Low Voltage Power Amplifier - PowerPoint PPT Presentation

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Low Voltage Power Amplifier
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Low Voltage Power Amplifier

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  1. Low Voltage Power Amplifier Group Members: Toro Adebiyi Chuck Shue Scott Wiggins Faculty Advisor: Dr. Mark Halpin

  2. Abstract • Various power quality problems - power surges - voltage spikes/sags - outages • Benefits of problem “simulation” - assist in design of products - predict appliance behavior - provide useful safety and reliability information

  3. Design Constraints • Input signal - AC Sinusoidal from DAC - 5 VRMS (7.07 VPk-Pk) - 7.07 mARMS (10 mAPk-Pk ) • Output Signal - AC Sinusoidal from amplifier - 120 VRMS (169.7 VPk-Pk) - 7.07 ARMS (10 APk-Pk)

  4. Design Constraints (cont.) • Circuit efficiency - 90% or better • Temperature/Heat - temperature > 200 F @ transistor heatsinks • Harmonic Distortion - THD => 0.1%

  5. Potential problems with design • Efficiency vs. Available supply power • Harmonic distortion issues • Cumulative heat within circuit

  6. Project Design • Small signal power amplifier - can produce very accurate simulation - is simple to control/manipulate • Rectifier - DC power supply for amp from typical wall receptacle - protects against external power quality problems

  7. Project Design (cont.) Present circuit schematic: +Vcc Temporary place holder(by no means actual depiction :p) Vin R1 Vout R2 -Vcc

  8. Project Design, cont. Voltage Gain:

  9. Project Design, cont. Current Gain:

  10. Progress at present • Simulated Output: - ~35 VRMS, ~1.2 ARMS - THD of sine wave = 1.01% • Circuit power efficiency percentage: 95%

  11. Demonstration • Amplifier exhibited at early stages • Input signal source = function generator • Demo power supply limitations (all +/- 12V rails) • Output signal - ~21.5 Vpk-pk, ~430 mApk-pk

  12. Demo Voltage Gain

  13. Demo Current Gain

  14. Appreciation The low voltage power amplifier design team would like to take this time to express it’s thanks to the following individuals: • Dr. Mark Halpin • Dr. Joe Picone • Dr. Raymond Winton

  15. Thank you for attending.