VTU Notes | 18EC36 | POWER ELECTRONICS & INSTRUMENTATION

VTU Module-3 | Switched Mode Power Supplies

Module-3

4.9
2018 Scheme | ECE Department

Created by VtuNotes.in
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5 Modules

18EC36 | POWER ELECTRONICS & INSTRUMENTATION | Module-3 VTU Notes

Summary:

Switched Mode Power Supplies (SMPS) are essential electronic devices used to convert electrical energy efficiently from one form to another, commonly from AC to DC voltage levels. Within the realm of SMPS, two prominent concepts are the Isolated Flyback Converter and the Isolated Forward Converter.

1. Isolated Flyback Converter:

The Isolated Flyback Converter is a widely used topology in SMPS design. It provides electrical isolation between input and output, making it suitable for applications that require safety and protection against electrical hazards. This converter operates on the principle of energy storage and transfer. During the ON period of the switching transistor, energy is stored in the primary winding of the transformer. When the transistor switches OFF, the energy is transferred to the secondary winding, and the output voltage is rectified and filtered to obtain the desired DC voltage. The key advantages of the Isolated Flyback Converter include simplicity, low component count, and cost-effectiveness.

2. Isolated Forward Converter:

The Isolated Forward Converter is another important SMPS topology. It also provides electrical isolation and is commonly used in medium-to-high-power applications. Unlike the Flyback Converter, the Forward Converter operates on the principle of energy transfer without energy storage. The transformer core is reset to its initial state during each switching cycle, resulting in reduced core size and losses. This design allows for higher power density and efficiency. The Isolated Forward Converter is suitable for applications requiring greater power levels, such as industrial equipment and power distribution systems.

In summary, the concepts of Isolated Flyback Converter and Isolated Forward Converter are fundamental in the field of Switched Mode Power Supplies. Designers choose between these topologies based on factors like power requirements, cost, efficiency, and desired features such as electrical isolation. Understanding these concepts is crucial for engineers and researchers working in power electronics and related fields.

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