Switch mode power supply systems
US7525823B2 · kind B2 · utility
5Cited by
32References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2006 |
| Grant date | Apr 28, 2009 |
| Priority date | — |
| Expiry date | Dec 16, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0009
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus for sensing the output current in a switch mode power supply (SMPS) using primary side sensing are described. A system includes a primary current sense input, a charge input to sense a charging time of an SMPS transformer; a discharge input to sense a discharging time of the transformer; at least one averager; and a calculator. The primary current is averaged by the averager over at least a switching cycle of the SMPS and the calculator estimates the output current of the SMPS using the averaged primary current, the charge signal and the discharge signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.