Modified series inverter (two inductors and two capacitors) How many parallel current paths exist for the load current in this topology?

Introduction / Context:
The modified series inverter (e.g., McMurray/McMurray-Bedford variants) uses split capacitors and inductors to realize efficient commutation and improved control of current. Recognizing the number of parallel paths for load current helps in understanding commutation intervals, current sharing, and device stress.

Given Data / Assumptions:

• Two inductors and two capacitors are included as commutating elements.
• H-type arrangement with series resonance used for device turn-off.
• Load current is continuous or quasi-continuous due to resonant paths.

Concept / Approach:

The split L–C network provides alternative current routes during commutation. When one device pair conducts, a resonant path through one L–C branch develops to aid in turning off the conducting device and transferring current. Thus, the load current can flow through either of two parallel resonant paths depending on the switching state.

Step-by-Step Solution:

Verification / Alternative check:

Standard circuit diagrams show two L–C branches arranged so that each half-cycle has its own resonant commutation path, confirming two effective parallels for current.

Why Other Options Are Wrong:

One path ignores the commutation branch; three or four paths overstate the available distinct resonant routes in the canonical two-L, two-C configuration.

Common Pitfalls:

Confusing conduction paths of switching devices with unique current paths through the resonant network; overlooking the role of the auxiliary branch during commutation.

Final Answer:

Two parallel paths