Circuit arrangement

H - Electricity – 05 – B

Patent

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Details

H05B 41/38 (2006.01) H05B 41/28 (2006.01) H05B 41/392 (2006.01)

Patent

CA 2191462

A dimming ballast for use with a phase control dimmer, and particularly a triac dimmer, includes an EMI filter selected with a high impedance to avoid excessive voltage and peak currents in the filter due to resonance with the phase controlled AC waveform at low conduction angles, when the load presented by the lamp is low. The ballast also includes a DC-DC-converter of the switched mode type that keeps the EMI filter loaded and prevents misfiring of the triac dimmer and thereby flickering of a lamp operated with the dimming ballast.

Ce ballast de gradation associé à un gradateur à commande de phase, et notamment à un gradateur à triac, est muni d'un filtre antiparasite choisi pour sa forte impédance, afin d'éviter les tensions excessives et les pics d'intensité dans le filtre résultant de la résonance avec le signal en courant alternatif à commande de phase au niveau d'angles de conduction réduits, lorsque la charge présentée par la lampe est faible. Le ballast comprend également un convertisseur continu-continu du type à mode de commutation, qui maintient la charge du filtre antiparasite et évite les ratés d'amorçage du gradateur à triac, et par voie de conséquence le papillotement de la lampe associée au ballast de gradation.

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