Self oscillating, single-ended flyback converter with input voltage responsive control
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 which is controlled by means of two controllable semiconductor switches in dependence on the current flowing through the primary winding of the converter and in dependence on the input voltage 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 with a motor 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. 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.
- Assignee:
- EDB-85-148875
- Patent Number(s):
- US 4504775
- OSTI ID:
- 5382263
- Resource Relation:
- Patent Priority Date: Priority date 29 Nov 1980, Germany, Federal Republic of (F.R. Germany); Other Information: PAT-APPL-287720
- Country of Publication:
- United States
- Language:
- English
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