50mT static magnetic field immunity detection device

Abstract

The utility model discloses a 50mT static magnetic field immunity detection device. The device is characterized by comprising a current source, a safety protection execution device, a test time control device, a current fusing protection device, a current monitoring device, a voltage monitoring device, a current transmission line, a static magnetic field radiation device, a magnetic field verification device, a field intensity meter, a current early warning device, a voltage early warning device, a temperature early warning device, a magnetic field exposure leakage early warning device and a temperature monitoring device, the device comprises a magnetic field exposure leakage monitoring device, a control system, a manual emergency control device and a tested sample performance monitoring device. The device can generate a static magnetic field with the field intensity of 50mT and below under the condition of smaller input current, and has the functions of early warning of current, voltage, test time, temperature, magnetic field exposure and the like. The linearity of a static magnetic field in a test area of the device reaches 0.6%, and the uniformity of the static magnetic field reaches 2.8%. The device also can output and adjust the intensity of the magnetic field according to the monitoring parameters of the tested sample so as to realize the purpose of measuring the static magnetic field threshold which can be borne by the tested sample.

Description

Technical Field

[0001] The utility model relates to a 50mT static magnetic field immunity detection device for electromagnetic compatibility tests, belonging to the field of electromagnetic compatibility tests. Background Technique

[0002] With the wide application of active implantable medical devices, their electromagnetic field exposure risks and electromagnetic compatibility have attracted extensive attention, especially the safety and reliability under strong electromagnetic field conditions at close range. The electromagnetic compatibility safety mainly characterizes whether it can operate stably according to the expected performance requirements under specific electromagnetic interference conditions, and needs to be evaluated through electromagnetic compatibility tests. It mainly includes two parts: external emission (mainly including conduction and radiation) and resistance to external electromagnetic interference (electromagnetic radiation field, electromagnetic pulse, etc.). Among them, the performance of resistance to external electromagnetic interference (including electromagnetic radiation field, electromagnetic pulse, etc.) directly determines whether the device can meet the expected stable operation in the possible electromagnetic environment where it may be exposed.

[0003] The ICNIRP guidelines stipulate that the upper limit of public exposure to static magnetic fields is 400mT (about 3.2×10 5 A / m). Implantable medical devices and ferromagnetic implants may still face safety risks caused by electromagnetic field exposure. The ISO 14117 and ISO 14708 series of standards stipulate that active implantable medical devices need to meet the static magnetic field test requirements of 1mT, 10mT, and 50mT for static magnetic fields. The deviation of the test uniform area is less than 10%. A large deviation will bring great uncertainty to the test results. In order to reduce the test result deviation, it is necessary to further improve the field strength uniformity and the linearity of the magnetic field output in the test area. For a magnetic field test device of 50mT (about 40000A / m or 500Gs), the current control, test time control, temperature monitoring, and peripheral electromagnetic field exposure of the magnetic field test device are all important contents for improving the reliability and safety of the magnetic field test device. In particular, the high-intensity electromagnetic field exposure of auxiliary equipment may cause it to be in an abnormal working state. Therefore, on the basis of meeting the stable magnetic field test conditions, the high-intensity magnetic field test device also needs to fully solve the safety problem. Content of the Utility Model

[0004] The purpose of the utility model is to provide a 50mT magnetic field immunity detection device for electromagnetic compatibility tests, realizing that under the static magnetic field conditions of test levels of 50mT and below, the uniformity of the magnetic field test uniform area is 2.8%, the linearity is 0.6%, and it can also realize the trigger alarm and shutdown functions for safety risk factors such as voltage, current, time, temperature, and electromagnetic field exposure.

[0005] To achieve the above object, the technical solution of the present utility model discloses a 50mT static magnetic field immunity detection device, which is characterized in that it includes a current source, a safety protection execution device, a test time control device, a current fusing protection device, a current monitoring device, a voltage monitoring device, a current transmission line, a static magnetic field radiation device, a magnetic field calibration device, a current warning device, a voltage warning device, a temperature warning device, a magnetic field leakage warning device, a temperature monitoring device, a magnetic field exposure monitoring device, a control system, an artificial emergency control device, a monitored sample performance monitoring device, and a field strength meter, wherein:

