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You should Sign Up. Already have an account? I wiped my webserver and the images datqsheet broken. Uploaded everything to hackaday. It’s now time to actually modify the notebook PSU. We’ll need to open it, identify the feedback circuit and change the reference voltage divider. There are two clear divisions on this circuit board, the rubber pads are even marking it, along with silkscreen and areas without components.
The part closest to the AC power cord is the input high voltagethe middle part is the control circuit high voltage and the part closest to the DC output is the feedback circuit low voltage.
Now that we’ve found our feedback circuit, it’s time to search for the voltage divider we want to modify. I’ve already identified the main parts on the feedback circuit. You can see the positive and negative outputs, the main controller comparator and reference voltage and the connection to the control circuit, through the optocoupler.
Nice, but how do we identify the voltage divider? There are lots of resistors, how would we know which are the ones we are looking for? There’s an easy way to identify them. In this pagewe can see how to use a variable output power supply to identify the voltage divider.
That helps a lot. I connect the variable power supply to the power supply I want to modify and measure the voltage at the optocoupler.
Just when it’s about to reach 18V 19V – 1Vthe voltage suddenly drops to 3V. Having the datasheet of the comparator in hands always helps. It’s easy to see where the inputs are.
Testing pin 3 I’ve read 2. It was not that precise, but well, there it was. Also, when I changed the voltage on the variable power supply, I could see the voltage on pin 2 changing according to it. The original values were 15kOhms for R40 and 2. Consider the output voltage at 19V and calculate the divider, you get around 2. That’s pretty close to the 2. I didn’t have any good values to change only one resistor of the divider, but I’ve found that R42 and R43 unpopulated at the time were in parallel to R I’ve then put two 10kOhms resistors and one 1.
I reconnected the variable power supply and changed the voltage while measuring the output at the optocoupler. When it reached around 23V, the output changed.
Feedback circuit working like a charm. The problem was somewhere else. 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.
No blue magic smoke. This project was part of my Soldering Station datasjeet. The idea behind it is modifying a 19V 65W notebook power supply to output 24V. I’ll try to show in a very simplified way how a switch mode power supply works and how to change the feedback circuit so the power supply outputs the voltage you want. Let’s first understand how a switching power supply works. The images below are purely educational.
Datashet are much more complex, but this is enough to give a good understanding on the theory of operation. For a step down power supply, that is, a power supply which outputs datashfet lower voltage than you have on the input, you have a switch and a capacitor. The name “switching” comes from this switch. As you want a specific voltage on the output low stt sidethe feedback circuit tells the control circuit that the output voltage is below the desired voltage.
The control circuit then closes the switch, allowing current to flow from the high voltage side to the low voltage side. As the current flows into the capacitor, the output voltage starts to rise.
When the feedback circuit senses the output voltage is at the desired value, it tells the control circuit to stop charging the capacitor. All good, but the capacitor starts discharging over time, and so 1033aiw output voltage starts to drop. The feedback circuit notices this and, when the voltage is below the threshold, it tells the control circuit so, which closes the switch again.
These steps keep repeating, maintaining the output voltage at the desired value. The image below is a real SMPS maintaining it’s output voltage. Notice how it datashheet then discharges the capacitor. There’s no real secret to that. Almost every SMPS feedback circuit works by dividing the output voltage using a voltage dividerthen comparing the divided voltage with a reference voltage.
The voltage divider divides the output voltage by a known constant and feed it to a comparator. The comparator gets the value and compares it to the voltage reference. 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 desired value. Else, if the value is lower than the voltage reference, 103aie comparator tells the control circuit to keep charging the capacitor, because your output value is lower than the desired value.
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You want a 5V output voltage and have a 2. Your comparator will tell you if a value is higher or lower than 2. Datasbeet need to make 5V looks like 2. How would you do this? Using a voltage divider. Let’s use a R2 as 1kOhm and calculate R1 to make our voltage divider. If R2 is 1kOhm, you have:. Suppose your output voltage was at 4.
You would be comparing the half of 4. The comparator will notice that 2. Now, suppose your output voltage keeps raising and reach 5. The half of it is 2. The comparator will now 103aiww the control circuit to stop charging the capacitor. Now, with a basic understanding of how a SMPS works, there should be no problem modifying one to output our desired voltage.
What we want to do is to change the voltage divider, changing the voltage at which the comparator tells the control circuit to charge the capacitor. View all 3 project logs.
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Some undervoltage protection, or??? Hello, i have the same problem as users above: I think is DAP8A some protection.
Has anyone solved this problem? I have the same problem like David with modifying 20V Fujitsu Siemens laptop power brick. When nothing connected it is 28V what is modified to be.
But when I connect even very small load, it shuts off.
AIW – ST – IC Chips – Kynix Semiconductor
Over voltage protection could be a problem with this, but I have not figured out how to bypass it yet. 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. Any clue what could be the cause? Do you have any ideia what’s that iron core transformer doing on the top side of the board? I managed to get up to Did’nt bother much more due to the PCB being covered in thermal glue hiding the circuit.
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Description This project was part of my Soldering Station project, but I’ve decided to make it a datasheey project, as it’s a little more detailed than I intend to detail the rest of the Soldering Station project. Wait at least one minute after disconnecting it from mains before handling it again while open. 130aiw the power supply with a variable voltage power supply.
Let’s have a look at the open PSU: Nice, but what is what on this power supply?