McMurray–Bedford full-bridge inverter Identify the commutation method primarily associated with the McMurray–Bedford full-bridge inverter topology.

Introduction / Context:
Classical thyristor inverters employ forced commutation techniques to turn devices off. The McMurray and McMurray–Bedford families use specific capacitor/inductor arrangements to commutate one device using the complementary device or leg, reducing component stress and improving switching behavior for bridge topologies.

Given Data / Assumptions:

• Full-bridge SCR inverter topology.
• No external line for natural commutation (i.e., stand-alone inverter).
• Named McMurray–Bedford method.

Concept / Approach:

Complementary commutation denotes schemes in which the turning-on of one device (or leg) assists in commutating its complementary device (or the opposite leg) off via resonant transfer using commutation capacitors. This is the hallmark of the McMurray–Bedford approach, distinct from generic “auxiliary commutation” that may use separate auxiliary switches without complementary leg interaction.

Step-by-Step Solution:

Verification / Alternative check:

Topology descriptions and timing diagrams show commutation capacitors linked across opposite devices; the conduction of one leg reverses voltage across the other, forcing current to zero.

Why Other Options Are Wrong:

• Natural commutation requires an AC grid; not applicable.
• “Auxiliary commutation” is too broad and does not capture the complementary leg action specific to McMurray–Bedford.
• “Any of the above” is incorrect because the topology uses a particular method.

Common Pitfalls:

Confusing broad categories (auxiliary, resonant) with the specific complementary scheme; overlooking that “McMurray–Bedford” is a well-known named method.

Final Answer:

complementary commutation