Lightning suppressor tester

Abstract

A lightning suppressor tester disclosed by the present invention comprises a power supply unit, a control unit, a signal acquisition unit, an output switching unit and a display unit, the power supply unit is respectively connected with the control unit, the signal acquisition unit and the output switching unit, and the control unit is respectively connected with the display unit and the signal acquisition unit. The signal acquisition unit is connected with the output switching unit, and the output switching unit is connected with a tested piece; the signal acquisition unit comprises a high-voltage voltage signal acquisition circuit and a low-voltage current signal acquisition circuit; according to the invention, a milliampere current signal and a DC input voltage signal on the lightning suppressor are detected in real time; detecting whether the lightning suppressor is still protected after the aircraft is struck by lightning; and testing of other thunder and lightning suppressors in a test parameter range is satisfied. By means of the embedded technology, full-automatic testing can be achieved, equipment damage and personnel damage caused by manual misoperation are avoided, automatic detection is convenient and fast, all modules in the machine can be self-detected, and completeness of the modules is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of testers, and in particular to a lightning suppressor tester. Background Art

[0002] Aircraft lightning suppressor tester is a performance detection device developed for lightning suppressors of various aircraft. According to the characteristics of functional components with different performances in various lightning suppressors, such as gas discharge tubes, varistors, TVS (Transient Voltage Suppressor), etc., the lightning suppressor tester adopts different test methods to detect their performance and gives test results to determine the reliability of the components, thereby providing a certain basis for the airworthiness requirements of the aircraft and ensuring the safety of the aircraft. In the existing lightning suppressor tester, one method used in the high-voltage acquisition circuit is an acquisition circuit based on a voltage transformer and an operational amplifier, and a voltage transformer with a suitable change is selected, such as a voltage transformer with a ratio of 400V:10V. The disadvantages of this type of circuit are: the voltage transformer has no protection measures to suppress high voltage electricity (lightning protection, surge absorption); the rectifier circuit must be designed at the output of the voltage transformer, and the circuit design is cumbersome; the volume is large and the price is high. Another method is the acquisition circuit design based on the voltage acquisition chip. The structure of the front-end voltage divider circuit + isolation and protection circuit + voltage acquisition chip is adopted. The circuit adopts the circuit design of optocoupler isolation, which can effectively isolate the electrical connection between the high-voltage side and the low-voltage side to prevent the high voltage from damaging the acquisition chip, but it cannot prevent the damage of the optocoupler circuit by external lightning high voltage. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a lightning suppressor tester.

[0004] The objective of the present invention is achieved through the following technical solutions: The present invention discloses a lightning suppressor tester, comprising a power supply unit, a control unit, a signal acquisition unit, an output switching unit and a display unit, wherein the power supply unit is respectively connected to the control unit, the signal acquisition unit and the output switching unit, the control unit is respectively connected to the display unit and the signal acquisition unit, the signal acquisition unit is connected to the output switching unit, and the output switching unit is connected to a device under test; The signal acquisition unit includes a high-voltage voltage signal acquisition circuit and a low-voltage current signal acquisition circuit. The low-voltage current signal acquisition circuit includes a sampling circuit, a TVS protection circuit, an operational amplifier circuit and a voltage acquisition chip. The output end of the sampling circuit is connected to the input end of the operational amplifier circuit. The input end of the operational amplifier circuit is also connected to the output end of the TVS protection circuit. The output end of the operational amplifier circuit is connected to the voltage acquisition chip. The operational amplifier circuit includes a first operational amplifier. The sampling circuit includes a sampling resistor. The TVS protection circuit includes a first TVS tube and a second TVS tube. The first TVS tube and the second TVS tube are connected in series and then connected in parallel at both ends of the sampling resistor. The sampling resistor is connected in series with the first resistor and then connected to the positive input end of the first operational amplifier. The negative input end of the first operational amplifier is connected to the output end. The high-voltage voltage signal acquisition circuit includes a voltage divider circuit, a TVS protection circuit, an operational amplifier circuit and a voltage acquisition chip. The output end of the voltage divider circuit is connected to the input end of the operational amplifier circuit, the input end of the operational amplifier circuit is also connected to the output end of the TVS protection circuit, and the output end of the operational amplifier circuit is connected to the voltage acquisition chip; the operational amplifier circuit includes a second operational amplifier, and the TVS protection circuit includes a second resistor, a third resistor, a third TVS tube and a fourth TVS tube. One end of the second resistor is connected to the positive input end of the second operational amplifier, and the third resistor, the third TVS tube and the fourth TVS tube connected in series in sequence are also connected to the common point thereof. The negative input end of the second operational amplifier is connected to its output end.

