Inverter energy storage welding transformer degaussing device

Abstract

The utility model discloses a degaussing device for an inverter energy storage welding transformer. The degaussing device comprises a DC24V power supply, a current-limiting resistor R, an IGBT switch tube V5, an isolating diode VD and a contactor KM, one end of the DC24V power supply is connected with the current-limiting resistor R, one end of the current-limiting resistor R is connected with the IGBT switch tube V5, one end of the IGBT switch tube V5 is connected with the isolating diode VD, one end of the isolating diode VD is connected with the contactor KM, one end of the contactor KM is connected with the welding transformer, and the other opposite end of the DC24V power supply is connected with the welding transformer. According to the circuit, the welding transformer can be demagnetized in a welding gap, so that the welding transformer cannot be magnetized and saturated; the transformer degaussing circuit is additionally arranged on the inverter energy storage welding machine, so that the welding transformer can be degaussed automatically, manual operation is not needed, and the problem of magnetization of the welding transformer during single-direction discharging is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of demagnetization of energy storage welding transformers, in particular to a demagnetization device for an inverter energy storage welding transformer. Background Art

[0002] When the inverter energy storage welding machine discharges in one direction for a long time, the iron core of the welding transformer will be magnetized. After the iron core of the welding transformer is magnetized, the output welding current will become smaller, causing the transformer to be magnetically saturated and the welding machine cannot be used normally. This circuit can demagnetize the welding transformer during the welding gap, so that the welding transformer will not be magnetized or saturated.

[0003] The inverter energy storage welding machine uses 4 IGBTs to conduct in turn according to the rules, and discharge the welding transformer in the forward and reverse directions. One welding is the forward discharge ( Figure 1 ), the next welding is reverse discharge ( Figure 2 ) to achieve the magnetic balance of the transformer. This method can only be applied to occasions where the workpieces are of the same material and thickness. When the workpieces to be welded are of two different materials or have different thicknesses, if the forward and reverse discharge method is still used, the welding quality will be unstable. This is because the heat generated by forward discharge and reverse discharge for workpieces of different materials or thicknesses is slightly different, and the welding may be normal during forward discharge, but poor during reverse discharge. This requires that the direction of the current cannot be changed each time welding, and only unidirectional discharge can be used.

[0004] In order to solve the problem of magnetization of welding transformers caused by unidirectional discharge, the most common method is to manually exchange the connection of the primary winding of the welding transformer regularly. First, connect the transformer to forward discharge, and then connect it to reverse discharge after a period of use according to the welding frequency. After a period of use, change it to forward discharge again, and repeat this process. Although this method can solve the problem of magnetization of welding transformers, it brings great instability to users.

[0005] Existing. Utility Model Content

[0006] In view of the problems existing in the existing inverter energy storage welding transformer demagnetization device, the utility model is proposed.

[0007] Therefore, the purpose of the utility model is to provide an inverter energy storage welding transformer demagnetization device to solve the problem.

[0008] In order to solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0009] An inverter energy storage welding transformer demagnetization device, comprising a DC24V power supply, a current limiting resistor R, an IGBT switch tube V5, an isolation diode VD and a contactor KM;

[0010] One end of the DC24V power supply is connected to a current limiting resistor R, one end of the current limiting resistor R is connected to an IGBT switch tube V5, one end of the IGBT switch tube V5 is connected to an isolation diode VD, one end of the isolation diode VD is connected to a contactor KM, one end of the contactor KM is connected to a welding transformer, and the other end of the DC24V power supply is connected to the welding transformer.

[0011] As a preferred solution of the inverter energy storage welding transformer demagnetization device described in the utility model, it also includes a voltage sampling circuit, one end of the voltage sampling circuit is connected to the DC24V power supply, and the other end of the voltage sampling circuit is connected to the contactor KM.

[0012] As a preferred solution of the inverter energy storage welding transformer degaussing device described in the utility model, wherein: the voltage sampling circuit is electrically connected to the CPU.

