Fundamental Of Electronics · Prof. Dr. Fahmy El-khouly. Chapter 2 Diode Applications SERIES DIODE...
Transcript of Fundamental Of Electronics · Prof. Dr. Fahmy El-khouly. Chapter 2 Diode Applications SERIES DIODE...
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Fundamental Of Electronics
Prof. Dr. Fahmy El-khouly
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Chapter 2
Diode Applications
SERIES DIODE CONFIGURATIONS WITH DC INPUTS
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Determine I , V1 , V2 , and Vo for the series dc configuration of Fig. 2.27.
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Determine ID , VD2, and Vo for the circuit
.
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PARALLEL AND SERIES–PARALLEL CONFIGURATIONS
Determine Vo, I1, ID1, and ID2 for the parallel diode configuration
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Determine the voltage Vo for the network
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Determine the currents I1, I2, and ID2 for the network
.
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AND/OR GATES
Determine Vo for the network of Fig. 2.38.
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Determine the output level for the positive logic AND gate of Fig.
2.41.
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SINUSOIDAL INPUTS; HALF-WAVE RECTIFICATION
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(a) Sketch the output Voand determine the dc level of the output for the network
of Fig. 2.48.
(b) Repeat part (a) if the ideal diode is replaced by a silicon diode.
(c) Repeat parts (a) and (b) if V is increased to 200 V and compare solutions
using Eqs. (2.7) and (2.8).m
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FULL-WAVE RECTIFICATION
1-Bridge Network
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Center-Tapped Transformer
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Determine the output waveform for the network of Fig. 2.63 and calculate the
output dc level and the required PIV of each diode.
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PIV is equal to the maximum voltage
across R, which is 5 V
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CLIPPERS
When diode “on” Vo =Vi - Vdc
When diode “off” Vo= 0
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Example 1
*At –ve half cycle diode is “off” then Vo=0
*At +ve half cycle there are two periods:
(i) Vi<Vdc then diode “off” and Vo = 0
(ii) Vi > Vdc then diode “on” and Vo = Vi-Vdc
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Example 2
*At +ve half cycle diode is “on” then Vo=Vi+Vdc
*At -ve half cycle there are two periods:
(i) [Vi]<[Vdc] then diode “on” and Vo = Vi+Vdc
(ii)[ Vi ]> [Vdc] then diode “off” and Vo = 0
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Example 3
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Example 4
When diode is “on” then Vo = Vdc
When diode is “off” then Vo = Vi
At –ve half cycle diode is “on” then Vo = Vdc
At +ve half cycle there are two periods:
(i) Vi<Vdc then diode “on” and Vo = Vdc
(ii) Vi > Vdc then diode “off” and Vo = Vi
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CLAMPERS
After the capacitor charged with Vc=+Vi then the diode is always “off”
and Vo=Vi-Vc
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Example
After the capacitor charged with Vc=+Vi +Vdc
then the diode is always “off”
and Vo=Vi+Vc
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ZENER DIODES
Zener diode equivalents for the (a) “on” and (b) “off” states
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