[0005] Furthermore, the output ends of the high-voltage voltage signal acquisition circuit and the low-voltage current signal acquisition circuit are connected to a conversion module.

[0006] Further, a ±15VDC power supply is output through a first DC-DC power supply module, a second pin of the first DC-DC power supply module is connected to an input power supply, a first pin of the first DC-DC power supply module is grounded, a second capacitor C5 and a third capacitor C6 are respectively connected in parallel to the first pin and the second pin of the first DC-DC power supply module, a sixth pin of the first DC-DC power supply module is connected to a +15V power output, an eighth pin of the first DC-DC power supply module is connected to a -15V power output, a seventh pin of the first DC-DC power supply module is connected to a voltage reference point, a first capacitor C3 is connected in parallel between the seventh pin and the sixth pin of the first DC-DC power supply module, and a fourth capacitor C7 is connected in parallel between the seventh pin and the eighth pin of the first DC-DC power supply module; A 5VDC power supply is output through a second DC-DC power supply module, a first pin of the second DC-DC power supply module is grounded, a second pin of the second DC-DC power supply module is connected to a power input, a sixth capacitor C11 and a seventh capacitor C12 are connected in parallel between the first pin and the second pin of the second DC-DC power supply module, a sixth pin of the second DC-DC power supply module is connected to a 5V power output, a seventh pin of the second DC-DC power supply module is connected to a voltage reference point, an eighth pin of the second DC-DC power supply module is connected in series with an eighth capacitor C13 and then connected to the seventh pin, and a fifth capacitor C10 is connected in parallel between the sixth pin and the seventh pin of the second DC-DC power supply module; Output 3.3VDC power through the voltage regulator module; The high voltage power is outputted through the third DC-DC power module, and the output pin of the third DC-DC power module is connected to the output voltage after being connected in series with a fourth resistor.

[0007] Preferably, the power supply unit further comprises a fuse and a switching power supply, and the fuse is connected to the switching power supply and the third DC-DC power supply module respectively.

[0008] Furthermore, the control unit includes a controller module, which is provided with an output interface, a serial port and an indicator light interface. The output interface is connected to the relay for switching when the DC voltage output range is less than or equal to 400V. The serial port is connected to the signal conversion module for high-voltage control of the power module output and voltage and current recovery. The indicator light interface is connected to the working indicator light.

[0009] Furthermore, the display unit is an intelligent liquid crystal color screen, and the working state is switched by touching.

[0010] Furthermore, the output switching unit is also connected to a lightning suppressor characteristic voltage test circuit, which includes a transistor array module, wherein the first to eighth pins of the transistor array module are connected to the input end, the ninth pin is grounded, the tenth pin is connected to the power supply, and the eleventh to eighteenth pins are connected to the output end, and the switching unit is a double-pole double-throw relay, and the double contacts reduce the contact resistance and improve the reliability.

[0011] The beneficial effects of the present invention are: 1) The lightning suppressor tester of the present invention can provide the lightning suppressor with the working power required for testing, detect the mA current signal and DC input voltage signal on the lightning suppressor in real time, detect whether the lightning suppressor still protects the aircraft after the aircraft is struck by lightning, and meet the test parameters of other lightning suppressors within the test parameter range.

[0012] 2) The present invention can realize fully automatic testing by relying on embedded technology, avoiding equipment damage and personnel damage caused by human error operation, automatic detection, convenient and fast, and can self-check each module in the machine to ensure its own integrity; it has a self-checking function, which can realize self-checking and calibration of the lightning suppressor tester to ensure the integrity of the equipment function; it has a touch screen design, a friendly human-machine interface, easy operation and intuitive display.

