Ballast circuit

H - Electricity – 05 – B

Patent

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Details

H05B 41/28 (2006.01) H02M 1/00 (2006.01)

Patent

CA 2335856

A circuit including a rectifier having rectifying diodes has a feedback signal which provides substantially linear operation of the rectifying diodes. In one embodiment, a ballast circuit includes a rectifier circuit coupled to an inverter circuit which energizes a fluorescent lamp. The inverter circuit includes a ballast capacitor coupled to an inductive feedback element. The voltages generated accross the ballast capacitors and the feedback element combine to provide a feedback signal that is effective to periodically bias at least one of the rectifying diodes to a conductive state during substantially the entire AC input signal. The substantially linear operation of the rectifying diodes enhances THD and PF performance of the circuit.

L'invention concerne un circuit qui comprend un redresseur à diodes bis de redressement. Ce circuit utilise un signal de réaction qui assure un fonctionnement sensiblement linéaire des diodes considérées. Selon une variante, on décrit un circuit de ballast comprenant un circuit redresseur couplé à un circuit inverseur qui excite une lampe fluorescente. Le circuit inverseur comprend un condensateur de ballast couplé à un élément de réaction par inductance. Les tensions établies aux bornes du condensateur de ballast et de l'élément de réaction par inductance se combinent pour fournir un signal de réaction. Celui-ci agit efficacement pour polariser périodiquement au moins l'une des diodes susmentionnées, jusqu'à atteindre un état conducteur pendant sensiblement toute la durée du signal d'entrée en courant alternatif. Le fonctionnement sensiblement linéaire desdites diodes permet d'améliorer les caractéristiques de la distorsion harmonique totale et du facteur de puissance du circuit.

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