Search results

Date Relevance Most replies

  1. SjwNz

    DIY 6FET Controller help

    Hi All. Came across this scope. https://www.youtube.com/watch?v=I7ppDNLlEL4
  2. SjwNz

    OSHW TO247 IGBT watercooled laminated half-bridge

    That may of been me ? I posted about not seeing desat in your Sch on page 1, but then I clicked on the link and saw your did have desat so deleted the post as I felt a bit silly. I think it was Futterama, he did some tests and was talking about the leakage current through the Zener/schottky...
  3. SjwNz

    DIY 6FET Controller help

    Hi All Its been a while since I did anything on my bike and I haven't used it for almost a year as I spend most of last year making this silly mower. https://www.youtube.com/watch?v=vai5NOIvKbQ&t=3s But over the last week I have removed the optical sensors use for motor position and gone to...
  4. SjwNz

    Speed controller design (Based on arlo's Game Changer)

    The ISO5852S looks good to me but I see it uses Capacitive Coupling instead of Opto Coupling and not sure if there would be any issues with that. Not sure about the single DC/DC supply for all the Low sides, its common to have a DC/DC for each low Side. And you will need Dead Time, If you...
  5. SjwNz

    Speed controller design (Based on arlo's Game Changer)

    Like marcos said in his post above, you really should have desat protection. It saved my small controller many times while I was trying to get it going. The best thing I learnt from this forum was Desat.
  6. SjwNz

    Custom Controller Build + Needed Feedback! :)

    Just solder on some extra wire to the tracks, I added 2 layers of 0.3mm think copper sheet on my controller but was running around 80amps. Maybe have a look for a PCB track current calculator to get an idea of track width. Do you have a circuit diagram.
  7. SjwNz

    Micro Lebowski Controller - DIY 3kw

    I have 4468s in my controller and I run 150amps phase, I even increased phase current to 200amps for a couple of rides and it didn't blow up but I have backed it down to 150amps phase again.
  8. SjwNz

    Custom Controller Build + Needed Feedback! :)

    I am no good at calculations but after looking at different deigns over the years I saw a number of controllers in the 1 to 3kw power range were using 10uF for the bootstrap cap and I used 10uF on my first controller. That power module looks nice, but I would be worried about heat and think it...
  9. SjwNz

    RC motor torque.

    RC motors spend there life in RC planes or helis with lots of air passing through the motor so thats why there are no out the shelf fans. I am using the Rotormax 50cc BLDC motor in my E-Bike but I am only runing it up to 3kw max which is around 1/2 its max power so it says at a nice temperature.
  10. SjwNz

    DIY 6FET Controller help

    Haha, look what I found.
  11. SjwNz

    DIY 6FET Controller help

    Just came across these, maybe useful for someone. I mite use them in a work project. http://www.digikey.co.nz/en/product-highlight/r/recom-power/dcdc-converters?WT.srch=1&mkwid=sgrXOlHls&pcrid=64697050346&pkw=_cat%3Adigikey.co.nz&pmt=b&pdv=c
  12. SjwNz

    Arlo's power stage Leaf controller runs and drives page 103

    The newer 337J driver chip is using a desat resistor of 1k now instead of the 100ohm that the 333J chip used. I started to use the 337 at work for a job.
  13. SjwNz

    Game Changer Page 3 with video of 1700amps!!!!

    CNC plasma cutter :D
  14. SjwNz

    Arlo's power stage Leaf controller runs and drives page 103

    I think when the 333J turns on, the gate voltage will be approx 13V due to the 3 diode drop thing if you have a 15v supply. The resistor will keep a small load on the gate output and the gate voltage will stay at this Vcc2 - 3 diode drop. without the resistor and when current stops following...
  15. SjwNz

    Nucular electronics - complete kit for ev!

    I am only running the Rotomax 50cc motor at 3kw with my DIY controller but would like to play with the 150cc some time in the future. Good work on your Controller, I want to try Sensor-less sometime.
  16. SjwNz

    Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15

    Theres that Isolated Opamp thing I have used.
  17. SjwNz

    Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15

    I have been using this little Isolated opamp below to measure upto a 600vdc supply for a circuit I made for a customer. AVAGO TECHNOLOGIES HCPL-7520-000E Isolation Amplifier. I can post a circuit I used for it if you like.
  18. SjwNz

    Arlo's power stage Leaf controller runs and drives page 103

    Haha, your no load power rating is my full power rating :D good to see you have solved your issues.
  19. SjwNz

    DIY 6FET Controller help

    yes 12fets total (2 in parallel) with 200amp phase and the AvgBatt current will be around 70 - 80amps.
  20. SjwNz

    DIY 6FET Controller help

    Back to 150amps now but it was good to see if it would handle 190 amps phase for a short time. Looks like I need to make a 12 fet controller now as I really want to run at 200 amp phase.
  21. SjwNz

    DIY 6FET Controller help

    I got my priorities all wrong, I spent my money I put aside for a Diff probe and got a chainsaw :) Will get Diff probe early next year now and will get the PICO TA042 which is the 100MHz 1000v unit 1st and then maybe look at getting a cheaper 25MHz probe later on as well. Will be nice to look...
  22. SjwNz

    DIY 6FET Controller help

    I was thinking the 100MHz bandwidth was a bit overkill, but I was wondering if this would mean it would have a better CMRR at the frequency's we are looking at with speed controllers. With the cheaper diff probes its nice to connect to anywhere in the circuit but would I get more common mode...
  23. SjwNz

    DIY 6FET Controller help

    Been looking at buying a differential probe as the one i have been using I borrowed. Was wondering what probes fellow ES members have been using. I am looking at a used Tektronix P5205 from Ebay but I will also have to get a special power supply to use it which gets the price much higher. (...
  24. SjwNz

    DIY 6FET Controller help

    I was hopefully looking at the correct layout, I followed your thread sometime ago but from memory it was a 4layer design? I downloaded KiCad and open the PCB file on the first page of your My new 18 FET TO-247 layout riding video page 10 and I like how you did your laminated bus using the...
  25. SjwNz

    DIY 6FET Controller help

    I will try and work on this next week as I have run out of time for the week. got mountain bike racing tomorrow and a motorbike track day on Thursday then back to the farm for the weekend doing farm stuff. I just finished testing 3 different types of fets on a simple 1/2 bridge board I made...
Back
Top