[0006] The current source, the safety protection execution device, the test time control device, the current fusing protection device, the current monitoring device, and the voltage monitoring device are connected in sequence. The voltage monitoring device is connected to the static magnetic field radiation device via the current transmission line. The static magnetic field radiation device is connected to the magnetic field calibration device and the field strength meter in sequence. The static magnetic field radiation device is also connected to the temperature monitoring device and the magnetic field exposure monitoring device. The temperature monitoring device is connected to the temperature warning device. The magnetic field exposure monitoring device is connected to the magnetic field leakage warning device. The temperature warning device and the magnetic field leakage warning device are connected to the control system. After the current monitoring device is connected to the current warning device, it is then connected to the control system. After the voltage monitoring device is connected to the voltage warning device, it is then connected to the control system. The control system is also connected to the current source, the safety protection execution device, and the monitored sample performance monitoring device, and the current source is also connected to the artificial emergency control device.

[0007] Preferably, the current source adopts a programmable DC source with a constant current mode, and the current accuracy is better than 1 mA.

[0008] Preferably, the test time control device adopts a high-precision digital switch, and the shutdown time of the digital switch is maintained between 10 μs and 10 ms to avoid forming a large transient gradient field during the switching process.

[0009] Preferably, the static magnetic field radiation device includes a base, a radiation coil, a track support frame, a current input port, a track support frame support, a sample transfer track, and a screw drive device. Among them, the radiation coil is arranged on the base. The track support frame is supported on the base through the track support frame support. A sample transfer track driven by the screw drive device is arranged inside the radiation coil. The radiation coil is connected to the current input port.

[0010] The utility model discloses a 50mT magnetic field immunity detection device for electromagnetic compatibility tests. The utility model can achieve a uniformity of 2.8% and a linearity of 0.6% in the uniform domain of the magnetic field test under static magnetic field conditions of 50mT and below. The device can effectively control the risks in the test by monitoring voltage, current, time, temperature, and electromagnetic field exposure. At the same time, it can also adjust the current-magnetic field output, alarm, and shutdown functions according to the performance parameters of the test sample. In addition, it also has protection measures for manual emergency shutdown and overcurrent shutdown.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] 1. It can generate a static magnetic field with a field strength of 50mT and below;

[0013] 2. The linearity in the range of 0.55mT - 50mT is 0.6%;

[0014] 3. The deviation in the range of 50mT and below in the uniform domain is 2.8%;

[0015] 4. The output time of the 50mT magnetic field is greater than 5 minutes;

[0016] 5. It has a current warning device and a protection execution function;

[0017] 6. It has a voltage warning device and a protection execution function;

[0018] 7. It has a temperature warning device and a protection execution function;

[0019] 8. It has a magnetic field radiation device temperature device and a protection execution function;

[0020] 9. It has a magnetic field exposure warning device and a protection execution function;

[0021] 9. It has a structure with a low dielectric constant device and a calibration bracket;

[0022] 10. It has a control system for linkage adjustment of field strength and current;

[0023] 11. It has a moving guide rail for the test sample, which can realize the slow entry of the test sample into the 50mT static magnetic field test area;

[0024] 12. In addition to meeting the requirements of static magnetic field tests, the device can also meet the requirements of lower-level alternating magnetic field tests with a frequency below 50Hz. Description of the Drawings

[0025] Figure 1 It is a functional schematic diagram of a 50mT static magnetic field immunity detection device;

[0026] Figure 2 It is a control schematic diagram of a 50mT static magnetic field immunity detection device;

[0027] Figure 3 It is a front view of a static magnetic field radiation device;

[0028] Figure 4 It is a side view of a static magnetic field radiation device;

[0029] Figure 5 It is an example of a calibration point of a static magnetic field radiation device;

[0030] Figure 6 It is a schematic diagram of the installation of a static magnetic field calibration fixture;

[0031] Figure 7 It is the current-field strength correspondence; Specific implementation manners

[0032] The following further elaborates the present utility model in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model. In addition, it should be understood that after reading the content taught by the present utility model, those skilled in the art can make various changes or modifications to the present utility model, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0033] Embodiment 1

[0034] As Figure 1 、 Figure 2 and Figure 3 shown, a 50mT static magnetic field test device disclosed in this embodiment includes a current source 1, a safety protection execution device 2, a test time control device 3, a current fuse protection device 4, a current monitoring device 5, a voltage monitoring device 6, a current transmission line 7, a static magnetic field radiation device 8, a magnetic field calibration device 9, a current warning device 10, a voltage warning device 11, a temperature warning device 12, a magnetic field leakage warning device 13, a temperature monitoring device 14, a magnetic field exposure monitoring device 15, a control system 16, an artificial emergency control device 17, a monitored sample performance monitoring device 18, and a field strength meter 19.

