Blocking oscillator switched mode power supply
US4648016A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1984 |
| Grant date | Mar 3, 1987 |
| Priority date | — |
| Expiry date | Aug 17, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/33523
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a blocking oscillator switched mode power supply which is supplied with a primary voltage U.sub.p obtained by rectification of the AC line voltage. Because the line voltage varies, the secondary voltage which supplies electrical equipment is stabilized by means of a switched mode power supply. The maximum power from the supply generally depends on the primary voltage U.sub.p. The present invention has the objective of eliminating this disadvantage of the known switched mode power supplies. To this end, according to the invention, a correction circuit actuated via a voltage divided is provided, the voltage divider being connected to the primary voltage U.sub.p. The correction circuit is designed so that it keeps the breakpoint of the secondary current I.sub.s constant. It is thus possible to economize on the normally required overdimensioning of certain parts of the circuit, especially of the transformer, converter, and switching transistor, while on the other hand the invention can be realized at little cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.