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 15 of 15 for “"switching cycle"”.
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Switching-Cycle Control and Sensing Techniques for High-Density SiC-Based Modular Converters
… by introducing a proposed state-space switching model, followed by unveiling all possible operation scenarios of the MMC. The lower-frequency energy fluctuation on passive components of the MMC is interpreted and prior-art approaches to overcome it are presented. By scrutinizing the …
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Preparation of CO2-Switchable Poly(Methyl Methacrylate) Latexes by Surfactant-Free Emulsion Polymerization
… DMAEMA partitioning into the water phase. Two switching on/off cycles were conducted to the latex obtained from the surfactant-free emulsion polymerization. The first switching-off cycle was carried out by NaOH neutralization, followed by simple CO2 purging for redispersion. Full recovery of …
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Multi-Branch Current Sensing Based Single Current Sensor Technique for Power Electronic Converters
… measured several times in a single switching cycle by using a single current sensor. After that, the current reconstruction algorithm is applied to obtain all phase currents information. Compared to traditional single current sensor techniques (SCSTs), the proposed method samples the …
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Output Capacitance Loss Measurement and Validation for Low-Voltage Silicon and GaN Devices in DC-DC Converter Applications
… converter topologies can help achieve loss-less switching in a power device. However, this theory is not completely true as there even with soft-switching there is some degree of loss associated in the form of output capacitance-related hysteresis loss, channel turn-off loss, and loss during the …
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Study on Three-level DC/DC Converter with Coupled Inductors
… of multiple equivalent inductances during one switching cycle. A combination of them determines the inductor current ripple and dynamics of the system. By virtue of inverse coupling and means of controlling the coupling coefficients, one can minimize the current ripple and the unwanted …
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Frequency Domain Conductive Electromagnetic Interference Modeling and Prediction with Parasitics Extraction for Inverters
… double Fourier integral technique because its switching cycle and the fundamental cycle are in two different time scales. The noise path requires parasitic parameter extraction through finite element analysis for complex-structured power bus bar and printed circuit layout. After inverter noise …
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Design and Testing of a SiC-based Solid-State Bypass Switch for 1 kV Power Electronics Building Blocks
… output performance, and low voltage ratings for switching devices. However, without the excellent reliability of the MMC, applications cannot reap these benefits. The MMC topology comprises several series-connected submodules (typically a half-bridge or a full-bridge inverter). As a result of …
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Modeling and Design of a Monolithic High Frequency Synchronous Buck with Fast Transient Response
… monolithic integration. Comparing with discrete switching DC-DC converter, monolithic integration brings a number of benefits and new design challenges. Besides monolithic integration, high switching frequency is another trend for power management ICs due to its higher bandwidth and the ability …
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Modeling and design of digital current-mode constant on-time control
… voltage regulator module. One issue is the limit cycle oscillation problem caused by the quantization effect from the ADC and DPWM of the digital control chip. Another issue is the delay problem coming from the sample-hold effect. In this thesis, the modeling, analysis and design methodology for …
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Synchronized Communication Network for Real-Time Distributed Control Systems in Modular Power Converters
… arm current shaping in the timescale of a switching period, referred as the switching-cycle control (SCC), such line-frequency dependence can be eliminated and MMCs are enabled to work even in dc-dc mode. Yet the SCC demands multiple times of arm current alternations in one switching …
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Enhanced Gate-Driver Techniques and SiC-based Power-cell Design and Assessment for Medium-Voltage Applications
… semiconductors exhibit superiority in terms of switching speed, higher breakdown electric field, and high working temperature, slowly becoming a global solution in harsh medium-voltage (MV) high-power environments. However, to utilize the SiC MOSFET device to achieve those next-generation, …
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Impact of Inert-electrode on the Performance and Electro-thermal Reliability of ReRAM Memory Array
… type of non-volatile memories, such as resistive switching memories, have lately found increased attention by both industry and academia. Resistive switching memory (ReRAM) is being considered one of the prime candidates for next-generation non-volatile memory due to relatively high switching …
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A High-Efficiency Hybrid Resonant Microconverter for Photovoltaic Generation Systems
… through low circulating currents, zero-current switching (ZCS) of the output diodes, zero-voltage switching (ZVS) and/or ZCS of the primary side active switches, and direct power transfer from the source to the load for the majority of the switching cycle. Each operating mode is analyzed in …
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Improved Forward Topologies for DC-DC applications with Built-in Input Filter
… the flux can be fully reset by the end of each switching cycle to prevent core saturation. Also, due to the utilization of a transformer, leakage inductances cannot be avoided. The energy stored in the leakage inductance during current ramp-up is not transferred to the load, and is not recovered …
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Theoretical Analysis and Design for the Series-Resonator Buck Converter
… the current between the two phases. Hard switching has hindered efforts to reduce volume via increased switching frequency, although a monolithically integrated SCB converter has boosted current density. A Series-Resonator Buck (SRB) converter is realized by adding a resonant tank in …