control device for a converter - stromventil for operation of a gasurladdningsror from a likstromskella

摘要

A converter-current valve (1) for operating a discharge tube (LR) from a D.C. source, comprises a transformer, across the secondary winding (D) of which the gas discharge tube (LR) is connected and across the primary winding (B, C) of which in RC-circuit (A) is connected in series with the base-collector circuit of a power transistor (Tu1u), the emitter of the power transistor (Tu1u) is connected to the ground pole of the D.C. source, while a tap on the primary winding (B, C) is connected to the plus pole of the D.C. source, which tap divides the primary winding into an operating winding (B) and a feed-back winding (C) for the RC-circuit (A). In this converter-current valve (1) there exists, according to the invention, a control device (2) for controlling the light flux from the gas discharge tube. This control device (2) comprises a transistor (Tu2u), the collector of which is connected to the interconnection point between the RC-circuit (A) and the base of the power transistor (Tu1u) and the emitter of which is connected to the ground pole of the D.C. source and the base of which is connected to a control pulse source (S) for emitting rectangular pulses for controlling the light flux of the gas discharge tube (LR), in dependence of the pulse ratio of the pulses emitted by the control pulse circuit.