[0035] The current source 1 is a DC power supply used to provide high-precision DC current and can output stable current in constant current mode or constant voltage mode. The control mode of the current source 1 can be manual and program control. In a preferred embodiment, the current source 1 is a program-controlled high-precision DC source with a constant current output mode. In a preferred embodiment, the accuracy of the current source 1 is better than 0.01A. In a preferred embodiment, the current fluctuation of the current source 1 is less than 0.01A. In a preferred embodiment, the upper and lower limits of the voltage / current of the current source 1 should meet the voltage requirements of the static magnetic field radiation device 8 under the condition of constant current output. In this embodiment, the current source 1 uses a program-controlled DC power supply with a constant current function. The voltage output range is 0 - 200V, and the accuracy is better than 0.1V. The current output range is 0 - 10A, and the accuracy is better than 0.01A.

[0036] The safety protection execution device 2 is an output control device between the output of the current source 1 with program linkage control and the static magnetic field radiation device 8. The output control instruction is issued by the control system 16 and is not allowed to automatically resume the closed state and energized state. The initialization conduction setting of the safety protection execution device 2 can only be achieved manually. In this embodiment, the safety protection execution device 2 is implemented by triggering a relay.

[0037] The test time control device 3 is a timing switch used to prevent the static magnetic field radiation device 8 from being in a high-intensity magnetic field output state for a long time and to prevent the test sample from being exposed to the static magnetic field for a time exceeding the expected test time. In a preferred embodiment, the response time of the test time control device 3 is better than 0.1s. In a preferred embodiment, according to actual needs, the shutdown time of the test time control device 3 is set to 1ms - 100ms to prevent the test sample from being damaged by the instantaneous gradient field. If a test gradient field is required, the shutdown time can be set according to needs. In this embodiment, the test time control device 3 uses a time relay with an accuracy better than 0.1s and a controllable time range of 60min.

[0038] The current fusing protection device 4 is an overcurrent protection device including a fuse with various combinations. The fuse can be single, or multiple in parallel or series. In a preferred embodiment, the upper limit of the fuse current is 1.1 - 1.2 times the rated current required for the test field strength. In this embodiment, the fusing current of the current fusing protection device 4 is 6A.

[0039] The current monitoring device 5 is a high-precision ammeter that supports program control and data acquisition. The ports can adopt protocol ports such as USB, LAN, and GPIB. In a preferred embodiment, the accuracy of the current monitoring device 5 is better than 1 mA. In a preferred embodiment, the range of the current monitoring device 5 is 0 - 10 A. In this embodiment, the current monitoring device 5 uses a high-precision digital meter with a range of 0 - 10 A and an accuracy better than 1 mA.

[0040] The voltage monitoring device 6 is a high-precision voltmeter that supports program control and data acquisition. The ports can adopt protocol ports such as USB, LAN, and GPIB. In a preferred embodiment, the accuracy of the voltage monitoring device 5 is better than 1 mV. In a preferred embodiment, the range of the voltage monitoring device 5 is 0 - 120 V. In this embodiment, the voltage monitoring device 6 uses a high-precision voltmeter with a range of 0 - 120 V and an accuracy better than 1 mV.

[0041] The current transmission line 7 is a metal wire that realizes the transmission of current from the current source 1 to the static magnetic field radiation device 8, and its length is greater than the safety distance used by the static magnetic field radiation device 8. The safety distance refers to the operating safety distance and the safety distance of the device from interference. In a preferred embodiment, the length of the current transmission line 7 is 0.5 - 2 m.