[0013] 3) The high-voltage voltage signal acquisition circuit of the present invention includes a voltage divider circuit, a TVS protection circuit, an operational amplifier circuit and a voltage acquisition chip. The TVS protection circuit is innovatively added. The TVS tube uses the TVS6.8CA series with a breakdown voltage of 6.8V. Two TVS tubes are selected in series with a breakdown voltage of 13.6V. The protection circuit is suitable for lightning protection and surge absorption due to its fast response speed (PS level), high transient power, low clamping voltage, and accurate voltage. When the sampling circuit is damaged or there is an impact voltage high voltage entering, the TVS tube will reduce the voltage to 13.6V to prevent damage to the subsequent circuit. The circuit has a simple structure, is stable and reliable, can effectively collect high voltage voltage and current, and is economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic structural diagram of a lightning suppressor tester according to an embodiment of the present invention; Figure 2 A physical diagram of a switching power supply according to an embodiment of the present invention; Figure 3 is a circuit diagram of a power module according to an embodiment of the present invention; Figure 4 A circuit diagram of a high-voltage power supply module according to an embodiment of the present invention; Figure 5 is a circuit diagram of a control unit according to an embodiment of the present invention; Figure 6 is a schematic diagram of a display unit according to an embodiment of the present invention; Figure 7 is a circuit diagram of a high voltage signal acquisition circuit according to an embodiment of the present invention; Figure 8 A circuit diagram of a low voltage signal acquisition circuit according to an embodiment of the present invention; Fig. 9 A circuit diagram of a conversion chip according to an embodiment of the present invention; Fig.10 is a circuit diagram of a switching unit according to an embodiment of the present invention; Fig.11 A schematic diagram of a self-test step of a lightning suppressor tester according to an embodiment of the present invention; Fig.12 A schematic diagram of data processing steps of a lightning suppressor tester according to an embodiment of the present invention; Fig.13 A schematic diagram of a selection interface of a lightning suppressor tester according to an embodiment of the present invention; Fig.14 A schematic diagram of the front panel layout of a lightning suppressor tester according to an embodiment of the present invention; Fig.15 A schematic diagram of the rear panel layout of a lightning suppressor tester according to an embodiment of the present invention; Fig.16 The figure is a physical picture of a lightning suppressor tester according to an embodiment of the present invention. DETAILED DESCRIPTION

[0015] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0016] The present invention discloses a lightning suppressor tester, which is used to check the functions and performance-related parameters of lightning suppressors such as LD-01, LD-02, GLB-3, GLB-4, etc. equipped on various aircrafts, so as to meet the users' regular inspection and maintenance work. The lightning suppressor tester adopts a universal design concept, and adopts the modular design concept of "universal control mainboard plus special voltage module plus recovery sensor plus measurement and control embedded software", that is, sharing a universal control mainboard, by switching the corresponding voltage module and the corresponding measurement and control software interface, it can realize the inspection of the functions and performance-related parameters of lightning suppressors such as LD-01, LD-02, GLB-3, GLB-4, etc. equipped on various aircrafts. It is not a single-measurement lightning suppressor tester, but a universal lightning suppressor tester. Its structural schematic diagram is shown as follows. Figure 1 As shown, it specifically includes a power supply unit, a control unit, a signal acquisition unit, an output switching unit and a display unit. The power supply unit is respectively connected to the control unit, the signal acquisition unit and the output switching unit. The control unit is respectively connected to the display unit and the signal acquisition unit. The signal acquisition unit is connected to the output switching unit, and the output switching unit is connected to the device under test.

