Flyback switching regulator with primary side regulation
US8884551B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 14, 2013 |
| Grant date | Nov 11, 2014 |
| Priority date | — |
| Expiry date | May 3, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The disclosed switching regulator, including a controller for a switching regulator, is adaptable to supplying, or controlling the supply of, regulated current to a load that is isolated from a source of input power by a flyback transformer, and includes: (a) detecting, after transistor SWOFF, a zero crossing ZCD corresponding to a primary side switching node voltage VSW decreasing to the input voltage Vin, which occurs after a secondary current IS is substantially zero and before the next SWON; (c) establishing a time-integral window T-I_W with a leading edge corresponding to SWOFF and a trailing edge corresponding to ZCD; and (d) modulating at least the time SWOFF relative to SWON based on the primary peak current IPP at SWOFF and the time-integral window, such that a regulated load current is supplied to the load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.