Switching converter and control circuit thereof, current sensing method, AC/DC converter, and power adaptor and electronic devices
US9735689B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 16, 2015 |
| Grant date | Aug 15, 2017 |
| Priority date | — |
| Expiry date | Nov 4, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0009
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control circuit is used in a switching converter including at least, a switching transistor and a coil connected to the switching transistor. The control circuit includes: a current comparing circuit that asserts a peak current sensing signal when a current flowing in the coil during the ON period of the switching transistor reaches a threshold current. The current comparing circuit includes: a first comparator that compares a sensed voltage according to the current flowing in the switching transistor and the coil with a threshold voltage defining the threshold current, and generates a comparison signal; and a variable delay circuit that generates the peak current sensing signal by delaying the comparison signal, a delay amount of the variable delay circuit varying according to a period of time from a turn-on of the switching transistor to a transition of the comparison signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.