Batteries & Chargers - How to convert an ATX power supply to rc use - Please excuse the slight thread creep, but I wanted to know if there is a commercially available product or a step-by-step DIY to make a DC-to-DC converter to change the +5VSB output … I really appreciate it. Copy link. So the decision was easy. Share. Shopping. Originally this PSU had not such protection circuits for any of its outputs. This resistor is connected between the Source of the main MOSFET and the negative of the primary side. SLLEA 16V AC/DC Adapter Charger for Model IMW645 Bluetooth Speaker Power Supply Cord Cable PS Battery Charger. A smart battery charger will not only never overcharge cells, but can also monitor battery temperature, switching off a fast charge when certain parameters are exceeded. In most cases, this will entail connecting the coax-to-battery adapter's red and black wires to the same-colored outputs on the battery and then screwing the coaxial cable from the power supply into the coaxial output on the adapter. The PWM IC used in this PSU was the TL494, well known for decades now. I already had the good news that the primary switchers were intact. document.getElementById("af-footer-413914580").className = "af-footer af-quirksMode"; Twist them together tightly or use a crimp connector (ring terminal, spade terminal, etc) and connect to the amp’s power & ground terminals. a need to load both of the two main outputs (5 and 12V) at the same time. No covers, no cooling fan etc. Everyone sometimes needs an adjustable power supply. In that case, it's better to put a 10 Ohm, 10/20 Watts resistor in series with the 12 V output, in order to not overload the power supply. Convert a Computer ATX Power Supply to a Lab Power Supply. I had forgotten a device plugged in to my 12 V cigarette lighter/power utility port overnight and through the next day while it was in my garage. Standby power. $43.99 $ 43. Removing power from the 12V battery wire means the unit will lose its radio tuner settings, audio settings, and any other adjustments you’ve made. So.. One evening I found myself in quite a pickle. the voltage of the resistive divider is 2.5 V). A wide variety of atx power supply battery charger options are available to you, such as port, certification, and type. After this modification,
Panel Replaced In SONY BRAVIA LCD TV MODEL KLV-32BX300 After All Cutting Tricks Failed, Distorted Sound In An Active Speaker Repaired, E2 Error Solved In ADELI Induction Cooker MODEL NO.AL2000-A1, Completed Another Higher Advanced Electronics Repair Course, Replacing LCD Tubes With LED Strips In HCT TV/MONITOR Model Number HLD-150MDP, 40 Inch Samsung LED Television Hit By Power Surge Now Repaired, White Display In Dell Inspiron Laptop Repaired. if (document.getElementById("af-footer-413914580")) { Then I had the idea! convert atx power supply to car battery charger. Thank you also for the photos you sent me about the voltage level detector/protection circuit. FREE Shipping by Amazon. There's a dangerous lethal mains voltage inside the power supply. Your email address will not be published. There are some ATX power supplies, which use so-called single switch forward topology
BATTERY CHARGERS AS POWER SUPPLIES. Start with 7 V at the bench power supply. -->, ATX PSU modified into a car battery charger- part 1. Best Offers Fast Shipping However, while that’s very easy, it comes with a price. Just click the second part and see it. Computer power supply is definetly not designed to be connected to battery. If the TL431 has the anode resistor (in the picture it is 22R), short it. If you connect it to computer power supply - you may feed power supply with energy. $10.99 $ 10. That was good news, as I realized that it had a “not starting” problem. As I recall the first time I saw this chip was back at the beginning of the eighties. How to charge lead acid battery with power supply. In other words I removed all the components related to the +5V and +3,3V outputs along with anything related to them and I saved these components as spare parts for future repairs. If you hardwire the accessory wire to the yellow wire (battery power), you can turn the car stereo off with the power supply on/off control. 