Junction Diode as Rectifier :
Principle. A rectifier is a device, which converts alternating current and voltage into direct-current and voltage. It makes use of the fact that p-n junction conducts when forward biased and does not conduct when reverse biased (i.e. unidirectional characteristic)
It has two types :
(i) Half-wave rectifier
(ii) Full-wave rectifier
Half-wave rectifier :
Working. The applied alternating voltage and half-wave rectified current are shown in figure.
Result. Voltage developed by the half-wave rectified current across the load resistance (RL) is too much fluctuating and hence serves no useful purpose.
Full-wave rectifier :
Two junction diodes – Full-wave rectifier :
Working. The applied voltage and full-wave rectified current are shown in figure (c) Result. Voltage drop across load resistance (R1) is less fluctuating. It is made smooth by using filter circuits consisting of chokes and capacitors.
Full-wave rectified current (electron current)
Ripple & Ripple factor
A.C. components are present in Rectifier output these are known as ripple & they are measured in a factor which is ripple factor.
Also Read :
|→ Energy Levels & Energy Bands
→ Intrinsic semiconductor & Extrinsic Semiconductor
→ P-N Junction & P-N Junction Diode
→ Zener diode
→ Junction Triode (Transistor)
→ Transistor as Amplifier