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Internal network boundary condition (INBC) incorporated in Finite-difference Time-domain (FDTD) algorithm to efficiently simulate low-profile periodic structure is proposed. The method is based on vector fitting (VF) approach to approximate the 2-port Y-matrix network parameters of the periodic structure by a series of partial fractions in terms of real or complex conjugate pole-residue pairs, which...
In the new energy power generation, software phase locked loop is an important part of the grid connected converter. In the unbalanced and harmonic power system, the accuracy and speed of traditional phase locked loop is unable to meet the needs of high performance converter at the same time. The frequency conversion PLL based on frequency conversion filter and amplitude phase compensation precisely...
Three-phase rectifier topology is given first, on this basis, analyzing the differences of seven-segment SVPWM modulation method and five-segment SVPWM modulation method, and show two kinds of duty ratio calculation formula in different sectors. And then consider the influence of DC-bus voltage, temperature and the IGBT junction temperature on the loss of IGBT, giving different calculation methods...
According to the characteristics of high performance three-phase grid-connected inverters, the strategy of model current predictive control for three-phase grid-connected inverters without PLL is put forward. In each control cycle, the eight voltage vectors of three-phase grid-connected Inverters are calculated in prediction model. The voltage vector which makes the value function minimum is taken...
This paper conducts the performance sensitivity analysis for linear alarm filters. With a derivative-based local sensitivity measure, models are proposed to assess the sensitivity of the system detection errors to changes in the trip point and uncertainties in the collected data. Then, sensitivity formulations for a general linear alarm filter framework with unknown data distributions are studied...
During the control process of the three-phase PWM rectifier, the parameters of the conventional PID controller are kept constant. It's unable to make appropriate changes according to the actual working condition of the rectifier and the change of working environment, which limits the adaptability of the rectifier to environment and working conditions. Against this point, the single neuron adaptive...
The time-triggered principle establishes and maintains a system-wide synchronized time-base by the local clocks of the device. The proposed concept of Time-Triggered Ethernet (TTE) guarantees the determinacy of time-critical message for avionics and safety-critical systems. This paper presents an algorithm based on path-hop of tasks to generate a rational scheduling timetable to ensure is free of...
This paper proposed an equivalent source modeling method of the external complex electromagnetic interference (EMI) coupling on a cable connected to the electronic devices shielded by a chassis. The Norton theorem is used to develop the equivalent circuit of the EMI source. The moment method (MOM) in FEKO is used to calculate the short current and port impedance in Norton equivalent circuit, and curve...
In this talk, regarding to the design of compact filter, one kind of design method based on composite right- and left-handed (CRLH) structures is proposed. Aiming at different desired performances, this method initially starts from equivalent circuit and results in corresponding lumped elements, which are eventually transformed to structural parameters of the desired filters with different performance...
This paper presents a Signal Processing method on Heart Rate Signals Using The Wavelet-based Contourlet Transform and multifractal. The method is based on the Wavelet-based contourlet transform and filter banks. The algorithm implementation process is as follows. Firstly the Wavelet-based contourlet transform orthogonal decomposes heart rate variability signal fractal component. Power spectrum of...
Avionics is an advanced and integrated system that has strong requirement of flexibility, high bandwidth, and stringent end-to-end latency. Among the proposed architecture, Wavelength Division Multiplexing (WDM) network is featured by almost unlimited bandwidth potential and the potential for a unified network with protocol independence which makes it a good choice for avionics systems. A proper design...
• Investigate the architecture of Time-Triggered avionics WDM network which inherits the advantages from both TTE and WDM network • Propose an algorithm which considers the number of hops and distance for the virtual topology • Time scheduling algorithm of terminal and optical switch are also designed • The result shows that TTAWDM can be a totally deterministic network for time-critical message
A novel equivalent circuit for the fishnet metamaterial structure is presented. Using the Rotated Transmission-Line Matrix (RTLM) method, the equivalent circuit of a three-dimensional metamaterial structure is obtained. By firstly employing the circuit model of the multi-resonance hybrid coupled filter, the RTLM equivalent circuit can be well analyzed and used to design high-performance fishnet metamaterial...
We introduce a multi-scale framework for low-level vision, where the goal is estimating physical scene values from image data—such as depth from stereo image pairs. The framework uses a dense, overlapping set of image regions at multiple scales and a “local model,” such as a slanted-plane model for stereo disparity, that is expected to be valid piecewise across the visual field. Estimation is cast...
A novel three-dimensional LC-based metamaterial topology to model traditional fishnet structure is proposed. Rotated Transmission-Line Matrix (RTLM) unit as one independent half cell from the typical Transmission-Line Matrix (TLM) unit with each incident polarization rotated by 45°, is supposed to save the computation time and decrease the processing data when a structure is analyzed, especially when...
This paper proposes new precise equivalent circuit models (ECMs) for circuit analog absorbers consisting of resistors-loaded square loop arrays. Furthermore, a genetic algorithm (GA) is employed to optimize the geometrical parameters and the corresponding impedance properties to achieve different design requirements. For demonstration, two absorbers consisting of single and double square loop arrays...
Fishnet metamaterials consist of two or more conducting fishnet layers separated by homogeneous dielectric layers. Different from other planar multilayer metamaterial structures fishnet metamaterials do not require vias for through-contacting between the layers. This allows low-cost production of three-dimensional metamaterials by spray coating with organic (carbon nanotubes CNTs) or metallic (silver)...
A three-dimensional (3D) technology computer-aided design (TCAD) modeling of guard-drain based on 45-nm CMOS process is presented. Numerical simulations of single-device show that charge collection of the guard-drain technique will higher than that of the conventional technique in different ion incidents. Guard-drain technique fails in helping drain to mitigate single-event transient (SET). Mechanisms...
Ferroelectric random access memory (FeRAM) is a promising candidate to substitute static random access memory (SRAM) in lookup table (LUT) design due to its high density, high speed operation, anti-radiation and non-volatility. Ferroelectric gate field effect transistors (FeFETs) have been extensively studied and its usage in memory elements and basic analog circuit configurations has gained much...
The usage of ferroelectric-gate field effect transistors (FeFET) in digital circuits typically involved that of memory applications, but the use of FeFET to implement logic circuits was not completely understood and had not been extensively studied. This paper presented the simulation of electrical properties of a single FeFET and the results of behavioral characterization of FeFET-based basic logic...
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