Parallel-storage series-drive electronic ballast

H - Electricity – 05 – B

Patent

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Details

H05B 41/282 (2006.01) H02M 5/293 (2006.01) H02M 5/458 (2006.01)

Patent

CA 2276726

An electronic ballast is provided for converting an AC voltage and current, supplied by a power source such as a power line, to an alternating square-wave voltage and current having the same frequency, for supply to a discharge lamp. The ballast includes at least one capacitor, bridge switches and high- frequency duty-cycle switches. The bridge switches and the high-frequency duty- cycle switches cooperate to successively electrically connect the capacitor in parallel with the power source, electrically connect the capacitor in series with the power source and the discharge lamp, and to regulate the current provided to and from the capacitor to drive the discharge lamp with a desired square-wave voltage and current at the line frequency.

Ballast électronique servant à convertir une tension de courant alternatif et un courant alternatif alimenté par une source de puissance, telle qu'une ligne électrique, en une tension carrée alternative et en un courant de même fréquence, afin d'alimenter une lampe à décharge. Ce ballast comprend au moins un condensateur, des commutateurs en pont et des commutateurs de cycle de service haute fréquence. Ces commutateurs en pont et ces commutateurs de cycle de service haute fréquence coopèrent afin de coupler successivement le condensateur en parallèle à la source de puissance, de coupler le condensateur en série à la source de puissance et à la lampe à décharge et de réguler le courant alimentant le condensateur et provenant du condensateur, de manière à commander la lampe à décharge au moyen d'une tension carrée souhaitée et d'un courant à la fréquence de la ligne électrique.

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