Test system and method for calibrating high-power large-current parameters

Abstract

The invention provides a test system and method for calibrating high-power large-current parameters, and belongs to the technical field of power electronic component testing and metering, and the system comprises a high-power large-current standard device, a standard current sensor and a high-speed data acquisition unit. The high-power large-current standard device is used for providing high-power large current for the load to be tested; and the standard current sensor and the high-speed data acquisition unit are used for calibrating the large current of the high-power large-current standard device. The high-power large-current parameter traceability is realized, and the high-power large-current parameter quantity value is ensured to be accurate and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of power electronic component testing and measurement, and in particular relates to a testing system and method for calibrating high-power and high-current parameters. Background Art

[0002] High-power technology is one of the typical applications of advanced energy, including capacitor energy storage, inductor energy storage pulse power source, etc. It is an important application of energy storage and instantaneous release, and is widely used in various fields of weapons and equipment, such as electromagnetic guns, electromagnetic launch, thermonuclear fusion, high-power lasers, particle accelerators, etc. The unipolar pulse large current measurement technology is a key technology for studying single unipolar pulse current measurement in high-power related fields. Its key parameters include pulse current amplitude, pulse width, etc.; indirect parameters can be extended to various specific application fields, such as the field of electromagnetic launch, which can be extended to energy range, pulse front, acceleration, speed, etc.

[0003] Traditional methods for measuring key parameters of unipolar large pulse current include broadband shunts, Pearson coils, etc. As the amplitude of pulse current continues to increase, traditional methods are subject to many problems when measuring large pulse currents, such as extremely serious electromagnetic interference, making it difficult to accurately measure signals; critical insulation breakdown and other phenomena occur, which even lead to unstable grounding, seriously affecting measurement accuracy; there are additional effects such as mechanics and temperature, which affect the electrical and optical measurement structures, and the measurement theory is imperfect; under high electromagnetic pulse field strength, the sensor components may have nonlinear characteristics such as saturation, resulting in high-value pulse currents without traceability and no basis for fixed values; there are parameters such as distributed capacitance and inductance, and the measurement of pulse characteristics is distorted, which seriously restricts the measurement accuracy of large pulse currents. Due to the potential military application value of this technology, foreign countries have technical blockades in sensor components, measurement solutions, and traceability, and need to solve key measurement technologies on their own.

[0004] From the two aspects of measurement method research and calibration technology research, we carry out research on calibration methods of high-power and high-current parameter test systems, establish calibration devices, comprehensively ensure the accuracy and reliability of measurement values ​​in high-power and high-current application fields, and provide common basic technical support for the further development of high-power and high-current measurement technology in advanced energy fields. Summary of the invention

[0005] Based on the above technical deficiencies, the present invention proposes a test system and method for calibrating high-power and high-current parameters.

[0006] In a first aspect, the present application proposes a test system for calibrating high-power and high-current parameters, comprising: a high-power and high-current standard device, a standard current sensor, a high-speed data acquisition unit, and a central control machine;

[0007] The high-power and high-current standard device is used to provide high-power and high-current to the load to be tested;

[0008] The standard current sensor is used to collect the high current of the high-power and high-current standard device;

[0009] The high-speed data acquisition unit is used to calibrate the large current collected by the standard current sensor and transmit the calibrated data to the central control machine;

[0010] Central control machine, used to save calibrated data;

[0011] The high-power and high-current standard device comprises: a constant voltage charging unit, a pulse current generating circuit, a PLC control unit, and a measurement and data processing unit; the PLC control unit is respectively connected to the constant voltage charging unit, the pulse current generating circuit, and the measurement and data processing unit, the constant voltage charging unit is connected to the pulse current generating circuit, and the pulse current generating circuit is connected to the measurement and data processing unit;

[0012] The constant voltage charging unit is used to provide a charging voltage for the pulse current generating circuit;

[0013] The pulse current generating circuit is used to provide a pulse current for the load to be tested;

[0014] The PLC control unit is used to send control signals to the constant voltage charging unit, the pulse current generating circuit and the measurement and data processing unit respectively;

[0015] The measurement and data processing unit is used to collect and process high-power and high-current parameters of the load to be measured.

