Time traceability calibration device and high-voltage switch tester calibration equipment

Abstract

The present invention relates to the field of high-voltage switch technology, specifically providing a time traceability calibration device and high-voltage switch tester calibration equipment. The time traceability calibration includes: a controller, a first pin of the controller electrically connected to a trigger circuit; the trigger circuit electrically connected to a target device, the trigger circuit sending a trigger signal to the target device based on a first control signal from the controller, the trigger signal used to trigger the target device to generate a pulse signal; a detection circuit used to detect the pulse signal generated by the target device, and a signal processing component used to detect the time information of the pulse signal. The present invention provides a time traceability calibration device to perform time traceability-level calibration on the signal generator of the high-voltage switch tester calibration equipment, thereby avoiding high-voltage switch tester calibration failures caused by inaccurate standard signals generated by the signal generator.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-voltage switches, and in particular relates to a time traceability calibration device and a high-voltage switch tester calibration device. Background Art

[0002] A high-voltage switch tester, also known as a high-voltage switch mechanical characteristic tester or circuit breaker dynamic characteristic tester, is a precision test device designed specifically for high-voltage circuit breakers. It accurately measures and records the mechanical and dynamic characteristic parameters of various high-voltage circuit breakers. These parameters include, but are not limited to, opening and closing time, synchronicity, opening and closing speed, number and duration of bounces, travel, opening distance, and overtravel, and are key indicators for evaluating circuit breaker performance.

[0003] The high-voltage switch tester calibration device is a special device used to calibrate the high-voltage switch tester. According to its working principle, the high-voltage switch tester calibration device is a time parameter measurement device that provides a set time for on and off.

[0004] During the calibration process of a high-voltage switch tester, the control and data processing module first sets the parameters of the signal generation module to generate a standard signal that meets the calibration requirements. For example, to calibrate the opening and closing time measurement function of a high-voltage switch tester, the signal generation module generates a pulse signal with a precise opening and closing time interval according to the settings. The time parameters of this signal are known and accurate, and it is sent as a standard signal to the high-voltage switch tester being calibrated. After receiving the standard signal, the high-voltage switch tester being calibrated will perform measurements according to its own measurement function and obtain the corresponding measurement results. Simultaneously, the measurement module of the calibration device will also synchronously measure the emitted standard signal to obtain accurate standard data. Calibration is achieved by comparing the high-voltage switch tester's measurement results with the standard data for consistency.

[0005] Therefore, the calibration device for high-voltage switch testers must be able to generate accurate standard pulse signals. Otherwise, the calibration of the high-voltage switch tester will fail. For example, if the actual generated standard pulse signal does not match the expected signal, the measurement results of the high-voltage switch tester will be misjudged as inaccurate. Summary of the Invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention provides a time traceability calibration device and a high-voltage switch tester calibration device to solve the above-mentioned technical problems.

[0007] In a first aspect, the present invention provides a time traceability calibration device, comprising:

[0008] a signal processing component, the signal processing component including a controller and a time measurement module, the controller being electrically connected to the time measurement module;

[0009] a trigger circuit, the trigger circuit being electrically connected to the controller; the trigger circuit being electrically connected to the target device, the trigger circuit sending a trigger signal to the target device based on a first control signal from the controller, the trigger signal being used to trigger the target device to generate a pulse signal;

[0010] A detection circuit, wherein the detection circuit includes multiple detection branches, the input ends of the multiple detection branches are respectively electrically connected to the multiple pulse signal output ends of the target device, the multiple detection branches are respectively electrically connected to the multiple power output ends, the multiple power output ends are electrically connected to a controller, and the multiple power output ends output voltages of corresponding magnitudes based on the power control signal of the controller; the detection branch generates a detection signal based on the pulse signal of the pulse signal output end and the voltage of the power output end; the output end of the detection circuit is electrically connected to the sampling port of the signal processing component;

[0011] The controller obtains time data from the time measurement module and generates waveform data of high and low level signals changing with time based on the detection signal, and the waveform data is used to calibrate the pulse signal.

[0012] In an optional embodiment, the controller is electrically connected to a host computer via a high-speed serial bus.

[0013] In an optional embodiment, the host computer includes an input component and a display component, the input component is used to set the trigger voltage of the trigger circuit, and the display component is used to display the waveform data; the host computer also includes an analysis module, which is used to compare the consistency of the pre-stored standard pulse signal with the time period of the waveform data.

[0014] In an optional embodiment, the trigger circuit is electrically connected to a switch component of the target device via an output terminal, and the output terminal of the trigger circuit is also electrically connected to a detection terminal of the detection circuit;

[0015] The detection end includes a first voltage-dividing resistor and a second voltage-dividing resistor connected in series, one end of the first voltage-dividing resistor that is not electrically connected to the second voltage-dividing resistor is electrically connected to a first electrode of an output end of a trigger circuit; a node between the first voltage-dividing resistor and the second voltage-dividing resistor is electrically connected to a first input end of a first photoelectric coupler; a second electrode of the output end of the trigger circuit is electrically connected to one end of a reference circuit via the first resistor, and the other end of the reference circuit is electrically connected to a second input end of the first photoelectric coupler;

[0016] The two ends of the reference circuit are electrically connected to the two poles of the filter capacitor respectively; the reference circuit includes a second resistor, one end of the second resistor is electrically connected to one end of the reference circuit, the other end of the second resistor is electrically connected to one end of the adjustable resistor, the other end of the adjustable resistor is electrically connected to the A end of the three-terminal adjustable shunt reference source, and the node between the adjustable resistor and the three-terminal adjustable shunt reference source is grounded; the R end of the three-terminal adjustable shunt reference source is electrically connected to one end of the second resistor; the K end of the three-terminal adjustable shunt reference source is the other end of the reference circuit;

[0017] The first output end of the first photoelectric coupler is electrically connected to the pull-up resistor. The first output end of the first photoelectric coupler is also connected to the controller. The ground output end of the first photoelectric coupler is grounded through the ground resistor. The ground resistor is connected in parallel with the protection capacitor.

[0018] In an optional embodiment, the trigger circuit includes:

[0019] a second photoelectric coupler, wherein a first input terminal of the second photoelectric coupler is electrically connected to the first pin, a line node between the first input terminal of the second photoelectric coupler and the first pin is connected to a pull-up resistor; and a second input terminal of the second photoelectric coupler is grounded;

[0020] The first output terminal of the second photoelectric coupler is grounded, the second output terminal of the second photoelectric coupler is electrically connected to the gate of the field effect tube via a voltage divider resistor, and the node between the second output terminal of the second photoelectric coupler and the voltage divider resistor is also connected to the power bus via a protection resistor; the source of the field effect tube is grounded, the drain of the field effect tube is connected to the first electrode of the output terminal, and the first electrode of the output terminal is also connected to the power bus via an inductor; the second electrode of the output terminal is grounded via a parallel resistor and a capacitor.

