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A SINGLE-PHASE DUAL-OUTPUT AC-DC CONVERTER WITH HIGH QUALITY INPUT WAVEFORMSLI, QIANG 01 January 2003 (has links)
A single-phase, buck-boost based, dual-output AC-DC converter is studied in this thesis. The converter has two DC outputs with opposite polarities, which share the same ground with the input power line. The power stage performance, including the input filter, is studied and procedure to select power components is given. The circuit model is analyzed to develop appropriate control. Zerocrossing distortion of the source input current is addressed and a solution is proposed. Experimental results are satisfactory in that a high power factor line current results for steady-state operation.
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Multi-Input Single-Inductor MPPT Regulator with Sliding-Mode ControllerJanuary 2017 (has links)
abstract: A Multi-input single inductor dual-output Boost based architecture for Multi-junction PV energy harvesting source is presented. The system works in Discontinuous Conduction Mode to achieve the independent input regulation for multi-junction PV source. A dual-output path is implemented to regulate the output at 3V as well as store the extra energy at light load condition. The dual-loop based sliding-mode MPPT for multi-junction PV is proposed to speed up the system response time for prompt irradiation change as well as maximize MPPT efficiency. The whole system achieves peak efficiency of 83% and MPPT efficiency of 95%. The whole system is designed, simulated in Cadence and implemented in PCB platform. / Dissertation/Thesis / Masters Thesis Electrical Engineering 2017
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Vibration Energy Harvesting IC Design with Incorporation of Two Maximum Power Point Tracking MethodsLi, Jiayu 02 June 2020 (has links)
The proposed vibration energy harvesting IC harvests energy from a piezoelectric transducer (PZT) to provide power for a wireless sensor node (WSN). With a traditional rectification stage, a two-path three-switch dual-input dual-output architecture is adopted to extract power and regulate the output voltage for the load with one stage. The power stage is controlled with a new maximum power point tracking (MPPT) algorithm, which integrates both fraction open circuit voltage (FOCV) and perturb and observe (PandO). The proposed algorithm was able to extract maximum power from a transducer due to high accuracy on the maxim power point (MPP) and low power dissipation.
The proposed circuit is implemented in TSMC 180 nm BCD technology and the post-layout simulation verifies the functionality of the proposed design. The simulation results show that the circuit operates under the maximum power point to extract maximum power from a PZT. / Master of Science / The battery life has always been problematic ever since electronic devices exist. As semiconductor technology advances, more transistors could fit in the same area. Resultantly, portable, and mobile devices become more powerful but usually dissipate more power. Unfortunately, the development of the batteries has not been improved significantly. So, it is necessary to charge portable and mobile devices often or replace batteries frequently. In some applications where a device is hard to reach once installed, charging or replacing the battery is difficult. Under these circumstances, energy harvesting from ambient sources is an effective alternative.
There are many types of sources of energy widely available in the environment such as vibration, thermal, solar, RF and etc. Solar energy harvesting is the most popular owing to high power density. However, sunlight is unavailable during night time. Vibration energy, although the power density is lower compared with solar, is a viable solution when solar is not a good source of energy.
The proposed work utilizes abundant vibration energy at factories to power wireless sensor nodes (WSNs), which can monitor the temperature, light intensity, pressure, etc.
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Design of isolated DC-DC and DC-DC-AC converters with reduced number of power switchesMallik, Dhara I. 07 1900 (has links)
Indiana University-Purdue University Indianapolis (IUPUI) / There are various types of power electronic converters available in recent days. In
some applications (e.g. PC power supply), it is required to supply more than one load
from a single power supply. One of the main challenges while designing a power converter
is to increase its e ciency especially when the number of power switches employed is
relatively large. While several loads are supplied from a single source, if the power loss in
the switches cannot be reduced, then the expected utilization of using a single source is not
very feasible. To reduce the loss and increase e ciency, the thesis presents a novel design
with reduced number of switches.
The scope of this thesis is not limited to the dc-dc converter only, the converter to supply
three phase ac loads from a single dc source is also presented. This discussion includes an
improved fault tolerant configuration of the inverter part. The generated waveforms from
the simulations are included as a demonstration of satisfactory results.
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Design and Implementation of Switching Voltage Integrated Circuits Based on Sliding Mode ControlRojas Gonzalez, Miguel Angel 2009 August 1900 (has links)
The need for high performance circuits in systems with low-voltage and low-power
requirements has exponentially increased during the few last years due to the sophistication
and miniaturization of electronic components. Most of these circuits are required to have a
very good efficiency behavior in order to extend the battery life of the device.
This dissertation addresses two important topics concerning very high efficiency
circuits with very high performance specifications. The first topic is the design and
implementation of class D audio power amplifiers, keeping their inherent high efficiency
characteristic while improving their linearity performance, reducing their quiescent power
consumption, and minimizing the silicon area. The second topic is the design and
implementation of switching voltage regulators and their controllers, to provide a low-cost,
compact, high efficient and reliable power conversion for integrated circuits.
The first part of this dissertation includes a short, although deep, analysis on class
D amplifiers, their history, principles of operation, architectures, performance metrics,
practical design considerations, and their present and future market distribution. Moreover,
the harmonic distortion of open-loop class D amplifiers based on pulse-width modulation
(PWM) is analyzed by applying the duty cycle variation technique for the most popular
carrier waveforms giving an easy and practical analytic method to evaluate the class
D amplifier distortion and determine its specifications for a given linearity requirement.
Additionally, three class D amplifiers, with an architecture based on sliding mode control, are proposed, designed, fabricated and tested. The amplifiers make use of a hysteretic
controller to avoid the need of complex overhead circuitry typically needed in other
architectures to compensate non-idealities of practical implementations. The design of the
amplifiers based on this technique is compact, small, reliable, and provides a performance
comparable to the state-of-the-art class D amplifiers, but consumes only one tenth of
quiescent power. This characteristic gives to the proposed amplifiers an advantage for
applications with minimal power consumption and very high performance requirements.
The second part of this dissertation presents the design, implementation, and testing
of switching voltage regulators. It starts with a description and brief analysis on the power
converters architectures. It outlines the advantages and drawbacks of the main topologies,
discusses practical design considerations, and compares their current and future market
distribution. Then, two different buck converters are proposed to overcome the most critical
issue in switching voltage regulators: to provide a stable voltage supply for electronic
devices, with good regulation voltage, high efficiency performance, and, most important,
a minimum number of components. The first buck converter, which has been designed,
fabricated and tested, is an integrated dual-output voltage regulator based on sliding mode
control that provides a power efficiency comparable to the conventional solutions, but
potentially saves silicon area and input filter components. The design is based on the idea of
stacking traditional buck converters to provide multiple output voltages with the minimum
number of switches. Finally, a fully integrated buck converter based on sliding mode
control is proposed. The architecture integrates the external passive components to deliver
a complete monolithic solution with minimal silicon area. The buck converter employs
a poly-phase structure to minimize the output current ripple and a hysteretic controller
to avoid the generation of an additional high frequency carrier waveform needed in
conventional solutions. The simulated results are comparable to the state-of-the-art works
even with no additional post-fabrication process to improve the converter performance.
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Capacitive Wireless Power Transfer to Biomedical Implants: Link Design, Implementation, and Related Power Management Integrated CircuitryErfani, Reza 02 September 2020 (has links)
No description available.
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