2026-05-24T21:40:45Zhttps://keep.lib.asu.edu/oai/requestoai:keep.lib.asu.edu:node-1541082024-12-20T18:25:12Zoai_pmh:alloai_pmh:repo_items154108
https://hdl.handle.net/2286/R.I.36049
http://rightsstatements.org/vocab/InC/1.0/
All Rights Reserved
2015
x, 47 pages : illustrations (some color)
Masters Thesis
Academic theses
Text
eng
Singh, Shrikant
Kiaei, Sayfe
Bakkaloglu, Bertan
Kitchen, Jennifer
Arizona State University
Partial requirement for: M.S., Arizona State University, 2015
Includes bibliographical references (pages 45-47)
Field of study: Electrical engineering
A single solar cell provides close to 0.5 V output at its maximum power point, which is very<br/><br/>low for any electronic circuit to operate. To get rid of this problem, traditionally multiple<br/><br/>solar cells are connected in series to get higher voltage. The disadvantage of this approach<br/><br/>is the efficiency loss for partial shading or mismatch. Even as low as 6-7% of shading can<br/><br/>result in more than 90% power loss. Therefore, Maximum Power Point Tracking (MPPT)<br/><br/>at single solar cell level is the most efficient way to extract power from solar cell.<br/><br/>Power Management IC (MPIC) used to extract power from single solar cell, needs to<br/><br/>start at 0.3 V input. MPPT circuitry should be implemented with minimal power and area<br/><br/>overhead. To start the PMIC at 0.3 V, a switch capacitor charge pump is utilized as an<br/><br/>auxiliary start up circuit for generating a regulated 1.8 V auxiliary supply from 0.3 V input.<br/><br/>The auxiliary supply powers up a MPPT converter followed by a regulated converter. At<br/><br/>the start up both the converters operate at 100 kHz clock with 80% duty cycle and system<br/><br/>output voltage starts rising. When the system output crosses 2.7 V, the auxiliary start up<br/><br/>circuit is turned off and the supply voltage for both the converters is derived from the system<br/><br/>output itself. In steady-state condition the system output is regulated to 3.0 V.<br/><br/>A fully integrated analog MPPT technique is proposed to extract maximum power from<br/><br/>the solar cell. This technique does not require Analog to Digital Converter (ADC) and<br/><br/>Digital Signal Processor (DSP), thus reduces area and power overhead. The proposed<br/><br/>MPPT techniques includes a switch capacitor based power sensor which senses current of<br/><br/>boost converter without using any sense resistor. A complete system is designed which<br/><br/>starts from 0.3 V solar cell voltage and provides regulated 3.0 V system output.
Electrical Engineering
charge pump
Integrated circuits
Maximum Power Point
Photo voltaic
power management
Solar Cells
Solar Cells
Integrated circuits
On-chip charge pumps
Power management IC for single solar cell