[0017] Exemplarily, the signal acquisition unit includes a high-voltage voltage signal acquisition circuit and a low-voltage current signal acquisition circuit, and the output ends of the high-voltage voltage signal acquisition circuit and the low-voltage current signal acquisition circuit are connected to a conversion module, and the conversion module is an AD7606 conversion chip. The low-voltage current signal acquisition circuit includes a sampling circuit, a TVS protection circuit, an operational amplifier circuit, and a voltage acquisition chip. The output end of the sampling circuit is connected to the input end of the operational amplifier circuit, and the input end of the operational amplifier circuit is also connected to the output end of the TVS protection circuit. The output end of the operational amplifier circuit is connected to the voltage acquisition chip; the operational amplifier circuit includes a first operational amplifier, the sampling circuit includes a sampling resistor, and the TVS protection circuit includes a first TVS tube and a second TVS tube. After the first TVS tube and the second TVS tube are connected in series, they are connected in parallel at both ends of the sampling resistor. After the sampling resistor is connected in series with the first resistor, it is connected to the positive input end of the first operational amplifier, and the negative input end of the first operational amplifier is connected to the output end; the circuit diagram of the low-voltage current signal acquisition circuit is as follows Figure 8 As shown, by selecting a 400Ω power sampling resistor to convert the 0mA~20mA DC current into a 0V to 8V DC voltage, the first operational amplifier is an OP07 amplifier, and after the operational amplifier follower, it is input to the AD7606 conversion chip. The AD7606 conversion chip circuit diagram is shown in Fig. 9 As shown in the figure, the input signal range of the AD7606 conversion chip is 0V~10V, with 16-bit high resolution, bipolar input, and synchronous ADC chip. The AD7606 conversion chip converts the voltage signal with current information into digital quantity and transmits it to the control unit for calculation and processing. The current acquisition accuracy can be better than ±1%. The function of the TVS tube in the current acquisition circuit is the same as that of the high-voltage voltage signal acquisition circuit, which prevents high voltage from impacting the subsequent circuit.

[0018] The high-voltage voltage signal acquisition circuit includes a voltage divider circuit, a TVS protection circuit, an operational amplifier circuit and a voltage acquisition chip. The output end of the voltage divider circuit is connected to the input end of the operational amplifier circuit, and the input end of the operational amplifier circuit is also connected to the output end of the TVS protection circuit. The output end of the operational amplifier circuit is connected to the voltage acquisition chip; the operational amplifier circuit includes a second operational amplifier, and the TVS protection circuit includes a second resistor, a third resistor, a third TVS tube and a fourth TVS tube. One end of the second resistor is connected to the positive input end of the second operational amplifier, and the common point thereof is also connected to the third resistor, the third TVS tube and the fourth TVS tube connected in series in sequence, and the negative input end of the second operational amplifier is connected to its output end. The circuit diagram of the high-voltage voltage signal acquisition circuit is shown in FIG. Figure 7As shown in the figure, the high voltage is reduced from 0V to 400V to 0V to 9.75V after being divided by the voltage divider circuit. The second operational amplifier is the OP07 amplifier. The OP07 operational amplifier circuit is followed and output to the AD7606 conversion chip. The input signal range of the AD7606 conversion chip is 0V to 10V, which is 16-bit high resolution, bipolar input, and synchronous ADC chip. The OP07 circuit operational amplifier is a non-rail-to-rail precision operational amplifier, powered by ±15V, and applicable to the input signal voltage range of 0V to 10V; the TVS tube uses the TVS6.8CA series with a breakdown voltage of 6.8V. After two TVS tubes are connected in series, the breakdown voltage is 13.6V. The protection circuit is suitable for lightning protection and surge absorption due to its fast response speed (PS level), large transient power, low clamping voltage, and precise voltage. When the sampling circuit is damaged or there is an impact voltage high voltage entering, the TVS tube will reduce the voltage to 13.6V to prevent damage to the subsequent circuit. The AD7606 conversion chip converts the voltage analog quantity into digital quantity and transmits it to the control unit for calculation and processing. The voltage signal acquisition accuracy can be better than ±1%.

[0019] For example, considering the use environment of the product, combined with the actual situation in the workplace, and based on the principle of convenient operation and use, the lightning suppressor tester can be powered by 220VAC±10%, 50Hz industrial frequency power supply or DC28V±10%, and the power cable length is greater than 10m. The power supply unit is powered by 220VAC±10% or 115V±5%, 400Hz, and the switching power supply RS-50-24 converts 220VAC±10% into DC24V to power other circuits. The rate is 50W; it adopts high-frequency switching, high reliability, small ripple, and meets the power supply requirements of each unit of the equipment. It has the following characteristics: 0.01% source effect, 0.02% load effect, stable power output; fast command processing time to improve throughput; it has constant voltage and constant current output function, series and parallel output function, remote compensation function, storage and call function, and voltage and current measurement function. It has an anti-current backflow function, which can prevent the backflow of battery motor load current; it also has overvoltage, overcurrent, short circuit and other protection functions. The actual picture of the switching power supply is as follows Figure 2 shown.

