(57) The invention relates to a suppressor for an electronic ballast in a discharge lamp,
which is connected between a ballast and a mains supply, including a supply-voltage
rectifier (V1)) and a charging capacitor (C1), at least one energy-storing coil or
inductance (L1) and an electronic switch element (V2) connected such that, when said
switch element (V2) is conducting, a current path extends from the positive terminal
of the rectifier (V1) through said switch and coil to its negative terminal and, when
the switch (V2) is non-conducting, a current path extends from the positive terminal
of the rectifier through a diode (V3) and the charging capacitor (C1) to its negative
terminal. The switch element (V2) is controlled by means of a constant-frequency,
permanent pulse-ratio control up to an operating point to be determined in view of
a given momentary value of the mains voltage, whereafter the pulse ratio changes.
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