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atx power supply dummy load resistor

The dummy load usually is put on the wire with most power. This is one of the things that is often omitted when building a 12 volt power supply that should always be included. Hello, I was thinking about building a load tester for atx power supplies and thought that I might be able to use a 555 timer to control a MOSFET, and sink the current to ground. To implement a variable dummy load, a variable voltage regulator LM317 connected as shown in the following diagram is used. I see what you mean. I own an ATX power supply with an unusual DR B2003 (marked as 2003) feedback regulator. ATX PSU as bench power supply. The first line represents the 12V load from motors only. A couple of questions come up when converting an ATX power supply regarding the dummy load resistor: Podcast Episode 299: It’s hard to get hacked worse than this. Don't forget to cover it with some tape, and place the resistor in the power supply case. How to use a variable dummy load for power supply testing? Second Problem is the Grey "Power good" Wire. This kind of dummy load is widely used in testing power supply. Most ATX-Bench supply videos I have seen they use those ceramic resistors for loads. The first step in the process is to open up the ATX power supply and identify a few key connections as well as determine what voltages the power supply currently generates. The DC output voltages shall remain within the regulation ranges shown in Table 2 when I am planning on converting an ATX PSU into a lab bench power supply, and I've seen plenty of videos and read numerous articles about how easy it is. How to make dummy load for ATX power supply 300W Is there any schematic to build power supply load to test 300W power supplies? I was saying that I have only a 1 ohm 5W rectangular ceramic resistor. … The best is … Thanks for contributing an answer to Electrical Engineering Stack Exchange! Some older ATX supplies won't start without some sort of load. Here is a simple solution using power transistor. Hi I'm reading up all the various youtube videos, websites, etc on converting a surplus PC ATX power supply to be a benchtop supply, and all of them note the ATX requirement for a dummy load between 5V and ground or the PSU will turn off. Could 1950s technology detect / communicate with satellites in the solar system? Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. Some ATX PSUs will supply power to the outputs without a dummy load resistor. In our experience most ATX supplies don't require a significant load on the 5 volt rail to start. for any steady state temperature and operating conditions specified in Section 5. Another option would have been to monitor the current drawn by the "real" load (ie. "grep string | grep string" with awk without pipe. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. In our experience most ATX supplies don't require a significant load on the 5 volt rail to start. @Anonymous the resistor shown in above pic connected to the supply is a 10 Ohm resistor. Asking for help, clarification, or responding to other answers. rev 2020.12.18.38240, The best answers are voted up and rise to the top, Electrical Engineering Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. ATX supplies are supposed to be well regulated. In one case, the load had to be applied to the 5v standby wire (purple) to ground rather than directly to the 5v rail to ground before the power supply would function properly. Increase up to 13.8V if possible. It’s . Some older ATX supplies won't start without some sort of load. As I understand it you shouldn't need one. Now we have 3 different Values for one Instruction. Allow bash script to be run as root, but not sudo. From what I know the Diodes had ideally zero resistence (almost zero) so it will be like a short circuit. @Hanno: See update. Some will shut down after few seconds (fan rotate for a while and stop) You can either use dummy loads like used motherboard, hard disk and even ATX power supplies tester to test out the power supply. Voltage dropping issue, Center with equal amount of text per line. It only takes a minute to sign up. Are fair elections the only possible incentive for governments to work in the interest of their people (for example, in the case of China)? Most ATX-Bench supply videos I have seen they use those ceramic resistors for loads. However, the better option is to just get a Haswell compatible PSU as they are better balanced due to the lower 5v draw from newer computer designs that rely less on the 5v rail, and dont shut down without a load. Is it wise to keep some savings in a cash account to protect against a long term market crash? Now solder Red and Black Wire across it. conditions. Add in a variable resistor (~10K) for test. PCB picture . The voltage regulation limits shall be maintained under continuous operation ATX Power Supply. Of course, I could have added an LED with current limiting resistor to each output, but I used the power supply's "power good" output instead. RC integrator: why does it convert a triangular wave into a sine wave? I don't have a 10W so I'm using two 10 Ohm 5W in parallel. You need the dummy load over the 5v rail, not the 12v rail that most fans run from. Power Supply Dummy Load. