USB PD EPR
240W Lab

USB POWER DELIVERY · EXPLORE & EXPERIMENT

Make sense of charging,
one question at a time.

Learn how USB PD works. Read the conversation. Measure the power.
Start with whatever sparks your curiosity.

What would you like to try?

No prior knowledge or equipment

Understand how USB PD works

From connector shapes to 240W negotiation. Explore three learning floors through everyday questions.

Explore the learning floors
Try the demo without equipment

Read the charging conversation

See how devices agree on power. Start with a demo, then explore your own communication logs.

Open PD-Interpreter
Demo available · KM003C for measurements

Check a charger or cable

Check power capabilities and cable identity. Record real charging and turn the results into a report.

Open PowerChecker
No equipment or installation

Listen to charging as music

Compare two performances, then make your own music from a saved communication log or CSV.

Listen with PD musicus

Getting started with KM003C? Connection & measurement guide →

About USB PD EPR 240W Lab

An independent lab for USB Power Delivery research, measurements, hardware experiments and open-source tools. From everyday charging questions to USB PD 3.1, EPR and 240W protocol analysis.

Explore the research

USB PD 3.1 / EPR

EPR Fixed PDO, AVS, high-voltage operation, negotiation and interoperability.

240W power delivery

Chargers, cables, voltage, current, thermal limits and high-power tests.

Protocol analysis

PD packet capture and decoding, SOP / SOP' and VDM investigations.

Tools & hardware

CY4500 / CY4500-EPR, electronic loads, scripts and custom test fixtures.

For developers · source code

Source code and documentation for the browser tools, plus a command-line tool for CY4500 analyzers.