Multi-phase EMI noise separator for power electronics
This technology is a circuit device that cleanly separates two distinct types of electrical noise—common mode (CM) and differential mode (DM)—from multi-phase power systems such as inverters and motor drives. It uses specially wound inductors connected across three or more power phases, configured so that each noise type passes through its designated path with almost no signal loss while blocking the other type entirely. This separation is important for diagnosing and filtering EMI problems in power electronics. The device works passively and in parallel, meaning it does not disrupt the system under test while measurements or filtering are being performed.
What you could build
A bench-top or embedded diagnostic module for power electronics engineers testing three-phase inverters, motor drives, or EV charging systems for EMI compliance; buyers would be power electronics OEMs, EMC test labs, and automotive/industrial drive manufacturers.
Who in Virginia should care
Defense contractors and shipbuilders in the Hampton Roads area working on power electronics and EMI compliance for naval systems, plus data center power infrastructure companies in Northern Virginia.
Readiness: Lab validated
Concept — described but not yet demonstrated. Lab validated — supported by experimental results in the patent. Prototype likely — the text describes a built, working embodiment.
Readiness is inferred from the patent text, not from a lab visit.
The record
- Inventors
- Shuo Wang, Fred C. Lee
- Granted
- April 15, 2014
- Status
- Granted patent
- Patent number
- 8698579
Ready to talk?
Virginia Tech Intellectual Properties handles licensing for this technology.
Prosim summaries are generated from public patent text and are not legal advice.