[0021] In an optional embodiment, the detection branch includes:

[0022] a third photoelectric coupler, wherein a first input terminal of the third photoelectric coupler is electrically connected to a power supply output terminal, the power supply output terminal including a protective resistor connected in series; the first input terminal of the third photoelectric coupler also serves as an input terminal of a detection branch and is electrically connected to a pulse signal output terminal of a target device, the power supply output terminal and the pulse signal output terminal of the target device are connected in parallel; and a second input terminal of the third photoelectric coupler is grounded;

[0023] The first output end of the third photoelectric coupler is grounded, and the second output end of the third photoelectric coupler is electrically connected to the sampling port of the signal processing component via a voltage divider resistor; the line node between the second output end of the third photoelectric coupler and the voltage divider resistor is connected to a 3.3V pull-up power supply.

[0024] In an optional embodiment, the signal processing component includes:

[0025] An RF coaxial connector, wherein the outer port of the RF coaxial connector is electrically connected to the sampling port of the detection circuit; the inner port of the RF coaxial connector is electrically connected to the input end of the front-end signal conditioning circuit, and the front-end signal conditioning circuit is used to attenuate and gain adjust, filter and impedance match the sampling signal; the output end of the front-end signal conditioning circuit is electrically connected to the input end of the analog-to-digital converter, and the analog-to-digital converter includes a cache medium, and the cache medium is used to store digital signals; the output end of the analog-to-digital converter communicates with the controller; the controller communicates with the onboard clock; and the controller communicates with the memory.

[0026] In a second aspect, the present invention provides a high-voltage switch tester calibration device, comprising:

[0027] A signal generator module, configured to generate a calibration signal, wherein the calibration signal includes a pulse signal, a voltage signal, and a current signal;

[0028] An interface module is used to establish a communication channel with the high-voltage switch tester under test;

[0029] Sending a calibration signal to the high-voltage switch tester under test based on the communication channel, and collecting measurement data of the calibration signal by the high-voltage switch tester under test;

[0030] A time traceability calibration device is used to calibrate the signal generator module.

[0031] In an optional embodiment, the time traceability calibration device is the time traceability calibration device provided in the first aspect.

[0032] The beneficial effect of the present invention is that the time traceability calibration device and high-voltage switch tester calibration equipment provided by the present invention provide a time traceability calibration device to perform time traceability level calibration on the signal generator of the high-voltage switch tester calibration equipment, thereby avoiding the failure of the high-voltage switch tester calibration due to inaccurate standard signals generated by the signal generator.

[0033] In addition, the present invention has a reliable design principle, a simple structure and a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0035] Figure 1 It is a schematic diagram of an application scenario of a time traceability calibration device according to an embodiment of the present invention.

[0036] Figure 2 It is a schematic diagram of a detection circuit of a time traceability calibration device according to an embodiment of the present invention.

[0037] Figure 3 Schematic diagram of a trigger circuit of a time traceability calibration device according to an embodiment of the present invention.

[0038] Figure 4 It is a schematic diagram of a detection circuit of a time traceability calibration device according to an embodiment of the present invention.

[0039] Figure 5 It is a schematic diagram of the architecture of the signal processing component of the time traceability calibration device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0042] like Figure 1 As shown, the time traceability calibration device includes:

[0043] A signal processing component, the signal processing component includes a controller and a time measurement module, and the controller is electrically connected to the time measurement module;

[0044] A trigger circuit, wherein the trigger module is electrically connected to the controller; the trigger circuit is electrically connected to the target device, and the trigger circuit sends a trigger signal to the target device based on the first control signal of the controller, wherein the trigger signal is used to trigger the target device to generate a pulse signal;

[0045] The detection circuit includes a plurality of detection branches, wherein the input ends of the plurality of detection branches are respectively electrically connected to the plurality of pulse signal output ends of the target device, the plurality of detection branches are respectively electrically connected to the plurality of power output ends, the plurality of power output ends are electrically connected to the controller, and the plurality of power output ends output voltages of corresponding magnitudes based on the power control signal of the controller; the detection branch generates a detection signal based on the pulse signal of the pulse signal output end and the voltage of the power output end; and the output end of the detection circuit is electrically connected to the sampling port of the signal processing component;

[0046] The controller obtains time data from the time measurement module and generates waveform data of high and low level signals changing with time based on the detection signal. The waveform data is used to calibrate the pulse signal.

[0047] The following is a detailed description of each part:

[0048] (1) Controller

[0049] Choose a microcontroller with sufficient input and output pins and processing power, such as a controller based on the ARM Cortex-M series, such as the STM32F407. This microcontroller has rich GPIO pins, high-speed timers, ADC and DAC functional modules, which can meet the control requirements of the system.

[0050] The controller is equipped with necessary peripheral circuits, including a power supply circuit (using a voltage regulator chip such as LM7805 to convert the external input power into a stable 5V voltage to power the controller), a crystal oscillator circuit (providing a stable clock signal, such as an 8MHz crystal oscillator), and a reset circuit (ensuring that the controller can be reset reliably).

[0051] Initialization program: When the system starts, the various modules of the controller are initialized, including the mode setting of the GPIO pin (input or output), the configuration of the timer (setting the counting frequency, working mode, etc.), the initialization of the ADC and DAC, etc.

[0052] Control signal generation program: Generate corresponding control signals according to the calibration process.

[0053] The first control signal is output through the GPIO pin and is used to control the trigger circuit to send a trigger signal to the target device. This signal can be a simple high-level or low-level pulse. The pulse width and interval can be set according to the requirements of the target device, for example, setting the pulse width to 100μs and the interval to 1ms.

[0054] Power control signal: This analog voltage signal is output by the DAC module and is used to control the voltage outputs of multiple power supply terminals. Based on the requirements of the detection circuit and the characteristics of the target device's pulse signal, different voltage values ​​are pre-set to correspond to the power supply terminals. For example, when the DAC output voltage is 1V, power supply terminal 1 outputs 5V, power supply terminal 2 outputs 3.3V, and so on.

[0055] The second control signal is output through the GPIO pin and is used to control the signal processing component to collect the detection signal generated by the detection circuit. This signal can be an enable signal. When the signal is at a high level, the signal processing component starts to collect the detection signal.

[0056] (2) Trigger circuit

[0057] Use a transistor or field-effect transistor as the trigger signal driver. For example, choose an NPN transistor (such as a 2N3904). Connect its base to the controller's first pin via a current-limiting resistor (such as 1kΩ), its emitter to ground, and its collector to a power supply (such as 5V) via a pull-up resistor (such as 10kΩ). This is then connected to the trigger input of the target device.

