DISTORTION FREE ARC WELDING VOLTAGE MEASUREMENT
First Claim
1. An apparatus, comprising:
- a first feedback circuit configured to provide a head voltage of an arc welding apparatus to a power supply of the arc welding apparatus;
a first measurement wire coupled to a head of the arc welding apparatus and to a first input of the feedback circuit to provide the head voltage and noise induced on the first measurement wire to the feedback circuit; and
a first reference wire coupled to a first reference node of the arc welding apparatus and to a second input of the first feedback circuit to provide noise induced on the first reference wire to the feedback circuit, wherein the first reference node is proximate to and electrically isolated from the head of the arc welding apparatus;
wherein the first feedback circuit is configured to determine the head voltage as a difference between the noise of the first reference wire and the head voltage and noise of the first measurement wire.
1 Assignment
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Accused Products
Abstract
Methods and systems to reduce distortions induced in a voltage measurement wire. In an embodiment, a measurement wire is coupled to a head of an arc welding apparatus and to a feedback circuit to provide a head voltage and noise induced on the measurement wire to the feedback circuit. A reference wire is coupled to a reference node and to the feedback circuit to provide noise induced on the reference wire to the feedback circuit. The reference node may be proximate to and electrically isolated from the head, and the measurement wire and the reference wire may be arranged adjacent to one another (e.g., as a twisted pair), so that the similar distortions are induced in the measurement wire and the reference wire. The feedback circuit determines the head voltage as a difference between noise of the reference wire and the head voltage and noise of the first measurement wire.
0 Citations
20 Claims
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1. An apparatus, comprising:
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a first feedback circuit configured to provide a head voltage of an arc welding apparatus to a power supply of the arc welding apparatus; a first measurement wire coupled to a head of the arc welding apparatus and to a first input of the feedback circuit to provide the head voltage and noise induced on the first measurement wire to the feedback circuit; and a first reference wire coupled to a first reference node of the arc welding apparatus and to a second input of the first feedback circuit to provide noise induced on the first reference wire to the feedback circuit, wherein the first reference node is proximate to and electrically isolated from the head of the arc welding apparatus; wherein the first feedback circuit is configured to determine the head voltage as a difference between the noise of the first reference wire and the head voltage and noise of the first measurement wire. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An arc welding apparatus, comprising:
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an arc welding head; a boom to support the head; a column to support the boom; a power supply to provide a voltage between the head and a workpiece; a first feedback circuit configured to provide a head voltage to the power supply; a first measurement wire coupled to the head and to a first input of the feedback circuit to provide the head voltage and noise induced on the first measurement wire to the feedback circuit; and a first reference wire coupled to a first reference node of the arc welding apparatus and to a second input of the first feedback circuit to provide noise induced on the first reference wire to the feedback circuit, wherein the first reference node is proximate to and electrically isolated from the head; wherein the first feedback circuit is configured to determine the head voltage as a difference between the noise of the first reference wire and the head voltage and noise of the first measurement wire. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method, comprising:
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inverting noise induced in a reference wire, wherein the reference wire is coupled to a node proximate to and electrically isolated from a head of an arc welding apparatus, and wherein a path of the reference wire is adjacent to a path of a head voltage measurement wire of the arc welding apparatus; summing the inverted noise with a head voltage received over a measurement wire, and with noise induced on the measurement wire, to provide a noiseless head voltage; and controlling a power supply of the arc welding apparatus based on the noiseless head voltage. - View Dependent Claims (18, 19, 20)
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Specification