[0020] Exemplarily, the +5VDC and ±15VDC power supplies required by the lightning suppressor tester are converted by Goldensun's WRA or WRB series high-reliability DC-DC power supply modules. The output power of the power conversion module is 3W, with a self-recovering short-circuit protection function, an operating temperature range of -40° to +85°, and an ultra-small SIP package. When the ±15VDC power supply is output through the first DC-DC power supply module, the first DC-DC power supply module is a WRA2415S-3WR2 module. The second pin of the WRA2415S-3WR2 module is connected to a 27V power supply. The first pin of the WRA2415S-3WR2 module is grounded, the first pin and the second pin of the WRA2415S-3WR2 module are connected in parallel with the second capacitor C5 and the third capacitor C6 respectively, the sixth pin of the WRA2415S-3WR2 module is connected to the +15 power supply, the eighth pin of the WRA2415S-3WR2 module is connected to the -15 power supply, the seventh pin of the WRA2415S-3WR2 module is connected to the voltage reference point, the first capacitor C3 is connected in parallel between the seventh pin and the sixth pin of the WRA2415S-3WR2 module, and the fourth capacitor C7 is connected in parallel between the seventh pin and the eighth pin of the WRA2415S-3WR2 module. The power conversion schematic diagram is as follows Figure 3 shown.

[0021] When 5VDC power is output through the second DC-DC power module, the second DC-DC power module is a WRB2405S-3WR2 module, the first pin of the WRB2405S-3WR2 module is grounded, the second pin of the WRB2405S-3WR2 module is connected to a 27V power supply, the sixth capacitor C11 and the seventh capacitor C12 are respectively connected in parallel between the first pin and the second pin of the WRB2405S-3WR2 module, the sixth pin of the WRB2405S-3WR2 module is connected to a 5V power supply, the seventh pin of the WRB2405S-3WR2 module is connected to a voltage reference point, the eighth pin of the WRB2405S-3WR2 module is connected in series with the eighth capacitor C13 and then connected to the seventh pin, and the fifth capacitor C10 is connected in parallel between the sixth pin and the seventh pin of the WRB2405S-3WR2 module.

[0022] The 3.3VDC power supply is output through the AMS1117-3.3 voltage regulator chip; AMS1117-3.3 voltage regulator chip AMS1117 series is an 800mA current output step-down integrated voltage regulator circuit with functions such as current limiting and overheating cutoff, and the temperature range is -40°~+125°.

[0023] The high voltage source required for the lightning suppressor tester to output high voltage is selected from SRA's GRB series DCDC power module—GRB24300DG-15W, which outputs high voltage through a third DC-DC power module. The third DC-DC power module is a GRB24300DG-15W module. The output pin of the GRB24300DG-15W module is connected in series with a fourth resistor and then connected to the output voltage. The power supply unit also includes a fuse, which is respectively connected to the switching power supply and the third DC-DC power module. The circuit diagram of the high voltage power module is as follows: Figure 4 As shown. GRB24300DG-15W has an adjustable output high voltage range of 0V to 300V; the output voltage value is adjusted by the control port voltage, and the control port voltage range is: 0V to 5V; the output power is 15W; when the output voltage is 300V, the output current can reach 50mA; the operating temperature range is -40° to +85°.

