Switch mode power supply systems
US7583519B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2008 |
| Grant date | Sep 1, 2009 |
| Priority date | — |
| Expiry date | Jan 22, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0009
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This invention relates to methods and apparatus for sensing the output current in a switch mode power supply (SMPS) using primary side sensing. We describe a module which senses a current in a primary winding of a transformer and a voltage on a primary or auxiliary winding of the transformer, and which includes a multiplier coupled to an output of a signal averager averaging a primary winding current and to an output of a timing signal generator using the sensed voltage to signal when a secondary winding is powering an output of the SMPS, to multiply an averaged current sense signal by a fraction of a total cycle period of said SMPS during which the secondary winding is providing power to provide a signal estimating an output current of the SMPS.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.