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The single−phase mid-point type cycloconverter uses __________ number of SCRs.

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Answer & Explanation

Correct AnswerA. 4

Quick Explanation

A single-phase midpoint cycloconverter uses two midpoint full-wave controlled converter groups—one positive and one negative. Each group requires two SCRs, giving a total of four SCRs.

Formula / Key Relation

SCR count = 2 SCRs/group × 2 groups = 4

Detailed Explanation

Concept & Reasoning

Cycloconverters directly convert fixed-frequency AC to lower-frequency AC. For a midpoint topology, the positive converter synthesizes positive load voltage and the negative converter synthesizes negative load voltage. Each converter is a two-pulse controlled midpoint rectifier with two thyristors.

How to Solve It in the Exam

Midpoint single-phase cycloconverter: 2 + 2 = 4 SCRs.

Important Exam Point

Do not use bridge-converter SCR count (4 per bridge) for a midpoint topology.

Related Revision Path

This question sits in the revision path Power Electronics → Cycloconverters → Single-Phase Cycloconverters .

Mid-Point Cycloconverter SCR Count explanatory diagram

Quick Trick

Midpoint single-phase cycloconverter: 2 + 2 = 4 SCRs.

Common Mistake

Answering 8 by assuming two full bridges instead of two midpoint converters.

Exam Tip

Do not use bridge-converter SCR count (4 per bridge) for a midpoint topology.

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Exam Path

Knowledge Path

Study concept · Mid-Point Cycloconverter SCR Count →Practice concept Practice topic

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