On-time control for constant current mode in a flyback power supply
US7505287B1 · kind B1 · utility
45Cited by
4References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 9, 2006 |
| Grant date | Mar 17, 2009 |
| Priority date | — |
| Expiry date | Aug 3, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/33507
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention is a system and a method that controls the current limit such that it is maintained within a small range for any acceptable input voltages, e.g., 90 to 264 Volts RMS, causes the output voltage of a PWM controller to drop as the output load increases so as to maintain a constant current output, and does cycle by cycle calculation compensating for the VIN ripple output from the bridge and bulk filter capacitor so that no loop filter is required in the constant current mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.