Question 4 : Design an analog pulse-width modulated (PWM) signal generator in order to drive a servo motor. a) What is the definition of modulation and what are pulse-width, pulse-position and pulse-density modulations? b) What is the relaxation oscillator? Design an OpAmp based (comparator based) relaxation oscillator and explain how it works. Does it works in linear or nonlinear (saturation) region? What is the type of the output wave (sinusoidal, rectangular, square etc.)? How is the oscillation frequency calculated? At the end, set the circuit parameters to the values that yields 1 kHz ocillation frequency. c) Which OpAmp building block converts a square wave into a triangle wave. Design this building block with a sufficient output amplitude. Note the frequency of the output signal. d) Design an OpAmp building block that compares the triangle wave with a DC threshold voltage. e) Combine the relaxation oscillator (b), the waveform transformer (c), and comparator block in a cascaded form. Set the circuit parameters that adjusts the threshold voltage in order to get D% dutycycle at the PWM output, where D is 22.

Question 4 : Design an analog pulse-width modulated (PWM) signal generator in order to drive a servo motor. a) What is the definition of modulation and what are pulse-width, pulse-position and pulse-density modulations? b) What is the relaxation oscillator? Design an OpAmp based (comparator based) relaxation oscillator and explain how it works. Does it works in linear or nonlinear (saturation) region? What is the type of the output wave (sinusoidal, rectangular, square etc.)? How is the oscillation frequency calculated? At the end, set the circuit parameters to the values that yields 1 kHz ocillation frequency. c) Which OpAmp building block converts a square wave into a triangle wave. Design this building block with a sufficient output amplitude. Note the frequency of the output signal. d) Design an OpAmp building block that compares the triangle wave with a DC threshold voltage. e) Combine the relaxation oscillator (b), the waveform transformer (c), and comparator block in a cascaded form. Set the circuit parameters that adjusts the threshold voltage in order to get D% dutycycle at the PWM output, where D is 22.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.2P

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