Difference between revisions of "Power Supply with an ATX PSU"
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= Description = | = Description = | ||
| − | Create a lab Power Supply | + | Create a lab Power Supply from an [https://en.wikipedia.org/wiki/Power_Supply_Unit_%28Computer%29 ATX PSU]. |
= Components = | = Components = | ||
| Line 55: | Line 52: | ||
| − | = | + | = People involved = |
*Fred | *Fred | ||
*Speredenn | *Speredenn | ||
| Line 65: | Line 62: | ||
http://www.sinux.net/2011/09/alim-atx.html | http://www.sinux.net/2011/09/alim-atx.html | ||
| + | |||
| + | http://www.instructables.com/id/How-To-Build-A-Power-Supply-For-Electronics-Hobby/ | ||
= Pictures = | = Pictures = | ||
| Line 74: | Line 73: | ||
= Update: PSU with regulate output = | = 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. | + | 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 [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. | |
| − | + | ||
| − | + | ||
= Options = | = Options = | ||
| − | I suppose it is good to have at least 2 LEDs, a red and a green, each with a | + | 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) | + | * red LED is between ''on1'' and purple (standby 5V) |
| − | * green LED is between | + | * green LED is between grey (power OK) and ''on2'' (or GND, for that matter) |
| − | * green cable is soldered onto on2 | + | * green cable is soldered onto ''on2'' |
* middle point of the SPDT switch is on GND | * middle point of the SPDT switch is on GND | ||
| Line 90: | Line 87: | ||
* when PSU is on mains and switched off, the red LED is on | * 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. | * 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 = | = Components = | ||
Latest revision as of 12:54, 4 February 2012
Contents
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
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.- |