[0024] Exemplarily, the control unit is composed of a 32-bit high-performance ARM Cortex-M3 processor series single-chip microcomputer STM32F103RCT6 and peripheral circuits. The main frequency of the single-chip microcomputer STM32F103RCT6 can reach 72MHz, it has good anti-interference performance, and has a wealth of communication interfaces. It is very suitable for use with digital-to-analog and analog-to-digital conversion chips to realize analog quantity acquisition and output; it is also suitable for display screen control, multi-channel relay control and ATE automatic testing, etc. Its multi-channel switch output IO port is used for switching of relays with a DC voltage output range of ≤400V; its SPI interface connects DA and AD chips, which are used for power module output high voltage control and voltage and current recovery, respectively. The equipment control adopts the solution of relays plus intelligent LCD display to realize interactive control of the equipment. The user only needs to click on the touch screen to complete the corresponding parameter measurement and calculation, and display the test results on the LCD screen. The indicator light interface is connected to the ARM working indicator light. The circuit diagram of the control unit is as follows Figure 5 shown.

[0025] For example, the lightning suppressor tester uses Jinpeng's OCM320480T350-3D intelligent LCD color screen, which switches various working states by touch, and uses Jinpeng's 3.5-inch wide temperature and high-resolution LCD display. It uses a 32-bit ARM processor + FPGA dual-core control architecture to develop a high-performance, low-power, easy-to-use 64K color display that can be directly connected to an MCU with a UART serial interface. The user only needs to send commands to the terminal through the serial port to complete the corresponding operation. The processor adopts a 32-bit ARM processor + FPGA dual-core control architecture, which has the function of strengthening graphics processing; it has a storage capacity of 1GBit Flash, which can store more than 100 16-bit true color pictures; it is equipped with a picture download link port, which is a full-speed USB with a download speed of 600KB / S, and a communication interface, which is 3.3VR, RS232 or TTL / COMS level; it has the following software functions: powerful IDE compilation and download environment, visual window, and beautiful interface; IDE integrates a large number of industrial control industry icons, buttons, 3D view light vector diagrams, which reduces the difficulty of art design; it supports the creation of multiple pages, and the software automatically generates the driver function of each page after compilation; it supports PC software and HMI synchronous display, and has online debugging and other functions; it indicates binary file burning, which makes mass production faster and safer, and the IDE will automatically generate the project binary file after the project is compiled. It has the following hardware features: 16-bit true color RGB display; supports the highest resolution of 320*480; built-in standard 8*12, 12*24, 16*32 ASIC fonts, 12*12, 16*16, 24*24 characters; supports cursor display, dot, circle, line, rectangle and other GUI graphics and GIF animation display; baud rate range 1200-115200bps; LCD screen performance indicators fully meet the design requirements. The LCD screen uses TTL level interface communication, connects the RXD pin of the OCM320480T700-2D LCD screen to the TXD pin of the microprocessor, and connects the TXD pin of the LCD screen to the RXD pin of the microprocessor, to achieve communication between the LCD screen and the microprocessor, and completes the operation control and display parameters and other functions. The schematic diagram is as follows Figure 6 shown.

[0026] Exemplarily, the output switching unit is also connected to a lightning suppressor characteristic voltage test circuit. During the lightning suppressor test process, it is necessary to simulate the condition of the lightning suppressor being struck by lightning, so a lightning suppressor characteristic voltage test circuit is designed. High voltage is applied to the lightning suppressor. The high voltage value should not be greater than the 1-second overvoltage value in the technical parameters of the lightning suppressor. The high voltage power-on time of the lightning suppressor should be less than 1s. The time is short and the voltage is high. The circuit uses a single-chip microcomputer to control the switching unit to complete the output high voltage on-off control, and the high voltage connection time is less than 100ms. The lightning suppressor characteristic voltage test circuit adopts ULN2803 chip, the first pin to the eighth pin of ULN2803 are connected to the input end, the ninth pin is grounded, the tenth pin is connected to 27VCC, and the eleventh pin to the eighteenth pin are connected to the output end; when performing the lightning suppressor characteristic voltage test, the voltage is first adjusted to a position about 50V higher than the specified characteristic voltage value, and then the CBB capacitor is charged for 1 second, and then the voltage on the capacitor is switched to the lightning suppressor by a relay, and the capacitor is discharged through the lightning suppressor; a 3.3µF / 400V CBB capacitor is selected to ensure that the discharge time is less than 1s, and the lightning strike process is simulated. The single-chip microcomputer controls the AD7606 conversion chip to sample the voltage and current at a sampling frequency of 500Hz at a rate of 200 points / S. After the sampling is completed, the sampling data is sent to the single-chip microcomputer for processing and analysis to determine the voltage corresponding to the 1mA current, thereby completing the characteristic value voltage test. The output switching unit uses Omron G5V-2 relay, which is a double-pole double-throw relay. The double contacts can reduce the contact resistance and improve reliability. The parameters of the G5V-2 relay are as follows: the contact resistance of its single contact is below 50mΩ; the action time is less than 7ms, and the reset time is less than 3ms; the withstand voltage of the same-pole contact is 750V; the mechanical life is greater than 15 million times, and the electrical life is greater than 100,000 times. The circuit diagram of the switching unit is as follows Fig.10 shown.

