A multifunctional high frequency transformer control device and method

Abstract

The present invention discloses a multifunctional high-frequency transformer control device and method, including a high-frequency transformer and a rectifier filter circuit; the high-frequency transformer includes a primary winding and a secondary winding, wherein the secondary winding of the high-frequency transformer is provided with a lead-out terminal, the lead-out terminal is connected to the input end of the rectifier filter circuit, the rectifier filter circuit includes a first rectifier diode, a second rectifier diode, a third rectifier diode and a fourth rectifier diode connected in parallel, and the output end of the rectifier filter circuit is connected with a cutting positive terminal, a welding positive terminal and a common negative terminal. The present invention adopts a unique high-frequency transformer winding design, a primary winding set and a secondary winding series boost winding method, and cooperates with a set of control loops to achieve a high degree of integration of cutting and welding functions.

Description

Technical Field

[0001] The invention relates to the technical field of welding and cutting, and in particular to a multifunctional high-frequency transformer control device and method. Background Art

[0002] High-frequency transformer is an important power electronic device, whose main function is to realize the conversion and transmission of electric energy. Through the principle of electromagnetic induction, it transforms the input electric energy between different voltage and current levels to meet the needs of various power electronic devices. In the field of welding and cutting technology, welding equipment and cutting equipment are two common power electronic devices, which are used for cutting and welding materials respectively and are widely used in industrial production.

[0003] At present, cutting power and welding power in industrial applications are mostly separate devices, each realizing a single function. In some prior arts that attempt to integrate cutting and welding functions, for example, the invention patent application No. 200410021062.7 discloses a power supply device in a multifunctional integrated welding and cutting device, which provides cutting power and welding power by switching. However, although the function switching is realized in a set of power supply devices, a mechanical switch switching method is adopted. This method requires manual intervention, which not only increases the cost of the equipment, but also has high uncontrollability and complexity of manual operation. When the operator switches the function, the equipment may be damaged or a safety accident may occur due to improper operation. At the same time, frequent mechanical switching actions will also reduce the service life of the equipment. In addition, the prior art switches the cutting and welding functions by controlling the contacts of the mechanical equipment, which limits the output current capacity. Due to the limited contact resistance and current carrying capacity of the mechanical contacts, it cannot meet the needs of high-power equipment products. Mechanical contact switching causes a large contact resistance of the high-frequency transformer control circuit. When the current passes through the contact resistance, a large amount of heat will be generated. This part of the energy is wasted in the form of heat loss, which reduces the overall efficiency of the equipment. Low efficiency not only increases energy consumption and production costs, but may also cause equipment overheating, affect equipment stability and reliability, and further shorten the service life of the equipment. In addition, the cutting and welding function outputs in the prior art use the same output terminal, which may cause voltage abnormalities due to misoperation or equipment failure when switching functions, increasing safety risks. In addition, the no-load voltage during the cutting function is as high as 210V, which far exceeds the safety voltage for the human body and is very likely to cause electric shock accidents. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a multifunctional high-frequency transformer control device and method. In the present invention, the primary side of the high-frequency transformer adopts a set of windings, and the secondary winding of the high-frequency transformer is a welding function winding and a cutting function winding wound in series with boost, which can realize fully automatic adaptation to welding and cutting functions.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a multifunctional high-frequency transformer control device, comprising: a high-frequency transformer and a rectifier filter circuit;

[0007] The high-frequency transformer includes a primary winding and a secondary winding, wherein a lead terminal is provided on the secondary winding of the high-frequency transformer, and the lead terminal is connected to the input end of the rectifier and filter circuit. The rectifier and filter circuit includes a first rectifier diode, a second rectifier diode, a third rectifier diode and a fourth rectifier diode connected in parallel, and the output end of the rectifier and filter circuit is connected to a cut positive terminal, a welded positive terminal and a common negative terminal.

[0008] As a further technical solution, one primary winding of the high-frequency transformer is provided, and the secondary winding of the high-frequency transformer includes a welding functional winding and a cutting functional winding, and the welding functional winding and the cutting functional winding are connected in series with boost winding.

[0009] As a further technical solution, the secondary winding is provided with lead terminals, specifically: the welding function winding and the cutting function winding are both provided with lead terminals, wherein the welding function winding is provided with a first welding lead terminal and a second welding lead terminal; the cutting function winding is provided with a first cutting lead terminal and a second cutting lead terminal.

[0010] As a further technical solution, the first welding lead-out terminal and the second welding lead-out terminal are respectively connected to the anodes of the first rectifier diode and the second rectifier diode in the rectifier and filter circuit.

