Design of zero-voltage-ripple buck dc-dc converter

This paper presents the design of a zero-voltage-ripple (ZVR) buck dc-dc converter. The circuit uses an autotransformer for ripple cancellation in the output voltage. The principle of operation is discussed in brief. The relationship between the currents through the magnetizing inductance and the auto-transformer windings is developed. The auxiliary inductance for ripple cancellation in series with the secondary winding is determined. The expression for the auxiliary inductance is derived. A laboratory prototype of a buck converter with supply voltage 12 V, output voltage voltage 5 V, switching frequency 500 kHz, and output power 10 W was built. Simulation and experimental results are provided validating the theoretical predictions.

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