Full Bridge Rectifie, Bridge Rectifier, Emax, Eavg, Imax, Iavg
Bridge Rectifier
A bridge rectifier makes use of four diodes in a bridge arrangement to achieve full-wave rectification.
This is a widely used configuration, both with individual diodes wired as shown and with single component bridges where the diode bridge is wired internally.
Applications :
The primary application of rectifiers is to derive DC power from an AC supply.
Rectifiers also find a use in detection of amplitude modulated radio signals.
Rectifiers are also used to supply polarized voltage for welding.
Full Bridge Rectifier
A Full Wave Bridge Rectifier is a circuit, which converts an ac voltage into a pulsating dc voltage using both half cycles of the applied ac voltage. It uses two diodes of which one conducts during one half cycle while the other conducts during the other half cycle of the applied ac voltage.
During the positive half cycle of the input voltage, diode D1 becomes forward biased and D2 becomes reverse biased. Hence D1 conducts and D2 remains OFF. The load current flows through D1 and the voltage drop across RL will be equal to the input voltage
During the negative half cycle of the input voltage, diode D1 becomes reverse biased and D2 becomes forward biased. Hence D1 remains OFF and D2 conducts. The load current flows through D2 and the voltage drop across RL will be equal to the input voltage.
As an equation:
Where:
Emax = The peak value of the load voltage pulse
Eavg = 0.637 X Emax (the average load voltage)
Imax = The peak value of the load current pulse
Iavg = 0.637 X Imax (the average load current)
Applications :
The primary application of rectifiers is to derive DC power from an AC supply.
Rectifiers also find a use in detection of amplitude modulated radio signals.
Rectifiers are also used to supply polarised voltage for welding.