Notes on the troubleshooting and repair of small switchmode. Whether you are an experienced power supply designer, designing your first switching power supply or responsible for a make or buy decision for power supplies, the variety of information in the switch. How switch mode power supply works smps troubleshooting. Switch mode power supplies smpss are used in a range of applications as an efficient and effective source of power. For countries that use the 220 to 240 vac, the dc voltage that you will get is about 300vdc and for countries that use 110120vac, the dc voltage that you will get is about 150 to 160 vdc. Repairing switchmode power supplies resource detail.
The definitive guide to switchmode power supply designfully updated. The electronic power supply integrated with the switching regulator for converting the electrical power efficiently from one form to another form with desired characteristics is. The various types of voltage regulators, used in linear power supplies lps, fall in the category of dissipative regulator, as they have a voltage control element usually transistor or zener diode which dissipates power equal to the voltage difference between an unregulated input. The dc voltage that you get is measured across the two pins of the filter capacitor using a multimeter. The shown unit is a cheap readymade chinese make smps circuit.
Switch mode power supplies smpss can be used to stepdown a supply voltage, just as linear supplies do. This application note, which is the first of a twopart series, explains the basics of different smps topologies. Topologies of switch mode dcdc converters, dc transfer functions, efficiency, devices, chokes and. The buck switching regulator is a type of switch mode power supply circuit that is designed to efficiently reduce dc voltage from a higher voltage to a lower. Due to prolonged usage and high temperaturs, the hv dc electrolytic capacitors can fail. How to repair a computer power supply or other switching. This reference manual contains useful background information on switching power. How to repair a switchmodepowersupply smps homemade. A switchmode power supply smps switches been fullyon and fullyoff states quickly to maintain voltage regulation.
Switched mode power supplies pdf 153p download book. Switchmode specialises in the repair of all power supply equipment often where technical information, support, spare parts andor test fixtures are. The power supply fault could be an open start up resistor only or could be even more than ten components burnt due to heavy lightning strike. This book covers switchedmode power supplies that you may encounter in modern consumer electronic products, and focuses on the most common supplies found throughout the industry. Apr 10, 2010 samsung power supply repair fix hpt5034 hpt5054 hpt5064 bn4400160a 162a 189a 190a bn44 dyp50w2 duration. Switch mode power supply high voltage power supply high current power supply linear power. Based in hornsby, sydney serving all australia and beyond. Jul 12, 2014 it is nice to have a backup plan procedure when the power supply cannot be repaired with its original replacement parts. Examples of power supply equipment that we regularly repair includes converters, amplifiers, rectifiers, ups, switched mode power supplies, dc regulated power supplies and ac power supplies from medical lasers and radio broadcasting to ships anchors and radar systems. Secrets of smps repair and troubleshooting switch mode. Troubleshooting linear power supply was quite easy as compare to switch mode power supplies smps.
Switchmode power supplies are a popular and sometimes necessary choice for dcdc power conversion. Here is what you get from the switch mode power supplies repair guide. An electrical power supply that incorporates a switching regulator to convert electrical power efficiently. Also a brief explanation about the difference between. Switchmode power supply troubleshooting safety the primary danger to you is from the input side of the supply which is directly connected to the ac line and will have large electrolytic capacitors with 320 v or greater dc when powered often, even if the supply does not work correctly and for some time after being unplugged especially if the power. This scoop about how to repair crt tv power supply pdf posted by chloe, one of our free article writer.
Download switched mode power supplies pdf 153p download free online book chm pdf. Switch mode power supply high voltage power supply high current power supply linear power supply dc power supply dc battery chargers if you need your power supply tested or repaired then give us a call at 369690110. Refer to the engineering data section on page 17 for details. Ebook smps design pdf pdf troubleshooting and repairing switch mode power supplies can be extremely confusing thing unless you have some one that will help you through the whole process.
