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Modifying a notebook power supply
Now, with a basic understanding of how a SMPS works, there should be no problem modifying one to output our desired voltage. A simple variable power supply based on the LM You should Sign Up.
That’s pretty close datashret the 2. I connect the variable power supply to the power supply I want to modify and measure the voltage at the optocoupler. That helps a lot. Dataasheet use a R2 as 1kOhm and calculate R1 to make our voltage divider.
We’ll need to open it, identify the feedback circuit and change the reference voltage divider. You’ll need to make 5V looks like 2. Become a member to follow this project and never miss any updates Become a member.
The comparator will notice that 2. No blue magic smoke. It’s now time to actually modify the notebook PSU.
AIW(ST,SOP8), DataSheet|Picture – Electronic Parts – Censtry Electronics Co.,Ltd.
Datashset Password Forgot your password? When you turn on the power supply, the switch is open and the capacitor is discharged, at 0V. Your comparator will tell you if a value is higher or lower than 2.
Also, when I changed the voltage on the variable power supply, I could see the voltage on pin 2 changing according to it. It’s easy to see where the inputs are. I reconnected the variable power supply and changed the voltage while measuring the output at the optocoupler.
A better view of the optocoupler: It’s a great datashet. There are two clear divisions on this circuit board, the rubber pads are even marking it, along with silkscreen and areas without components.
It’s done, now your power supply outputs the desired voltage. It will deliver up to ma of current with current limiting. Yes, delete it Cancel.
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Having the datasheet of the comparator in hands always helps. Over voltage protection could be a problem with this, but I have not figured out how to bypass it yet. In this pagewe can see how to use a variable output power supply to identify the voltage divider.
Using the continuity test, I found the resistors to be R40 and R Now that we’ve found our feedback circuit, it’s time to search for the voltage divider we want to modify.
Some undervoltage protection, or??? Your Email Remember me. The image below is a real SMPS maintaining it’s 103alw voltage. The part closest to the AC dt 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.
You are about to report the project ” Modifying a notebook power supply “, please tell us the reason. The name “switching” comes from this switch. 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. About Us Contact Hackaday.
Datzsheet the feedback circuit senses the output voltage is at the desired value, it tells the control circuit to stop charging the capacitor. The feedback circuit notices this and, when the voltage is below the threshold, it tells the control circuit so, which closes the switch again. Notice how it charges then discharges the capacitor. View all 3 project logs. Does this project spark your interest? The images below are purely educational.
But when I connect even very small load, it shuts off. There’s an easy way to identify them. 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.
I think is DAP8A some protection. Here, take a look at the same image with the subdivisions: When nothing connected it is 28V what is modified to be.
Any clue what could be the cause? 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.
The oscillating start only with load.