[0058] In order to improve the stability and anti-interference ability of the trigger signal, an RC filter circuit can be added to the output end of the trigger circuit. For example, a 100nF capacitor and a 100Ω resistor can be used to form a filter circuit, which is connected between the collector of the transistor and the ground.

[0059] When the controller outputs a first control signal (a high-level pulse), the transistor turns on and the collector outputs a low-level signal. This low-level signal acts as a trigger signal and is transmitted through the connection line to the trigger input terminal of the target device, triggering the target device to generate a pulse signal. When the controller's first control signal is low, the transistor turns off, the collector outputs a high-level signal, and the trigger signal disappears.

[0060] (3) Detection circuit

[0061] The detection circuit consists of multiple detection branches, each with a similar design. For example, the input of one detection branch is connected to a pulse signal output of the target device through a current-limiting resistor (e.g., 1kΩ), which is then connected to the non-inverting input of a comparator (e.g., LM393). The comparator's inverting input is connected to a voltage divider circuit consisting of two resistors (e.g., 10kΩ and 20kΩ), which is connected to the corresponding power supply output. The controller's power control signal controls the voltage output of the power supply, thereby changing the reference voltage at the comparator's inverting input. The comparator's output is connected to a power supply (e.g., 5V) through a pull-up resistor (e.g., 10kΩ) and then to the sampling port of the signal processing component.

[0062] In order to protect the detection circuit and signal processing components, a clamping diode (such as 1N4148) can be added to the input end of each detection branch to limit the voltage amplitude of the input signal and prevent excessive voltage from damaging circuit components.

[0063] When the target device outputs a pulse signal, it passes through a current-limiting resistor and enters the comparator's non-inverting input. Simultaneously, the controller outputs a power control signal based on calibration requirements, controlling the corresponding power supply output to generate a corresponding voltage. This voltage then passes through a voltage divider circuit and forms a reference voltage at the comparator's inverting input.

[0064] If the target device's pulse signal voltage is higher than the reference voltage at its inverting input, the comparator outputs a high level; otherwise, it outputs a low level. This way, the detection circuit converts the target device's pulse signal into high- and low-level signals. Multiple detection branches allow for simultaneous detection of signals at multiple pulse signal output terminals of the target device, transmitting these high- and low-level signals to the sampling ports of the signal processing component.

[0065] (4) Signal processing components

[0066] Choose a chip or module with high-precision time measurement capabilities, such as an FPGA (Field-Programmable Gate Array)-based time-to-digital converter (TDC), such as the GP22 TDC. This chip offers extremely high time measurement accuracy (up to picoseconds) and multi-channel sampling capabilities, enabling precise measurement of pulse signal timing parameters.

[0067] Provide stable power supply and clock signal for signal processing components. The power supply can use the same power supply circuit as the controller, and the clock signal can be provided by an external high-precision crystal oscillator (such as 20MHz) to ensure the accuracy and stability of time measurement.

[0068] When the controller outputs the second control signal (enable signal), the signal processing unit begins collecting the high and low level signals output by the detection circuit. The sampling circuit within the signal processing unit samples the detection signal at a specific sampling frequency (e.g., 1 GHz) and stores the sampling results in an internal buffer.

[0069] After sampling is complete, the signal processing component generates waveform data based on the sampling results, showing the time-varying high and low-level signals. This waveform data includes timestamp information for each high- and low-level transition, accurately reflecting the timing characteristics of the target device's output pulse signal. The signal processing component transmits this waveform data to the controller via an interface (such as SPI or I2C) for subsequent calibration.

[0070] The calibration process of the time traceability calibration device includes:

[0071] (1) After the system is powered on, the controller is initialized, including the initialization settings of GPIO pins, timers, ADC, DAC and other modules.

[0072] (2) The controller outputs the power control signal through the DAC module, controls the multiple power output terminals to output voltages of corresponding magnitudes, and sets a suitable reference voltage for the detection circuit.

[0073] (3) The controller outputs a first control signal, the trigger circuit sends the trigger signal to the target device, and the target device generates a pulse signal.

[0074] (4) The detection circuit converts the pulse signal output by the target device into high and low level signals and transmits them to the sampling port of the signal processing component.

[0075] (5) The controller outputs a second control signal, and the signal processing component starts to collect the detection signal generated by the detection circuit and generates waveform data of the high and low level signals changing with time.

[0076] (6) The signal processing component transmits the waveform data to the controller, which analyzes and processes the waveform data, extracts the time parameters of the pulse signal (such as pulse width, rise time, fall time, pulse interval, etc.), and compares them with the time parameters of the standard pulse signal to calculate the error value.

[0077] (7) Based on the error value, the controller can calibrate the pulse signal of the target device by adjusting the trigger signal parameters of the trigger circuit, the reference voltage of the detection circuit, etc., until the pulse signal output by the target device meets the calibration requirements.

[0078] (8) After the calibration is completed, the controller can transmit the calibration results (including pulse signal parameters and error values ​​before and after calibration) to the host computer through the serial port, USB and other interfaces for display and storage, which is convenient for users to view and analyze.

[0079] In a preferred embodiment, the controller is electrically connected to a host computer via a high-speed serial bus. The host computer is used for parameter setting, data analysis, and display. This connection allows for faster analysis of calibration data and more intuitive display of calibration results.

[0080] Specifically, the host computer includes an input component and a display component, the input component is used to set the trigger voltage of the trigger circuit, and the display component is used to display the waveform data; the host computer also includes an analysis module, which is used to compare the consistency of the pre-stored standard pulse signal with the time period of the waveform data.

[0081] The host computer's input component is a powerful and user-friendly human-computer interaction interface, providing users with a convenient way to set the trigger circuit's trigger voltage. This input component can be an intuitive graphical user interface (GUI), developed using modern software development tools such as Qt or Visual Studio. Within this interface, users can precisely set the trigger circuit's trigger voltage using controls such as sliders and input boxes. These controls offer excellent interactivity and real-time feedback. As users drag a slider or enter a value in an input box, the interface displays the current trigger voltage in real time and performs a validity check to ensure that the input value is within the system's permitted range. For example, the trigger voltage can be set from 0V to 10V in 0.1V increments. Furthermore, the input component can provide preset voltage values, allowing users to quickly select commonly used trigger voltages and improving operational efficiency.

[0082] The display component is a key window into the host computer, providing a clear and intuitive display of waveform data. Utilizing high-performance graphical display technology, it can present waveform data in a variety of formats to meet diverse user observation and analysis needs. For example, the display component can dynamically display waveform data in real time, allowing users to see the waveform continuously updating and changing over time. Waveforms can be displayed with a variety of colors and line styles, allowing users to distinguish between different channels or different types of pulse signals. The display component also provides zooming and panning functions. Users can use the mouse wheel or buttons on the toolbar to zoom in or out on the waveform for closer inspection, or drag the mouse to pan the waveform to view waveforms over different time periods. Furthermore, the display component can display key waveform parameters, such as peak, valley, average, and period. These parameters can be displayed digitally in real time alongside the waveform or in a dedicated parameter display area, allowing users to quickly access important waveform information.

