proposal

John Hawkinson [email protected]

6.163 Final Project Proposal 29 Oct 2008

120VAC inverter Motivating idea: Kitchen appliances in my kitchen are subject to voltage drop because of insucient ampacity in the wiring. I'd like to ensure my toaster always receives 120VAC. For practical reasons, because my toaster is 900W, let's initially limit this to a smaller power output level. For safety reasons, and composibility, we'll divide the projcet into a 12VDC supply and a 120V inverter. Phases: Phase I: 120VAC inverter, runs from 12VDC, 100W output Phase II: 12VDC supply Phase III: Soup-up for 1kW output

Phase I: inverter I'd like my inverter to produce a true sine wave, both because that's more challenging, and also because I might want to use it outside my kitchen for electronics that might care. Strategy: Produce a 120V RMS sine wave with a boost-converter and PWM, and then lter it through an apprporiately-sized LC lter to make it smooth enough. Figure out an appropriate voltage reference to ensure that the output is stable at 120V independent of input voltage. Initially drive this from the battery or the kit supply.

Phase II: 12VDC supply Build an appropriate 12VDC supply to run the Phase I inverter. Possibly just buy or nd one if necessary. Or build one with a small transformer and a bridge rectier.

Phase III: 1kW inverter Not sure what's involved here. Large currents. Can we combine two Phase I inverters? Need advice.

Parts Some sort of appropriate chassis for kitchen use. Appropriate switches and fusing. GFCI outlet for the output of the inverter. Honkin' large FETs and LC lter.

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