The portfolio
What I am working on. Projects in converter design, engineering automation and machine learning. Open a project to see how it works and what its results can tell you.
New to AI? Try the first lesson → Published work Engineering work you can read at its original source.
Published Published Work EDN, 26 Aug 2026
My EDN guide to choosing a boost PFC operating mode, starting with what your power supply needs.
Decision Which conduction mode fits the design priorities?
What exists Published by EDN under Rafael Collado's byline.
Limit Apply the guide to your own specifications and component limits.
Read project ↗ Published Published Work Published 6 Apr 2025
A practical map of the eight dependent decisions in an LLC resonant converter design.
Decision Check whether specifications, definitions, selected components, operating range, and stress calculations form one traceable design chain.
What exists A primary EEPower article under Rafael Collado's byline documents the eight-step method; this site adds a review map that preserves its dependencies.
Limit A worked design method is not project-specific design approval or hardware validation.
Read project ↗ Research and prototypes What I am building, what has been tested, and what remains to be done.
Simulation-only research Fault-triage research Research specification
A research workflow that turns simulated flyback evidence into a traceable next simulation check.
Decision Decide which additional simulation check can separate competing explanations, or whether the simulated evidence is too weak to continue.
What exists Defined a simulation-only evidence-to-next-check contract; no hardware diagnostic tool or validated model is claimed.
Limit No hardware measurements, bench validation, safe-measurement guidance, or transfer from simulated cases to physical converters.
Read project ↗ Research Surrogate Models Research
An evaluation contract for deciding when a fast magnetic estimate may be used, warned, escalated, or refused.
Decision Choose use, warn, request higher fidelity, or abstain according to the available evidence.
What exists Defined a public evaluation contract for baselines, grouped validation, residuals, unfamiliar inputs, and abstention.
Limit No trained model, benchmark, public dataset, project-specific threshold, or hardware validation is presented.
Read project ↗ Research Knowledge Systems Prototype specification
A prototype specification for deciding whether approved documentation supports an answer, needs more context, or requires expert review.
Decision Choose answer with citations, ask for missing context, or escalate to expert review.
What exists Specified a three-route answerability workflow and its evaluation plan; no implemented system or accuracy result is claimed.
Limit No public approved-source corpus, benchmark, freshness guarantee, production system, or replacement for expert review is presented.
Read project ↗