Single phase uncontrolled half wave rectifier with resistive Load - Circuit Diagram & Waveforms
1Φ uncontrolled Half wave rectifier with R Load Circuit Diagram & Waveforms:
- Figure shows the circuit diagram and the waveforms of a single phase uncontrolled half wave rectifier. If the switch S is closed at at t = 0, the diode D becomes forward biased in the the interval 0 < ωt ≤ π.
- If the diode is assumed to be ideal then
v0 = vi = √2 Vi sin ωt
vD = vi – v0 = 0
Since the load is resistive,
- For ωt > π, vi becomes negative and D becomes reverse biased. So in the interval π < ωt ≤ 2π,
ii = i0 = 0
v0 = i0R =0
vD = vi – v0 = vi = √2 Vi sinωt
- From these relationships,
- It is evident from the waveforms of v0 and i0that they contain significant amount of harmonics in addition to the dc component. Ripple factor of v0 is given by
- With a resistive load ripple factor of i0 will also be same. Because of such high ripple content in the output voltage and current this rectifier is seldom used with a pure resistive load.