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 84 for “"Peak current"”.
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Peak Current Mode Driver for Thermoelectric Cooler
… In order to both heat and cool, a bidirectional current must be supplied to the TEC. Therefore, a driver circuit is needed to supply the TEC with this bidirectional input. This thesis explores a design for an ultra-compact driver for a TEC that allows the system to quickly respond to …
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Input-Pattern-Independent Estimation of Peak Current, Peak Power Dissipation, and Maximum Voltage Variation in the Power Distribution Network of VLSI Circuits
… the computation of maximum switching activity, peak current for programmable logic arrays (PLAs), peak current envelope for static circuits, maximum leakage current, and the maximum voltage variation in the power distribution network. Comparisons with the results obtained by exhaustive …
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Electrochemical Studies of The Interaction Between DNA and a Compound Having Anticancer Properties.
… Our results showed an increase in the adsorption peak current and a negative shift of E<sub>1/2</sub> in the oxidation of ferrocyanide on cysteamine and DNA modified electrodes. For the interaction between the DNA and the compound having anticancer properties, a decrease in peak current of the …
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Optically triggered thyristor for capacitor discharge applications
… with 522 V blocking voltage, 4.06 kA peak current and di/dt of 266.22 kA/ [mu]s and another one with 274.5 V blocking voltage, 3.94 kA peak current and di/dt of 664 kA/[mu]s. Both of these devices were in a realistic capacitor discharge circuit.
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Bottom-Up High -Level Power Modeling and Estimation
… every input vector pair (energy per cycle) and peak-current for every input vector pair (peak current per cycle), for different logic styles. Another contribution of this research is automatic developments of these macromodels based on recursive least squares (RLS) algorithm. Due to simplicity …
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Bottom-Up High -Level Current Macro-Models for Logic Blocks
… power-grid design and analysis requires a current macro-model for different logic blocks that are both easy to use and automatically constructed. The main contribution of this research is the development of current macro-models for combinational logic blocks in the frequency domain. The …
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Barrel wear reduction in rail guns : an investigation of silver paste liquid-metal interface
… rail test section at 34 Å 19 m/s, while average current densities of 18-32 kA/cm2 was passed through the projectile - rail interface material. The specific objective is to examine rail and projectile damage at current densities near or above those (" 25kA/cm2) anticipated for a naval rail gun. …
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Simulating artificial lightning and composite damage
… gas) and has been idealised into four electric current waveforms of varying current and duration. Authors have almost exclusively modelled just one of the key lightning physics (plasma, thermal-electric, pressure or thermal-expansion), ignoring some important physical phenomena such as strain …
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Micro- and nano-electrode arrays for electroanalytical sensing
… recorded from the array became increasingly peak-shaped, due to merging of the diffusion fields of the individual electrodes. Furthermore, it was shown that the peak current densities obtained were largest for the arrays with the smallest individual electrodes, as were the signal-to-noise …
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Study of Semiconducting Nanomaterials: Photoelectrochemistry and Dynamic Light Scattering
… tin oxide microelectrodes (FTO µE). We observed peak current transients with magnitudes of a few nA to 100 nA. The variation in the peak current magnitude is attributed to the detection of single NPs and of agglomerates of 100 nm to 1-2 µm diameter as supported by DLS measurements. Interestingly, …
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High performance control of VRM circuits
… because of its ability to handle large load current and to achieve fast dynamic transient response under large step-load condition.The first part of this thesis fully investigates this issue for three popular control schemes used currently: Voltage Mode Control (VMC), Average Current Mode …
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Characterization and modeling of ESD events, risk and protection
… constructed to investigate the spark length and current derivatives and to understand the ESD spark behavior for geometries having spark lengths longer than the values predicted by Paschen’s law.</p><p>For the wearable devices, the core difference between the posture assumed for IEC 61000-4-2 …
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Continuous-Time Delta-Sigma Modulators for Ultra-Low-Power Radios
… sensitivity of the CT DSM while keeping the DAC peak current lower than for conventional SCR feedback. A lower peak current translates into more relaxed slew-rate requirements on the first operational amplifier and thereby less power consumption. Papers III and IV present a low power 2nd-order CT …
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Design of a step-down DC-DC controller integrated circuit with adaptive dead-time control
A constant-frequency peak current mode synchronous step-down DC-DC controller integrated circuit has been designed with adaptive dead-time control. The adaptive dead-time control circuitry is implemented as digital delay-locked loop with digital counters as memory elements. In periodic steady …
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Adaptive defibrillator design
… is usually achieved by passing an electrical current pulse transthoracically through the heart of the patient. The source of this electrical current is usually a high voltage capacitor. The successful operation of defibrillators depends on two parameters, Transthoracic Resistance (TTR) and the …
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System Design Considerations and the Feasibility of Passively Compensated, Permanent Magnet, Iron-Core Compulsators to Power Small Railgun Platforms
… pulse length, but resulted in lower values for peak current and projectile velocity by 50% and 30% respectively when compared to published data.</p>
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Effects of chromium powder mixed in electrical discharge machining of AISI D2 hardened steels
… design of three factors at a time consisted of peak current (Ip), pulse-on (Pon) and powder concentration(C). Discussions were made on the responses such as MRR, EWR, Surface Roughness (Ra), surface morphology, recast layer (RL) and microhardness (MH) on the selected samples from the same …
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Development of a laboratory course in power electronic control circuitry based on a PWM buck controller
… an introduction to Integrated Circuit design. A peak current mode PWM controller for a buck converter is developed to illustrate the fundamental power electronic and analog circuit concepts that are presented.
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Control And Topology Improvements In Half-bridge Dc-dc Converters
… employs two MOSFETs to freewheeling the leakage current when the main MOSFETs of the half-bridge are both off. Driving voltage variation on the secondary side Synchronous Rectifier (SR) MOSFETs in self-driven circuit due to input voltage variation in bus converter applications is also …
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