Method for solving magnetic leakage interference of various transformers through active coupling

Abstract

The invention provides a method for solving magnetic leakage interference of various transformers through active coupling, which comprises the following steps of: placing a closed magnetic tape in parallel in the same direction of a leakage magnetic field, and adding a closed lead coil with a load resistor at the position of the closed magnetic tape in the direction in which the leakage magnetic field needs to be shielded, the height of the closed magnetic tape is larger than or equal to the height of a processed leakage magnetic core, the closed wire coil is wound on the closed magnetic tape, and the winding face of the closed wire coil is perpendicular to the direction of a leakage magnetic field in an orthogonal mode. The leakage magnetic field is actively converted into the current in the closed coil on the shielding magnetic tape through magnetic coupling, the current is consumed on the load resistor, the magnetic leakage problem of various magnet transformers can be effectively solved, and therefore interference on operation such as an internal circuit and data collection is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, in particular to a method for solving magnetic leakage interference of various transformers by active coupling. Background Art

[0002] In today's technology field, transformers are widely used in various small computers and equipment. During the operation of these transformers, magnetic flux coupling or transformation is the core principle of their voltage conversion and other functions, but at the same time, it inevitably causes the thorny problem of magnetic field leakage.

[0003] In complex electronic equipment environments, especially those application scenarios that require extremely high signal accuracy and stability, the hazards caused by magnetic field leakage cannot be underestimated. For example, in the field of medical equipment, if a transformer in a small monitoring device around a magnetic resonance imaging (MRI) device leaks a magnetic field, the magnetic field it generates will interfere with the human tissue imaging signal obtained by the MRI device, which may cause artifacts in the image and seriously affect the doctor's accurate diagnosis of the disease. For some implanted medical devices, such as pacemakers, magnetic field leakage from nearby equipment transformers may even interfere with the normal operation of the pacemaker, posing a threat to the patient's life safety.

[0004] In the field of communications, whether it is the signal processing equipment in the base station or the magnetic field leakage generated by the transformer related to the communication module in the mobile terminal, it will affect the communication signal. In the base station, it may reduce the transmission quality of the signal, increase the bit error rate, and reduce the communication efficiency. For mobile terminals, problems such as call interruption and unstable network connection may occur, seriously affecting the user's communication experience.

[0005] In the field of industrial automation control, some high-precision sensors and controllers are often extremely sensitive to magnetic field environments. For example, in semiconductor manufacturing workshops, magnetic field leakage may interfere with sensor signals in lithography equipment, leading to precision errors in the chip manufacturing process, reducing chip yields, and causing huge economic losses.

[0006] Moreover, the noise problem caused by this magnetic field leakage is not just a simple auditory interference. In audio equipment, such as the noise generated by transformer magnetic field leakage in high-end audio systems, it will be mixed into the audio signal, greatly reducing the purity of the audio and destroying the user's auditory enjoyment. Even in ordinary electronic devices, noise may interfere with the internal clock signal, causing deviations in the timing function of the device and affecting the synchronization of the entire system.

[0007] However, in the face of these serious problems, the current conventional simple shielding measures are difficult to play an effective role. Traditional shielding methods are mostly based on simple electromagnetic shielding principles, using metal covers and other methods, but these methods have many limitations for complex magnetic field leakage situations such as transformers. For example, the metal cover may resonate at certain frequencies, which amplifies the magnetic field interference; or because the shielding effectiveness of the metal cover is limited, it cannot completely block the leakage of low-frequency magnetic fields, so that the magnetic field can still penetrate and cause damage to surrounding circuits and equipment. Moreover, with the continuous development of the miniaturization trend of equipment, traditional shielding methods are more difficult to achieve efficient shielding effects in limited space, and cannot meet the strict requirements of modern scientific and technological equipment for low magnetic leakage interference. Summary of the invention

[0008] The purpose of the present invention is to provide a method for actively coupling to solve the magnetic leakage interference of various transformers. By actively converting the leakage magnetic field into a current in a closed coil on a shielding tape using magnetic coupling, and allowing the current to be consumed on a load resistor, the magnetic leakage problem of various magnetic transformers can be effectively solved, thereby reducing interference with internal circuits and data acquisition operations.