[0042] The static magnetic field radiation device 8 uses a solenoid wound with multiple turns of coils, a Helmholtz coil, or a magnetic field emission coil to convert the current transmitted to the static magnetic field radiation device 8 into a magnetic field. The inner diameter of the static magnetic field radiation device 8 is greater than twice the axial length of the target test sample. In a preferred implementation, a high electrical conductivity, non-ferromagnetic, and low-inductance wire is used to improve the uniformity and linearity of the magnetic field strength in the test area and reduce the heat generation of the wire. In a preferred implementation, the electrical conductivity of the wire is greater than 50 S / m. In a preferred implementation, the deviation within the test uniform domain is less than 3%. In a preferred implementation, the linearity within the range of 0.055 mT - 10 mT is better than 0.6%. In a preferred implementation, the inner diameter of the static magnetic field radiation device 8 maintains an inner diameter difference of 1 mm from the center line outwards, facilitating the installation and fixation of the magnetic field calibration device 9. In a preferred implementation, it can be cooled externally by air cooling or circulating water cooling. In this embodiment, the static magnetic field radiation device 8 adopts a solenoid structure, with a solenoid inner diameter of 140 mm, the number of wire turns between 2400 - 2500 turns, a total coil resistance of 23.6 Ω, and an inductance of 114 mH. The outer shell and base rail related structures of the static magnetic field radiation device 8 are all made of insulating materials, and the total insulation resistance is greater than 50 MΩ. The current source outputs a direct current of 0.48 A, and the magnetic flux density (magnetic field strength) measured at the center point of the solenoid is 1 mT. When the output current is 4.75 A, the magnetic flux density (magnetic field strength) measured at the center point of the solenoid is 50 mT. Specifically, the magnetic field radiation device 8 includes a base A, a radiation coil B, an orbital support frame C, a current input port D, an orbital support frame support E, a sample transfer orbit F, a screw drive device G, etc.

[0043] The base A is a non-metallic device for fixing the radiation coil B. In a preferred implementation, the insulation impedance is greater than 50 MΩ.

[0044] The radiation coil B is a solenoid, a Helmholtz coil, or a magnetic field emission coil composed of multiple turns of coils. Preferably, a non-ferromagnetic wire with high electrical conductivity and low inductance is selected. In a preferred implementation, the electrical conductivity is greater than 50 S / m.

[0045] The orbital support frame C is a structure fixed inside the static magnetic field radiation device 8 for supporting and transferring the test sample.

[0046] The current input port D is an input interface for the DC power supply, and the direction of the magnetic field can be adjusted by adjusting the positive and negative inputs.

[0047] The orbital auxiliary support frame E is a support structure for the sample transfer orbit F outside the radiation coil B, and its height is consistent with that of the orbital support frame C. In a preferred implementation, the height difference between the orbital auxiliary support frame E and the orbital support frame C is less than 0.2 mm.

[0048] The test sample transfer track F is for installing and transferring the test sample, and is used to achieve the purpose of slowly entering the test area after the test sample is fixedly installed. It can adopt the gear drive method, the manual method, or the stepping motor drive method. A preferred implementation is to adopt the stepping motor drive method.

[0049] The screw drive device G is used to drive the test sample transfer track F to drive along the axis of the static magnetic field radiation device 8, facilitating the transmission of the test sample and changing the direction of the test sample.

[0050] In the static magnetic field radiation device 8, the base A, the track support frame C, the track support frame support E, the sample transfer track F, and the screw drive device G, except for the radiation coil B and the current input port D, are all made of insulating and heat-resistant materials. The dielectric constant of the material < 1.4; the volume deformation is less than 0.1% in the range of -50°C to +200°C.

[0051] The magnetic field calibration fixture 9 is a magnetic field probe positioning device made of insulating materials, which can realize the installation of the probe of the magnetic field meter at different positions. A preferred implementation is that the fixture fixing positions can be set at the center point and the boundary of the uniform field for facilitating the field strength calibration.

[0052] The current warning device 10 is a signal warning device including digital display, sound, and various indicator lights. It is connected to the current monitoring device 5 and the control system 16. The ports can adopt USB, LAN, GPI, etc. When the current monitoring device 5 transmits the current value to the control system 16 through the current warning device 10, after the control system 16 performs diagnostic analysis according to the limit range set by the user, it sends an instruction to the current warning device 10. The current warning device 10 outputs different numerical values, indicator lights, and sound signals according to the instruction.

