Tester of portable high-voltage electricity testing rod and implementation process

Abstract

The invention relates to the technical field of testing of power equipment, in particular to a tester of a portable high-voltage electricity testing rod and an implementation process. According to the technical scheme, the tester of the portable high-voltage electricity testing rod comprises a plastic L-shaped shell, a photoelectric sensor and an electro-acoustic sensor are arranged at the head position of the first side of the L-shaped shell in a left-right symmetry mode, a high-voltage source is arranged in front of the photoelectric sensor and the electro-acoustic sensor, and the photoelectric sensor and the electro-acoustic sensor are connected with the plastic L-shaped shell. A high-voltage spray point is arranged in front of the high-voltage source, a power source is arranged at the bottom of the second side of the L-shaped shell, a screen is arranged on the upper portion of the rear side face of the second side of the L-shaped shell, a loudspeaker is arranged on the lower portion of the rear side face of the second side of the L-shaped shell, and a control button is arranged between the loudspeaker and the screen. Real-time voltage is obtained through a special calculation method, high-voltage sampling is not needed, and the complexity of the device is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of testing electric equipment, and in particular to a tester of a portable high-voltage electric test rod and an implementation process thereof. Background Art

[0002] A high-voltage tester is a device used to detect voltage levels. When it is close to a high-voltage power supply, it will sound and light alarms. The inspection of capacitive high-voltage sound and light testers is based on the starting voltage test of electrical appliances in accordance with the requirements of the power system and product safety. It mainly tests the starting voltage of the instrument part by performing an equivalent voltage boost at 0.15-0.4 times the rated voltage. However, existing test equipment is often large in size and complex to operate, making it difficult to meet daily portability requirements. Summary of the invention

[0003] In order to solve the defects of the prior art, the present invention provides a tester for a portable high-voltage electric test rod and an implementation process.

[0004] To achieve the above object, the present invention is implemented by the following technical solutions: The present invention proposes a portable high-voltage electric test rod tester, comprising a plastic L-shaped shell, a photoelectric sensor and an electroacoustic sensor are symmetrically arranged at the head position of the first side of the L-shaped shell, a high-voltage source is arranged in front of the photoelectric sensor and the electroacoustic sensor, a high-voltage discharge needle is arranged in front of the high-voltage source, a power supply is arranged at the bottom of the second side of the L-shaped shell, a screen is arranged at the upper position of the rear side surface of the second side of the L-shaped shell, a speaker is arranged at the lower position of the rear side surface of the second side of the L-shaped shell, and a control button is arranged between the speaker and the screen.

[0005] According to the tester of a portable high-voltage test rod, a touch switch is provided at the front position of the lower side surface of the first side of the L-shaped shell; snap interfaces are symmetrically provided at the front positions of the left and right sides of the first side of the L-shaped shell; and an operation button is provided at the middle position of the front side surface of the second side of the L-shaped shell.

[0006] According to the portable high-voltage test rod tester, the screen is used to display the voltage level and alarm status; the control button is used to adjust the system settings; the speaker uses a low-frequency speaker whose sound frequency does not overlap with the sound frequency of the high-voltage test rod, and is used to issue prompt sounds and work warnings.

[0007] According to the tester of the portable high-voltage electric test rod, it also includes a high-voltage protective cover, and a buckle is provided in the middle part of the high-voltage protective cover, and the high-voltage protective cover can be installed on the tester through the buckle and the bayonet interface.

[0008] According to the portable high-voltage electric test rod tester, the high-voltage source uses a resonant transformer to generate high-frequency high voltage, and is located at the head position of the first side of the L-shaped shell.

[0009] According to the portable high-voltage electric tester tester, the power source uses lithium-ion batteries connected in series, with a charging and discharging integrated balancing protection board, to provide a DC power supply for the entire system.

