The inverting op-amp circuit in Figure 9.9 has parameters R 1 = 20 k Ω , R 2 = 200 k Ω , and A o d = 5 × 10 4 . The output voltage is v o = − 4.80 V .(a) Determine the closed-loop voltage gain. (b) Find the input voltage.(c) Determine the voltage at the inverting terminal of the op-amp. (d) Using v I from part (b), find the percent error in output voltage compared to theideal value.
The inverting op-amp circuit in Figure 9.9 has parameters R 1 = 20 k Ω , R 2 = 200 k Ω , and A o d = 5 × 10 4 . The output voltage is v o = − 4.80 V .(a) Determine the closed-loop voltage gain. (b) Find the input voltage.(c) Determine the voltage at the inverting terminal of the op-amp. (d) Using v I from part (b), find the percent error in output voltage compared to theideal value.
Solution Summary: The author explains the value of the closed loop voltage gain, which is -9.9958.
The inverting op-amp circuit in Figure 9.9 has parameters
R
1
=
20
k
Ω
,
R
2
=
200
k
Ω
, and
A
o
d
=
5
×
10
4
. The output voltage is
v
o
=
−
4.80
V
.(a) Determine the closed-loop voltage gain. (b) Find the input voltage.(c) Determine the voltage at the inverting terminal of the op-amp. (d) Using
v
I
from part (b), find the percent error in output voltage compared to theideal value.
Q2. For the transformer shown in Fig. 1.
A. Plot the winding connection for the transformer and justify your answer.
(4M)
B. If the transformer is adopted in 12 pulse diode rectifier, where two-series connected
bridge rectifiers are used to supply a highly inductive load with 100 A. (i) Select a
suitable turns ratio for the transformer (ii) Plot the line current of each winding (
secondary + primary) showing the current magnitude at each interval (iii) Use Fourier
Page 1 of 3
analysis to obtain the Fourier series of all line currents then calculate the THD of the
input current.
(8=0°
(16M)
(Y) = 30°
Fig. 1
P. I v
I
Q2. For the transformer shown in Fig.1,
A. Find the phase shift between the primary and star-connected secondary.
B. If the transformer is adopted in a 12-pulse diode rectifier, where a two-series
connected bridge rectifier is connected in series and supplies a highly inductive load
(i) Select a suitable turns ratio for the transformer
(ii) Plot the line current of each winding (secondary + primary).
(iii)Using Fourier analysis to obtain the Fourier series of all line currents, then calculate
the THD of the input current.
(iv) Draw the output voltage of the first and second rectifiers and give the relation of
the total output voltage.
N2
B
C
Fig. 1
N3
a
Q2.A. It is planned to use the transformer shown in Fig. 1, a 12-pulse rectifier. Each
secondary is connected to three phase controlled bridge rectifier. The two rectifiers
are connected in series to supply a highly inductive load.
1. Based on the phasor relationship between different windings. If suitable turns
ratio is selected, is it possible to use this transformer to produce 12 pulse
output voltage? Show the reason behind your answer.
2. Assuming this arrangement is possible to be used in 12-pulse rectifier, draw
the output voltage of the 1st and 2nd rectifier and give the relation of the total
output voltage.
3. Use the Fourier analysis to show the harmonics in all line currents of the
transformer.
A
B
in
C
Fig. 1
b
la
a
2
b.
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