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I’ll try to show in a very datasheef way how a switch mode power supply works and how to change the feedback circuit so the power supply outputs the voltage you want. No blue magic smoke. Wait at least one minute after disconnecting it from mains before handling it again while open.

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When nothing connected it is 28V what is modified to be. When you turn on the power supply, the switch is open and the capacitor is discharged, at 0V. In this pagewe can see how to use a datassheet output power supply to identify the voltage divider. Testing pin 3 I’ve read 2. Using a voltage divider. Well, it’s actually pretty easy to identify each part.

You want a 5V output voltage and have a 2. Also, when I changed the voltage on the variable power supply, I could see the voltage on pin 2 changing according to it. I’ve then put two 10kOhms resistors and one 1.

The comparator gets the value and compares it to the voltage reference. You would be comparing the half of 4. If R2 is 1kOhm, you have:. As you want a specific voltage on the output low voltage sidethe feedback circuit tells the control circuit that the output voltage is below the desired voltage.


The only problem I could think was the current flowing to the comparator through the optocoupler, so I changed the old Ohms resistor to a 1kOhms resistor and tested the the circuit again.

Almost every SMPS feedback circuit works by dividing the output voltage using a voltage dividerthen comparing the divided voltage with a reference voltage. This is the feedback circuit telling the control circuit to stop charging the output capacitor.

Description This project was part of my Soldering Station project, but I’ve decided to make it a standalone project, as it’s a little more detailed than I intend to detail the rest of the Soldering Station project.

Let’s first understand how a switching power supply works. Suppose your output voltage was at 4.

The idea behind it is modifying a 19V 65W notebook power supply to output 24V. But when Datashfet connect even very small load, it shuts off. Become a member to follow this project and never miss any updates Become a member. Test the power supply with a variable voltage power supply.

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I connect the variable power supply to the power supply I want to modify and measure the voltage at the optocoupler. View all 3 project logs. What we want to do is to change the voltage divider, changing the voltage at which the comparator tells the control circuit to charge datasyeet capacitor.

The control circuit then closes the switch, allowing current to flow from the high voltage side to the low voltage side. The part closest to the AC power cord is the input high voltagethe middle part is the sy circuit high voltage and the part closest to the DC output is the feedback datasyeet low voltage.


SMPS are much more complex, but this is enough to give a good understanding on the theory of operation. The images below are purely educational.

Did’nt bother much more due to the Et being covered in thermal glue hiding the circuit. I’ve replaced the 22k with 27k since I did not have 28k available and the output voltage is a bit above 23V which is enough for me. Has anyone solved this problem? It’s now time to actually modify the notebook PSU. Does this project spark your interest? I reconnected the variable power supply and changed the voltage while measuring the output at the optocoupler.

You’ll need to make 5V looks like 2. That’s pretty close to the 2. It’s done, now your power supply outputs the desired voltage. If the value is higher than the voltage reference, the comparator tells the control circuit to open the switch, as your output voltage is over the 130aiw value.

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There’s an easy way to identify them. Let’s take a closer look: I datqsheet the same problem like David with modifying 20V Fujitsu Siemens laptop power brick.

These steps keep repeating, maintaining the output voltage at the desired value. A better view of the optocoupler: Feedback circuit working like a charm.