Drive circuit for a switchable heating transformer of an...

H - Electricity – 05 – B

Patent

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H05B 41/295 (2006.01)

Patent

CA 2628465

The drive signal for a switchable heating transformer of an electronic ballast should be capable of being produced in a simple manner. For this purpose, the invention provides for an oscillating inverter voltage, which has a variable inverter frequency, to be tapped off, for example, at the half-bridge center point. The inverter frequency is then preferably converted into a drive signal by a charge pump (C1, C2, D1, D2). As a function of this drive signal, the heating transformer (HT) is switched. Synchronization with externally controlled sequence control of the electronic ballast is therefore also possible.

Le signal de commande d'un transformateur commutable de chauffage d'un appareil électronique de pré-commutation doit pouvoir être réalisé de manière simple. Dans ce but, selon l'invention, une tension oscillante d'inverseur présente une fréquence modifiable d'inverseur, par exemple à prélever au centre d'un demi-pont. La fréquence d'inverseur est alors convertie de préférence à l'aide d'une pompe de charge (C1, C2, D1, D2) en un signal de commande. Le transformateur de chauffage (HT) est commuté en fonction de ce signal de commande. Cela permet également la synchronisation avec une commande extérieure du comportement de l'appareil électronique de pré-commutation.

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