Generator for arc welder with high power factor

B - Operations – Transporting – 23 – K

Patent

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Details

B23K 9/10 (2006.01) H02M 1/42 (2007.01) H02M 7/48 (2007.01)

Patent

CA 2515111

A generator for arc welder, of the type composed of a rectifier stage (100) followed by a PFC stage (200) and by an inverter stage (300), both of the high- frequency type, the latter stage supplying power to a final rectifier stage for a welding arc (404), the PFC stage being composed of two inductors (203, 204) that are mutually magnetically coupled, two diodes (212, 213) with opposite conduction directions, two leveling capacitors (216, 217) and means for controlling the succession of the on and off switchings of the two first switches, so as to shape the current absorbed by the rectifier stage by correlating it to the waveform of the line voltage. The inverter stage comprises four triads of second controlled switches, diodes and capacitors, and there is also a control device for the four second switches and for the current for the final stage that supplies power to the welding arc.

L'invention concerne un générateur pour soudeur à l'arc, du type de ceux qui se composent d'un étage redresseur (100) suivi d'un étage PFC (200) et d'un étage onduleur (300), tous deux étant du type à haute fréquence, l'étage onduleur fournissant de l'énergie à un étage redresseur final pour générer un arc de soudage (404). L'étage PFC comprend deux bobines d'induction (203, 204) couplées l'une à l'autre par voie magnétique, deux diodes (212, 213) possédant des sens de conduction opposés, deux condensateurs de mise à niveau (216, 217) et des moyens permettant de commander la succession de mises en marche et de mises hors tension des deux premiers interrupteurs, afin que le courant absorbé par l'étage redresseur soit modelé par sa mise en corrélation avec la forme d'onde de la tension composée. L'étage redresseur comprend quatre groupes composés chacun d'un second interrupteur commandé, d'une diode et d'un condensateur, et un dispositif de commande pour les quatre seconds interrupteurs et pour le courant destiné à l'étage final qui fournit de l'énergie à l'arc de soudage.

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