[0053] The voltage warning device 11 is a signal warning device including digital display, sound, and various indicator lights. It is connected to the voltage monitoring device 5 and the control system 16. The ports can adopt USB, LAN, GPIB, etc. When the voltage monitoring device 5 transmits the voltage value to the control system 16 through the voltage warning device 11, after the control system 16 performs diagnostic analysis according to the limit range set by the user, it sends an instruction to the voltage warning device 11. The voltage warning device 10 outputs different numerical values, indicator lights, and sound signals according to the instruction.

[0054] The temperature warning device 12 includes a signal warning device with digital display, sound, and various indicator lights. It is connected to the temperature monitoring device 5 and the control system 16. The ports can be USB, LAN, GPI, etc. When the temperature monitoring device 5 transmits the temperature value to the control system 16 through the temperature warning device 11, after the control system 16 performs diagnostic analysis based on the limit range set by the user, it sends an instruction to the temperature warning device 11. The temperature warning device 10 outputs different numerical values, indicator lights, and sound signals according to the instruction.

[0055] The magnetic field leakage warning device 13 is a magnetic field leakage warning device outside the static magnetic field radiation device 8. It is used to warn the magnetic flux density (magnetic field intensity) near the static magnetic field radiation device 8 and the magnetic flux density (magnetic field intensity) near the corresponding auxiliary equipment for the test sample to evaluate the magnetic field exposure risk of the auxiliary equipment during the test.

[0056] The temperature monitoring device 14 is used to measure the surface temperature of the static magnetic field radiation device 8 and transmit the data to the control system 16, and the control system 16 performs corresponding protection actions to prevent safety risks caused by excessive surface temperature of the device. A preferred implementation is to use an infrared thermometer with a temperature range greater than 10 - 100 °C. In this embodiment, the temperature monitoring device 14 uses infrared temperature, with a range of 0 - 120 V and an accuracy better than 1 mV.

[0057] The magnetic field exposure monitoring device 15 is used to monitor the magnetic flux density (magnetic field intensity) near the magnetic field radiation device 8 and transmit it to the control system 16. A preferred implementation is to use a millitesla meter with an accuracy of 1% and a minimum resolution of 0.01 mT. A preferred implementation is that the millitesla meter has a communication port for interaction with the customer control system 16. In this embodiment, the magnetic field exposure monitoring device 15 uses a millitesla meter with a range of 0 - 2000 mT and a resolution of 0.01 mT.

[0058] The control system 16 integrates the functions of data acquisition, storage, analysis, and output of current, voltage, temperature, and magnetic field exposure, etc. It can perform monitoring according to the deviation range set according to actual needs. If the relevant monitoring parameters exceed the allowable range, an instruction to turn off the current output is sent to both the current source 1 and the safety protection execution device 2 at the same time. At the same time, the control system 16 also has the function of adjusting the current output value of the current source 1 according to the parameters collected by the test sample performance monitoring device 18. A preferred implementation is that the control system 16 indirectly adjusts the output of the magnetic flux density (magnetic field intensity) by directly controlling the current source 1 or indirectly controlling the DC source through a function generator. Since the linearity of the magnetic field test device in the present utility model can reach 0.6%. Therefore, the field strength deviation after adjustment by the control system 16 is also about 0.6%. A preferred implementation is that the tolerance of the control system 16 is less than 0.1 dB.

[0059] The manual emergency control device 17 is a manually controlled current output shutdown switch for emergency handling of emergencies. In a preferred embodiment, the shutdown response time range of the manual emergency control device 17 is between 20 μs and 50 ms. In the case of realizing a fast switch, transient pulse fields and gradient static magnetic fields generated during the fast switch process are avoided.

[0060] The performance monitoring device 18 for the test sample is used to monitor the output parameters of the test sample and transmit the technical parameters to the control system 16 for adjusting the magnetic flux density (magnetic field strength). It is possible to accurately test the sensitivity field strength of the test sample. The monitored parameters can be parameters such as voltage, current, frequency, pulse width, phase, and light intensity.

[0061] The gaussmeter 19 is a static magnetic field strength measuring device. In a preferred embodiment, the measuring range of the gaussmeter 19 is 0 - 2000 mT. In a preferred embodiment, the accuracy of the gaussmeter 19 is better than 1%, and the minimum resolution is better than 0.01 mT.

[0062] Example 2 - Field Strength Linearity Verification

[0063] Step 1: Calibrate the magnetic field output field strength according to the magnetic field immunity detection device manufactured in Example 1.

