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WIRELESS POWER TRANSMISSION FOR SOLAR POWER SATELLITE. OUT LINE. 1.Executive Summary. 2.SPS System. 3.Recent Technologies and research Antenna and Transmitters- Beam Control, Target Detection, Propagation Receivers and Rectifiers 4.Efficiency.

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Presentation Transcript
out line

OUT LINE

1.Executive Summary.

2.SPS System.

3.Recent Technologies and research

Antenna and Transmitters-

Beam Control, Target Detection, Propagation

Receivers and Rectifiers

4.Efficiency.

5.Radio Science Influences and Effect of SPS.

executive summary

Executive Summary

Difference Between

- Communication System.

- WPT System.

Typical WPT is point – point power transmission.

slide4

Famous taper method.

1.Gaussion Taper.

2.Taylor Distribution.

3.Chebychev Distribution.

suppression of side lobe

To increase the power transmission efficiency.

wireless power transmission options for space solar power
Wireless Power Transmission Optionsfor Space Solar Power
  • Far Term Space Systems to beam power to Earth
    • Radio-Wave WPT System
    • Light-Wave Systems
    • In a Light wave system highly concentrated solar radiation would be injected into the laser medium (direct solar pumping) and transmitted to earth and converted to electricity by photovoltaic cell’s.
    • Such system is different from the “classical” SPS using MPT.
wpt wavelength trade for ssp

Area of Significant Concern

Intermediate Area

Area of Significant Benefit

WPT Wavelength Trade for SSP
slide8
SPS CONCEPT

It consists of mainly three segment.

1. Solar energy collector

2. DC to Microwave converter

3. Large Antenna Array.

recent technologies and researches

Antenna & Transmitter

  • Beam Control, target detection, propogation
  • Receiver & rectifier

RECENT TECHNOLOGIES AND RESEARCHES

antennas for microwave power transmission

Antennas for Microwave Power Transmission

All antennas can be applied for both the MPT system and communication system

We have to use a phased array antenna for the MPT from/to moving Transmitter/receiver.

recent technologies for transmitters

Recent Technologies for Transmitters

Generation of Microwave

Need higher efficient generator/amplifier.

Highly efficient beam collection on rectenna array.

Higher stabilized and accurate phase and

Amplitude of microwave when we use phased

array system for the MPT.

microwave generator amplifier option for mpt

Microwave Generator/Amplifier option for MPT

1.Microwave Tube (Cooker-type Magnetron)

2.Semiconductor Amplifier.

magnetron

Magnetron

Generate and amplify high power microwave (over kW) with a high voltage (over kV) imposed.

Higher Efficiency.

Low cost.

Unstable freq/Uncontrollable phase.

Very Economical.

semiconductor amplifier

Semiconductor Amplifier

It generate low power micro wave with a low voltage

It is easy to control a phase and amplitude

Especially F class amplifier is expected as high efficient amplifier for the MPT system.

slide18

Distinguished from the ordinary use of the microwave technology

Pureness in spectrum

Efficient power generation and high efficient detector in a small and light fashion

Precise beam control

recent technologies of retro directive beam control

Recent Technologies of Retro directive Beam Control

1.Corner Reflector

2.Van Atta Array

3.Phase conjugate Ckt.

slide26
There are another method for the target detection is “Software Retro directive”.

Computer is usually used for the software retro directive.

3 receivers and rectifiers

3. RECEIVERS AND RECTIFIERS

Rectenna

Rectenna array

Cyclotron Wave Converter

efficiency

EFFICIENCY

1.RF-DC Conversion Efficiency.

2.Beam Collection Efficiency.

3.DC-RF Conversion Efficiency.

1 rf dc conversion efficiency

1. RF-DC Conversion Efficiency.

Efficiency of Rectenna – 80%

Decline of the Efficiency is caused by

-Array connection loss

-Change of connected load

-Trouble of the rectenna

-Any losses on the system(DC/AC conversion, cable)

slide32

(a) Efficiency of 2.4 GHz Rectenna

(a) Efficiency of 5.8 GHz Rectenna

2 beam collection efficiency

2. Beam collection Efficiency

Beam collection efficiency depends .

- transmitter and receiver aperture areas.

- wavelength, and the separation distance between

the two antennas

Efficiency – 89%

Decline Efficiency caused by

-Phase

-Frequency

-Amplitude Error on a Phase Array.

The rise of the side lobe decreases antenna gain and beam collection efficiency.

3 dc rf conversion efficiency

3. DC-RF conversion Efficiency.

We do not have to steer a micro-wave beam electrically.

If we need to steer (Guide or control).

We use phase shifter without grating lobes.

slide35

Power loss of the phase shifter is 4-6dB. - To solve this problem we use low power amplifier after high loss phase shifter without grating lobes.

conclusion
Conclusion
  • Microwave power Transmission is most suitable for a power transmission from moving transmitters to moving target than other transmissions modes.
  • Accurate Target Detection and High efficient Beam forming By Retro directive system for Solar Power Satellite.
  • Compatible with other radio services and Application.
  • Power transmission efficiency of WPT is higher than that other mode in reference to.
    • Higher efficient generator amplifier
    • Highly efficient beam collection rectenna array
caution note
Caution Note
  • Microwave Power Transmission is Effected on Human Health.
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