Pics of the Hacker Sport ESC

[GriffinRU]

Originally Posted by lutach

What do you have in mind Artur? I have a Hacker Master Car Race that might need some of your magic.

Same thing as with MambaMax.

I re-worked old, thermalled BK-Electronics ESC with copper plates in-between pcb's and now it works much cooler, plus caps and zener (I am thinking about an option to change zener on-the-fly based on battery voltage).

I can tune your ESC, but that would be after May,24.

[lutach]

Originally Posted by GriffinRU

Same thing as with MambaMax.

I re-worked old, thermalled BK-Electronics ESC with copper plates in-between pcb's and now it works much cooler, plus caps and zener (I am thinking about an option to change zener on-the-fly based on battery voltage).

I can tune your ESC, but that would be after May,24.

Cool. What about a FET change? I've seen a few controllers out there that have some king of extra copper wire instead of just the PCB traces. Can that improve how the ESC eliver it's power?

[GriffinRU]

Originally Posted by lutach

Cool. What about a FET change? I've seen a few controllers out there that have some king of extra copper wire instead of just the PCB traces. Can that improve how the ESC eliver it's power?

I do not think we can gain allot by replacing fets.

Always, but new layouts have power leads right at fet's. Although there is always room for improvement...

[lutach]

Originally Posted by GriffinRU

I do not think we can gain allot by replacing fets.

Always, but new layouts have power leads right at fet's. Although there is always room for improvement...

What I meant to say about the FETs is if they are old with high resistance, would it be better to go with a lower resistance one? Also, a bit off topic, but I keep forgeting to ask you. What is the advantage of adding more FETs to a controller? What needs to be changed? I'm having a hard time trying to figure this out. I've seen many 3-4 board ESC use the same FET driver as a single and double board one. I know there are drivers out there that can put out 3-8A, but what is actually needed to open a lot of FETs? I use a MOSFET Driver Calculator made by Microchip, but it only uses a few simple numbers that can be found on a FET datasheet. It doesn't give an option for multiple FETs though.

[GriffinRU]

Originally Posted by lutach

What I meant to say about the FETs is if they are old with high resistance, would it be better to go with a lower resistance one? Also, a bit off topic, but I keep forgeting to ask you. What is the advantage of adding more FETs to a controller? What needs to be changed? I'm having a hard time trying to figure this out. I've seen many 3-4 board ESC use the same FET driver as a single and double board one. I know there are drivers out there that can put out 3-8A, but what is actually needed to open a lot of FETs? I use a MOSFET Driver Calculator made by Microchip, but it only uses a few simple numbers that can be found on a FET datasheet. It doesn't give an option for multiple FETs though.

BrianG

Microchip calc good tool, but you need to use it multiple times to cover full duty cycle. More fets -> add total gate charge and capacitance, but be aware that fet's parameters are dependent on load. This tool helps to calculate driver for fixed circuits like DC-DC convertors. In addition to verify high side, in H-Bridge, you need to calculate bootstraps diode and caps parameters. As well as rated gate voltage and drives power supply requirements. Then to minimize ringing in mutifets applications you need to add series gate resistor and do the calc again.
In general it is not that bad once you get the entire picture, but can be complex to estimate working parameters across all temps, loads and fets.

P.S. More fets -> it’s like more micro switches which can split the task, but the most important task would be to keep them synchronized!!! And that can be lost quite easy, you've seen plenty of smoke...
It is like single strand in multi-strand wire...

[lutach]

All this information is really good as my design keeps geting better . Right now I know I can design a controller that will be smaller then the Tekin's R1 series. Now, I'm not an engineer and my design might not be possible. To me it makes complete sense and I've seen a couple of controller done the same way, but different layout.