Control circuit, system and method for switched-mode power supply
US12249919B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 2023 |
| Grant date | Mar 11, 2025 |
| Priority date | — |
| Expiry date | Nov 15, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control circuit, system and method for switched-mode power supply are disclosed, the control circuit is for driving a first switch to convert an input voltage into an output voltage. The control circuit includes an on-time control unit, which receives a first signal characterizing switching frequency of first switch and a second signal characterizing current flowing through first switch and responsively generates a signal indicative of a turn-off instant for first switch. When a peak value of the current flowing through the first switch drops below a predefined value, the on-time control unit determines the turn-off instant for the first switch based on the first signal so that the switching frequency of the first switch is maintained at a target frequency. This design can effectively avoid the generation of audible noise, stabilize the output voltage against load changes while maintaining desirable efficiency, and ensure operational safety of the switched-mode power supply.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.