Results 261 to 270 of about 2,950,870 (336)

Impedance of DC-bias-controlled composite FBARs

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2013
A closed-form analytic formula is derived for composite resonators consisting of two layers of paraelectricphase ferroelectrics. It is used to analyze the properties of these resonators. Under an applied dc electric field, the layers exhibit an induced piezoelectric effect.
Spartak, Gevorgian, Andrei, Vorobiev
openaire   +2 more sources

ILC-Based Voltage Compensation Method for PMSM Sensorless Control Considering Inverter Nonlinearity and Sampling Current DC Bias

IEEE transactions on industrial electronics (1982. Print), 2020
Inverter nonlinearity and sampling current dc bias can cause harmonic distortion of estimated back electromotive forces (EMFs), and therefore results in position estimation error and degrades control performance of model-based sensorless techniques of ...
Yangrui Wang, Yongxiang Xu, J. Zou
semanticscholar   +1 more source

A Minimum-Order BEMF Observer for DC-Bias Elimination of Position-Sensorless PMSM Drives Using Backstepping Design

IEEE transactions on industrial electronics (1982. Print)
The back electromotive force (BEMF) observer is an effective model-based method for the permanent magnet synchronous motor (PMSM) sensorless drive in medium- and high-speed range.
Pengcheng Du, Bo Wang, Dianguo Xu
semanticscholar   +1 more source

Transformer DC Bias Detection: Using Differential Current Waveforms

IEEE Industry Applications Magazine
This article proposes a dc bias detection method for power transformers that utilizes the three-phase differential current waveforms available in transformer differential relays.
Babak Ahmadzadeh-Shooshtari, A. Rezaei-Zare   +1 more
semanticscholar   +1 more source

A simple DC bias elimination technique for Dual-Active-Bridge DC/DC converters

2019 10th International Conference on Power Electronics and ECCE Asia (ICPE 2019 - ECCE Asia), 2019
A new and simple DC bias elimination technique for a Dual-Active-Bridge DC/DC converter is proposed in this paper. The principle is to make the positive and negative volt-seconds of the magnetizing inductance balance when the phase shift changes. This can be done with minimum disruption on the overall control system by some minor modifications on the ...
Duy-Dinh Nguyen, Kazuto Yukita, Goro Fujita, Minh Cao Ta   +3 more
openaire   +1 more source

Fast DC-Bias Current Control of Dual Active Bridge Converters With Feedforward Compensation

IEEE Transactions on Circuits and Systems - II - Express Briefs, 2020
In bi-directional dual active bridge (DAB) converters, the current flowing through the transformer generates significant DC-bias currents when the load of the converter changes, leading to unavoidable magnetic saturation of the high-frequency transformer.
Zhendong Ji, Qiantong Wang, Dongye Li, Yichao Sun   +3 more
semanticscholar   +1 more source

dc Bias-Sputtered Aluminum Films

Journal of Vacuum Science and Technology, 1973
Low resistivity aluminum films have been deposited by dc bias sputtering without excessive presputtering. Minimum resistivity occurs for a bias (VB) of approximately −40 V and, in contrast to the case for sputtered molybdenum, the resistivity increases for higher negative biases.
openaire   +1 more source

Calculation of DC Bias Reactive Power Loss of Converter Transformer via Finite Element Analysis

IEEE Transactions on Power Delivery, 2020
This paper proposes a novel and applicable approach to calculate the reactive power loss of converter transformer under dc bias. By using this proposed method, only general information of the converter transformer and the network is needed for the ...
Xiaoyue Zhang, Xinghua Liu, Fanghong Guo, Gaoxi Xiao, Peng Wang   +4 more
semanticscholar   +1 more source

Advanced DC Bias Suppression Strategy based on Finite DC Blocking Devices

IEEE Transactions on Power Delivery, 2017
The ground return current of a high voltage direct current system will intrude the transformers adjacent to the grounding electrode in the case of monopole operation, leading to the half-cycle saturation of transformers. To mitigate the adverse effect, placing dc blocking devices (BDs) in transformer neutrals is popularly advocated.
Zhicheng Xie, Xiangning Lin, Zheyuan ZHANG, Zhengtian Li, Weihong Xiong, Huan Hu, Muhammad Shoaib Khalid, Owolabi Sunday Adio   +7 more
openaire   +1 more source

Novel Fe-based amorphous compound powder cores with enhanced DC bias performance by adding FeCo alloy powder

, 2020
Novel amorphous magnetic-compound powder cores (AMPCs) composed of a mixture of water-atomized FeSiBPNbCr amorphous powder and FeCo alloy powder were successfully fabricated through cold pressing.
Yiqun Zhang, Q. Chi, Liang Chang, Yaqiang Dong, P. Cai, Yan Pan, M. Gong, Jianjun Huang, Jiawei Li, Aina He, Xin-min Wang   +10 more
semanticscholar   +1 more source