Nov 20, 2017 discover how to repair smps power supply using a super crazy detailed tutorial manual for troubleshooting all sorts of smps problems. The buck switching regulator is a type of switch mode power supply circuit that is designed to efficiently reduce dc voltage from a higher voltage to a lower one, that is it subtracts or bucks the supply voltage, thereby reducing the voltage available at the output terminals without changing the polarity. A switched mode power supply smps is an electronic circuit that converts power using switching devices that are turned on and off at high frequencies, and storage components such as inductors or capacitors to supply power when the switching device is in its nonconduction state. It is not a switch mode power supply smps which are lightweight 10 lbs, it is a linear supply ei transformer which are heavy 46 lbs, and use the lm723 regulator and. When the power switch is on, the input voltage is connected to the input of the. Whether you are an experienced power supply designer, designing your first switching power supply or responsible for a make or buy decision for power supplies, the variety of information. Yaesu fp29 power supply stopped working qrz forums. This article is written as per the request made by mr. I am jestine yong and i am a specialist electronic repairer. The below photos are just some of the example of small switch mode power supplies that you can modify. Switchmode power supply troubleshooting safety the primary danger to you is from the input side of the supply which is directly connected to. A switchedmode power supply switchingmode power supply, switchmode power supply, switched power supply, smps, or switcher is an electronic power supply that incorporates a. Why can a switched mode power supply be dammaged without load.
Regardless if you are fixing and troubleshooting plasma tv, vcd, lcd tv, monitor, dvd, cctv, printer, satellite receiver, xbox, audio equipment, atx power supplies, power adapter, data. Dynapower acquired rapid power technologies in the early 2000s, and since then has. A switch mode power supply is a power converter that utilises switching devices such as mosfets that continuously turn on and off at high frequency. Forwardmode converter fundamentals the most elementary forwardmode converter is the buck or stepdown converter which can be seen in figure 1. How to repair a switching switch mode power supply. This application note, which is the first of a twopart series, explains the basics of. Voltage regulation is achieved by varying the ratio of on tooff time. How to easily understand the functions of switch mode power supply.
For anybody still working on a desktop, look for the fan output in the central processing units cpu. New design methods required for powering small, highperformance electronic devices are presented. My new smps modification repair ebook jestine yong. Secrets of smps repair and troubleshooting switch mode power.
Nov 01, 2007 very often when i attempt to repair electronic devices, either mine or from friends, i find out the problem is with the power supply which these days is most often a switched mode power supply smps. Understanding the functions of switch mode power supply troubleshooting linear power supply is extremely straightforward as opposed to smps or switch mode power supplies. Covering the latest developments and techniques, switchmode power supply handbook, third edition is a. Fp29 power supply for ft mark v 200w radio this is power supply is a switch mode smps design. Switch mode power supply power supply repair power. Secrets of smps repair and troubleshooting switch mode power supply smps repair sometimes can be easy and sometimes are quite difficult to solve the problem. There are several topologies commonly used to implement smps. Btw, astron does not make or sell smps rated at 50.
Forward mode converter fundamentals the most elementary forward mode converter is the buck or stepdown converter which can be seen in figure 1. Whether your design is 1w or 1200w, fairchilds solutions help achieve increased efficiency, reduce standby power, and support the industrys 1w initiatives. Most of them are flyback, regulated, smps but not all. These devices are incredibly reliable, but being very often left powered all the time even when their load is switched off, they still are the weak link. Recent advances in semiconductor, magnetic and passive technologies make the switching power supply an ever more popular choice in the power conversion arena. It transfers power from a source, to a load, while converting voltage and current characteristics. An introduction to switchmode power supplies application. A switch mode power supply smps switches been fullyon and fullyoff states quickly to maintain voltage regulation. Getting into the power supply repair field is not hard. Switch mode power supplies are a popular and sometimes necessary choice for dcdc power conversion. He gives a broad explanation as to how switched mode power supplies work as well as discusses some of the reasons these devices tend to. An introduction to switchmode power supplies sep 27, 2007 abstract.
Switch mode power supplies repair guide donwnload pdf ebook. Repairing switched mode power supplies smps all about. These circuits offer distinct benefits and tradeoffs when compared to alternative methods of converting dc power. Those experienced electronic repairers know that having the right procedure to troubleshoot and repair power supplies is the key to longterm success look, if you have a wealth of knowledge regarding switch mode power supplies theories, but no practical on repairs, what good is that. See more ideas about switched mode power supply, case histories and this or that questions. Mode power supply reference manual should prove useful. That is why i am aware you are likely to be delighted if you discover this web site, while there is finally a sure and guarantee method to learn the secrets of switch mode power supplies repair. Switchmode power supply reference manual on semiconductor. Its operation can be seen as having two distinct time periods which occur when the series power switch is on and off. A switchedmode power supply smps is an electronic circuit that converts power using switching devices that are turned on and off at high frequencies, and storage components such. Switch mode power supply power supply repair power supply. Switchmode power supplies for all your power supply repair. The various types of voltage regulators, used in linear power supplies.
