Split supply Single Phase Uncontrolled Full wave rectifier supplying R-L Load - Circuit Diagram & Waveforms
Split supply single phase uncontrolled full wave rectifier with R-L load:
- The split power supply can be considered to have been obtained from the secondary of a center tapped ideal transformer (i.e. no internal impedance).
- When the switch is closed at the positive going zero crossing of v1 the diode D1 is forward biased and the load is connected to v1. The currents i0 and ii1 start rising through D1. When v1 reaches its negative going zero crossing both i0 and ii1 are positive which keeps D1 in conduction. Therefore, the voltage across D2 is VCB=V1- V2.
- Beyond the negative going zero crossing of vi , D2 becomes forward biased and the current i0 commutates to D2 from D1. The load voltage v0 becomes equal to v2 and D1 starts blocking the voltage VAB=V1-V2. The current i0 however continues to increase through D2 till it reaches the steady state level after several cycles.
- Steady state waveforms of the variables are shown in Fig 9.6 (b) from ωt = 0 onwards. It should be noted that the current i0, once started, always remains positive.
- This mode of operation of the rectifier is called the “Continuous conduction mode” of operation. This should be compared with the i0 waveform of Fig (b) for the half wave rectifier where i0 remains zero for some duration of the input supply waveform. This mode is called the “discontinuous conduction mode” of operation.
- We have,
- From this we know that both the form factor and the ripple factor shows considerable improvement over their half wave counter parts.