OSU ECE 5463 - DC-Motor-Driver (6 pages)

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DC-Motor-Driver



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DC-Motor-Driver

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Pages:
6
School:
Ohio State University
Course:
Ece 5463 - Introduction to Real Time Robotics Systems

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DC Motor Driver Take class notes Types of Driver 1 Push Pull amplifier 2 Pulse width modulation PWM 3 Control of current Push pull amplifier see circuit posted on the course website Assume current into the load is positive upper two transistors on negative lower two on Provides a voltage output at high current levels Analysis Zero voltage Diode drop is not significant MC 1533 operational amplifier Output current 15 20 1 1 I is provided to the motor is from the amplifier Pulse width modulation PWM PWM is the most popular deriver circuit 24 T 50 s equivalent to a 20 KHz switching rate which must be faster than the response speed of the motor so that the average voltage is seen by the motor Advantages Full voltage across motor Circuitry reasonable simple On off mode so that bias of the transistors is not critical and transistors consume little energy Typical PWM driver circuit H bridge of Power EFT s 24 Gate Source RFM 12P08 P channel FET Drain Sensor resistor RFM 12N08 N channel FET For DN or UP when input Vgs Vth on For DN or UP when input Vgs Vth on Use computer for PWM Use 9 bits to modulate the pulse and 1 bit for the sign 10 bits all together Resolution 50 s 512 0 1 s resolution for pulse width between 0 and 50 s What is the function of the diodes in the PWM circuit



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