On-time control for constant current mode in a flyback power supply
US7443700B2 · kind B2 · utility
17Cited by
3References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 7, 2007 |
| Grant date | Oct 28, 2008 |
| Priority date | — |
| Expiry date | May 7, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0006
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A primary side sensing power control system and method for constant current control that utilizes a relationship that involves the measured reset-time from the previous cycle to determine the primary side peak current and off-time for the next cycle. This control mechanism does not need the knowledge of input voltage or magnetizing inductance. Therefore, it removes the sensitivities of input voltage and magnetizing inductance to the output current limit. Furthermore, it uses a time measurement instead of a voltage measurement for the current calculation which in many cases is easier to perform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.