence on the behavior of and thus losses. Compared with conventional double pulse circuit can only linear waveform, proposed provides programmable source by controlling switches. Experimental results measured from SiC MOSFET have verified effectiveness over circuits.

A novel optimization design method of LLC converter for battery charger applications is proposed in this paper. Wide output voltage range under different load characteristic considered as the main challenge. Input variation also taken into consideration According to charging characteristics, three operating points are selected optimum according preferred charge process. Detailed described. thorough analysis procedure performed. 1.5 kW GaN HEMT based prototype circuit with an 250 V 420 was...

Due to the high-speed switching, switching process of a silicon carbide (SiC) metal oxide field effect transistor (MOSFET) in practical circuit is susceptible parasitics and exhibits significant current voltage overshoots. This may subsequently lower efficiency device, degrade reliability system, increase level electromagnetic interference prohibit full utilization SiC MOSFETs’ potential. Conventional qualitative analysis difficult support enough guidance deal with overshoots practice. In...

This paper presents a wireless power transmission system based on inductive coupling for portable electronic equipment. The consists of transmitter inverter, an inductively link, and receiver rectifier. is full-bridge phase-shift the link composed two loosely coupled inductors. A high frequency bridge rectifier DC/DC converter consist part. To improved performance system, modeling method magnetically addressed analyzed. 20W prototype circuit built tested. As soft magnetic composite sheet...

An improved bridgeless interleaved boost PFC rectifier is proposed to improve power efficiency and component utilization in this paper. By combining the conventional bridge-less circuit technology, comprised of two branches without front-end diode bridge. Auxiliary diodes are employed eliminate undesired circulating loop. The magnetic by symmetrically coupling inductors on unique core. According approach, each switch can operate whole-line cycle. Moreover, not only decreases current stress...

When used in high insulation voltage DC-DC converter occasions, the influence of planar transformer winding structure on loss is more severe. In high-voltage applications, Dowell's classic one-dimensional model and two-dimensional show poor precision due to lack accurate current distribution analysis horizontal direction. To eliminate error, this paper proposes an improved solve detailed PCB windings, which helps further evaluate under frequency. Then analyzed. A designed tested based above...