Patent ID: 11911857
Assignee: ILLINOIS TOOL WORKS INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B  G | IPC B  G

Claim 11:
12. A remote interface device configured to be mounted on a pedestal of an articulating boom, the remote interface device comprising:
a user interface;
a first connector configured to connect to a power supply via a first cable;
a second connector configured to connect to a wire feeder via a second cable;
a third connector configured to couple to a first voltage sense lead;
communications circuitry configured to communicate with the power supply and the wire feeder; and
measurement circuitry configured to determine a voltage based on a first voltage signal received via the first voltage sense lead and a second voltage signal received from the wire feeder, the measurement circuitry comprising a matching circuit configured to scale the first voltage signal for measurement, the matching circuit comprising:
a first differential amplifier configured to compare the first voltage signal to a voltage reference signal;
a filter/scaling amplifier configured to scale an output of the first differential amplifier based on the voltage reference signal;
a second differential amplifier configured to compare the second voltage signal to the voltage reference signal; and
a third differential amplifier configured to compare an output of the filter/scaling amplifier to an output of the second differential amplifier, and to output a measurement signal representative of the voltage between a welding-type torch and a workpiece during a welding-type operation performed using the power supply and the wire feeder.