Single phase uncontrolled half wave rectifier with inductive load- Circuit Diagram & Waveforms
Single phase uncontrolled half wave rectifier with inductive load- Circuit Diagram & Waveforms:
- The ripple factor of output current can be reduced to same extent by connecting an inductor in series with the load. As in the Resistive Load case, the diode D is forward biased when the switch S is turned on. at ωt = 0. However, due to the load inductance i0 increases more slowly.
- Eventually at ωt = π, v0 becomes zero again. However, i0 is still positive at this point. Therefore, D continues to conduct beyond ωt = π while the negative supply voltage is supported by the inductor till its current becomes zero at ωt = β.
- Beyond this point, D becomes reverse biased. Both v0 and i0 remains zero till the beginning of the next cycle where upon the same process repeats.It can be shown that β increases with φ.
- V0AV decreases with increasing β while V0RMS increases with β. Therefore, with increasing φ (and hence increasing L) the form factor and the ripple factor of v0 worsens. However, the ripple factor of i0 decreases with increasing L. Therefore, in certain applications, where a smooth dc current is of prime importance (e.g. the field supply of a dc motor) this configuration of the rectifier is preferred.