The circuit in Figure 2.5(a) is used to rectify a sinusoidal input signal with a peak voltage of 120 V and a frequency of 60 Hz. A filter capacitor is connected in parallel with R . If the output voltage cannot drop below 100 V, determine the required value of the capacitance C . The transformer has a turns ratio of N 1 : N 2 = 1 : 1 , where N 2 is the number of turns on each of the secondary windings. Assume the diode cut−in voltage is 0.7 V and the output resistance is 2.5 k Ω . (Ans. C = 20.6 μ F )
The circuit in Figure 2.5(a) is used to rectify a sinusoidal input signal with a peak voltage of 120 V and a frequency of 60 Hz. A filter capacitor is connected in parallel with R . If the output voltage cannot drop below 100 V, determine the required value of the capacitance C . The transformer has a turns ratio of N 1 : N 2 = 1 : 1 , where N 2 is the number of turns on each of the secondary windings. Assume the diode cut−in voltage is 0.7 V and the output resistance is 2.5 k Ω . (Ans. C = 20.6 μ F )
Solution Summary: The author explains the capacitance required to limit the ripple voltage of a full-wave rectifier circuit with center-tapped transformer.
The circuit in Figure 2.5(a) is used to rectify a sinusoidal input signal with a peak voltage of 120 V and a frequency of 60 Hz. A filter capacitor is connected in parallel with R. If the output voltage cannot drop below 100 V, determine the required value of the capacitance C. The transformer has a turns ratio of
N
1
:
N
2
=
1
:
1
, where
N
2
is the number of turns on each of the secondary windings. Assume the diode cut−in voltage is 0.7 V and the output resistance is
2.5
k
Ω
. (Ans.
C
=
20.6
μ
F
)
C'uk Converter Design
A C'uk converter has an input
of 12 V and is to have an output of - 24 V supplying
a 60 W load. Select the duty ratio, the switching
frequency, the inductor sizes such that the change
in inductor currents is no more than 12 percent of the
average inductor current, the output ripple voltage
is no more than 1.5 percent, and the ripple voltage
across C1 is no more than 3 percent.
2. The circuit given below is using a transformer of 230V/30V. The load resistance is 10KS. Find Vin (rms and
peak values), Vdiode and VLOAD (Peak and dc values). Draw the
input and output voltage waveforms. (Si diode)
Vin: Vin rms=
Vin peak
=
VDIODE
Vdiode =
4
Vin
VLOAD: VLOAD Peak =.
Load
VLOAD
VLOAD DC=
2031
Supply
wwwwww
A step down converter is operated with a duty cycle of k = 0.75. The input voltage is Vs = 20V, and the
load is: L = 5mH, R = 1502. The minimum inductor current is I₁ = 0.1A. The maximum inductor
current is:
Select one:
a. 1.9 A
b. None of these
OC. 0.9 A
O d. 1.1 A
Oe. 2 A
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