[0010] According to the tester of the portable high-voltage electric test stick, it also includes a control circuit, and the control circuit includes an STM32F407 single-chip microcomputer and a DC voltage regulator module; The power supply of the STM32F407 single-chip microcomputer module is stepped down to the working voltage by the DC voltage regulator module; The STM32F407 microcontroller uses TC4420 to control the switch state of the IRF3205 N-channel power field effect transistor (MOSFET) connected to the primary coil, thereby controlling the high voltage generated by the self-excited oscillator; The STM32F407 microcontroller controls the UC1525B pulse width modulator to generate a PWM signal, and then controls the high voltage generated by the resonant transformer by controlling the switching state of the IRF3205 MOSFET and changing the voltage of the primary coil.

[0011] According to the tester of a portable high-voltage test rod, the photoelectric sensor and the electroacoustic sensor are APDS-9253 001 photoelectric sensor and SPH0641LU4H-1 electroacoustic sensor respectively, which are connected through the GPIO port of the single-chip computer, and the sound and light frequencies emitted by the high-voltage test rod are separated through a filter to monitor whether the high-voltage test rod emits a sound and light alarm.

[0012] According to the implementation process of the tester of the portable high-voltage electric test rod, the following steps are included: Step 1, mix the two-component JH5539 epoxy resin, mix them thoroughly at room temperature, put them into the vacuum operation box together with the resonant transformer coil after thorough mixing, the mixing time shall not exceed 2 minutes, and the vacuum shall be completed within 8 minutes after mixing. It should be thoroughly mixed, and the coil shall not be cast at this time. The sign of vacuuming completion is that there are no bubbles in the epoxy resin and the vacuum degree is greater than -100kPa; Step 2, slowly introduce SF6 into the vacuum operation box until it reaches one tenth of the atmospheric pressure, that is, 0.1 atmosphere. When the mixing is completed for 25-30 minutes or the viscosity is greater than 200CS, use a heater to heat the epoxy resin to 60 degrees Celsius, use a microporous foaming nozzle, and the bubble diameter is between 0.05-0.1mm. The microporous foaming nozzle introduces SF6 inside for foaming, and the atmospheric pressure of the vacuum operation box is maintained continuously. The fluctuation shall not exceed plus or minus 20%. When the foaming volume reaches 18 times the original epoxy resin volume, maintain heating at 60 degrees, and slowly cast the coil. After the first casting is completed, slowly introduce SF6 to increase the atmospheric pressure to 0.5 atmosphere, and cast again. Continue to introduce SF6 until the atmospheric pressure is equal to the pressure, and complete the last casting; the above total time shall not exceed 15 minutes, and heating shall be stopped after casting is completed; Step 3, let the coil module stand for three hours, take out the number after completion, and number the resonant transformer; then carry out the withstand voltage test and quality inspection, measure the Q value after the quality inspection, laser mark the shell, and set the factory parameters of each instrument according to the marking information; Step 4, calculate the voltage. The STM32F407 microcontroller is used to control the duty cycle of the PWM signal to D, thereby adjusting the average voltage V1_avg of the primary coil (V1_avg = D * V1_max). The voltage V2 of the secondary coil (high voltage source) is determined by the voltage V1_avg of the primary coil, the turns ratio of the coil (N2 / N1), the Q value of the coil, and the compensation coefficient Kr. The turns ratio of the coil refers to the ratio of the turns N2 of the secondary coil to the turns N1 of the primary coil. The Q value of the coil is determined by the physical properties of the coil itself, and the compensation coefficient Kq is calculated from the Q value, Kq = Q / (Q + 1); Kq is a compensation coefficient between 0 and 1, and its function is to convert the Q value into a coefficient that can be directly used for voltage calculation.

