Twist-grip throttle for the 12/24V 20A speed controller

摘要

This circuit was devised to adapt the 12/24V 20A Speed Controller (Silicon Chip, June 2011) to a twist-grip Hall Effect throttle in an electric quadricyle. This was run at 36V instead of 24V to drive a 36V 750W motor. This was possible without upgrading the Mosfets or the Schottky diode but extra supply filtering was required to suppress motor hash.The twist-grip throttle uses a Hall effect device which gives an output ranging from +0.75V at rest position to +3.6V when full on. This needed to be changed to suit the TL494 on the Speed Controller PCB which needs an input voltage which ranges from +0.7V for full motor speed upto about +3V for zero speed.