[0009] In order to achieve the above object, the present invention is implemented through the following technical solution: a method for actively coupling to solve magnetic leakage interference of various transformers, comprising the following steps:

[0010] A closed magnetic tape is placed in parallel in the same direction as the leakage magnetic field, and a closed conductive wire coil with a load resistor is added at the position of the closed magnetic tape in the direction in which the leakage magnetic field needs to be shielded. The height of the closed magnetic tape is greater than or equal to the height of the leakage magnetic core to be processed. The closed conductive wire coil is wound on the closed magnetic tape, and the winding surface of the closed conductive wire coil is orthogonal to the direction of the leakage magnetic field.

[0011] As a further improvement of the technical solution of the present invention, the closed magnetic tape is placed close to the leaking main magnetic core to surround the leaking magnetic core.

[0012] As a further improvement of the technical solution of the present invention, the number of turns of the closed conductive loop is one or more turns.

[0013] As a further improvement of the technical solution of the present invention, the resistance of the load resistor is 0-100Ω.

[0014] As a further improvement of the technical solution of the present invention, the leakage magnetic field is converted into a current in a closed coil on the shielding tape by using magnetic coupling, and the current is consumed in the load resistor.

[0015] As a further improvement of the technical solution of the present invention, the method is applicable to various types of transformers, including but not limited to power transformers, signal transformers, isolation transformers, and pulse transformers.

[0016] The present invention has the following beneficial effects:

[0017] 1. Efficiently solve the problem of magnetic leakage

[0018] The present invention can accurately handle the magnetic leakage problem of various transformers through a unique active coupling mechanism. Compared with the traditional method, it does not simply passively block the magnetic field, but actively converts the leakage magnetic field into a current on the closed coil on the shielding tape through magnetic coupling, and consumes it on the load resistance of the coil. This method fundamentally eliminates the impact of the magnetic leakage magnetic field on the surrounding environment, and both low-frequency and high-frequency magnetic leakage can be effectively suppressed.

[0019] 2. Reduce noise interference

[0020] The magnetic field changes caused by transformer magnetic leakage can cause mechanical vibration of the equipment, which in turn generates noise. This noise not only affects the environment around the equipment, but may also have a negative impact on the normal operation of the equipment itself. Eliminating magnetic leakage through this method can effectively reduce this noise interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0022] Figure 1 A schematic diagram of the structure of the leakage magnetic field of the embodiment;

[0023] Figure 2 The schematic diagram of the structure of assembling a closed magnetic tape, a closed conductive coil and a load resistor on the leakage magnetic field is shown in the embodiment.

[0024] In the attached figure: 1- leakage magnetic field; 2- closed magnetic tape; 3- load resistance; 4- closed conductive coil. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, upper end, lower end, top, bottom...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In the present invention, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features; in addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0030] like Figure 1 and Figure 2 As shown, a method for actively coupling to solve magnetic leakage interference of various transformers includes the following steps:

[0031] A closed magnetic tape 2 is placed in parallel in the same direction as the leakage magnetic field 1. In the direction where the leakage magnetic field 1 needs to be shielded, a closed conductive coil 4 with a load resistor 3 is added to the position of the closed magnetic tape 2. The height of the closed magnetic tape 2 is greater than or equal to the height of the leakage magnetic core to be processed. The closed conductive coil 4 is wound on the closed magnetic tape 2, and the winding surface of the closed conductive coil 4 is orthogonal to the direction of the leakage magnetic field 1. The present invention can accurately deal with the magnetic leakage problem of various transformers through a unique active coupling mechanism. Compared with the traditional method, it does not simply passively block the magnetic field, but actively converts the leakage magnetic field 1 into a current on the closed coil on the shielding magnetic tape through magnetic coupling, and consumes it on the load resistor 3 of the coil. This method fundamentally eliminates the impact of the magnetic leakage magnetic field 1 on the surrounding environment, and both low-frequency and high-frequency magnetic leakage can be effectively suppressed. The magnetic field changes generated by the magnetic leakage of the transformer will cause mechanical vibration of the equipment, and then generate noise. This noise not only affects the environment around the equipment, but may also have a negative impact on the normal operation of the equipment itself. Eliminating magnetic leakage by this method can effectively reduce such noise interference.

[0032] Specifically, in this embodiment, the closed magnetic tape 2 is placed close to the leaking main magnetic core to surround the leaking magnetic core.

[0033] Specifically, in this embodiment, the number of turns of the closed conductive coil 4 is one or more turns.

