ATX-compatible computer power supply for the car. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices

 Comments on the article

ATX form factor power supply circuit, when using a car battery.

This article discusses a diagram of a home-made power supply that can support the performance of modern ATX format motherboards and computer peripherals when using a + 12V car battery as an energy source.

The design was based on the scheme published on the website carmp3.nm.ru. However, the specified power supply could only work normally with the old M / B format AT, since it produced only voltages of ± 12V, + 5V and the Power_Good signal. -5V is required for some boards based on nVidia chipsets (I don't consider the old ISA specification due to being out of date), +3.3V for normal operation of the P4 processor. A mechanism for advanced power management was also implemented (now you can turn on and off the B / P remotely, by a signal from the M / B).

Rice. 1. Schematic diagram of B/P (click to enlarge)

The basis of the B / P is PWM (TL494 or analogues). Two MOSFETs switch the 12V DC voltage from the battery to the pulse transformer TR1. The output voltages are taken from the secondary windings, after being rectified on half-wave rectifiers D3-D12, after which they go to the common inductor DR1 and to the individual L-filters DR2-DR6.

Only the voltage + 5V is stabilized, the rest - indirectly. The feedback of the stabilizer is obtained from a programmable reference voltage source TL431, the output part of the circuit is decoupled from the input optocoupler PC817.

The inclusion of the B / P in the on-board network, as well as the processing of the PS_ON signal of the remote control, is carried out by the control circuit on transistors Q1-Q2 and relay RL1. For reliable operation of the relay, it may be necessary to select the values ​​​​of the resistors R1-R2.

Standby voltage + 5V_SB is generated by the integral stabilizer KR142EN5 (or imported analogue 7805). This voltage is always present while the terminal is connected to the battery, so the microcircuit must be installed on the heat sink.

Rice. 2. PCB topology (click to enlarge)

Structurally, the B/P is made on a single-sided printed circuit board measuring 85 × 95 mm; the view from the side of the parts is shown in fig. 2.

Rice. 3. Photo of the finished structure

The transformer is wound with a single-core copper wire in varnish insulation with a diameter of 1 mm. in 2 threads, i.e. the total cross section was about 1.5 mm2. Ferrite grade M2000NM1-36, size 45x27x12. Black rag electrical tape was used as insulation for the windings (as luck would have it, there was no varnished cloth at hand). The winding order is as follows: the primary winding is tightly wound on the insulated ferrite with a double wire in 2 braids of 6 turns each. The end of the first is connected to the beginning of the second, this will connect to the +12V battery (point #3 in Fig. 2). The free ends of this winding will be connected to transistors Q1 and Q2 (points #1 and #2 in Fig. 2). Next, a layer of insulation is wound, and the secondary windings are laid. The secondary winding is also symmetrical, consists of 2 halves. Each of the halves, in turn, consists of 2 segments of 8 and 6 turns. Both halves are connected by the free ends of 2 6-turn windings (ground or accurate #4 in Fig. 2). From the joints of 8 and 6-turn windings, ± 5V is removed, taps are made (points # 7 and # 8 in Fig. 2). From the free ends we remove ± 12V (points # 5 and # 6 in Fig. 2). The winding for + 3.3V is wound on top, after the insulation layer. It consists of 2x7 turns (two halves, 7 turns each), connected to ground by the middle part (exactly #4 in Fig. 2). Rise ends - to points #9 and #10 in fig. 2. All windings, of course, wind in one direction. Because it is very difficult to solder such a bundle of thick wires; the winding outlets, together with a flexible mounting wire, were crimped with copper sleeves.

The common choke DR1 is taken from the computer B / P, DR2-DR6 - from there. Diodes D3 D8, D11 D12, and D5 D6 - in the TO220 package are also soldered from the computer power supply. The remaining rectifier diodes are Schottky diodes for a current of 5-7 A. The optocoupler is also removed from the same B / P, can be replaced with any similar one.

Relay - any 12V and switched current 20-40 A. I took a relay from a car alarm. Diodes D1 and D2 are also any, as long as they are suitable for current.

Diodes, field-effect transistors and an integral stabilizer are installed on the radiator through insulating gaskets. The value of the operating current of the protective fuse is selected experimentally, based on the power of the existing load. After debugging, it is desirable to pour the entire circuit into a compound or epoxy resin in order to prevent corrosion and mechanical damage to the B/P.

Author: Alexey Kazakov (Alex K); Publication: cxem.net

See other articles Section Automobile. Electronic devices.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive Fidget Cube gadget will wean you from bad habits 01.10.2016 At first glance, Fidget Cube from Antsy Lab (which means "restless laboratory") is completely useless. Built into a small vinyl cube is a spinning wheel, a switch, three gears, a push ball, and even a joystick, but all these "controls" don't control anything. The novelty is suitable for those who like to click with a ballpoint pen and bite their nails. Fidget Cube is designed to help you cope with bad habits. This little vinyl cube raised 253 times more money on Kikstarter than the developers originally wanted. The Fidget Cube is designed in such a way that playing with quiet and loud buttons should be pleasant to the touch, but will not disturb anyone in the vicinity. This idea is not absolutely stupid: almost every one of us occasionally clicks a ballpoint pen absently, causing a quiet annoyance of everyone who has to listen to it. However, playing with these things can improve concentration. Antsy Lab cites results from a study showing increased levels of concentration in students playing with a stress ball or improved attention in children with attention deficit hyperactivity disorder.

Other interesting news:

▪ More solar panels in Tokyo

▪ O formidable rocks are crushed with the roar of the wave

▪ Identification of the owner of a mobile phone by fingerprint

▪ Bacteria help produce nanomaterial for computers

▪ It's time to fly on hydrogen

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Amateur Radio Technologies. Selection of articles

▪ article Formwork with a clamp. Tips for the home master

▪ article How big is the universe? Detailed answer

▪ article Astrakhan Reserve. Nature miracle

▪ article Biofuel combustion plants. Burning wood waste. Encyclopedia of radio electronics and electrical engineering

▪ article Color-musical lighting. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages ​​of this page

Arabic	Hebrew	Polish
Bengali	Hindi	Portuguese
Chinese	Italian	Spanish
English	Japanese	Turkish
French	Korean	Ukrainian
German	Malay	Vietnamese

Home page | Library | Articles | Website map | Site Reviews

www.diagram.com.ua
2000-2024