I have a number of different chinese SMPS boards, they are very affordable seem to perform well.
I've noticed the description on the pcb's listing 2 output types.
That leads me to believe that the output voltage can be set by changing the value of a resistor on the board.
Or
This is a multi-purpose pcb and the other option on the board requires different components altogether
Is it possible to change the output to 36 or 48 volts by changing resistors?
Just to be clear; there a 2 different smps's in the picture. One is listed as 24V 6A, with 48V 4A as a possible alternative. The other one is 24V 9A, with 36V 7A written on the board as alternative
If it is a matter of changing a resistor or 2, I'd like to know where to start experimenting
I've noticed the description on the pcb's listing 2 output types.
That leads me to believe that the output voltage can be set by changing the value of a resistor on the board.
Or
This is a multi-purpose pcb and the other option on the board requires different components altogether
Is it possible to change the output to 36 or 48 volts by changing resistors?
Just to be clear; there a 2 different smps's in the picture. One is listed as 24V 6A, with 48V 4A as a possible alternative. The other one is 24V 9A, with 36V 7A written on the board as alternative
If it is a matter of changing a resistor or 2, I'd like to know where to start experimenting
Attachments
Based on my experiences, increasing voltage more than a few volts requires not only changing a resistor or two, but also modifying trafo windings. In past I modded ATX psu to output 30 0 30 volts once. I have attempted to mod like 10 or more SMPS, but lack of proper tools, patience and knowledge/experience led to me to little success.
Also remember that it is potentially lethal device, more dangerous than simple exposure to mains voltage.
If you still would like to attempt to squeeze extra voltage out out these, look for TL431 or LM358 on board, google the datasheet of switching controller IC. There are some pieces of info around the Web about how to do it.
Also remember that it is potentially lethal device, more dangerous than simple exposure to mains voltage.
If you still would like to attempt to squeeze extra voltage out out these, look for TL431 or LM358 on board, google the datasheet of switching controller IC. There are some pieces of info around the Web about how to do it.
Look for the opto, it is likely controlled by a 431 or ILA130. From there you can likely find two resistors that make up the voltage divider for the 431. its reference voltage is 2.49V according to the datasheet.
It depends on type of SMPS.
Fly back are usually a lot more flexible than LLC.
With LLC the transformer provides a voltage drop ratio.
In fly back the transformer just supplies burst of power and doesn't rely as much on transformer turns ratio.
If the input voltage spec varies a (90-230VAC) lot then its probably fly back.
If input voltage is set or has 2 taps then its more likely LLC.
Fly back are usually a lot more flexible than LLC.
With LLC the transformer provides a voltage drop ratio.
In fly back the transformer just supplies burst of power and doesn't rely as much on transformer turns ratio.
If the input voltage spec varies a (90-230VAC) lot then its probably fly back.
If input voltage is set or has 2 taps then its more likely LLC.