Modding of the pulse power supply unit ARPV-SC1E-12005T
I bought this power supply unit somehow, I was lying around for a long time and decided to adapt it, but the weekend 12B didn’t suit my needs. It was decided to redo it.
Photos of entrails:
Link to the documentation for this power supply.
First, it was necessary to figure out what he was, for this it was necessary to draw a schematic diagram. The difficulty of dialing, and without it it is very difficult to track where the track goes, was that the board was varnished, and you had to remove it with a scalpel. The result was a rough picture:
The primary circuit to consider in this case, IMHO, it makes no sense ...
So, the voltage on the secondary circuit is directly dependent on the feedback (OS) on the LED of the optocoupler, which is set by a divider based on the transistor.
')
To increase the voltage you need:
1) Reduce the resistance of the lower resistor divider R12 (3.9kΩ)
2) Bear in mind that the filter capacitor is rated for 16V, which means that when the voltage is above 16V, the capacitor of the corresponding voltage must be suitable
3) The output of the circuit is a stabilitron of about 14.8V (it was determined empirically), which means either to evaporate (it is protective, against overvoltage) or to replace it with a larger nominal
To reduce stress:
1) Increase the resistance of the lower resistor divider R12 (3.9kOhm)
2) Skip
3) Also replace with the required zener diode or vypaaem
It should be borne in mind that when the voltage increases, the output current decreases, in what proportion I cannot say, you can proceed from P = UI, but I’m not sure that everything is so simple ... - all at your own risk.
I needed an output voltage of 14.5V, for this I soldered the 15kΩ resistor in parallel to the 3.9kΩ resistor, as a result, the resistance became ~ 2.7kOhm and the output voltage of 14.5V was a profit!
Photos of entrails:
Link to the documentation for this power supply.
First, it was necessary to figure out what he was, for this it was necessary to draw a schematic diagram. The difficulty of dialing, and without it it is very difficult to track where the track goes, was that the board was varnished, and you had to remove it with a scalpel. The result was a rough picture:
The primary circuit to consider in this case, IMHO, it makes no sense ...
So, the voltage on the secondary circuit is directly dependent on the feedback (OS) on the LED of the optocoupler, which is set by a divider based on the transistor.
')
To increase the voltage you need:
1) Reduce the resistance of the lower resistor divider R12 (3.9kΩ)
2) Bear in mind that the filter capacitor is rated for 16V, which means that when the voltage is above 16V, the capacitor of the corresponding voltage must be suitable
3) The output of the circuit is a stabilitron of about 14.8V (it was determined empirically), which means either to evaporate (it is protective, against overvoltage) or to replace it with a larger nominal
To reduce stress:
1) Increase the resistance of the lower resistor divider R12 (3.9kOhm)
2) Skip
3) Also replace with the required zener diode or vypaaem
It should be borne in mind that when the voltage increases, the output current decreases, in what proportion I cannot say, you can proceed from P = UI, but I’m not sure that everything is so simple ... - all at your own risk.
I needed an output voltage of 14.5V, for this I soldered the 15kΩ resistor in parallel to the 3.9kΩ resistor, as a result, the resistance became ~ 2.7kOhm and the output voltage of 14.5V was a profit!
Source: https://habr.com/ru/post/198782/
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