Question

By means of a schematic circuit diagram, illustrate the peak rectifier.

If the supply voltage is v(t) =Vm Sin wt, what is the voltage across the load resistor?

The above figure shows a full wave rectifier with a filter arrangement

Diode D1 will conduct in +ve half wave cycle, D2 in –ve half wave cycle

So the current through load will be in same direction but pulsating or ripple are high with fluctuating D.C.

Thus we introduce filter to reduce these variation in voltage.

The filter arrangement has capacitance C1 across the rectifier, coil L in series and capacitor C2 across the load.

The filtering action i.e. mentioned as follow

Filter capacitor C1 – offers low reactance to AC component of rectifier O/P, while it offer infinite reactance to DC component

Therefore C1 bypasses an appreciable amount of AC component while DC component continue its way to L.

Choke L – offer high reactance to AC component while almost o reactance to DC components there fore it allows DC parts to flow through while blocking AC component

Filter capacitor C2 – bypasses the AC component which the choke has failed to block.

Therefore only DC component appear across the load and this is desirable.

If supply voltage is V = Vm Sin wt

The O/P will be Vo – Vrmc = Vm / √2