Self oscillating, single-ended flyback converter with input voltage responsive control
US4504775A · kind A · utility
Inventor
Key dates
| Filing date | Jul 24, 1981 |
| Grant date | Mar 12, 1985 |
| Priority date | — |
| Expiry date | Jul 24, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J2207/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit arrangement for the controlled supply of loads, in particular portable devices, for example dry razors and electronic flash devices, or also fluorescent lamps or the like, on virtually any d.c. and a.c. systems of different frequencies and voltages, without switching over. For that purpose, the arrangement uses a blocking converter (5) which is controlled by means of two controllable semiconductor switches (T1, T2) in dependence on the current (I1) flowing through the primary winding (n1) of the converter (5) and in dependence on the input voltage (U1) of the supply, in such a way that the output power supplied follows a desired characteristic curve and in particular is constant. If the load to be supplied is an accumulator (2) with a motor (1) connected in parallel, the circuit arrangement can supply either the full motor power or, when the motor is switched off, a charging current for the accumulator (2). Additional control of the circuit arrangement is possible, in dependence on the load current, so that for example a motor can be adjusted in dependence on loading. When the arrangement supplies a fluorescent lamp, the light flux can be controlled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.