Results 11 to 20 of about 2,950,870 (336)
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 +3 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 +4 more sources
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 +2 more sources
IEEE Access, 2021 Loss and temperature increase due to DC bias occurring in power transformers may lead to damage and reduced lifespan. To study the influence of different levels of DC bias on the temperature rise in transformer structural components, 0, 8, and 16 A DC ...
Mingyang Li +4 more
doaj +2 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
Prediction Method of DC Bias in DC-DC Dual-Active-Bridge Converter
CPSS Transactions on Power Electronics and Applications, 2019 The dual-active-bridge (DAB) converter attracts more and more attentions due to its ability of bidirectional power transmission and high conversion efficiency.
Liangcai Shu, Wu Chen, Zhanfei Song
semanticscholar +2 more sources
DC-Bias for Optical OFDM in Visible Light Communications [PDF]
IEEE Access, 2019 The requirement of a DC-bias is known to make DC-biased optical orthogonal frequency division multiplexing (DCO-OFDM) less energy efficient. This can be improved by asymmetrically clipped optical OFDM (ACO-OFDM), pulse amplitude modulated OFDM (PAM-OFDM)
Xiong Deng +3 more
semanticscholar +3 more sources
The Journal of Engineering, 2019 When the ultra-high-voltage direct current (UHVDC) transmission system operates in a monopolar ground return mode, an enormous DC current flows into earth via the DC grounding electrode in the converter station and then comes into the AC system around ...
Fangjie Wu +3 more
doaj +2 more sources