In this article, the four-switch buck–boost (FSBB) converter is a preferred choice for dc–dc applications where step-up and step-down are needed. order to reduce inductor size improve efficiency, zero-voltage switch (ZVS) control schemes with four segments current FSBB have been investigated in numerous publications. Among these ZVS schemes, optimized variable stored as huge look-up table data achieved minimum root-mean-square (RMS) current, complex real-time calculation avoided. However,...

In traditional inductor design with planar windings, the magnetic field distribution may not be well-organized, leading to significant winding loss, particularly at high switching frequencies. This study explores relationship between current and in region. Unlike conventional flux distribution, which directs a large portion of vertically through windings region, this work introduces structure that maintains most parallel foil application quasi-distributed air gaps. paper presents methodology...

The resonant dc–dc converter is preferred for high-efficiency applications due to its less switching loss and better electromagnetic interference (EMI) characteristics. However, in a wide range of steady-state voltage gain applications, such as the on-board charger application, output will lead bulky inductor, which decrease power density. Magnetic integration inductor transformer an effective way reduce total magnetic volume. traditional integrated magnetics result high field intensity...

A resonant four-switch inverting buck–boost converter is a good choice for dc/dc applications that require an voltage solution. soft-switching control scheme with four segments of resonance current has been examined using duty ratio and phase shift as variables. As result, the rms value low compared discontinues mode (DCM), which directly proportional to conduction loss. This allows regulate its output voltages more efficiently operations. Thus, it contributes increment in efficiency...

For transformer structure that use litz-wire as the primary winding and printed circuit board (PCB) secondary winding, common-mode (CM) noise is quite severe due to large equivalent inter-winding capacitance. In order reduce CM in this specific structure, a shielding method proposed paper. Compared with conventional methods, one turn of replaced by foil no more layer needed. Moreover, changing air gap position two methods based on magnetic core are adopted suppress caused leakage flux. The...

In the DC-DC stage of On-Board-Charger (OBC), volume transformer and AC side inductor can occupy more than 1/4 total volume, which becomes a key restriction to improvement power density. Magnetics with split-windings structure construct enough leakage inductance achieve integration thus reduce magnetics dramatically. However, when referred core size design, only transformer's flux density is taken into account determine cross-section area in existing papers. On condition that parasitic large...

Magnetic integration effectively reduces the total magnetic volume for a converter with multiple components. However, existing integrated inductor and transformer still face some problems, such as large core cross-sectional area due to small effective winding number or low printed-circuits-board (PCB) utilization unreasonable structure design. A new (IM) high PCB resonant is proposed in this article. The constructed by both primary secondary side windings, which increases not only turn but...

A simple current-feed single-switch forward resonant converter with secondary diode-clamping is proposed for low power high-density bus applications in this paper. The quasi-zero-voltage-switching (ZVS) turn on and quasi-zero-current-switching (ZCS) off switch are both achieved. Due to the quasi-ZCS off, high voltage spike traditional single a reset winding much reduced. small diode connecting output capacitor utilized clamp stress of switches. operating principle analyzed MHz 66W 24V-to-12V...

Electromagnetic ultrasonic transducers (EMATs) phased arrays technology is helpful to improve the sensitivity and efficiency of defect detection, performance can be evaluated by directivity steering beam. The affected transducer parameters such as number elements, element width, inter-element spacing. Therefore, effects on characteristics shear vertical (SV) wave EAMT are studied. It learned that pressure along direction increases dramatically main lobe width gets narrower elements...

Lung cancer associated with cystic airspaces (LCCA) is a type of lung characterized by the presence cavities in or around tumor on imaging. Due to its high potential for misdiagnosis underdiagnosis, prognosis LCCA patients poor, necessitating further large-scale clinical studies elucidate characteristics. Currently, four imaging classification systems exist, and there has been progressive increase attention towards LCCA, particularly regard study features. The results indicate correlation...

In recent years, gallium nitride (GaN) high electron mobility transistors (HEMTs) has been widely adopted in fast chargers, showcasing their potential promoting efficiency and power density. However, as level increases, especially beyond 10 kW, it becomes crucial to address not only parasitic inductances but also the thermal performance seriously. this work, a GaN integrated module (IPM) with ultra-low resistance is presented. To minimize inductances, 6-layer printed circuit board (PCB)...

An improved Buck ac/dc topology has been presented to improve the power factor and reduce harmonics of conventional converter for high-power non-isolated LED driver. In this paper, more detailed operating principle design methodology ac-dc driver are discussed. A 150 W prototype shows that input current meet lighting standard THD is less than 20% at 75W~150W output. And, peak efficiency higher 96.5% full load normal input.

Magnetic integration effectively reduces the total magnetic volume for a converter with multiple components. However, existing solutions still face some problems, such as large core cross-sectional area due to small effective inductor winding number or low PCB utilization unreasonable structure design. This paper proposed an integrated resonant and transformer volume. By proper arrangement, is constructed by both side of windings, which not only increases but also improves PCB. What more,...

An eight-channel electromagnetic acoustic transducer (EMAT) phased array detection system is designed and a scanning imaging for defect in an aluminum plate obtained using this system. Hand-wound racetrack coils with many turns instead of PCB single turn applied to design the coil structure EMATs, two structures are designed. According simulation results, sound pressure final EMATs doubled. A transmitting circuit high power delay precision receiving gain low noise Experiments completed...

Electromagnetic acoustic transducer (EMAT) phased arrays consist of multiple independent elements. The steering and focusing the beam can be achieved by individually controlling time delay each element. diameter focal spot pressure distribution direction play an important role in determining performance focusing. would change into that when distance length is large enough. By comparing radiation patterns various lengths near field, it learned a short beneficial to energy concentration...

The trend toward high efficiency and power density for converters will continue. Magnetics integration can reduce the total volume of magnetics, helping to achieve density. integrated magnetics (IM) with asymmetrical windings magnetic while keeping low winding loss simultaneously. However, conventional design needs a huge cross-sectional area due small effective resonant inductor numbers when large inductance is needed. In order compact design, this paper gives methodology wide range values....