Lightning protection element tester calibration device

Abstract

The utility model relates to a calibration device for a lightning protection element tester. The calibration device comprises a piezoresistor, a switch, a first variable resistor assembly, a second variable resistor assembly, an operational amplifier, an acquisition control unit, an HV + terminal and an HV-terminal. The lightning protection element tester calibration device simplifies the whole circuit, solves the problem that the traditional lightning protection element tester is complex and time-consuming in calibration, and saves the equipment cost.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring instrument calibration, in particular to a lightning protection component tester calibration device. Background Art

[0002] Lightning protection components are indispensable electronic raw materials in lightning protection projects, and the quality of lightning protection components directly affects the lightning protection performance. The installation of inferior lightning protection components cannot effectively prevent the occurrence of lightning damage, and there is a hidden danger of causing equipment property losses and personal injury. In the production and installation process of lightning protection components, lightning protection component testers are usually used to measure lightning protection components to ensure that their performance meets the requirements. It can be seen that the effectiveness of the quality inspection results of lightning protection components is closely related to the measurement accuracy of the lightning protection component tester. Therefore, the calibration of the lightning protection component tester is crucial.

[0003] The calibration indicators of lightning protection component testers include: starting action voltage, constant current, DC leakage current, and DC breakdown voltage. The current calibration method of lightning protection component testers requires multiple devices to cooperate with each other, and the wiring is complicated. The calibration point setting requires complex and large amounts of manual calculations, which makes the calibration work time-consuming and labor-intensive, and cannot be carried out efficiently. Utility Model Content

[0004] The utility model aims at the technical problems existing in the prior art and provides a lightning protection component tester calibration device, which simplifies the overall circuit, solves the problem that the calibration of the traditional lightning protection component tester is complicated and time-consuming, and saves equipment costs.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] A lightning protection component tester calibration device, comprising a varistor 1, a switch 2, a first variable resistor component 3, a second variable resistor component 4, an operational amplifier 5, an acquisition control unit 6, an HV+ terminal and an HV- terminal, wherein the HV+ terminal is respectively connected to one end of the varistor 1 and one end of the first variable resistor component 3, the other end of the varistor 1 is connected to one end of the switch 2, the other end of the first variable resistor component 3, one end of the second variable resistor component 4 and the other end of the switch 2 are commonly connected to the reverse input end of the operational amplifier 5, the output end of the operational amplifier 5 and the other end of the second variable resistor component 4 are connected to the input end of the acquisition control unit 6, the positive input end of the operational amplifier 5 and the HV- terminal are commonly grounded, and the output end of the acquisition control unit 6 is respectively connected to the first variable resistor component 3 and the second variable resistor component 4;

[0007] When the switch 2 is disconnected, the acquisition control unit 6 sequentially performs a starting action voltage calibration and a constant current calibration on the lightning protection component tester through the HV+ terminal and the HV- terminal;

[0008] When the switch 2 is closed, the acquisition control unit 6 performs leakage current calibration on the lightning protection component tester through the HV+ terminal and the HV- terminal.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Preferably, the lightning protection component tester calibration device further includes a simulated ignition device 7, the varistor 1 and the first variable resistance component 3 are connected to the positive input end of the operational amplifier 5 through the simulated ignition device 7, and the control signal input end of the simulated ignition device 7 is connected to the acquisition control unit 6;

[0011] The acquisition control unit 6 controls the action voltage of the simulated ignition device 7 so that the output voltage of the lightning protection component tester rises to the calibration point, triggering the simulated ignition device 7 to break down, and performing DC breakdown voltage calibration on the lightning protection component tester.

[0012] Preferably, the first variable resistor component 3 includes multiple groups of parallel circuits and a first resistor, and the multiple groups of parallel circuits and the first resistor are connected in series to form a series circuit; the parallel circuit includes at least one second resistor and at least one first switch, and the second resistor and the first switch are connected in parallel to form the parallel circuit.

