Electronics > Beginners
Power filter/capacitor board for custom build pinball machine
mvs:
--- Quote from: Kjelt on May 29, 2019, 09:21:27 am ---Normally a switch mode power supply (smps) does not like to have huge capacitance on its output since it disturbs the control loop.
This can often be found in the datasheet , but I can not find it in the Meanwell datasheet so it is going to be a trial and error.
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NTC thermistor, fuse and wires will introduce some parasitic resistance and inductance to the circuit. It may be sufficient to isolate supply from caps.
ogden:
--- Quote from: mvs on May 29, 2019, 10:42:13 am ---NTC thermistor, fuse and wires will introduce some parasitic resistance and inductance to the circuit. It may be sufficient to isolate supply from caps.
--- End quote ---
Even better solution is P-channel MOSFET in-rush current limiter.
Circuit from https://www.onsemi.com/pub/Collateral/AND9093-D.PDF
mvs:
--- Quote from: Raymond175 on May 28, 2019, 07:34:52 pm ---How to decide which connector pins to use for 48V 6.7A? Which can also be easily (dis)connected but will stay connected when in use
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Either you have a preferred connector type (like molex mini-fit, KK396, KK508 ...) or you can use parametric search (digikey.com, mouser.com ...).
--- Quote ---How to decide which thermistor to use?
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You will need a NTC thermistor for inrush current limiting. I would start with around 5 Ohms and 10A rated (~ 25-30mm diameter) NTC.
--- Quote ---How to decide which LEDs to use?
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I would go for some basic 5mm diffused LED and 2mA current drive. Current limiting resistor is then 22KOhm ( (48-3)/0.002=22K ), 0.25W ( (48-3)*0.002=0.09W + some safety margin).
Raymond175:
Ok, thanks I've got some great replies now!
I've drawn a diagram (and I'm new to this, so bear with me :)) with the following features (or at least what I intended):
* Indicator LED on circuit (capacitor decharger)
* Multiple power rails (for flippers, for slingshots, etc.)
* Fuses on all power rails
* Indicator LED on all power rails
Is my diagram and idea correct?
Thanks,
Raymond
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