[0016] The pulse current generating circuit includes: an energy storage capacitor, a wave modulation device, a discharge switch and a load rack to be tested, wherein the energy storage capacitor is connected to the wave modulation device, the wave modulation period is connected to the discharge switch, and the discharge switch is connected to the capacitor circuit;

[0017] The energy storage capacitor includes a plurality of groups of capacitors, each group of capacitors is obtained by connecting two capacitors in series, and is used to store energy, and release the energy to the load through the wave modulation device, and generate a pulse current of a specified waveform during the energy release process;

[0018] The wave modulation device includes a wave modulation inductor, a wave modulation resistor and a short-circuit board, which is used to control the energy storage capacitor to release energy to the load;

[0019] The discharge switch is used to selectively connect different groups of capacitors to release energy to the load according to the specified waveform;

[0020] The load rack to be tested is used to place the current coil, standard current sensor and the sample to be calibrated.

[0021] The conduction condition of the discharge switch is: when the voltage across the energy storage capacitor is charged to a preset voltage value, the discharge switch is turned on; and the pulse current is determined by the modulation resistor and the modulation inductor.

[0022] The discharge switch is a mechanical discharge switch driven by a cylinder. After the mechanical discharge switch receives a discharge control signal sent by the PLC, the cylinder controls the closing or shutting down of the discharge switch.

[0023] The constant voltage charging unit comprises: a voltage regulator, a high voltage transformer and a voltage doubling charging capacitor, wherein the voltage regulator is connected to the high voltage transformer, the high voltage transformer is connected to the voltage doubling charging capacitor, and the voltage doubling charging capacitor is connected to the energy storage capacitor in the pulse current generating circuit;

[0024] The voltage regulator is used to adjust the output voltage of the high-voltage transformer by adjusting the output voltage of the voltage regulator, and is connected to the high-voltage end of the pulse transformer after rectification by a high-voltage diode and a current-limiting resistor;

[0025] The high-voltage transformer is used to provide a charging voltage;

[0026] The voltage-doubling charging capacitor is used to provide a voltage-doubling charging method. When the voltage across the energy storage capacitor is charged to a preset voltage value, the voltage-doubling charging capacitor is disconnected from the energy storage capacitor in the pulse current generating circuit.

[0027] The constant voltage charging unit has an automatic polarity conversion function and is composed of two high-voltage silicon stacks installed in opposite directions and a switching switch. The high-voltage silicon stack includes a forward silicon stack and a reverse silicon stack. When the switching switch behind the forward silicon stack is turned on, the energy storage capacitor is forward charged. When the switching switch behind the reverse silicon stack is turned on, the energy storage capacitor is reversely charged.

[0028] The PLC control unit includes: a charging control signal, a polarity conversion control signal, a grounding cylinder action signal and a discharge control signal.

[0029] The measurement and data processing unit includes: a pulse voltage divider, a current coil, a data acquisition unit, and a central control machine; the input end of the pulse voltage divider is connected to the input end of the energy storage capacitor, the input end of the current coil is connected to the output section of the main circuit frame in the pulse circuit generation loop, the output end of the pulse voltage divider and the output end of the current coil are respectively connected to the data acquisition unit, and the data acquisition unit is connected to the central control machine through a communication card;

[0030] The pulse voltage divider is used to receive the residual voltage of the load and send the residual voltage to the pulse voltage divider;

[0031] The current coil is used to receive the pulse current of the load and send the pulse current to the data acquisition unit;

[0032] The data acquisition unit is used to use the pulse current of the load and send the pulse current of the load to the central control machine;

[0033] The central control machine is used to process the pulse current of the load.

