Wireless Charging and Data Transmission via Resonant Beam Team 2005 - - PowerPoint PPT Presentation

Wireless Charging and Data Transmission via Resonant Beam

Team 2005

Kevin Krohomer, Joseph Roca, Natong Lin, and Miguel Castaneda Acosta

Outline

• Background
• Problem
• Solution
• Final Design
• Transmitting Circuit
• Receiving Circuit
• Constraints
• RACI Chart
• Budget
• Project Timeline for Fall

2019

• Project Timeline for

Spring 2020

Background

• Wi-Charge is exploring wireless power transmission.
• EE Department is looking to expand this technology.
• Wireless power and high-rate data transfer.
• We are looking to explore if this can be done efficiently.

https://pbs.twimg.com/profile_images/1152296500921286658/HOsbcNYg.jpg https://icdn1.digitaltrends.com/image/digitaltrends/cafe-iamge-wide-with-beams-416x416.jpg

Problem

• Develop a system that can wirelessly charge a device
• Relatively new technology
• Based off technology introduced by the company Wi-Charge
• Potentially will eliminate or reduce the use of wired charging

Solution

• Use a wireless transmitter and receiver system
• Transmitter

○ Laser transmitting system ○ Generates and sends a laser containing certain wattage to the receiver

• Receiver

○ Receives laser signal and turns it into voltage ○ Feedback laser to transmitter

Transmitting Circuit

• Power Supply
• 10 W Laser
• Second Power Supply
• 1.6 W IR Laser
• Photodetector
• Microcontroller
• Beam Expander

10 W 520 nm Laser

• The main transmitting signal
• Sends 10 W of power to the PV cell
• Laser produces photons at 520 nm
• Size: 23 mm X 207 mm
• Beam Diameter: 2 mm

20X Achromatic Beam Expander

• Expands the beam diameter

○ 2.0 mm → 40.0 mm

• Galilean expander design

○ Suitable for high power lasers

Power Supply

• Used to power the 10 W laser
• Uses a transformer, voltage regulator, full bridge rectifier, and an RC filter

○ All circuit components calculated to get the right output voltage

• Converts AC input out of the power socket to DC input to power the laser

1.6 W IR Laser

• Laser used as a switch for the entire system

○ 10 W laser is powerful so we need a mechanism to ensure safety

• Trip wire used to shut off the entire system if touched

Photodetector

• Data

○ Spectral Range: 400 - 1100 nm ○ Sensor Size: 11.3 mm ○ Maximum Measurable Power: 2.0 W

• To detect the optical feedback from the

corner reflector located in the receiver end

• Detects when the laser is not feeding a

signal into it

Microcontroller

• Microcontroller is an integrated circuit that

can be programmed for a specific purpose

• Receives signal from photodetector and

turns the power supply off or keeps the power supply on based on that input

Receiving Circuit

• PV Cells
• Qi Receiver
• Corner Reflector
• Device

Corner Reflector

• Used to reflect the 1.6 W laser beam back from where it came
• Retroreflector

○ Protective silver coating to reflect wavelengths between 400 nm - 1000 nm ○ Perfect reflector in our situation

PV Cells

• Takes in laser beam as input and converts it

into voltage

• Used to power the Qi receiver so the device

can charge

• Efficiency: 47.1%

○ Efficiency = 1.12 eV/ 2.38 eV = 47.1% ○ PV Cell can take in 47.1% of power and turn that into voltage

Qi Receiver

• Takes the voltage from the PV cells and uses

it as a power source

• Uses inductance to charge the device

○ Consists of a coil of wires around a bar magnet ○ Induces a magnetic field that creates enough of a current to charge the device ○ Needs a 5 V power supply to work

Qi Receiving Circuit

Final Design for Power Transmission

Final System Design

Constraints

• Technical
• Efficiency
• Amplification
• Alignment of components
• Societal
• Safety
• Budget
• Resonant cavity
• Optical components

Budget

Final Design Component Cost 10 W Laser pointer (520 nm) $129.99 1.6 W IR Laser Module (980 nm) $315.00 20X Achromatic Beam Expander $712.03 Photovoltaic Cell $7.15 Qi Receiver $14.95 Corner Reflector $375.00 Photodetector $645.00 Photodiode $55.72 Electrical components $18.97 Planar Reflector $0.93 DC-DC Converter $0.75 Beam splitters $193.00 Total $2,468.49

RACI Chart

Team Members Advisors/Sponsors Activity Joseph Roca Kevin Krohomer Natong Lin Miguel Castaneda Acosta Eric Donkor Shengli Zhou Communications Module R C R C A A Meet with Faculty Advisor R R R R A A Maintain Schedule C C C R I I Update the website C C C R I I Budget and Supplies Table C R C C A A Laser Theory & Laser Testbed Setup C C R R A A Microcontroller Software & Receiver Circuit R R C C A A Power Supply & Photovoltaic cell R C R C A A Switching circuit & Photodetector C R C R A A Written Proposal R C R C A A Design Review PowerPoint C R C R A A Final Presentation PowerPoint R C R C A A Final Written Report C R C R A A R Responsible The person responsible for getting the work done A Approvers The person who must approve the completed work C Consulted Anyone who will participate in the work I Informed Anyone who needs to know about work status or completion

Project Timeline for Fall 2019

Project Timeline for Spring 2020

Thank you