Explain full wave rectifier using SCR with resistive and capacitive load.
Answers
Answer:
Full-wave Controlled Center-tap Rectifiers. To build a controlled rectifier or a phase controlled rectifier, the diodes in the rectifier circuits are replaced by SCRs. ... Unlike a diode, an SCR will not automatically conduct when the anode-to-cathode voltage becomes positive a gate pulse must be provided.
Answer:
Rectification converts an oscillating sinusoidal AC voltage source into a constant current DC voltage supply by means of diodes, thyristors, transistors, or converters. This rectifying process can take on many forms with half-wave, full-wave, uncontrolled and fully-controlled rectifiers transforming a single-phase or three-phase supply into a constant DC level. In this tutorial we will look at single-phase rectification and all its forms.
Rectifiers are one of the basic building blocks of AC power conversion with half-wave or full-wave rectification generally performed by semiconductor diodes. Diodes allow alternating currents to flow through them in the forward direction while blocking current flow in the reverse direction creating a fixed DC voltage level making them ideal for rectification.
However, direct current which has been rectified by diodes is not as pure as that obtained from say, a battery source, but has voltage changes in the form of ripples superimposed on it as a result of the alternating supply.
But for single phase rectification to take place, we need an AC sinusoidal waveform of a fixed voltage and frequency as shown.