[0034] The test system for calibrating high-power and high-current parameters also includes: safety protection devices including: isolation network door switch, voltage regulator zero switch, comparator overvoltage protector, automatic grounding device;

[0035] The isolation network door switch is installed on the door of the test area where the test system for calibrating high-power and high-current parameters is located. When the isolation network door switch is not closed, the high-voltage transformer cannot be connected;

[0036] The voltage regulator zero position switch is installed on the voltage regulator in the constant voltage charging unit and is used to define the starting position of the voltage regulator motor;

[0037] The comparator overvoltage protector is connected to each group of capacitors, and is used to send out an alarm signal when the capacitor charging voltage is greater than a preset voltage, and disconnect the connection between the voltage-doubling charging capacitor and the capacitor to stop charging;

[0038] The automatic grounding device comprises a grounding resistor and a grounding cylinder, and is used to start the automatic grounding device when the capacitor releases energy to the load in an abnormal discharge state, so as to discharge the energy in the capacitor through the grounding resistor.

[0039] In a second aspect, the present application proposes a test method for calibrating high-power and high-current parameters, which is implemented by using the test system for calibrating high-power and high-current parameters described in the first aspect, including:

[0040] After the PLC control unit receives the test signal sent by the central control computer, the PLC control unit sends a charging control signal to the constant voltage charging unit;

[0041] After receiving the charging control signal, the constant voltage charging unit starts to charge the energy storage capacitor in the pulse current generating circuit;

[0042] When the charging voltage of the energy storage capacitor is greater than the preset voltage, the connection between the voltage doubling charging capacitor and the capacitor is manually disconnected, or the connection between the voltage doubling charging capacitor and the capacitor is disconnected through the comparator overvoltage protector to stop charging;

[0043] The PLC control unit sends a discharge control signal to the pulse current generating circuit;

[0044] After the pulse current generating circuit receives the discharge control signal, the discharge switch is turned on, and the energy storage capacitor releases energy to the load through the wave modulation device;

[0045] The measurement and data processing unit collects the residual voltage of the load through a pulse voltage divider, collects the pulse current through a current coil, and sends the residual voltage and pulse current of the load to the central control machine for data processing through the data acquisition unit.

[0046] Beneficial effects:

[0047] The present invention provides a test system and method for calibrating high-power and high-current parameters, which are used for high-power and high-current parameter test calibration, realize high-power and high-current parameter traceability, and ensure that the high-power and high-current parameter values ​​are accurate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A schematic diagram of a test system for calibrating high-power and high-current parameters according to an embodiment of the present application;

[0049] Figure 2 A test schematic diagram of a test system for calibrating high-power and high-current parameters according to an embodiment of the present application;

[0050] Figure 3 This is a flow chart of a test method for calibrating high-power and high-current parameters according to an embodiment of the present application. DETAILED DESCRIPTION

[0051] The specific implementation of the present application is further described in detail below in conjunction with the drawings and examples.

[0052] Embodiment 1:

[0053] This embodiment provides a test system for calibrating high power and high current parameters, such as Figure 1 , Figure 2 As shown, it includes: a high-power and high-current standard device, a standard current sensor, a high-speed data acquisition unit and a central control machine;

[0054] The high-power and high-current standard device is used to provide high-power and high-current to the load to be tested;

[0055] The standard current sensor is used to collect the high current of the high-power and high-current standard device;

[0056] The high-speed data acquisition unit is used to calibrate the large current collected by the standard current sensor and transmit the calibrated data to the central control machine;

[0057] Central control machine, used to save calibrated data;

[0058] The high-power and high-current standard device comprises: a constant voltage charging unit, a pulse current generating circuit, a PLC control unit, and a measurement and data processing unit; the PLC control unit is respectively connected to the constant voltage charging unit, the pulse current generating circuit, and the measurement and data processing unit, the constant voltage charging unit is connected to the pulse current generating circuit, and the pulse current generating circuit is connected to the measurement and data processing unit;

[0059] The constant voltage charging unit is used to provide a charging voltage for the pulse current generating circuit;

[0060] The pulse current generating circuit is used to provide a pulse current for the load to be tested;

[0061] The PLC control unit is used to send control signals to the constant voltage charging unit, the pulse current generating circuit and the measurement and data processing unit respectively;

[0062] The measurement and data processing unit is used to collect and process high-power and high-current parameters of the load to be measured.

