Monday 13 February 2012

OPERATION OF BRIDGE RECTIFIER

CURRENT FLOW IN THE BRIDGE RECTIFIER
     For both positive and negative swings of the transformer, there is a forward path through the diode bridge. Both conduction paths cause current to flow in the same direction through the load resistor, accomplishing full-wave rectification.
While one set of diodes is forward biased, the other set is reverse biased and effectively eliminated from the circuit.

CONCLUSION
- Rectifiers also find a use in detection of amplitude modulated radio signals. The signal may be amplified before detection, but if un-amplified, a very low voltage drop diode must be used. When using a rectifier for demodulation the capacitor and load resistance must be carefully matched. Too low a capacitance will result in the high frequency carrier passing to the output and too high will result in the capacitor just charging and staying charged.



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