Transformer for ore carrier full bridge inverter arc welding power supply

Abstract

The utility model discloses a kind of ore carrier full-bridge inverter arc welding power supply transformer, comprising: power supply system, electronic power system, given feedback system and electronic control system;Electronic power system includes full-bridge inverter circuit, output rectifier and RLC circuit;Full-bridge inverter circuit includes four switching modules, first magnetic core inductance, direct-current blocking capacitor and transformer;The output end of any two switching modules is connected with the one end of magnetic core inductance and the one end of primary side of intermediate-frequency transformer respectively;The input end of remaining two switching modules is connected with the one end of magnetic core inductance and the one end of primary side of transformer respectively;The other end of first magnetic core inductance is connected with the one end of direct-current blocking capacitor, the other end of direct-current blocking capacitor is connected with the other end of primary side of intermediate-frequency transformer;Intermediate-frequency transformer secondary side is connected with the input end of output rectifier;The utility model avoids the problem that transformer saturation, switching tube overload caused by using high-power power supply transformer in shipbuilding process.

Description

Technical Field

[0001] This invention relates to the field of inverter technology, and in particular to a full-bridge inverter arc welding power transformer for ore carriers. Background Technology

[0002] In today's rapidly developing industrial landscape, welding technology, as one of the core processes in modern manufacturing, directly impacts the efficiency and quality of industrial production. With advancements in power electronics technology and high-frequency switching devices, research on arc welding power supplies is moving towards higher frequencies, higher efficiency, and higher power density. Among these, the transformer in a high-frequency arc welding inverter power supply is a core module, and its performance directly determines the power supply's stability, efficiency, and reliability. However, with continuously increasing industrial demands, the operating frequency and power density of welding power supplies need further improvement. This places higher requirements on the design of high-frequency transformers, particularly in areas such as material selection, heat dissipation optimization, and distributed parameter suppression, presenting significant challenges.

[0003] High-frequency transformers differ significantly from low-frequency transformers in their operating principles and material applications. Traditional low-frequency transformers typically use silicon steel sheet cores, which are relatively inexpensive but difficult to meet the demands of high-frequency operation. High-frequency transformers, on the other hand, mostly use ferrite or amorphous alloy cores, which, while adaptable to high-frequency operating environments, also suffer from high brittleness, high cost, and significant high-frequency losses. Furthermore, the trend towards higher frequencies leads to smaller transformers, but this also increases losses in the core and windings, resulting in increased heat generation. The smaller size further limits heat dissipation, placing higher demands on the thermal management of high-frequency transformers.

[0004] It is worth noting that while increasing the switching power supply frequency can improve power density, it also exacerbates the problem of transformer core saturation and makes the effects of parasitic parameters such as leakage inductance and distributed capacitance more significant. These factors not only reduce the stability and reliability of the power supply but also affect the actual service life of the high-frequency transformer and increase material costs. For example, in switching converters, leakage inductance can cause voltage spikes, threatening the safe operation of power devices; while distributed capacitance can lead to current spikes and increased switching losses, reducing overall efficiency. Therefore, optimizing the electromagnetic design of high-frequency transformers, suppressing distributed parameters, and improving heat dissipation efficiency have become key issues in the development of arc welding inverter power supplies.

[0005] Existing high-frequency arc welding inverters are mostly based on a full-bridge topology, combining PWM / PFM control technology to achieve efficient energy conversion through high-frequency switching power supplies and amorphous / ferrite core transformers. However, these designs still face bottlenecks such as high-frequency losses, core saturation, and heat dissipation difficulties when pursuing higher frequencies and power densities. Especially in high-power applications such as shipbuilding and heavy machinery, the reliability and efficiency of high-frequency transformers directly affect the overall equipment performance. For example, in the design and construction of a 5,000-ton bauxite ore carrier, the stability of the welding process and the energy efficiency of the power supply are crucial. The structural welding of the ore carrier involves a large amount of high-strength steel and thick plate materials, requiring the arc welding power supply to have high power output and excellent dynamic response capabilities. The miniaturization and high efficiency advantages of high-frequency inverters perfectly meet the lightweight and energy-saving requirements of shipbuilding. However, the core saturation, heat accumulation, and electromagnetic interference problems of existing high-frequency transformers under high-power conditions may affect welding quality and even jeopardize the long-term reliability of the ship structure.