[0034] Specifically, in this embodiment, the resistance of the load resistor 3 is 0-100Ω.

[0035] Specifically, in the present embodiment, the leakage magnetic field 1 is transformed into a current in a closed coil on the shielding magnetic tape by using magnetic coupling, and the current is consumed by the load resistor 3 .

[0036] Specifically, in this embodiment, the method is applicable to various types of transformers, including but not limited to power transformers, signal transformers, isolation transformers, and pulse transformers.

[0037] It should be noted that compared with traditional shielding methods, this method has the following advantages:

[0038] 1. Effectiveness

[0039] Traditional methods

[0040] Traditional simple shielding measures are often ineffective in dealing with transformer magnetic leakage interference. This is because traditional shielding may simply use some physical isolation materials to block the magnetic field, but the magnetic field generated by transformer magnetic leakage has a certain degree of penetration, and these conventional shielding materials cannot effectively eliminate the impact of magnetic leakage. For example, some simple metal cover shielding methods have very limited shielding effects on low-frequency magnetic fields, because low-frequency magnetic fields can generate induced currents in the metal cover, which then penetrate the metal cover and affect the internal circuit.

[0041] Method of the present invention

[0042] This method actively converts the leakage magnetic field into a current on a closed coil on a shielding tape through magnetic coupling, and consumes it on the load resistance of the coil. This active coupling method can deal with the magnetic leakage problem from the root, and by converting the magnetic field energy into electrical energy and consuming it, it effectively reduces the interference of the leakage magnetic field on the surrounding circuits and equipment, and greatly improves the effect of solving the magnetic leakage interference.

[0043] 2. Simplicity

[0044] Traditional methods

[0045] If traditional shielding methods want to achieve better shielding effects, complex structural designs may be required. For example, multiple layers of shielding materials must be used, or the thickness, shape and other parameters of the shielding materials must be accurately calculated. In addition, the structure of the transformer itself may need to be modified to accommodate the shielding measures. This undoubtedly increases the complexity and cost of shielding.

[0046] Method of the present invention

[0047] The method of the present invention is relatively simple. It mainly places a closed magnetic tape and a closed conductive coil wound with a load resistor in the direction of the leakage magnetic field, and the arrangement of the magnetic tape and the coil is relatively direct. In actual operation, it is only necessary to place a closed magnetic tape close to the leakage main magnetic core in the direction of the magnetic leakage magnetic field (or in the same direction and parallel), wind a suitable closed conductive coil on the magnetic tape, and adjust the load resistance. There is no need for complex transformation of the transformer itself, nor is there a need for a complex multi-layer shielding structure, and it is easy to implement.

[0048] 3. Flexibility

[0049] Traditional methods

[0050] Once the traditional shielding is installed, its shielding effect is basically fixed. If you want to change the shielding effect, such as dealing with magnetic leakage of different strengths or magnetic fields of different frequencies, you may need to redesign and replace the shielding device, which is very inconvenient in practical applications.

[0051] Method of the present invention

[0052] This method is excellent in flexibility. The load resistance added to the closed conductor coil wound by the magnetic tape can be selected as an appropriate value in the range of 0-100Ω as required. By adjusting the size of the load resistance, the coupling degree and energy consumption of the magnetic leakage can be flexibly controlled, thereby adapting to magnetic leakage interference under various conditions such as different intensities and frequencies, and can be optimized and adjusted according to actual conditions.

[0053] Implementation process:

[0054] Preparation

[0055] Determine transformer parameters: First, conduct a detailed analysis of the transformer that needs to deal with magnetic leakage problems, including its type (such as power transformer, signal transformer, isolation transformer, etc.), power size, operating voltage range, core material, size (height, length, width, etc.), and magnetic flux density and magnetic field distribution during normal operation. These parameters will provide a basis for the subsequent selection of appropriate closed magnetic tapes, conductor coils, and load resistors. For example, for a power transformer with a power of 500W and an operating voltage of 220V-12V, the core size is 10cm long, 8cm wide, and 6cm high. The magnetic flux density value during normal operation, we need to determine the specifications of related components based on these data.

