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We believe that the best way to do the dimming is simply to vary the input voltage of the power supply.
… Thanks, I see, because there’s no way of knowing how far apart the tunnel lights should be, you do it by trial and error with this “clip-on-off” inductive coupler lighting system.We did this for a tunnel way back in 1998
Thanks, I could be wrong, but I think resonant pick-up loops are for when you’re doing it wirelessly….when you have tightly coupled couplers like we have, there is no need for this resonant method I believe. In effect, all we have done is very simple indeed….we have just taken a series parallel resonant converter, and “ripped its guts open” and spread them out along 30 metres, and then simply connect secondaries along it. Its so incredibly simple that you wonder why its not a commonly spoken about technique, with off-the-shelf couplers available etc etc.they have a resonant pickup loop, and vary source frequency to control secondary current.
Thanks, what do you make of the third lamp down in my schematic of post #1, which could use the shorting fet to pwm the secondary side bus and give dimming operation to an individual lamp?obviously it is far easier to have all the lamps the same brightness if you control a current loop....
Thanks, I could be wrong, but I think resonant pick-up loops are for when you’re doing it wirelessly….when you have tightly coupled couplers like we have, there is no need for this resonant method I believe.
A point to consider is also skin effect of the cable at 100 kHz, have you calculated it?
Thanks, essentially the system i show here, as you know, is absolutely nothing knew...its simply a modified Seris Parallel resonant converter with its 'guts dragged out' so that the multiple ferrite couplers can be clipped on. It really is no more than that. -Just a standard topology.I wonder if the product violates patents or trade marks of existing inductively powered lighting systems?
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