The type-C chopper or two quadrant type-A chopper has______.

Question

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Option B: Type-A and type-B choppers in parallel

Explanation & Concepts:
A Type-C chopper is a combination of Type-A and Type-B choppers connected in parallel, allowing for two-quadrant operation. It permits current to flow in both directions (forward and reverse) while maintaining a positive voltage, enabling both motoring and regenerative braking.

Working Principle: The Type-C chopper consists of two switches ($CH_1$ and $CH_2$) and two diodes. When $CH_1$ is ON, the load voltage is positive and current flows from source to load (Type-A operation). When $CH_2$ is ON, the energy stored in the load inductance is returned to the source (Type-B operation), allowing for current reversal.

Key Formulas: $V_o = V_s$ (during Type-A); $V_o = 0$ (during Type-B)

Key Points: Operates in the first and second quadrants.; The output voltage is always positive.; The load current can be either positive or negative.; Used in DC motor drives for regenerative braking.

Advantages: Supports bidirectional current flow; Enables regenerative braking

Disadvantages: Requires complex control circuitry; Not capable of negative output voltage

Applications: DC traction systems; Electric vehicle motor controllers

Additional Info: Type-A is a step-down chopper (First Quadrant).. Type-B is a step-up chopper (Second Quadrant).. Combining them in parallel creates a Type-C two-quadrant configuration.

Answer: B is correct — The Type-C chopper is formed by connecting a Type-A (Class-A) and a Type-B (Class-B) chopper in parallel to achieve two-quadrant operation.

Exam Tip: Remember that Class-C is parallel, while Class-D is series combination of choppers for different quadrant operations.

Examoogle · Answer

Option A: Type-A and type-B choppers in series

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Option C: Two type-A choppers in series

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Option D: Two type-A choppers in parallel

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