Switching Power Supply

Switching Power Supply Repair – Discover 3 Must Avoid Mistakes When Repairing SMPS

Before conducting a switching power supply repair work, there are a few mistakes that you MUST avoid!

Right now, we're going to take a look at 3 of the most common mistakes that newbie technicians make when repairing switch mode power supplies or SMPS.

Heck, even seasoned technicians commit these mistakes as well…

How about you? Do you make these mistakes when conducting switching power supply repair?

Mistake #1

You lack experience but refuse to follow repair manuals that are presented in a step-by-step manner accompanied with lots of photos and examples.

You see, I know a few technicians who prefer to follow text-intensive SMPS repair manuals as their only reference guide. They say that manual with complete step-by-step photos are meant only for "beginners".

I totally disagree! If you want to solve your SMPS problems as quickly as possible, then I suggest you refer repair manuals that are photo intensive. You'll learn to fix SMPS a lot faster with that sort of manual.

Believe me, most text intensive repair manuals are very hard to follow!

Speaking of photo intensive repair manual, here's one that's pretty decent (271 pages)... Manual for repairing SMPS (please note that a new window will open)

Mistake #2

Shot circuit problem in the output line and you refuse to remove the components in that section one at a time. Don't be lazy! I used to take ages to isolate problems in the output line because I was too lazy to troubleshoot one component at a time.

Trust me, with enough practice you'll be able to remove the components and isolate the problem at lightning speed.

Taking shortcuts is not recommended when it comes to switching power supply repair…

Mistake #3

You replaced the power IC without checking it thoroughly. This is a pretty common problem and I did it a few times when I first began repairing SMPS units.

If you think the issue lies with the power FET for instance, I recommend you inspect the power IC properly before replacing it.

You can actually make your own IC testing tool. And then use this tester on the power IC to assess its condition.

Don't simply replace because you'll be wasting money if the power IC turns out to be in good condition.

Yes, you can learn how to build your own power IC AND also zener diode tester by following step-by-step guides that are packed together with the 271+ pages switching power supply repair manual.

Follow this link for download information: http://www.smpsrepair.info/

About the Author

Jerry Gazila

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Switching Power Supply Design $99.95 The World's #1 Guide to Power Supply Design Now Updated!. Recognized worldwide as the definitive guide to power supply design for over 25 years, Switching Power Supply Design has been updated to cover the latest innovations in technology, materials, and components. This Third Edition presents the basic principles of the most commonly used topologies, providing you with the essential information required to design cutting-edge power supplies. Using a tutorial, how-and-why approach, this expert resource is filled with design examples, equations, and charts. The Third Edition of Switching Power Supply Design features: Designs for many of the most useful switching power supply topologies; The core principles required to solve day-to-day design problems; A strong focus on the essential basics of transformer and magnetics design; New to this edition: a full chapter on choke design and optimum drive conditions for modern fast IGBTs. Get Everything You Need to Design a Complete Switching Power Supply:. Fundamental Switching Regulators * Push-Pull and Forward Converter Topologies * Half- and Full-Bridge Converter Topologies * Flyback Converter Topologies * Current-Mode and Current-Fed Topologies * Miscellaneous Topologies * Transformer and Magnetics Design * High-Frequency Choke Design * Optimum Drive Conditions for Bipolar Power Transistors, MOSFETs, Power Transistors, and IGBTs * Drive Circuits for Magnetic Amplifiers * Postregulators * Turn-on, Turn-off Switching Losses and Low Loss Snubbers * Feedback-Loop Stabilization * Resonant Converter Waveforms * Power Factor and Power Factor Correction * High-Frequency Power Sources for Fluorescent Lamps, and Low-Input-Voltage Regulators for Laptop Computers and Portable Equipment

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Switching Power Supply Design & Optimization $103.98 This is a rigorous, carefully explained and motivated "beginner's bible" to power supply design. Between dense, mathematical textbooks on power electronics and tiny power supply "cookbooks" there exists no practical tutorial on the hazards of contemporary power supply design. Our Pressman book, the 800 lb gorilla in the field, is both mathematically dense and 7 years old. This new book, detailing cutting edge thermal management techniques, grouping key design equations in a special reference section, and containing a concise Design FAQ, will serve both as an invaluable tutorial and quick reference.

