EMK11303 – ELECTRONICS 1
TUTORIAL 2 ( DIODE APPLICATIONS)
1.Draw the output voltage waveform included the voltage drop and determines the peak
inverse voltage for each circuit.
Fig. 1(a)
1. a)
Fig. 1(b)
4.3V
0
b)
0
-19.3V
2. For Fig. 2, determine:
a) the peak output voltage
b) peak inverse voltage
1:2
+100V
RL = 2 kΩ
-100V
Fig. 2
By: DR LIEW HUI FANG
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EMK11303 – ELECTRONICS 1
a)
the peak output voltage
b)
V(sec) = n V(pri)
peak inverse voltage.
PIV = Vp(sec)
V(sec) = 2 x 100V
= 200V
V(sec) = 200V
Vp(out) = Vp(sec) – 0.7V
Vp(out) = 200V – 0.7V
Vp(out) = 199.3V
3. For Fig. 3, determine:
a) the voltage waveform for each half of secondary winding
b) voltage across RL
c) PIV
2: 1
+120V
Vin
-120V
12 kΩ
Fig. 3
a) the voltage waveform for each half of secondary winding
30V
Vp(sec)
2
0
-30V
By: DR LIEW HUI FANG
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EMK11303 – ELECTRONICS 1
b)
voltage across RL
29.3V
Vout
0
c)
PIV
PIV = 2Vp(out) + 0.7V
= (2 x 29.3V) + 0.7V
= 59.3V
6.
Fig. 4 shows the full-wave rectifier (practical model) with the transformer have a 10Vrms
secondary voltage.
a) Sketch Vsec
b) Sketch Vp(out)
c) What PIV rating required for each diode?
100 V
10 kΩ
Fig. 4
Fig. 4 shows the full-wave rectifier (practical model) with the transformer have a 10Vrms secondary
voltage.
a)
Sketch Vsec
Vp(sec) = 1.414Vrms = 1.414 x 10V = 14V
By: DR LIEW HUI FANG
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EMK11303 – ELECTRONICS 1
14V
Vp(sec)
b)
0
Sketch Vp(out)
Vp(out) = Vp(sec) -1.4V = 12.6V
12.6V
Vp(out)
0
c)
What PIV rating required for each diode?
PIV = Vp(out) + 0.7V = 12.6V + 0.7V = 13.3V
7.
A certain full wave rectifier has a peak output voltage of 50V, 120 Hz with capacitor filter
input = 70µF, R-700Ω , Calculate:
a) peak to peak ripple and
b) DC output voltage across 700Ω load resistance.
a)
peak to peak ripple
Vp(out) = Vp(rect) = 50V
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EMK11303 – ELECTRONICS 1
45.7483V
2x120x700x70u
8.
Determine the output voltage waveform for the diode limiter in Fig. 5 below:
+12V
-12V
Fig. 5
9.
Sketch the output voltage waveform as shown in the circuit combining a positive limiter
with negative limiter in Fig. 6 below:
Fig. 6
By: DR LIEW HUI FANG
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EMK11303 – ELECTRONICS 1
By: DR LIEW HUI FANG
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