ECE :: Power Electronics
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If a step down chopper is fed by a dc voltage V with Ton and Toff are on and off periods then
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A voltage VBB is applied across the terminals of a UJT. The emitter voltage at peak point is
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In the circuit of figure, the waveshape of load current when thyristor conducting is
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In the basic series inverter circuit, the source supplies load
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In load commutated chopper, the commutating element
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In a half bridge inverter each thyristor is gated at a frequency f. The output frequency is
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Assertion (A): A transistor has lower voltage drop during conduction as compared to thyristor
Reason (R): Transistors are manufactured in very high voltage and current ratings.
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Assertion (A): Typical value of thermal resistance from source to sink of an SCR is about 0.3° C/W
Reason (R): Heat sinks of thyristors are generally made of aluminium.
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