[0013] Preferably, the first variable resistor component 3 includes a resistor R11, a resistor R12, a resistor R13, a resistor R14, a switch S1, a switch S2 and a switch S3, one end of the resistor R11 is connected to one end of the switch S1, one end of the switch S2 and one end of the switch S3, the other end of the resistor R11 and the other end of the switch S1 are connected to one end of the resistor R12, the other end of the resistor R12 and the other end of the switch S2 are connected to one end of the resistor R13, and the other end of the resistor R13 and the other end of the switch S3 are connected to one end of the resistor R14.

[0014] Preferably, the second variable resistor component 4 includes multiple groups of series circuits, which are connected in parallel to form a parallel circuit; the series circuit includes at least one third resistor and at least one second switch, and the third resistor and the second switch are connected in series to form the series circuit.

[0015] Preferably, the second variable resistor component 4 includes a resistor R21, a resistor R22, a resistor R23, a switch S4, a switch S5 and a switch S6, one end of the resistor R21 is connected to one end of the resistor R22 and one end of the resistor R23, the other end of the resistor R21 is connected to one end of the switch S4, the other end of the resistor R22 is connected to one end of the switch S5, the other end of the resistor R23 is connected to one end of the switch S6, and the other end of the switch S4 is connected to the other end of the switch S5 and the other end of the switch S6.

[0016] The beneficial effects of the utility model are as follows: the lightning protection component tester calibration device of the utility model adjusts the total resistance of the first variable resistor component R1 and the total resistance of the second variable resistor component R2 through the acquisition control unit, thereby realizing the starting action voltage calibration, constant current calibration and DC leakage current calibration of the connected lightning protection component tester, and controlling the action voltage of the simulated ignition device through the acquisition control unit to realize the DC breakdown voltage calibration of the lightning protection component tester, integrating multiple calibration items of the lightning protection component tester, reducing complex wiring and calibration point setting, solving the problem of complex and time-consuming calibration of traditional lightning protection component testers, simplifying the overall circuit, and saving equipment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the overall principle block diagram of the utility model;

[0018] Figure 2 This is a diagram of the use state of the utility model;

[0019] Figure 3 The circuit structure principle diagram of the first variable resistor component of the present invention;

[0020] Figure 4 This is a circuit structure schematic diagram of the second variable resistor component of this utility model. DETAILED DESCRIPTION

[0021] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0022] This embodiment provides a lightning protection component tester calibration device, such as Figure 1 and Figure 2As shown, the lightning protection component tester calibration device includes a varistor 1, a switch 2, a first variable resistor component 3, a second variable resistor component 4, an operational amplifier 5, an acquisition control unit 6, an HV+ terminal and an HV- terminal, the HV+ terminal is respectively connected to one end of the varistor 1 and one end of the first variable resistor component 3, the other end of the varistor 1 is connected to one end of the switch 2, the other end of the first variable resistor component 3, one end of the second variable resistor component 4 and the other end of the switch 2 are commonly connected to the reverse input end of the operational amplifier 5, the output end of the operational amplifier 5 and the other end of the second variable resistor component 4 are connected to the input end of the acquisition control unit 6, the positive input end of the operational amplifier 5 and the HV- terminal are commonly grounded, and the output end of the acquisition control unit 6 is respectively connected to the first variable resistor component 3 and the second variable resistor component 4.

[0023] Among them, when the switch 2 is disconnected, the acquisition control unit 6 performs the starting action voltage calibration and the constant current calibration on the lightning protection component tester in sequence through the HV+ terminal and the HV- terminal; when the switch 2 is closed, the acquisition control unit 6 performs the leakage current calibration on the lightning protection component tester through the HV+ terminal and the HV- terminal.

[0024] Furthermore, the lightning protection component tester calibration device also includes a simulated ignition device 7, the varistor 1 and the first variable resistance component 3 are connected to the positive input end of the operational amplifier 5 through the simulated ignition device 7, and the control signal input end of the simulated ignition device 7 is connected to the acquisition control unit 6;

[0025] The acquisition control unit 6 controls the action voltage of the simulated ignition device 7 so that the output voltage of the lightning protection component tester rises to the calibration point, triggering the simulated ignition device 7 to break down, and performing DC breakdown voltage calibration on the lightning protection component tester.