[0013] The calculation process of the secondary coil voltage V2 is as follows: (V2 = V1_avg * (N2 / N1) * Q / (Q + 1) * Kr Among them, the Kr compensation coefficient function is a bell-shaped curve, corresponding to the normal distribution, and its shape is determined by its mean μ and standard deviation σ. Therefore, the compensation coefficient Kr can be expressed as: Kr(D) = exp(-(D - μ)^2 / (2 * σ^2)) Where exp() is an exponential function, D is the PWM duty cycle, μ is the duty cycle at which the resonant transformer reaches the maximum voltage, and σ is the standard deviation; In this case, the compensation coefficient Kr is a function based on the duty cycle D. When D=μ, Kr reaches its maximum, that is, 1. Therefore, μ needs to be set to the duty cycle that makes the resonant transformer reach the maximum voltage. σ determines the width of the bell curve, that is, the rate of decrease of Kr when the duty cycle D deviates from μ. The selection of σ needs to be weighed according to the characteristics of the resonant transformer and the demand for voltage control accuracy. Each tester will be calibrated before leaving the factory and entered into the firmware.

[0014] The final output voltage V2 is calculated as: V2 = V1_avg * (N2 / N1) * Kq * Kr(D) In the above formula, V1_avg is the average voltage of the primary coil, N1 is the number of turns of the primary coil, N2 is the number of turns of the secondary coil, Q is the Q value of the coil, and Kr is the compensation coefficient. Through this formula, the voltage of the secondary coil is calculated according to the voltage of the primary coil, the turns ratio of the coil, the Q value and the compensation coefficient Kr; The single chip microcomputer gradually increases the voltage according to the calculation results, and the speed of increase can be adjusted by setting the button; Step 5, the STM32F407 MCU displays the calculated voltage on the screen and monitors its alarm status in real time. When the sound and light sensor detects that the high-voltage test rod emits an sound and light alarm, the MCU immediately records the current voltage and controls the buzzer to sound an alarm.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention obtains real-time voltage through a special calculation method, without the need for high-voltage sampling, thus reducing the complexity of the device.

[0016] 2. The present invention meets the requirements of portability and high accuracy, and can accurately read and display the current voltage level at the moment when the high-voltage voltage test rod emits an audible and visual alarm. Its practicality and operability have been significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] A patent application entitled "A portable high-voltage test rod tester and implementation process" includes six drawings in its specification, and the drawings of these drawings are described as follows.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the tester of the present invention; Figure 2 is a front view of the tester of the present invention; Figure 3 is a side view of the tester of the present invention; Figure 4 is a top view of the tester of the present invention; Figure 5It is a schematic diagram of the three-dimensional structure of the high-voltage protective cover of the present invention; Figure 6 It is a schematic diagram of the circuit structure of the present invention.

[0019] In the figure: 1. L-shaped shell, 101. first side of L-shaped shell, 102. second side of L-shaped shell, 2. photoelectric sensor, 3. electroacoustic sensor, 4. high voltage source, 5. high voltage discharge needle, 6. screen, 7. speaker, 8. control button, 9. touch switch, 10. buckle interface, 11. operation button, 12. high voltage protective cover, 13. buckle. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] like Figure 1-6 As shown, the present invention provides a technical solution: like Figure 1-4 As shown, a portable high-voltage electric test stick tester includes a plastic L-shaped shell 1, a photoelectric sensor 2 and an electroacoustic sensor 3 are symmetrically arranged at the head position of the first side 101 of the L-shaped shell, the photoelectric sensor 2 and the electroacoustic sensor 3 are respectively an APDS-9253001 photoelectric sensor and an SPH0641LU4H-1 electroacoustic sensor, which are connected through the GPIO port of the single-chip microcomputer, and the sound and light frequencies emitted by the high-voltage electric test stick are separated through a filter to monitor whether the high-voltage electric test stick emits an sound and light alarm, a high-voltage source 4 is arranged in front of the photoelectric sensor 2 and the electroacoustic sensor 3, and the high-voltage source 4 uses a resonant transformer to generate high frequency and high voltage, and is located at the head position of the first side 101 of the L-shaped shell, and the front of the high-voltage source 4 A high-voltage discharge needle 5 is provided on the side, a power supply is provided at the bottom of the second side 102 of the L-shaped shell, a screen 6 is provided at the upper position of the rear side surface of the second side 102 of the L-shaped shell, and the screen 6 is used to display the voltage level and alarm status; a speaker 7 is provided at the lower position of the rear side surface of the second side 102 of the L-shaped shell, and the speaker 7 uses a low-frequency speaker whose sound frequency does not overlap with the sound frequency of the high-voltage test rod, and is used to issue prompt sounds and work warnings. A control button 8 is provided between the speaker 7 and the screen 6, and the control button 8 is used to adjust the system settings; a touch switch 9 is provided at the front position of the lower side surface of the first side 101 of the L-shaped shell, and buckle interfaces 10 are symmetrically provided at the front positions of the left and right sides of the first side 101 of the L-shaped shell, and an operation button 11 is provided in the middle position of the front side surface of the second side 102 of the L-shaped shell.

