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    If you find that you can troubleshoot switching power supplies, the following user guide will help you. If we only see a certain line, that’s it. And this amazing line will protect you from the vestar and the other position goes through this inductor.


    troubleshoot switch mode power supply

    Switching-mode power supplies (SMPS) are common among most people today.Technics.Old-fashioned linear power fabrics based on mains frequency transformers are beyond doubt.disappear mainly due to their individual cost, size and weight.We produce mains power here (eg 120V or 230V AC)Power supplies ranging from a few watts to several hundred watts.

    Switch-mode power supplies everywhere; Here are some pictures attachedhis intestines. BigHigh performance gears and small heatsinks are SMPS favorites.

    These devices are incredibly good, but very often they are all left on.Time (even if the presence of the load is stopped) these companies are always the weakestLabel.The components can be apply high voltage, they heat up, age quicklypermanent work and whenever there is an increase, SMPS is the firstaffected level.Many situations with our home appliances are due to smps errors.

    Unfortunately, SMPS is still a little hard to fix, in addition to what I get asked a lot.Advice.So, in this world wide web, I have summarized the main ideas and techniques that I usemore.

    Why do switch mode PSU fail?

    SMPS failure in most cases is due to the fact that capacitors lose their properties over time. High (local) temperatures and high output current capabilities cause degradation somewhat earlier. The ESR of its capacitor increases with time as the circuit is active.

    I’m assuming you have a circuit designed here that has made a career ofperfect and suddenly it didn’t work.If you try to debug your own trend it will still record some of these tips,but you probably need a lot more than this article.

    SMPS Structure

    First, there are several ways to look at another manufacturer’s switching power supply block diagram.The mains current enters the circuits, is rectified through the mains filter and furthersmoothed to obtain a higher DC voltage (about 100 volts).Some rectifiers have a switch that makes them voltage doublers .with 120V AC, or maybe just a rectifier if you’re working with 230V.Some others are designed to operate on, say, 100 VAC, which can operate on 240 VAC withoutswitch and the actual controller will do the rest.This higher DC voltage is switched by one or more transistors (or MOSFETs) that can do this.control the primary winding of a large ferrite transformer.On the secondary side, our voltage is rectified and filtered.The switching transistors are controlled by a master circuit that determines the output of each of us.Voltage (and input current) are regulated and regulated in the right direction.This control circuit is always on the primary side and is powered most of the time.additional winding on the transformer.A sample of the full output voltage is returned through the optocoupler.In some cases, each of our control circuits is on its own secondary winding and drivestransistor(s) through a small additionSolid transformer.All configurations acquire additional circuits if you wish to allow the controller to do so.Start here at power on.

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  • There is always a fairly clear distinction between high voltage and low voltage.Pages A (mostly the second group of pages).You can see this at the top on the bottom (copper) side of the card type as a larger the tracks.Sometimes our remote soldermask is in an area of ​​the ground where there are holesand slots for increased insulation.In your current images on this page, separation is often marked with the very last line.Red line.

    How does a switch mode power supply work?

    The switching power supply works by turning the mains current on and off very quickly to reduce the existing one. In this case, the voltage drop here depends on the relationship between switching time and breaking force. Switching is very fast, here 10,000 times per second or less.

    Includes classic (cut-through) style components.
    This SMPS uses parts (classic style through holes).The voltage on the high voltage side is to the left of the dotted purple line.

    troubleshoot switch mode power supply

    This SMPS uses modern SMD (Locate Surface) components. alt=”Here all the controllers are made using SMD technology, and additionalAdditional faceted effects. The large SMD is the diode of this low voltage rectifier.” src=”smps-2-bottom-small.jpg”>SMPS
    This uses modern SMD (surface mount) issues.Here, the SMD controller uses scientific research and is installed from the bottom.The large SMD diode has always been a low voltage rectifier.The strong current side is above the dotted Garlito line.

    The primary and lateral secondary windings can usually be completely isolated by a transformer.Very often, when the output ground is not connected to the mains ground,A small high voltage capacitor connects this ground to the high frequency pair.

    How do you troubleshoot a power supply in a circuit?

    Check AC input. Make sure the cable is fully inserted into the surface mount jack and into the power outlet.Check DC connections.Check DC output power.Check installed devices.

    The blue capacitor in this image is all high voltage capacitor.Connect the undervoltage ground to the mains ground.Of course there is DC isolation.

    Safety First

    Before I begin, I just want to remind you that SMPS is a dangerous development: halfcomponents are correctly connected to mains voltage.The large storage capacitor will be charged byand high voltage and can be dangerous.even if the AC power is also turned off.Not all SMPSs contain source resistors (or they may be more broken), so theseCapacitors can remain charged for a long time.Always make sure all capacitors are completely removed before touching them.scheme.Do not use a screwdriver to short the capacitors to loosen theminstead the desired resistance (few pounds and actual torque in watts) to the connected pairisolated probes, like a real multimeter.Then measure the voltage and therefore make sure it is before the start of zero.Also keep in mind that very often such sinks do not sit down and can beworks very well with mains voltage.Be careful with final oscilloscope measurements: oscilloscopes are grounded.the power supply is good (and bad to drive it) and we could make anyruns headfirst into the ground (this would also be dangerous foroscilloscope).In conclusion, SMPS repair is actually something for the experienced andexperienced professionals. just like youif you don’t know exactly what you’re going to do, stay away from SMPS.

    How do you test a switch mode power supply?

    Remove any existing projects from previous tests by selecting Configuration byby default.Click analyze and choose a powerful application. Select the output waveform.Connect human sensors. Connect the voltage probe to the specific output of your power supply. See fig. 3.Click Autotune and Apply.

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