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In current commutation, in chopper circuit we use _____________

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In current commutation, in chopper circuit we use _____________

(a) 2 auxiliary thyristors

(b) 2 diodes

(c) 1 auxiliary thyristor

(d) 2 auxiliary thyristors and 2 diodes

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My doubt stems from DC Motor Control Through Choppers in section Motor Control by Static Power Converters of DC Machines

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Correct choice is (d) 2 auxiliary thyristors and 2 diodes

Explanation: Two auxiliary thyristors are connected in the chopper circuit along with two diodes, one inductor, one capacitor in series with the voltage supply which is then connected in parallel with diode and DC motor armature.

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