[0006] Therefore, combining the optimized design of high-frequency transformers for full-bridge arc welding inverters with the engineering requirements of large ore carrier construction, there is an urgent need to explore new high-frequency magnetic core materials, improve winding structures to reduce leakage inductance and distributed capacitance, and develop efficient heat dissipation solutions to enhance the power supply's anti-interference capability in complex industrial environments (such as ship welding workshops). This interdisciplinary research can not only drive breakthroughs in arc welding power supply technology but also provide key technical support for the efficient and green manufacturing of large engineering equipment (such as ore carriers). Utility Model Content

[0007] This invention provides a full-bridge inverter arc welding power transformer for ore carriers to overcome the technical problem that in the construction and design of large ships, high power output is required. Increasing the frequency of the switching power supply to increase the power output can lead to transformer saturation, leakage inductance, and distributed capacitance, which affects the stability and reliability of the power supply, the actual use of the inverter power transformer, and consequently the welding quality and increased material consumption costs.

[0008] To achieve the above objectives, the technical solution of the present invention is as follows:

[0009] A full-bridge inverter arc welding power transformer for ore carriers includes: a power supply system, an electronic power system, a given feedback system, and an electronic control system;

[0010] The power supply system is used to convert external alternating current (AC) into direct current (DC); the electronic power system is used to invert the DC into AC, and then rectify it again to output low-voltage DC to the load and the given feedback system; the given feedback system is used to adjust the voltage / current value of the input low-voltage DC to a preset range; the electronic control system is used to dynamically control the inverter power of the electronic power system according to the adjusted voltage / current value.

[0011] The electronic power system includes a full-bridge inverter circuit, an output rectifier, and an RLC circuit. The output terminal of the full-bridge inverter circuit is connected to the input terminal of the output rectifier, and the output terminal of the output rectifier is connected to the input terminal of the RLC circuit.

[0012] The full-bridge inverter circuit is used to invert the input DC current into AC current and AC voltage. The output rectifier is used to convert the AC current and AC voltage back into DC current and DC voltage, and output them to the external load and RLC circuit. The RLC circuit is used to amplify the input DC current signal to realize arc detection.

[0013] The full-bridge inverter circuit includes four identical switching modules, a first magnetic core inductor L1, a DC blocking capacitor Cx, and an intermediate frequency transformer T;

[0014] The output terminals of any two switching modules are connected to one end of the first magnetic core inductor L1 and one end of the primary winding of the intermediate frequency transformer T, respectively; the input terminals of the other two switching modules are connected to one end of the first magnetic core inductor L1 and one end of the primary winding of the intermediate frequency transformer T, respectively; the other end of the first magnetic core inductor L1 is connected to one end of the DC blocking capacitor Cx, and the other end of the DC blocking capacitor Cx is connected to the other end of the primary winding of the intermediate frequency transformer T; the secondary winding of the intermediate frequency transformer T is connected to the input terminal of the output rectifier.

[0015] Furthermore, the i-th switching module includes a switching transistor VTi, a diode VDi, a capacitor Ci, and a resistor Ri; i = 1, 2, 3, 4;

[0016] The collector of the switching transistor VTi is connected to the negative terminal of the diode VDi and one end of the capacitor Ci. The emitter of the switching transistor VTi is connected to the positive terminal of the diode VDi and one end of the resistor Ri. The other end of the capacitor Ci is connected to the other end of the resistor Ri.

