Fluorescent lamp ballast for pulsed-mode operation.

摘要: A fluorescent lamp ballast for pulsed-mode operation and the use of a self-excited or externally controlled half full bridge circuit same purpose are disclosed. An electronic that type has buffered direct voltage supply (Udc, udc) may be drawn from effective power lamps. The load in which lamps arranged choke (L1) connected series, if necessary capacitor (C1) parallel to starting purposes. Such should designed such way it allows characteristic values light, i.e. its luminosity factor colour temperature, modified without mechanically switching choke. For purpose, at least one element (S1) pair elements (S1, S2, S3, S4) periodically with pulses (uac). pairs (uac) frequency-modulated (f1, f2) by means control signal (f). This frequency-modulation ensured gradual continuously periodical frequency alternation (sinusoidally), so is constantly no disturbing standing waves could provoke an optical flickering formed lamp.