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1. BRIDGE RECTIFIER Name : ch abhinay Roll.no : 22r21a05L6 Branch : cse -D

2. What is BRIDGE RECTIFIER ? The bridge rectifier is a type of full-wave rectifier that uses four or more diodes in a bridge circuit configuration to convert alternating (AC) current to a direct (DC) current.

3. CIRCUIT :

4. It is basically a full wave rectifier , but it does not need a center tapped transformer.It has four diodes D1,D2,D3 & D4 connected as a bridge. The AC voltage to be rectified is applied to the primary winding of the transformer . During positive half cycle the diodes D1 & D3 are forward biased whereas D2 & D4 are reverse biased . Hence D1 and D3 will conduct and current flows through the load resistor. During negative half cycle the diodes D2 & D4 are forward biased whereas D1 & D3 are reverse biased . Hence D2 and D4 will conduct and current flows through the load resistor. OPERATION :

5. PARAMETERS : Average output current : 2Im/pi RMS output current : Im /root2 Efficiency : 81.02% Ripple factor : 0.48 Peak inverse vo ltage : Vm TUF : 0.812 Pac = Vm^2/2RL Pdc = 4Vm^2/pi ^2RL

6. ADVANTAGES : The efficiency of the bridge rectifier is higher than the efficiency of half wave rectifier. The DC output signal of the bridge rectifier is smoother than the output DC signal of a half wave rectifier. It has less ripple factor value The circuit complexity is more , the voltage regulations are good and the voltage across the diode is high .

7. APPLICATIONS : For supplying polarized and steady DC voltage in welding . Inside power supplies. Inside battery chargers. Inside wind turbines. To detect the amplitude of modulating signals.

8. REAL TIME APPLICATION : These welding rectifiers are also used as an alternative to DC welding generators and even have an edge over DC welding generator as there are no moving parts in welding rectifier except the cooling fan which ensures almost nil maintenance cost, besides its low initial cost as compared to generator.