+ Post New Thread
Results 1 to 6 of 6
  1. #1
    Newbie level 4
    Points: 27, Level: 1

    Join Date
    Jun 2019
    Posts
    6
    Helped
    0 / 0
    Points
    27
    Level
    1

    Help with repair. 12v 3000w inverter

    Hi all.
    First time post for me
    Iím 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 IGBTís)
    But then they blew and many more replacements

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

    Installed. And nothing. Bout 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 IGBTís. They are all good.

    The IGBTís are getting a steady 390vdc
    The spwm getting a steady 5v and 12v
    But I canít 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 current. I donít have a current detection device fitted as it didnít have one from the factory.

    Where do I go from here? I donít own a scope. Only a ddm.

    Thanks in advance

    •   AltAdvertisement

        
       

  2. #2
    Member level 2
    Points: 938, Level: 6

    Join Date
    Oct 2015
    Location
    Helsinki, Finland
    Posts
    46
    Helped
    13 / 13
    Points
    938
    Level
    6

    Re: Help with repair. 12v 3000w inverter

    What is the deadtime setting? According to EGS002 manual, default deadtime is 300ns. Deadtime can be set with solderable jumpers to 1,5us, which would be better for IGBT.



    •   AltAdvertisement

        
       

  3. #3
    Newbie level 4
    Points: 27, Level: 1

    Join Date
    Jun 2019
    Posts
    6
    Helped
    0 / 0
    Points
    27
    Level
    1

    Re: Help with repair. 12v 3000w inverter

    The factory spwm was set to 300ms. So thatís what I used. My egs002 came with no pre made jumps for settings



    •   AltAdvertisement

        
       

  4. #4
    Member level 2
    Points: 938, Level: 6

    Join Date
    Oct 2015
    Location
    Helsinki, Finland
    Posts
    46
    Helped
    13 / 13
    Points
    938
    Level
    6

    Re: Help with repair. 12v 3000w inverter

    The modules I can see on Ebay/Amazon seem all be the same, and I think there are positions to solder jumpers to set deadtime. See the attached image. Desoldering jumpers JP7 and JP8 and soldering JP3 and JP4 should change deadtime to 1,5us, but this is just based on the image on Ebay and the manual. Of course, your board might be different.


    Click image for larger version. 

Name:	EGS002 board deadtime setting.png 
Views:	5 
Size:	479.3 KB 
ID:	153827

    Click image for larger version. 

Name:	jumper settings.png 
Views:	2 
Size:	261.4 KB 
ID:	153828



  5. #5
    Newbie level 4
    Points: 27, Level: 1

    Join Date
    Jun 2019
    Posts
    6
    Helped
    0 / 0
    Points
    27
    Level
    1

    Re: Help with repair. 12v 3000w inverter

    Yeah. Thatís correct. They are all the same. Using the same asic
    I have ordered myself a 2ch usb scope. So before I go changing any of the settings, I want to scope the pwn outputs. Iím currently thinking I have a duff spwm.
    I will let you know the outcome.
    What benefit would I have for using 1.5us?



    •   AltAdvertisement

        
       

  6. #6
    Newbie level 4
    Points: 27, Level: 1

    Join Date
    Jun 2019
    Posts
    6
    Helped
    0 / 0
    Points
    27
    Level
    1

    Re: Help with repair. 12v 3000w inverter

    So I got ANOTHER egs002 from Amazon. And a usb scope. Old egs002 had a waveform that looked totally different to new one. So I installed new board. Switch on. Nothing. Looks like itís popped yet another pair of IGBTís. Wtf is going on. All new components. A factory build inverter and it just doesnít want to know

    - - - Updated - - -

    the screen shot on its own shows the new board with a filter on output 3 and 4

    Click image for larger version. 

Name:	64951242_1144913869029602_1649327919098494976_n.jpg 
Views:	1 
Size:	497.1 KB 
ID:	153864

    the double image shows the first and second egs002 waveforms both without filters.

    - - - Updated - - -

    Click image for larger version. 

Name:	Untitled.png 
Views:	2 
Size:	178.0 KB 
ID:	153868

    double screen shot



--[[ ]]--