Post on 23-Feb-2016
description
1
Electrical Systems Overview
Presented by Jasper Nance
2
Outline
1. System Overview
2. Power Transmission
3. Power Storage
4. Power Utilization
5. Some extra details
3
Design Challenges and Risks
• Weight • Transmission of very large amounts of power• Expensive of the laser system
Challenges
Risks
• Reflected laser radiation poses a hazard• High energy densities pose a fire risk for onboard
systems and sensors
4
System Overview
Power Source
Power Supply
Beam Source
Beam Receiver
1rst
Power Converter
Ultra-capacitor bank
Transmission
Reception and Storage
Use
2nd Power Converter
Control System Motor(s)
5
TransmissionPower Source
• Unlimited power from 110V mains provided
Power Supply
• ~10KW power supply
• Laser supplies more complex
Beam Source
• 8KW Laser• Guidance system• Safety Cutoff
6
Reception and Storage• Laser: Solar Cells• Wifi feedback to guidance system
• Buck-boost topology
• Several KW• Outputs safe voltage level for
caps (2.5V, 5V)
• Store excess energy while at maximum power transfer
• Each cap is 2500 Farads
• 7800 joules of energy
• Capable of extremely high power
Beam Receiver
1rst
Power Converter
Ultra-cap bank
7
Utilization• Optimized converter for ultra-cap
levels• Provides power to the motor at a
stable and controllable level• Monitors system for
• Speed• Power• End of climb• Descent• Emergency stop signal
• DC Motor 12 / 24 / 36V• Powers climb
2nd Power Converter
Control System
Motor(s)
8
Research Since large amounts of energy are required at the receiving end, high
efficiency cells must be utilized.
Focusing and Alignment
Wavelength of the photovoltaic cells should match to achieve maximum power transfer.
Designing a photocell array that is both rigid and lightweight.
Converting the electricity into a useable voltage/current.
Texas Scribbler
9
Laser Power Transmission Components• Beam Emitter:• Produces high-intensity, beam of light
– Beam must be focused over entire vertical ascension– Ideally spectrum optimized to transducer element
Laser radiation• considerably more expensive• less focusing hardware needed• Better for longer distances
4500W “Sky Tracker” lamp
2000W Diode Laser Array
10
Ultracapacitors
Step5: Charge the ultracapacitors
• 2500F 2.5V
• 7800 Joules
11
EE Teams• EE Team 1: Guidance system and wifi feedback
• Controlling a tri-axis gimbal mount• Use wifi link to maintain aim• Design around laser pointers
• EE Team 2: Power converter design • ~1KW design• Begin with dummy source and provide power
to caps, motor• Must be extremely lightweight!