Time Reversed Electromagnetic Wave Propagation as a Novel Method - - PowerPoint PPT Presentation

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Time Reversed Electromagnetic Wave Propagation as a Novel Method - - PowerPoint PPT Presentation

Dec 01, 2022 124 likes •441 views

Time Reversed Electromagnetic Wave Propagation as a Novel Method of Wireless Power Transfer Frank Cangialosi, Tyler Grover, Patrick Healey, Tim Furman, Andrew Simon, Steven M. Anlage 1 Current State of Long-Range WPT Ubiquitous WPT requires

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SLIDE 1

Time Reversed Electromagnetic Wave Propagation as a Novel Method

  • f Wireless Power Transfer

Frank Cangialosi, Tyler Grover, Patrick Healey, Tim Furman, Andrew Simon, Steven M. Anlage

1

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SLIDE 2

Current State of Long-Range WPT

Microwave Beaming Ubiquitous WPT requires greater range than provided by near-field technologies

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SLIDE 3

Current State of Long-Range WPT

Microwave Beaming

X

Obstructions Precise Alignment

Ubiquitous WPT requires greater range than provided by near-field technologies

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SLIDE 4

Current State of Long-Range WPT

Microwave Beaming

Obstructions Precise Alignment

Ubiquitous WPT requires greater range than provided by near-field technologies

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SLIDE 5

Current State of Long-Range WPT

Microwave Beaming

Obstructions Safety Hazard Precise Alignment

Ubiquitous WPT requires greater range than provided by near-field technologies

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SLIDE 6
  • 15
  • 10
  • 5

5 10 15 0 2 4 6 8 10 12 14 Voltage (mV)

Time Reversal

S T

  • 1. Time Forward Step

Target requests power, source records sona Target Device Power Source

A signal-focusing technique (Enclosed cavity with reflecting walls)

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SLIDE 7
  • 15
  • 10
  • 5

5 10 15 0 2 4 6 8 10 12 14 Voltage (mV)

Time Reversal

S T

  • 1. Time Forward Step

“Sona" Gaussian Pulse (50 ns)

Target requests power, source records sona Target Device Power Source

A signal-focusing technique (Enclosed cavity with reflecting walls)

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SLIDE 8
  • 15
  • 10
  • 5

5 10 15 0 2 4 6 8 10 12 14 Voltage (mV)

Time Reversal

S T

  • 2. Time Reverse Step
  • 400
  • 300
  • 200
  • 100

100 200 300 400 13.45 13.46 13.47 13.48 13.49 13.5 13.51 Voltage (mV) Time(µs)

“Sona"

  • 1. Time Forward Step

Target requests power, source records sona Source reverses and broadcasts, sona reconstructs on target Power Source Target Device

A signal-focusing technique (Enclosed cavity with reflecting walls)

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SLIDE 9
  • 15
  • 10
  • 5

5 10 15 0 2 4 6 8 10 12 14 Voltage (mV)

Time Reversal

S T

  • 2. Time Reverse Step
  • 15
  • 10
  • 5

5 10 15 2 4 6 8 10 12 14

  • 400
  • 300
  • 200
  • 100

100 200 300 400 13.45 13.46 13.47 13.48 13.49 13.5 13.51 Voltage (mV) Time(µs)

“Sona"

  • 1. Time Forward Step

Target requests power, source records sona Source reverses and broadcasts, sona reconstructs on target Power Source Target Device

A signal-focusing technique (Enclosed cavity with reflecting walls)

slide-10
SLIDE 10
  • 15
  • 10
  • 5

5 10 15 0 2 4 6 8 10 12 14 Voltage (mV)

Time Reversal

S T

  • 2. Time Reverse Step
  • 15
  • 10
  • 5

5 10 15 2 4 6 8 10 12 14

  • 400
  • 300
  • 200
  • 100

100 200 300 400 13.45 13.46 13.47 13.48 13.49 13.5 13.51 Voltage (mV) Time(µs)

“Reconstruction” pulse “Sona"

  • 1. Time Forward Step

Target requests power, source records sona Source reverses and broadcasts, sona reconstructs on target Power Source Target Device

A signal-focusing technique (Enclosed cavity with reflecting walls)

slide-11
SLIDE 11
  • 15
  • 10
  • 5

5 10 15 0 2 4 6 8 10 12 14 Voltage (mV)

Time Reversal

S T

  • 2. Time Reverse Step
  • 15
  • 10
  • 5

5 10 15 2 4 6 8 10 12 14

  • 400
  • 300
  • 200
  • 100

100 200 300 400 13.45 13.46 13.47 13.48 13.49 13.5 13.51 Voltage (mV) Time(µs)

“Reconstruction” pulse “Sona"

  • 1. Time Forward Step

Target requests power, source records sona Source reverses and broadcasts, sona reconstructs on target Power Source Target Device

A signal-focusing technique (Enclosed cavity with reflecting walls)

