Patent ID: 7307236

Claim:
A transformerless weld circuit for use in a welder, the weld circuit comprising: a transformerless charge section including a first plurality of solid state switches, the charge section having a charge section input and a charge section output, the charge section input coupleable to a power source, whereby the first plurality of solid state switches perform an electrical transformation function in lieu of a transformer and provide a full wave rectification at the charge section output of a signal supplied at the charge section input; a capacitor section including a weld capacitor, the capacitor section having a capacitor section input and a capacitor section output, wherein the capacitor section input is coupled to the charge section output; and a weld section including a second plurality of solid state switches, the weld section having a weld section input and a weld section output, the weld section input being coupled to the capacitor section output and the weld section output being coupled to a plurality of weld terminals, wherein the second plurality of solid state switches operates to selectively couple the plurality of weld terminals to the capacitor section output.