Soft start of a switching power supply system
US6683442B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2002 |
| Grant date | Jan 27, 2004 |
| Priority date | — |
| Expiry date | Aug 15, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S323/901
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A synch FET power supply uses a plurality of electronic switches to periodically connect the primary of a transformer to a direct current input source of power to generate a time varying magnetic field. The time varying magnetic field is coupled to two secondary windings. An electronic switch connected to each secondary winding periodically connects its secondary to the other output terminal. A reference voltage is applied to the control circuits, and the control circuits adjust the switches so that the output voltage tracks the reference voltage. Logic AND gates control the “turn on” signals to the electronic switches in the secondary circuits so that the secondary windings are not connected to an output terminal until a “synch FET enable” signal is applied to the AND gates. During soft start, the secondary windings remain disconnected from an output terminal until a “synch FET enable” signal is applied to an input of the logic AND gates, and since the secondary windings do not provide a complete circuit between the output terminals, no power flows into the synch FET power supply even though a back bias is applied between the output terminals by…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.