Troubleshooting And mend Power supply The Easy Way

Troubleshooting - Troubleshooting And mend Power supply The Easy Way

Hi friends. Yesterday, I found out about Troubleshooting - Troubleshooting And mend Power supply The Easy Way. Which is very helpful for me and you. Troubleshooting And mend Power supply The Easy Way

Troubleshooting linear power provide was quite easy as compare to switch mode power supplies (Smps). Ac voltage enters to the traditional side of linear transformer and then converted the Ac into a lower or higher Ac voltage depending on the secondary winding. The output Ac voltage is then rectified and filtered by a diode and capacitors to produce a clean Dc voltage. If there is a question in the linear transformer circuit, I can say that it is very easy to locate the fault. This is somehow different in the case of a switch mode power supply. The designs were involved and some technicians found it quite hard to fully understand how the switch mode power supplies work.

What I said. It just isn't in conclusion that the real about Troubleshooting. You see this article for facts about anyone need to know is Troubleshooting.

Troubleshooting

The working principle of switch mode power provide is different from the linear type. First the Ac voltage will flow to a full wave rectifier (bridge rectifier) which produces an uneven Dc output and then filtered by a large capacitor (usually 220 micro farad and up to 450 volts). The clean Dc voltage will then flows to start up resistors and to the input of switch mode power transformer. Once the voltage passed straight through the high ohms resistor (start up resistors) the voltage would drop to a value where it then flows to the Vcc provide pin of Pulse width modulation Ic.

Once the Pwm Ic received the voltage it will output a signal to drive the transistor (or Fet) and produces a changing in magnetic field in the transformer traditional winding. The changing magnetic field induces voltage in the secondary windings. Each of these Ac voltage produced by the secondary windings is then rectified, filtered, and regulated to produce a clean Dc voltage. One of the main Dc output voltage is the B+ that provide to flyback transformer (for Tv and Monitor Circuit)

The output from the B+ voltage provide is then connected, straight through a “feedback” loop (which consist of optoisolator ic and an error amplifier Tl431 Ic), back to the Pwm Ic. When the voltage from the B+ provide rises or drop a bit, the Pwm Ic will act to strict the output.

If you still do not understand the above explanation, please do not be discourage because you can all the time buy technical books and schematic diagrams and read it till you get the whole idea of how a Smps work. You can ask a repair friend or even surf the internet for a best and easy explanation.

Here I would like you to download a free Smps narrative by Sencore and I found it to be a great help for you who are still struggle on how Smps work and how to troubleshoot when it fails. You must ask your self what is the purpose and its function of the components in the Smps circuit and how to check them if they fail. Find out on your own the function of these components in Smps circuit:

Bridge rectifier,

Filter capacitor,

Start up resistors

Chopper/Power Fet

Pulse Width Modulation (Pwm Ic)

Current sense resistor

Switch mode power transformer

Optoisolator/optocoupler

Error Amplifier Ic (Tl431)

Secondary diodes

Secondary filter capacitors

Push yourself further by searching the internet for the datasheet of a Pwm Ic part number. For example, Uc3842 Pwm Ic is mostly used in Smps. Do you know what the function of pin 5 of this Ic is? Do you know which pin the Vcc provide enters? Do you know what the actual voltage that flow to the Ic is? Do you know which pin that drives the power Fet? Can I get a exchange for this Ic? And so on………

Let’s take a soldier as an example. Soldiers not only good in handling rifle but also knows all the details about it. They know how to dismantle and assemble back their rifle fast (imagine in the middle of war the rifle jammed-they can repair it fast). They know how much each bullet cost, how far the shooting distance, how big is the diameter of the bullet, how many cm the length of the bullet and so on. Hope you don’t get bored with the soldier’s story, did you get the ideas?

Any Smps that comes across my repair bench, I would not immediately repair it, in fact I will take couples of minutes to analyze the circuit institute and see it from all angles before I begin to repair. Troubleshooting Smps is not petite to only one procedure in fact many electronic repairers have their own unique ways and methods to solve Smps problems. Some prefer to use light bulb to separate Smps faults while others like to use resistors. Troubleshooting Smps is fun and flexible but in some cases could make you get very frustrated too.

Remember, don’t limit yourself to only one or two sources to get you understand and be able to repair Smps. If you have the budget, get the books that have linked to Smps repair-study and start doing practical about it. Share your problems with other fellow electronic repairers and the most important thing is don’t give up. There’s lot of mountain in the journey of our live and you yourself have to climb and conquer it. All the best!

I hope you receive new knowledge about Troubleshooting. Where you possibly can offer easy use in your day-to-day life. And above all, your reaction is passed about Troubleshooting.