Voltage reduction due to overlap in a single-phase controlled converter A single-phase controlled converter is fed from a source with series inductance L and supplies a load current I0 (assumed constant). What is the decrease in average output voltage caused by the commutation overlap?

Introduction / Context:
Finite source inductance causes overlap between outgoing and incoming devices during commutation. This overlap reduces the average output voltage, an essential correction for accurate design.

Given Data / Assumptions:

• Single-phase controlled converter (bridge), steady load current I0.
• Source inductance L; overlap angle small, sinusoidal supply.
• Objective is average voltage drop due to overlap.

Concept / Approach:
During overlap, part of the supply voltage is dropped across the source inductance while current transfers, reducing the voltage presented to the DC side. For single-phase bridges the well-known reduction is ΔV = ω L I0.

Step-by-Step Solution:
Inductive drop during overlap ≈ L di/dt; with constant I0 transfer over electrical angle → equivalent average drop equals ω L I0.Hence, Vdc_actual = Vdc_ideal − ω L I0.

Verification / Alternative check:
Detailed derivations integrating instantaneous supply minus inductive drop over the conduction interval yield the same compact correction term for small overlap.

Why Other Options Are Wrong:
Scaled variants (2, π, 1/π): Do not match standard single-phase result.
Zero: Ignores real commutation effects of source inductance.

Common Pitfalls:
Confusing single-phase with three-phase results where coefficients differ; also forgetting that I0 must be essentially constant for this simple form.

Final Answer:
ΔV = ω L I0