Date

6-2014

Degree Name

BS in Electrical Engineering

Department

Electrical Engineering Department

Advisor

David Braun

Abstract

Cal Poly’s Energy Harvesting from Exercise Machines (EHFEM) project comprises of multiple subprojects seeking to effectively create a sustainable energy source through harvesting electrical energy generated from physical exercise machines. This project designs and implements a Buck-Boost DC-DC converter using a LT3791-1 4-Switch Buck-Boost Controller, replacing the previous SEPIC design. The DC-DC converter must operate within limits set by the maximum input range of the LT3791-1 controller. An input protection system prevents inputs higher than rated values, which may adversely damage the Buck-Boost DC-DC converter. These inputs include overvoltage transients, average voltage, and current output by the Precor EFX 561i elliptical generator. Therefore, integrating a modified version of Ryan Turner and Zack Weiler’s DC-DC Converter Input Protection System prevents system damage if generator outputs stray beyond safe operational range. This system also provides charge accumulation protection generated during an open-load phase during start-up of the Enphase M175 Micro- Inverter. Additionally, the DC-DC converter’s output must provide a voltage within the micro-inverter’s input voltage range to apply 240VRMS power back to the electrical grid.

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