[0083] The analysis module, one of the core intelligent modules of the host computer, is responsible for comparing the time periods of pre-stored standard pulse signals with those of waveform data. First, the analysis module reads the pre-stored standard pulse signal data from the system's storage area. These standard pulse signals are rigorously calibrated and verified, with accurate parameters such as the time period. The analysis module then pre-processes the waveform data transmitted from the signal processing unit, including filtering and noise reduction, to improve data quality and accuracy. Next, the analysis module uses a high-precision time measurement algorithm to extract the time period information of both the standard pulse signal and the waveform data. During the comparison process, the analysis module calculates the difference between the time periods of the two signals and compares this difference with a pre-set threshold. If the difference is less than the threshold, the waveform data's time period is considered to be highly consistent with the standard pulse signal's, and the system can determine that the target device's pulse signal meets the time period requirements. Conversely, if the difference is greater than the threshold, it indicates a deviation in the waveform data's time period, and the system will issue a corresponding prompt, prompting the user to further inspect and calibrate the target device. In addition, the analysis module can also generate a detailed comparison report, which contains information such as the time period parameters, difference, and comparison results of the standard pulse signal and waveform data. Users can save the report through the file storage function of the host computer for subsequent review and analysis.

[0084] Specifically, the analysis method of the analysis module includes:

[0085] Obtain the standard period T of the standard pulse signal, and the high-level state duration t1 and the low-level state duration t2 within the standard period.

[0086] The waveform data received from the controller is mapped to the display interface, and each sampling point in the waveform is mapped to a screen coordinate point.

[0087] Establish a waveform detection thread, which obtains the level state and duration of the displayed waveform from the initial waveform acquisition time. For example, first detect the high level duration t1' and low level duration t2' of a cycle, and calculate the time difference:

[0088]

[0089]

[0090] like If d is greater than 0, the difference d between the time t corresponding to the sampling point and the sampling times t0 and t1 of the first high-level sampling point in this cycle is calculated, that is, d = t-t0-t1. If d>0, the display color of the screen coordinate point corresponding to the sampling point is red; if d<0, the display color of the screen coordinate point corresponding to the sampling point is green.

[0091] like If it is less than 0, the display color of the screen coordinate point corresponding to the high-level sampling point in the cycle is set to yellow.

[0092] Similarly, for low-level sampling points, the same display method is used:

[0093] like If d' is greater than 0, the difference d' between the time t' corresponding to the sampling point and the sampling times t0' and t1' of the first low-level sampling point in this cycle is calculated. If d'>0, the display color of the screen coordinate point corresponding to the sampling point is red; if d'<0, the display color of the screen coordinate point corresponding to the sampling point is green.

[0094] like If it is less than 0, the display color of the screen coordinate point corresponding to the low-level sampling point in the cycle is set to yellow.

[0095] In this way, abnormal points can be highlighted, and segmented abnormality verification will not cause inaccurate analysis due to error accumulation.

[0096] By analyzing the abnormal level segments of the abnormal period, we can deeply analyze the error factors and provide a more appropriate time calibration solution.

[0097] Error factor analysis logic:

[0098] Cycle time difference level:

[0099] If the calculated time period difference between the standard pulse signal and the waveform data exceeds a preset threshold, this indicates a time period deviation. In this case, a thorough comparison of the standard period T, high-level duration, and low-level duration with the corresponding high-level and low-level durations in the waveform data is performed to determine whether the deviation primarily stems from the high-level portion, the low-level portion, or the overall period.

[0100] If the difference between t1 and t1' is large, it means that the high-level duration may be affected by factors such as internal circuit delay and signal interference of the target device; if the difference between t2 and t2' is large, the low-level duration may have similar problems.

[0101] Sampling point time deviation: Analyze the time difference d or d' corresponding to the sampling point. When d > 0 or d' > 0, the sampling point is delayed, possibly due to signal transmission delays or excessive sampling circuit response time. When d < 0 or d' < 0, the sampling point is advanced, possibly due to factors such as signal leading edge jitter or clock signal instability. By observing the distribution of the sampling points displayed in red and green, it can be determined whether the deviation is concentrated in specific areas. If so, it indicates that there may be problems with the circuit or link corresponding to this area.

[0102] Abnormal level segments: Abnormal level segments displayed in yellow indicate that the overall level duration within that period does not meet the standard. Analyze the distribution of these abnormal periods within the waveform. If they appear periodically, this may be related to periodic failures in the target device's clock source or specific circuits. If they appear randomly, it may be caused by external interference, power supply fluctuations, or other factors.

[0103] Methods for developing a time alignment plan:

[0104] Cycle Time Deviation Calibration: If the overall time cycle deviation is large, adjust the target device's clock source. If the clock frequency is too high, reduce it appropriately; if it is too low, increase it. To address high or low level duration deviations, adjust the parameters of the target device's internal circuits. For example, adjusting the capacitor and resistor values ​​in the pulse generation circuit can change the signal's charge and discharge time to correct the level duration.

[0105] Sampling point time deviation calibration: If the sampling point is delayed, optimize the signal transmission line to reduce transmission delay. For example, shorten the line length or use a low-latency transmission medium. Also, check the sampling circuit's response time and adjust the sampling chip parameters or replace it with a higher-performance sampling chip. If the sampling point is advanced, filter the clock signal to reduce signal leading-edge jitter. Alternatively, adjust the clock source stability, such as using a high-precision crystal oscillator.

[0106] Abnormal voltage level calibration: For periodic abnormal voltage levels, focus on troubleshooting circuits related to the clock source, such as the crystal oscillator circuit and clock divider circuit, and repair or replace faulty components. For random abnormal voltage levels, check for external interference sources, such as electromagnetic interference (EMI) and power supply fluctuations. Shielding measures can be implemented to reduce EMI, and power supply filtering circuits can be added to stabilize the power supply voltage.

[0107] In one embodiment of the present invention, in order to ensure that the trigger signal output by the trigger circuit is a set voltage value, a detection circuit is added, such as Figure 2 shown.

