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 20 of 58 for “"current sensing"”.
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On-chip current sensing for monolithic buck LED driver
… and analyzes two different options for on-chip sensing and regulating current for a buck LED driver, as compared to a common external solution. With the rise of LED use in common lighting applications, it becomes increasingly necessary to develop solutions that are simple to use and accurate. In …
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Using current sensing atomic force microscopy to study heterogeneous materials
… films and Nafion membranes, are studied by using current sensing atomic force microscopy (CSAFM). In the calculated results, correlation between surface morphology and surface conductance images is obtained using CSAFM, and the implication of the surface conductance and its variations is analyzed. …
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Control and current sensing systems for the parallel resonant pole inverter architecture
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Multi-Branch Current Sensing Based Single Current Sensor Technique for Power Electronic Converters
A new concept of current sensor reduction technique called multi-branch current sensing technique (MCST) is proposed in this dissertation. In the proposed current sensing method, one more branch currents are simultaneously measured several times in a single switching cycle by using a single current …
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A silicon current sensing amplifier and organic imager for an optical feedback OLED display
… to build thin, flexible cost effective displays. Currently, the primary drawback to their usage lies in the difficulty of producing OLEDs that emit light at a constant and predictable brightness over their lifetime. This leads to a non-uniform brightness and a limited effective lifetime in an OLED …
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Microstructural Modification in Nanocrystalline Silicon Due to Selective Charge Injection: A Current-sensing Atomic Force Microscopy Study
… using contact-mode atomic force microscopy and current sensing AFM (CSAFM). Changes in average height and average conductivity were observed that were directly proportional to the magnitude of the bias</p> <p>voltage at which charge was injected. The highest bias voltage (+10 V) caused the …
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Single Phase Power Factor Correction Circuit with Wide Output Voltage Range
… circuit is analyzed and designed. Charge average current sensing scheme has been adopted to sense the input current. The problem of high input harmonic currents at low output voltage is discussed. It is found that the current loop gain and cross over frequency will change greatly when the output …
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A Wide-Bandwidth Galvanically Isolated Current Sensor with Frequency Modulation
Highly-integrated galvanically isolated current sensing solutions are required to satisfy the demands arising from recent developments in areas such as electric vehicles, smart homes and industrial electronics. These sensors must also be able to provide measurements for wide bandwidths and with …
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Integrated Current Sensor using Giant Magneto Resistive (GMR) Field Detector for Planar Power Module
… power modules have limited application for high-current operation, mainly because of their poor thermal management capability. Planar power modules have excellent thermal management capability and lower parasitic inductance, which means that the planar packaging method is desirable for high-power …
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Fully Distributed Control and Its Analog IC Design For Scalable Multiphase Voltage Regulators
… low supply voltage (about 1V), but very high current (maximum current is 300A in servers, 100A in desktop PCs and 70A in notebook PCs), and tighter voltage regulation. However, the size of a CPU Voltage Regulator (VR) needs to be reduced. To achieve much higher power density with decent …
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Advanced Control Schemes for High-Bandwidth Multiphase Voltage Regulators
… it is found that the stability margin of current-mode control in high-BW design is very sensitive to operating conditions and component tolerance, depending on the performance of the current-sensing techniques, modulation schemes, and interleaving approaches. The primary objective of this …
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Design And Characterization Of An Embedded Amperometric Analyzer For Field-Portable Electrochemical Applications
… electrode (RE), while measuring the redox current response at the auxillary electrode (AE) using a low-side resistive sensing mechanism. In an unstirred solution, at steady state, the rate of electron transfer is directly proportional to the concentration of the reactant. Therefore, the …
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Investigation of Multiphase Coupled-Inductor Buck Converters in Point-of-Load Applications
… structures with the good performance, the current sensing of converter and the light-load efficiency improvement. They are investigated in this dissertation. The comprehensive analysis of the multiphase coupled-inductor buck converter is investigated. The n-phase (n>2) coupled-inductor buck …
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A wide-dynamic-range time-based CMOS imager
… describes a novel dual-threshold time-based current sensing algorithm suitable for use in wide-dynamic-range CMOS imagers. A prototype 150 x 256 pixel imager employing this algorithm experimentally achieves 95.5 dB dynamic range, 37 dB peak signal-to-noise ratio (SNR), and a highly-linear …
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DC-DC converters with high efficiency over wide load ranges
… to 500mW. Specifically, depending on the load current, the regulator automatically switches between Pulse Frequency Modulation (PPM) and Pulse Width Modulation (PWM), and also automatically selects the optimum switching MOSFET. The current sensing is done without an additional current sense …
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Nonlinear control and operation of DC to DC switching power converters
… A nonlinear control scheme called sensorless current mode (SCM) control has been developed that emulates current mode control without current sensing. SCM has very significant advantages in dynamic range and noise susceptibility. Optimal control approaches to switching power conversion has …
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Design of feedforward active ripple filters for power converters
… circuit which cancels or suppresses the ripple current and EMI generated by the power stage of a power converter, thus reducing the passive filtration requirements. This thesis presents the design and evaluation of various current sensing and injection methods for feedforward active filter …
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Battery Cell Monitoring Unit
The proposed cell monitoring unit for sensing voltage, current, and temperature in a 12-cell 18650 lithium-ion battery module aims to be low-power, serving as the core of an energy-efficient battery management system and facilitating battery management functions with cell data. Notable features …
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Modeling and Design of a Monolithic High Frequency Synchronous Buck with Fast Transient Response
… which means that compensator, ramp compensation, current sensor, driver and even power devices should be all implemented on a single chip, i.e. monolithic integration. Comparing with discrete switching DC-DC converter, monolithic integration brings a number of benefits and new design challenges. …
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Towards basin-scale in-situ characterization of sea-ice using an Autonomous Underwater Glider
… This is possible by employing onboard acoustic sensing for sea-ice observation and navigation, along with intelligent management of onboard resources. To enable unattended survey of Arctic sea-ice with an AUG, this thesis proposes a hierarchical acoustics-based sea-ice characterization scheme to …
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