[0017] Furthermore, the emitters of any two switching transistors VTi are connected to one end of the first magnetic core inductor L1 and one end of the primary side of the intermediate frequency transformer T, respectively, to form the first switching circuit;

[0018] The collectors of the other two switching transistors VTi are connected to one end of the first magnetic core inductor L1 and one end of the primary side of the intermediate frequency transformer T, respectively, forming the second switching circuit.

[0019] In the first switching circuit, the emitter of the switching transistor VTi, which is connected to one end of the primary side of the intermediate frequency transformer T, is grounded; in the second switching circuit, the emitter of the switching transistor VTi, which is connected to one end of the first magnetic core inductor L1, is grounded.

[0020] Furthermore, the type of switching transistor is an insulated gate bipolar transistor.

[0021] Furthermore, the core material of the intermediate frequency transformer T is an amorphous core.

[0022] Furthermore, the electronic control system includes an electronic control circuit and a drive circuit, wherein the electronic control circuit is a PWM / PFM hybrid control circuit.

[0023] Furthermore, the power supply system includes an input rectifier and a filter, wherein the filter is an EMI filter.

[0024] Beneficial effects: This invention provides a full-bridge inverter arc welding power transformer for ore carriers. It adopts a symmetrical full-bridge structure, connecting identical switching modules on both sides of the intermediate frequency transformer to ensure balanced energy transmission in both positive and negative half-cycles, improving waveform symmetry and stability. The introduction of a DC blocking capacitor in series with the intermediate frequency transformer solves the problem of bias magnetization caused by voltage pulse imbalance in the full-bridge circuit. This avoids the problems of transformer saturation and switching tube overload that are easily caused by using high-power power transformers in shipbuilding, increases the service life of the switching tubes, and reduces material loss. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the principle of the full-bridge inverter arc welding power transformer for ore carriers according to the present invention.

[0027] Figure 2 This is a circuit diagram of the full-bridge inverter circuit in the full-bridge inverter arc welding power transformer for ore carriers of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] This embodiment provides a full-bridge inverter arc welding power supply transformer for ore carriers, such as... Figure 1 As shown, it includes: a power supply system, an electronic power system, a given feedback system, and an electronic control system;

[0030] The power supply system is used to convert external alternating current (AC) into direct current (DC); the electronic power system is used to invert the DC into AC, and then rectify it again to output low-voltage DC to the load and the given feedback system; the given feedback system is used to adjust the voltage / current value of the input low-voltage DC to a preset range; the electronic control system is used to dynamically control the inverter power of the electronic power system according to the adjusted voltage / current value.

[0031] The electronic power system includes a full-bridge inverter circuit, an output rectifier, and an RLC circuit. The output terminal of the full-bridge inverter circuit is connected to the input terminal of the output rectifier, and the output terminal of the output rectifier is connected to the input terminal of the RLC circuit.

[0032] The full-bridge inverter circuit is used to invert the input DC current into AC current and AC voltage. The output rectifier is used to convert the AC current and AC voltage back into DC current and DC voltage, and output them to the external load and RLC circuit. The RLC circuit is used to amplify the input DC current signal to realize arc detection.

[0033] The output terminal of the full-bridge inverter circuit is connected to the input terminal of the output rectifier, and the output terminal of the output rectifier is connected to the input terminal of the RLC circuit.

[0034] like Figure 2 As shown, the full-bridge inverter circuit includes four identical switching modules, a first magnetic core inductor L1, a DC blocking capacitor Cx, and an intermediate frequency transformer T;

[0035] The output terminals of any two switching modules are connected to one end of the first magnetic core inductor L1 and one end of the primary winding of the intermediate frequency transformer T, respectively; the input terminals of the other two switching modules are connected to one end of the first magnetic core inductor L1 and one end of the primary winding of the intermediate frequency transformer T, respectively; the other end of the first magnetic core inductor L1 is connected to one end of the DC blocking capacitor Cx, and the other end of the DC blocking capacitor Cx is connected to the other end of the primary winding of the intermediate frequency transformer T; the secondary winding of the intermediate frequency transformer T is connected to the input terminal of the output rectifier.