[0056] Select closed tape: Select a suitable closed tape according to the core height and magnetic field distribution range of the transformer. The height of the tape should not be less than the core height of the transformer, and a certain margin (such as 5%-10%) can be appropriately increased to ensure that the magnetic leakage area is fully covered. The material of the tape should have high magnetic permeability, and its magnetic permeability value can be selected according to actual needs. For example, materials such as Permalloy can be selected. For the transformer in the above example, a Permalloy tape with a height of 6.5cm, a thickness of 0.5mm, and a width of 12cm can be selected.

[0057] Determine the coil parameters: The winding surface of the coil should be perpendicular to the leakage magnetic field. Determine the number of coils according to the power of the transformer and the expected magnetic leakage intensity. The wire used in the coil should have low resistance and high conductivity, and materials such as copper and silver can be used. The wire diameter is determined according to the current passing through. After calculating the expected current through electromagnetic calculation software or empirical formula, select the appropriate wire diameter according to the current-wire diameter comparison table.

[0058] Select the load resistor: The selection of the load resistor is crucial, as it determines the degree of consumption of magnetic leakage energy. According to the power of the transformer, the parameters of the conductor coil, and the desired magnetic leakage suppression effect, select an appropriate value in the range of 0-100Ω. A preliminary value can be determined by theoretical calculation and electromagnetic simulation, and then fine-tuned in actual testing. The range of load resistor values ​​varies for different types of transformers and working environments. At the same time, the power of the load resistor should be calculated based on the current and voltage that may be generated in the conductor coil to ensure that the resistor will not be overheated and damaged during operation. Its power is generally 1.2-1.5 times greater than the calculated power.

[0059] Installation Phase

[0060] Place closed tape: Place closed tape around the transformer core in the same direction (or parallel to the same direction) as the magnetic leakage field. Place the tape close to the leakage main core to keep the distance between the tape and the core in the optimal range. This distance is determined by the power of the transformer, the core size and the leakage magnetic field strength. For the transformer in the above example, the distance between the tape and the core can be controlled at 2-3mm. Use a fixing clamp or adhesive to fix the tape in a suitable position to ensure that the tape does not move during the operation of the equipment. When placing the tape, pay attention to the accuracy of its direction and position. The relative position accuracy of the tape and the core should be within 2-3mm to ensure effective capture of the leakage magnetic field.

[0061] Winding the guide coil: Wind the selected wire on the closed magnetic tape to form a guide coil. The winding process must ensure the uniformity and tightness of the coil to avoid crossing or loosening between wires. At the start and end of the winding, the wire must be fixed to prevent the wire from loosening or falling off during the operation of the equipment. After the winding is completed, check whether the winding surface of the guide coil is strictly orthogonal to the leakage magnetic field direction. If there is a deviation, the position of the magnetic tape and the guide coil can be adjusted appropriately to ensure that the angle accuracy of the two is within the normal range. For multi-turn guide coils, pay attention to the uniformity of the spacing between each turn to ensure the uniformity of magnetic field coupling.

[0062] Connect the load resistor: Connect the load resistor to both ends of the closed conductor coil. The connection method can be a reliable electrical connection method such as welding, plug-in connector, etc., to ensure that the contact resistance of the connection point is small enough to reduce energy loss and heat. During the connection process, pay attention to the polarity of the resistor (if it is a polar resistor) or the connection sequence (for non-polar resistors) to avoid wrong connection and circuit abnormality. At the same time, the connection point should be insulated to prevent short circuits. Insulation tape or insulation sleeves can be used for protection.

[0063] Debugging and optimization phase

[0064] Initial test: After completing the installation of the closed tape, the conductor coil and the load resistor, perform a preliminary power-on test on the device. Use a magnetic field measuring instrument (such as a gauss meter, etc.) to measure the magnetic field strength and distribution around the transformer and compare it with the data before the device was installed. At the same time, observe the operating status of the device and check for any abnormalities, such as circuit heating, increased equipment noise, etc. If it is found that the magnetic field strength has not been significantly reduced or abnormal conditions have occurred, it is necessary to check whether the installation of each component is correct, such as whether the tape is accurately positioned, whether the conductor coil is short-circuited or open-circuited, and whether the load resistor is well connected.

