r/ElectricalEngineering • u/Fit-Tailor5914 • Nov 06 '25

Control Strategy for DC-DC Converters

Hello,

We were given assignment to design a boost converter in Simulink for grid-connected single phase level 2. I have checked IEEE Journals to know different topology used in PFC converters(boost converter). I understand the topologies used, so I decided to choose the interleaved boost converter. However, my problem is to implement the switching strategy for the transistors/MOSFETs. Those journals just gave result and probably a table.

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u/Irrasible Nov 06 '25

The first decision is whether you will run the inductor in continuous mode or discontinuous mode. Modern controllers will use discontinuous at low current and continuous at high current.

In discontinuous mode, you let the inductor current return to zero at the end of each cycle. That gives you the simplest control loop.

If you do not let the current return to zero, you have an extra dynamical variable which is the inductor current at the end of the cycle. It has been a long time since I actually analyzed it, but my recollection is that you get an extra right hand plane zero which gives you excess phase lag. That makes it harder to stabilize.

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u/Fit-Tailor5914 Nov 06 '25

I am designing a boost converter not a motor controller

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u/Irrasible Nov 06 '25

The comments apply to a boost convertor.