Output overvoltage protection method and circuit for switching power supply and switching power supply thereof
US9525283B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 8, 2014 |
| Grant date | Dec 20, 2016 |
| Priority date | — |
| Expiry date | Jun 27, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/202
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In one embodiment, an output overvoltage protection method for a switching power supply, can include: (i) charging a first capacitor by a first current during a first time interval of a switching period of the switching power supply; (ii) charging a second capacitor by a second current during a second time interval of the switching period of the switching power supply; and (iii) generating an overvoltage protection signal by comparing a first voltage across the first capacitor against a second voltage across the second capacitor at the end of the second time interval, where the overvoltage protection signal is active when the first voltage is at least as high as the second voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.