Controllable inverter power supply

B - Operations – Transporting – 23 – H

Patent

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Details

B23H 7/14 (2006.01) B23K 9/10 (2006.01) H02M 5/275 (2006.01)

Patent

CA 2142776

In accordance with the present invention a power supply for providing an ac/dc output to a load is disclosed. The power supply includes a first source of dc power and an inverter that provides an ac output to the load. A second source of dc power is provided and selectably connects the first and second sources of dc power in series with the load when the output current reverses. In one embodiment the power sources are connected in series with every output current reversal. The first source of dc power is controllable and the magnitude of the dc current is responsive to a current reference signal. A control circuit provides the current reference signal, wherein the current reference signal is pulsed immediately prior to the ac output reversing polarity. The first source of dc power source preferably includes a buck converter that is switched at a variable frequency, depending upon the desired output current. In the event the user selects either an ac or dc electrode negative output a period of electrode positive dc energy is provided at start up to help establish the arc.

Cette invention concerne une alimentation électrique ca/cc. L'objet de l'invention comporte une première source de courant continu et un onduleur qui envoie du courant alternatif vers la charge. Une deuxième source de courant continu est prévue et permet de connecter les deux sources de courant continu en série avec la charge à l'occasion d'inversion de courant. Dans une variante, les sources sont connectées en série à toutes les inversions de courant. La première source de courant continu est réglable en fonction de l'amplitude d'un signal de référence fourni par un circuit de commande immédiatement avant l'inversion de polarité par le courant alternatif. La première source de courant continu comporte préférablement un convertisseur abaisseur de tension commuté à une fréquence variable selon le courant de sortie souhaité. Lorsque l'usager choisit une alimentation ca ou cc à l'électrode négative, du courant continu est fourni pendant une certaine période à l'électrode positive pour favoriser l'établissement de l'arc.

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