Balanced EMI noise cancellation for PFC boost converters
This technology reduces electromagnetic interference (EMI) in switching power supplies — the kind used in almost every electronic device — by cleverly splitting the main inductor into two parts and tuning their ratio to cancel out unwanted electrical noise. The approach analyzes the power supply as a balanced bridge circuit, then achieves balance by either adjusting the inductor split or adding a small capacitor, eliminating the noise at its source rather than filtering it after the fact. The result is up to 40 dB of common mode noise reduction, which is a dramatic improvement, without adding expensive or bulky filter components. This means smaller, cheaper, more efficient power supplies that still pass regulatory EMI compliance tests.
What you could build
A licensed design methodology or IP block for power supply engineers at consumer electronics, EV charging, and industrial equipment manufacturers, enabling them to meet FCC/CE EMI limits with simpler, cheaper filter stages built into boost converters and PFC circuits.
Who in Virginia should care
Defense electronics contractors and power electronics suppliers in Northern Virginia and the Hampton Roads corridor, where EMI compliance is a recurring design challenge for military and commercial power 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 Lee, Pengju Kong
- Granted
- September 28, 2010
- Status
- Granted patent
- Patent number
- 7804281
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.