[0108] The trigger circuit is electrically connected to a switch component of a target device through an output terminal, such as a closing or opening terminal of a high-voltage switch tester calibration device under test, and the output terminal of the trigger circuit is also electrically connected to a detection terminal of a detection circuit;

[0109] The detection end includes a first voltage-dividing resistor R44 and a second voltage-dividing resistor R50 connected in series, an end of the first voltage-dividing resistor R44 that is not electrically connected to the second voltage-dividing resistor R50 is electrically connected to a first electrode of the output end of the trigger circuit; a node between the first voltage-dividing resistor R44 and the second voltage-dividing resistor R50 is electrically connected to a first input end of a first photocoupler IC4; a second electrode of the output end of the trigger circuit is electrically connected to one end of a reference circuit via a first resistor R46, and the other end of the reference circuit is electrically connected to a second input end of the first photocoupler IC4;

[0110] The two ends of the reference circuit are electrically connected to the two electrodes of the filter capacitor C48 respectively; the reference circuit includes a second resistor R60, one end of the second resistor R60 is electrically connected to one end of the reference circuit, the other end of the second resistor R60 is electrically connected to one end of the adjustable resistor RP2, the other end of the adjustable resistor RP2 is electrically connected to the A end of the three-terminal adjustable shunt reference source IC7, and the node between the adjustable resistor RP2 and the three-terminal adjustable shunt reference source IC7 is grounded; the R end of the three-terminal adjustable shunt reference source IC7 is electrically connected to one end of the second resistor R2; the K end of the three-terminal adjustable shunt reference source IC7 is the other end of the reference circuit;

[0111] The first output terminal of the first photocoupler IC4 is electrically connected to the pull-up resistor R45, and the first output terminal of the first photocoupler is also connected to the controller; the ground output terminal of the first photocoupler IC4 is grounded through the grounding resistor R58, and the grounding resistor R58 is connected in parallel to the protection capacitor C49.

[0112] Specifically, PC817 (IC4): This is a photocoupler, consisting of a light-emitting diode and a phototransistor, used to achieve electrical isolation while also transmitting signals. In the circuit, it converts electrical signals at the input into optical signals and then converts the optical signals back into electrical signals at the output, thus isolating the input and output and preventing interference.

[0113] The TL431 (IC7) is a three-terminal adjustable shunt reference that provides a stable reference voltage. In this circuit, it works with other components to detect and stabilize the output voltage.

[0114] Resistors (R44, R45, R50, R58, R60, RP2):

[0115] R44 (10kΩ / 0.25W): Together with R50, it forms a voltage divider circuit, which is used to divide the output voltage (VOUT) and provide it to the reference terminal of TL431.

[0116] R45 (1KΩ / 0.25W): Connected between the 5V power supply and the input terminal of PC817, it plays a current limiting role, limiting the current flowing into the PC817 light-emitting diode.

[0117] R50 (1KΩ / 0.25W): Divides the voltage with R44 and feeds back part of the output voltage to TL431.

[0118] R58 (1KΩ / 0.25W): One end is connected to the output end of PC817, and the other end is grounded. It cooperates with PC817 to play the role of signal transmission and level conversion.

[0119] R60 (5.1KΩ / 0.25W): connected in series with RP2, provides bias current for TL431, and participates in voltage division, affecting the reference voltage setting of TL431.

[0120] RP2 (500Ω): is an adjustable resistor that works with R60 to fine-tune the reference voltage of TL431, thereby adjusting the detection threshold of the entire detection circuit.

[0121] Capacitors (C48, C49):

[0122] C48 (100nF / 50V): is a filter capacitor used to filter out high-frequency noise in the output voltage, making the output voltage more stable and smooth.

[0123] C49 (1nF / 50V): Connected between the input terminal of PC817 and ground, it plays the role of filtering and anti-interference to ensure the stability of the input signal.

[0124] When the output voltage (VOUT) is normal, the voltage divided by R44 and R50 is compared with the TL431's reference voltage. If the divided voltage is higher than the TL431's reference voltage (set by R60 and RP2), the TL431 turns on, and the voltage at its cathode (K terminal) decreases, causing the PC817's LED current to increase. This in turn increases the conduction level of the PC817's phototransistor, lowering the voltage at the output terminal (pin 3) and outputting a low-level signal to subsequent circuits (such as ADC1), indicating that the output voltage is normal.

[0125] When the output voltage (VOUT) rises above the set threshold, the voltage divided by R44 and R50 increases further, the conduction degree of TL431 deepens, the output voltage of PC817 decreases further, and the output low-level signal becomes more obvious. The subsequent circuit can perform corresponding processing based on this signal, such as alarm or output adjustment.

[0126] On the contrary, when the output voltage (VOUT) decreases, the voltage divided by R44 and R50 is lower than the reference voltage of TL431, TL431 is cut off, the light-emitting diode current of PC817 decreases, the conduction degree of the phototransistor decreases, the output voltage increases, and a high-level signal is output to the subsequent circuit, indicating that the output voltage is abnormal.

[0127] The detection circuit inputs the measurement result into the controller by referring to the adjustable resistor RP2, and the controller adaptively adjusts the magnitude of the power supply voltage of the trigger circuit based on the measurement result.

[0128] In one embodiment, the trigger circuit is as follows Figure 3 Shown, including:

[0129] a second photocoupler IC5, wherein a first input terminal of the second photocoupler IC5 is electrically connected to a first pin, the first pin transmits a control signal PA0, a line node between the first input terminal of the second photocoupler IC5 and the first pin is connected to a pull-up resistor R47; and a second input terminal of the second photocoupler IC5 is grounded;

[0130] A first output terminal of the second photocoupler IC5 is grounded, and a second output terminal of the second photocoupler IC5 is electrically connected to the gate of the field-effect transistor Q2 via a voltage-divider resistor R52. The node between the second output terminal of the second photocoupler IC5 and the voltage-divider resistor R52 is also connected to the power bus via a protection resistor R48. A source of the field-effect transistor Q2 is grounded, and a drain of the field-effect transistor Q2 is connected to a first electrode of the output terminal VOUT. The first electrode of the output terminal VOUT is also connected to the power bus VBUS via an inductor L4. A second electrode of the output terminal VOUT is grounded via a parallel resistor R49 and a capacitor CE7.

[0131] Specifically, the TLP172 (IC5): This is a photocoupler, consisting of a light-emitting diode and a phototransistor, used for electrical isolation and signal transmission. It converts electrical signals on the input side into optical signals and then converts the optical signals back into electrical signals on the output side, thus isolating the input and output circuits and preventing interference.

[0132] Resistors (R47, R48, R52, R49):

[0133] R47 (5.1KΩ): Connected between the 3.3V power supply (3V3) and the input terminal of TLP172 (pin 1), it plays a current limiting role, limiting the current flowing into the TLP172 light-emitting diode.

[0134] R48 (100KΩ): One end is connected to VBUS, and the other end is connected to the output end (pin 4) of TLP172. Together with R52, it forms a voltage divider circuit to provide bias voltage for the gate (G) of the subsequent field effect transistor (Q2).