99. So, I had to increase the voltage output of this PSU…. Mini-ITX does not standardize a power supply. })(); Batteries & Chargers - How to convert an ATX power supply to rc use - Ok guys I am heading to radio shack to pick up a few 10/10 resistors and a few 10/1 resistors. Turn off the charger power switch to the off position. @*/false; Turns out that the one I bought has a "safety feature" that requires it to detect voltage at the other end before it turns on the juice. Hopefuly you can build your own charger! [CDATA[ 1 Introduction Computer equipment is often made redundant before unit The first was the output voltage. Great Repair Article From the reference pin (R) resistors go again to the ground, +5V and +12V. Not all chargers are suitable for power supply operation. But it didn't work as expected. Please leave it in the comments. This is the optocoupler, which provides the standby function. Inappropriately modified power supply can be dangerous. // ]]> Well, some days ago, I had a phone call from my younger brother Aristos. Batteries & Chargers - How to convert an ATX power supply to rc use - I am in need of a ps that can put out more that 20 amps. BESTEK 500W Power Inverter DC 12V to 110V AC Converter with Alligator Battery Clamp 4.8A Dual USB Car Charger ETL Listed . i do agree with you that a PC power supply will not be able to function as a battery charger, but not because it will overcharge the battery. Your email address will not be published. Batteries & Chargers - How to convert an ATX power supply to rc use - ORIGINAL: OldRookie Try this one. Computer power supplies are intended to run with some load on the 5V or 3.3V rail as well though, so depending on the model you might have a reliability problem. You can see the almost naked secondary side of the PCB along with the components I removed, below: However I had two basic problems to solve. Required fields are marked *. More Buying Choices $38.71 (4 used & new offers) BESTEK 2000W Power Inverter 3 AC Outlets DC 12V to 110V AC Car Power Converter for Camping Outdoor Power Supply ETL Listed. An adjustable resistor divider is seen in the schematic below. Thank you for your kind words. My brother on the other hand was very demanding! is introduced via optocouplers. The actual IC was an equivalent version of that TL494. This is useful when you want to charge or cycle a battery pack at home on the bench. Buy Car Power Supply online at Paytmmall.com. $10.98 $ 10. In addition I “scanned” all the electrolytic caps for bad ESR. Mr Paris. } Depending on design of that power supply - bad things can happen. Entre e conheça as nossas incriveis ofertas. Save money by converting the cheap ATX power supplies that can be found in any discarded computer. https://jestineyong.com/atx-psu-modified-into-a-car-battery-charger-part-1 You can use your power supply 12V output as a car battery charger! 98. This design for an external adapter lets you use the power supply without modifying it. Well, all I am doing is convincing every time myself that somehow there is no garbage in electronics...At least not all of any failed equipment which is available. He wanted not only the boost charge function, but also the “maintenance” or “floating” one. You just need to take the green wire from the motherboard connector and connect it to any one of the bleck wires. I left only the +12V output circuitry there. I suppose nobody will have problem to find this resistor. Save my name, email, and website in this browser for the next time I comment. You can see below its final shape, after having completed all the modification work. } ATX PC power supply made into car battery charger - YouTube All it was a populated PCB only. With features that are more or less hit or miss for what you need. So I went out and bought one. WARNING !!! It was a μPC494 made by the Japanese company NEC. The second problem to be solved was the obvious need for an inclusion of a current limit protection in it, which would protect it against overloading and also against any accidental short circuiting of its output cable clamps before connecting them to the battery to be charged. He was explaining to me about some trouble he had with his car, specifically with a malfunctioning switch which recently left him with a totally flat battery, early in the morning, while he had to leave for work… During the discussion he started asking me about details in order for him to decide about buying a good car battery charger. In this Instructable, I will show you how to convert a computer power supply into a regular DC power supply with 12, 5 and 3.3 v… We provide an overview of the ATX power supply before describing how the power supply may be modified into a battery charger alongside experimental results. When I went to get the device I had noticed that the car's battery was completely drained. (function() { 4.6 out of 5 stars 34. It's available. This article was prepared for you by Paris Azis from Athens-Greece. The typical voltage used in cars is 14,4V. if (!IE) { return; } In that case, it's better to put a 10 Ohm, 10/20 Watts resistor in series with the 12 V output, in order to not overload the power supply. I was very lucky so far and things seemed to be much easier now. This is the one I use, and I use my computer power supply that I … Is there any reason why a car battery + battery charger would not be a good bench power supply for stepper motors (given the need for straight 12V power, obviously the complexity increases when you must supply other voltages). You should also put in a couple load resistors to make sure that the power supply … $191.99 $ 191. shuts down when in short circuit - it enters into a current limiting mode. Some months ago a friend of mine gave me a main board of an old defective ATX PSU, just for me to use it as a spare parts source. Any ATX power supply can be plugged into the adapter. There are situations where a battery charger may need to function as a power supply, as well as maintain batteries. Once you know how a device or a certain block in a process works you can follow the signal flow , and eventually you can repair and redesign any device . In my case there was 0R15 resistor rated 2W, it should be replaced with around 0R27 to 0R51. A potentiometer regulates the voltage from 3 to 15 V. The potentiometer can be replaced by