[0063] In this embodiment, high power refers to power greater than MVA, and high current refers to current greater than 10kA. The high-power and high-current parameters are pulse currents. The high-speed data acquisition unit can share a data acquisition unit (four-channel oscilloscope) in the high-power and high-current standard device. The load to be measured includes: a current coil, a standard current sensor, and a sample to be calibrated.

[0064] In this embodiment, a test system for calibrating high-power and high-current parameters includes four parts: a constant voltage charging unit, a pulse current generating circuit, a PLC control unit, and a measurement and data processing unit.

[0065] (1) Constant voltage charging unit:

[0066] The constant voltage charging unit mainly provides the charging high voltage required for high-power and high-current parameter test calibration. The constant voltage charging unit includes: a voltage regulator, a high-voltage transformer and a voltage-doubling charging capacitor. The voltage regulator is connected to the high-voltage transformer, the high-voltage transformer is connected to the voltage-doubling charging capacitor, and the voltage-doubling charging capacitor is connected to the energy storage capacitor in the pulse current generating circuit;

[0067] The voltage regulator is used to adjust the output voltage of the high-voltage transformer by adjusting the output voltage of the voltage regulator, and is connected to the high-voltage end of the pulse transformer after rectification by a high-voltage diode and a current-limiting resistor;

[0068] The high-voltage transformer is used to provide a charging voltage;

[0069] The voltage-doubling charging capacitor is used to provide a voltage-doubling charging method. When the voltage across the energy storage capacitor is charged to a preset voltage value, the voltage-doubling charging capacitor is disconnected from the energy storage capacitor in the pulse current generating circuit.

[0070] The constant voltage charging unit has an automatic polarity conversion function and is composed of two high-voltage silicon stacks installed in opposite directions and a switching switch. The high-voltage silicon stack includes a forward silicon stack and a reverse silicon stack. When the switching switch behind the forward silicon stack is turned on, the energy storage capacitor is forward charged. When the switching switch behind the reverse silicon stack is turned on, the energy storage capacitor is reversely charged.

[0071] In this embodiment, there are a total of 4 groups of capacitors in the constant voltage charging unit, each group of capacitors is obtained by connecting two capacitors in series, and the withstand voltage is 100kV. The switch is a switch for selecting energy storage capacitors, and the switching of capacitors can be automatically switched according to different current waveforms. Working process of the main circuit When the voltage at both ends of the capacitor is charged to a preset voltage value, the controllable discharge switch is turned on, and the energy storage capacitor discharges to the load of the calibrated equipment through the wave modulation resistor and the inductor. Its output pulse current wave is determined by the wave modulation resistor and the wave modulation inductor. The discharge switch of the system is a mechanical switch. There is a voltage regulator in the constant voltage charging unit. During the calibration process, the output voltage of the high-voltage transformer can be adjusted by adjusting the output voltage of the voltage regulator. This voltage is connected to the high-voltage end of the pulse transformer after rectification by a high-voltage diode and a current limiting resistor, and then charges the capacitor. The constant voltage charging unit adopts a double voltage charging method for charging, and the charging process is stable; the charging voltage does not exceed 100kV, and the charging power is 15kVA. After the capacitor is charged, the high voltage is disconnected, and the charging network is automatically disconnected from the energy storage capacitor, which can avoid the reverse impact on the charging network after the waveform oscillation. The constant voltage charging unit has an automatic polarity conversion function. It consists of two high-voltage silicon stacks installed in opposite directions and a switching switch. The silicon stack is actually a high-voltage diode. Its function is to perform half-wave rectification on the alternating current. During the charging process, if the switching switch behind the forward silicon stack is turned on, the pulse capacitor will be charged with positive electricity, and vice versa.

