The behavior of neutral disturbance in arterial vessels has attracted more and attention recent decades because it carries some important information which can be applied to predict diagnose related heart disease, such as arteriosclerosis hypertension, etc. Because the complexity blood flow arteries, is very necessary construct accurate mathematical model analyze mechanical vessels. In this paper, start from basic equations two-dimensional Navier–Stokes equation, vorticity equation...

This paper presents a compact double-sided cooling Gallium Nitride (GaN) power module with low parasitic parameters. The GaN bare dies are sandwiched between two ceramic substrates high thermal conductivity to achieve efficient capability. Through careful design and layout optimization, the bus decoupling capacitors core drive components successfully integrated into reduce critical characteristics of analyzed optimized. Finally, double-pulse-test platform is built based on presented 650V/30A...

This letter proposed a new configuration of neutral point-based common mode (CM) active electromagnetic interference (EMI) filter (NP-CM-AEF). It is achieved by setting the reference filtering system to point equipment under test. Therefore, CM noise could be sensed across and ground. Meanwhile, compensation signal built op-amp re-injected cancel initial noise. The main advantage NP-CM-AEF lies in that no more separation such as bulky passive transformer needed get pure whole becomes...

Hybrid battery/fuel cell power supplies for all-electric Vertical Takeoff and Landing (eVTOL) aircraft enable a high peak capability as well long-range operation. However, the wide overlapping voltage ranges of battery fuel require an interconnecting bidirectional DC-DC converter with buck-boost capability. For such system, gravimetric density is key metric. Therefore, this paper systematically investigates weight limits several topology concepts: Starting from standard two-level four-switch...

Relying on the advantages of small size, good controllability, and consistency, printed circuit board (PCB) inductors are being widely used. For PCB inductors, reducing copper loss is one key issues. Although some research works focus fringing effect in planar winding, there few methods to reduce proximity for inductor. Regarding abovementioned issues, this letter first improves Ferreira's 1-D model accommodate core feature winding: variable number turns per layer. With model, pyramid...

In repetitive pulse power applications, the charging capacitor time occupies most of in a period, and important parameters such as repetition rate are restricted by speed capacitor. To accelerate make full use components' capacity, novel adaptive optimization (AOC) strategy is proposed for supply (CCPS). Moreover, to improve accuracy inductor-capacitor-capacitor (LCC) model, fundamental harmonic approximation model based on continuous resonant current (CRC-FHA) put forward. Compared with...

In high-frequency resonant converters, current transformers (CTs) are commonly used to measure the currents of tank for protection, feedback control, synchronous drive, etc. However, CTs may generate large power losses when measuring currents, which makes it difficult miniaturize. This letter proposed an alternative isolated sensing method. The method uses a transformer and resistor compensate capacitor obtain flowing through capacitor. Compared with CTs, can be much smaller more efficient,...

This letter proposed a novel high-current planar inductor with cooling fins based on 3-D printing and its copper winding is printed by using selective laser melting technology. The 3-D-printed designed for applications space can work as both fins. Compared conventional circuit board (PCB) inductor, the not only has better performance, such low dc resistance (DCR), ac resistance, temperature rise, without volume increasing, but also superiorities of PCB magnetics, ease manufacture...

In this paper, a high frequency wide voltage range CLLC resonant converter is designed. The side 400V, while the low 35-50V. By utilization of Gallium Nitride (GAN) device and optimization circuit, set as 500kHz, power density reaches 4.1 W/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> , maximum efficiency 96.24%. Meanwhile, to further widen converter. hybrid modulation method which combined phase shift proposed. It helps tank...

In this paper, the existence and propagation characteristics of Rossby waves in a two-layer cylindrical fluid are studied. Firstly, based on dimensionless baroclinic quasi-geostrophic vortex equations including exogenous dissipative, we derive new (2+1)-dimensional coupled Boussinesq describing wave polar coordinates by employing multiscale analysis perturbation method. Then, Lie symmetries conservation laws analyzed. Subsequently, using -expansion method, exact solutions obtained. Finally,...

The modeling and optimization of copper losses are the basis magnetic designs. By solving 2-D diffusion Laplace equations, this article proposes a analytical loss model for printed circuit board inductors transformers with arbitrary air gaps. resistance is decoupled into skin, proximity, fringing resistances. caused by inhomogeneity induction expressed as Fourier series. Based on proposed model, some conclusions derived theoretically. For example, independent arrangements primary secondary...

With the increase of frequency, winding loss planar transformers rises significantly due to skin and proximity effects, making it one major contributors converter loss. Paralleling layers is commonly adopted in high-current applications reduce However, most widely used structure, symmetric interleaving, not minimum-loss structure according Ferreira's model, even though can achieve current sharing. In this article, a new interleaving named circulated proposed. This invented based on...

With the development of theory and advancement scientific research, fractional calculus has begun to be considered as a method for study physical systems. In this work, based on basic system equations internal solitary waves, we have derived two-dimensional Benjamin–Ono equation. Then, integer-order equation is transformed into time-fractional To properties algebraic discuss conservation laws new model. Also, using Hirota bilinear method, model solved. Finally, explore characteristics motion...

In the paper, beginning from quasi-geostrophic potential vorticity equation with dissipation and thermal forcing in stratified fluid, by employing multi-scale analysis perturbation method, we derive a forced 3-D Zakharov Kuznetsor (ZK)-Burgers describe propagation of Rossby solitary waves within fractional derivative. The exact solutions are given virtue (G?/G)-expansion method to analyze excitation effect on waves.

Nowadays, Planar magnetics are being widely used in industry due to its low profile, machine manufacturing accessibility, controllability, and reduction AC winding loss. There many ways manufacture planar magnetics, including printed circuit boards (PCB), thick film, folded copper, etc. However, all the above technologies limited on two-dimensional (2D) plane. This paper proposed a multi-function inductor based 3D printing, which has high efficiency reliability. The copper of is manufactured...

The more electric aircraft (MEA) and all (AEA) concept has become a potential solution for fuel consumption greenhouse gas emission problems caused by aircraft. power supply is very important component AEA MEA. Power supplies application are always required high-power-density reliability. This paper designs DC supply, which strong short circuit protection capability. A weight minimization parameters design method LLC presented to optimize the weight. process mentioned in this includes two...