Multi-mode control for photovoltaic grid-connected interleaved flyback micro-inverters to achieve high efficiency in wide load range

2012 ◽  
Author(s):  
Zhiliang Zhang ◽  
Xiao-Fei He ◽  
Xiaoyong Ren ◽  
Xin Li ◽  
Yan-Fei Liu
Keyword(s):  
High Efficiency ◽  
Load Range ◽  
Mode Control ◽  
Multi Mode

An Asynchronous Boost Converter With Time-Based Dual-Mode Control for Wide Load Range and High Efficiency in SSD Applications

2020 ◽  
Vol 67 (12) ◽  
pp. 10520-10530
Author(s):  
Kyoungjin Lee ◽  
Haneul Kim ◽  
Jehyung Yoon ◽  
Hyoung-Seok Oh ◽  
Jin-Hong Park ◽  
...  
Keyword(s):  
High Efficiency ◽  
Boost Converter ◽  
Dual Mode ◽  
Load Range ◽  
Mode Control

Multi-mode controller IC for soft-switched flyback converter with high efficiency over the entire load range

2008 ◽  
Vol 9 (10) ◽  
pp. 1411-1419 ◽  
Author(s):  
Hai Chen ◽  
Meng-lian Zhao ◽  
Xiao-bo Wu ◽  
Xiao-lang Yan
Keyword(s):  
High Efficiency ◽  
Load Range ◽  
Flyback Converter ◽  
Multi Mode

scholarly journals ZVS Auxiliary Circuit for a 10 kW Unregulated LLC Full-Bridge Operating at Resonant Frequency for Aircraft Application

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1850 ◽  
Author(s):  
Yann E. Bouvier ◽  
Diego Serrano ◽  
Uroš Borović ◽  
Gonzalo Moreno ◽  
Miroslav Vasić ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Power Density ◽  
High Efficiency ◽  
Harmonic Approximation ◽  
Maximum Efficiency ◽  
Voltage Gain ◽  
Load Range ◽  
Transition Analysis ◽  
Aircraft Application ◽  
Auxiliary Circuit

In modern aircraft designs, following the More Electrical Aircraft (MEA) philosophy, there is a growing need for new high-power converters. In this context, innovative solutions to provide high efficiency and power density are required. This paper proposes an unregulated LLC full-bridge operating at resonant frequency to obtain a constant gain at all loads. The first harmonic approximation (FHA) model is not accurate enough to estimate the voltage gain in converters with high parasitic resistance. A modified FHA model is proposed for voltage gain analysis, and time-based models are used to calculate the instantaneous current required for the ZVS transition analysis. A method using charge instead of current is proposed and used for this ZVS analysis. Using this method, an auxiliary circuit is proposed to achieve complete ZVS within the whole load range, avoiding a gapped transformer design and increasing the efficiency and power density. A 28 Vdc output voltage prototype, with 10 kW peak output power, has been developed to validate the theoretical analysis and the proposed auxiliary circuit. The maximum efficiency (96.3%) is achieved at the nominal power of 5 kW.

A Communication-less Multi-mode Control Approach for Adaptive Power-Sharing in Ships-based Seaport Microgrid

2021 ◽  
pp. 1-1
Author(s):  
Muhammad Umair Mutarraf ◽  
Yacine Terriche ◽  
Mashood Nasir ◽  
Yajuan Guan ◽  
Chun-Lien Su ◽  
...  
Keyword(s):  
Power Sharing ◽  
Control Approach ◽  
Mode Control ◽  
Adaptive Power ◽  
Multi Mode

Indentation Crack Initiation and Ductile to Brittle Transition Behavior of Fused Silica

2013 ◽  
Vol 797 ◽  
pp. 667-672 ◽  
Author(s):  
Peng Yao ◽  
Wei Wang ◽  
Chuan Zhen Huang ◽  
Jun Wang ◽  
Hong Tao Zhu ◽  
...  
Keyword(s):  
Penetration Depth ◽  
High Efficiency ◽  
Fused Silica ◽  
Load Range ◽  
Brittle Transition ◽  
Ductile Mode ◽  
Indentation Crack ◽  
Ultra Precision ◽  
Ductile To Brittle Transition ◽  
Brittle Mode

To provide a fundamental knowledge for the high efficiency grinding and ultra-precision grinding of fused silica, ductile mode and brittle mode material removal mechanisms were investigated by conducting micro/nanoindentation experiments in the range of 4.9 mN - 1960 mN. Before observing cracks and determining the ductile to brittle transition penetration depth, the samples were etched with hydrofluoric acid to expose cracks. The typical damage morphology of fused silica was discussed by observing the surface and cross-section of indentations, and the depth of SSD was found to be determined by the cone cracks or borderline cracks in the different load range. The ductile to brittle transition penetration depth of fused silica under Vickers indentation was 180 nm.

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