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fullwave rectifier with and withour filter

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					                                                                   EXPERIMENT NO. 6
FULL WAVE RECTIFIER WITH AND WITHOUT FILTER

AIM:
       To study the full wave rectifier with and without filter to calculate ripple factor and
percentage of regulation.

APPARATUS:
           1. Center tap Transformer (12-0-12)V                   -     1
           2. PN junction Diode (IN4007)                          -     2
            3. Capacitor- 1000 F/ 25V                             -     1
            4. Decade Resister Box                                -     1
            5. CRO                                                -     1
            6. Bread Board                                        -     1
            7. Connecting Wires                                   -     10
            8. Digital multi meter                                -     1
FORMULAE:
                1. Ripple Factor = Vr,rms / Vdc
                2. % Regulation = VNL- VFL/ VFL x 100
THEORY:
           A full wave rectifier is a circuit, which allows a unidirectional
current to flow through the load, during the entire input cycle as shown
in the figure. The result of full wave rectification is a DC output voltage.
They pulsate every half cycle of the input signal. There are two types of
full wave rectifier namely.
1. CENTERTAPPED FULL WAVE RECTIFIER
2. BRIDGE TYPE RECTIFIER
The center tapped full wave rectifier uses two diodes, where are
connected to the centre tapped secondary winding of the transformer
circuit so that the current flows and produce a voltage drop across the
load resister RL. the voltage produce across the load resister has the same
shape as that of the positive input half cycle of AC input voltage as
shown in the figure. The waveform of diode current is also shown in the
figure.
          During the negative half cycle of input voltage, the diode is
reverse biased and hence it does not conduct. Thus there is no current
flow or no voltage drop across the load resister RL. During
The positive half cycle of input voltage, the diode i.e. forward biased
and hence it conducts. The result is that output voltage appears across
the load resister RL. Now it is evident that the output voltage is not a
steady DC. But it is only a pulsating DC wave having ripple factor
frequency equal to the input voltage frequency.
          To smoothen out the voltage ripples or pulsating DC a capacitor
filter is used. This filter blocks AC components and freely passes DC
components.
  PROCEDURE:
           1. Connect the Wires in circuit as shown in the figure
           2. Switch on the supply and note down the reading of DC
           input voltage in secondary of transformer and rectified DC voltage
           without connecting the load resister
           3. Vary the load in convenient steps and note down rectified
           DC&AC voltage
           4. Connect the capacitor filter and repeat the steps 3 for
           different values of load resistance
           5. Calculate the ripple factor and % of regulation from the obtained
           readings
           6. You can draw the input and output waveforms of rectifier (with &
           without filter ) by the using of CRO
            7. Draw the graph between
           a. load resistance and ripple factor by using without filter
           b. load resistance and ripple factor by using with filter

RESULT:
    Thus the full Wave Rectifier has done and the following
    Parameters are calculated.

      1.   Ripple factor Without filter is     =
      2.   Ripple factor With filter is        =
      3.   % of Regulation without filter is   =
      4.   % of Regulation with filter is      =
 WITHOUT FILTER:
                                     VNL (No Load Voltage) =

S.No   Vdc in Volts   Vr,rms in     RL in K    Ripple Factor   % Regulation =
                       Volts                    Vr,rms / Vdc   VNL–VFL / VFL




 WITH FILTER:
                                      VNL (No Load Voltage) =

        Vdc      in Vr,rms        in RL in K    Ripple Factor % Regulation =
S.No    Volts       Volts                       Vr,rms/ Vdc   VNL- VFL/ VFL
CIRCUIT DIAGRAM:-
WITHOUT FILTER:-

                                 1N4007GP
                                            K
                 T1          A
                       12V           D1
   250V                                     +                                           +
AC 50HZ                      0
                                     D2               (0-20V)
                      12V        A          K                                  kΩ
                                                                                        CRO CRO O/P
          CENTER TAPPED                         Vdc             Vac            DRB
                                 1N4007GP
          TRANSFORMER
                                                                                        _




WITH FILTER:-

                                 1N4007GP
                                            K
                 T1          A
                       12V           D1
   250V                                     +                                           +
AC 50HZ                      0
                                     D2               (0-20V)
                      12V        A          K                              + C1               CRO O/P
                                                                Vac
                                                                      100uF_         kΩ CRO
          CENTER TAPPED          1N4007GP       Vdc
                                                                                     DRB
          TRANSFORMER
                                                                                        _
MODAL WAVE FORM




CRO A.C
INPUT
VOLTAGE           T(m sec)




WITH OUT
FILTER -
OUTPUT
VOLTAGE           T(m sec)




 WITH
FILTER
OUTPUT            T(m sec)
VOLTAGE
FULLWAVE RECTIFIER:-
MODALGRAPH:-
WITHFILTER




Ripple                       %
Factor                   Regulation




                   RL (KΩ)            RL (KΩ)

WITHOUT FILTER:-




Ripple                    %
Factor                   Regulation




                       RL (KΩ)        RL (KΩ)

				
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posted:11/9/2011
language:English
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