A drive circuit arrangement for a gas discharge lamp

H - Electricity – 05 – B

Patent

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Details

H05B 41/26 (2006.01) H05B 41/28 (2006.01) H05B 41/282 (2006.01)

Patent

CA 2280030

A drive circuit arrangement for a gas discharge lamp, comprises: a) a self resonating inverter for providing a drive voltage across a load impedance, the inverter having a pair of field effect transistors (1, 2) which operate in anti-phase; b) a tank circuit (10, 11, 12) for cancelling the reactive component of the load impedance coupled to the inverter; c) a voltage division circuit (7, 8) which provides a given fraction of the said drive voltage to the gates of the field effect transistors; and d) phase shifting means comprising an inductance (9) in series with the tank circuit for shifting the phase of the given fraction of the drive voltage. The voltage division circuit is provided with a voltage limiter (13, 14) which in operation provides a further phase shift to the given fraction of the drive voltage when the drive voltage exceeds a given threshold value, increasing the resonant frequency of the inverter and limiting the peak drive voltage.

L'invention concerne un circuit de commande pour lampe à décharge gazeuse comprenant a) un onduleur de à autorésonance qui fournit une tension d'attaque à travers une impédance de charge, l'onduleur comportant une paire de transistors (1, 2) à effet de champ qui fonctionnent en opposition de phase, b) un circuit bouchon (10, 11, 12) permettant d'annuler la composante réactive de l'impédance de charge reliée à l'onduleur, c) un circuit diviseur de tension (7, 8) qui fournit une fraction donnée de ladite tension d'attaque aux grilles des transistors à effet de champ et d) des moyens de déphasage comprenant une induction (9) montée en série avec le circuit bouchon permettant de déphaser la fraction donnée de ladite tension d'attaque. Le circuit diviseur de tension est pourvu d'un limiteur de tension (13, 14) qui, lors de son fonctionnement, déphase la fraction donnée de la tension d'attaque, lorsque la tension d'attaque dépasse une valeur de seuil donnée, ce qui a pour effet d'augmenter la fréquence de résonance de l'onduleur et de limiter la tension d'attaque de pointe.

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