Q3. (a) () Draw the circuit diagram for a single phase half-wave thyristor rectifier circuit with a resistive load [3] (

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Q3 A Draw The Circuit Diagram For A Single Phase Half Wave Thyristor Rectifier Circuit With A Resistive Load 3 1 (51.3 KiB) Viewed 32 times

Q3. (a) () Draw the circuit diagram for a single phase half-wave thyristor rectifier circuit with a resistive load [3] (i) For the circuit in (i), sketch waveforms for load voltage, load current and thyristor voltage for firing angle a-60*, 240V a.c. supply and 600 resistive load. [6] (iii) Using your output voltage waveform in (a)(ii), calculate the mean output voltage at Q-60'. 141 (b) The circuit in (a) is now supplying a heavily inductive load drawing 15A from the 240V a.c. supply. Assuming level current, commutating diode is used and neglecting thyristor and diode voltage drops, calculate: (1) Peak reverse voltage and maximum rms current for thyristor. (ii) Peak reverse voltage and maximum rms current for diode. 131 [3] (c) ) Draw the circuit diagram for the power electronics converter that generates the waveforms in Fig. 23. 121 (ii) Draw the voltage and current waveforms when the angle a in Fig. Q3 is a=90° [2] (1) Explain how the circuit in (c)(i) can be controlled to operate in inversion mode. [2] Ty. T2 + T.T On V - Vsin car 0 CE 10 2 W 0 IT + Load current 2 Fig. Q3 Waveforms