Ideal Diode

Test Bench to capture exploding power supplies

The actual need for an Ideal Diode was something I was NOT even aware of.
That is, until Randy MacKay wrote a blog post on them, and shortly after I had the unfortunate experience of blowing 3 power supplies while plugging in batteries on a new Hexa build that uses 2 x 6S batteries in series.

Blown power supplies

I never would have been aware of the damage being caused if this BEC had not literally blown up while bench testing a drone.

Plugging a battery in

So what is really happening when the batteries are plugged in?
I was expecting some horrendous voltage spikes but this was bad enough.

Some Ideal diodes to test

I received a couple of these ideal diodes for testing from Jed Freeman of UAV Systems inc.

So what is happening?

A bit of background and testing

1

Failures

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Ideal Diodes