Electronics > Beginners
Power filter/capacitor board for custom build pinball machine
Brumby:
I've had a look at the board you linked to - and the only functional part of that which relates to your issue is the 3 big capacitors....
If it were me, I'd be looking at something like 2000uF or more for each capacitor with at least 60V working voltage (based on the 48V power supply). (Would be good to see what value are actually used.) I'd also be looking for a low ESR to allow big current surges to pass.
The caution here is to not have too great a capacitance and too low an ESR that the power supply will object to charging them up when the machine is turned on.
Brumby:
--- Quote from: Brumby on May 29, 2019, 01:26:09 am ---If it were me, I'd be looking at something like 2000uF or more for each capacitor with at least 60V working voltage (based on the 48V power supply). (Would be good to see what value are actually used.) I'd also be looking for a low ESR to allow big current surges to pass.
--- End quote ---
Had a look at the Open Pinball Project and for their power filter board they have specified 8.2mF - which is 8,200uF - at 63V for each of these 3 capacitors. They also give a Mouser part number: 598-SLPX822M063H5P3. This capacitor has an ESR around 0.05 ohms, which seems appropriate to me.
Raymond175:
--- Quote from: Brumby on May 29, 2019, 01:53:23 am ---
--- Quote from: Brumby on May 29, 2019, 01:26:09 am ---If it were me, I'd be looking at something like 2000uF or more for each capacitor with at least 60V working voltage (based on the 48V power supply). (Would be good to see what value are actually used.) I'd also be looking for a low ESR to allow big current surges to pass.
--- End quote ---
Had a look at the Open Pinball Project and for their power filter board they have specified 8.2mF - which is 8,200uF - at 63V for each of these 3 capacitors. They also give a Mouser part number: 598-SLPX822M063H5P3. This capacitor has an ESR around 0.05 ohms, which seems appropriate to me.
--- End quote ---
I had to search quite a lot for the information you mentioned, but I have found the page with Mouser part numbers! That is a great help for me at this stage.
Although the Open Pinball Project doesn't use fuses, and I don't know if I even need them... what do you think?
Brumby:
Fuses are cheap and easily replaceable. If they blow, it will be for a reason and will usually save you from a more expensive failure.
Kjelt:
--- Quote from: Raymond175 on May 28, 2019, 08:30:50 pm ---my problem is really the sudden draw, which can be from one, two (e.g. flippers) or even six (flippers, kickers, magnets, multiball, etc.) high voltage coils at a time.
This actual power supply that I'm using was recommended by the pinball community. I'm aware of the old power supplies used in the original pinball machines, but these are actually very hard to get, as they seem to not being manufactured anymore.
--- End quote ---
That problem is only for the HV supply since that powers the coils and relais.
Yes you can use the proposed switch mode power supply (smps) BUT then you need a capacitor bank to buffer the peaks, that is what you are now doing.
A possible issue with this solution can be that the smps will oscillate.
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.
My suggestion was to build a normal standard powersupply from available components, not to buy a pinball power supply, just build your own.
The transformers can be get really cheap 2nd hand and the rectifier are also not the costs. The capacitors are expensive but you were going to buy them for your buffer anyway.
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