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High step-up fully soft switched interleaved Sheppard-Taylor converter with only one auxiliary switch for PV application
摘要： This paper presents a high step-up fully soft switching interleaved Sheppard-Taylor converter to be used in PV applications. The proposed converter utilizes only one auxiliary switch to create the soft switching conditions for all semiconductor devices. The converter has a simple structure, and its control circuit remains PWM. Moreover, the auxiliary switch is not located in the main power path; therefore, the conduction losses are decreased, and the overall e?ciency is improved. Besides, the rate of the auxiliary switch current will be very low. On the other hand, the proposed converter has a high-voltage gain. Furthermore, all switches and other circuit elements have low current stress due to the interleaved structure in the proposed converter. The guidelines for the design consideration are presented. A 250 W, 25–250 V laboratory prototype operating at 100 kHz is implemented to verify the performance of the converter and an e?ciency of 96% at full load can be achieved.
关键词： Interleaved,Sheppard-Taylor,PV,Soft Switching,High Gain
更新于2025-09-23 15:21:01
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[Lecture Notes in Electrical Engineering] Microelectronics, Electromagnetics and Telecommunications Volume 521 (Proceedings of the Fourth ICMEET 2018) || Performance Analysis of a PV System Using HGB Converter
摘要： A photovoltaic array based system using a transformer-less high gain interleaved dc–dc boost converter is proposed in this paper. The renewable energy sources such as photovoltaic array and fuel cells provide only a time-varying and low dc voltage which cannot be directly used as the front-end for the loads or dc grid. Hence, there is a need for power electronic interfaces for matching the environmental-friendly sources of energy to the load. The interleaved converter used in the proposed system has the capability of canceling the input current ripple without increasing the component counts in the converter using a preselected duty cycle. Also, the large voltage gain and high ef?ciency of the converter are the added advantages to the proposed system. Analysis, simulation, and experimental investigation of the system proposed were carried out and the results are compared to validate the proposed system effectiveness.
关键词： Photovoltaic array,Interleaving technique,A high gain boost converter,Transformer-less dc–dc converter
更新于2025-09-23 15:21:01
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Largea??Scale Ultrathin 2D Widea??Bandgap BiOBr Nanoflakes for Gatea??Controlled Deepa??Ultraviolet Phototransistors
摘要： Ternary two-dimensional (2D) semiconductors with controllable wide bandgap, high ultraviolet (UV) absorption coefficient, and critical tuning freedom degree of stoichiometry variation have a great application prospect for UV detection. However, as-reported ternary 2D semiconductors often possess a bandgap below 3.0 eV, which must be further enlarged to achieve comprehensively improved UV, especially deep-UV (DUV), detection capacity. Herein, sub-one-unit-cell 2D monolayer BiOBr nanoflakes (≈0.57 nm) with a large size of 70 μm are synthesized for high-performance DUV detection due to the large bandgap of 3.69 eV. Phototransistors based on the 2D ultrathin BiOBr nanoflakes deliver remarkable DUV detection performance including ultrahigh photoresponsivity (Rλ, 12739.13 A W?1), ultrahigh external quantum efficiency (EQE, 6.46 × 106%), and excellent detectivity (D*, 8.37 × 1012 Jones) at 245 nm with a gate voltage (Vg) of 35 V attributed to the photogating effects. The ultrafast response (τrise = 102 μs) can be achieved by utilizing photoconduction effects at Vg of ?40 V. The combination of photocurrent generation mechanisms for BiOBr-based phototransistors controlled by Vg can pave a way for designing novel 2D optoelectronic materials to achieve optimal device performance.
关键词： monolayer BiOBr,deep UV phototransistors,wide-bandgap semiconductors,high gain
更新于2025-09-23 15:19:57
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ANFIS Based Voltage Determination for Photovoltaic Systems According to the Specific Cell Parameters, and a Simulation for the Non-Isolated High Gain DCa??DC Boost Converter Control Regard to Voltage Fluctuations
摘要： In this study, a solar panel is modeled and parametric simulation studies are performed with Ansys-Electronics 2019 R2 software according to atmospheric and temperature coefficient parameters that affect the efficiency of electrical energy produced in photovoltaic (PV) systems. Based on parametric simulation studies, 482 data of the voltage value of the electrical energy produced were obtained. Then a certain part of this data was used for training in Adaptive Network Fuzzy Inference System (ANFIS) algorithms and the system was tested with the estimated values produced. Thus, in the generation of solar and electrical energy, the duty ratio controller performance designed with an uninsulated DC–DC converter circuit proposed to generate a 400 V constant value DC bus voltage at the output due to voltage changes at the input is reported.
关键词： Non-Isolated High Gain converter,photovoltaic (PV) systems,parametric simulation,Adaptive Network Fuzzy Inference System (ANFIS)
更新于2025-09-23 15:19:57
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Design of a High-Gain Millimeter-Wave Antenna Using Characteristic Modes
摘要： This paper proposes the use of the Theory of Characteristic Modes to aid the design of high-gain antennas for mm-wave applications. A new lens antenna operating in the 19 to 22 GHz band is proposed. The lens consists of two metallic rings distributed in two layers and illuminated by a square aperture. The Theory of Characteristic Modes is used to analyze the proposed antenna in order to provide insight into the radiation characteristics of the structure. The proposed antenna has been optimized, obtaining a large bandwidth and a maximum directivity of 11.19 dBi at 22 GHz.