[0026] During actual use, the positive pole of the lightning protection component tester is connected to the above-mentioned HV+ terminal, and the negative pole of the lightning protection component tester is connected to the above-mentioned HV- terminal. The switch S of the lightning protection component tester calibration device in this embodiment is in the disconnected state, and the calibration device performs starting action voltage calibration and constant current calibration on the lightning protection component tester in turn.

[0027] Among them, when calibrating the starting action voltage, according to Ohm's law, the calibration point U of the starting action voltage is 1mA The calculation formula is as follows:

[0028] U 1mA =I0R1; (1)

[0029] Where, I0=1mA, based on the calibration point, the resistance value of the first variable resistor component R1 is controlled by the acquisition control unit, and the resistance value of the second variable resistor component R2 is controlled by the acquisition control unit according to the output voltage of the ADC of the acquisition control unit, and the acquisition control unit is used to collect the voltage U0, the actual value of the starting action voltage U HV The calculation formula is as follows:

[0030]

[0031] When calibrating the constant current, the resistance value of the second variable resistor component R2 is controlled by the acquisition control unit, the varistor voltage function of the lightning protection component tester is turned on, and the voltage U0 is collected by the acquisition control unit. The actual value of the constant current is calculated as follows:

[0032]

[0033] Furthermore, in this embodiment, the switch S of the calibration device of the lightning protection component tester is closed, and the calibration device performs leakage current calibration on the lightning protection component tester. The calculation formula of the calibration point of the leakage current is as follows:

[0034]

[0035] Among them, U N is the varistor voltage value of the varistor U. Based on formula (4), by changing the resistance value of the first variable resistor component R1, the leakage current I is adjusted to the calibration point. The voltage U0 is collected by the collection control unit. The actual value of the leakage current is calculated as follows:

[0036]

[0037] Further, see Figure 2 When the lightning protection component tester performs DC breakdown voltage calibration, a simulated ignition device is also required. The acquisition control unit is connected to the simulated ignition device. One end of the varistor U, one end of the first variable resistance component R1 and the positive input end of the operational amplifier A are all connected to the simulated ignition device. The DC breakdown voltage calibration of the lightning protection component tester is realized by controlling the simulated ignition device with the aid of the acquisition control unit. The specific steps are as follows:

[0038] The acquisition control unit controls the action voltage of the simulated ignition device so that the output voltage of the lightning protection component tester rises to the calibration point, triggering the simulated ignition device to break down. The acquisition control unit acquires the voltage U0. At this time, the actual value of the DC breakdown voltage U bn The calculation formula is as follows:

[0039]

[0040] The lightning protection component tester calibration device in this embodiment adjusts the total resistance of the first variable resistor component R1 and the total resistance of the second variable resistor component R2 through the acquisition control unit, thereby realizing the starting action voltage calibration, constant current calibration and DC leakage current calibration of the connected lightning protection component tester, and controlling the action voltage of the simulated ignition device through the acquisition control unit to realize the DC breakdown voltage calibration of the lightning protection component tester, and integrates multiple calibration items of the lightning protection component tester. The entire calibration process does not require complicated calculations and parameter adjustments, reduces complicated wiring and calibration point settings, solves the problem of complex and time-consuming calibration of traditional lightning protection component testers, simplifies the overall circuit, saves equipment costs, and improves work efficiency.

[0041] On the basis of the above technical solution, the present invention can also be improved as follows.

[0042] In a possible embodiment, the first variable resistor component 3 includes multiple groups of parallel circuits and a first resistor, and the multiple groups of parallel circuits and the first resistor are connected in series to form a series circuit; the parallel circuit includes at least one second resistor and at least one first switch, and the second resistor and the first switch are connected in parallel to form the parallel circuit.

[0043] For details, see Figure 3 ,exist Figure 3 The first variable resistor component R1 can be composed of multiple resistors and multiple switches, wherein the multiple resistors are connected in series, and the multiple switches are connected to the acquisition control unit. The acquisition control unit controls the on and off of each branch where each resistor is located by means of the multiple switches, thereby realizing the resistance control of the first variable resistor component R1.

