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Lecture – 4 Full wave rectifier Lecture – 4 Full wave rectifier

Lecture – 4 Full wave rectifier - PowerPoint Presentation

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Lecture – 4 Full wave rectifier - PPT Presentation

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

voltage diode full zener diode voltage zener full wave circuit rectifier centre secondary resistance tap sharp iii breakdown diodes

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Presentation Transcript

Slide1

Lecture – 4

Full wave rectifier

Mathematical Exercise of Full wave rectifier.

Special purpose Diode (

Zener

Diode )

Mathematical exercise of

Zener

Diode.

Slide2

Full-

Wave

Rectifier ( Circuit Details )

Slide3

Full

wave Rectifier (

cont. )

Slide4

Full-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.

Slide5

Question : A

full-wave rectifier uses two diodes, the internal resistance of each diode

may

be

assumed constant at

20

. 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

Slide6

Special P

urpose

Diode (

Zener

Diode )

Definition:

A

properly doped crystal diode which has a sharp breakdown voltage is known as a zener diode.

Slide7

Zener 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

.

Slide8

Question:

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.

Slide9

Thank You