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