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Analog switch circuit and secondary current detection system of inverter resistance welding machine

A technology for simulating switching circuits and resistors, applied in the field of welding current detection of inverter DC resistance welding machines, can solve problems such as uncontrollable integral capacitance, achieve the effect of improving measurement accuracy and ensuring stability

Active Publication Date: 2020-05-05
广州市精源电子设备有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide an analog switch circuit for the problem that the existing device cannot control the integral capacitor in the integral circuit to charge and discharge quickly to ensure the stability of the detection system

Method used

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  • Analog switch circuit and secondary current detection system of inverter resistance welding machine
  • Analog switch circuit and secondary current detection system of inverter resistance welding machine
  • Analog switch circuit and secondary current detection system of inverter resistance welding machine

Examples

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Effect test

application example 1

[0078] Taking the JYD-04AL intermediate frequency inverter resistance welding machine as a test prototype, the solution of the present invention is introduced in detail. The inverter frequency of the prototype is 4kHz, and the effective value of the rated output current is 4kA. The welding current waveform actually output by the prototype, that is, the current signal to be detected by the present invention is as follows: Figure 9 As shown, it can be seen from the figure that the measured object is a pulsating DC signal, and the pulsating frequency is 8kHz. This application example uses a flexible Rogowski coil with the following parameters for measurement: coil ratio 85mV / kA (50Hz), amplitude accuracy ±0.5% rdg (25°C), maximum response time 1μs, bandwidth 2Hz-100kHz. The original welding current of the prototype is input to the input end of the Rogowski coil in the secondary current detection system of the inverter resistance welding machine. Such as Figure 10 As shown, wh...

application example 2

[0080] The welding current is 2kA, the welding time is 2s, and the compensation effect is compared. Such as Figure 11 , wherein, 1, 2, and 3 in the figure refer to channel 1, channel 2 and channel 3 respectively; channel 1 represents the secondary current signal measured when uncompensated; channel 2 represents the secondary current detection using the inverter resistance welding machine of the present invention The secondary current signal measured by the system; Channel 3 represents the secondary current signal measured by the Hall current sensor. It can be seen that the waveform output without compensation has obvious integral drift in the integration time of nearly two seconds, and the waveform is seriously distorted. The waveform after compensation is consistent with the trend of the actual welding current waveform, and the compensation effect is remarkable.

application example 3

[0082] Test the linearity of the secondary current detection system of the inverter resistance welding machine in the present invention. Calibrate the current detection device when the current is 4.00kA, so that the effective value of its output voltage is 4V. Then test the current detection device when the actual welding current is 3.70kA, 3.40kA, 3.10kA, 2.80kA, 2.50kA, 2.20kA, 1.90kA, 1.60kA, 1.30kA, 1.00kA and 0.70kA, and the linearity of the measurement results Degree curve such as Figure 12 shown. The linearity of the measurement results is 1.004, meeting the measurement requirements.

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Abstract

The invention relates to analog switch circuit and a secondary current detection circuit for an inversion resistance welding machine. The analog switch circuit comprises a comparison circuit, a detection circuit, and an electronic switch circuit. The input end of the comparison circuit is connected with a Rogowski coil voltage signal output end, and the output end of the comparison circuit is connected with the input end of the detection circuit. The output end of the detection circuit is connected with the control end of the electronic switch circuit. The comparison circuit compares a Rogowski coil output voltage signal with a preset comparison voltage, and outputs a control signal to the detection circuit. The detection circuit transmits the control signal to the control end of the electronic switch circuit after detection processing of the control signal, and the electronic switch circuit controls a fixed integrating circuit and an adjustable integrating circuit to switch the working states according to the processed control signal, wherein the fixed integrating circuit and the adjustable integrating circuit are connected with the electronic switch circuit. The analog switch circuit can control the integrating circuits to switch the state between an integrating state and a non-integrating state, effectively reduces the time of an integrating capacitor in the integrating circuits in arriving at a saturation state, and guarantees the stability of a system.

Description

technical field [0001] The invention relates to the technical field of welding current detection of an inverter DC resistance welding machine, in particular to an analog switch circuit and a secondary current detection system of an inverter resistance welding machine. Background technique [0002] As a low-cost, high-production-efficiency welding method, resistance welding is widely used. The resistance welding machine is the core part of the resistance welding process, and the welding quality directly depends on the output parameter specification of the welding machine. The output characteristics of the inverter resistance welding machine are small voltage and high current, the output voltage is generally within 10V, and the output current ranges from several thousand amperes to hundreds of thousands of amperes. During the welding process, the constant current control method is often used to ensure the stability of the welding current during welding and obtain better weldi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/0422H03K17/042G01R15/18G01R17/00
CPCG01R15/181G01R17/00H03K17/04206H03K17/0422
Inventor 曹彪杨凯李刚黄增好
Owner 广州市精源电子设备有限公司
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