Circuit for detecting welding current and transferred arc current of plasma cutting machine

Abstract

The invention discloses a circuit for detecting welding current and transferred arc current of a plasma cutting machine. The circuit is used for a plasma cutting machine utilizing transferred arc cutting, the plasma cutting machine is connected with a power supply circuit, the power supply circuit converts and rectifies alternating current signals of an alternating current power supply into working voltage and frequency required by the plasma cutting machine, and the power supply circuit comprises a load circuit connected with the power supply circuit; and a current sensor arranged in the loadcircuit. The total output current of the plasma cutting machine can be detected through one Hall current sensor, the cutting current can also be detected, the Hall current sensor is ingeniously used,the structure is ingenious, and the cost is greatly reduced; and meanwhile, the control method does not increase any complexity, and has remarkable economic benefits.

Description

technical field [0001] The invention relates to a control circuit of a plasma cutting machine, in particular to a circuit for detecting welding current and transfer arc current of a plasma cutting machine. Background technique [0002] In the prior art, for a plasma cutting machine with a transferred arc, in order to detect its welding current and transferred arc current, two Hall current sensors are generally connected to the positive or negative pole of the welder output, and one of the Hall current sensors The sensor is used to detect the total output current of the cutting machine (including the current of the transfer arc branch), and another Hall current sensor is used to detect the current from the cutting machine to the workpiece. Although this technical solution is simple to control, it needs to The use of two-way Hall current sensors is expensive and has poor economic benefits. Contents of the invention [0003] According to an embodiment of the present inventio...

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Problems solved by technology

[0002] In the prior art, for a plasma cutting machine with a transferred arc, in order to detect its welding current and transferred arc current, two Hall current sensors are generally connected to the positive or negative pole of the welder output, and one of the Hall current sensors The sensor is used to detect the total output current of the cutting machine (including the current of the transfer arc branch), and another Hall current sensor is used to detect the current from the cutting machine to the workpiece. Although this technical solution is simple to control, it needs to Using two Hall current sensors, the cost is high and the economic benefit is poor

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