H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 37/02 (2006.01) H05B 41/232 (2006.01) H05B 41/28 (2006.01) H05B 41/391 (2006.01)
Patent
CA 2288087
The present invention relates to a ferroresonant transformer ballast for regulating the current of gas discharge lamps, the ballast comprising a magnetic core; a first coil wound about the magnetic core and energizable from a variable source for supplying a changing input voltage and current; a second coil wound about the magnetic core and magnetically coupled to the first coil so as to induce a voltage across terminals of the second coil in response to a change in current from the first coil; an output capacitor connected across the terminals of the second coil for resonance; a third coil wound about the magnetic core and magnetically coupled to the second coil so as to induce a voltage across terminals of the third coil in proportion to the average voltage across the output capacitor; at least one gas discharge lamp connected across terminals of the third coil whereby voltage across the gas discharge lamp is regulated in response to the average voltage of the output capacitor; a control inductor to be switchably coupled in electrically parallel relationship with the output capacitor; and means for switching the control inductor in a pulsing manner into and out of parallel relationship with the output capacitor in response to a current level of the gas discharge lamp to substantially maintain the current level of the gas discharge lamp at a predetermined value when the lamp is operating in a steady state mode, the switching means including a switch having terminals coupled in series with the control inductor.
L'invention porte sur un ballaste ferrorésonnant qui régule le courant d'une lampe à décharge à gaz (138). Le concept de cette invention repose principalement sur l'utilisation d'un enroulement (136) ajouté en parallèle à la lampe à décharge à gaz. Un autre concept de cette invention repose sur l'utilisation d'un inducteur placé en parallèle dans le condensateur de sortie de façon à réduire l'intensité d'éclairage de la lampe (138), c'est-à-dire réguler le courant soutiré par la lampe (138).
Norton Rose Or S.e.n.c.r.l.,s.r.l./llp
Shape Electronics Inc.
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