BRIDGE RECTIFER

**: - To calculate the ripple factor of a bridge rectifier, with and without filters.**

__AIM__**:-**

__APPARATUS__ Experimental board

Diodes, IN4007 ---- 4 Nos.

Resistor, 1KΩ

Capacitor, 100μF/25v.

Transformer (6-0-6v)

Multi meters –2 No

Connecting Wires

**:-**

__CIRCUIT DIAGRAM__

__THEORY:__**-**

The bridge rectifier is also a full-wave rectifier in which four p-n diodes are connected in the form of a bridge fashion. The Bridge rectifier has high efficiency when compared to half-wave rectifier. During every half cycle of the input, only two diodes will be conducting while other two diodes are in reverse bias.

__PROCEDURE__:-1. Connections are made as per the circuit diagram.

2. Connect the ac main to the primary side of the transformer and secondary side to the bridge rectifier.

3. Measure the ac voltage at the input of the rectifier using the multi meter.

4. Measure both the ac and dc voltages at the output of the Bridge rectifier.

5. Find the theoretical value of dc voltage by using the formula,

**:-**

__CALCULATIONS__**Theoretical calculations**:-

Vrms = Vm/ √2

Vm =Vrms√2

Vdc=2Vm/П

(

**i)Without filter**: Ripple factor, r = √ ( Vrms/ Vdc )

^{2 }-1 = 0.482**(ii)With filter**:

**Ripple factor, r = 1/ (4√3 f C R**

_{L}) where f =50Hz

C =100µF

**R**

_{L}=1KΩ

**Practical Calculations:-**

**Without filter**:-

Vac=

Vdc=

Ripple factor, r=Vac/Vdc

**With filters**:-

Vac=

Vdc=

Ripple factor,r=Vac/Vdc

__OBSEVATIONS:-__**Without Filter**

USING DMM | V_{ac}(v) | V_{dc}(v) | r= V/_{ac} V_{dc} |

| | |

**With Filter**

USING DMM | V_{ac}(v) | V_{dc}(v) | r= V/_{ac} V_{dc} |

| | |

**Without Filter:-**

Vrms = Vm/ √2 , Vdc=2Vm/П , Vac=√( Vrms

^{2}- Vdc^{2})

USING CRO | V_{m}(v) | V_{ac}(v) | V_{dc}(v) | r= V/_{ac} V_{dc} |

| | | |

**WITHFILTER**

USINGCRO | V_{1}(V) | V_{2}(V) | V_{dc}= (V_{1}+V_{2})/2 | V_{ac}=(V_{1- }V_{2})/2√3 | r= V/_{ac} V_{dc} |

| | | | |

__MODELWAVEFORM__**:-**

__PRECAUTIONS__**:-**

1. The voltage applied should not exceed in the ratings of the diode

2. The diodes will be connected correctly

__RESULT:__**-**

The Ripple factor of Bridge rectifier is with and without filter calculated.

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