[0022] like Figure 1As shown in or 5 , it also includes a high-voltage protective cover 12 , and a buckle 13 is provided in the middle part of the high-voltage protective cover 12 , and the high-voltage protective cover 12 can be installed on the tester through the buckle 13 and the bayonet interface 10 .

[0023] like Figure 6 As shown, it also includes a control circuit, which includes an STM32F407 single-chip microcomputer and a DC voltage regulator module; The power supply of the STM32F407 MCU module is stepped down to the working voltage by the DC voltage regulator module; The STM32F407 microcontroller uses TC4420 to control the switch state of the IRF3205 N-channel power field effect transistor (MOSFET) connected to the primary coil, thereby controlling the high voltage generated by the self-excited oscillator; The STM32F407 microcontroller controls the UC1525B pulse width modulator to generate a PWM signal, and then controls the high voltage generated by the resonant transformer by controlling the switching state of the IRF3205 MOSFET and changing the voltage of the primary coil.

[0024] A process for implementing a portable high-voltage electric probe tester comprises the following steps: The following steps need to be carried out in a vacuum operating box, which is also known as a vacuum glove box and is a well-known device that can perform delicate operations under vacuum.

[0025] Step 1, mix the two-component JH5539 epoxy resin, mix them thoroughly at room temperature, put them into the vacuum operation box together with the resonant transformer coil after thorough mixing, the mixing time shall not exceed 2 minutes, and the vacuum shall be completed within 8 minutes after mixing. It should be thoroughly mixed, and the coil shall not be cast at this time. The sign of vacuuming completion is that there are no bubbles in the epoxy resin and the vacuum degree is greater than -100kPa; Step 2, slowly introduce SF6 into the vacuum operation box until it reaches one tenth of the atmospheric pressure, that is, 0.1 atmosphere. When the mixing is completed for 25-30 minutes or the viscosity is greater than 200CS, use a heater to heat the epoxy resin to 60 degrees Celsius, use a microporous foaming nozzle, and the bubble diameter is between 0.05-0.1mm. The microporous foaming nozzle introduces SF6 inside for foaming, and the atmospheric pressure of the vacuum operation box is continuously maintained. The fluctuation shall not exceed plus or minus 20%. When the foaming volume reaches 18 times the original epoxy resin volume, maintain heating at 60 degrees, and slowly cast the coil. After the first casting is completed, slowly introduce SF6 to increase the atmospheric pressure to 0.5 atmosphere, and cast again. Continue to introduce SF6 until the atmospheric pressure is equal to the pressure, and complete the last casting; the above total time shall not exceed 15 minutes, and heating shall be stopped after casting is completed; Step 3, let the coil module stand for three hours, take out the number after completion, and number the resonant transformer; then carry out voltage resistance test and quality inspection, measure the Q value after the quality inspection, laser mark the shell, and set the factory parameters of each instrument according to the marking information.

[0026] Step 4, the high-voltage discharge needle (5) is close to the high-voltage power supply, and the voltage is calculated. The STM32F407 microcontroller is used to control the duty cycle of the PWM signal to D, thereby adjusting the average voltage V1_avg of the primary coil (V1_avg = D * V1_max). The voltage V2 of the secondary coil (high-voltage source) is determined by the voltage V1_avg of the primary coil, the turns ratio of the coil (N2 / N1), the Q value of the coil, and the compensation coefficient Kr. The turns ratio of the coil refers to the ratio of the number of turns N2 of the secondary coil to the number of turns N1 of the primary coil. The Q value of the coil is determined by the physical properties of the coil itself, and the compensation coefficient Kq is calculated from the Q value, Kq = Q / (Q +1) (Q value (Quality factor) is a parameter that describes the frequency characteristics of components such as inductors and capacitors. The larger this value, the better the frequency selectivity of the inductor or capacitor, that is, the stronger the response to a specific frequency.); Kq is a compensation coefficient between 0 and 1, and its function is to convert the Q value into a coefficient that can be directly used for voltage calculation.