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. ATX power supplies ... (especially older ones), the voltage may become unstable or turn off unless there is a minimum "dummy" load. Dummy load in place. The first three show increasing 12V load with the recommended "dummy" 5V load of a 10 ohm 10W power resistor (i.e. A 10Ω 9W power resistor would be a reasonable choice if you want to play it safe. Question: this is considered a dummy load and in the video according to what rail draws the most amperage( in my case it's the five volt rail ) is where you place the dummy load to make the power supply stable during low current draws. An artificial load just wastes electricity and creates unnecessary heat. \$\endgroup\$ – RSB Apr 9 '17 at 18:43 Could 1950s technology detect / communicate with satellites in the solar system? Did the actors in All Creatures Great and Small actually have their hands in the animals? If you do choose to power this circuit via 12V, ... None the less, we wanted to remove other potential sources of this ripple from the equation and swapped the Dummy Load for a 4.7Ω 100W resistor. Unfortunately, this kind of high power resistor is expensive and not so flexible getting wide adjustment range. I have attached a 20 Ohm resistor to my Dell PSU on the 5V rail since its a 2004 PSU and most of the current is on the +3.3V & +5V rail. You should not need external load (unless practice shows otherwise). Making statements based on opinion; back them up with references or personal experience. Why does wprintf transliterate Russian text in Unicode into Latin on Linux? To learn more, see our tips on writing great answers. Identify location (and painter) of old painting. Looking for the title of a very old sci-fi short story where a human deters an alien invasion by answering questions truthfully, but cleverly, Center with equal amount of text per line, Reclassify raster values continuously instead of assigning them to specific groups. Below you'll see a table of voltage as measured under various loads for an old ATX PSU that has issues with unbalanced loads. Make a dummy load for a lower voltage DC power supply. Pete says: March 22, 2013 at 8:28 am. I have a new 500 W ATX power supply with a 30 A 5V rail that I am going to use to power 300 smart RGB LED Christmas lights for my tree this year. I want to make something that will properly load all lines so I can measure voltages and ripple of old power supplies and on that way determine if they are stable, accurate and have ripple under ATX standards. Interesting. Attach wires to allow addition of resistance. To make sure our Power supply output is stable we need to add a dummy load, add a 5 Ohm 10w resistor to it. I have a attached a poorly drawn schematic of what I plan to do. Magic smoke released from DIY PSU… but why? site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. MathJax reference. If your supply doesn’t require a 5-volt load on startup you can eliminate this. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. I had to put a load to make it works, I used a resistor 10ohms 25W. Could an extraterrestrial plant survive inside of a meteor as it enters a planet's atmosphere? "grep string | grep string" with awk without pipe. en.wikipedia.org/wiki/Power_supply_unit_(computer)#Testing, Podcast Episode 299: It’s hard to get hacked worse than this, ATX PSU +12V outputs connected in parallel, Charging a bank of batteries in series with a resistor, DIY ATX PSU turns off when attaching load on 12V rail. If I understand what you're asking. Asking for help, clarification, or responding to other answers. Note: An ATX power supply has a maximum output voltage usually of 12V. Your average 12 V 1 W fan on the 5 V rail usually cuts ut, but your milage may vary. Use MathJax to format equations. To use an ATX supply outside of a PC while preventing output voltage to run away at low/no load, can I just use a couple of diodes in series to provide some kind of voltage-dependent load? What makes representing qubits in a 3D real vector space possible? ... Well I could use a resistor but I didn't have many power resistors and when you start testing higher voltages and currents the resistors get really big! Is it wise to keep some savings in a cash account to protect against a long term market crash? measured at the load end of the output connectors under all line, load, and environmental If it wont meet specs under, Right. IMHO, ditch the diodes and use a power resistor as your dummy load. Depending on your power supply, the power resistor can become hot so make sure to use a heat sink and enough air flow to dissipate the heat. Hi there, instead of worrying about dissipating waste heat from the ballast resistor, I used it to heat the bed, meaning I could use a lower power 12V heater – double win. 8 Responses to ATX power supply 5V load resistor for better 12V regulation. @winny currently the dummy load (10 ohm) is connected to the 5V. There is a footprint for a 9 Watt 10ohm load resistor on the 5 volt rail. But if you tell me it needs 0.25 and 0.5 and 1 Amp I get confused. Without a load, it may shut down. I was saying that I have only a 1 ohm 5W rectangular ceramic resistor. Many, many years ago, IBM XT power supplies needed a dummy load or they wouldn't operate properly - they'd go into overvoltage shutdown, ... - 10w10ohm resistor on the 5v supply This supply also has a switch, so I didn't bother connecting an Hook up the supply as in the previous test and slowly increase the resistance from zero, while monitoring the voltage. And I think 1 Ohm resistor will just fry quickly as for 3.3 V there will be 3.3 A current and thus 10 W, for 5V there will be 5 A and 25 W. Edit: your resistor looks like 10 Ohm, not 1 Ohm?

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