Simple current limiting coupling for regulating the output current of a power supply
US5949661A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 7, 1998 |
| Grant date | Sep 7, 1999 |
| Priority date | — |
| Expiry date | Jan 7, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S323/902
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An output current limiting coupling for a switched-mode power supply is arranged to produce a feedback signal on the basis of the output current of the switched-mode power supply and to transmit it from the secondary side of the switched-mode power supply to its primary side by means of an opto-isolator (3). The coupling may include the following parts implemented with passive components: a bias voltage coupling (25, 26, 27, 28; 30, 31, 32, 33; 42, 43, 44, 45, 46) for forming a certain first potential to the first electrode of the light-emitting diode (3a) contained in the opto-isolator, and an input coupling (24) for producing a second potential formed on the basis of the output current to the second electrode of the light-emitting diode contained in the opto-isolator. The coupling is suitable for switched-mode power supplies regardless of whether the lighting of the light-emitting diode of the opto-isolator indicates a low or high value of the output current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.