Method and circuit arrangement for generating current pulses...

C - Chemistry – Metallurgy – 25 – D

Patent

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Details

C25D 5/18 (2006.01) H03K 5/003 (2006.01)

Patent

CA 2241055

A process is disclosed for generating short, cyclically repeated unipolar or bipolar electroplating pulse-shaped currents IG, IE, as well as an electroplating circuitry with which such pulse-shaped currents IG, IE can be generated. Such electroplating processes are known as pulse-plating processes. The secondary winding (6) of a current transformer (1) is connected in series to the electroplating direct current circuit (5) which consists of a bath direct current source (2) and a bath resistor (RB) formed by an electroplating cell (4). The primary winding (7) of the transformer has a larger number of turns than the secondary winding. The primary winding is driven with high- voltage and relatively low-current pulses. The high pulsed current at the secondary side temporarily compensates in a pulsed manner the electroplating direct current. This compensation may be a multiple of the electroplating current, producing high amplitude demetallisation pulses. The capacitor (10) leads the compensation current by charge and discharge. Thanks to the invention, known electronic heavy current isolating switches which are uneconomical in operation because of high current conductivity losses may be dispensed with for the pulse plating.

L'invention concerne un procédé qui permet de générer des courants pulsés I¿G?, I¿E? unipolaires ou bipolaires de courte durée qui se répètent cycliquement et servent à la galvanoplastie, ainsi qu'un circuit de galvanisation qui sert à générer de tels courants pulsés I¿G?, I¿E?. Ces procédés de galvanoplastie sont connus sous le nom de procédé de galvanoplastie par impulsions. Selon l'invention, l'enroulement secondaire (6) d'un transformateur de courant (1) est connecté en série au circuit à courant continu de galvanisation (5), qui lui est constitué d'une source de courant continu (2) pour bain et d'une résistance R¿B? pour bain, la résistance étant formée d'une cellule de galvanoplastie (4). L'enroulement primaire (7) du transformateur de courant a un nombre de spires plus grand que celui de l'enroulement secondaire. L'enroulement primaire est attaqué avec des impulsions de haute tension et de courant relativement faible. Le haut courant pulsé du côté secondaire compense temporairement par impulsions le courant continu de galvanoplastie. Cette compensation peut s'élever à un multiple du courant de galvanoplastie, produisant des impulsions de démétallisation de haute amplitude. Le condensateur (10) guide par charge et décharge le courant de compensation. Grâce à cette invention, il n'est plus nécessaire d'utiliser, pour la galvanoplastie par impulsions, les interrupteurs électroniques connus à maximum de courant dont le rendement est faible à cause des pertes élevées de conduction de courant.

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