Underwater Wireless Power Transfer (UWPT) Design Review II Team - - PowerPoint PPT Presentation

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Underwater Wireless Power Transfer (UWPT) Design Review II Team - - PowerPoint PPT Presentation

Feb 21, 2024 456 likes •645 views

Underwater Wireless Power Transfer (UWPT) Design Review II Team 1715 Alex Slossberg Frank Ludorf Justin Walters Kyle Buckley Overview Of Project 1. Summary 2. Hardware a. Coil Driver b. Rectification and Boost Converter 3. Control System a.

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SLIDE 1

Team 1715 Alex Slossberg Frank Ludorf Justin Walters Kyle Buckley

Underwater Wireless Power Transfer (UWPT) Design Review II

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SLIDE 2
  • 1. Summary
  • 2. Hardware
  • a. Coil Driver
  • b. Rectification and Boost Converter
  • 3. Control System
  • a. Microcontroller
  • b. Machine learning
  • 4. Testing Setup
  • a. New Rig
  • 5. Experimental data

Overview Of Project

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SLIDE 3
  • Continuation from 2015-2016 Senior Design
  • Last years accomplishments

○ Transmitted 12VAC at 19 kHz using H bridge

  • 2016-2017 Improvements

○ Transmit 33 VAC bandwidth 150kHz-1MHz using amplifier ○ DC/DC Converter ○ Control System ○ Precision Testing Frame

Scope of Design

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SLIDE 4
  • AUVs recharging
  • Wave energy / Solar converters
  • Underwater sensor recharging
  • Buoy recharging

Applications

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SLIDE 5

Experimental Setup

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SLIDE 6

Series Series Compensation

Simplified Network

Resonant Frequency of RLC circuit

Transmitter Receiver

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SLIDE 7
  • Flat spiral coil
  • Identical pair
  • Copper magnet wire
  • 3D printed base
  • Self inductance measured

= 70uH at 150kHz

  • Calculated = 77.8uH

Final Coil Design

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SLIDE 8

Transmitter Circuit

Op-Amp PA94 Bandwidth 20kHz-1MHz Voltage P-P 38V-28V Max Voltage P-P 900V Current Output 50mA Current Max 100mA Gain 17.4 Slew Rate 600V/us

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SLIDE 9

Receiver Circuit: Full Bridge and Boost

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SLIDE 10
  • Using an ATmega328p chip to handle the

control system Process

  • Generate K values beforehand based on

circuit values

  • Read the secondary sides current and

voltage via two ADC reads

  • Duty cycle is then adjusted to achieve

maximum efficiency

Ideal Control System

Voltage Characteristics

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SLIDE 11

Process

  • ATmega328p changes the duty

cycle

  • Examine the voltage change
  • Adjust the duty cycle accordingly

for set voltage Reasons we used this system

  • Changed for simplicity

Actual Control System

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SLIDE 12
  • Modeled in SOLIDWORKS
  • Precision alignment of coils for test
  • Increased coil turns and outer diameter
  • Corrosion resistant materials

▫ Nylon threaded rod, 3d printed plastic

  • Non magnetic at coil interface

Testing Setup

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SLIDE 13

Measured Voltage Vs. Distance

Parameter Value Frequency 300 kHz Period 3.33 ns Input Voltage 28 VAC Rail Voltage +- 30VDC Forward Voltage 300 mV Compensating Capacitor 12nF

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SLIDE 14

Parameter Value Frequency 300 kHz Period 3.33 ns Input Voltage 28 VAC Rail Voltage +- 30VDC Forward Voltage 300 mV Compensating Capacitor 12nF

Measured DC Voltage Before DC/DC Boost Converter

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SLIDE 15

As distance increases

  • ur ability to boost

the voltage is limited

Measured Voltage after DC/DC Boost Converter

Parameter Value Frequency 150kHz Period 6.66 ns Input Voltage 28 VAC Rail Voltage +- 30VDC Forward Voltage 300 mV Compensating Capacitor 12nF

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SLIDE 16

Total Budget: $1000 Remaining : $213.12

Budget Report

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SLIDE 17
  • Active rectification

▫ Eliminate forward voltage drop

  • Driver stage for op-amp

▫ Increased current gain

  • Monolithic function

generator IC: XR-2206

▫ Independent sine generator ▫ Or use microcontroller

Hardware Improvements

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SLIDE 18

Questions?