Power Supply 24v 24w Switching $67.89 - Valcom 1 amp/24V power supply- Smaller footprint- Wall, rack/rail mountable- Mounting bracket included- 100 - 240V- Less energy/ less heat- Barrel or wire connection- UL/C and CEVCVP1124D

Demystifying Switching Power Supplies $63.95 This book is a crash course in the fundamental theory, concepts, and terminology of switching power supplies. It is designed to quickly prepare engineers to make key decisions about power supplies for their projects. Intended for readers who need to quickly understand the key points of switching power supplies, this book covers the 20% of the topic that engineers use, 80% of the time. Unlike existing switching power supply books that deal strictly with design issues, this book also recognizes the growing importance of "off-the-shelf" commercial switching power supplies, giving readers the background necessary to select the right commercial supply. This book covers the core essentials of power supply theory and design while keeping mathematics to the absolute minimum necessary. Special attention is given to the selection of appropriate components, such as inductors and transformers, to ensure safe and reliable operation. Engineers, whose main design responsibilities are in other areas, will better understand the strengths and weaknesses of switching power supplies and whether such supplies are appropriate for their projects. They will be able to give more meaningful design requirements and specifications to those who design switching power supplies. * Discusses both AC line supplies and DC-DC inverters. * Covers the main switching power supply designs, including flyback, forward conversion, bridge, buch, boost, and boost/buck topologies. * Design examples include a 220 volt offline switching power supply and a 110 volt uninterruptible supply.

Is-780Pd8 - 780W Ps2 Atx 80 Plus Switching Power Supply $219.94 the Istarusa 80 Plus Series Switching Power Supply Supports Latest Motherboard Connectors Of 20, 24, 8, And 4 Pins. Standard Ps2 Form Factor Fits Most Atx Or 4u Chassis. The 80 Plus Means That At Least 80 Percent Efficiency At 20, 50, And 100 Percent Loads, Which Saves Users On Electric Bills And Less Cooling Requirement. Istarusa 80 Plus Series Is The Ideal Power Supply For High-end Workstation. [2387109] UPC: 689076126489 UNSPC: 39121000 12.6L x 10.2W x 8.6H 7.55 LB

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120mm Silent Cooling Fan Switching Power Supply CX-400B - power supply - 400 Watt $34.99 Coolmax 120mm Silent Cooling Fan Switching Power Supply CX-400B - Power supply ( internal ) - ATX12V - 400 Watt

Clover Electronics ADT123004 Switching Mode Power Supply $40.3 This Switching Mode Power Supply from Clover is a regulated 12VAC adapter. Designed with four connectors this unit powers four Clover RD3354 CCTV cameras simultaneously. Regulated 12VAC adapter. Power up to four Clover Electronics CCTV cameras. Designed with four connectors.

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Va-100P-5 - 10-Outlet Power Supply $396 This AC Power Supply is an Efficient Ten-outlet Universal Switching Power Supply That Can Supply 5V DC at up to 8a. It is Designed to Operate Kramer Products That Use an External 5V DC Power Transformer. [2965576] Truck Delivery UNSPC: 39121004 13.78L x 8.86W x 3.15H 5 LB 1 Cubes

Troubleshooting Switching Power Converters $76.95 Power Supply design is all about detail. And a large part of that detail lies in the practical domain, largely because of the typically small number of microseconds of switching periods involved, and the even smaller tens of nanoseconds of switch transition times --- all these, in effect accentuating various "second-order" effects, that eventually end up playing prime havoc with "normal" expectations of how the circuit should behave. So not unsurprisingly, even after reading several books, most readers still find themselves no closer to the ultimate goal of designing an actual power supply. Sooner or later, all engineers start realizing the hard fact that designing a switching power supply isn't the trivial task it once seemed to be. But even after years of successfully mastering the underlying theory, the ultimate goal of creating a cost-effective, reliable and commercially viable power supply may still remain a distant dream, since success ultimately hinges on experience. That is, in fact, what clearly differentiates a senior and seasoned power supply engineer from the others --- the ability to navigate and surmount a veritable minefield of tricky issues that can only be learned the hard way, by actual hands-on experience on the job. This book presents practical knowledge the author acquired rather painfully, while working "in the trenches" for several years in major engineering companies scattered across several continents. This is intended to be the mythical senior engineer's "bag of tricks," finally made available in the form of an easy-to-read book on your shelf. This book will make life for the ambitious power supply engineer much simpler --- besides reducing significantly, the rigorous requirement of having to be a senior engineer's protg for years on end, just to gain a small measure of real success in this field. * A practical presentation that answers the important question: why is my switching converter behaving so differently than what I was expecting on the basis of my paper design? And how do I bridge that huge gap? * For the first time, a systematic and thorough discussion of troubleshooting switching power supplies. * Coverage of AC/DC and DC/DC power supplies. * Bench Evaluation of semiconductor ICs used in power conversion --- describing standard and unusual techniques mastered by the author, while testing similar chips at National Semiconductor. * Detailed coverage of vital topics that haven't been covered by available sources --- grounding systems, the subtleties of component datasheets, and using instruments and probes effectively. * Systematic investigation (type of failure mechanism, topology, etc.) and solutions for 5 years of reported power supply issues on a prominent, public web forum. This approach will ensure that engineers will not repeat the same mistakes. * A unique, readable style: personal and direct; no mystification--- just the plain truth, easily and logically explained, with plen