[0036] Specifically, the intermediate frequency transformer T operates at a primary voltage of 380V, a secondary voltage of 70V, a secondary current of 630A, and a frequency of 20kHz. The RLC includes a sensing resistor Rs, an inductor L, and a capacitor C. The output terminal of the output rectifier is connected to one end of the inductor L and one end of the sensing resistor Rs, respectively. The other end of the inductor L is connected to one end of the capacitor C. The other end of the resistor Rs is connected to the other end of the capacitor C. The other end of the capacitor C is connected to the external load.

[0037] The given feedback system includes a detection circuit, a given circuit, a comparator, and an operational amplifier. The detection circuit monitors the welding current and voltage output by the electronic power system and collects the real-time welding current and voltage values. It then transmits the collected welding current and voltage values ​​to the comparator, which compares the collected welding current and voltage values ​​with the preset welding parameters transmitted from the given circuit to the comparator. If the comparison result exceeds the preset value by a certain range, the electronic control system feeds back to the electronic power system, which then adjusts and corrects the welding current and voltage values ​​to bring the real-time welding current and voltage values ​​back to the preset values. If the current and voltage values ​​do not deviate from the preset welding current and voltage values, the system defaults to an allowed state and will continue to use the current welding current and voltage values.

[0038] The other end of the detection resistor Rs is connected to the input terminal of the detection circuit M. The output terminal of the detection circuit M and the output terminal of the given circuit are connected to the input terminal of the comparison unit. The output terminal of the comparator is connected to the input terminal of the operational amplifier.

[0039] This solution employs a symmetrical full-bridge structure, connecting identical switching modules on both sides of the intermediate frequency transformer T to ensure balanced energy transmission across the positive and negative half-cycles, improving waveform symmetry and stability. Under the drive signal of the control current, the 308V is converted to 20kHz AC. In the full-bridge circuit, due to factors such as energy consumption of electrical components under operating conditions and voltage drop caused by oversaturation of the switching transistors, the voltage pulses on the transformer in the two half-cycles are not completely consistent. This difference in voltage pulses leads to different magnetic fluxes, which gradually decrease in one direction. In other words, the full-bridge circuit cannot achieve a balanced state, resulting in electromagnetic bias to one side. If this situation cannot be improved, it can easily cause saturation of the high-frequency transformer, a surge in excitation current, and put enormous pressure on the power switching transistors, even causing damage. Therefore, this solution introduces a DC blocking capacitor connected in series with the intermediate frequency transformer to solve the magnetic bias problem caused by voltage pulse imbalance in the full-bridge circuit, avoiding transformer saturation, switching transistor overload, increasing the service life of the switching transistors, and reducing material consumption.

[0040] In a specific embodiment, such as Figure 2 As shown, the i-th switching module includes a switching transistor VTi, a diode VDi, a capacitor Ci, and a resistor Ri; i = 1, 2, 3, 4;

[0041] The collector of the switching transistor VTi is connected to the negative terminal of the diode VDi and one end of the capacitor Ci. The emitter of the switching transistor VTi is connected to the positive terminal of the diode VDi and one end of the resistor Ri. The other end of the capacitor Ci is connected to the other end of the resistor Ri.

[0042] In this solution, a switching module is formed by a switching transistor, a diode, a capacitor, and a resistor, which can achieve efficient energy conversion. Through the protection of the diode, the filtering and energy buffering functions of the capacitor, and the current limiting and oscillation suppression functions of the resistor, the reliability and stability of the circuit are improved, enabling the circuit to operate stably under various operating conditions.

[0043] In a specific embodiment, the emitters of any two switching transistors VTi are connected to one end of the first magnetic core inductor L1 and one end of the primary side of the intermediate frequency transformer T, respectively, to form a first switching circuit.

