Sunday, June 1, 2014

RE: [Electric Boats] Motor Controller - transistors and questions....

 

IIRC to parallel MOSES each one needs a gate resistor.


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-------- Original message --------
From: "oak oak_box@yahoo.com [electricboats]"
Date:06/01/2014 8:45 PM (GMT-08:00)
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Motor Controller - transistors and questions....

 

QUESTION: Can power mosfet's be put in parallel successfully? (it seemed that when I tried this in the past, one of them would heat up much more than the other) 
 
I did a little looking around on Mouser, and found the following transistors:
 
 
P-channel:
http://www.mouser.com/ds/2/427/73010-279659.pdf (For me, worked on Chrome, but not Internet Explorer...)
SUP90P06-09L - P ch, 60V, 90A $3.84
N-channel:
IXFK230N20T
200V, 230A, n ch, $18.83 ea
N-channel:
IRFB4115PbF
150V, 104A, n ch, $3.94 ea
 
 
It seems much harder to find P-channel transistors at higher voltage levels than N-channel transistors. 
 
I'm assuming that general practice would be to design for only 50% (or less?) of the rated power of the device, so using the P-ch transistor, it would be better for a 24V circuit, and pushing it to go to a 48V circuit.
 
Maybe 48V at up to 40A or so (assuming you can dissipate the heat from it!).  This would get me up to 1900W, which would pretty closely meet my needs.
 
Thanks,
John
 
 

 
From: "Mark F mark.internet@yahoo.ca [electricboats]" <electricboats@yahoogroups.com>
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Sent: Sunday, June 1, 2014 7:34 PM
Subject: Re: [Electric Boats] Re: strange motor controller idea

 

I have looked into pwm before, I understand the how to provide pwm with a microcontroller, but don't really feel comfortable with how to configure the FET's and which ones to use for 96 volts.

Would you have any references that would be good for this?

Thanks

From: "wewhite74@gmail.com [electricboats]" <electricboats@yahoogroups.com>
To: electricboats@yahoogroups.com
Sent: Sunday, June 1, 2014 4:33:41 PM
Subject: [Electric Boats] Re: strange motor controller idea

 
Better to use the pwm from the low voltage controller to drive a higher voltage H Bridge setup of FETs
small pwm generator can be as simple as a 555 chip with some caps and resistors driving 4 fets for the H-Bridge





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