Emergency power supply to replace a main power supply on a...

H - Electricity – 02 – J

Patent

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Details

H02J 9/06 (2006.01) H02M 1/00 (2006.01)

Patent

CA 2222006

The invention concerns an emergency power supply to supply power in the event of an interruption in direct current input voltage (Ve) from a main power supply (15) by supplying to a load (10) a voltage greater than a threshold value (Vmin). The main power supply (15) under normal operation supplies to the load (10) direct current input voltage (Ve), this direct current input voltage (Ve) being greater than the threshold value (Vmin) and between a minimum input voltage (Ve1) and a maximum input voltage (Ve2). The emergency power supply includes a capacitor (13) of which the load is provided for by the direct current input voltage (Ve). According to the invention, the emergency power supply comprises means (20, 21) of limiting the load of the capacitor (13) to a reference voltage (Vr) lower than the maximum input voltage (Ve2). The invention offers an advantage in terms of the size and cost of the capacitor (13) of the emergency power supply.

L'invention concerne une alimentation de secours, du type destinée à suppléer provisoirement à une absence d'uns tension d'entrée continue (Ve) issued'une source d'alimentation principale (15) en fournissant à une charge (10) unetension supérieure à une valeur de seuil (Vmin). La source d'alimentation principale (15) fournit en fonctionnement normal à la charge (10) la tension d'entrée continue (Ve), cette tension d'entrée continue (Ve) étant supérieure à la valeur de seuil(Vmin) et comprise entre une tension minimale d'entrée (Ve1) et une tension maximale d'entrée (Ve2). L'alimentation de secours comprend un condensateur (13)dont la charge est assurée par la tension d'entrée continue (Ve). Selon l'invention, l'alimentation de secours comporte des moyens (20, 21) de limitation de la charge du condensateur (13) à une tension de référence (Vr) inférieure à la tension maximale d'entrée (Ve2). L'invention permet un gain en encombrement et en coût du condensateur (13) de l'alimentation de secours.

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