[0044] The collectors of the other two switching transistors VTi are connected to one end of the first magnetic core inductor L1 and one end of the primary side of the intermediate frequency transformer T, respectively, forming the second switching circuit.

[0045] In the first switching circuit, the emitter of the switching transistor VTi, which is connected to one end of the primary side of the intermediate frequency transformer T, is grounded; in the second switching circuit, the emitter of the switching transistor VTi, which is connected to one end of the first magnetic core inductor L1, is grounded.

[0046] Specifically, this solution includes a first switch module, a second switch module, a third switch module, and a fourth switch module. The first switch module includes a first switch transistor VT1, a first diode VD1, a first capacitor C1, and a first resistor R1; the second switch module includes a second switch transistor VT2, a second diode VD2, a second capacitor C2, and a second resistor R2; the third switch module includes a third switch transistor VT3, a third diode VD3, a third capacitor C3, and a third resistor R3; and the fourth switch module includes a fourth switch transistor VT4, a fourth diode VD4, a fourth capacitor C4, and a fourth resistor R4.

[0047] The emitter of the first switching transistor VT1 is connected to one end of the first magnetic core inductor L1, and the emitter of the fourth switching transistor VT4 is connected to one end of the primary side of the intermediate frequency transformer T; the other end of the fourth resistor R4 is grounded, and the first switching module and the fourth switching module form the first switching circuit.

[0048] The collector of the third switch transistor VT3 is connected to one end of the first magnetic core inductor L1, the collector of the second switch transistor VT2 is connected to one end of the primary side of the intermediate frequency transformer T, the emitter of the third switch transistor VT3 is grounded, and the emitter of the second switch transistor VT2 is connected to the output rectifier, forming the second switching circuit.

[0049] The emitter of the first switch VT1 is connected to the collector of the third switch VT3, and the fourth switch VT4 is connected to the collector of the second switch VT2, forming a full-bridge inverter circuit. Under the drive signal of the control current, it converts 308V into 20KHZ AC power.

[0050] The switching circuit is divided into four time periods, controlled by an electronic control system:

[0051] During time period T1: VT1 and VT4 are on, VT2 and VT3 are off.

[0052] At this time, the current direction is: positive terminal → VT1 → Cx → transformer → VT4 → ground.

[0053] During time period T2: VT1, VT4, VT2, and VT3 are all disconnected.

[0054] No current is generated during this period, which is called the dead time. This time period is used to prevent the bridge arm from being shot-through short-circuited, reduce switching losses, and improve system reliability.

[0055] During time period T3: VT1 and VT4 are disconnected, while VT2 and VT3 are connected.

[0056] At this point, the current direction is: positive terminal → VT2 → transformer → Cx → VT3 → ground.

[0057] During period T4: V11, V14, V12, and V13 are all disconnected from the circuit, and no current is generated at this time;

[0058] After four time periods, the current flowing through transformer T is exactly reversed. The DC current passes through the inverter to convert the DC power of the power supply system back into the AC power required for welding.

[0059] In a specific embodiment, the type of switching transistor is an insulated gate bipolar transistor (IGBT).

[0060] An insulated gate bipolar transistor (IGBT) is a combination of a MOSFET and a GTR, so it has the advantages of both. By rationally combining and optimizing the components, the welding power supply can concentrate its advantages. The combined advantages not only increase the stability of thermal temperature, but also allow for higher impedance and significantly improve working efficiency. In addition, the blocking voltage of an IGBT is higher than that of the same type of switching device.

[0061] In a specific embodiment, the core material of the intermediate frequency transformer T is an amorphous core, which is O-type and has a size of 130*80*60.

[0062] In this scheme, the magnetic core of the intermediate frequency transformer is an amorphous alloy core, which has higher magnetic flux density and better temperature characteristics compared with ferrite cores, thus avoiding saturation.

[0063] Specifications: O-type JSONL-1308060 magnetic core (outer diameter 130mm × inner diameter 80mm × thickness 60mm), effective cross-sectional area and magnetic circuit length optimized for high-frequency loss, suppressing eddy currents.