关键词： propagation,characteristic modes,high gain,Lens antenna
更新于2025-09-19 17:15:36
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - V-Band High-Gain Slot Antenna Using Single Layer Partially Reflective Surface
摘要： In this paper, a novel design of a high-gain and wideband slot antenna operating at V-band is presented. The gain and bandwidth enhancements are achieved by feeding a simple radiating slot with a ridge-gap waveguide and placing a single layer superstrate above the antenna. The superstrate is based on a complementary frequency selective surface which provides positive phase gradient over the frequency range 47 to 65 GHz. Numerical simulations of the proposed design demonstrate a gain enhancement of 8.3 dB at 63 GHz when compared with the antenna without the superstrate, and 3-dB gain bandwidth of about 5 GHz. Moreover, the antenna is matched to the feeding ridge-gap waveguide over the frequency range of 56.0 to 66.7 GHz.
关键词： ridge-gap waveguide,high-gain,V-band
更新于2025-09-19 17:15:36
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A Compact Wideband High-Gain Metasurface-Lens-Corrected Conical Horn Antenna
摘要： In this paper, a compact wideband high-gain metasurface-lens-corrected conical horn (meta-horn) antenna is developed. A metasurface lens that has a thickness of less than 0.1λ is developed to provide wideband transmission phase compensation, with high transmission efficiency. The ultra-thin lens is then used to develop a wideband high-gain horn antenna that has a shorter horn length and a large flare angle, resulting in a compact horn structure that is easy to be fabricated and mounted, and at a low cost. Simulations and experiments were conducted to demonstrate the effectiveness of the design. Measured results show that the meta-horn has a peak gain of 24.2 dBi and a 3-dB gain bandwidth of over 26%.
关键词： horn antenna,flare angle,metasurface lens,high-gain
更新于2025-09-19 17:15:36
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[IEEE 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Auckland (2018.8.5-2018.8.8)] 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - A Miniaturized Double-Vivaldi Antenna With Improved Gain Based on a Novel Metasurface
摘要： A miniaturized double-Vivaldi antenna (DVA) with high gain based on metasurface (MS) is proposed. A pair of defected ground slots (DGS) are added to the edges of the antenna to extend the low-end frequency limitation from 2.15 GHz to 1 GHz. Then, the gain of DVA is improved obviously in a wide frequency band by the inclusion of a MS in the aperture. The novel unit cell of the MS in our design is a two-stub-loaded split-ring resonator (TSLSRR), which has compact size, wide frequency band, and low-return loss. Finally, to verify the designed methods, DVA, DVA with DGS (DVA-DGS), DVA with DGS and MS (DVA-DGS-MS) ware successfully designed, and it show an overall size of 80 mm × 150 mm × 1 mm.
关键词： wideband and low-return loss metasurface,Double-Vivaldi antenna,high-gain,defected ground slot
更新于2025-09-19 17:15:36
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[IEEE 2018 Asia-Pacific Microwave Conference (APMC) - Kyoto, Japan (2018.11.6-2018.11.9)] 2018 Asia-Pacific Microwave Conference (APMC) - A Low-Profile and High-Gain Circularly Polarized Antenna Based on Holographic Principle
摘要： This paper presents a low-profile and high-gain right circularly polarized antenna based on holographic artificial impedance surface. The holographic antenna (HA) is comprised of around 2000 various elements printed on grounded dielectric substrate, excited by a horizontally omnidirectional ring-slot antenna. By using anisotropic rectangle patch as unit cell, the cross polarization is suppressed and the cross-polar level is of -37.8 dB in broadside. The -10 dB impedance bandwith covers 9 GHz to 11 GHz and the 3-dB axial ratio bandwith covers 9.12 GHz to 11 GHz. The maximum right circularly polarized gain is 20.8 dB and the 3-dB beamwidth is 6.08° at 20 GHz. The simulated results show the proposed antenna possesses low-profile, high-gain, and narrow pencil beam in the operating band.
关键词： circularly polarized,high-gain,low-profile,holographic antenna
更新于2025-09-19 17:15:36
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Compact High Gain Leaky-Wave Antennas Based on Substrate Integrated Waveguide TE <sub/>220</sub> Mode
摘要： In this paper, novel compact high gain broadband leaky-wave antenna (LWA) using TE220 high-order mode is proposed. The high-order mode antenna not only possesses more compact structure with higher gain, but also simpli?es the feeding network of the antenna array and relaxes processing tolerance. The radiation element consists of an SIW cavity etched with 2 × 2 slot array on the top surface, which is excited by a microstrip-slot coupling structure. Microstrip spoof surface plasmon polariton (SPP) is worked as a slow-wave transmission line (TL) to increase the beam scanning range of a four elements periodic array antenna. The antenna was simulated, optimized and fabricated, which veri?ed theoretical analysis. Experimental results show that the linearly polarized (LP) beam scanning antenna has a bandwidth of 53.5% (from 12.6 GHz to 21.8 GHz) with beam scanning range from ?24? to +32? and gain in the range of 10.2 dBi to 12.4 dBi. Then a linear-to-circular polarization converter is loaded to implement a circular polarization (CP) beam scanning antenna. The proposed antenna has the features of compact size, low pro?le, high gain, large beam scanning range and ?exible polarization conversion.
关键词： high-order mode,high gain,spoof surface plasmon polariton,Beam scanning antenna
更新于2025-09-19 17:13:59