[0011] As a further technical solution, the cathodes of the first rectifier diode and the second rectifier diode are connected to each other, and after being connected, they are connected to the welding positive terminal and the common negative terminal.

[0012] As a further technical solution, the first cutting lead-out terminal and the second cutting lead-out terminal are respectively connected to the anodes of the third rectifier diode and the fourth rectifier diode in the rectifier and filter circuit, and the cathodes of the third rectifier diode and the fourth rectifier diode are connected to the cutting positive terminal and the common negative terminal.

[0013] As a further technical solution, a first inductor is connected between the first cut lead-out terminal and the third rectifier diode. Specifically, the first cut lead-out terminal is connected to one end of the first inductor, and the other end of the first inductor is connected to the anode of the third rectifier diode.

[0014] As a further technical solution, a second inductor is connected between the second cut lead-out terminal and the fourth rectifier diode. Specifically, the second cut lead-out terminal is connected to one end of the second inductor, and the other end of the second inductor is connected to the anode of the fourth rectifier diode.

[0015] As a further technical solution, the cut positive terminal, the welded positive terminal and the common negative terminal are all coated with an insulating coating to prevent people from getting electric shock.

[0016] In a second aspect, the present invention provides a multifunctional high-frequency transformer control method, based on a multifunctional high-frequency transformer control device described in any one of the first aspects, comprising: the primary winding of the high-frequency transformer continuously receives alternating current, and when a welding operation is performed, the welding function winding in the secondary winding of the high-frequency transformer starts working, and the alternating current is output from the first welding lead-out terminal and the second welding lead-out terminal, respectively entering the first rectifier diode and the second rectifier diode in the rectifying and filtering circuit for full-wave rectification, and then connecting the welding positive terminal and the common negative terminal to output a DC welding current; when a cutting operation is performed, the cutting function winding in the secondary winding of the high-frequency transformer starts working, and the alternating current is output from the first cutting lead-out terminal and the second cutting lead-out terminal, respectively passing through the first inductor and the second inductor, and then entering the third rectifier diode and the fourth rectifier diode in the rectifying and filtering circuit for full-wave rectification, and then connecting the cutting positive terminal and the common negative terminal to output a DC cutting current.

[0017] One or more technical solutions of the present invention have the following beneficial effects:

[0018] (1) The present invention adopts a unique high-frequency transformer winding design, a primary winding and a secondary winding in series boost winding, and a control circuit to achieve a high degree of integration of cutting and welding functions. The equipment can automatically adapt to welding and cutting functions according to input signals or preset programs without manual switching (mechanical switch switching). This not only greatly reduces the cost of the equipment and reduces the cost increase caused by additional components such as mechanical switches, but also eliminates the uncontrollability and complexity of manual operation, and improves the intelligence and ease of operation of the equipment. The operator only needs to simply set the working mode, and the equipment can automatically adjust to the corresponding welding or cutting state, effectively improving work efficiency and reducing equipment failures and safety accidents caused by operating errors.

[0019] (2) The primary winding and the secondary winding are connected in series in a boosted winding manner, and are respectively connected to the cutting positive terminal, the welding positive terminal and the common negative terminal. The non-conversion contact switch technology is realized through a special control method, overcoming the limitation of the traditional mechanical contact on the output current. The present invention can achieve a current output of a maximum power of 400A and above, and the current is steplessly adjustable. This high-power output meets the high-power demand for cutting and welding equipment in modern industrial production. At the same time, the cutting and welding function outputs in the present invention use two completely separated sets of output terminals, which are coated with an insulating coating to ensure the personal safety of on-site operators, avoid voltage abnormalities due to incorrect operations, and reduce safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0021] Figure 1 This is a control circuit diagram of a high-frequency transformer of the present invention; DETAILED DESCRIPTION

