Reliable power supply is of great significance to the stable operation of the online monitoring device. This paper studies a kind of electric energy collection power supply based on the principle of current mutual inductance. The iron core is made of nanocrystalline alloy with high permeability, and the relationship between the number of turns and the energy consumption power is analyzed by equivalent circuit. A discharge circuit is formed by connecting multiple diodes in series to avoid oversaturation of the iron core, and the residual voltage on the diode supplies the load electric energy. Combined with simulation and experiment, the number of turns and the number of diodes in series are optimized, so that the power supply has high efficiency and is not easy to be deeply saturated. The rectifier bridge and DC-DC voltage regulator module are used to stabilize the output voltage. The test shows that the power supply can support reliable energy extraction within the range of wire current of 17A at least and 1000A at most, and can be applied to lines of various voltage levels.
A novel quasi-planar five-port E-plane waveguide power divider with new computer-aided design method is proposed, which lower down the fabrication costs and expand application of waveguide components in the higher frequency ranges, integrations and massive die-casting productions of microwave circuits. A sample, planar five-port E-plane power divider operating between 3.1GHz and 3.6GHz, is designed from an initial concept of the well-known branch-line waveguide coupler. The sample circuit is fabricated and measured. Tested results show that the input reflection is lower than -25dB, insertion loss lower than 0.1dB. The amplitude difference between two output ports is smaller than 0.04dB, and the phase difference between the two output ports smaller than 0.3 degree.
This letter describes the effectiveness of magnetic field intensity suppression through communication-less impedance adjustment in an inductive power transfer (IPT) system. The impedance adjustment scheme comprises a circuit configuration design that enables adaptive reactance adjustment using a field-effect transistor (FET) bridge-based variable reactor, which includes a coupling-coefficient estimation method for adjusting load resistance. The experimental results show that the load impedance that minimizes the magnetic energy stored in the IPT system can suppress the magnetic field intensity by up to 16.5% with only a 4.8% decrease in power transfer efficiency compared to load impedance that maximizes the power transfer efficiency.
An Ultra-wideband (UWB) bandpass filter (BPF) based on an elliptical open stub-loaded resonator (EOSLR) and dumbbell-sided cross-circle (DSCC) defected ground structure (DGS) is proposed in this paper. The measured results show that the 3dB bandwidth of the filter is 3.49∼11.04GHz, the skirt factor (S.F) is 0.844, the upper stopband rejection is greater than 20dB at 11.70∼26.80GHz, and the stopband width is 15.1GHz. The proposed filter has the advantages of high selectivity and extremely broad upper stopband and it can be applied in UWB Wireless communication system.
This article proposes a CNFET 10T SRAM cell based on Stanford Virtual Source model at 5nm technology node, through optimization design and simulation analysis to select optimum gate widths of transistors to ensure best performance in terms of stability, speed and power consumption. We compare the proposed 10T CNFET SRAM with the optimized 6T CNFET SRAM in . It was found that the timing and power characteristics of the proposed 10T SRAM cell is better than that of the 6T structure, the static power consumption is greatly reduced while the RSNM is improved by 93.5%, read and write EDP are improved by 68.5% and 96%, respectively.
In this letter, a low numerical dispersion error single field (SF) hybrid implicit explicit (HIE) finite-difference time-domain (FDTD) method with artificial anisotropic (AA) parameters, AA-SF-HIE-FDTD for short, is proposed. Based on the formulas of the SF-HIE-FDTD method and by introducing the electric artificial anisotropy parameters, the updated functions for 3-D AA-SF-HIE FDTD can be obtained. The numerical dispersion relation of the AA-SF-HIE-FDTD by Fourier method is investigated. Compared with the conventional SF-HIE-FDTD method, it is found that AA parameters can improve numerical dispersion relation for SF-HIE-FDTD method.
The Electric Mopeds (EM) drive system has the characteristics of frequent startup, rapid change of load disturbance and difficulty of establishing accurate mathematical model, this study proposes a model-free double Fractional-Order integral sliding mode control (DFOISMC). Firstly, a new double Fractional-Order integral sliding mode surface is proposed to enhance the robustness and improve the dynamic response, and to improve flexibility of the conventional integral sliding mode controller (ISMC). Secondly, a super-twisting structure is chosen to suppress chattering phenomenon. Then, the model-free DFOISMC is constructed by utilizing the double Fractional-Order integral sliding mode surface, the super-twisting approach law and the ultra-local dynamic model of EM drive system. Furthermore, the stability of the closed-loop control system under the model-free DFOISMC is proved by the Lyapunov stability theorem. Finally, the digital simulation results demonstrate that the proposed control strategy is highly effective and superior.
This paper presents a high-linearity passive double-balanced mixer with an integrated driver amplifier using the 0.25um GaAs pseudomorphic high electron mobility transistor (pHEMT) process. We adopt a novel diode structure, which improves the linearity of the mixer by increasing the mixer’s intermodulation rejection ratio. An improved Marchand balun is designed to reduce the chip area and simultaneously have a low amplitude and phase imbalance. As a result of the integrated driver amplifier, this mixer can achieve frequency conversion at a lower local oscillator (LO) power. The proposed mixer’s radio frequency (RF) bandwidth is 1.7-4.3GHz, and the intermediate frequency (IF) bandwidth is DC-1.2GHz. The experimental results demonstrate that this mixer has an input 1dB compression point (IP1dB) range of 20-23dBm and a third-order input intercept point (IIP3) range of 25-35dBm at 0dBm LO drive. This mixer’s conversion loss within the operating frequency band is 8.5-10dB. The LO to IF isolation is over 30dB, and the RF to IF isolation can reach 50dB. The total chip area is 1.4×3mm2.