Question: Pure sine wave inverter.

[maxbarjr]

Re: Question: Pure sine wave inverter.

https://www.badcaps.net/forum/attach...1&d=1487674217

Can you show back side of this PWM controller board?
Your board has similar to the board EGS002 that is used a lot in DC-AC inverter. If you search for EGS002 you will see lots of info.
Your board may have a jumper to set 50/60Hz.

Hi budm. Thank you for those attachments. This is interesting. I am out of town now. I will take a picture of the backside of the board when I get home by next week. I will also check if there is a similarity on the schematic you send and the board pwm board on the inverter.

I have electronics background and been repairing boards up to component level. I can draw schematics.

Again, thank you.

[maxbarjr]

Re: Question: Pure sine wave inverter.

I have to remove the board to be able to get a better view of the front and back. So here is is. I don't see any pads that you can short or open to change any functionality. What I think is since this is a PIC, could it be in the program that tells which frequency (50 or 60) it should work?

I am new to microcontrollers so I can't say much what I am seeing.

Thanks.

[budm]

Re: Question: Pure sine wave inverter.

I believe it is more economical for them to use the jumper because all they have to do is look at the board to see if there is jumper is present or not present, if they use two different programs one for each frequency, then they will need some kind of marking that can easily identify which is which board, but if the marking comes off then they will not know which is which. That is why the other board uses jumpers.
But then again we will not know for sure.

https://www.badcaps.net/forum/attach...5&d=1489459256
I see the 0 Ohm resistors R12, R13, R14, R15 because why would you use 0 Ohms in place where it is not used to jump over the traces on the board, just a guess. You may want to look up the spec sheets of those ICs where the 0 Ohm resistors are connected to those pins to see what they are. Otherwise I have no idea unless you can get a hand on 60Hz board version.

[maxbarjr]

Re: Question: Pure sine wave inverter.

I believe it is more economical for them to use the jumper because all they have to do is look at the board to see if there is jumper is present or not present, if they use two different programs one for each frequency, then they will need some kind of marking that can easily identify which is which board, but if the marking comes off then they will not know which is which. That is why the other board uses jumpers.
But then again we will not know for sure.

https://www.badcaps.net/forum/attach...5&d=1489459256
I see the 0 Ohm resistors R12, R13, R14, R15 because why would you use 0 Ohms in place where it is not used to jump over the traces on the board, just a guess. You may want to look up the spec sheets of those ICs where the 0 Ohm resistors are connected to those pins to see what they are. Otherwise I have no idea unless you can get a hand on 60Hz board version.

Wow, I have not noticed those 0 ohms resistors there. Good point. I will leave it from there for now. I will check that up next time.

Thank you budm for your inputs. Really appreciate it.