Split supply Single phase uncontrolled full wave rectifier supplying a Capacitive Load- Circuit Diagram &Waveforms
Split supply Single phase uncontrolled full wave rectifier with Capacitive Load:
- The single phase full wave rectifier still does not offer a smooth dc voltage. With resistive load, considerable ripple current will flow into the load. This problem can be solved by connecting a capacitor across the load resistance just as in the case of a half wave rectifier.
- If the capacitor was initially discharged, the diode D1 is forward biased when the switch S is turned on at ωt = 0. The diode D2 remains reverse biased. The output voltage follows the input voltage. D1 carries both the capacitor charging current and the load current.
- At ωt = β the sum of these two currents becomes zero and tends to grow in the negative direction. At this point the diode D1 becomes reverse biased and disconnects the load along with the capacitor from the supply. The capacitor then discharges through the load until at ωt = π φ, v2 becomes greater than v0 and forward biases D2. D1 now remains reverse biased. D2 conducts up to ωt = π β. The same process repeats thereafter.
- We have