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Homework answers / question archive / Pulse-Width-Modulation (PWM) and Filter Characteristics SuH VI=0 V Pulse SR V2=10v $0 5ohm 10DUF PW-7
Pulse-Width-Modulation (PWM) and Filter Characteristics SuH VI=0 V Pulse SR V2=10v $0 5ohm 10DUF PW-7 .508 PER-10Us Objective: This exercise shows v (f)= 1, which is equal to the average of the switching- frequency input voltage v.(f) , provided the L-C resonance frequency of the low-pass filter is significantly lower than the switching-frequency f. Exercises: () Plot the input voltage v, and the output voltage v. for the last 10 switching cycles where v. waveform has reached its steady state. 2) How does I' relate to the average of v, ? 3) From the simulation window, under View, look at the Output file for the Fourier components of v, and v. . Are the averages of the two the same? How does the fundamental frequency in the input voltage relate to its switching frequency? In this circuit, what is the ratio of the switching frequency to the L-C resonance frequency? What is the attenuateon of the fundamental-frequency component by the filter at the switching frequency?
