Patent-treuhand-gesellschaft Fuer Elektrische Gluehlampen Mbh

Osram Sylvania Inc.

Gerwin Thiel

Peter Helbig

Andrew Johnsen

Guenther Hirschmann

John Cross

Arnulf Rupp

Simon Jerebic

Bernhard Ertl

Uwe Kantim

Wolfgang Kumpf

Gerhard D&ouml;ll

Werner Berlinghof

Andrew O Johnsen

A ballast () for powering at least one gas discharge lamp () comprises a switching converter () and an inverter (). Switching converter () includes a transistor () and a control circuit () that provides substantially zero voltage switching of the transistor () at a very high frequency. Preferably, control circuit () includes a drive circuit (), a turn-on synchronization circuit (), a current mirror circuit (), a rail voltage regulator circuit (600), and a lamp current regulator circuit (). Drive circuit () is preferably realized by a circuit arrangement that includes a standard pulse-width modulation integrated circuit ().

Ballast with zero voltage switching converter

A dielectric barrier discharge lamp has elongated electrodes ( ) that are arranged on the inside of the wall of the discharge vessel ( ) and are covered by a dielectric layer ( ). Arranged on the outside of the wall of the discharge vessel ( ) is an electrically conductive means ( ) that is limited with reference to the longitudinal axis to a subregion (B) of the discharge vessel wall, for example a metal ring. The startability of the dielectric barrier discharge lamp when first being started or after long operational pauses is improved thereby.

Dielectric barrier discharge lamp having an ignition means

To ensure reliable electric contact, a discharge lamp has a tubular lamp vessel ( ), a lamp base ( ) and lamp electrodes ( ) which are applied to the wall of the lamp vessel ( ) and in each case have an electrode section ( ) which is arranged outside the interior ( ) of the lamp vessel ( ) and serves as supply lead. The electric base contacts ( ) are connected in each case to an electrically conductive spring element ( ), each spring element ( ) bearing against the wall of the at least one tubular lamp vessel ( ) and making an electric contact between in each case one electrode section ( ), arranged outside the lamp vessel ( ), and a base contact ( ).

Discharge lamp

The invention relates to a method for operating a discharge lamp, which has at least one dielectrically impeded electrode ( ), on a flyback converter, which applies periodically recurring voltage pulses to the discharge lamp (La ). If the discharge lamp (La ) has a starting aid ( ), the voltage amplitude (U ) of the voltage pulses is successively raised until a dielectrically impeded discharge is formed in the discharge lamp, and until the voltage amplitude (U ) has reached the nominal operating voltage. If the discharge lamp (La ) has no starting aid, a first discharge which causes a partial ionization of the discharge medium is firstly ignited in the discharge lamp (La ). Immediately after the first discharge has been brought back to extinction, a dielectrically impeded discharge is ignited anew, and the voltage amplitude (U ) of the voltage pulses is increased until the nominal operating voltage of the discharge lamp (La ) is reached.

Operating method for a discharge lamp having at least one dielectrically impeded electrode

A circuit arrangement for operating at least one high-pressure discharge lamp with a high-frequency alternating voltage, the circuit arrangement having a voltage converter (W) with an alternating voltage output (j,j,), a load circuit which is connected to the alternating voltage output (j,j,) and which has at least one lamp inductor (L,), a coupling capacitor (C,) and terminals (j,j,) for at least one high-pressure discharge lamp (LP), and a starter (Z) with a high-voltage source and a high-voltage DC output (j,j,) for starting a gas discharge in the at least one high-pressure discharge lamp (LP). The coupling capacitor (C,) is connected to the high-voltage DC output (j,j,) via a charging resistor (R,).

Circuit arrangement and method for operating at least one high-pressure discharge lamp

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Eichenau, Germany

Gerwin Thiel