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Power Supply Soft Start Board (V3)
Power Supply Soft Start Board (V3)
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Old 28th October 2017, 09:32 PM   #251
brian92fs is offline brian92fs  United States
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Power Supply Soft Start Board (V3)
Thanks guys!
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Old 28th October 2017, 10:41 PM   #252
TonyTecson is offline TonyTecson  Philippines
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Power Supply Soft Start Board (V3)
http://www.mouser.com/ds/2/18/AAS-92...web-850596.pdf
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Old 31st October 2017, 06:03 PM   #253
reedcat is offline reedcat  United States
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Quote:
Originally Posted by reedcat View Post
What would be the effect of replacing the R3-R6 resistors with a CL-60? Will it make the board safer to operate (e.g in case of relay failure)?
I have 2 left over boards for the Soft Start with room for 4 CL-60 thermistors serially connected instead of 4 power resistors as in the original board. The rest of the schematics is the same and the PCB uses the same BOM as the one sold in the store (except for external connectors - see the pictures). I will sell these at cost ($12 + shipping). Please PM if interested.

Here are pictures of the board (before I assembled it and after) mounted on top of the Universal PSU. The PCB dimension is the same as one section of the Universal PSU with rectifiers (55mm by 75mm) and mount holes are drilled at 40mm by 60mm to match those in the Universal PSU. Selling boards only, not the parts. Usual legal disclaimers apply.
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Old 26th January 2018, 11:22 AM   #254
Tintino87 is offline Tintino87
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Hello, I see here that C1 (C9 on the link) must be 0.01uF 250VAC Y1 capacitor.
On the V3 version in BOM I read 0.01uF 1KV Radial Ceramic.

1) Why and which use ?

2) I read on this reply on this post
"C1 is in the wrong place.
As shown it bypasses the switch, so that you can never switch off your equipment !"

Who is right/wrong ?

Thanks !
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Old 26th January 2018, 02:50 PM   #255
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Tintino87 View Post
Hello, I see here that C1 (C9 on the link) must be 0.01uF 250VAC Y1 capacitor.
C9 and C11 must be rated for mains use. X1 or X2 when between Live and neutral, Y1 or Y2 when live to protective earth or Neutral to protective Earth.
Quote:
On the V3 version in BOM I read 0.01uF 1KV Radial Ceramic.
DO NOT use non mains rated capacitors on the mains.
Quote:

..................

2) I read on this reply on this post
"C1 is in the wrong place.
As shown it bypasses the switch, so that you can never switch off your equipment !"

.............
Can I be biased and state that I must be right. Because I read it on the internet.
But just look at what the switch + parallel capacitor does.
They are in parallel !
One bypasses the other.
If only one is active then mains current will pass through !
Is that not obvious?

And that prompts my final comments.
If you can't see that, then you are not competent to work with mains electricity.
Until you have learned how to correctly and safely wire up mains power get some competent help, at least to look over your shoulder.
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Last edited by AndrewT; 26th January 2018 at 02:56 PM.
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Old 2nd February 2018, 01:22 PM   #256
rock12 is offline rock12  United States
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I have read the whole post and many diagrams and pics are missing. My ? Is proper hook up to power. I have 120 wall power to the switch that came from the Diy store with case kit after the switch the ground is wired to the case bottom making a star ground which is also wired to ground of the universal psu then one of the hot wires connects to neutral the other hot wire to live/sw1 on the soft start is this correct. And what is sw2 for?
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Old 2nd February 2018, 11:55 PM   #257
TonyTecson is offline TonyTecson  Philippines
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Power Supply Soft Start Board (V3)
Quote:
Originally Posted by Tintino87 View Post
Hello, I see here that C1 (C9 on the link) must be 0.01uF 250VAC Y1 capacitor.
On the V3 version in BOM I read 0.01uF 1KV Radial Ceramic.

1) Why and which use ?

2) I read on this reply on this post
"C1 is in the wrong place.
As shown it bypasses the switch, so that you can never switch off your equipment !"

Who is right/wrong ?

Thanks !
i will place Ci right at the switch contacts, it is used to suppress the arcing of switch contacts when the switch is turned off. i use disk ceramic caps rated for 2kv, but 1 kv is also fine, not more than 0.01ufd or else you may find that even when switched off, your led panel lights may still be on..

mains rated caps are so called because of their self healing properties, the caps themselves have no idea where they are used in, as long as dielectric breakdowns are never exceeded, they will just be fine...

i even used those mains rated caps as coupling caps in a tube amp and no one can tell the difference...

capacitor safety mandates the use of properly voltage rated caps...
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Old 6th February 2018, 02:43 PM   #258
coolnose is offline coolnose  Europe
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Default Delaying switching time

Hi All,

I just tested my softstart boards (1 x V2 and 1 x V3), both are fitted the same.

C2 = 220nF X2 275V
C3 = 1000uF 50V

R1 = 220R 3W
R2 = 1M 3W

I am on 240V mains, with C2 = 220nF the relay never turns on. I increased C2 to 330nF and it works like a charm, but I find the delay somewhat short... I'd say less than 1/2 second.

Testing is without load, i.e. no transformer, no PSU/Caps.

I could try to trigger the delay on scope to have exact figures.

Will the delay change under load ? Should I test with at least Xformer and next step with PSU ?

Increasing C3 should give a longer delay , no ?

Thanks all in advance for your input !

Cheers,

Max
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Old 6th February 2018, 02:57 PM   #259
6L6 is offline 6L6  United States
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Power Supply Soft Start Board (V3)
1/2 second is about right. It's enough to keep the inrush current limited when the filter capacitors are empty and appear a dead short. Just a bit of charge makes the inrush quite a lot less.

The other neat trick you can do on this board is run the LED really bright - or better yet, use a higher current LED - as the location of the LED drains the capacitor during it's charge period, the brighter the LED (because brightness is controlled by current) the more delay you can add.
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Old 6th February 2018, 03:08 PM   #260
coolnose is offline coolnose  Europe
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6L6,

thanks for your input. I'll give it a try as is to see how it works under load.

Couldn't one play with R1 (220R) to alter the time constant ?

Cheers,

Max
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