[0065] Load resistance adjustment: According to the initial test results, adjust the value of the load resistance. If the magnetic leakage is still serious, the value of the load resistance can be appropriately increased to increase the consumption of the magnetic field energy of the magnetic leakage; if the equipment operation is found to be abnormal (such as overheating of the conductor coil, etc.), it may be that the load resistance is too large and the resistance value needs to be appropriately reduced. The adjustment process can be carried out step by step, and the magnetic field measurement and equipment operation status inspection must be re-performed after each adjustment. When adjusting the load resistance, an adjustable resistor (such as a potentiometer, etc.) can be used for fine adjustment until a satisfactory magnetic leakage suppression effect is achieved. At the same time, the magnetic field strength, equipment operating parameters and other data under different load resistance values ​​should be recorded for subsequent analysis and optimization.

[0066] Long-term stability test: After completing the initial adjustment of the load resistance, conduct a long-term equipment operation test to observe the magnetic leakage suppression effect and the long-term stability of the equipment operation. During the test, the magnetic field strength can be measured regularly to check whether there is a trend of increasing magnetic leakage intensity. At the same time, monitor the temperature, noise, electrical performance and other indicators of the equipment to ensure that the equipment will not experience performance degradation or failure during long-term operation due to the implementation of this method. If problems are found during the long-term test, the causes should be analyzed in a timely manner, and further adjustments or replacements of the closed tape, conductor coil or load resistor may be required. For example, if it is found that the magnetism of the tape has weakened over time, consider replacing it with a higher quality tape material or increasing the thickness of the tape; if the conductor coil is aged or partially short-circuited, the conductor coil should be repaired or replaced in a timely manner.

[0067] Tests under different working conditions: Test the equipment under different working conditions, such as different load conditions (no load, light load, full load, overload, etc.), different ambient temperatures (low temperature, normal temperature, high temperature, etc.) and humidity conditions. Under different load conditions, observe the changes in magnetic leakage and equipment performance, and further optimize the value of the load resistor or the coil parameters according to the changes. For different temperature and humidity environments, check the performance stability of the magnetic tape, coil and load resistor, such as whether the magnetic permeability of the magnetic tape is affected by temperature and humidity, whether the resistance of the coil has a large deviation due to temperature changes, and whether the load resistor has leakage in a humid environment. If problems are found, take appropriate measures to improve them, such as moisture-proofing the equipment and selecting materials with better temperature and humidity adaptability. Through testing and optimization under different working conditions, it is ensured that this method can effectively solve the magnetic leakage problem of the transformer in various practical application scenarios and ensure the stable operation of the equipment.

[0068] Adjustments for different devices and scenarios

[0069] Multi-transformer system: In a system with multiple transformers working together, the magnetic field interaction between each transformer must be considered comprehensively. First, each transformer is processed according to the above steps, and then unified planning and layout are carried out according to the overall magnetic field distribution of the system. The magnetic field distribution when multiple transformers work simultaneously can be simulated by magnetic field simulation software to determine whether the closing tape, wire coil or load resistance parameters of some transformers need to be further adjusted. For example, if the two transformers are close to each other and the magnetic fields affect each other, it may be necessary to appropriately increase the height of the tape or adjust the number of wire coils to enhance the suppression effect of magnetic leakage and avoid the deterioration of magnetic leakage problems due to the mutual influence of magnetic fields between transformers.

[0070] Different types of transformers: For different types of transformers (such as pulse transformers, audio transformers, etc.), their operating frequencies, magnetic flux change characteristics, etc. are different from those of ordinary power transformers. When applying this method, targeted adjustments should be made according to the specific characteristics of the transformer. For example, for pulse transformers, due to their pulse working characteristics, the frequency components and intensity changes of magnetic leakage are more complex. At this time, the parameters of the conductor coil (such as the number of turns, wire diameter, etc.) and the value of the load resistor should be recalculated and adjusted according to the frequency, amplitude and other parameters of the pulse. For audio transformers, special attention should be paid to the suppression of magnetic leakage within the audio frequency band. By optimizing the winding method of the conductor coil and the frequency characteristics of the load resistor, the interference to the audio signal can be reduced and the sound quality of the audio equipment can be improved.

