SYSTEMS AND METHODS FOR EFFICIENT PROVISION OF ARC WELDING POWER SOURCE

摘要

Methods and systems for creating and controlling an AC output for welding, plasma cutting or heating are provided. One embodiment of the present disclosure achieves a desired square wave AC output and reduces the number of circuit components needed by combining components of a buck converter and a full bridge inverter. Current flow paths through a power control circuit that are generated via switching of transistors in the circuit on and off are provided. In one embodiment, a pulse width modulation leg, which controls the level of current flow through an inductor, is provided. Certain embodiments include a bidirectional buck converter that converts an unregulated DC flow to a regulated DC flow through an inductor. In one embodiment, a steering leg is provided, which controls a direction of current flow through the inductor. Additionally, an output clamp circuit, which suppresses the parasitic load inductance during polarity reversal is provided.

主权项

1. A welding, cutting, or heating circuit, comprising:
an input leg comprising a capacitor; a pulse width modulating leg coupled to the input leg, wherein the pulse width modulating leg is configured to convert direct current (DC) voltage from the capacitor to current in a parasitic output inductance of a load coupled to the pulse width modulating leg; and a steering leg coupled to the pulse width modulating leg, wherein the steering leg is configured to determine a direction of current flow through an output