What are the similarities and differences between a diode and a silicon controlled rectifier? You may offer illustrations to support the answer.

Under controlled conditions a diode's current is modelled by the equation : Question 1 I, = I,(exp(kV)–1) where Io is the diode current, V the 'forward biased diode voltage, Is is the reverse leakage current and k is a diode specific constant. a) For the diode characteristics shown in Figure Qla determine its model constants Is and k. Diode Current ima) 2uA -0.2 0.1 0.1 02 0.4 Diode Voltage (V) 0.5 0.6 0.7 0.8 0.9 Figure Qla: Diode Characteristics

> A three-phase, half-wave uncontrolled rectifier is fed from an ideal three-phase voltage 50 Hz. The load is resistive with R=15 Q. Calculate: (a) The average output voltage and average load current of the rectifier. (b) The d.c. and a.c. power dissipations in the load. ae (c) The diode ratings. (d) What is the lowest ripple frequency of the output voltage waveform?

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