ETO ETO Exam papers 📅 Aug 2021

Exam Question

(a) Describe the working of a single phase full-wave rectifier with a resistive load. Draw the load voltage and current waveforms (8)

(b) Diode half-wave rectifier supply a resistive load of 100ohms from a 100V ac r.m.s voltage source. The diode is a resistance of 5ohms during conduction state. Calculate (8)

(i) The DC output voltage

(ii) DC average load current

Reference Answer

Single-Phase Full-Wave Rectifier
Differing from the half-wave rectifier, the full-wave rectifier allows the input AC source to complete its current flow circuit in both positive & negative half of an AC cycle.
There are 4 diodes in the full-wave rectifier circuit. When the AC source voltage is positive, the current flows through D1 to the load & back to the AC source via D2. When the AC source voltage is negative, the current flows through D3 to the load and back to the AC source via D4. Either way, the current always goes across the load from the positive to the negative pole.
Figure below shows the waveforms of the input and output voltage of the full-wave rectifier. It can be considered as if rectifier flips the negative voltage to the positive side.

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