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2. The de source supplying a single-phase inverter with is 99 V. The load is an R. L series combination with R=30 N and L=20 mH. The converter is controlled by PWM switching scheme. The output voltage has a fundamental frequency of 50 Hz. (a) Specify amplitude modulation ratio ma to provide a 42-V rms output voltage at the fundamental frequency (b) If frequency modulation ratio mƒ is 17, using the harmonics table, determine THD of the load current Vn Vdc Note: The normalized Fourier Coefficients V for bipolar PWM is given in Tab below (see also Table 8-3 in textbook). in text book indicates the first harmonics in the output for bipolar PWM. Hence, for n = mf (nth harmonic ) m₁ = Vf. (Note that ma related to the n = 1, n = mƒ, and n = mƒ ‡ 2 are given in Table 8-3 below) Vdc

2. The de source supplying a single-phase inverter with is 99 V. The load is an R. L series combination with R=30 N and L=20 mH. The converter is controlled by PWM switching scheme. The output voltage has a fundamental frequency of 50 Hz. (a) Specify amplitude modulation ratio ma to provide a 42-V rms output voltage at the fundamental frequency (b) If frequency modulation ratio mƒ is 17, using the harmonics table, determine THD of the load current Vn Vdc Note: The normalized Fourier Coefficients V for bipolar PWM is given in Tab below (see also Table 8-3 in textbook). in text book indicates the first harmonics in the output for bipolar PWM. Hence, for n = mf (nth harmonic ) m₁ = Vf. (Note that ma related to the n = 1, n = mƒ, and n = mƒ ‡ 2 are given in Table 8-3 below) Vdc

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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2. The de source supplying a single-phase inverter with is 99 V. The load is an R. L series combination with R=30 N and L=20 mH. The converter is controlled by PWM switching scheme. The output voltage has a fundamental frequency of 50 Hz. (a) Specify amplitude modulation ratio ma to provide a 42-V rms output voltage at the fundamental frequency (b) If frequency modulation ratio mƒ is 17, using the harmonics table, determine THD of the load current Vn Note: The normalized Fourier Coefficients V for bipolar PWM is given in Tab below (see also Table Vdc 8-3 in textbook). in text book indicates the first harmonics in the output for bipolar PWM. Hence, for n = mf (nth harmonic ) m₁ = Vmf. (Note that må related to the n = 1, n = mƒ, and n = mf = 2 are given in Table 8-3 below) Vdc Table Q1(a): Normalized Fourier Coefficients Vn/VDc for Bipolar PWM ma 1 0.9 0.8 0.7 1.00 0.90 0.80 0.70 0.6 0.5 0.4 0.3 0.2 0.1 0.60 0.50 0.40 0.30 0.20 0.10 1.15 1.20 1.24 1.27 0.60 0.71 0.82 0.92 1.01 1.08 0.32 0.27 0.22 0.17 0.13 0.09 0.06 0.03 0.02 0.00 n = 1 n = mf n = mf ± 2
Transcribed Image Text:2. The de source supplying a single-phase inverter with is 99 V. The load is an R. L series combination with R=30 N and L=20 mH. The converter is controlled by PWM switching scheme. The output voltage has a fundamental frequency of 50 Hz. (a) Specify amplitude modulation ratio ma to provide a 42-V rms output voltage at the fundamental frequency (b) If frequency modulation ratio mƒ is 17, using the harmonics table, determine THD of the load current Vn Note: The normalized Fourier Coefficients V for bipolar PWM is given in Tab below (see also Table Vdc 8-3 in textbook). in text book indicates the first harmonics in the output for bipolar PWM. Hence, for n = mf (nth harmonic ) m₁ = Vmf. (Note that må related to the n = 1, n = mƒ, and n = mf = 2 are given in Table 8-3 below) Vdc Table Q1(a): Normalized Fourier Coefficients Vn/VDc for Bipolar PWM ma 1 0.9 0.8 0.7 1.00 0.90 0.80 0.70 0.6 0.5 0.4 0.3 0.2 0.1 0.60 0.50 0.40 0.30 0.20 0.10 1.15 1.20 1.24 1.27 0.60 0.71 0.82 0.92 1.01 1.08 0.32 0.27 0.22 0.17 0.13 0.09 0.06 0.03 0.02 0.00 n = 1 n = mf n = mf ± 2
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