Reduction of audible noise in a power converter
US10003270B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 2017 |
| Grant date | Jun 19, 2018 |
| Priority date | — |
| Expiry date | Dec 26, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A controller includes a drive circuit that generates a drive signal to switch a power switch to control a transfer of energy to of a power converter output in response to a current sense signal, a feedback signal, and a current limit signal. A current limit generator generates the current limit signal in response to a load coupled to the output. An exclusion frequency range detection circuit generates a frequency skip signal in response to the drive signal to indicate when an intended frequency of the drive signal is within an exclusion frequency window. The current limit signal is unvarying for at least a switching cycle when the intended frequency of the drive signal is within the exclusion frequency window. A first latch generates a hold signal to control the current limit generator to hold the current limit signal in response to the frequency skip signal and the feedback signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.