It also sounds a bit strange to me because the high side FETs do the PWM switching!?ZapPat said:That's right, 2 high side and three low side FETs! Any idea why they might want to do this? Maybe they mostly switch the high side FETs, so traded lower switching loses for higher conduction loses on the top side... but seems a bit strange to me.
electraflyit said:ZapPat,
I'll get a shot for you next time I pull it apart.
fechter,
I saw that controller earlier and it seems a bit diffrent in a few places, specially where the yellow and orange CA wires go. Also their seems to be a second LED near the fets.
On my board where is the hall signal for the CA. Its a bit hard to see but on the left R61 &62 are populated and their is a transistor above them???? could it be a buffer already???
Eddie
The7 said:It also sounds a bit strange to me because the high side FETs do the PWM switching!?ZapPat said:That's right, 2 high side and three low side FETs! Any idea why they might want to do this? Maybe they mostly switch the high side FETs, so traded lower switching loses for higher conduction loses on the top side... but seems a bit strange to me.
Does this controller have regen braking?
electraflyit said:[...] and get a shot from the rear (for ZapPat)
Eddie
biketrials said:Show us the back of your board so we can see what the extra 3 FETs are for... From the PCB component numbering, it looks like the extra 3 are all on the right there, which disagrees with the 3 on the low side theory.....