G - Physics – 05 – F
Patent
G - Physics
05
F
323/10
G05F 1/455 (2006.01) H02M 1/084 (2006.01) H02P 27/02 (2006.01)
Patent
CA 2008127
A method and apparatus for controlling single or polyphase a.c. power controllers when controlling a.c. power controllers by means of phase angle control of semiconductor switches, the firing signals on the one hand must be long enough to guarantee a reliable firing and, on the other hand, be short enough to prevent an overloading of ignition amplifiers. According to the invention, therefore the use of firing signals with variable temporal lengths is provided, which end at least approximately at the reincrease of the current flowing in the phase that has been fired. Moreover devices for implementing the method are specified.
Méthode et appareil pour commander des régulateurs de c.a. mono ou polyphasé quand on veut commander des régulateurs de c.a. au moyen du contrôle de l'angle de phase d'interrupteurs à semiconducteur. Les signaux d'amorçage doivent, d'une part, être assez longs pour garantir un amorçage fiable et, d'autre part, être assez courts pour prévenir une surcharge des amplificateurs d'amorçage. Selon l'invention, on utilise donc des signaux d'amorçage à durée variable qui prennent fin au moins approximativement à la remontée du courant dans la phase qui a été amorcée. L'invention décrit en outre des dispositifs pour appliquer la méthode.
Doerwald B. Claus
Runggaldier Diethard
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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