Finished: current limiting breaker

[T3sl4co1l]

Whassit do?  No idea, it's bedtime, I'll let you savor the mystery until then...

Tim

[BrianHG]

It makes you dinner.

[Nusa]

Clearly it causes uncontrollable sleepiness.

[rx8pilot]

Does it have 7 transistors?

[T3sl4co1l]

Does it have 7 transistors?

Unfortunately I wasn't able to do it in 7 transistors, though arguably, the core analog part is about 7 transistors, but there's about 14 transistors total, except it's 15, plus a logic gate. Not even a good rationalization exists! 

Unfortunately it does not make dinner, indeed it prevents cooking things.

The function is a 30V, 20A current limiting breaker.  It is bidirectional -- doesn't matter which way around you hook it up, or if you have a load that's charging or discharging.  It is also efficient, or, it can be: it has a buck converter action, so if you connect the ground return to supply negative, the excess power is recycled rather than dissipated.  Breaker action clears in 150ms: more than long enough to start the heaviest capacitive loads.

I built it specifically for my laboratory 24VDC supply (some lead acid batteries, a fusebox, charger and whatever loads I wire in), so I'm not constantly burning fuses or sparking connections as I work with motors, controllers, converters, inverters and so on.

It is also a switch.  Pushbuttons turn it on and off, or there are pins on the header to trigger them with optoisolators.  This allows everything from automotive to industrial load switching, with safe starting and limiting.

Tim

[T3sl4co1l]

Here's the front panel graphics.  Had to wait until today to draw it.



Tim

[oldway]

Congratulations, 

Is this a project you have done for yourself, for one of yours customers, or do you intend to sell it on the market ?

[T3sl4co1l]

Quite marketable, yes.  Looking for interest, and suggested market places.

Tim