[0022] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0023] Embodiment 1

[0024] The present invention provides a multifunctional high-frequency transformer control device, such as Figure 1 As shown, the multifunctional high-frequency transformer control device includes a high-frequency transformer and a rectifier filter circuit, wherein the high-frequency transformer includes a primary winding and a secondary winding. In this embodiment, the primary winding of the high-frequency transformer is provided with one. Figure 1 5 and 6 are two input terminals of the primary winding, which ensures that there is no need to switch functions. The secondary winding of the high-frequency transformer is provided with a lead terminal. Specifically, the secondary winding of the high-frequency transformer includes a welding function winding and a cutting function winding, and the welding function winding and the cutting function winding are connected in series with a boost winding method, wherein the welding function winding and the cutting function winding are both provided with lead terminals, and the welding function winding is provided with a first welding lead terminal ( Figure 1 1) and the second welding lead terminal ( Figure 1 In addition, there is a first internal connection terminal in the welding function winding, which is Figure 1 2 and 3, first weld the lead terminals ( Figure 1 1) and the second welding lead terminal ( Figure 14) and the two first internal connection terminals together form an electromagnetic circuit of the welding functional winding; the cutting functional winding is provided with a first cutting lead terminal ( Figure 1 7) and the second cut lead terminal ( Figure 1 9), in addition, there is a second internal connection terminal in the cutting function winding, which is Figure 1 8 and 10, first cut the lead terminal ( Figure 1 7) and the second cut lead terminal ( Figure 1 9) and the two second internal connection terminals together form an electromagnetic circuit of the cutting functional winding. In this embodiment, the first welding lead terminal ( Figure 1 1), a second internal connection terminal ( Figure 1 8) and the second welding lead terminal ( Figure 1 4), another second internal connection terminal ( Figure 1 10) The connection of opposite ends can avoid interference between cutting and welding operations, ensuring the safety of operators. A set of high-frequency transformers can realize cutting and welding multi-functions. Through optimized winding design and control strategy, the equipment efficiency is as high as over 92%, and the power factor is over 0.9. Efficient energy conversion reduces energy waste, reduces the energy consumption and operating costs of enterprises. In the current environment of advocating energy conservation and emission reduction, the present invention meets the energy efficiency standards of high efficiency, energy conservation and emission reduction, helps enterprises reduce carbon emissions and achieve sustainable development, and also contributes to easing energy tensions.

[0025] In this embodiment, the rectifier and filter circuit includes a first rectifier diode RB1, a second rectifier diode RB2, a third rectifier diode RB3, and a fourth rectifier diode RB4 connected in parallel, and the lead-out terminal on the secondary winding is connected to the input end of the rectifier and filter circuit, and the output end of the rectifier and filter circuit is connected to a cutting positive terminal (inverter 1+ in the figure), a welding positive terminal (inverter 2+ in the figure) and a common negative terminal (inverter- in the figure). The cutting and welding function outputs use two completely separated sets of output terminals (cutting positive terminal, common negative terminal and welding positive terminal, common negative terminal), so as to avoid the situation that the voltage is abnormal due to misoperation or equipment failure when switching functions due to the use of the same output terminal for the cutting and welding function outputs. In this embodiment, the cutting positive terminal, the welding positive terminal and the common negative terminal are all coated with an insulating coating to prevent electric shock to personnel, ensure the personal safety of on-site operators, avoid voltage abnormality due to misoperation, and reduce safety risks.

[0026] Specific: such as Figure 1 As shown, the first welding lead terminal ( Figure 1 1) and the second welding lead terminal ( Figure 14) are respectively connected to the anodes of the first rectifier diode RB1 and the second rectifier diode RB2 in the rectifier filter circuit, and the cathodes of the first rectifier diode RB1 and the second rectifier diode RB2 are connected, and after being connected, they are connected to the welding positive terminal (inverter 2+ in the figure) and the common negative terminal (inverter-); the first cutting lead terminal ( Figure 1 7) and the second cut lead terminal ( Figure 1 9) are respectively connected to the anodes of the third rectifier diode RB3 and the fourth rectifier diode RB4 in the rectifier filter circuit, and the cathodes of the third rectifier diode RB3 and the fourth rectifier diode RB4 are connected to the cut positive terminal (inverter 1+ in the figure) and the common negative terminal (inverter - in the figure). Among them, a first inductor is connected between the first cut lead-out terminal and the third rectifier diode, specifically: the first cut lead-out terminal is connected to one end of the first inductor, and the other end of the first inductor is connected to the anode of the third rectifier diode; a second inductor is connected between the second cut lead-out terminal and the fourth rectifier diode, specifically: the second cut lead-out terminal is connected to one end of the second inductor, and the other end of the second inductor is connected to the anode of the fourth rectifier diode.