Also a brief explanation about the difference between linear and switch mode power supplies. By jestine yong on july 12, 2014 after many hours of hardwork, finally my latest ebook on small switched mode power supplies. Topologies of switch mode dcdc converters, dc transfer functions, efficiency, devices, chokes and transformers for switched converters, dynamic response in open and closed loop, resonant converters, design of feedback networks. Switch mode power supply here is a small list of the types of power supples we repair. How to test and use in applications june 2, 2017 by david herres leave a comment the two major types of power supplies, linear and switch mode. Switch mode power supplies switching vs linear power supplies. Regardless if you are fixing and troubleshooting plasma tv, vcd, lcd tv, monitor, dvd, cctv, printer, satellite receiver, xbox, audio equipment, atx power supplies, power adapter, data projector, you absolutely must have this unique effective book to demonstrate you the way to be an expert on switch mode power supplies repair and smps troubleshooting in just 7 days guaranteed.
Pc power supplies, switching power supply circuits. The big high power components and small heat sinks are typical of smps. Aug 07, 2011 this scoop about how to repair crt tv power supply pdf posted by chloe, one of our free article writer. Switch mode power supplies repair guide donwnload pdf. This book covers switchedmode power supplies that you may. Feb 06, 2011 switched mode power supply repair guide. When switch 1 mosfet 1 is on and switch 2 is off, the energy is transferred to the load rl through transformer, c2, and d1. Most of these tips can apply to any switch mode power supply smps. Most likely a misprint in that catalog 22 years ago or a misunderstanding on your part. Jan 17, 2012 it is not a switch mode power supply smps which are lightweight 10 lbs, it is a linear supply ei transformer which are heavy 46 lbs, and use the lm723 regulator and 2n3711 npn pass transistors. Samsung power supply repair fix hpt5034 hpt5054 hpt5064 bn4400160a 162a 189a 190a bn44 dyp50w2 duration. Advantages of small switch mode power supplies modification.
Power supply repair switch mode power supplies repair. About repairing switchmode power supplies the resource is currently listed in in a single category. He gives a broad explanation as to how switched mode power supplies work as well as discusses some of the. Apr, 2016 how to repair a switching switch mode power supply. Unlike a linear regulator, however, an smps can also provide a stepup function and an inverted output function. I have just finished assembling a house study course about. In this video i show how to repair an atx computer power supply and what are the most common failures. The term switch mode was widely used until motorola claimed ownership of the trademark switchmode for products aimed at the switching mode power supply market and started to enforce their trademark. Easy to follow step by step instructions 271 pages. Ac voltage gets into the primary part in linear transformer after which modified the ac in a decreased or increased ac voltage with regards to the second transformer winding.
An introduction to switch mode power supplies sep 27, 2007 abstract. They offer lower power dissipation and run cooler than linear. You will understand how a switch mode power supplies works the power mosfet technology and atx power supplies you will know how to read the schematic diagram and the functions of each section in smps. The main category is power supply projects that is about power supply. Mar 12, 20 uncover battletested switch mode power supply repair strategies by downloading this allinclusive smps troubleshooting manual thats stuffed with color photos. Converters belong to the category of switched mode power supplies smps.
Those experienced electronic repairers know that having the right procedure to. Covering the latest developments and techniques, switchmode power supply handbook, third edition is a thorough revision of the industryleading resource for power supply designers. Fp29 power supply for ft mark v 200w radio this is power supply is a switchmode smps design. Applications of different topologies and their pros and cons are also discussed in detail. How to repair a switchmodepowersupply smps in this post we try to diagnose a burnt smps circuit and try to troubleshoot and repair the circuit.
1010 1210 1061 1088 815 576 1502 1294 325 793 745 1472 1311 700 713 271 1542 1032 627 781 1186 958 670 416 812 877 869 705 1000 501 433 1200 985 679