WIRELESS POWER TRANSMISSION FOR SOLAR POWER SATELLITE

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WIRELESS POWER TRANSMISSION FOR SOLAR POWER
SATELLITE
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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.

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Executive Summary

• Difference Between
• - Communication System.
• - WPT System.
• Typical WPT is point point power transmission.

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• Famous taper method.
• 1.Gaussion Taper.
• 2.Taylor Distribution.
• 3.Chebychev Distribution.
• suppression of side lobe
• To increase the power transmission efficiency.

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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
  cells.
• Such system is different from the classical SPS
  using MPT.
•  

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WPT Wavelength Trade for SSP
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• SOLAR POWER SATELLITE SYSTEM

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• SPS CONCEPT
• It consists of mainly three segment.
• 1. Solar energy collector
• 2. DC to Microwave converter
• 3. Large Antenna Array.

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MSC-1A Lunar and Mars Power (LAMP)
ApplicationLaser WPT to Photo-Voltaics on the
moon or Mars
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• RECENT TECHNOLOGIES AND RESEARCHES

• Antenna Transmitter
• Beam Control, target detection, propogation
• Receiver rectifier

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1. ANTENNAS AND TRANSMITTER 
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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.

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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.

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Microwave Generator/Amplifier option for MPT

• 1.Microwave Tube (Cooker-type Magnetron)
• 2.Semiconductor Amplifier.

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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.

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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.

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• 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

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Compare the weight by power-weight ratio.
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Compact Microwave Energy Transmitter With PCM
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2.BEAM CONTROL, TARGET DETECTION, PROPAGATION
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Recent Technologies of Retro directive Beam
Control

• 1.Corner Reflector
• 2.Van Atta Array
• 3.Phase conjugate Ckt.

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• CONER REFLECTER

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• VAN ATTA ARRAY

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• PHASE CONJUGATE CIRCUIT

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• There are another method for the target detection
  is Software Retro directive.
• Computer is usually used for the software retro
  directive.

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3. RECEIVERS AND RECTIFIERS  

• Rectenna
• Rectenna array
• Cyclotron Wave Converter

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Schematic Picture of Cyclotron Wave Converter
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CWCs Developed in Russia
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EFFICIENCY

• 1.RF-DC Conversion Efficiency.
• 2.Beam Collection Efficiency.
• 3.DC-RF Conversion Efficiency.

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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)

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(a) Efficiency of 2.4 GHz Rectenna
(a) Efficiency of 5.8 GHz Rectenna
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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.

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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.

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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.
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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

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Caution Note

• Microwave Power Transmission is Effected on Human
  Health.

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THANK YOU