[0064] Step 2: Use a millitesla meter to calibrate the field strength linearity at the center point.

[0065] Step 3: Set the current outputs of the DC power supply to 0.05 A, 0.2 A, 0.5 A, 1 A, 2 A, 3 A, 4 A, and 4.75 A respectively. Use a good tesla meter to measure the magnetic field at the center point of the static magnetic field radiation device 8. The corresponding relationship between current and field strength is as Figure 7 shown.

[0066] Step 4: Perform fitting processing on the curve, and the linearity is 2.8%.

[0067] Example 3 - Field Strength Uniformity Verification

[0068] Step 1: Perform uniformity verification of the magnetic field test device according to the Figure 5 shown calibration points.

[0069] Step 2: Place the probe of the millitesla meter at the center point of the magnetic field test device respectively to calibrate the 50 mT magnetic field. When the magnetic flux density (magnetic field strength) reaches within the range of (50 ± 0.02) mT field strength, record the real-time current value of 4.75 A.

[0070] Step 3: Place the magnetic field probe of the millitesla meter at the position of calibration point 1 respectively. The accuracy of the millitesla meter is 1%, and the minimum resolution is 0.01 mT.

[0071] Step 4: The DC power supply outputs a current of 4.75 A in constant current mode, and read the static magnetic flux density (magnetic field strength) at calibration point 1.

[0072] Step 5: Repeat the operations in Step 3 and Step 4. Place the magnetic field probe of the millitesla meter at the positions of calibration point 2, calibration point 3, and calibration point 4 respectively, and record the magnetic field strength values. As shown in Table 1 below.

[0073] Step 6: Calculate the deviations of calibration point 1, calibration point 2, calibration point 3, and calibration point 4 from the center point.

[0074] Step 7: From the data results, it can be seen that the deviation of the uniform domain is 2.8%.

[0075] Table 1 Uniformity calibration results

[0076] Checkpoint Magnetic Flux Density (Magnetic Field Strength) (mT) Center Point 50.01 Checkpoint 1 50.72 Checkpoint 2 48.61 Checkpoint 3 51.04 Checkpoint 4 49.36

[0077] Example 4 - Protection measures

[0078] Step 1: According to Figure 2 the functional protection scheme of the real-time magnetic field test device shown by the logical relationship.

[0079] Step 2: Set the current range of the safety protection execution device 2 to 1% of the output current, and the deviation range is not greater than 0.02 A.

[0080] Step 3: For the test time control device 3, use the unit composed of a timer and a relay to execute the test time control. The control time accuracy is better than 0.1 s. And the relay adopts a soft switch, and the start time is 20 ns - 100 ms to avoid the high-amplitude pulse at the moment of turn-off.

[0081] Step 4: The temperature monitoring device 14 adopts an infrared temperature measuring device. The current and voltage warning ranges set by the control system 16 are greater than 2%, and the shutdown range is greater than 5%. Shut down and output a beeping prompt sound.

[0082] Step 5: When the output magnetic field strength is 50 mT, the rated voltage is 4.75 A, and the actual output current is between 4.655 and 4.835 A (2% deviation). The current warning device 10 receives the instruction from the control system 16 and displays a green indicator light. When the actual output current deviation is between 2% - 5%, the current warning device 10 receives the instruction from the control system 16 and displays a yellow indicator light. When the actual output current deviation is greater than 5%, the current warning device 10 receives the instruction from the control system 16 and displays a red indicator light. The control system 16 shuts off the output of the current source 1, cuts off the safety protection actuator 2, and the current warning device 10 outputs a beeping prompt sound. Similarly, the voltage warning device 11, the temperature warning device 12, the magnetic field leakage warning device 13, the temperature monitoring device 14, and the magnetic field exposure monitoring device 15 are the same as the current warning device 10.

[0083] Step 6: When a safety hazard occurs, the manual emergency control device 17 can be quickly activated to stop the output of the current source.

[0084] Step 7: The current fusing protection device 4 uses a fuse with a rated current of 1.1 - 1.2 times for fusing protection.

[0085] Example 5 - Test Operation

[0086] Step 1: After completing the relevant verifications of Real-time Examples 4 and 5, install the sample on the rail of the static magnetic field radiation device 8.