[0027] When the Q value is very large (that is, the quality of the coil is very high), Kq will be close to 1; when the Q value is very small (the quality of the coil is low), Kq will be close to 0. This compensation coefficient can integrate the quality factor of the coil into the voltage calculation, so that the voltage calculation result can better reflect the actual situation.

[0028] The calculation process of the secondary coil voltage V2 is as follows: (V2 = V1_avg * (N2 / N1) * Q / (Q + 1) * Kr Among them, the Kr compensation coefficient function is a bell-shaped curve, corresponding to the normal distribution, and its shape is determined by its mean μ and standard deviation σ. Therefore, the compensation coefficient Kr can be expressed as: Kr(D) = exp(-(D - μ)^2 / (2 * σ^2)) Where exp() is an exponential function, D is the PWM duty cycle, μ is the duty cycle at which the resonant transformer reaches the maximum voltage, and σ is the standard deviation; In this case, the compensation coefficient Kr is a function based on the duty cycle D. When D=μ, Kr reaches its maximum, that is, 1. Therefore, μ needs to be set to the duty cycle that makes the resonant transformer reach the maximum voltage. σ determines the width of the bell curve, that is, the rate of decrease of Kr when the duty cycle D deviates from μ. The selection of σ needs to be weighed according to the characteristics of the resonant transformer and the demand for voltage control accuracy. Each tester will be calibrated before leaving the factory and entered into the firmware.

[0029] The final output voltage V2 is calculated as: V2 = V1_avg * (N2 / N1) * Kq * Kr(D) In the above formula, V1_avg is the average voltage of the primary coil, N1 is the number of turns of the primary coil, N2 is the number of turns of the secondary coil, Q is the Q value of the coil, and Kr is the compensation coefficient. Through this formula, the voltage of the secondary coil is calculated according to the voltage of the primary coil, the turns ratio of the coil, the Q value and the compensation coefficient Kr; The single chip microcomputer gradually increases the voltage according to the calculation results, and the speed of increase can be adjusted by setting the button; The present invention obtains real-time voltage through a special calculation method, does not need to perform high-voltage sampling, and reduces the complexity and portability of the device.

[0030] Step 5, the STM32F407 MCU displays the calculated voltage on the screen and monitors its alarm status in real time. When the sound and light sensor detects that the high-voltage test rod emits an sound and light alarm, the MCU immediately records the current voltage and controls the buzzer to sound an alarm.

[0031] During the specific use process, to ensure safety, the operator wears insulating gloves that meet the requirements, wears insulating shoes, and operates in a dry environment. Before the test begins, turn on the instrument. When it is turned on, it will self-check and sound to confirm that its sound and light indication is normal. Then bring the sensing area of ​​the instrument close to the tested electric rod, press the test button while maintaining the rated distance, and observe when the sound and light prompts appear on the electric rod. Its rated distance is determined according to the response sensitivity distance of the tested electric rod manual. If the test is the sensitivity of the highest voltage of the electric rod, its distance should meet the longest sensing distance of the highest voltage of the electric rod. A video recording device should be used to record in real time during the process to ensure that the test results are controlled. By adjusting the voltage, check whether the sensitivity and starting voltage of the electric rod meet the standards. If there is no sound and light indication, it means that the electric rod may be abnormal. After completing the test, the tester and the electric rod should be properly returned to their original positions, wipe the surface dust, and store them in a dry and ventilated environment. Regularly inspect the tester according to the requirements of the user manual to ensure its reliable performance.