[0064] The primary winding of the intermediate frequency transformer has 17 turns, with 35 strands of wire per turn. The secondary winding has 6 turns in a 3+3 configuration, evenly distributed on both sides, with 97 strands of wire per turn.

[0065] Considering that coil distribution affects transformer operation, the different winding methods used for the primary and secondary windings will directly affect the reliability of the transformer. The thickness of the wound coils must be less than half the width of the core window. In this design, the primary winding has 17 turns, with 35 strands of multi-strand stranded wire (Ritz wire) per turn, i.e., conductor, to reduce high-frequency skin effect losses.

[0066] The secondary winding has 6 turns (3+3 symmetrical winding), with 97 strands of Ritz wire per turn, which can accommodate a large current of 630A and reduce the proximity effect;

[0067] The winding process involves primary and secondary layer winding, with a thickness less than 1 / 2 of the core window width, optimizing leakage inductance and distributed capacitance.

[0068] In a specific embodiment, the power supply system includes an input rectifier and a filter, wherein the filter is an EMI filter.

[0069] This solution employs an EMI filter. Furthermore, the low-frequency attenuation characteristics are improved by appropriately increasing the common-mode inductance. The filter capacitor is typically a film capacitor, with a capacitance range of approximately 0.1μF to 0.47μF, primarily used to filter out common-mode interference signals. To reduce leakage current, the capacitor capacitance must not exceed 0.1μF, and the capacitor's midpoint should be connected to ground. This solution selects a 0.1μF filter capacitor with a voltage rating of 630V.

[0070] The main function of an EMI filter circuit is to filter out switching noise and harmonics caused by the AC power input.

[0071] In a specific embodiment, the electronic control system includes an electronic control circuit and a drive circuit, wherein the electronic control circuit is a PWM / PFM hybrid control circuit.

[0072] In this design, the driving circuit is a voltage driving circuit commonly used for IGBT switching transistors.

[0073] The output power of an inverter-type arc welding power supply is determined by factors such as the inverter bridge topology, the DC voltage after grid rectification and filtering, the duty cycle of the control pulses, and the turns ratio of the intermediate frequency transformer. For a pre-designed inverter, its topology and transformer turns ratio are fixed and can be considered constants. In this case, the output power of the inverter arc welding power supply can only be adjusted by regulating the duty cycle of the control pulses. Therefore, adjusting the duty cycle of the control output pulses can control the output power of the inverter arc welding power supply. Currently, the following three methods are mainly used to modulate the output energy of the arc welding power supply.

[0074] PWM control, or pulse width modulation, controls the pulse width while maintaining the pulse frequency at a defined value. This method is primarily used in high-frequency inverter power supplies, such as MOSFET inverter arc welding power supplies and IGBT inverter arc welding power supplies. However, PWM has limitations, namely a relatively small adjustable range. Its advantage lies in the practicality of its control circuit structure, which stems from its simplicity and reliability. Therefore, despite its limitations, it remains the most widely used control method.

