Startup circuit and method for AC-DC converters
US9450484B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 2013 |
| Grant date | Sep 20, 2016 |
| Priority date | — |
| Expiry date | Feb 2, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/33507
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An AC-DC power converter includes a rectifying unit for generating a rectified voltage, an output stage for converting the rectified voltage into a DC voltage for a load, a controller for controlling the output stage, and a start-up circuit. The start-up circuit includes a start-up voltage generator coupled to the rectifying unit and configured to generate a start-up voltage from the rectified voltage and to output the start-up voltage to the controller to provide power for operation of the controller before the output stage starts outputting power. The start-up voltage generator includes a first depletion mode transistor having a first terminal configured to receive the rectified voltage, a second terminal configured to output at least partially the start-up voltage, and a gate terminal which is grounded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.