[0032] According to the above design, the present invention meets the requirements of portability and high accuracy, and can accurately read and display the current voltage level at the moment when the high-voltage voltage test rod emits an audible and visual alarm. Its practicality and operability are significantly improved.

[0033] The above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned implementation cases, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A portable high-voltage tester, characterized in that: The invention comprises an L-shaped shell (1), wherein a photoelectric sensor (2) and an electroacoustic sensor (3) are symmetrically arranged at the front end of the upper horizontal structure of the L-shaped shell, a high voltage source (4) is arranged in front of the photoelectric sensor (2) and the electroacoustic sensor (3), a high voltage discharge needle (5) is arranged in front of the high voltage source (4), a power supply is arranged at the bottom of the lower vertical structure of the L-shaped shell, a screen (6) is arranged at the upper position of the rear side surface of the second side (102) of the L-shaped shell, a speaker (7) is arranged at the lower position of the screen (6), and a control button (8) is arranged between the speaker (7) and the screen (6); It also includes a control circuit, which includes an STM32F407 single-chip microcomputer and a DC voltage regulator module. The power supply of the STM32F407 single-chip microcomputer module is stepped down to the working voltage by the DC voltage regulator module; the STM32F407 single-chip microcomputer uses TC4420 to control the switch state of the IRF3205 N-channel power field effect transistor (MOSFET) connected to the primary coil, thereby controlling the high voltage generated by the self-excited oscillator; the STM32F407 single-chip microcomputer controls the UC1525B pulse width modulator to generate a PWM signal, and then controls the switch state of the IRF3205 MOSFET and changes the voltage of the primary coil to control the high voltage generated by the resonant transformer. The photoelectric sensor (2) and the electroacoustic sensor (3) are respectively an APDS-9253001 photoelectric sensor and an SPH0641LU4H-1 electroacoustic sensor, which are connected through the GPIO port of the single-chip microcomputer, and the sound and light frequency emitted by the high-voltage electric test stick is separated by a filter to monitor whether the high-voltage electric test stick emits an sound and light alarm.

2. A portable high-voltage tester according to claim 1, characterized in that: A touch switch (9) is provided at the front position of the lower side surface of the first side (101) of the L-shaped shell; buckle interfaces (10) are symmetrically provided at the front positions of the left and right side surfaces of the first side (101) of the L-shaped shell; and an operation button (11) is provided at the middle position of the front side surface of the second side (102) of the L-shaped shell.

3. A portable high-voltage tester according to claim 1, characterized in that: The screen (6) is used to display the voltage level and the alarm status; the control button (8) is used to adjust the system settings; the speaker (7) is a low-frequency speaker whose sound frequency does not overlap with the sound frequency of the high-voltage test rod, and is used to issue a prompt sound and a work warning.

4. A portable high-voltage test rod tester according to claim 1 or 2, characterized in that: It also comprises a high-voltage protective cover (12), wherein a buckle (13) is provided at the middle portion of the high-voltage protective cover (12), and the high-voltage protective cover (12) can be mounted on the tester via the buckle (13) and the bayonet interface (10).

5. A portable high-voltage tester according to claim 1, characterized in that: The high-voltage source (4) uses a resonant transformer to generate high-frequency high voltage, and is located at the head of the first side (101) of the L-shaped housing.

