Chopper commutation using a saturable reactor Which chopper circuit classically employs a saturable reactor for commutation?

Introduction / Context:
Different chopper commutation schemes use various reactive elements and auxiliary switches. Recognizing hallmark components (like saturable reactors) helps identify the chopper type quickly in exams and practice.

Given Data / Assumptions:

• Focus is on classical named chopper topologies.
• Device technology is thyristor-based (historical context).

Concept / Approach:

The Morgan chopper employs a saturable reactor (magnetic switch) and a commutating capacitor to achieve turn-off of the main thyristor by generating a reverse current/voltage. Jones chopper, by contrast, uses a resonant LC and an auxiliary thyristor without the saturable-core element. Load-commutated schemes depend on the load EMF for commutation, not a saturable element.

Step-by-Step Solution:

Verification / Alternative check:

Topology diagrams in textbooks label the saturable reactor explicitly in Morgan circuits.

Why Other Options Are Wrong:

Auxiliary and Jones choppers rely on LC resonance and auxiliary SCR, not saturable cores; load commutated depends on the load.

Common Pitfalls:

Confusing Morgan with magnetic amplifier concepts or assuming all auxiliary-commutated choppers use saturable reactors.

Final Answer:

Morgan chopper