How to build a power electronics curriculum around hardware in the loop

Key Takeaways

• One hardware in the loop bench can support a full power electronics curriculum when every lab builds on the same control chain.
• Course sequencing should follow loop complexity so students prove stable behaviour before moving to physical hardware.
• Assessment should reward safe tuning choices, clear diagnosis, and justified control changes under limited lab time.

A power electronics curriculum built around one hardware-in-the-loop bench will teach control, safety, and tuning more effectively than a sequence that keeps modelling, lab work, and risk management apart.

Employment for electrical and electronics engineers is projected to grow 9% from 2023 to 2033 in the United States, which puts pressure on departments to teach converter control in ways that match lab practice rather than exam habits. Students won’t build confidence from equations alone, because power electronics always ties math to timing, switching, sensing, and protection. A course should mirror that fact from the first week. When one bench becomes the common thread, every topic stays connected to an observable effect.

The main curriculum choice is not which converter to start with. The important choice is where students will test their understanding. A bench-centred structure keeps modelling honest, makes safety visible, and gives you a practical way to run a full semester without waiting until the last lab to touch hardware. That is what turns an engineering curriculum from informative to usable.

A single HIL bench can anchor the full course

A single hardware in the loop bench is enough to anchor a full power electronics course when you use it as the common testing ground for every concept. Students should meet the same plant, controller, sensors, and protection logic across the term. That continuity builds stronger judgment than a course that shifts tools and setups every few weeks.

A simple course path makes the point. Students can start with a direct current converter model, observe steady-state duty cycle effects, move into pulse width modulation, then close a current loop on the same bench. Later, they can add a voltage loop, tune response, and inspect fault behaviour without rebuilding the entire lab setup. The bench becomes a stable reference, so each new concept feels like a meaningful extension rather than a fresh start.

You also gain operational control. Teaching assistants spend less time resetting unfamiliar equipment, and students spend more time linking waveforms to control choices. That matters because the hard part of power electronics isn’t memorizing topologies. The hard part is seeing how small parameter changes alter current ripple, switching stress, and control stability in minutes that still fit a class period.

“A single hardware in the loop bench is enough to anchor a full power electronics course when you use it as the common testing ground for every concept.”

Sequence learning outcomes around converter control loop complexity

Learning outcomes should follow the rising complexity of the control loop, because that is how students actually build usable skill. Start with open-loop converter behaviour, then add timing, sensing, regulation, and fault response in a strict order. Each step should prove that students can predict what the next layer will do before they touch it.

A buck converter is enough for much of this sequence. You don’t need several topologies to teach control progression if the learning outcome is loop design rather than catalogue coverage. That choice keeps cognitive load in check, and it stops the course from becoming a parade of disconnected schematics. Once students can defend their tuning on one familiar plant, they will adapt faster to a bridge or inverter later.

Each lab should connect models to gate signal behaviour

Every lab should force a direct link between the model on screen and the gate signal behaviour that actuates the converter. Students need to see how a control variable becomes switching action, dead time, current ripple, and thermal stress. That link is where abstract control theory becomes engineering practice.

A common miss happens when students tune a controller but never inspect the pulse pattern it creates. A duty cycle command that looks tidy in a plot can still produce poor switching behaviour if sampling, scaling, or saturation is wrong. The better lab asks students to move between plant response, controller output, and gate signal timing during the same exercise. They start to read the system as one chain rather than separate screens.

• Require students to predict the gate pattern before they run the case.
• Make them compare command signals with measured switching action.
• Include one saturation or limit case in every exercise.
• Ask for a brief explanation of ripple and transient behaviour.
• Finish with one controller change and one observed consequence.

That structure will sharpen lab reports as well. Students stop writing vague summaries because each report has to tie a control choice to a waveform and a switching outcome. You’ll also see weaker assumptions sooner. If a student claims stability but the gate signal chatters near a limit, the bench exposes the mismatch immediately.

