Power supply for a load control device

H - Electricity – 05 – B

Patent

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Details

H05B 39/04 (2006.01) H02M 7/217 (2006.01)

Patent

CA 2709066

A power supply for a load control device generates a DC voltage and provides an asymmetrical output current, while drawing a substantially symmetrical input current. The power supply comprises a controllably conductive switching circuit for controllably charging an energy storage capacitor across which the DC voltage is produced. The energy storage capacitor begins charging at the beginning of a half-cycle and stops charging after a charging time in response to the magnitude of the DC voltage and the amount of time that the energy storage capacitor has been charging during the present half-cycle. The charging time is maintained substantially constant from one half-cycle to the next. The power supply is particularly beneficial for preventing asymmetrical current from flowing in a multiple location load control system having a master load control device supplying power to a plurality of remote load control devices all located on either the line-side or the load-side of the system.

L'invention concerne une alimentation électrique pour un dispositif de commande de charge qui génère une tension continue et délivre un courant de sortie asymétrique tout en consommant un courant d'entrée essentiellement symétrique. L'alimentation électrique comprend un circuit de commutation à conductivité commandable pour charger de manière commandable un condensateur de stockage d'énergie aux bornes duquel est produite la tension continue. Le condensateur de stockage d'énergie commence à se charger au début d'une demi-période et cesse de se charger après un temps de charge en réaction à l'amplitude de la tension continue et à la durée pendant laquelle le condensateur de stockage d'énergie a été chargé au cours de la demi-période actuelle. Le temps de charge est maintenu essentiellement constant d'une demi-période à une autre. L'alimentation électrique est particulièrement avantageuse pour empêcher un courant asymétrique de circuler dans un système de commande de charge à emplacements multiples comprenant un dispositif de commande de charge maître qui alimente en énergie une pluralité de dispositifs de commande de charge distants se trouvant tous soit du côté ligne, soit du côté charge du système.

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