[0071] Special environment applications: In some special environments, such as aerospace, military, medical and other fields, there are special requirements for equipment. In aerospace equipment, the weight limit and high reliability requirements of the equipment should be taken into account. At this time, the materials for closed magnetic tapes and wire coils should be lightweight and high-performance materials, such as using new lightweight high-permeability composite materials to make magnetic tapes, and using lightweight high-temperature superconducting materials (under applicable conditions) to make wire coils. In the military field, attention should be paid to the confidentiality and anti-interference ability of the equipment. In addition to effectively solving the problem of magnetic leakage, the electromagnetic radiation of the entire equipment should be strictly controlled. The safe operation of military equipment in complex electromagnetic environments can be ensured by adding an electromagnetic shielding layer combined with this method. In medical equipment, it is necessary to ensure that this method does not cause any potential harm to patients, such as using materials that meet medical safety standards to avoid generating new electromagnetic radiation or interfering with medical signals during the operation of the equipment. At the same time, for high-precision sensors and signal processing circuits in medical equipment, the magnetic leakage suppression effect should be further optimized to improve the accuracy of diagnostic equipment and the safety of treatment equipment.

[0072] Implementation Cases:

[0073] Case 1: Power transformer in small electronic equipment

[0074] Device background

[0075] There is a power transformer inside the small smartphone charger, which is used to convert the mains voltage into a low voltage suitable for charging the phone. In the traditional design, due to the magnetic leakage of the transformer, weak magnetic field interference will be generated. This interference may affect the control circuit inside the charger, resulting in reduced charging efficiency or electromagnetic noise during charging.

[0076] The effect after applying this method

[0077] According to the method of the present invention, a closed magnetic tape is placed in the same direction of the leakage magnetic field of the transformer core, and a closed conductive coil with a load resistor is wound around it. When the charger is working, the originally leaked magnetic field is actively coupled to the closed coil. By reasonably setting the load resistance, the magnetic energy is converted into electrical energy and consumed. After testing, it was found that the electromagnetic noise during the charging process was significantly reduced, and the previous "buzzing" sound caused by magnetic leakage interference was almost inaudible. At the same time, the charging efficiency was tested and it was found that the charging efficiency was increased by about 10%-15%. This is because the interference of magnetic leakage on the control circuit is reduced, so that the circuit can work more stably, thereby improving the efficiency of the entire charging process.

[0078] Case 2: Signal transformer in industrial control equipment

[0079] Device Background

[0080] In industrial automation control equipment, there are some signal transformers used to isolate and convert signals. If there is magnetic leakage in these transformers, it will interfere with the surrounding sensitive signal acquisition circuits. For example, in a temperature sensor signal acquisition system, the magnetic leakage magnetic field of the signal transformer interferes with the weak analog signal from the temperature sensor, causing deviations in the collected temperature data and affecting the accuracy of the entire industrial control process.

[0081] The effect after applying this method

[0082] The active coupling method of the present invention is adopted to arrange a closed magnetic tape and a closed conducting coil around the magnetic core of the signal transformer. In actual operation, the leakage magnetic field is successfully coupled to the conducting coil and consumed by the load resistor. After field testing, the accuracy of temperature signal acquisition has been greatly improved. The temperature data deviation caused by magnetic leakage interference has been reduced from ±5°C to within ±0.5°C, so that industrial control equipment can perform precise control operations according to accurate temperature signals, such as temperature adjustment, alarm and other functions can operate normally and stably, effectively avoiding production accidents caused by signal interference.

[0083] Case 3: Isolation transformer in medical equipment

[0084] Device background

[0085] Medical equipment such as electrocardiographs (ECGs) have isolation transformers inside to ensure patient safety and signal isolation. However, transformer magnetic leakage may interfere with the acquisition and processing of ECG signals. Traditionally, this interference may produce tiny artifacts on the ECG, affecting doctors' accurate judgment of the patient's heart condition.

[0086] The effect after applying this method

[0087] When this method is applied to the isolation transformer, the closed magnetic tape and the wire coil effectively couple the magnetic leakage and consume energy. A comparative analysis of the ECG signal quality shows that the interference artifacts in the signal are significantly reduced. In actual clinical applications, doctors can obtain clearer and more accurate electrocardiograms, improve the reliability of diagnosis, reduce the risk of misdiagnosis caused by magnetic leakage interference, and provide stronger protection for medical diagnosis.

[0088] Case 4: Communication base station power transformer case

[0089] Background: There are a large number of power transformers in communication base stations to provide stable power for base station equipment. The magnetic leakage generated by these transformers during operation may interfere with sensitive communication signal transmission and reception equipment in the base station. For example, in a 4G / 5G communication base station, due to the magnetic leakage of the power transformer, the nearby signal transceiver experienced signal jitter and increased bit error rate. The base station staff initially tried to use traditional metal shielding covers to solve the problem, but the effect was not good, and the bit error rate remained at a high level, affecting the communication quality.

