Winding capacitance cancellation for high-frequency EMI
This technology solves a longstanding problem in inductor design: at high frequencies, the tiny unintended capacitances that exist between wire turns and between the wire and the core cause inductors to stop working as intended, creating interference and signal degradation. The invention uses a carefully arranged network of inductors combined with small coupling capacitors to cancel out these parasitic capacitances, rather than just reducing them. This works for both the differential-mode and common-mode filtering functions that EMI filters must perform, and it accommodates multi-phase power supply designs and varied inductance values. The result is an inductor or EMI filter that maintains clean, effective performance at much higher frequencies than conventional designs allow.
What you could build
High-performance EMI filter components or power supply chokes for switch-mode power supplies, data center power delivery, and electric vehicle inverters, sold to power electronics OEMs and component manufacturers who need cleaner high-frequency filtering in a compact design.
Who in Virginia should care
Defense electronics contractors and data center operators in Northern Virginia would have interest, as both require high-frequency power integrity and EMI compliance in dense electronic systems.
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
- June 16, 2009
- Status
- Granted patent
- Patent number
- 7548137
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.