Using state of the art devices and PCB design we've made a reasonably small and lightweight isolation switch capable of switching high current batteries directly. Advantages we think this offers:
- Isolation of all electronics on the ground for safety
- No connection pitting compared with using large switch based isolation solutions
- Minimization of EMC radiation as connectors are plugged in and out
- External electronics can be used to switch the power system on / off
- Auto Off in case of aircraft incident. A pull out cable can switch power off automatically
- Simple very low current toggle switch can be mounted more or less anywhere for easy power isolation
Isolation (switching) normally happens when very low current is drawn, however the switch still needs to pass the full current when ON. This switch will happily pass through the heavy currents required by many large multi-copters and electric aircraft. (70A continuous. Much higher for few seconds bursts).
Some testing at 140A:
We think this is a unique solution on the market today, please do tell us if this is not the case.
Please come to see more details on our site:
Bluelight Technologies
Comments
Some interesting reading regarding solid state vs mechanical switches: http://www.ixysic.com/home/pdfs.nsf/www/AN-145.pdf/$file/AN-145.pdf
Mark - Custom design work is probably beyond the budget I have to play with for my solar wing project unfortunately. But I would love to talk to you about the potential for developing this type of small form factor solid state high current isolation switch for use in the Automotive Aftermarket, 4WD, Caravan/Motorhome, Marine and Off Grid Solar/Communication market segments. I have shot you a PM if you would like to chat about it further.
Hi Quadzimodo, we're also an electronics design house, if appropriate we can also look at designing as special switch for you.
Ok thanks Mark
Sadly, it's back to the old servo actuated DPDT clunker for me I think.
Hi Stuart, one way only I'm afraid. It will handle inductive loads though, but the reverse current is just dissipated away.
Hi Martin, I'm not sure but it doesn't look like solid state solution, looks more like a magnetic relay of some sort
Interesting. Will this allow bi directional current flow? I am building a project that uses escs with ative freewheel regen, so when decelerating current goes back towards the battery.
I found a similar product --> http://shop.rc-electronic.com/SPS-SYSTEMS/SPS-SafetyPowerSwitch-34V...
Your have a much more reasonable price though.
We achieve an internal on resistance of 0.00065 ohm, so heating is very much minimized. For the BL-Smart70SW a heat sink (other than the one already inside the unit) should not be necessary. The next version, the BL-Smart100SW will need one for those running at 100A continuous with limited airflow. The heat sink we plan to use will not be any larger than the area of the current 70 version, but we didn't complete all our testing on this version yet.
Incidentally the switch should (theoretically) be able to handle in-rush currents up to 1,500A.
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