How to Design and Simulate a 4-Phase Interleaved Boost Converter Using MATLAB Simulink

In this case study, I investigate the performance of a 4-phase interleaved boost converter using MATLAB Simulink. This type of DC-DC converter architecture is widely used in high-efficiency power systems due to its improved current sharing and reduced output ripple.

Each phase of the converter is symmetrically designed using identical passive components:

Inductors: L₁ = L₂ = L₃ = L₄ = 1.5 mH
Capacitors: C₁ = C₂ = 200 μF

The converter supplies an inductive load that draws a constant output current of 5 A. The input voltage is fixed at 30 V, and the converter is operated at a duty cycle (D) of 0.6.

The primary simulation objectives are to analyze:

The voltage gain of the converter,
The output voltage ripple characteristics,
And the phase current sharing behavior under these operating conditions.

Simulink design of 4-phase interleaved boost converter

Simulink inputs and output of design

Through this design and simulation, the following steady state waveforms can be evaluated:

Load voltage

Load current

Current through inductor 𝐿1

Input current drawn from the 𝑉𝑑 source

Voltage across 𝐶1

Want to explore the Simulink design in detail? Check it out on my GitHub page:

https://github.com/Udaralakshaya/4-Phase-Interleaved-Boost-Converter.git

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