[0044] Exemplarily, the first variable resistance component R1 includes 4 resistors and 3 switches, specifically including resistor R11, resistor R12, resistor R13, resistor R14, switch S1, switch S2 and switch S3, one end of the resistor R11 is connected to one end of the switch S1, one end of the switch S2 and one end of the switch S3, the other end of the resistor R11 and the other end of the switch S1 are connected to one end of the resistor R12, the other end of the resistor R12 and the other end of the switch S2 are connected to one end of the resistor R13, and the other end of the resistor R13 and the other end of the switch S3 are connected to one end of the resistor R14.

[0045] Furthermore, the connection point between the resistor R11 and the switch S1 is used to be connected to the HV+ terminal together with the varistor U, and the other end of the resistor R14 is used to be connected to the reverse input terminal of the operational amplifier A together with one end of the second variable resistor component R2.

[0046] The acquisition control unit can be electromagnetically connected to the switch S1, the switch S2 and the switch S3 respectively, so as to realize the opening / closing control of the switch S1, the switch S2 and the switch S3.

[0047] It can be understood that when the acquisition control unit controls the three switches in this embodiment to be disconnected, the total resistance of the first variable resistor component R1 is the sum of the resistances of the resistors R11, R12, R13 and R14; when the acquisition control unit controls the switch S1 to be closed, and the switches S2 and S3 to be disconnected, the total resistance of the first variable resistor component R1 is the sum of the resistances of the resistors R12, R13 and R14; when the acquisition control unit controls the switch S2 to be closed, and the switches S1 and S3 to be disconnected, the total resistance of the first variable resistor component R1 is the sum of the resistances of the resistors R13 and R14; when the acquisition control unit controls the switch S3 to be closed, and the switches S1 and S2 to be disconnected, the total resistance of the first variable resistor component R1 is the resistance of the resistor R14. In this way, the acquisition control unit can change the total resistance of the first variable resistor component R1 by controlling the on and off of the switches S1, S2 and S3 respectively.

[0048] In a possible embodiment, the second variable resistance component 4 includes multiple groups of series circuits, which are connected in parallel to form a parallel circuit; the series circuit includes at least one third resistor and at least one second switch, and the third resistor and the second switch are connected in series to form the series circuit.

[0049] For details, see Figure 4 ,exist Figure 4 The second variable resistor component R2 can be composed of multiple resistors and multiple switches, the resistance value of each resistor is different, each resistor and its corresponding switch are connected in series to form a branch, and multiple branches are connected in parallel. Multiple switches are electromagnetically connected to the acquisition control unit, and the acquisition control unit controls the on and off of each branch where each resistor is located by means of multiple switches.

[0050] Exemplarily, the second variable resistor component includes a resistor R21, a resistor R22, a resistor R23, a switch S4, a switch S5 and a switch S6, one end of the resistor R21 is connected to one end of the resistor R22 and one end of the resistor R23, the other end of the resistor R21 is connected to one end of the switch S4, the other end of the resistor R22 is connected to one end of the switch S5, the other end of the resistor R23 is connected to one end of the switch S6, and the other end of the switch S4 is connected to the other end of the switch S5 and the other end of the switch S6.

[0051] In this embodiment, the acquisition control unit controls the on-off of the switch S4, the switch S5 and the switch S6 respectively, thereby controlling the on-off of the branch where each switch is located, thereby changing the total resistance value of the second variable resistance component R2.

[0052] Working principle:

