I agree that this design requires a larger number of power transistors. This increases the overall cost. But this replaces a mechanical gear box, plus differential, plus...
And I don't understand why power transistors should be larger than for other designs for similar power motors.
series resistance is the limiting issue with this design.
Things helping this issue:
Larger slow, low RdsON devices can be used (compared to PWM optimized devices)
Things hurting this design:
Way to large a volt second bandwidth across "gears". So components will be large for the worst case.
also current bandwidth is large increasing component size and cost to be able to handle worst case.
Clever and interesting nun the less.
My Mom the Radio Star Max MaxfieldPost a comment I've said it before and I'll say it again -- it's a funny old world when you come to think about it. Last Friday lunchtime, for example, I received an email from Tim Levell, the editor for ...
A Book For All Reasons Bernard Cole1 Comment Robert Oshana's recent book "Software Engineering for Embedded Systems (Newnes/Elsevier)," written and edited with Mark Kraeling, is a 'book for all reasons.' At almost 1,200 pages, it ...