[0013] Compared with existing technologies:

[0014] 1. This circuit can demagnetize the welding transformer during the welding gap, so that the welding transformer will not be magnetized or saturated;

[0015] 2. A transformer demagnetization circuit is added to the inverter energy storage welding machine, so that the welding transformer can be demagnetized automatically without manual operation, solving the magnetization problem of the welding transformer during unidirectional discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A forward discharge diagram provided by the utility model;

[0017] Figure 2 A reverse discharge diagram provided by the utility model;

[0018] Figure 3 This is the automatic demagnetization circuit diagram of the inverter energy storage welding machine provided by the utility model;

[0019] Figure 4 This is a working principle diagram of the automatic degaussing circuit provided by the utility model. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clear, the implementation methods of the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] The utility model provides a degaussing device for inverter energy storage welding transformer. Figure 1-4 , including DC24V power supply, current limiting resistor R, IGBT switch tube V5, isolation diode VD and contactor KM;

[0022] One end of the DC24V power supply is connected to a current limiting resistor R, one end of the current limiting resistor R is connected to an IGBT switch tube V5, one end of the IGBT switch tube V5 is connected to an isolation diode VD, one end of the isolation diode VD is connected to a contactor KM, one end of the contactor KM is connected to a welding transformer, and the other end of the DC24V power supply is connected to the welding transformer.

[0023] It also includes a voltage sampling circuit, one end of which is connected to a DC24V power supply, the other end of which is connected to a contactor KM, and the voltage sampling circuit is electrically connected to a CPU.

[0024] The working principle is:

[0025] Forward and reverse discharge: During forward and reverse discharge, the welding transformer does not need to be demagnetized separately. KM is controlled by the CPU and is in the disconnected state, cutting off the automatic demagnetization circuit.

[0026] Unidirectional discharge: When the inverter energy storage welding machine controller works in unidirectional discharge, KM is controlled by the CPU to be in a closed state, V5 is in a cut-off state, and the IGBT switch tubes V2 and V3 of the inverter circuit are always in a cut-off state, and the welding is controlled by V1 and V4. When V1 and V4 are turned on, the welding current is Figure 4 The current flows in the direction of the solid arrow. Since V5 is cut off, the degaussing circuit is in the disconnected state, and the welding current does not pass through the degaussing circuit. While V1 and V4 are turned on, the CPU samples the voltage at both ends of the welding transformer at a frequency of 100us. After welding is completed, V1 and V4 are turned off, and the voltage sampling ends. The CPU accumulates the sampled voltage values, multiplies the result by the welding time, and obtains the product of voltage and time;

[0027] Demagnetization: After welding is completed, V1, V2, V3, and V4 are all in the cut-off state, and the CPU controls V5 to be turned on. The DC24V power supply provides a reverse voltage to the welding transformer through the current limiting resistor R and the isolation diode VD. At the same time, the CPU also samples the voltage at both ends of the welding transformer at a frequency of 100us, multiplies the voltage value sampled each time by the sampling number and the sampling time, and compares the result with the product of the voltage and time obtained during welding. If the former is lower than the latter, V5 continues to be turned on, otherwise V5 is cut off and demagnetization is completed;

[0028] Degaussing is automatically performed after welding is completed and in the interval between workpiece changes. The degaussing time is related to the degaussing voltage, welding time and welding voltage. The degaussing voltage is fixed at 24V. The welding time of the inverter energy storage welding machine is generally 10-20ms. Calculated at the highest voltage of 800V, the longest degaussing time will not exceed 1 second, which will not affect the normal welding rhythm.

[0029] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A degaussing device for an inverter energy storage welding transformer, characterized in that: It includes a DC24V power supply, a current limiting resistor R, an IGBT switch tube V5, an isolation diode VD and a contactor KM; One end of the DC24V power supply is connected to a current limiting resistor R, one end of the current limiting resistor R is connected to an IGBT switch tube V5, one end of the IGBT switch tube V5 is connected to an isolation diode VD, one end of the isolation diode VD is connected to a contactor KM, one end of the contactor KM is connected to a welding transformer, and the other end of the DC24V power supply is connected to the welding transformer.

2. The degaussing device for inverter energy storage welding transformer according to claim 1 is characterized in that: It also includes a voltage sampling circuit, one end of which is connected to a DC24V power supply, and the other end of which is connected to a contactor KM.

3. The degaussing device for inverter energy storage welding transformer according to claim 2 is characterized in that: The voltage sampling circuit is electrically connected to the CPU.

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