[0027] Exemplarily, the present invention uses STM32F103RCT6 as the hardware platform, Keil uVision5 as the programming and debugging platform, and uses C language for programming. The measurement and control software adopts a hierarchical and modular design concept in structure, which improves the reusability of the software; in terms of process, it adopts multi-level encapsulation technology for interface design, hides the complex implementation process inside the entity, and provides a simple and reliable access control interface to the outside, which improves the maintainability and scalability of the system. The test of each part is completed through the above operations. Check the working conditions of the power supply unit, signal acquisition unit and control unit of the test equipment itself. When the equipment works normally, select the self-test program and enter the self-test mode. First, complete the self-test of the equipment, then the current acquisition channel, the voltage acquisition channel, and finally complete the display communication and output voltage control self-test. The self-test time is designed to be ≯1min. The schematic diagram of the self-test steps of the present invention is as follows Fig.11The data processing mainly completes the detection of analog signals, and realizes the switching of specific system equipment by calling various functional submodules, completes the function and performance detection of multiple products, and the test time of a single product is ≯2min. The data processing step diagram of the present invention is shown in Fig.12 As shown, the selection interface schematic diagram of the present invention is as follows Fig.13 shown.

[0028] For example, the chassis of the present invention adopts Haiyan Jingye's luxury 2U aluminum chassis, with a size of 230mm×90mm×220mm and a silver-gray shell color. The panel material of the present invention adopts LY12, and the panel surface is screen-printed after spraying to avoid the problem of handwriting falling off and blurring after long-term use. It is laid out according to function for easy use. The front panel is mainly composed of a power switch, a touch screen test hole, etc. The front panel layout diagram of the present invention is shown in FIG. Fig.14 The rear panel is mainly composed of test holes, fuses, aviation plug interfaces, etc. The rear panel layout diagram of the present invention is shown in FIG. Fig.15 shown.

[0029] For example, the physical diagram of the present invention is as follows Fig.16 As shown, it has the following characteristics: based on embedded technology design, automatic detection, convenient and fast; good versatility, can realize the detection of multiple types of lightning suppressors; touch screen design, friendly human-machine interface, easy to operate, intuitive display; the equipment has a self-test function, can self-test each module in the machine to ensure its own integrity; modular design, easy to disassemble and assemble, easy to debug, maintain and upgrade; can be powered by DC 27VDC or AC 220VAC / 50Hz.

