Sensored BLDC Controller (MC33035)

[rascupanamuha]

Hi !

I have finally registrated to this forum, and this is my first post here
I am really into this whole EV world, and so far i made few small electric scooters all by myself. Now i am planning to make next version of my mini electric scooter, but now i want it to has home-made sensored BLDC controller

I have found "Simple BLDC Controller" topic but i dont know if a circuit at the first page works or not..
My MC33035 & MC33039 schematics dont work and i really dont know why. I have made it with a help from their datasheet and few other links

PLease, help me with my controller if you see something wrong or if you know that someone has similar schematics (with IR2101 drivers)

Thank you,

Dominik

 

[SjwNz]

I have only had a quick look but I have seen a couple of things.
Your gate resistors are 10K ? should be around 10 to 40ohms.
also your 1N4148 diodes across and Gate resistors should be Shockley diodes with a resistor in series with the diode which will control the turn off time.
R9 470K in the power section with the C4(100nF) cap will have a long Time Constant and will take to long to respond.
I have not used the 33035 so would have to look at data sheets.

 

[rascupanamuha]

Hi,

I have been looking and searching about this BLDC controller the whole day
And here is the result. I have changed mosfet driver chips, DCDC converter is also new... I have made major changes...

But what you think about it now? Should it work? And one more question... Where can i put "line" in shematics to make 2 like previous? Maybe between mosfet drivers and the left side of schematics?

 

[SjwNz]

your current detection section is still using high value resistors and will cause the 33035 to not response fast enough to changes in current.
also I see a 10k trimpot connected to pin 9 which I guess you want to use to adjust the current, this will not work as you then have a 0.1uF cap which will slow down the response as well.
look at current detect section on the Simple BLDC Controller thread by Jeremy Harris and use his values.
Also you current sensor looks like one of those Halleffct sensors and the Bidirectional types have a 2.5V output at 0amps with will not work with your setup,
you may have to use a Unipolar type which has a output voltage of 0V at 0amps. Or just use the Shunt Resistor method .

did you read all of the Simple BLDC Controller thread by Jeremy Harris.

Where can i put "line" in shematics to make 2 like previous? Maybe between mosfet drivers and the left side of schematics?

I dont understand this question.

 

[rascupanamuha]

I am using 100K resistor beacuse i think lower value would couse a lot of noise.
About that 0.1uF capacitor, do you think it is not necessary? If so, i could just not solder it.
Yep, you are right about current sensor, it is ACS758-100U, so it is unidirectional. The reason i am not using sense resistors is because i dont know where to buy them with that low resistance (0.005 ohm or less)

Where can i put "line" in shematics to make 2 like previous? Maybe between mosfet drivers and the left side of schematics?

I dont understand this question.

I thought about making 2 boards like Jeremy did (Control board and board with mosfets). So i asked if it is better to put mosfet drivers to the control board or to the mosfet board. But in the end i made a single PCB with all the components on my last schematics on it

 

[SjwNz]

all the major electronic suppliers will have these low value current shunt resistors. E14 , digi-key , Mouser.
And values like 100ohm and 0.1uF is what you should be looking at for the RC filter used in the current shunt section.
I found that on page 6 of this application note and Jeremy is using these values as well.
http://www.onsemi.com/pub_link/Collateral/AN1046-D.PDF