This resistance can also set the output current in case you modify the Nothing relevant found by the measurements. Info. He started as a hobbyist at the age of 12 years and ended his professional carrier as a senior electronics technician. This resistance can also set the output current in case you modify the supply into a battery charger (for 12V car battery the voltage is set to about 14-15V and the current is set corresponding to the battery). That's pretty common. You do everything on your own risk. 10Pcs Boost Step Up 5V 1A Power Supply Module Lithium Battery Charge Protection Board 134N3P DIY Charger USB and Micro USB Port with LED Display. A little higher price, but you are guaranteed that it is manufactured, and carries the Meanwell brand name. The voltage feedback is connected to pin 1 of TL494 control chip
The reference voltage is 2.5 V (i.e. It's very easy to make a very poerfull charger for car battery, uoy need a At or ATX Power supply with a especific power controller circuit: The TL494 or equivalent (DBL494, IL494, GL494, SL494, KIA494 OR KA7500). but because it of its low voltage output. Get it as soon as Wed, Apr 7. Feedback
Get it as soon as Wed, Apr 7. Their disadvantage is a poorly regulated output voltage and often
99. Descubra a melhor forma de comprar online. } The result is a high capacity power supply that can output 3.3V, 5V, 12V and -12V. This can be when designed into a UPS (Uninterruptible Power Supply), or when testing or operating a DC system powered by batteries. Watch later. modify the supply into a battery charger (for 12V car battery the voltage is set to about 14-15V and the current is set corresponding to the battery). The ATX supply fan can be connected to the 5VSB so that it is not affected by the voltage adjustment. Have a look at the UC2842 IC datasheet; there's a "cheapie" flyback converter shown which outputs +12v/-12v and 5v, but it's not really a true regulated supply. Good work , I'm impressed with Your ingenuity.This reminds me of what I learned years ago when I was a consumer electronics student . I have read the posts but to me the information gets jumbled I will follow the initial guide but m question is what would be the if (document.getElementById("af-header-413914580")) { FREE Shipping on orders over $25 shipped by Amazon. That way, you’ll never miss a post. Buy the best and latest convert pc power supply to car battery charger on banggood.com offer the quality convert pc power supply to car battery charger on sale with worldwide free shipping. Originally the feedback is connected to both 5 and 12V outputs and
After this modification the supply no longer
Batteries & Chargers - How to convert an ATX power supply to rc use - thanks, so i can't connect the white to white wire and the black to black without this special switch so its on whenever the power supply is plugged in? 3.5 out of 5 stars 17. A regulated 12V power supply with 20A out isn't that hard to come by - many computer power supplies could handle it fine. convert atx power supply to car battery charger - YouTube. There's usually UC3843 and is on the primary side. The up side is that it will only … But I am a very good 'copier' and perhaps emulate it in my own crude way! However ATX power can only supply up to 13.8 volts because they have more internal regulators, which for security reasons avoid output voltages over 13.8 volts. Hi Paris, I confess this article is very interesting, and I'm very eager for seeing Part 2. a fixed resistor to set a constant voltage if needed. That was also a good sign. })(); Jan 31, 2015 - Computer power supplies cost around US$30, but lab power supplies can run you $100 or more! In these supplies there's no TL494 chip. May 20, 2017 - Encontre Carregador De Bateria 12 Volts Automotiva Carro Moto Atatx no Mercado Livre Brasil! The first order of business is that of safety. You can use your power supply 12V output as a car battery charger! it works well only when both outputs are loaded. Nov 5, 2019 - Convert an old computer ATX power supply to a highly-capable workbench power supply. Share. This is done by shorting the emitter and collector of one of the optocouplers (there are a total of 3-4). Even a total dismantle of it in order to get healthy spare parts out of it is worth the effort (I believe). Most modern power supplies (atx and newer) need to be 'triggered', meaning that voltage is not present immediately when the supply is plugged in. Then he joined the telecoms industry, working for 20 years as field supporting technician in the sector of DMRs (: Digital Microwave Radio transmission stations), ending his carrier with this subject. Now was the time for dynamic checks. the circuit regulates the output voltage so that
