Mathematical Exercise of Full wave rectifier Special purpose Diode Zener Diode Mathematical exercise of Zener Diode Full Wave Rectifier Circuit Details Full wave Rectifier ID: 790444
Download The PPT/PDF document "Lecture – 4 Full wave rectifier" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Lecture – 4
Full wave rectifier
Mathematical Exercise of Full wave rectifier.
Special purpose Diode (
Zener
Diode )
Mathematical exercise of
Zener
Diode.
Slide2Full-
Wave
Rectifier ( Circuit Details )
Slide3Full
wave Rectifier (
cont. )
Slide4Full-Wave R
ectifier (Cont.)
Advantages:
(
i
) The need for centre-tapped transformer is eliminated
. (ii) The output is twice that of the centre-tap circuit for the same secondary voltage. (iii) The PIV is one-half that of the centre-tap circuit (for same d.c. output).
Disadvantages:
(
i
) It requires four diodes
.
(
ii) As during each half-cycle of
a.c
. input two diodes that conduct are in series,
therefore,
voltage
drop in the internal resistance of the rectifying unit will be twice as great as in the centre
tap circuit
. This is objectionable when secondary voltage is small.
Slide5Question : A
full-wave rectifier uses two diodes, the internal resistance of each diode
may
be
assumed constant at
20
Ω
. The transformer r.m.s. secondary voltage from centre tap to each end of secondary is 50 V and load resistance is 980 Ω. Find : (i) the mean load current (ii) the r.m.s. value of load current
Slide6Special P
urpose
Diode (
Zener
Diode )
Definition:
A
properly doped crystal diode which has a sharp breakdown voltage is known as a zener diode.
Slide7Zener Diode ( Cont. )
Characteristics of
Z
ener
Diode:
(
i) A zener diode is like an ordinary diode except that it is properly doped so as to have a sharp breakdown voltage.
(
ii) A
zener
diode is always reverse
connected i.e
. it is always reverse biased.
(
iii) A
zener
diode has sharp breakdown
voltage,
called
zener
voltage
Vz
.
Slide8Question:
For
the circuit shown in
Fig .(
i
), find :
(i) the output voltage (ii) the voltage drop across series resistance (iii) the current through zener diode.
Slide9Thank You