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  #1001  
Old 10-26-2015, 04:09 PM
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Default Re: Another homebrew AC-controller

Well done tom. great to see the boards worked out Where do you source the honda inverters out of interest?
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  #1002  
Old 10-26-2015, 04:11 PM
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Default Re: Another homebrew AC-controller

Japanese car recyclers here in the Netherlands, Inverter complete with bus caps in a nice package. They cost about 100 euros a piece.
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  #1003  
Old 10-26-2015, 05:11 PM
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Default Re: Another homebrew AC-controller

oh yeah! very easy , this price is comfortable for my pocket! but can you put some photo? thx
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  #1004  
Old 10-28-2015, 04:07 PM
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Default Re: Another homebrew AC-controller

got it all in a box, unfortunately could not find a shorter one, i need 35mm in height for the connector. But i could only find 60mm tall ones.

The black box (on top), contains the main board +h103, is 113mmx190mmx61mm. I need the 190mm for cable management and an extra relay to switch the Honda Ima inverter on and off.

For testing this is fine. If there is enough interest, I could look into redesigning the main board to fit under the existing Cover of the Honda inverter. This is tricky due to the fact the large lump is the bus and snubber cap which is part of the cover.
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  #1005  
Old 10-28-2015, 06:17 PM
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Default Re: Another homebrew AC-controller

Looking great, sir!!
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  #1006  
Old 10-29-2015, 02:28 AM
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Default Re: Another homebrew AC-controller

Thats a great source for a compatible power stage!

You are using the existing gate drivers, so in effect you only need the main board?
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  #1007  
Old 10-29-2015, 12:22 PM
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Default Re: Another homebrew AC-controller

only the main board hooked up to the mainboard of the IMA inverter.

Just one resistor divider for the current sensor. 5v range to 3.3v range.
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  #1008  
Old 10-29-2015, 12:37 PM
coleasterling coleasterling is offline
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Default Re: Another homebrew AC-controller

For fear of sounding dumb, I'm interested to see how this works at high currents. I read a few references to hardware over-current protection. Is it hooked up in a way that allows the main board to still control the ready signals to the gate drivers?
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  #1009  
Old 10-29-2015, 12:40 PM
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Default Re: Another homebrew AC-controller

Quote:
Originally Posted by coleasterling View Post
For fear of sounding dumb, I'm interested to see how this works at high currents. I read a few references to hardware over-current protection. Is it hooked up in a way that allows the main board to still control the ready signals to the gate drivers?
I have no clue what you mean about this? The overcurrent protection is based on the main board (added on board) and will just stop the pwm signal from reaching the gate drivers.

Its based on a logic gate comparing the feedback from the current sensor to a level set by the micro. So if the phase current exceeds the max it stops the pwm.
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  #1010  
Old 10-29-2015, 12:59 PM
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Default Re: Another homebrew AC-controller

Sorry for the confusion there, I realized it doesn't make much sense, either.

The datasheets for similar gate driver chips from Hitachi reference hardware over-current protection in the driver chip. If it senses over current, it shuts down the driver and throws a fault.

One, I am wondering how that's handled in the ECN3082A Honda had made (and the whole driver board). And two, if the original main board sees a fault, how will that affect the drive with your new board on top?
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