J
John Devereux
- Jan 1, 1970
- 0
Hi,
I am putting together a high current supply and wondering about inrush
current.
The situation is a center-tapped 110V 3kVA transformer, feeding a
bridge rectifier and a large, high-ripple current capacitance:
..
.. -------- +70V
.. ----| |-------o------> 20A rms >---
..|| / | AC + | | |
..|| / 55 | | ----- 20,000uF [LOAD]
..|| / | | ----- |
..|| /-- | | | |
..|| / | | | |
..|| / 55 | | | |
..|| / | AC - | | |
..|| /----| |-------o------< 20A rms <---
.. -------- -70V
..
..
Simulation shows hundreds of amps for the first mains cycle!
Do I need to do anything to stop the local substation tripping out
when I plug it in?
Or will the transformer limit the current to a sane value?
I have looked at thermistor based "inrush current limiters" but they
don't seem to protect against short disconnections.
I am putting together a high current supply and wondering about inrush
current.
The situation is a center-tapped 110V 3kVA transformer, feeding a
bridge rectifier and a large, high-ripple current capacitance:
..
.. -------- +70V
.. ----| |-------o------> 20A rms >---
..|| / | AC + | | |
..|| / 55 | | ----- 20,000uF [LOAD]
..|| / | | ----- |
..|| /-- | | | |
..|| / | | | |
..|| / 55 | | | |
..|| / | AC - | | |
..|| /----| |-------o------< 20A rms <---
.. -------- -70V
..
..
Simulation shows hundreds of amps for the first mains cycle!
Do I need to do anything to stop the local substation tripping out
when I plug it in?
Or will the transformer limit the current to a sane value?
I have looked at thermistor based "inrush current limiters" but they
don't seem to protect against short disconnections.