[0135] R52 (5.1KΩ): Divides the voltage with R48 and provides it to the gate of the field effect tube. It also plays a certain current limiting role to protect the gate of the field effect tube.

[0136] R49 (100KΩ): Connected between the output voltage (VOUT) and ground (PGND), it may be used for voltage division or as part of the load, depending on the function of the entire circuit.

[0137] Inductor (L4): The inductance is 5.6 μH and the rated current is 4 A. It is typically used in circuits for filtering, energy storage, or in conjunction with a capacitor in a switching power supply to form an LC filter circuit to smooth the output voltage.

[0138] Capacitor (CE7): The capacitance is 100μF and the withstand voltage is 450V. It is a large-capacity electrolytic capacitor, mainly used for filtering, filtering out low-frequency ripple in the output voltage, and making the output voltage more stable.

[0139] Field-effect transistor (Q2, IPB081R0K2C3): This is a power field-effect transistor used to control the current flow in the circuit. Its source (S) is connected to ground (PGND), its drain (D) is connected to the output (VOUT), and its gate (G) receives the control signal through resistors R48 and R52.

[0140] When the input signal PA0 (PWM) is high, the TLP172's LED turns on, emitting light. This light-sensitive transistor turns on, causing the voltage at the TLP172's output (pin 4) to decrease. At this point, after voltage division by resistors R48 and R52, the gate (G) voltage of field-effect transistor Q2 increases, reaching its turn-on threshold, turning the field-effect transistor on. VBUS supplies power to the output (VOUT) through inductor L4 and the turned-on field-effect transistor Q2. Simultaneously, inductor L4 stores energy, and capacitor CE7 charges, providing a stable output voltage for the load.

[0141] When the input signal PA0 (PWM) is low, the TLP172's light-emitting diode (LED) and phototransistor (PT) are turned off. The voltage at the TLP172's output (pin 4) increases, and the gate (G) voltage of FET Q2 decreases, turning the FET off. At this point, the energy stored in inductor L4 is released through the freewheeling diode (not shown in the figure; it's typically located inside or outside the FET), continuing to power the output (VOUT). Simultaneously, capacitor CE7 discharges, maintaining a stable output voltage.

[0142] The circuit uses a photocoupler to achieve electrical isolation between input and output, a field-effect transistor as a switching element, and inductors and capacitors for filtering and energy storage to achieve a stable voltage output.

[0143] In summary, the power supply VBUS is rectified, filtered, and stabilized to form a voltage output signal. This output signal is switched on and off by a controller through an amplifier circuit. A measurement feedback circuit is also integrated into the output signal to control the signal amplitude. This is a specific signal generator used to drive the high-voltage switch tester and time measurement module being calibrated.

[0144] During the calibration process, VOUT is connected to the closing or opening terminal of the high-voltage switch tester calibration device under test, depending on the calibration requirements. The corresponding terminal of the calibration device under test is grounded. Before the test begins, the system power supply circuit adjusts the output voltage of the trigger circuit. The voltage value is output to the controller via the feedback measurement circuit and simultaneously displayed on the host computer. After the host computer issues a test signal, the controller receives the test signal and outputs a low-level signal through the controller's PA0 terminal to turn off the optocoupler unit. After the optocoupler unit opens, VBUS pulls resistor R52 to a high level, turning on the MOS transistor and outputting the trigger voltage. Simultaneously, the trigger signal is introduced through the feedback measurement circuit, passed through the optocoupler unit IC4, and then input into the time measurement module, triggering the time measurement module's test function. The controller can be a single-chip microcomputer.

[0145] In one embodiment of the present invention, the detection circuit includes multiple detection branches, the input ends of the multiple detection branches are respectively electrically connected to the multiple pulse signal output ends (JC1, JC2, JC3) of the target device, the multiple detection instructions are respectively electrically connected to the multiple power output ends, the multiple power output ends are electrically connected to the controller, and the multiple power output ends output voltages of corresponding magnitudes based on the power control signal of the controller; the output end of the detection circuit is electrically connected to the sampling port (PB3, PB4, PB5) of the signal processing component.

[0146] Please refer to Figure 4 The structure of the detection branch is the same, and the detection branch corresponding to JC1 is used as an example for explanation. The detection branch includes:

[0147] a third photocoupler IC3, wherein a first input terminal of the third photocoupler IC3 is electrically connected to a power supply output terminal, and the power supply output terminal includes a protective resistor R41 connected in series; the first input terminal of the third photocoupler IC3 is also electrically connected to a pulse signal output terminal JC1 of the target device as an input terminal of a detection branch, and the power supply output terminal is connected in parallel with the pulse signal output terminal JC1 of the target device; and a second input terminal of the third photocoupler IC3 is grounded;

[0148] A first output terminal of the third photocoupler IC3 is grounded, and a second output terminal of the third photocoupler IC3 is electrically connected to a sampling port PB1 of the signal processing component via a voltage divider resistor R43. A line node between the second output terminal of the third photocoupler IC3 and the voltage divider resistor R43 is connected to a 3.3V pull-up power supply, which includes a protection resistor R42.

[0149] Connect the VOUT terminal to the 5V voltage provided by the system power supply; JC1, JC2, and JC3 connect to terminals ABC of the high-voltage switch tester calibration device under test; R41, R54, and R61 are current-limiting resistors, and IC3, IC8, and IC9 are optoelectronic isolation units. R42, R43, R56, R57, R62, and R63 are current-limiting resistors. During calibration, connect JC1, JC2, and JC3 to measurement terminals ABC of the high-voltage switch tester calibration device under test, and the corresponding terminals of the calibration device under test to ground. Their primary function is to detect the on / off status of the ABC circuit of the high-voltage switch tester calibration device. When the internal time relay of the calibration device under test is open, JC1, JC2, and JC3 are high, the optoelectronic isolation unit is turned on, and PB3, PB4, and PB5 are low. When the internal time relay of the calibration device under test is closed, JC1, JC2, and JC3 are grounded and low, the optoelectronic isolation unit is turned off, and PB3, PB4, and PB5 are high.

[0150] When the external relay contacts (connected via JC1, JC2, and JC3 on CON5) are in a certain state (for example, closed), the output voltage (VOUT) flows through the current-limiting resistors (R41, R54, and R61) into the corresponding photodiodes of the optocouplers (IC3, IC8, and IC9), causing them to emit light. When the LEDs emit light, the phototransistors within the photocouplers are turned on by the light, causing the voltage at the output of the optocouplers (pin 4) to decrease.

[0151] This changing voltage is transmitted to subsequent connection points (PB3, PB4, and PB5) via the output voltage divider resistors (R42 and R43, R56 and R57, and R62 and R63). Subsequent circuitry can detect the state of the external relay contacts based on the voltage changes at these connection points. For example, if the voltage at PB3 drops below a certain level, the corresponding relay contact (connected via JC1) is closed; otherwise, it is open.