Safety belongs in every closed loop lab session

Safety should appear in every closed loop session because protection logic is part of the control story, not an administrative add-on. Students need repeated practice with limits, trips, resets, and unstable responses while the stakes are still controlled. That habit builds engineers who recognise unsafe behaviour before hardware forces the lesson.

Active learning raises examination scores by 6% on average across STEM courses, which matters here because students retain safe control habits when they tune a loop and see the consequence during the same class. A lab on integrator windup makes this concrete. Students can push a regulator into saturation, watch the output recover poorly, and then add anti-windup logic and compare the reset behaviour. Safety stops being a warning slide and becomes a design choice they can defend.

You should assess safe response, not only final waveform quality. A student who reaches the target voltage with reckless gain settings has not met the course objective. Good lab design rewards proper sequencing, clear stop conditions, and correct interpretation of fault flags. That is how control and safety stay side by side from the first closed loop exercise onward.

“Safety should appear in every closed-loop session because protection logic is part of the control story, not an administrative add-on.”

Physical converter labs fit after loop stability work

Physical converter labs belong after students have already shown stable loop behaviour on the bench. That order keeps the first hardware session focused on transfer of skill rather than basic troubleshooting. Students arrive ready to compare modelling assumptions with measured hardware behaviour, which is the right intellectual jump at that stage.

A useful handoff uses the same converter students have tuned in simulation. If they stabilised a direct current buck converter on the bench, the physical lab should ask them to commission the hardware version with the same control targets and protection thresholds. They’ll notice dead time effects, sensor offsets, and parasitics quickly because they already know what acceptable response looks like. The hardware session then focuses on interpretation because students already understand the loop structure.

This sequence also protects lab time. Physical rigs introduce wiring checks, instrument setup, and fault risk, so they should add only one new layer of difficulty at once. When students arrive with unstable gains and weak mental models, the session collapses into debugging noise. When they arrive with a stable reference, the hardware teaches nuance instead of confusion.

Prebuilt courseware makes one bench workable across the semester

Prebuilt courseware makes a one-bench course workable because it cuts setup time, standardises experiments, and keeps the focus on learning outcomes. Departments do not struggle with concepts alone. They struggle with limited lab hours, uneven teaching assistant experience, and the overhead of building every exercise from scratch.

The OPAL-RT HIL Starter Kit fits this teaching model because it ships with courseware and pre-built experiments that a department can map across a full semester on one bench. A cohort can rotate through the same platform while still encountering distinct tasks such as open-loop analysis, current regulation, fault response, and controller tuning. That consistency matters more than novelty. Students get repeated exposure to the same signal chain, which is what actually builds fluency.

You also gain cleaner course maintenance. Faculty can adjust rubrics, timing, and fault cases without rebuilding the technical base every term. New instructors step into a structure that already reflects sound sequencing, and labs stay aligned with lectures instead of drifting into separate projects. The course becomes easier to run well, which is often the difference between a strong plan and a sustainable one.

Assessment should measure tuning judgment under constrained lab time

Assessment should measure tuning judgment under lab constraints because that is the skill students will carry into practice. A strong course doesn’t reward the prettiest final trace alone. It rewards how students choose gains, respond to poor behaviour, interpret limits, and justify a safe path to acceptable performance.

A practical rubric will ask students to reach a defined settling target, keep overshoot within a stated bound, explain the gate signal pattern they created, and recover correctly from a triggered protection state. That format values reasoning under time pressure, which is closer to bench work than a polished take-home report. It also gives weaker students a fair way to show competence, because they can earn marks for diagnosis and correction even if the first attempt fails.

Departments that build the course this way will graduate students who treat control, hardware, and safety as one discipline. That is why one bench is enough when the sequence is disciplined and the tasks are cumulative. OPAL-RT fits naturally into that structure because the platform keeps closed loop testing visible, repeatable, and teachable on the same station from the first lab to the last assessment.