[0087] Step 2: The safety protection actuator 2 is set according to Example 4, and the test time is set to 1 min.

[0088] Step 3: The current source 1 outputs a DC current of (4.75 ± 0.01) A in the constant current mode. At this time, a 50 mT magnetic field with a uniformity of approximately 2.8% has been generated inside the magnetic field radiation device.

[0089] Step 4: Rotate the adjustment screw drive knob G to move the sample transfer track F along the X-axis of the magnetic field radiation device into the test area.

[0090] Step 5: According to the output parameters or status of the test sample, trigger the shutdown of the DC source by the performance monitoring data.

[0091] Step 6: If the test sample is severely damaged, an emergency manual trigger shutdown can be implemented.

[0092] Step 7: For test samples that are not easily directly damaged under the test conditions of 1 mT magnetic flux density (magnetic field strength), the shutdown of the test device can be triggered by the output parameters of the test sample under the condition of time relay protection.

[0093] Step 8. On the premise of the test requirements, the magnetic field output level of the magnetic field radiation device can be adjusted according to the performance parameters output of the test sample, so as to find the test level that the test sample can actually meet the requirements, which is convenient for the improvement and upgrade of the later products. For example, when the test field strength is 50 mT, the monitoring parameters of the test sample do not meet the requirements; then the control system 16 adjusts the current output of the current source 1 to gradually adjust the magnetic flux density (magnetic field strength) to 45 mT. If the output of the test sample meets the requirements, it is considered that the test sample meets the current test level. Otherwise, continue to gradually reduce the level to find the test level that the test sample meets.

Claims

1. A 50mT static magnetic field immunity detection device, characterized in that, It includes a current source (1), a safety protection execution device (2), a test time control device (3), a current fusing protection device (4), a current monitoring device (5), a voltage monitoring device (6), a current transmission line (7), a static magnetic field radiation device (8), a magnetic field calibration device (9), a current warning device (10), a voltage warning device (11), a temperature warning device (12), a magnetic field leakage warning device (13), a temperature monitoring device (14), a magnetic field exposure monitoring device (15), a control system (16), an artificial emergency control device (17), a monitored subject sample performance monitoring device (18), and a field strength meter (19), wherein: The current source (1), the safety protection execution device (2), the test time control device (3), the current fusing protection device (4), the current monitoring device (5), and the voltage monitoring device (6) are connected in sequence. The voltage monitoring device (6) is connected to the static magnetic field radiation device (8) via the current transmission line (7). The static magnetic field radiation device (8) is connected to the magnetic field calibration device (9) and the field strength meter (19) in sequence. The static magnetic field radiation device (8) is also connected to the temperature monitoring device (14) and the magnetic field exposure monitoring device (15). The temperature monitoring device (14) is connected to the temperature warning device (12). The magnetic field exposure monitoring device (15) is connected to the magnetic field leakage warning device (13). The temperature warning device (12) and the magnetic field leakage warning device (13) are connected to the control system (16). After the current monitoring device (5) is connected to the current warning device (10), it is then connected to the control system (16). After the voltage monitoring device (6) is connected to the voltage warning device (11), it is then connected to the control system (16). The control system (16) is also connected to the current source (1), the safety protection execution device (2), and the monitored subject sample performance monitoring device (18), and the current source (1) is also connected to the artificial emergency control device (17).

2. The 50mT static magnetic field immunity detection device according to claim 1, wherein The current source (1) uses a programmable DC source with a constant current mode, and the current accuracy is better than 1 mA.

3. A 50mT static magnetic field immunity detection device according to claim 1, characterized in that, The test time control device (3) uses a high-precision digital switch, and the turn-off time of the digital switch is maintained between 10 μs and 10 ms.

4. A 50mT static magnetic field immunity detection device according to claim 1, characterized in that, The static magnetic field radiation device (8) includes a base (A), a radiation coil (B), a track support frame (C), a current input port (D), a track support frame support (E), a sample transfer track (F), and a screw drive device (G). Among them, the radiation coil (B) is arranged on the base (A). The track support frame (C) is supported on the base (A) through the track support frame support (E). A sample transfer track (F) driven by the screw drive device (G) is arranged in the radiation coil (B). The radiation coil (B) is connected to the current input port (D).

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