ece 477 design review team 15 spring 2013
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ECE 477 Design Review Team 15 Spring 2013
Jackson McCormick, Andrew Batek, Carey Woolet, Justin Lindley
Presentation Outline• Project overview • Project-specific success criteria• Block diagram• Component selection rationale• Packaging design• Schematic and theory of operation• PCB layout• Software design/development status• Project completion timeline• Questions / discussion
Project Overview - AbstractInterweaving the impressive visual power of electricity
and the visceral emotion of music, Acoustic Storm takes analog or digital audio input and outputs its own rendition using two varieties of solid state tesla coils.
Overview – Selected Design Details
• Input Options– Midi– Analog
• Multiple Coil types– Class E HFSSTC (Tweeters)– DRSSTC (Mids)
• Control Options– Temperature and spectrogram output– Potential for volume and tone control
Project-Specific Success Criteria1. An ability to decode MIDI input and output a PWM signal
at the corresponding frequencies2. An ability to receive analog input, digitize it using an
ADC, and output a PWM signal corresponding to the analog waveform
3. An ability to monitor and control system status (i.e. volume control and temperature monitoring) through an LCD and input system
4. An ability to generate and control a power output sufficient to drive an electrical arc based acoustic device
5. An ability to split audio signals at certain crossover frequencies and send them to a specific speaker (i.e. tweeters, mid, bass signals)
Block Diagram
Major Component Selection Rationale
• dsPIC Microcontroller– 16 Bit PWM– Digital Signal Library
• Wolfson ADC– 24 Bit Delta Sigma, I2S
• Vishay/ Siliconix MOSFET– 600 V Operation– Low switching times– Low Rdson
– High Current capability
Selection Rationale (cont.)• Coil Parameters
– HFSSTC Secondary Inductance– DRSSTC Primary Inductance– DRSSTC Secondary Inductance– DRSSTC Primary tank capacitor– DRSSTC Secondary capacitance
Packaging Considerations• Safety Considerations
– Physical Isolation – Plexiglas– Electrical Isolation – Faraday Cage
• Contact Close Switch• Power Circuitry located under coils• Coaxial Cable to carry PWM signals• Generic control box casing with large
distance between coils and control.
Coil Packaging
HFSSTC
• 12”x12”x20”• ~13.486 lbs.• ~$90
DRSSTC
• 20”x20”x24”• ~29.5 lbs.• ~$151
*Plexiglas is already owned by Team #15 – Cost will be significantly less than shown*
Detailed Coil Packaging Design
Coil Packaging AWB - 2/5/2013
Front/Side:
Top:
W/O Faraday Cage W/ Faraday Cage
20”
20”
12”
12”
20”
24”
Plexiglas Chain-link (or similar)
Scale: = 1”
DRSSTC Box HFSSTC Box
Schematic/ Theory of Operation• Overview
– Microcontroller– 5V/3.3V Supply – ADC– UART translating – LCD – 12V Supply – HFSSTC Control
Schematic/Theory of Operation
Schematic - Micro
Schematic – Power Supply
Schematic - ADC
Schematic - UART
Schematic - MIDI
Schematic - Outputs
Schematic
Schematic – 12V Supply
Schematic – HFSSTC Control
PCB Layout
• ADC close to audio input
• Multiple Voltage Levels
• Wide Traces
• Separate Areas for each function
• Aesthetics
PCB Layout
PCB Layout - Micro
PCB Layout - Power
PCB Layout - Inputs
PCB Layout - LCD
PCB Layout - Output
PCB Layout
Software Design/Development Status
• Completed – UART receive – PWM control function – SPI
• Development – State machine for midi to parse data
• Look up table for frequencies– Basic FFTs for Spectrum– FIR filtering for PWM outputs
Project Completion Timeline Week: 8 9 10 11 12 13 14 15 16 17
Obtain Workroom
Construction/ Design
- Power Supply
- HFSSTC
- DRSSTC
- Primary Capacitors
- Non- PCB Circuits
Programming
- MIDI
- ADC
- LCD
- Control
- Temp. Monitoring
Testing
Debugging
Design Tweaking/ Finishing
Questions / Discussion
Questions / Discussion
Questions / Discussion
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