[0030] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A lightning suppressor tester, characterized in that: It includes a power supply unit, a control unit, a signal acquisition unit, an output switching unit and a display unit, wherein the power supply unit is respectively connected to the control unit, the signal acquisition unit and the output switching unit, the control unit is respectively connected to the display unit and the signal acquisition unit, the signal acquisition unit is connected to the output switching unit, and the output switching unit is connected to the device under test; The signal acquisition unit includes a high-voltage voltage signal acquisition circuit and a low-voltage current signal acquisition circuit. The low-voltage current signal acquisition circuit includes a sampling circuit, a TVS protection circuit, an operational amplifier circuit and a voltage acquisition chip. The output end of the sampling circuit is connected to the input end of the operational amplifier circuit. The input end of the operational amplifier circuit is also connected to the output end of the TVS protection circuit. The output end of the operational amplifier circuit is connected to the voltage acquisition chip. The operational amplifier circuit includes a first operational amplifier. The sampling circuit includes a sampling resistor. The TVS protection circuit includes a first TVS tube and a second TVS tube. The first TVS tube and the second TVS tube are connected in series and then connected in parallel at both ends of the sampling resistor. The sampling resistor is connected in series with the first resistor and then connected to the positive input end of the first operational amplifier. The negative input end of the first operational amplifier is connected to the output end. The high-voltage voltage signal acquisition circuit includes a voltage divider circuit, a TVS protection circuit, an operational amplifier circuit and a voltage acquisition chip. The output end of the voltage divider circuit is connected to the input end of the operational amplifier circuit, the input end of the operational amplifier circuit is also connected to the output end of the TVS protection circuit, and the output end of the operational amplifier circuit is connected to the voltage acquisition chip; the operational amplifier circuit includes a second operational amplifier, and the TVS protection circuit includes a second resistor, a third resistor, a third TVS tube and a fourth TVS tube. One end of the second resistor is connected to the positive input end of the second operational amplifier, and the third resistor, the third TVS tube and the fourth TVS tube connected in series in sequence are also connected to the common point thereof. The negative input end of the second operational amplifier is connected to its output end.

2. A lightning suppressor tester according to claim 1, characterized in that: The output ends of the high voltage signal acquisition circuit and the low voltage current signal acquisition circuit are connected to the conversion module.

3. A lightning suppressor tester according to claim 1, characterized in that: ±15VDC power is output through the first DC-DC power module, the second pin of the first DC-DC power module is connected to the input power supply, the first pin of the first DC-DC power module is grounded, the first pin and the second pin of the first DC-DC power module are respectively connected in parallel with the second capacitor C5 and the third capacitor C6, the sixth pin of the first DC-DC power module is connected to the +15V power output, the eighth pin of the first DC-DC power module is connected to the -15V power output, the seventh pin of the first DC-DC power module is connected to the voltage reference point, the first capacitor C3 is connected in parallel between the seventh pin and the sixth pin of the first DC-DC power module, and the fourth capacitor C7 is connected in parallel between the seventh pin and the eighth pin of the first DC-DC power module; A 5VDC power supply is output through a second DC-DC power supply module, a first pin of the second DC-DC power supply module is grounded, a second pin of the second DC-DC power supply module is connected to a power input, a sixth capacitor C11 and a seventh capacitor C12 are connected in parallel between the first pin and the second pin of the second DC-DC power supply module, a sixth pin of the second DC-DC power supply module is connected to a 5V power output, a seventh pin of the second DC-DC power supply module is connected to a voltage reference point, an eighth pin of the second DC-DC power supply module is connected in series with an eighth capacitor C13 and then connected to the seventh pin, and a fifth capacitor C10 is connected in parallel between the sixth pin and the seventh pin of the second DC-DC power supply module; Output 3.3VDC power through the voltage regulator module; The high voltage power is outputted through the third DC-DC power module, and the output pin of the third DC-DC power module is connected to the output voltage after being connected in series with a fourth resistor.

4. A lightning suppressor tester according to claim 3, characterized in that: The power supply unit also includes a fuse and a switching power supply, and the fuse is connected to the switching power supply and the third DC-DC power supply module respectively.

5. The lightning suppressor tester according to claim 1, characterized in that: The control unit includes a controller module, which is provided with an output interface, a serial port and an indicator light interface. The output interface is connected to a relay for switching when the DC voltage output range is less than or equal to 400V. The serial port is connected to a signal conversion module for high-voltage control of the power module output and voltage and current recovery. The indicator light interface is connected to a working indicator light.

6. A lightning suppressor tester according to claim 1, characterized in that: The display unit is an intelligent liquid crystal color screen, and the working state is switched by touching.

7. The lightning suppressor tester according to claim 1, characterized in that: The output switching unit is also connected to a lightning suppressor characteristic voltage test circuit, which includes a transistor array module, wherein the first to eighth pins of the transistor array module are connected to the input end, the ninth pin is grounded, the tenth pin is connected to the power supply, and the eleventh to eighteenth pins are connected to the output end. The switching unit is a double-pole double-throw relay, and the double contacts reduce contact resistance and improve reliability.

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