Good for rectification

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SLIDE 12

5

Time Reversal for WPT

1 Ray-chaotic environment Requires… Provides… 2 Reflective surfaces 3 Spatial reciprocity

  • f the wave equation

2 Resilience to

  • bstructions

1 Range (not limited to free space drop-off) 3 Power concentrated at any given location

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SLIDE 13

6

Experimental Setup

+35 0 (mm)

  • 35

Scattering panels ensure ray chaos

Oscilloscope AWG PSG

Device (on MikroMove) Power Source

(5Ghz, 3dBm)

Wave Generation (TX) Wave Analysis (RX)

MATLAB

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SLIDE 14

7

Spatial Profiling of Reconstruction

+35 0 mm

  • 35

Target: 0

Constant Velocity 0.2 mm/s

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SLIDE 15

7

Spatial Profiling of Reconstruction

+35 0 mm

  • 35

Target: 0

Constant Velocity 0.2 mm/s

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SLIDE 16

7

Spatial Profiling of Reconstruction

+35 0 mm

  • 35

Target: 0

Constant Velocity 0.2 mm/s

slide-17
SLIDE 17

7

Spatial Profiling of Reconstruction

+35 0 mm

  • 35

Target: 0

Constant Velocity 0.2 mm/s

slide-18
SLIDE 18

8

Spatial Profiling of Reconstruction

V (x) = a ·

  • sinc

✓x + c b ◆

  • + d

x

V (x)

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SLIDE 19

8

Spatial Profiling of Reconstruction

V (x) = a ·

  • sinc

✓x + c b ◆

  • + d

x

V (x)

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SLIDE 20

8

Spatial Profiling of Reconstruction

Background noise

V (x) = a ·

  • sinc

✓x + c b ◆

  • + d

x

V (x)

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SLIDE 21

8

Spatial Profiling of Reconstruction

Background noise

V (x) = a ·

  • sinc

✓x + c b ◆

  • + d

x

V (x)

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SLIDE 22

9

Targeting a Moving Receiver

0.5 1 1.5 2 2.5 3 3.5 20 40 60 80 100 120 140 Peak-To-Peak Voltage (V) Time (s) V(t)

“Refresh” the sona before it gets stale

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SLIDE 23

9

Targeting a Moving Receiver

0.5 1 1.5 2 2.5 3 3.5 20 40 60 80 100 120 140 Peak-To-Peak Voltage (V) Time (s) V(t)

“Refresh” the sona before it gets stale

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SLIDE 24

9

Targeting a Moving Receiver

0.5 1 1.5 2 2.5 3 3.5 20 40 60 80 100 120 140 Peak-To-Peak Voltage (V) Time (s) V(t)

“Refresh” the sona before it gets stale

slide-25
SLIDE 25

9

Targeting a Moving Receiver

0.5 1 1.5 2 2.5 3 3.5 20 40 60 80 100 120 140 Peak-To-Peak Voltage (V) Time (s) V(t)

“Refresh” the sona before it gets stale

slide-26
SLIDE 26

9

Targeting a Moving Receiver

0.5 1 1.5 2 2.5 3 3.5 20 40 60 80 100 120 140 Peak-To-Peak Voltage (V) Time (s) V(t)

“Refresh” the sona before it gets stale

“Dead” time

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SLIDE 27

9

Targeting a Moving Receiver

0.5 1 1.5 2 2.5 3 3.5 20 40 60 80 100 120 140 Peak-To-Peak Voltage (V) Time (s) V(t)

“Refresh” the sona before it gets stale

“Dead” time

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SLIDE 28

10

Targeting a Moving Receiver

0.5 1 1.5 2 2.5 3 3.5 20 40 60 80 100 120 140 Peak-To-Peak Voltage (V) Time (s) V(t)

“Refresh” the sona before it gets stale

0.5 1 1.5 2 2.5 3 3.5 20 40 60 80 100 120 140 Peak-To-Peak Voltage (V) Time (s) V(t)

Experimental Results

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SLIDE 29

Potential WPT System

Supplier searches for participating devices (which may or may not have charge)

Steady State Initialization

Small fraction of power reflected by device, allowing supplier to find new location

Talk Session 5 Friday,17:45 (Selective Collapse of Nonlinear Time Reversed Electromagnetic Waves)

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SLIDE 30

12

Limitations And Future Work

Transfer efficiency

Use multiple channels

Environmental losses

Investigate and mitigate

Dead time

Use dedicated hardware TX and calculate new sona simultaneously These limitations are dependent on our lab equipment, they are not fundamental limitations of the technique

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SLIDE 31

13

Summary

Time Reversal

is a promising new basis for long-range WPT can transmit energy to receivers in motion does not require the receiver to be powered Talk Session 5 Friday,17:45

(Selective Collapse of Nonlinear Time Reversed Electromagnetic Waves)

Poster Session 2 Friday,14:40

(Time Reversed Wave Propagation as a Novel Method of WPT)

frank@cs.umd.edu anlage@umd.edu