| General > General Technical Chat |
| Has anyone seen this - Voltserver: "Digital Electricity" |
| << < (6/20) > >> |
| schmitt trigger:
And people thought that Tesla was crazy because of his attempts to send power wirelessly. :o |
| PlainName:
--- Quote ---So unless they have extensive shielding and filtering --- End quote --- I am reminded that aircraft use 400Hz or so (albeit rather than chopped DC). Although the airframe is pretty much a faraday cage they presumably have serious filtering to protect the internal electronics? |
| Cyberdragon:
--- Quote from: dunkemhigh on February 16, 2018, 10:12:42 pm --- --- Quote ---So unless they have extensive shielding and filtering --- End quote --- I am reminded that aircraft use 400Hz or so (albeit rather than chopped DC). Although the airframe is pretty much a faraday cage they presumably have serious filtering to protect the internal electronics? --- End quote --- Absolutely, the wires have mesh shielding like coax does. Sometimes even multiple layers. Also, "Touch Safe" "High Voltage" :bullshit: If it's so "safe" then show someone grabbing the two conductors. Or better yet, LICK IT! Bet you they won't! The only way for that to be possible is if the current shuts off faster than your nerves conduct. But even then it's impossible to tell a legit load from a person across the lines. They might just be using some sort of GFI, but that's only to ground, not across the conductors! Not "touch safe"! :-- |
| PlainName:
The short pulse won't kill you, will it? They say that another doesn't get sent until the remote agrees that the prior one was safe, so if they have some way of detecting a problem that should solve that. But... what, and how, can be detected? I am thinking that the sender can say how my power there was in the pulse and the receiver can check that the same amount arrived. Would that detect a potentially fatal grab? I am not expert enough, but I am also reminded of the table saw safety feature that shot a bolt into the saw if it detected a finger about to be chopped. On the face of it I would have said it couldn't possibly react fast enough, but I've seen the videos of saveloys being shoved in and coming out unmarked. I note that no-one ever used a real finger in a demo. It's probably worth pointing out that 'non-fatal' doesn't necessarily mean 'unnoticeable'. If you got a tingle, even a large one, I think that would count as working but would ensure you wouldn't keep doing it just to see if it works. Whilst safety devices should be tested often, you don't test them for real - you /have/ to allow that this one time it won't work. Doesn't invalidate the device, though, since it only has to work once to have been useful. |
| ogden:
--- Quote from: StillTrying on February 15, 2018, 10:51:40 pm ---50/60Hz power cables cause enough problems without converting it to 600Hz 336V square waves. --- End quote --- Could you please tell where you see square waves? Waveforms shown in patent applications are far from square wave. I don't think that they are so stupid to do such an simple mistake - make product with EMI issues. |
| Navigation |
| Message Index |
| Next page |
| Previous page |