Dear,
I have two UPS's (inverter with charger) that uses IC SG3525 to generate the PWM signal... The inverter's input is 12V battery and output is 220VAC.
The problem is that the output voltage is not controlled by feedback, meaning that when the battery voltage is say 12.8V the output is 285V as tested, and as the voltage drops the output voltage decreases. Also, as the load increase the output voltage decrease.
I know the buyer very well, he told me he have about 200pcs, so if I found a solution for this problem I could help him very much.
The PCB should be studied, but before, as I know there should be a feedback winding in the transformer, which I can't find in the inverter. The picture clarify it better.
So do you think there is any solution for this problem?
Regards,
Hazim
I have two UPS's (inverter with charger) that uses IC SG3525 to generate the PWM signal... The inverter's input is 12V battery and output is 220VAC.
The problem is that the output voltage is not controlled by feedback, meaning that when the battery voltage is say 12.8V the output is 285V as tested, and as the voltage drops the output voltage decreases. Also, as the load increase the output voltage decrease.
I know the buyer very well, he told me he have about 200pcs, so if I found a solution for this problem I could help him very much.
The PCB should be studied, but before, as I know there should be a feedback winding in the transformer, which I can't find in the inverter. The picture clarify it better.
So do you think there is any solution for this problem?
Regards,
Hazim
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