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Apex 300W ATX 12V Switching Power Supply $31.99 -12 V DC -5 V DC 1 Year 1 x 20-pin ATX Motherboard 1 x 4-pin ATX Motherboard 1 x 4-pin LP4 Peripheral Device 1 x 4-pin SP4 Floppy Drive 1 x 6-pin AUX 12 V DC 132 V AC 180 V AC to 264 V AC 264 V AC 3.3 V DC 3.30" Height x 6" Width x 5.50" Depth 300 W 300W ATX 12V Switching Power Supply 32°F (0°C) to 122°F (50°C) Operating 47 Hz to 63 Hz 5 V DC 50000 Hour 90 V AC to 132 V AC AMD Systems Intel Systems: Pentium 3 Pentium 4 UL CSA FCC TUV NEMKO DEMKO SEMKO FI CE AL-A300ATX ATX12V Power Supply Apex Apex Computer Technology, Inc www.apextechusa.com

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Samlex SEC1235 SEC1235 Desktop Switching Power Supply $203.76 This high efficiency UL609501 approved ACDC power converter provides a highly regulated output DC voltage of 13.8 Volts at 30 Amps with an AC input of 120 Volts 60 Hz (230 Volts 50 Hz possible models also available). These advanced switchmode DC power supplies were designed specifically for land mobile radio applications. The power supplies produce clean reliable power and are highly filtered to suppress RFI. The unit comes with a detachable power supply cord with NEMA 515P plug. Features include overcurrent shortcircuit and overtemperature protection. The ACDC power supply conforms to FCC Part 15(B) class B digital device.

Samlex SEC1212 SEC1212 Desktop Switching Power Supply $133.2 This high efficiency UL609501 approved ACDC power converter provides a highly regulated output DC voltage of 13.8 Volts at 10 Amps with an AC input of 120 Volts 60 Hz (230 Volts 50 Hz model also available). These advanced switchmode DC power supplies were designed specifically for use with land mobile radio. The power supplies produce clean reliable power and are highly filtered to suppress RFI. The unit comes with a detachable power supply cord with NEMA 515P plug. Features include overcurrent shortcircuit and overvoltage protection. The ACDC power supply conforms to FCC Part 15(B) class B digital device.

Switching Power Supplies A to Z $72.95 The design of Switching Power Supplies has become one of the most crucial aspects of power electronics, particularly in the explosive market for portable devices. Unfortunately, this seemingly simple mechanism is actually one of the most complex and under-estimated processes in Power Electronics. Switching power conversion involves several engineering disciplines: Semiconductor Physics, Thermal Management, Control Loop theory, Magnetics etc, and all these come into play eventually, in ways hard for non-experts to grasp. This book grows out of decades of the author's experience designing commercial power supplies. Although his formal education was in physics, he learned the hard way what it took to succeed in designing power supplies for companies like Siemens and National Semiconductor. His passion for power supplies and his empathy for the practicing or aspiring power conversion engineer is evident on every page. * The most comprehensive study available of the theoretical and practical aspects of controlling and measuring Electromagnetic Interference in switching power supplies, including input filter instability considerations. * Step-by-step and iterative approach for calculating high-frequency losses in forward converter transformers, including Proximity losses based on Dowell's equations. * Thorough, yet uniquely simple design flow-chart for building DC-DC converters and their magnetic components under typical wide-input supply conditions * Step-by-step, solved examples for stabilizing control loops of all three major topologies, using either transconductance or conventional operational amplifiers, and either current-mode or voltage-mode control.

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Switching Power Supplies A-Z $69.95 This book is the most comprehensive study available of the theoretical and practical aspects of controlling and measuring Electromagnetic Interference in switching power supplies, including input filter instability considerations. The new edition is thoroughly revised with six completely new chapters, while the existing EMI chapters are expanded to include many more step-by-step numerical examples and key derivations and EMI mitigation techniques. New topics cover the length and breadth of modern switching power conversion techniques, lucidly explained in simple but thorough terms, now with uniquely detailed "wall-reference charts" providing easy access to even complex topics. Step-by-step and iterative approach for calculating high-frequency losses in forward converter transformers, including Proximity losses based on Dowell's equations Thorough, yet uniquely simple design flow-chart for building DC-DC converters and their magnetic components under typical wide-input supply conditions Step-by-step, solved examples for stabilizing control loops of all three major topologies, using either transconductance or conventional operational amplifiers, and either current-mode or voltage-mode control

iStarUSA 230-watt 1U DC Switching Power Supply $447.98 A forced-air fan cooling system, triple circuit protections and -38/-72-volt DC input options are featured in this power supply from iStarUSA. This power supply is designed for telecommunication, automation and IPC systems.Industrial-graded CP-40023 1U series DC power supplyDesigned for telecommunication, automation and IPC systemsForced-air fan cooling systemTriple circuit protections-38/-72-volt DC input optionsProduct type: Computer hardwareModel number: CP-40023Dimensions: 9.5 inches wide x 7 inches deep x 4 inches high

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