6. A portable high-voltage tester according to claim 1, characterized in that 。 7. A portable high-voltage tester according to claim 1, characterized in that 。 8. The implementation process of the portable high-voltage test rod tester according to any one of claims 1 to 7, characterized in that: The manufacturing steps include: Step 1, mix the two-component JH5539 epoxy resin, mix them thoroughly at room temperature, put them into the vacuum operation box together with the resonant transformer coil after thorough mixing, the mixing time shall not exceed 2 minutes, and the vacuum shall be completed within 8 minutes after mixing. It should be thoroughly mixed, and the coil shall not be cast at this time. The sign of vacuuming completion is that there are no bubbles in the epoxy resin and the vacuum degree is greater than -100kPa; Step 2, slowly introduce SF6 into the vacuum operation box until it reaches one tenth of the atmospheric pressure, that is, 0.1 atmosphere. When the mixing is completed for 25-30 minutes or the viscosity is greater than 200CS, use a heater to heat the epoxy resin to 60 degrees Celsius, use a microporous foaming nozzle, and the bubble diameter is between 0.05-0.1mm. The microporous foaming nozzle introduces SF6 inside for foaming, and the atmospheric pressure of the vacuum operation box is continuously maintained. The fluctuation shall not exceed plus or minus 20%. When the foaming volume reaches 18 times the original epoxy resin volume, maintain heating at 60 degrees, and slowly cast the coil. After the first casting is completed, slowly introduce SF6 to increase the atmospheric pressure to 0.5 atmosphere, and cast again. Continue to introduce SF6 until the atmospheric pressure is equal to the pressure, and complete the last casting; the above total time shall not exceed 15 minutes, and heating shall be stopped after casting is completed; Step 3, let the coil module stand for three hours, take out the number after completion, and number the resonant transformer; then carry out the withstand voltage test and quality inspection, measure the Q value after the quality inspection, laser mark the shell, and set the factory parameters of each instrument according to the marking information; It also includes the following high voltage test steps: Step 1, the high-voltage discharge needle (5) is close to the high-voltage power supply, and the voltage is calculated. The STM32F407 microcontroller is used to control the duty cycle of the PWM signal to D, thereby adjusting the average voltage V1_avg of the primary coil (V1_avg = D * V1_max). The voltage V2 of the secondary coil (high-voltage source) is determined by the voltage V1_avg of the primary coil, the turns ratio of the coil (N2 / N1), the Q value of the coil, and the compensation coefficient Kr. The turns ratio of the coil refers to the ratio of the turns N2 of the secondary coil to the turns N1 of the primary coil. The Q value of the coil is determined by the physical properties of the coil itself, and the compensation coefficient Kq is calculated from the Q value, Kq = Q / (Q + 1); Kq is a compensation coefficient between 0 and 1, which is used to convert the Q value into a coefficient that can be directly used for voltage calculation; The calculation process of the secondary coil voltage V2 is as follows: (V2 = V1_avg * (N2 / N1) * Q / (Q + 1) * Kr Among them, the Kr compensation coefficient function is a bell-shaped curve, corresponding to the normal distribution, and its shape is determined by its mean μ and standard deviation σ. Therefore, the compensation coefficient Kr can be expressed as: Kr(D) = exp(-(D - μ)^2 / (2 * σ^2)) Where exp() is an exponential function, D is the PWM duty cycle, μ is the duty cycle at which the resonant transformer reaches the maximum voltage, and σ is the standard deviation; In this case, the compensation coefficient Kr is a function based on the duty cycle D. When D=μ, Kr reaches its maximum, that is, 1. Therefore, μ needs to be set to the duty cycle that makes the resonant transformer reach the maximum voltage. σ determines the width of the bell curve, that is, the rate of decrease of Kr when the duty cycle D deviates from μ. The selection of σ needs to be weighed according to the characteristics of the resonant transformer and the demand for voltage control accuracy. The final output voltage V2 is calculated as: V2 = V1_avg * (N2 / N1) * Kq * Kr(D) In the above formula, V1_avg is the average voltage of the primary coil, N1 is the number of turns of the primary coil, N2 is the number of turns of the secondary coil, Q is the Q value of the coil, and Kr is the compensation coefficient. Through this formula, the voltage of the secondary coil is calculated according to the voltage of the primary coil, the turns ratio of the coil, the Q value and the compensation coefficient Kr; The single chip microcomputer gradually increases the voltage according to the calculation results, and the speed of increase can be adjusted by setting the button; Step 2, the STM32F407 microcontroller displays the calculated voltage on the screen and monitors its alarm status in real time. When the sound and light sensor detects that the high-voltage test rod emits an sound and light alarm, the microcontroller immediately records the current voltage and controls the buzzer to sound an alarm.

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