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Device for monitoring positive and negative half-wave asymmetry of primary current of transformer in resistance welding machine

A primary current, resistance welding machine technology, used in welding monitoring devices, welding power sources, etc., can solve the problems of transformer damage, positive and negative half-wave asymmetry, etc., to achieve the effect of convenient automatic industrial production

Inactive Publication Date: 2012-12-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the transformer is damaged due to the conduction asymmetry of the bidirectional thyristor switch in the main circuit of the existing resistance welding machine, and to provide a method for monitoring the positive and negative half-wave asymmetry of the primary side current of the resistance welding machine transformer. degree device

Method used

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  • Device for monitoring positive and negative half-wave asymmetry of primary current of transformer in resistance welding machine
  • Device for monitoring positive and negative half-wave asymmetry of primary current of transformer in resistance welding machine
  • Device for monitoring positive and negative half-wave asymmetry of primary current of transformer in resistance welding machine

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specific Embodiment approach 1

[0016] Specific implementation mode one: the following combination figure 1 This embodiment is described. This embodiment is composed of a voltage signal full-wave rectification circuit 1, a current signal full-wave rectification circuit 2, a conduction angle and firing angle measurement circuit 3, an asymmetry calculation module 4 and a current sensor 5.

[0017] The voltage signal full-wave rectification circuit 1 is used for full-wave rectification of the voltage signal on the primary side of the transformer, the voltage signal output end of the voltage signal full-wave rectification circuit 1 is connected to the voltage signal input end of the conduction angle and firing angle measurement circuit 3,

[0018] The current signal full-wave rectification circuit 2 is used for full-wave rectification of the current signal on the primary side of the transformer, and the current signal output terminal of the current signal full-wave rectification circuit 2 is connected to the curr...

specific Embodiment approach 2

[0021] Specific implementation mode two: the following combination figure 1 with figure 2 Describe this embodiment, this embodiment is a further description of Embodiment 1, the circuit structure of the voltage signal full-wave rectification circuit 1 is: between the voltage input signal end of the primary side of the transformer and the non-inverting input end of the A-amplifier U1A A-resistor RA1, A-capacitor CA2, and A-resistor RA2 are connected in series in series. One end of A-capacitor CA1 is connected between A-resistor RA1 and A-capacitor CA2, and the other end of A-capacitor CA1 is connected to the primary side of the transformer at the same time. The other end of the voltage input signal and the ground of the analog power supply, one end of the A three-resistor RA3 is connected to the non-inverting input end of the A-amplifier U1A, the other end of the A-three resistor RA3 is connected to the analog power ground, and the non-inverting input end of the A-amplifier U1...

specific Embodiment approach 3

[0027] Specific implementation mode three: the following combination figure 1 with image 3 Describe this embodiment, this embodiment is a further description of Embodiment 1, the circuit structure of the current signal full-wave rectification circuit 2 is: between the current input signal end of the primary side of the transformer and the non-inverting input end of the D-amplifier U1D Connect B-two resistor RB2 and B-three resistor RB3 in series in series. The current input signal end of the primary side of the transformer is connected to one end of B-resistor RB1, the other end of B-resistor RB1 is connected to the analog power ground, and the cathode of B-diode DB1 is connected to B Between the second resistor RB2 and the B3 resistor RB3, the anode of the B1 diode DB1 is connected to the -15V power supply, the anode of the B2 diode DB2 is connected between the B2 resistor RB2 and the B3 resistor RB3, and the cathode of the B2 diode DB2 is connected to + 15V power supply, t...

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Abstract

The invention relates to a device for monitoring the positive and negative half-wave asymmetry of primary current of a transformer in a resistance welding machine, belongs to the field of monitoring of transformers, and solves the problem that the transformer is damaged due to the conduction asymmetry of a bidirectional silicon-controlled switch in a main circuit of the conventional resistance welding machine. The device consists of a voltage signal full-wave rectifying circuit, a current signal full-wave rectifying circuit, a conduction angle and trigger angle measuring circuit, an asymmetry calculation module and a current sensor, wherein the current sensor is used for acquiring a current signal output by the current signal output end of the current signal full-wave rectifying circuit; the sampling output end of the current sensor is connected with the current signal input end of the asymmetry calculation module; and the asymmetry calculation module calculates the positive and negative half-wave asymmetry of the primary current of the transformer according to the input conduction angle signal, trigger angle signal and current signal. The device is suitable for monitoring the positive and negative half-wave asymmetry of the primary current of the transformer.

Description

technical field [0001] The invention relates to a device for monitoring the positive and negative half-wave asymmetry of the primary side current of a resistance welding machine transformer, which belongs to the field of transformer monitoring. Background technique [0002] The main circuit of the power frequency AC resistance welding machine used in the factory now uses bidirectional thyristor as the main power switch, and the resistance welding machine is used as the inductive load of the power supply system. Single-tube failure often occurs, for example, due to two controllable The conduction of silicon is asymmetrical, resulting in unexpected situations such as DC magnetization and even single-tube conduction, resulting in unstable welding quality, and serious damage to the transformer of the resistance welding machine. Contents of the invention [0003] The purpose of the present invention is to solve the problem that the transformer is damaged due to the conduction a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K11/25
Inventor 张忠典李冬青朱世良张鹏梅冬胜汤有良邱建明
Owner HARBIN INST OF TECH