Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"resonant circuit"”.
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Quantitative capacitance measurements using a scanning probe microscope
… to deduce sample capacitances is based on resonant frequency shifting, which relies on the SCM's ultra-precise capacitance sensor. The technique, however, is distinct from scanning capacitance microscopy imaging, with the MOS capacitor an integral part of the system resonant circuit. SPICE …
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Comparison of PWM and resonant technologies in a high voltage DC application
… contain undesirable parasitic reactances. A resonant circuit formed by the leakage inductance and parasitic reflected capacitance, makes various resonant technologies practical for high voltage dc applications. The components of a typical high voltage power stage will be investigated in order …
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Design of a Very High Frequency dc-dc boost converter
… perennial concern in power conversion. With new circuit architectures operating at extreme high frequencies it becomes possible to miniaturize the passive components needed for a power converter, and to achieve dramatic improvements in converter transient performance. This thesis focuses on the …
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Resonant readout of a superconducting persistent current qubit
… decoherence, this thesis work focuses on a resonant readout scheme developed for a niobium persistent-current (PC) qubit. This non-dissipative readout approach detects the flux state of the qubit by sensing a change in the Josephson inductance of a SQUID magnetometer. By incorporating the …
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A zero voltage switching boost converter using a soft switching auxiliary circuit with reduced conduction losses
… such solution. In such a converter an auxiliary resonant circuit is employed which is activated only when the boost switch is turning on or off. This auxiliary circuit allows the boost switch to turn on and off under zero voltage conditions thus reducing the switching losses. However the …
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Design a filter for harmonics caused by non-linear load and resonance coused by power factor correction capacitor
… capacitive impedance of the PFCC may form a resonant circuit with the source inductive reactance at a certain frequency, which is likely to coincide with one of the harmonic frequency of the load. This condition will trigger large oscillatory currents and voltages that may stress the …
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Gamma frequency entrainment attenuates amyloid load and modifies microglia
… in many brain regions, are generated by a resonant circuit between fast-spiking (FS)-parvalbumin (PV)-interneurons and pyramidal cells. Changes in gamma oscillations have been observed in several neurological disorders. However, the relationship between gamma oscillations and cellular …
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Structural Wireless Delamination Sensor
… Interlaminar Nano Sensor, or WINS) is an LC resonant circuit (resonant frequency fₛ = 1 MHz), and unlike prior sensors, is comprised solely of structural materials: a structural epoxy and carbon nanotubes (CNTs). The delamination crack causes a change in capacitance of the sensor leading to a …
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Design of dual-input two phase dc/dc converter with modified pulse width modulation (mpwm)
… the switching loss. The proposed converter circuit is simulated by using MATLAB/Simulink and PSpice software programs. The duty cycle employed to regulate output voltage is reached from Altera DE2-70 board through dSPACE DS1103 board using by Proportional-Integral (PI) controller. The …
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Bi-Directional AC-DC Converters for Electric Vehicles
… free from low frequency ripple. The innovative resonant control schemes enable the proposed topologies to successfully perform complicated tasks of optimization, power transfer, cancellation of low frequency current ripple on the battery-side and maintaining ZVS for all the switching instants. …
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A vector based approach for high frequency prospective correction of rigid body motion in Magnetic Resonance Imaging (MRI)
… pulses in the imaging sequence with a small resonant circuit. This combined with a 2.4 GHz radio link enabled the probe to be wireless. Finally, the pickup coil observations were combined with the vector based orientation estimates and the gradient field model to achieve efficient …
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Design and implementation of a universal onboard battery fast charger for transportation electrification applications
… of converter further, a simple auxiliary resonant circuit has been implemented to most operated boost switch. This auxiliary circuit provides the zero voltage transition (ZVT) and zero current transition (ZCT) of the boost switch and the remaining components are also soft switched. The …
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Simultaneous Power and Signal Transfer via Capacitive Coupling
… is applied on top of an autonomous push-pull resonant converter (PPRC). As the loading conditions change, the operating frequency of the PPRC drifts. This unique feature makes the communication possible even through lossy dielectric materials. A prototype is built and data transfer from a …
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An Isolated Micro-Converter for Next-Generation Photovoltaic Infrastructure
… a new dc-dc topology, the Integrated Boost Resonant (IBR) converter, born out of the natural design requirements for the micro-converter, such as high CEC efficiency, simple structure, and inherent Galvanic isolation. The circuit is a combination of a traditional PWM boost converter and a …
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Analysis and Design of a DCM SEPIC PFC with Adjustable Output Voltage
… is aggravated especially in systems where resonant converters are selected as second stage. Especially for domestic induction cooker application, step-down PFC with wide range output regulation capability would be a reasonable solution, Conventional induction cooker is composed by input …
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Dvoukanálový devítipásmový ekvalizér
Ciežom bakalárskej práce je zoznámenie sa s úpravou audio signálu s kmitočtovými výhybkami a návrhom deväťpásmového ekvalizéra. Následne po navrhnutí ekvalizéra bolo nutné ho odsimulovať v programe PSpice. V programe Eagle navrhnúť dosku plošného spoja a ekvalizér prakticky realizovať a to vrátane …
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Entwicklung und Charakterisierung von mikrostrukturierten Planarspulen für Kernspinresonanz-Anwendungen
… radio frequency coil, gradient coils, a matching circuit for the use with conventional spectrometers and a 0.4-T permanent magnet. This device can be approached indefinitely close to the specimen. The less than 50 µm thin planar coils consist of two polyimide layers and two gold layers. The coils …