[0072] (2) Pulse current generating circuit:

[0073] The pulse current generating circuit mainly provides the high-power and high-current required for the high-power and high-current parameter test and calibration. The pulse current generating circuit includes: an energy storage capacitor, a wave modulation device, a discharge switch and a load rack to be tested. The energy storage capacitor is connected to the wave modulation device, and the wave modulation period is connected to the discharge switch, and the discharge switch is connected to the capacitor circuit;

[0074] The energy storage capacitor includes a plurality of groups of capacitors, each group of capacitors is obtained by connecting two capacitors in series, and is used to store energy, and release the energy to the load through the wave modulation device, and generate a pulse current of a specified waveform during the energy release process;

[0075] The wave modulation device includes a wave modulation resistor, a wave modulation inductor and a short-circuit board, which is used to control the energy storage capacitor to release energy to the load;

[0076] The discharge switch is used to selectively connect different groups of capacitors to release energy to the load according to the specified waveform;

[0077] The load rack to be tested is used to place the current coil, standard current sensor and the sample to be calibrated.

[0078] The conduction condition of the discharge switch is: when the voltage across the energy storage capacitor is charged to a preset voltage value, the discharge switch is turned on; and the pulse current is determined by the modulation resistor and the modulation inductor.

[0079] In this embodiment, a PLC is used to determine whether the voltage across the energy storage capacitor is charged to a preset voltage value.

[0080] The discharge switch is a mechanical discharge switch driven by a cylinder. After the mechanical discharge switch receives a discharge control signal sent by the PLC, the cylinder controls the closing or shutting down of the discharge switch.

[0081] It can be understood that the mechanical discharge switch has the advantages of simple structure, easy operation and reliable performance. It is mainly used for action load calibration in the "asynchronous" mode. After receiving the signal, the mechanical discharge switch is controlled to shut down by the cylinder.

[0082] (3)PLC control unit:

[0083] The PLC control unit mainly realizes the software and hardware control of the high-power and high-current standard device. The PLC control unit includes: a charging control signal, a polarity conversion control signal, a grounding cylinder action signal and a discharge control signal.

[0084] In this embodiment, the input status signals of the PLC control unit mainly include control signals such as emergency stop signal, voltage comparison trigger signal, test door switch signal, etc.; the output status of the PLC mainly includes the charging control signal of the charging source, polarity conversion control signal, grounding cylinder action signal and discharge control signal, etc.; in addition to outputting input signals, the PLC control part also needs to monitor signals such as charging voltage, and at this time, an A / D conversion module is used to send these signals to the PLC.

[0085] (4) Measurement and data processing unit:

[0086] The measurement and data processing unit mainly realizes data collection and data processing of high power and large current. The measurement and data processing unit includes: a pulse voltage divider, a current coil, a data collection unit, and a central control machine; the input end of the pulse voltage divider is connected to the input end of the energy storage capacitor, the input end of the current coil is connected to the output section of the main circuit frame in the pulse circuit generation loop, the output end of the pulse voltage divider and the output end of the current coil are respectively connected to the data collection unit, and the data collection unit is connected to the central control machine through a communication card;

[0087] The pulse voltage divider is used to receive the residual voltage of the load and send the residual voltage to the pulse voltage divider;

[0088] The current coil is used to receive the pulse current of the load and send the pulse current to the data acquisition unit;

[0089] The data acquisition unit is used to use the pulse current of the load and send the pulse current of the load to the central control machine;

[0090] The central control machine is used to process the pulse current of the load.

