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ECE 791/792 Oral Proposal Project Team: Peter Lorenz, Ryan Lashin ECE Faculty Advisor: Dr. Kent Chamberlin Current Date: 10/30/2009 Project Completion Date: May, 2010 General Overview • Tesla coil that reproduces sound • Solid State Digital Control • Design broken into three main parts o Audio detector o Solid state coil driver o Tesla coil Part I: Audio Detector • Converts audio signal into control signal • Researching several different conversion methods • Detector needs to be voltage isolated from driver circuit Part II: Driver Circuit (Control Circuit) • Audio detector signal switches MOSFET •MOSFET controls current flow through inductive load o High – signal generator drives through inductive load o Low – No current passes through inductive load Part II: Driver Circuit (Signal Generator) • Signal generator – sawtooth waveform o Converts to train of positive impulses • Needs to supply high power (200 W-400 W best est.) • Needs to convert wall power to usable signal Part III: Tesla Coil (Coil Design) • Essentially giant air-core transformer o Large turns ratio (approximately 10 to 1200) • Determines resonant frequency o Driver circuit needs to match resonant freq. •Most challenging part to build physically Part III: Tesla Coil (Output) • Output – train of impulses bounded by square envelope o Impulses at resonant frequency • Resonant freq. >> audio freq. o Approximates continuous discharge • Envelope contains audio information Timeline Cost Estimate Cost projections Section Audio detector: Components Cost Amplifier: Signal modulation components: Voltage isolation: $30 Total $20 $15 $65 Driver circuit: Power mosfet: High voltage signal generator: .83 cents apiece with 10,000 unit order $200 $200 + ((# of mosfets)*.83) Tesla coil: Wire: PVC pipes: Torroid components: $40 $15 $50 $105 Misc: High voltage capacitors: Misc. electrical parts: $300 $150 $450 TOTAL PRICE: $820 + ((# of mosfets)*.83) Conclusion • Project is challenging but feasible • Components may be expensive, but cost can be offset • Power requirements make implementation more difficult o Heat dissipation techniques will be required • Personal safety measures will be taken •Project is a good representation of the theory we have learned thus far o A chance to practically apply our knowledge Questions?