#Technical Studies – Study 5
Bridge rectifier is a circuit that uses four diodes in a bridge configuration to produce full wave rectification from AC input signal.
It uses a step down transformer, four diodes, a load resistor and an AC source.
The circuit connection is shown below.
When AC sinusoidal signal is applied
During positive half cycle of the signal D1 and D4 conducts and the load current flows from positive to negative direction.
During negative half cycle diode D3 and D2 conducts and the load current flows from positive to negative direction.
During both half cycles of the input the load current direction is same and the load voltage has the same polarity.
In output signal the negative half cycle of the input signal is shifted to positive side.
The output is same as the full wave rectifier.
As the bridge rectifier output is same as full wave rectifier, the output frequency of the bridge rectifier is same as the output of full wave rectifier.
Dc value of output:
Because the output of bridge rectifier is same as full wave rectifier the dc value is same as full wave rectifier.
Vdc= 0.636 Vp
The ripple factor for bridge rectifier is 0.482.
Bridge rectifier efficiency is 81.2%
Peak inverse voltage:
Peak inverse voltage is vs max.
1.Full secondary voltage of the transformer is used
Circuit is complex
Bridge rectifier with filter:
The output of bridge rectifier contains both AC and DC components. The application needs pure dc. So the rectified output requires further processing. The unwanted AC component can be reduced by adding a filter to the rectifier.
Below circuit shows a bridge rectifier with capacitor filter.
Please write in the comment box below if you have any questions.