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Switching Power Supplies A - Z, 2nd Edition by Sanjaya Maniktala

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Chapter 14

The Front End of AC–DC Power Supplies

This deals with the tricky front-end design of AC-DC power supplies, both with and without power factor correction. The universal input flyback serves as an example of the latter. Detailed derivations and plots are included to pick the right capacitance per watt (uF/W) for meeting a given holdup time. It is also shown how this impacts the RMS current stress in the input bulk capacitor and the flyback transformer design. In the next part, active power factor correction using a boost converter is discussed in great detail, starting from the slow transformation of a standard fixed input voltage and fixed output current DC-DC boost converter. All the equations for RMS current stresses are thus derived ...

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