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Hi,
A bit more information, please.
Description, timings, picture...
What do you want to precharge?
What's the expected overcurrent behaviour?
Klaus
Hi,
Without giving more (requested) details... it will be hard to help.
(sorry, that we can´t read your mind)
Klaus
Hi,
you say "I don't have any critical specifications for timings", but then you say 1us.
--> This is much too fast for a fuse to blow. Thus I´d say this is critical.
I don´t think this 1us makes sense. Or I don´t understand...
*****
You say "Load: capacitive". But no value. It may be 100pF stray inductance, it may be 100.000uF of low ESR electrolytics, it may be a battery....
From the values: 240A, 1us, 48V... it could be a 5uF capacitor. Is this the case? You want to charge a 5uF capacitor within 1us from 0 V to 48V?
Klaus
Example of method to limit inrush current, then turn on a relay (per post #4).
At powerup the load receives reduced inrush current through a low-ohm resistor.
The capacitor charges for about 1 milli-Sec, then NPN turns on the relay. Relay must be rated to deliver full power to load.
View attachment 149109
This is 5kW of heat. (I can heat my whole house in winter with 5kW.)These simulations have the power supply ranging from 50-70 V. The load does not go above about 100 A.