[0053] The lightning protection component tester calibration device provided in this embodiment is connected to the first variable resistor component R1 and the second variable resistor component R2 respectively through the acquisition control unit to control the total resistance of the first variable resistor component R1 and the total resistance of the second variable resistor component R2 respectively, thereby realizing the calibration of the metrological verification index of the lightning protection component tester. The entire calibration process only needs to control the total resistance of the first variable resistor component R1 and the total resistance of the second variable resistor component R2 through the acquisition control unit according to the calibration points of each verification index, without complex calculations and parameter adjustments, easy to operate, high efficiency, and solves the current lightning protection component tester calibration method that requires multiple devices to cooperate with each other, complex wiring, and calibration point setting requires complex and a large amount of manual calculations, resulting in time-consuming and labor-intensive calibration work, and the problem that it cannot be carried out efficiently. The circuit structure of the lightning protection component tester calibration device of the utility model is simple, and a simple circuit is used to realize the calibration of the lightning protection component tester, saving equipment costs and equipment assembly costs, and is worthy of promotion.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lightning protection component tester calibration device, characterized in that: include: A varistor (1), a switch (2), a first variable resistor component (3), a second variable resistor component (4), an operational amplifier (5), a collection control unit (6), an HV+ terminal and an HV- terminal, wherein the HV+ terminal is respectively connected to one end of the varistor (1) and one end of the first variable resistor component (3), the other end of the varistor (1) is connected to one end of the switch (2), the other end of the first variable resistor component (3), one end of the second variable resistor component (4) and the other end of the switch (2) are commonly connected to the reverse input end of the operational amplifier (5), the output end of the operational amplifier (5) and the other end of the second variable resistor component (4) are connected to the input end of the collection control unit (6), the positive input end of the operational amplifier (5) and the HV- terminal are commonly grounded, and the output end of the collection control unit (6) is respectively connected to the first variable resistor component (3) and the second variable resistor component (4); When the switch (2) is disconnected, the acquisition control unit (6) sequentially performs a starting action voltage calibration and a constant current calibration on the lightning protection component tester through the HV+ terminal and the HV- terminal; When the switch (2) is closed, the acquisition control unit (6) performs leakage current calibration on the lightning protection component tester through the HV+ terminal and the HV- terminal.

2. The lightning protection component tester calibration device according to claim 1, characterized in that: The lightning protection component tester calibration device further comprises a simulated ignition device (7), the varistor (1) and the first variable resistance component (3) are connected to the positive input end of the operational amplifier (5) via the simulated ignition device (7), and the control signal input end of the simulated ignition device (7) is connected to the acquisition control unit (6); The acquisition control unit (6) controls the action voltage of the simulated ignition device (7) so that the output voltage of the lightning protection component tester rises to a calibration point, triggering the simulated ignition device (7) to break down, and performing a DC breakdown voltage calibration on the lightning protection component tester.

3. The lightning protection component tester calibration device according to claim 1, characterized in that: The first variable resistor component (3) comprises a plurality of parallel circuits and a first resistor, wherein the plurality of parallel circuits and the first resistor are connected in series to form a series circuit; the parallel circuit comprises at least one second resistor and at least one first switch, wherein the second resistor and the first switch are connected in parallel to form the parallel circuit.

4. The lightning protection component tester calibration device according to claim 3, characterized in that: The first variable resistor component (3) comprises a resistor R11, a resistor R12, a resistor R13, a resistor R14, a switch S1, a switch S2 and a switch S3, one end of the resistor R11 is connected to one end of the switch S1, one end of the switch S2 and one end of the switch S3, the other end of the resistor R11 and the other end of the switch S1 are connected to one end of the resistor R12, the other end of the resistor R12 and the other end of the switch S2 are connected to one end of the resistor R13, and the other end of the resistor R13 and the other end of the switch S3 are connected to one end of the resistor R14.

5. The lightning protection component tester calibration device according to claim 1, characterized in that: The second variable resistance component (4) comprises a plurality of series circuits, which are connected in parallel to form a parallel circuit; the series circuit comprises at least one third resistor and at least one second switch, and the third resistor and the second switch are connected in series to form the series circuit.

6. The lightning protection component tester calibration device according to claim 5, characterized in that: The second variable resistor component (4) comprises a resistor R21, a resistor R22, a resistor R23, a switch S4, a switch S5 and a switch S6, one end of the resistor R21 is connected to one end of the resistor R22 and one end of the resistor R23, the other end of the resistor R21 is connected to one end of the switch S4, the other end of the resistor R22 is connected to one end of the switch S5, the other end of the resistor R23 is connected to one end of the switch S6, and the other end of the switch S4 is connected to the other end of the switch S5 and the other end of the switch S6.

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