Difference between revisions of "Power Supply with an ATX PSU"

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[[Category:Ongoing_Projects]]
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[[Category:Closed_Projects]]
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= Status =
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On going...
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= Description =
 
= Description =
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Create a lab Power Supply with an ATX PSU
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Create a lab Power Supply from an [https://en.wikipedia.org/wiki/Power_Supply_Unit_%28Computer%29 ATX PSU].
  
 
= Components =
 
= Components =
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= Those interested =
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= People involved =
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Fred
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*Fred
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speredenn
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*Speredenn
  
 
= Links =
 
= Links =
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http://www.sinux.net/2011/09/alim-atx.html
 
http://www.sinux.net/2011/09/alim-atx.html
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 +
http://www.instructables.com/id/How-To-Build-A-Power-Supply-For-Electronics-Hobby/
  
 
= Pictures =
 
= Pictures =
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[[File:PSU_4.JPG|200px]]
 
[[File:PSU_4.JPG|200px]]
  
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= Update =
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= Update: PSU with regulate output =
  
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It is a better idea to have the ATX set up in a box and to use the ATX connector to connect to the banana plugs. Basically, it is then possible to have the 5 usual plugs (GND, +3.3, +5, +12, -12) and add a regulated output (0-12V). The visualization for that regulated output can be analogical.
+
It is a better idea to have the ATX set up in a box and to use the ATX connector to connect to the banana plugs. Basically, it is then possible to have the 5 usual plugs (GND, +3.3, +5, +12, -12) and add a regulated output (0-12V). The visualization for that regulated output can be analogical. However, if the system uses a micro-controller (see Buck converter below), a digital screen could be an option. That would also be great to have a current limiter on that regulated output.
  
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That would be great to have a current limiter on that regulated output also.
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Linear regulators are excluded for this improvement because they dissipate way to much energy. A [https://en.wikipedia.org/wiki/Switched-mode_power_supply switch-mode power supply] approach is favored. So far, a [https://en.wikipedia.org/wiki/Buck_converter Buck converter] is considered.
  
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It might be possible to use a LM317 for the voltage control.
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= Options =
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I suppose it is good to have at least 2 LEDs, a red and a green, each with a 220Ω resistor in series. turning on the PSU can be done with a SPDT switch, that is: ''on1 - on2.''
 +
* red LED is between ''on1'' and purple (standby 5V)
 +
* green LED is between grey (power OK) and ''on2'' (or GND, for that matter)
 +
* green cable is soldered onto ''on2''
 +
* middle point of the SPDT switch is on GND
  
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We can use an ATX 24-pin connecor adapter to connect the PSU: http://tinyurl.com/6bza3o7
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this has the following consequences:
 +
* when PSU is on mains and switched off, the red LED is on
 +
* when flipping the switch, PSU turns on ; after about a second the green LED lights, indicating all is good.
 +
 
 +
I feel like wasting time, so here's some crappy ASCII art for this:
 +
 
 +
green-----------------
 +
            (grn)    |
 +
grey----R----|>|--o  o--------ON2
 +
                  |          /      ←{ this here is the SPDT switch }
 +
GND---------------o--------o/
 +
            (red)
 +
purple--R----|>|--------------ON1
 +
 
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= Components =
 +
 
 +
{| class="wikitable" style="text-align:left;"
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|+
 +
|-
 +
! scope=col | Shop
 +
! scope=col | Article N°
 +
! scope=col | Description
 +
! scope=col | Unit price (CHF)
 +
|-
 +
|Distrelec
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|[https://www.distrelec.ch/c%C3%A2ble-alimentation-atx-20-cm-24p-nt-20p-mb/maxxtro/aa-150-0613/679017/informatique/fr 679017]
 +
|24-pin (NT) – 20-pin (MB)
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|12.-
 +
|-
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|Distrelec
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||[https://www.distrelec.ch/borne-ronde-%C3%B8-4-mm-gris-clair/ritel/24-15-001/100536/fr 100536]
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|Laboratory socket light-gray ø 4 mm
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|4.-
 +
|-
 +
|}

Latest revision as of 14:54, 4 February 2012


Description

Create a lab Power Supply from an ATX PSU.

Components

Shop Article N° Description Unit price (CHF)
Distrelec 100538 Laboratory socket black ø 4 mm 4.-
Distrelec 100540 Laboratory socket red ø 4 mm 4.-
Distrelec 100546 Laboratory socket green ø 4 mm 4.-
Distrelec 100544 Laboratory socket yellow ø 4 mm 4.-
Distrelec 100542 Laboratory socket blue ø 4 mm 4.-


Price

Depends of connectors number and of availability of an old working ATX PSU.

Voltage

  • +5VDC
  • +3.3VDC
  • +12VDC
  • -12VDC


People involved

  • Fred
  • Speredenn

Links

http://www.semageek.com/diy-transformer-une-alimentation-atx-en-alimentation-de-laboratoire/

http://pinouts.ru/Power/atxpower_pinout.shtml

http://www.sinux.net/2011/09/alim-atx.html

http://www.instructables.com/id/How-To-Build-A-Power-Supply-For-Electronics-Hobby/

Pictures

PSU 1.JPG PSU 2.JPG PSU 3.JPG PSU 4.JPG

Update: PSU with regulate output

It is a better idea to have the ATX set up in a box and to use the ATX connector to connect to the banana plugs. Basically, it is then possible to have the 5 usual plugs (GND, +3.3, +5, +12, -12) and add a regulated output (0-12V). The visualization for that regulated output can be analogical. However, if the system uses a micro-controller (see Buck converter below), a digital screen could be an option. That would also be great to have a current limiter on that regulated output.

Linear regulators are excluded for this improvement because they dissipate way to much energy. A switch-mode power supply approach is favored. So far, a Buck converter is considered.

Options

I suppose it is good to have at least 2 LEDs, a red and a green, each with a 220Ω resistor in series. turning on the PSU can be done with a SPDT switch, that is: on1 - on2.

  • red LED is between on1 and purple (standby 5V)
  • green LED is between grey (power OK) and on2 (or GND, for that matter)
  • green cable is soldered onto on2
  • middle point of the SPDT switch is on GND

this has the following consequences:

  • when PSU is on mains and switched off, the red LED is on
  • when flipping the switch, PSU turns on ; after about a second the green LED lights, indicating all is good.

I feel like wasting time, so here's some crappy ASCII art for this: 

green-----------------
            (grn)    |
grey----R----|>|--o  o--------ON2
                  |          /      ←{ this here is the SPDT switch }
GND---------------o--------o/
            (red)
purple--R----|>|--------------ON1

Components

Shop Article N° Description Unit price (CHF)
Distrelec 679017 24-pin (NT) – 20-pin (MB) 12.-
Distrelec 100536 Laboratory socket light-gray ø 4 mm 4.-
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