Frequency band avoidance in an on-demand switched-power converter circuit
US12316217B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 2023 |
| Grant date | May 27, 2025 |
| Priority date | — |
| Expiry date | Jan 29, 2044 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/158
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method implemented by a control circuit reduces electromagnetic interference (EMI) generation in a switched-mode power supply. The power supply adjusts operating frequency in response to a change in operating condition, and the method avoids certain bands of frequencies, for which switching should be avoided to avoid generating EMI in the band(s). The method includes determining a disallowed cycle time period range corresponding to the band(s) of frequencies by detecting that a switching event for the adjusted operating frequency would cause a switching cycle period to be within the disallowed time period range, and in response, preventing switching of the switched-mode power supply that would cause an end of a switching cycle to occur within the disallowed cycle time period range, and permitting switching of the switched-mode power supply that would cause the end of the switching cycle to occur outside of the disallowed cycle time period range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.