[0152] This circuit mainly monitors the status of external relay contacts through a photoelectric coupler, and uses the electrical isolation characteristics of the photoelectric coupler to avoid interference from external circuits on internal circuits. At the same time, the monitored status signal is transmitted to subsequent circuits for processing and judgment through a resistor divider circuit.

[0153] In one embodiment of the present invention, the signal processing component includes:

[0154] Front-end signal conditioning circuit: Attenuation / gain adjustment module: used to automatically or manually adjust the input signal amplitude to match the input range of the A / D converter to ensure that the signal can be accurately converted.

[0155] Filtering module: removes unnecessary high-frequency noise or low-frequency interference from the input signal, improves signal quality, and ensures the accuracy of subsequent processing.

[0156] Impedance matching module: Ensures input impedance matching to minimize signal reflections, reduce signal loss and distortion.

[0157] High-precision analog-to-digital converter (ADC): With 14-bit resolution, it converts continuous analog signals into discrete digital signals while preserving time and amplitude information. The sampling rate is 250 MS / s and the memory depth is 1.5 Gs.

[0158] FPGA (Xilinx Kintex-7): As the core control unit of the entire system, it is responsible for coordinating the work of various modules, including controlling ADC sampling, processing data, and communicating with the host computer.

[0159] System Monitoring Module (SystemMonitoring): monitors the system temperature (including the temperature of ADC, FPGA, DRAM, etc. and the board temperature) and power supply (3.3V and 12V) to ensure the normal operation of the system.

[0160] On-board clock PLL (On-board Clock PLL): Provides stable clock signals for the system, including the sampling clock, to ensure the timing accuracy of each module.

[0161] Time-to-Digital Converter: This may be used to assist with time measurement or other time-related functions, but its specific connections and functions are not clear in the figure.

[0162] PXI Express backplane interfaces: including PXIe Gen2 x8, DRAM Bank 0, DRAM Bank 1, SRAM, nonvolatile memory (EEPROM, Flash), PXI Triggers, DSTAR_B, DSTAR_C, PXIe_CLK_100, DSTAR_A, and PXI_CLK_10. These interfaces are used for high-speed data transmission and communication with external devices or systems, as well as for receiving external trigger signals.

[0163] Auxiliary input and output interface (AUX IO): includes CLK IN, CLK OUT, 8x PFI, etc., used to connect external clock signals or other auxiliary signals.

[0164] The specific connection structure includes:

[0165] The outer port of the RF coaxial connector (BNC interface) is electrically connected to the sampling port of the detection circuit; the inner port of the RF coaxial connector is electrically connected to the input end of the front-end signal conditioning circuit, which is used to attenuate and gain adjust, filter and impedance match the sampling signal; the output end of the front-end signal conditioning circuit is electrically connected to the input end of the analog-to-digital converter ADC, and the analog-to-digital converter includes a cache medium, which is used to store digital signals; the output end of the analog-to-digital converter communicates with the controller (FPGA); the controller communicates with the onboard clock; and the controller communicates with the memory.

[0166] The signal processing unit utilizes 8 channels of communication to receive external analog signal inputs with a 250MHz bandwidth and BNC input connectors. At the input, the signal passes through the front-end signal conditioning circuitry, including attenuation / gain adjustment to automatically or manually adjust the input signal amplitude to match the input range of the A / D converter; filtering to remove unwanted high-frequency noise or low-frequency interference; and impedance matching to ensure input impedance matching to minimize signal reflections. The conditioned analog signal then enters the high-precision analog-to-digital converter (ADC). The signal processing unit features a 14-bit ADC, which converts the continuous analog signal into a discrete digital signal, preserving time and amplitude information. The sampling rate is 250 MS / s, and the memory depth is 1.5 GS.

[0167] During the calibration process, CH1, CH2, and CH3 of the voltage trigger module of the signal processing component are connected to the output levels PB3, PB4, and PB5 of the voltage driving circuit, and CH4 is connected to PA1 of the voltage trigger module. When the trigger signal sent by PA1 is received, the signal processing component starts timing and stores the measured data and transmits it to the host computer.

[0168] After the host computer receives the data from the signal processing component, the software function fits the data into a voltage graph. The host computer screen has a time measurement scale line, which can measure the time difference between any two positions on the screen and improve the time resolution through the graphic zoom function.

[0169] When the sampling rate of the present invention is set to 250 MS / s, the sampling data is sampled 250 times per microsecond, that is, the time resolution can reach 1 / 250 microsecond, which can meet the time measurement requirements of the millisecond level.

[0170] This signal processing component achieves high-precision time measurement of external analog signals through front-end signal conditioning, high-precision analog-to-digital conversion, FPGA control and processing, and host computer display, and can meet traceability-level time calibration requirements.

[0171] The present invention also provides a high-voltage switch tester calibration device, comprising:

[0172] A signal generator module, configured to generate a calibration signal, wherein the calibration signal includes a pulse signal, a voltage signal, and a current signal;

[0173] An interface module is used to establish a communication channel with the high-voltage switch tester under test;

[0174] Sending a calibration signal to the high-voltage switch tester under test based on the communication channel, and collecting measurement data of the calibration signal by the high-voltage switch tester under test;

[0175] A time traceability calibration device is used to calibrate the signal generator module.

[0176] Among them, the signal generator module contains the following parts:

[0177] Waveform Generator: Generates basic waveforms, such as sine waves, square waves, etc.

[0178] Amplitude regulator: adjusts the amplitude of the signal.

[0179] Frequency regulator: adjusts the frequency of the signal.

[0180] Signal amplifier: Amplifies the generated signal to meet calibration requirements.

[0181] The interface module consists of the following parts:

[0182] Communication interface: such as USB, serial port, Ethernet, etc., used to communicate with the target device.

[0183] Signal transmitter: sends the generated calibration signal to the target device.

[0184] Data collector: collects the measurement data of the target device for the calibration signal.

[0185] The time traceability calibration device includes:

[0186] A controller, wherein a first pin of the controller is electrically connected to a trigger circuit; the trigger circuit is electrically connected to a target device, and the trigger circuit sends a trigger signal to the target device based on a first control signal of the controller, wherein the trigger signal is used to trigger the target device to generate a pulse signal;

[0187] A detection circuit, wherein the detection circuit includes multiple detection branches, the input ends of the multiple detection branches are respectively electrically connected to the multiple pulse signal output ends of the target device, the multiple detection instructions are respectively electrically connected to the multiple power output ends, the multiple power output ends are electrically connected to the controller, and the multiple power output ends output voltages of corresponding magnitudes based on the power control signal of the controller; the output end of the detection circuit is electrically connected to the sampling port of the signal processing component;

[0188] The signal processing component is electrically connected to the second pin of the controller. The signal processing component collects the detection signal generated by the detection circuit based on the second control signal of the controller, and generates waveform data of high and low level signals that change with time based on the detection signal. The waveform data is used to calibrate the pulse signal.

