General > General Technical Chat
The uBeam FAQ
mikeselectricstuff:
--- Quote from: EEVblog on January 14, 2019, 11:06:00 pm ---So what is this "Burst circuit"?
Clearly they got another board made as the photo shows a 2nd board attached to the Burst circuit, and the silkscreen is different on the OHSpark one vs the photo unit.
A guess would be that the "burst circuit" perhaps decodes any data modulation on the ultrasonic, and the board next to it is the energy harvesting circuit?
--- End quote ---
Or maybe stores up energy in a big cap to deliver in bursts to provide a reasonable charge current for a battery.
sdpkom:
There are clearly two antennas on the FPGA board.
I wonder how this no electromagnetic thing going with two rf antennas and an open switching ps
StillTrying:
"I wonder how this no electromagnetic thing going with two rf antennas and an open switching ps"
There will be quite a bit of high power ~40kHz nearby switching going on as well. :)
The demo kit doesn't look realistic with no wires anywhere, perhaps it's just for show, with 30 engineers X 18 months surely they could have put it in an aluminium case, instead of a pizza box so that it at least looked right.
With the size of the receiving panels, surely just sticking a much smaller PV on the the IoTs would be better and wouldn't need any of the transmitter junk.
I wonder how they're getting on with all these 2017 Q4 claims, they must have well known what they were actually capable of at the time. If I was an investor I would be using some F words, and they wouldn't be funny or more funding. :horse:
sdpkom:
--- Quote ---With the size of the receiving panels, surely just sticking a much smaller PV on the the IoTs would be better and wouldn't need any of the transmitter junk.
--- End quote ---
A PV indoors generates 10s of microwatts.
You need to aim a high power light source at it to power it.
While outside you get 1000W/m^2 insude you get 0.5W/m^2
coppice:
--- Quote from: sdpkom on January 15, 2019, 02:22:46 pm ---
--- Quote ---With the size of the receiving panels, surely just sticking a much smaller PV on the the IoTs would be better and wouldn't need any of the transmitter junk.
--- End quote ---
A PV indoors generates 10s of microwatts.
You need to aim a high power light source at it to power it.
While outside you get 1000W/m^2 insude you get 0.5W/m^2
--- End quote ---
Most IoT devices with PV would generate no power at all, as they are located in dark corners and cupboards.
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