Patent ID: 11858073
Assignee: ILLINOIS TOOL WORKS INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B  H | IPC B  H

Claim 14:
15. A welding, cutting, or heating circuit, comprising:
an input leg comprising a first 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 first capacitor to current in a parasitic output inductance of a load coupled to the pulse width modulating leg via a pair of pulse width modulating transistors;
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 via a pair of steering transistors, the output arranged between the pulse width modulating leg and the steering leg;
an output clamp leg comprising a second capacitor, such that peak current in the second capacitor during polarity reversal matches a current in the inductor or the parasitic output inductance of the welding or cutting cables; and
a blocking diode arranged between the first and second capacitors, the blocking diode to allow current originating at the first capacitor to flow to the second capacitor at a first polarity.