Compensated active electro-magnetic interference filters
US10374510B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2017 |
| Grant date | Aug 6, 2019 |
| Priority date | — |
| Expiry date | Sep 26, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An active electromagnetic interference (EMI) filter includes an amplifier configured to sense noise signals on a power conductor, and drive a cancellation signal onto the power conductor. The cancellation signal is to reduce the amplitude of the noise signals. Some embodiments of the active EMI filter include a high frequency compensation network that improves the high frequency phase margin of the active EMI filter and improves the stability of the active EMI filter at high frequencies. Some embodiments of the active EMI filter include a low frequency compensation capacitor that increases the phase margin of the active EMI filter at low frequencies. Some embodiments of the active EMI filter include low frequency compensation circuitry that increases the low frequency tolerance of the active EMI filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.