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 48 for “"Current Ripple"”.
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A Modified Boost Converter with Reduced Input Current Ripple
… DC/DC converter. Reducing a converter’s input ripple helps prevent switching noise from spreading to other systems on a shared DC power bus. This thesis covers the analysis, simulation, and implementation of a recently-proposed boost converter topology, alongside an equivalent standard boost …
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A Soft-Switched Grid-Connected DC/AC Inverter with Low Current Ripple
… low power applications (i.e., high voltage, low current applications). The proposed circuit is based on the conventional full-bridge structure in conjunction with integrated magnetics. The integrated magnetics performs the ripple steering to provide zero voltage switching for the power …
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A Modified Multiphase Boost Converter with Reduced Input Current Ripple: Split Inductance and Capacitance Configuration
… circuits or impede their operation. High ripple current degrades battery lifetime and reduces operating efficiency in connected systems such as PV arrays. Converters with high ripple current also experience greater peak conduction loss and require larger components. A two-phase …
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Control of Pseudo-Sinusoidal Switched Reluctance Motor with Zero Torque Ripple and Damped Input Current Ripple
… advantage and ruggedness. However, the torque ripple and bus current ripple of SRM restrict its application range compared with traditional AC and DC motors due to the doubly salient pole structure and the highly non-linear coupling between torque, rotor position and phase current. As a result …
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Study on Three-level DC/DC Converter with Coupled Inductors
… phased legs offer the benefit of output current ripple reduction, while inversed coupled inductors can suppress the circulating current between phase legs. Compared with conventional non-interleaving three-level DC/DC converter with non-coupling inductors, both inductor current ripple and …
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Asymmetric interleaving in low-voltage CMOS power management with multiple supply rails
… interleaving as a method of reducing the input current ripple for the power converter. Asymmetric interleaving is a method of control that allows for a further reduction, and in some cases complete cancellation, of this input current ripple. This work looks at some of the challenges for a …
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A low ripple bi-directional battery charger/discharger using coupled inductor
… about a spacecraft power conversion system: low ripple current flowing through both battery and bus, and bi-directional power flow to and from the battery. This thesis introduces a novel low ripple current bi-directional battery charge/discharge converter using coupled-inductor. Bi-directional …
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Modified Control for Single-Phase Fuel Cell Systems with Input Ripple Compensation and Improved Output Quality
… introduces a second harmonic component in the current drawn from the fuel cell source. This low-frequency current ripple has been found to be detrimental to the performance, lifespan, and efficiency of the fuel cell, if not adequately controlled. This thesis presents a current control method …
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Design and development of exclusive modulation techniques for effective power regulation in dual two-level-inverter-fed open-ended winding traction motors
… battery sources. In the second work, an output current ripple analysis is provided for the dual two-level inverter for varied power sharing ratio. This work demonstrates that the ripple in motor phase current changes when the power sharing in dual two-level inverter is changed. Current error …
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The Modified-Multiphase Boost Converter: Combined Inductors and Capacitors Topology
… already been proven to drastically reduce input current ripple by about 40% in a single-phase implementation. By placing two modified boost converters in parallel with interleaving main switches (multiphase), the input inductors and modified capacitors of the modified topology can be reduced to …
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Improved Forward Topologies for DC-DC applications with Built-in Input Filter
… leakage inductance, and the pulsating input current waveform. The transformer is driven in a unidirectional fashion in the forward converter; a tertiary forward converter (TFC) is an example of this. Therefore, the third winding and reset diode must be provided with an adequate period of …
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Analysis, design, and evaluation of the optimum topology Cuk converter in comparison with the conventional Buck-Boost converter
… converter under both the balanced and unbalanced current ripple reduction modes of operation is made. From this comparison, it is shown that the unbalanced current ripple reduction is more advantageous. The effects of using different input voltages and different core materials with different …
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High Power High Frequency 3-level NPC Power Conversion System
… analysis for loss and neutral voltage ripple tradeoff. An improved SVM method is proposed to reduce NP imbalance and switching loss simultaneously. This method also ensures an evenly distributed device loss in each phase leg and gives a constant system efficiency under different power …
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Design and analysis of an active power factor correction circuit
… Design equations relating the boost inductor current ripple to the circuit components selection and circuit performance arc discussed. A computer-aided design program (CADO) is developed to give the optimal circuit components selection. A 500 watt, 300 volt experimental circuit is built to …
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Single-stage boost integrated asymmetrical half-bridge AC-DC power converter with dual modulation for indoor led lighting
… improving power factor and regulating the output current ripple with regards to LED drivers has been addressed in this thesis by using dual modulation in a single stage AC/DC power converter. The dual modulation has been achieved through novel controls schemes. Various decoupling control …
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Current source dc-dc and dc-ac converters with continuous energy flow
This work considers current sourced power electronic converters. The thesis classifies and presents several new single-phase and three-phase differential-mode current source inverters that evolve from the basic dc-dc converter topologies. The switched, large-signal, and small-signal models of these …
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Control of a High-speed (<50,000 rpm) Interior Permanent Magnet Synchronous Motor
… core loss resistance with respect to the d-axis current. Analytical and experimental validation on a HS-IPMSM (5kW, 50,000 rpm) demonstrate that these methods effectively reduce electrical losses. Additionally, a hybrid trajectory combining MTPA and LMC is developed to balance efficiency and …
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Implementation and control of distributed maximum power point tracking in solar photovoltaic applications
… systems by optimizing their operating point. Current state-of-the-art solutions perform MPPT for a whole system, a string of panels or an individual panel within a PV system. This results in a loss of energy when the optimal operating point varies among different units. In this thesis, the …
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Modelling and optimisation of the dynamic performance of a reversible solid oxide fuel cell system for the grid intergration of renewables
… certain grid scenarios due to excess fuel cell current ripples. Simulations show that appropriate DC bus capacitors effectively reduce the ratio of fuel cell current ripple although potential system cost is implied. Finally it is found that the state of charge (SOC) can in fact have a more …
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Integrated magnetic components for high-power high-current dc-dc converters
… (IM) structure for use in high-power high-current power converters employed in renewable energy applications. These applications require low-cost, high efficiency and high-power density magnetic components and the use of IM structures can help achieve this goal. A novel CCTT-core …
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