McMurray full-bridge inverter Which commutation principle is employed in the McMurray full-bridge inverter topology?

Introduction / Context:
McMurray and McMurray-Bedford inverter families are classic forced-commutated topologies used prior to widespread high-frequency PWM methods. The full-bridge version uses a specific commutation approach that pairs switches in a complementary manner using commutating inductors and capacitors.

Given Data / Assumptions:

• Voltage-source inverter, full-bridge configuration.
• Designed for self-commutation (not reliant on utility zero crossings).
• Commutation network includes coupled inductors and capacitors.

Concept / Approach:

Complementary commutation uses energy exchange between commutating components to transfer current from one device to its complementary partner, turning the outgoing device off while turning the incoming device on. This is distinct from auxiliary commutation (separate auxiliary switch per device) and from natural commutation (line-commutated converters).

Step-by-Step Solution:

Verification / Alternative check:

Canonical diagrams and waveforms in inverter textbooks label the McMurray full-bridge as a complementary-commutated inverter.

Why Other Options Are Wrong:

Auxiliary commutation is associated more with half-bridge McMurray types; natural commutation belongs to line-commutated converters, not self-commutated inverters. “Any of the above” is too vague and incorrect.

Common Pitfalls:

Confusing the McMurray half-bridge (auxiliary) with the full-bridge (complementary); assuming modern PWM methods imply the same commutation principle.

Final Answer:

Complementary commutation