[0189] The high-voltage switch tester calibration equipment provided in this embodiment is equipped with a time traceability calibration device, which can perform traceability-level time calibration on the signal generator module, thereby avoiding calibration failures due to time errors.

[0190] Although the present invention has been described in detail with reference to the accompanying drawings and in conjunction with preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, persons of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall be within the scope of the present invention. Any changes or substitutions that can be easily conceived by persons skilled in the art within the technical scope disclosed in the present invention shall be within the scope of protection of the present invention.

Claims

1. A time traceability calibration device, characterized in that: include: a signal processing component, the signal processing component including a controller and a time measurement module, the controller being electrically connected to the time measurement module; a trigger circuit, the trigger circuit being electrically connected to the controller; the trigger circuit being electrically connected to the target device, the trigger circuit sending a trigger signal to the target device based on a first control signal from the controller, the trigger signal being used to trigger the target device to generate a pulse signal; A detection circuit, wherein the detection circuit includes multiple detection branches, the input ends of the multiple detection branches are respectively electrically connected to the multiple pulse signal output ends of the target device, the multiple detection branches are respectively electrically connected to the multiple power output ends, the multiple power output ends are electrically connected to a controller, and the multiple power output ends output voltages of corresponding magnitudes based on the power control signal of the controller; the detection branch generates a detection signal based on the pulse signal of the pulse signal output end and the voltage of the power output end; the output end of the detection circuit is electrically connected to the sampling port of the signal processing component; The controller obtains time data from the time measurement module and generates waveform data of high and low level signals changing with time based on the detection signal, and the waveform data is used to calibrate the pulse signal; The trigger circuit comprises: a second photoelectric coupler, wherein a first input terminal of the second photoelectric coupler is electrically connected to the first pin, a line node between the first input terminal of the second photoelectric coupler and the first pin is connected to a pull-up resistor; and a second input terminal of the second photoelectric coupler is grounded; The first output terminal of the second photoelectric coupler is grounded, the second output terminal of the second photoelectric coupler is electrically connected to the gate of the field effect tube via a voltage divider resistor, and the node between the second output terminal of the second photoelectric coupler and the voltage divider resistor is also connected to the power bus via a protection resistor; the source of the field effect tube is grounded, the drain of the field effect tube is connected to the first electrode of the output terminal, and the first electrode of the output terminal is also connected to the power bus via an inductor; the second electrode of the output terminal is grounded via a parallel resistor and a capacitor.

2. The time traceability calibration device according to claim 1, characterized in that: The controller is electrically connected to the host computer via a high-speed serial bus.

3. The time traceability calibration device according to claim 2, characterized in that: The host computer includes an input component and a display component, the input component is used to set the trigger voltage of the trigger circuit, and the display component is used to display waveform data; the host computer also includes an analysis module, which is used to compare the consistency of the time period of the pre-stored standard pulse signal with the waveform data.

4. The time traceability calibration device according to claim 1, characterized in that: The trigger circuit is electrically connected to the switch component of the target device via the output terminal, and the output terminal of the trigger circuit is also electrically connected to the detection terminal of the detection circuit; The detection end includes a first voltage-dividing resistor and a second voltage-dividing resistor connected in series, one end of the first voltage-dividing resistor that is not electrically connected to the second voltage-dividing resistor is electrically connected to a first electrode of an output end of a trigger circuit; a node between the first voltage-dividing resistor and the second voltage-dividing resistor is electrically connected to a first input end of a first photoelectric coupler; a second electrode of the output end of the trigger circuit is electrically connected to one end of a reference circuit via the first resistor, and the other end of the reference circuit is electrically connected to a second input end of the first photoelectric coupler; The two ends of the reference circuit are electrically connected to the two poles of the filter capacitor respectively; The reference circuit includes a second resistor, one end of the second resistor is electrically connected to one end of the reference circuit, the other end of the second resistor is electrically connected to one end of the adjustable resistor, the other end of the adjustable resistor is electrically connected to the A end of the three-terminal adjustable shunt reference source, and the node between the adjustable resistor and the three-terminal adjustable shunt reference source is grounded; the R end of the three-terminal adjustable shunt reference source is electrically connected to one end of the second resistor; and the K end of the three-terminal adjustable shunt reference source is the other end of the reference circuit; The input end of the first photoelectric coupler is electrically connected to the pull-up resistor, the first output end of the first photoelectric coupler is also connected to the controller, the ground output end of the first photoelectric coupler is grounded through a grounding resistor, and the grounding resistor is connected in parallel with the protection capacitor.

5. The time traceability calibration device according to claim 1, characterized in that: The detection branch comprises: a third photoelectric coupler, wherein a first input terminal of the third photoelectric coupler is electrically connected to a power supply output terminal, the power supply output terminal including a protective resistor connected in series; the first input terminal of the third photoelectric coupler is also electrically connected to a pulse signal output terminal of a target device as an input terminal of a detection branch, the power supply output terminal and the pulse signal output terminal of the target device are connected in parallel; and a second input terminal of the third photoelectric coupler is grounded; The first output end of the third photoelectric coupler is grounded, and the second output end of the third photoelectric coupler is electrically connected to the sampling port of the signal processing component via a voltage divider resistor; the line node between the second output end of the third photoelectric coupler and the voltage divider resistor is connected to a 3.3V pull-up power supply.

6. The time traceability calibration device according to claim 1, characterized in that: The signal processing component includes: An RF coaxial connector, wherein the outer port of the RF coaxial connector is electrically connected to the sampling port of the detection circuit; the inner port of the RF coaxial connector is electrically connected to the input end of the front-end signal conditioning circuit, and the front-end signal conditioning circuit is used to attenuate and gain adjust, filter and impedance match the sampling signal; the output end of the front-end signal conditioning circuit is electrically connected to the input end of the analog-to-digital converter, and the analog-to-digital converter includes a cache medium, and the cache medium is used to store digital signals; the output end of the analog-to-digital converter communicates with the controller; the controller communicates with the onboard clock; and the controller communicates with the memory.

7. A high voltage switch tester calibration device, characterized in that: include: A signal generator module, configured to generate a calibration signal, wherein the calibration signal includes a pulse signal, a voltage signal, and a current signal; An interface module is used to establish a communication channel with the high-voltage switch tester under test; Sending a calibration signal to the high-voltage switch tester under test based on the communication channel, and collecting measurement data of the calibration signal by the high-voltage switch tester under test; A time traceability calibration device, used to calibrate the signal generator module; the time traceability calibration device is the time traceability calibration device according to any one of claims 1 to 6.

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