Improving PMUT Receive Sensitivity via DC Bias and Piezoelectric Composition [PDF]
Sensors, 2022 The receive sensitivity of lead zirconate titanate (PZT) piezoelectric micromachined ultrasound transducers (PMUTs) was improved by applying a DC bias during operation.
Christopher Cheng +6 more
doaj +2 more sources
Research on Transient DC Bias Analysis and Suppression in EPS DAB DC-DC Converter [PDF]
IEEE Access, 2020 During excitation and demagnetization phase for the superconducting magnet, in dual-active-bridge (DAB) converter based power supply, a dc bias may occur in high-frequency transformer and thus lead to the faults.
Tianli Dai +6 more
doaj +3 more sources
Validity Evaluation Method Based on Data Driving for On-Line Monitoring Data of Transformer under DC-Bias [PDF]
Sensors, 2020 The DC-bias monitoring device of a transformer is easily affected by external noise interference, equipment aging, and communication failure, which makes it difficult to guarantee the validity of monitoring data and causes great problems for future data ...
Yuanda He +3 more
doaj +2 more sources
Characteristic Extraction and Assessment Methods for Transformers DC Bias Caused by Metro Stray Currents [PDF]
EntropyMetro stray currents flowing into transformer-neutral points cause the high neutral DC and a transformer to operate in the DC bias state.Because neutral DC caused by stray current varies with time, the neutral DC value cannot be used as the only ...
Aimin Wang +4 more
doaj +2 more sources
Identification of Abnormal Data for Synchronous Monitoring of Transformer DC Bias Based on Multiple Criteria [PDF]
Sensors, 2023 Seriously abnormal data exist in the synchronous monitoring data of transformer DC bias, which causes serious data feature contamination and even affects the identification of transformer DC bias.
Zhongqing Kou +4 more
doaj +2 more sources
On the Implementation of a Compact Vertical DC Biasing Network with Significantly Reduced RF Components for Phase-Shifter-Free Beam Steering [PDF]
SensorsDense direct-current (DC) bias routing and numerous radio-frequency (RF) choke inductors pose major challenges to the practical implementation of phase-shifter-free beam steering using PIN-controlled phase switching.
Shuxin Zheng +3 more
doaj +2 more sources
Analysis of Harmonic Instability of Tokamak Power System Caused by Rectifier Transformer Bias
南方能源建设, 2022 [Introduction] The paper aims to effectively suppress the disturbance of non characteristic harmonics to the power grid in the tokamak power supply system, the paper studies the mechanism of low-frequency harmonics in the tokamak power supply system ...
Jiansheng WANG +3 more
doaj +1 more source
State Identification of Transformer Under DC Bias Based on Wavelet Singular Entropy
IEEE Access, 2021 To identify the DC bias state of transformers, a DC bias state identification method of transformer based on wavelet singular entropy is proposed in this paper. The vibration principle of transformers under DC bias has been analyzed.
Jun Liu +7 more
doaj +1 more source
Overview of Research Status of DC Bias and Its Suppression in Power Transformers
Energies, 2022 In this article, the sources of DC bias and its effects on power transformers are first summarized. Secondly, the article classifies and summarizes the current DC bias calculation problems of power transformers, and puts forward some interesting ...
Youliang Sun +3 more
doaj +1 more source
IEEE Access, 2021 Conventional dc bias suppression strategies mainly rely on a single type of device, such as blocking capacitor or blocking resistance. However, these methods are passive palliatives and cannot restrain dc bias currents from the sources.
Shumin Ma +6 more
doaj +1 more source