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Yozshulrajas A simple variable power supply based on the LM 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. Has anyone solved this problem? The original values were 15kOhms for R40 and 2. Notice how it charges then discharges the capacitor. Without load, voltage is stable???
Almost every SMPS feedback circuit works by dividing the output voltage using a voltage dividerthen comparing the divided voltage with a reference voltage.
I reconnected the variable power supply and changed the voltage while measuring the output at the optocoupler. A better view of the optocoupler: The half of it is 2. You want a 5V output voltage and have a 2. Now, suppose your output voltage keeps raising and reach 5. How would you do this? I wiped my webserver and the images got broken. This project was part of my Soldering Station project. Else, if the value is lower than the voltage reference, the comparator tells the control circuit to keep charging the capacitor, because your output value is lower than the desired value.
Test the power iw with a variable voltage power supply. The comparator gets the value and compares it to the voltage reference. As you want a specific voltage on the output aiw voltage sidethe feedback circuit tells the control circuit that the output voltage is below the desired voltage. View all 3 project logs.
I connect the variable power supply to the power supply I want to modify and measure the voltage at the optocoupler. 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 auw and tested the the circuit again.
Any clue what could be the cause? 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.
The control circuit then closes the switch, allowing current to flow from the high voltage side to the low voltage side. I think is DAP8A some protection. Some undervoltage protection, or??? The oscillating start only with load. Related Posts
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Yozshulrajas A simple variable power supply based on the LM 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. Has anyone solved this problem? The original values were 15kOhms for R40 and 2. Notice how it charges then discharges the capacitor.
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