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A detection method of arc-breaking fault detection circuit based on filter inductor voltage

A technology of fault detection circuit and filter inductance, which is applied in the field of fault detection of arc welding power supply, can solve the problems of complex structure and high cost of arc welding system, save time and cost for installation and debugging, low cost and simple implementation Effect

Active Publication Date: 2022-07-26
INST OF LASER & OPTOELECTRONICS INTELLIGENT MFG WENZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing arc breaking detection devices are either based on current detection sensor solutions or machine vision solutions, all of which will lead to complex structures and high costs for the arc welding system

Method used

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  • A detection method of arc-breaking fault detection circuit based on filter inductor voltage
  • A detection method of arc-breaking fault detection circuit based on filter inductor voltage
  • A detection method of arc-breaking fault detection circuit based on filter inductor voltage

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Embodiment 1

[0054] Embodiment 1, the present invention provides an arc-breaking fault detection circuit based on filter inductor voltage, which includes:

[0055] The absolute value circuit is connected to both ends of the inductance of the inverter arc welding power source, and the obtained inductance L f The filter inductor voltage u at both ends L (t) Perform an absolute value operation;

[0056] A signal conditioning circuit, connected to the absolute value circuit, operates on the voltage signal |u after the absolute value operation L (t)| to adjust the voltage amplitude;

[0057] The voltage detection circuit is connected to the output end of the signal conditioning circuit and is used to detect the output signal u of the signal conditioning circuit a (t) is it less than the threshold U thre , and output the logic signal u b ;

[0058] A timing circuit, which includes a start, stop / clear, reset and output terminal, the start, stop / clear terminal and the output logic signal u o...

Embodiment 2

[0068] Embodiment 2, the present invention also discloses an arc-breaking fault detection circuit based on filter inductor voltage, which includes:

[0069] The absolute value circuit is connected to both ends of the inductance of the inverter arc welding power source, and the obtained inductance L f The filter inductor voltage u at both ends L (t) Perform an absolute value operation;

[0070] Signal conditioning circuit, connected to the absolute value circuit, for |u L (t)| Perform level conversion to get u samp (t);

[0071] MCU, connected with signal conditioning circuit, sampling u through AD samp (t), and then obtain u L (t) information;

[0072] The drive circuit, connected with the MCU, realizes the isolation and drive amplification of PWM1 to PWM4 to obtain drive1 to drive4, and then controls the on-off control of S1 to S4.

[0073] Inverter arc welding power supply arc fault detection system such as Figure 5 As shown, it mainly includes a three-phase rectifi...

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Abstract

The invention relates to an arc-breaking fault detection circuit and a detection method based on filter inductor voltage. On the basis of analyzing in detail the working process of an inverter arc welding power source in the normal working state and the working process in the arc-breaking fault state, the arc welding process is obtained. There is a significant difference in the filter inductor voltage between the two operating states of the power supply. On this basis, the voltage data of the output filter inductance of the inverter arc welding power source is obtained in real time and analyzed, and then it is detected whether the arc welding power source is in an arc-off fault state. The invention does not need an arc-breaking sensor and an auxiliary circuit, and only needs to sample and output the voltage data of the filter inductance to realize the arc-breaking fault state detection of the inverter arc welding power supply, and saves the installation and debugging of the arc-breaking sensor and the auxiliary processing circuit. The cost makes the system structure simpler, the system cost is lower, and the security is higher.

Description

technical field [0001] The invention relates to an arc welding power source fault detection technology, in particular to an arc-breaking fault detection circuit and a detection method based on a filter inductor voltage. Background technique [0002] With the continuous in-depth research of human beings in the field of deep-sea exploration, strict requirements are put forward for the pressure resistance of various deep-sea equipment. The quality of welding processing is directly related to the performance and safety of deep diving equipment. As the core component of the welding processing system, high-performance welding equipment has received continuous attention from enterprises and scientific research institutions in the field of manufacturing equipment. Arc welding is widely used in shipbuilding, bridges, boilers, chemical equipment, lifting machinery and metallurgical machinery manufacturing because of its flexible operation and wide applicability of materials. It is th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/40
CPCG01R31/40
Inventor 余心舒彭志辉
Owner INST OF LASER & OPTOELECTRONICS INTELLIGENT MFG WENZHOU UNIV