[Wuhan University of Technology School Competition] DC Motor Control System

Team member Zheng Jiachen, Ji Jiawen, Sun Qian

and instructor Zhang Jialiang

won the second prize at the school level .

They can complete

(1) The system uses +12V power supply and makes a boost circuit to provide +15V power supply for the motor. This
boost circuit requires a maximum error of output voltage of ±3% under resistive load conditions, and a maximum output current of ≥3A.
Under full load, the efficiency is ≥90%, and the ripple is less than 200mVpp; under inductive load (DC motor no-load
movement ), the maximum error of the output voltage is ±6%, and the ripple is less than 500mVpp. (15 points)

Improvement part: When all the above indicators are met, significant
optimization (accuracy, load capacity, etc. doubled, ripple reduced by half, efficiency increased by 5%), and you can obtain Extra
points. (5 points)

(2) Make an auxiliary power supply that meets the normal working requirements of the system and
supplies power The system quiescent current is required to be less than 5mA. (That is: the system needs to reduce
power consumption . During system testing, an ammeter will be connected in series to the input end to monitor the system operating current). (5 points)

(3) Make a motor drive circuit that can realize motor polarity switching (forward and reverse switching), can output
instantaneous maximum current ≥10A, rated current ≥5A, and working voltage 12-24V. (10 points)

(4) To make a motor current detection circuit, the system requires a single power supply, the current monitoring accuracy is better than
1%, and when the current changes dynamically, the monitoring bandwidth is >1KHz, and the detection results are transmitted to the computer for display through the wireless transmission module
. (20 points)