Energies, 2018 DC bias is a great threat to the safe operation of power transformers. This paper deals with a new vibration-based technique to diagnose DC bias in power transformers.
Xiaowen Wu +6 more
doaj +1 more source
An Energy-Efficient ADO-OFDM System for Optical Wireless Communication
IEEE Photonics Journal, 2023 This paper proposes an energy-efficient asymmetrically clipped direct-current (DC) biased optical orthogonal frequency division multiplexing (EEADO-OFDM) scheme, which replaces the fixed DC bias of DC biased optical OFDM (DCO-OFDM) branch with a adaptive
Wei-Wen Hu
doaj +1 more source
Strong mechanically-induced effects in DC current-biased suspended Josephson junctions [PDF]
, 2017 Superconductivity is a result of quantum coherence at macroscopic scales. Two superconductors separated by a metallic or insulating weak link exhibit the AC Josephson effect - the conversion of a DC voltage bias into an AC supercurrent.
Deng, Hai-Yao +3 more
core +2 more sources
Reducing AC impedance measurement errors caused by the DC voltage dependence of broadband high-voltage bias-tees [PDF]
, 2007 During the AC impedance characterization of devices, from the kHz-range up to the GHz-range, accuracy can be lost when a DC voltage is applied. Commercial high-voltage broadband bias-tees are often voltage-dependent, which can cause inaccuracies at low ...
Reimann, K. +2 more
core +2 more sources
Optimal Strategy of Triple Phase Shift Transient DC Bias for Dual Active Bridge DC-DC Converter [PDF]
E3S Web of Conferences, 2020 Under the traditional phase shift control, dual active bridge DC-DC converter (DAB) has a transient bias on the inductance current when the phase shift ratio changes suddenly, which leads to increase in the current stress of switch tubes and even ...
Zhai Jingyu +3 more
doaj +1 more source
Spontaneous DC Current Generation in a Resistively Shunted Semiconductor Superlattice Driven by a TeraHertz Field [PDF]
, 1997 We study a resistively shunted semiconductor superlattice subject to a high-frequency electric field. Using a balance equation approach that incorporates the influence of the electric circuit, we determine numerically a range of amplitude and frequency ...
A. A. Ignatov +25 more
core +4 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. The adoption of high-frequency transformer provides galvanic isolation, but also brings the possibility of dc bias.
Liangcai Shu, Wu Chen, Zhanfei Song
openaire +1 more source
Projecting GaN HEMTs lifetimes under typical stresses commonly observed in DC-DC converters
Power Electronic Devices and Components, 2023 DC-DC converters exist in virtually every application of modern power electronics. Due to small die size, low on-resistance, and low parasitic capacitance, GaN power devices offer superior conversion efficiency and record-setting power density.
Shengke Zhang +9 more
doaj +1 more source
Probing e-e interactions in a periodic array of GaAs quantum wires [PDF]
, 2007 We present the results of non-linear tunnelling spectroscopy between an array of independent quantum wires and an adjacent two-dimensional electron gas (2DEG) in a double-quantum-well structure.
A.J. Schofield +17 more
core +2 more sources
Pumping charge with ac magnetic fluxes and the dynamical breakdown of Onsager symmetry [PDF]
, 2013 We study the transport properties of setups with one and two mesoscopic rings threaded by ac magnetic fluxes of the form \Phi(t)=\Phi^{dc} + \Phi^{ac} cos(\Omega_0 t + \delta) and connected to two different particle reservoirs.
Arrachea, Liliana +1 more
core +3 more sources