[0075] PFM control, in contrast to PWM control, regulates the welding power supply by controlling the output pulse frequency. It adjusts the pulse frequency while keeping the pulse width constant, and the output voltage gradually increases with the pulse frequency. Conversely, it compensates for the shortcomings of PWM. PFM control is generally suitable for lower-power inverter arc welding power supplies. Commonly used arc welding inverters employ PFM control, such as thyristor arc welding inverters. However, this method has some drawbacks: the output reactor is difficult to design, and the PFM control system struggles to handle load changes, hindering welding performance. These factors significantly increase the difficulty of transformer design, making it hard to improve welding efficiency and resulting in slightly insufficient welding output power. Therefore, designers have developed a combination of PWM and PFM control circuits, achieving synchronous adjustment of pulse width and pulse frequency—a more efficient method known as "frequency adjustment and pulse width adjustment." These two methods complement each other, enabling wide application and mitigating their respective advantages and disadvantages. This is currently the most commonly used control method.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A full-bridge inverter arc welding power transformer for ore carriers, characterized in that, include: Power supply system, electronic power system, given feedback system, and electronic control system; The power supply system is used to convert external alternating current (AC) into direct current (DC); the electronic power system is used to invert the DC into AC, and then rectify it again to output low-voltage DC to the load and the given feedback system; the given feedback system is used to adjust the voltage / current value of the input low-voltage DC to a preset range; the electronic control system is used to dynamically control the inverter power of the electronic power system according to the adjusted voltage / current value. The electronic power system includes a full-bridge inverter circuit, an output rectifier, and an RLC circuit. The output terminal of the full-bridge inverter circuit is connected to the input terminal of the output rectifier, and the output terminal of the output rectifier is connected to the input terminal of the RLC circuit. The full-bridge inverter circuit is used to invert the input DC current into AC current and AC voltage. The output rectifier is used to convert the AC current and AC voltage back into DC current and DC voltage, and output them to the external load and RLC circuit. The RLC circuit is used to amplify the input DC current signal to realize arc detection. The full-bridge inverter circuit includes four identical switching modules, a first magnetic core inductor L1, a DC blocking capacitor Cx, and an intermediate frequency transformer T; The output terminals of any two switching modules are connected to one end of the first magnetic core inductor L1 and one end of the primary side of the intermediate frequency transformer T, respectively; the input terminals of the other two switching modules are connected to one end of the first magnetic core inductor L1 and one end of the primary side of the intermediate frequency transformer T, respectively; the other end of the first magnetic core inductor L1 is connected to one end of the DC blocking capacitor Cx, and the other end of the DC blocking capacitor Cx is connected to the other end of the primary side of the intermediate frequency transformer T. The secondary side of the intermediate frequency transformer T is connected to the input terminal of the output rectifier.

2. The full-bridge inverter arc welding power transformer for ore carriers according to claim 1, characterized in that, The i-th switching module includes a switching transistor VTi, a diode VDi, a capacitor Ci, and a resistor Ri; i = 1, 2, 3, 4; The collector of the switching transistor VTi is connected to the negative terminal of the diode VDi and one end of the capacitor Ci. The emitter of the switching transistor VTi is connected to the positive terminal of the diode VDi and one end of the resistor Ri. The other end of the capacitor Ci is connected to the other end of the resistor Ri.

3. The full-bridge inverter arc welding power transformer for ore carriers according to claim 2, characterized in that, The emitters of any two switching transistors VTi are connected to one end of the first magnetic core inductor L1 and one end of the primary side of the intermediate frequency transformer T, respectively, to form the first switching circuit; The collectors of the other two switching transistors VTi are connected to one end of the first magnetic core inductor L1 and one end of the primary side of the intermediate frequency transformer T, respectively, forming the second switching circuit. In the first switching circuit, the emitter of the switching transistor VTi, which is connected to one end of the primary side of the intermediate frequency transformer T, is grounded; in the second switching circuit, the emitter of the switching transistor VTi, which is connected to one end of the first magnetic core inductor L1, is grounded.

4. The full-bridge inverter arc welding power transformer for ore carriers according to claim 2, characterized in that, The type of switching transistor is an insulated gate bipolar transistor.

5. The full-bridge inverter arc welding power transformer for ore carriers according to claim 1, characterized in that, The core material of the intermediate frequency transformer T is an amorphous core.

6. The full-bridge inverter arc welding power transformer for ore carriers according to claim 1, characterized in that, The electronic control system includes an electronic control circuit and a drive circuit, wherein the electronic control circuit is a PWM / PFM hybrid control circuit.

7. The full-bridge inverter arc welding power transformer for ore carriers according to claim 1, characterized in that, The power supply system includes an input rectifier and a filter, wherein the filter is an EMI filter.

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