Dual converter operating quadrants State whether the following is true or false: “In a dual converter, both converters operate as rectifiers simultaneously.”

Introduction / Context:
A dual converter consists of two controlled bridges connected in anti-parallel across a DC load to provide four-quadrant operation. Correct understanding of their operating roles (rectifier or inverter) is vital for setting firing angles and ensuring smooth current reversal.

Given Data / Assumptions:

• Dual converter with two fully controlled bridges (Converter-1 and Converter-2).
• Four-quadrant DC operation is intended.
• Either circulating-current or non–circulating-current scheme may be used.

Concept / Approach:

At any given time, one bridge functions as a rectifier (delivering power from AC to DC), while the other—if active—must behave as an inverter (returning power from DC to AC) when both are biased. In non–circulating-current mode, only one bridge is gated at a time (rectifier or inverter). In circulating-current mode, both may be biased simultaneously but one will be set to a slightly higher DC voltage and the other slightly lower, creating controlled circulating current; still, both are not acting as rectifiers at the same time.

Step-by-Step Solution:

Verification / Alternative check:

Control strategies always ensure complementary firing angles: alpha_1 + alpha_2 ≈ 180 degrees to set opposite DC polarities in circulating-current systems.

Why Other Options Are Wrong:

Options suggesting conditional truth are incorrect; the bridges cannot both draw power from AC to DC together while connected antiparallel at a common DC bus.

Common Pitfalls:

Assuming 'both on' equals 'both rectifying'; in reality, one must act as an inverter for controlled current circulation or reversal.

Final Answer:

False