[0027] Embodiment 2

[0028] This embodiment provides a multifunctional high-frequency transformer control method, based on a multifunctional high-frequency transformer control device provided in Embodiment 1, including:

[0029] The primary winding of the high-frequency transformer continuously receives alternating current. When welding operation is performed, the welding function winding in the secondary winding of the high-frequency transformer starts working, and the alternating current is output from the first welding lead-out terminal and the second welding lead-out terminal and enters the first rectifier diode and the second rectifier diode in the rectifying and filtering circuit for full-wave rectification respectively, and then connects the welding positive terminal and the common negative terminal to output a direct current welding current; when cutting operation is performed, the cutting function winding in the secondary winding of the high-frequency transformer starts working, and the alternating current is output from the first cutting lead-out terminal and the second cutting lead-out terminal and enters the third rectifier diode and the fourth rectifier diode in the rectifying and filtering circuit for full-wave rectification respectively after passing through the first inductor and the second inductor, and then connects the cutting positive terminal and the common negative terminal to output a direct current cutting current.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multifunctional high-frequency transformer control device, characterized in that: include: High frequency transformer and rectifier filter circuit; The high-frequency transformer includes a primary winding and a secondary winding, wherein a lead terminal is provided on the secondary winding of the high-frequency transformer, and the lead terminal is connected to the input end of the rectifier and filter circuit. The rectifier and filter circuit includes a first rectifier diode, a second rectifier diode, a third rectifier diode and a fourth rectifier diode connected in parallel, and the output end of the rectifier and filter circuit is connected to a cut positive terminal, a welded positive terminal and a common negative terminal.

2. A multifunctional high-frequency transformer control device as claimed in claim 1, characterized in that: One primary winding of the high-frequency transformer is provided, and the secondary winding of the high-frequency transformer includes a welding functional winding and a cutting functional winding, and the welding functional winding and the cutting functional winding are connected in series and wound in a boosting manner.

3. A multifunctional high-frequency transformer control device as claimed in claim 2, characterized in that: The secondary winding is provided with lead terminals, specifically: the welding function winding and the cutting function winding are both provided with lead terminals, wherein the welding function winding is provided with a first welding lead terminal and a second welding lead terminal; the cutting function winding is provided with a first cutting lead terminal and a second cutting lead terminal.

4. A multifunctional high-frequency transformer control device as claimed in claim 3, characterized in that: The first welding lead-out terminal and the second welding lead-out terminal are respectively connected to anodes of a first rectifier diode and a second rectifier diode in the rectifier and filter circuit.

5. A multifunctional high-frequency transformer control device as claimed in claim 4, characterized in that: The cathodes of the first rectifier diode and the second rectifier diode are connected to each other, and after being connected, are connected to the welding positive terminal and the common negative terminal.

6. A multifunctional high-frequency transformer control device as claimed in claim 3, characterized in that: The first cutting lead-out terminal and the second cutting lead-out terminal are respectively connected to the anodes of the third and fourth rectifying diodes in the rectifying and filtering circuit, and the cathodes of the third and fourth rectifying diodes are connected to the cutting positive terminal and the common negative terminal.

7. A multifunctional high-frequency transformer control device as claimed in claim 6, characterized in that: A first inductor is connected between the first cut lead-out terminal and the third rectifier diode. Specifically, the first cut lead-out terminal is connected to one end of the first inductor, and the other end of the first inductor is connected to the anode of the third rectifier diode.

8. A multifunctional high-frequency transformer control device as claimed in claim 6, characterized in that: A second inductor is connected between the second cut lead-out terminal and the fourth rectifier diode. Specifically, the second cut lead-out terminal is connected to one end of the second inductor, and the other end of the second inductor is connected to the anode of the fourth rectifier diode.

9. A multifunctional high-frequency transformer control device as claimed in claim 1, characterized in that: The cut positive terminal, the welded positive terminal and the common negative terminal are all coated with an insulating coating to prevent people from getting electric shock.

10. A multifunctional high-frequency transformer control method, based on a multifunctional high-frequency transformer control device according to any one of claims 1 to 9, characterized in that: include: The primary winding of the high-frequency transformer continuously receives alternating current. When a welding operation is performed, the welding function winding in the secondary winding of the high-frequency transformer starts working, and the alternating current is output from the first welding lead-out terminal and the second welding lead-out terminal, respectively entering the first rectifier diode and the second rectifier diode in the rectifying and filtering circuit for full-wave rectification, and then connecting the welding positive terminal and the common negative terminal to output a direct current welding current; when a cutting operation is performed, the cutting function winding in the secondary winding of the high-frequency transformer starts working, and the alternating current is output from the first cutting lead-out terminal and the second cutting lead-out terminal, respectively passing through the first inductor and the second inductor, and then entering the third rectifier diode and the fourth rectifier diode in the rectifying and filtering circuit for full-wave rectification, and then connecting the cutting positive terminal and the common negative terminal to output a direct current cutting current.

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