[0090] Effect after applying this method: A closed magnetic tape and a closed conducting coil with a load resistor were installed on the power transformer according to the method of the present invention. After a period of operation and monitoring, it was found that the bit error rate of the signal transceiver dropped significantly. Before the use of this method, the bit error rate was about 1%-3%, and after the application, the bit error rate dropped to below 0.1%. At the same time, the signal jitter has also been greatly improved, and the stability of the communication signal has been effectively guaranteed, thereby ensuring that the base station can provide high-quality communication services to surrounding users.

[0091] Case 5: Audio power amplifier transformer case

[0092] Background: In high-end audio power amplifiers, the quality and performance of the transformer has a critical impact on the purity of the audio output. Magnetic leakage can cause interference with the audio signal, resulting in hum or other noise. A user of a professional-grade audio power amplifier reported that there was always a faint but noticeable hum in the background when playing audio. This was caused by the internal transformer magnetic leakage interfering with the audio circuit. Manufacturers have tried a variety of traditional shielding methods, such as increasing the thickness of the magnetic shielding material and using a multi-layer shielding structure, but the improvement in audio quality was limited.

[0093] Effect after applying this method: The active coupling method of the present invention is applied to the transformer of the audio power amplifier. After installing the closed magnetic tape and the closed conductor coil and adjusting the load resistance, the audio output is tested. The results show that the previously existing humming sound almost completely disappears, and the purity of the audio signal is greatly improved. Through professional audio equipment testing, the signal-to-noise ratio of the audio signal is increased from about 70dB to more than 90dB, providing users with a purer, noise-free, high-quality audio experience.

[0094] Case 6: Computer Server Power Transformer Case

[0095] Background: In computer servers in data centers, power transformers are one of the key components. Magnetic leakage may interfere with components such as the motherboard circuit, storage devices, and network interfaces inside the server. For example, a server in a data center experienced data transmission errors and storage data loss. After investigation, it was found that the magnetic leakage of the power transformer interfered with the circuit signals inside the server. Although traditional shielding measures have alleviated the problem to a certain extent, they have not fundamentally solved the magnetic leakage interference.

[0096] Effect after applying this method: After the server power transformer is processed by the method of the present invention, the operation stability of the server is significantly improved. After a period of monitoring, the data transmission error rate has been reduced from about 5-10 errors per million bytes to less than 1 error per million bytes. The loss of stored data has almost disappeared, because the active coupling method effectively reduces the interference of magnetic leakage on the internal circuit of the server, ensures the normal operation of the server, and reduces the maintenance cost and data risk of the data center.

[0097] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for solving magnetic leakage interference of various transformers by active coupling, characterized in that: The following steps are involved: A closed magnetic tape is placed in parallel in the same direction as the leakage magnetic field, and a closed conductive wire coil with a load resistor is added at the position of the closed magnetic tape in the direction in which the leakage magnetic field needs to be shielded. The height of the closed magnetic tape is greater than or equal to the height of the leakage magnetic core to be processed. The closed conductive wire coil is wound on the closed magnetic tape, and the winding surface of the closed conductive wire coil is orthogonal to the direction of the leakage magnetic field.

2. The method for solving magnetic leakage interference of various transformers by active coupling according to claim 1 is characterized in that: The closed magnetic tape is placed close to the leakage main magnetic core to surround the leakage magnetic core.

3. The method for solving magnetic leakage interference of various transformers by active coupling according to claim 1 is characterized in that: The number of turns of the closed conductive coil is one or more turns.

4. The method of actively coupling to solve magnetic leakage interference of various transformers according to claim 1 is characterized in that: The load resistor has a resistance value of 0–100Ω.

5. The method of actively coupling to solve magnetic leakage interference of various transformers according to claim 1 is characterized in that: The leakage magnetic field is converted into a current in a closed coil on the shielding tape by magnetic coupling, and the current is consumed in the load resistor.

6. The method of actively coupling to solve magnetic leakage interference of various transformers according to claim 1 is characterized in that: The method is applicable to various types of transformers, including but not limited to power transformers, signal transformers, isolation transformers, and pulse transformers.

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