13.8 battery backup module : 27: 24 volt power supply convert 13.8 : 28: 5 volts to 13.8 volts : 29: regulated 13.8 volts dc : 30: 13.8 pc power supply : 31: 13.8 v dc = 12 v : 32: atx 13.8v car : 33: how to step down a power supply from 18 volt to 13.8 volt : 34: 13.8 volt cigarette lighter : 35 Just for confirmation that this side was trouble-free too. Home > ATX Power Supply Repair > ATX PSU Modified Into a Car Battery Charger-Part 2. Otherwise there is no charging at all. We provide an overview of the ATX power supply before describing how the power supply may be modified into a battery charger alongside experimental results. document.getElementById("af-header-413914580").className = "af-header af-quirksMode"; document.getElementById("af-body-413914580").className = "af-body inline af-quirksMode"; You can also forward this website link to your friends and colleagues-thanks! Removing power from the 12V battery wire means the unit will lose its radio tuner settings, audio settings, and any other adjustments you’ve made. If you tried to convert an ATX supply to a battery charger, you'd have a built-in inefficiency, as the 5v supply needs a load in order to regulate the 12v supply. You can use an old personal computer power supply to run your direct current RC battery charger. I checked all the voltages around the pins of this IC, in order to locate a possible “output inhibit” condition. Connect it to black (0V) to turn the supply on. This connector has a number of independent supplies for 3.3V, 5V, and 12V. At that time I was so amazed by the way this power supply worked, after I had repaired it, that I bought some pieces of this chip in order to start experimenting with it…First love…never forgotten…This chip introduced me in the magic world of the SMPSes…Those were the days…. Computer power supply is definetly not designed to be connected to battery. A power supply used as a charger cannot do this, and will continue to pump energy into a battery regardless of its condition; fully charged, battery fault, or shorted cells. It is obvious to me, reading the last phrase of your comment, that "you've got the idea". … Let me be very frank; I can never venture to do anything like this on my own, because of limited knowledge in Electronics! Now he is a hobbyist again! Plug your power supply into the battery. (function() { Aug 30, 2017 - How to Make a Car Battery Charger With At/ATX Power Supply: It's very easy to make a very poerfull charger for car battery, uoy need a At or ATX Power supply with a especific power controller circuit: The TL494 or equivalent (DBL494, IL494, GL494, SL494, KIA494 OR KA7500). Wiring the Power Supply Up. an adjustable bench power supply of 3 - 15V with a proper regulation and an output current corresponding to the original 12V output. While I'm reasonably … As you know, in order to charge a 12V car battery one needs a slightly higher voltage than that. Your feedback on the post is welcome. www.nmia.com/~tandberg/LinkedPages/SailplaneArticles/PowerSupplyATX_0… Using an ATX (desktop computer) power supply for a car amp isn’t hard usually. This will "turn on" the power supply… Be careful, though: if your battery is too discharged, the power supply short circuit protection will trigger. Therefore I had to take this requirement in account and provide him with two switchable output voltages. In my case there was 0R15 resistor rated 2W, it should be replaced with around 0R27 to 0R51. He is 59 years old and has more than 30 years’ experience in electronics repairs, both in consumer and industrial electronics. To see what was wrong with that PCB I had available and instead of using it as a spare parts source I could possibly restore it and afterwards modify it making of it a 12V car battery charger for my brother. At that time I joined the Panasonic servicing staff here in Athens-Greece. https://www.homemade-circuits.com/atx-ups-with-charger-circuit Shopping. Learn how your comment data is processed. If your board takes 12V, then yes, you need a DC-DC converter that converts the battery voltage to 12V. Build an essential piece of equipment for next to nothing! document.getElementById("af-form-413914580").className = 'af-form af-quirksMode'; Use a bench power supply with adjustable output and a couple of rectifier diodes (something rated at 3-4 A). standard ATX power supply found in many desktop computers into a 12V battery charger. Be careful, though: if your battery is too discharged, the power supply short circuit protection will trigger.