Hi All,
Long time no post, will jump straight to the point.
I have 2x 24V motors(off a wheelchair) which i plan to build a controller for.... their heavy duty motors which will be powering an electric kids car(containing 2 kids) so there may be some large current draws happening(I’m not sure on figures ATM but I expect stall currents of about 30ish amps....)
I tore down the speed controller, and the "heavy duty" bit is using the following:
BUZ111S Mosfets all N-Channel
IR2110(discontinued I think...) High/low side N channel driver.
This gives an upper limit of about 80A(“Id” of 80A on the mosfets)
This originally was the route I was going to go down, i was going to build a circuit with the IR2110 and some spec’ed out Mosfet. However the replacement to the IR2110 which is the IRS2110 quotes gate drive supply range from 10v to 20v, now i was under the impression that to drive a high side mosfet at 24 volts the gate needs to be higher than the drain? So this replacement won’t meet me requirements? Please correct me if i am wrong, i am very new to all of this, but eager to learn!
The other plan i have is to use a BTN7960B..
https://www.infineon.com/cms/en/product/power/motor-driver/integrated-half-bridge-driver/BTN7960B/productType.html?productType=db3a304413719f72011372e9554e00daWhich is actually used on the following:
https://www.jameco.com/Jameco/Products/ProdDS/2128534UsersManual.pdfThis has a supply voltage within my spec(max supply V = 45V)
And according to the specification sheet for the megamoto(linked above) the following current specs:
13A cont. at 100% duty cycle
12A cont. at 70%
30A - 5 second peak
My concerns are around the peak current being a tad low should my kids decide to drive forward with the car up against a wall(motors stalled)(I have an impact detection idea I plan to implement into the design preventing this, however I cant cater for every variable and want to ensure the current limits are in spec )
My main question is, is the BTN7960B out of spec? Has anyone had any experience with working with one of these? I feel like I am overlooking something, considering iv gone from a motor controller with 8 heavy duty mosfets with 4 drivers to 4x System on chip solution....
Id loves your feedback on all of this! As I mentioned I am quite new to all of this so bear with me, but I have got a bit sick of reading/watching videos and I want to try/fail at a few things to further my learning, and what better a project then an electric car for my kids!? (famous last words right there!!)
Thanks,
Tom.