Hilti Aktiengesellschaft

Tridonicatco Gmbh & Co Kg

Alexander Nachbaur

Roland Schaer

Walter Wissmach

Alfred Tröstl

An electronic ballast for controlling the operating behavior and brightness of a gas discharge lamp, includes a full bridge circuit fed with a d.c. voltage (U). The gas discharge lamp is connected as a load of the full bridge circuit, and a control circuit in each case switches on one bridge diagonal and switches off another bridge diagonal of the full bridge circuit, alternatingly. The bridge diagonals each have a regulatable constant current source for regulating a lamp current, and thereby the occurrence of flickering appearances is suppressed. As a result, the lamp can be dimmed over a very wide range of brightnesses.

Electronic ballast with full bridge circuit

A method of reducing feedbacks on a temporary flow of current drawn from a network, during an operation of an inductive load, by active filtering of harmonics of a network fundamental component with a booster converter (6) and according to which the function of a necessary choke of the booster converter is taken up, at least partially, by the inductive load; and a booster converter for effecting the method, in which the function of the booster converter is integrated into the inductive load driving bridge circuit and into the motor, with at least one motor winding being so connected that it replaces, at least partially, the conventional booster converter choke.

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Fraxern, Austria

Alexander Nachbaur