Tridonicatco Gmbh & Co Kg

Peter Hein

Alexander Barth

Werner Ludorf

Reinhard B&ouml;ckle

An electronic ballast which includes a resonant load circuit (L, C) in series with a discharge lamp (LA), the resonant load circuit being supplied by an inverter (S, S) which outputs variable alternating voltages at frequencies above 200 KHZ. Alternatively, an electronic transformer incorporates a load circuit and a variable output frequency inverter for operating a low volt halogen lamp () at variable alternating frequencies above 200 KHZ. Passive components of the ballast and transformer are integrated into a multilayer circuit ().

Electronic ballast and electronic transformer

A circuit and a method for controlling light emitting diodes (D , D ) for illumination involve an inverter whose output frequency can be varied. The inverter includes two electronic switches (S , S ) which convert an applied direct current voltage (U ) into an alternating voltage. A load circuit is connected to the output of the inverter and includes a resonance element and at least one light emitting diode (D , D ) whose brightness is controlled by altering the output frequency of the inverter.

Drive for light-emitting diodes

The invention relates to a control circuit for at least one light-emitting diode ( ) for adjusting the current and/or the voltage of the light-emitting diode ( ) to a desired value adjusted by means of a controller ( ), the current, the voltage and/or the luminescence of the light-emitting diode ( ) being detectable and comparable with the desired value.

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Fraxern, Austria

Peter Hein