In this article, a multi-event time-to-digital converter (TDC) with high conversion rate using an interpolator recycling technique is proposed. The dead time greatly reduced by reusing the coarse interpolation channel (CIC) during quantization of Start and Stop signals. A resolution achieved coarse–fine calibration-free high-linearity amplifier (TA). flash sub-TDC novel fully symmetric (FSQ) scheme proposed to implement fine interpolation, which helps improve linearity. An ultra-low static...

The development of solid-state nonlinear optical limiting (NOL) materials is crucial for advancing the practicality in field limiting. In this paper, we innovatively prepare a new solid NOL material which spiral carbon nanotubes doped epoxy resin (SCNTs-doped ER, SER) with simple physical mixing method, and achieve an excellent performance. We experimentally measured SER different SCNTs concentrations (0.14, 0.28, 0.43 mg/mL) obtained absorption coefficient, refractive index, third-order...

A cost-effective totem-pole power factor correction converter with high-frequency gallium nitride high electron-mobility transistors and low-frequency Si diodes is investigated in this article. The reverse recovery characteristics of are evaluated experimentally. With the slow characteristics, a negative current can flow through low frequency diode, so that soft-switching critical mode operation achieved easily. However, if duration exceeds time diode will switch at frequency, leading to...

The widespread integration of various nonlinear power electronic devices in modern systems has made harmonic distortion more serious than ever before. Given the urgent need to improve quality, contribution evaluation (HCE) is great importance since it can provide a strong basis for mitigation measures. However, conventional HCE methods are not effective due lack synchronous voltage and current phasor information real-field practice. To overcome limitation, an method based on generalized...

With the increase of power electronic devices such as distributed renewable energies, energy storage, and flexible loads, disturbance sources are rapidly raised in multiple voltage levels network. The harmonics they produce random uncertain, massive amounts data propose high demands on server computing capability, which restrict harmonic evaluation significantly influence judgments quality distribution In order to improve source function network, this paper, a framework for multi-harmonic...

This work investigated the impact of periodic thickness and doping region on efficiency P-type AlGaN superlattice. In this paper, band structure simulated superlattice was analyzed. The Al

By means of nanophotonics principle, the thermal radiation can be tailored, thus, traditional tungsten lamp light source glow vitality and vigor due to low-efficiency approaching commercial fluorescent or light-emitting diode bulbs. However, too far by demanding exacting terms, such as high-temperature (∼ 3000 K), high-vacuum encapsulation technology, restricted spectrally controllable so on, tungsten-based incandescent filament has greatly limited application in lighting, diagnosis...

The purpose is to realize the decentralized microgrid economic dispatch, improve information transparency and security of systems, make power grid move towards a clean, safe, efficient, reliable development path. Deep learning optimization dispatch wireless transmission based on blockchain technology are studied. First, related theories methods transmission, deep introduced. Next, simulated analyzed large scale. Finally, comparison results between common radio energy technologies analyzed....

Simulations are carried out to explore the possibility of achieving high breakdown voltage GaN HEMT (high-electron mobility transistor). cap layers with gradual increase in doping concentration from 2 × 1016 5 1019 cm−3 N-type and P-type investigated, respectively. Simulation results show that P-doped layer shows more potential achieve higher than N-doped under same concentration. This is because ionized net negative space charges P-GaN could modulate surface electric field which makes...

Under the current trend of power electronics in energy systems, a high percentage renewable transports clean to grid through grid-connected inverters. The pulse-width modulation (PWM) technique brings high-order harmonics near switching frequency, and LCL filters with low-pass characteristics become common choice for However, low-order caused by nonideal are difficult filter out, new resonance point introduced causes security problem systems. Firstly, generation mechanism 6 k ± 1 order...

With the increasing applications of high-power lasers in fields such as laser fabrication, measurement, therapy and scientific research, there is an demand for high-performance nonlinear optical limiters (NOLs) to protect human eyes sensitive elements. Here we propose a brand-new approach design reflective NOL with ultra-wide stop band based on coupled Tamm plasmon polaritons (TPPs) Kerr effect. The permits transmission weak signal light at desired wavelength while effectively blocking...

