Jump to content
Electronics-Lab.com Community
Stockleys

12v 3000w inverter repair help

Recommended Posts

Hi all. 
First time post for me
I’m after some help
I am trying to repair a high frequency 3000w inverter.
It worked great for 3 weeks when I got it (after replacing 2 IGBT’s)
But then they blew and many more replacements

I bought a new spwm board from the manufacturer and a complete new set of IGBT’s along with their associated resistors and diode.

Installed. And nothing. ABout 10 seconds in and one of the h bridge drivers exploded.

So I ordered an EGS002 board from amazon. All pinouts exactly the same. Same chips as the spwm from the manufacturer only a third the price.

I have installed this and tested all components around it including the IGBT’s. They are all good.

The IGBT’s are getting a steady 390vdc source. 
The spwm getting a steady 5v and 12v
But I can’t get an output. I can hear the transformers buzz for 3 seconds then stop I get a blip of up to 8vac at the output. 

The spwm board flashes out the code for under voltage and over voltage. 

Where do I go from here? I don’t own a scope. Only a ddm. 

I have checked and re check all components and solder joints.  But as I don’t own a scope, I can’t think what else to do.
Thanks in advance

Share this post


Link to post
Share on other sites

Without a circuit diagram it is very difficult to help you.  You can find numerous videos on youtube.com related to "EGS002 "   that maybe helpful. Good luck.

Looks like I was born under the sign  -V  (I talk to much?)

 

Share this post


Link to post
Share on other sites

I got myself a usb scope.   

I found that the egs002 wasn’t giving the correct wave.  On outputs 1 and 2.   And output 3 was a constant 6v.  Not a wave at all.    Got another egs002 (before getting the scope). And that had one dead output.

Attatched is a schematic for the egs002.   And the h bridge.  Which although not for my inverter, is identical   

B0526E47-0F63-4D0C-ADDB-2D90FFD0D2DC.png

D4ACCA77-2189-407E-8F6E-F66AA88AE8DD.png

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
×
  • Create New...