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Understanding Humavox innovative wireless charging technology using RF energy harvesting.
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©Copyright 2011-2014 HumaVox Ltd
RF Energy HarvestingAmbient Energy sources
©Copyright 2011-2014 HumaVox Ltd
RF Energy HarvestingAmbient RF Energy sources
©Copyright 2011-2014 HumaVox Ltd
RF Energy HarvestingThe Concept
Base station
©Copyright 2011-2014 HumaVox Ltd
TxRx
RF Energy HarvestingThe Harvesting Unit
©Copyright 2011-2014 HumaVox Ltd
Single source
Static receiver
Portable receiver
Multiple sources
Static receiver
Portable receiver
RF Energy HarvestingThe Harvesting Unit
impedance matching
RectifierRF2DC
Summation &
StorageApplication
©Copyright 2011-2014 HumaVox Ltd
RF Energy HarvestingThe Harvesting Antenna
Narrow band antenna
wide band antenna
©Copyright 2011-2014 HumaVox Ltd
Antenna directivity
RF Energy HarvestingThe Harvester IM networkFrequency and power consideration
(-dBm) 0 dBm (+dBm)0
10
20
30
40
50
60
70
80
90
100
Passive ActiveE)%(
©Copyright 2011-2014 HumaVox Ltd
RF Energy HarvestingThe Harvester RF2DC unit
©Copyright 2011-2014 HumaVox Ltd
RF Energy HarvestingThe Harvester storage & summation unit
Single VS. multiple sources
CRF2DC 1
CRF2DC 2
CRF2DC n
+Cstorage
©Copyright 2011-2014 HumaVox Ltd
Cstep upCRF2DC
RF Energy HarvestingConclusions
©Copyright 2011-2014 HumaVox Ltd
advantage:
• Free energy• Wireless energy transfer• Portable devices
Disadvantage:
• Low power density (environment) • Low efficiency (RF2RF) • High efficiency conversion - complicated system• Limitation of ISM band