SPAD-based dToF sensors employ Time-Correlated Single Photon Counting (TCSPC) to accurately determine the ToF information. The multi-event time-to-digital converter (TDC) with low dead time is crucial mitigate pile-up distortion. Similarly, linear-mode pay more attention TDC resolution. A histogramming [1] has achieved a conversion rate of 14 GS/s, but its resolution limited by gate delay. 50 MS/s presented in [2]. linearity performance deteriorated due only one interpolator used, and...

A new system structure of two-stage high-gain bidirectional DC/AC converter is presented for energy storage applications. Varies kinds high step-up/step-down DC/DC converters and single-phase/three-phase dual-input applicable in the structure. specific topology single-phase analyzed detail. Two power interfacing ports, i.e. a low voltage battery, AC grid, two DC-buses, an intermediate DC-bus, are provided by converter. input converted three-port which integrates non-isolated buck/boost DC...

In this paper, an on-board charger for electric vehicle, with two-stage power converter, is designed. Firstly, a single-phase Boost-APFC (Active Power Factor Correction) circuit controlled by one-cycle controller designed as the front state converter. Compared to traditional APFC circuit, One-cycle constructed without considering multiplier and AC line voltage sensing circuits, which suitable system. Moreover, one cycle converter has strong ability reject input disturbance. After that,...

In order to take into account the nanoscale heat generation and phonon conduction, optical acoustic temperature system for TCAD simulation is developed self-consistently coupled with hydrodynamic transport model. This electrothermal model validated through simulations of a thin-body SOI NMOSFET.

An adaptive compensation zero circuit for a DC–DC buck converter is presented. The resistance of the proportional compensator dynamically adjusted according to different output load conditions, and achieves an adequate system phase margin under conditions. In experimented load-transient response, dip voltage 50 mV maximum settling time 25 µs are observed with proposed current variation from 0 1 A.

Optimal design of the planar integrated inductor is presented for a hybrid totem-pole bridgeless power factor correction (PFC) converter with high frequency GaN-based switching leg and low Si-diode-based leg. The PFC can be up to MHz by adopting critical mode (CRM) soft-switching operation mode. In order achieve lower height density, split into two small inductors then implemented magnetic core. Footprint loss different core structure are analyzed compared. method as well. Finally, 700kHz...

In this paper, a controlled-type ZVS technique for totem-pole PFC rectifier with limited maximum switching frequency operating in boundary conduction mode and discontinuous is studied. Conventional methods may require detecting zero crossing point of inductor current or implanting auxiliary circuits. To avoid this, cost-effective based on software calculation without hardware circuits SR time extension applied to compensate the non-ZVS region. By limiting near AC gird voltage light-load...

The neutral point voltage balance control for back-to-back NPC converter used in the wind power application is researched this paper. two main operation modes are focused to analyze possible problems of control, based on which a coordinated method regulation proposed suppress its drift. According conditions generation, only grid side (GSC) has function when it's at standby mode or under light load such as during soft cut-in process, while GSC predominates both and rotor (RSC) have abilities...

Quantity Surveyors all around the world have been adopting digital technologies due to their tremendous benefits. However, digitalization among quantity surveyors in Malaysia is slow low technology adoption. Therefore, this study aims identify barriers surveying profession and recommend strategies minimize those barriers. A quantitative approach was applied with questionnaires serving as data collection instrument. The were distributed 671 registered Malaysia, which obtained through random...

Molybdenum disulfide (MoS2) has drawn great interest for tunable photonics and optoelectronics advancement. Its solution processing, though scalable, results in randomly networked ensembles of discrete nanosheets with compromised properties device fabrication. Here, we show via density-functional theory calculations that the electronic structure individual solution-processed can be modulated by external electric fields collectively. Particularly, form Stark ladders, leading to variations...