[0091] In this embodiment, the central control machine is used as the human-machine interface, and the central control machine communicates with the PLC part through the serial port. In order to maximize the safety of operators and equipment in the standard device, the central control machine and the PLC are isolated by optical fiber when communicating. The control and measurement functions are realized simultaneously using a central control machine, and the central control machine communicates with the data acquisition unit wirelessly. The network port of the data acquisition unit is connected to a wireless router through an RJ45 network cable to form a small wireless LAN. The central control machine is connected to the LAN through a wireless network card, and then the waveform on the data acquisition unit is collected through software.

[0092] The test system for calibrating high-power and high-current parameters also includes: safety protection devices including: isolation network door switch, voltage regulator zero switch, comparator overvoltage protector, automatic grounding device;

[0093] The isolation network door switch is installed on the door of the test area where the test system for calibrating high-power and high-current parameters is located. When the isolation network door switch is not closed, the high-voltage transformer cannot be connected;

[0094] The voltage regulator zero position switch is installed on the voltage regulator in the constant voltage charging unit and is used to define the starting position of the voltage regulator motor;

[0095] In this embodiment, the AC220V power supply passes through the AC contactor and is connected to the input end of the voltage regulator. The voltage regulator is an autotransformer. The brush is driven by a motor to move on the voltage regulator coil. The output voltage varies between 0 and 250V. The output voltage of the voltage regulator is connected to the input end of the step-up transformer, and the transformer outputs the voltage after proportional step-up.

[0096] The comparator overvoltage protector is connected to each group of capacitors, and is used to send out an alarm signal when the capacitor charging voltage is greater than a preset voltage, and disconnect the connection between the voltage-doubling charging capacitor and the capacitor to stop charging;

[0097] The automatic grounding device includes a grounding resistor and a grounding cylinder, which is used to start the automatic grounding device when the capacitor releases energy to the load in an abnormal discharge state, and discharge the energy in the capacitor through the grounding resistor. In this embodiment, the central control machine software determines whether the discharge is abnormal.

[0098] In this embodiment, the high-power and high-current standard device is a high-voltage and high-current device, which must have complete and reliable safety protection measures. The safety protection measures are as follows:

[0099] (a) Isolation network door switch

[0100] The isolation net door switch is installed on the door of the test area. When the isolation net door switch is not closed, the high voltage cannot be connected and the charging process of the generator cannot be carried out. The isolation net door switch effectively ensures that there will be no high voltage in the test area when the test personnel are in the test area, thereby ensuring the personal safety of the test personnel.

[0101] (b) Voltage regulator zero switch

[0102] The zero position switch is installed on the voltage regulator of the charging circuit to limit the start of the charging process of the impact test, which is actually to limit the starting position of the voltage regulator motor to ensure that the first voltage boost process of manual and automatic experiments must start from zero. In actual use, press the "voltage drop" switch and the voltage regulator will automatically return to zero.

[0103] (c) Comparator overvoltage protector

[0104] The control circuit is equipped with overvoltage protection. The working principle is that if the charging voltage on the capacitor is greater than a certain range of the preset discharge voltage, the overvoltage protection mechanism will work and send out an "alarm" signal, the high voltage will be disconnected, and the charging process will stop. The overvoltage protection mechanism of the device avoids the "overcharge" phenomenon of the charging voltage.

[0105] (d) Automatic grounding device

[0106] The automatic grounding protection mechanism is composed of a grounding resistor and a grounding cylinder. When the device cannot discharge normally for some reason, press the "emergency stop" button on the main control panel, the control circuit power supply is disconnected, and the automatic grounding device is grounded. The charge stored on the capacitor will be discharged through the grounding resistor, ensuring the safe operation of the high-voltage test. When the equipment is powered off and the door switch, rack switch, etc. mentioned above are not closed, the grounding cylinder will also act to ground the high-voltage end of the capacitor.

[0107] Embodiment 2:

[0108] This embodiment proposes a test method for calibrating high-power and high-current parameters, which is implemented using the test system for calibrating high-power and high-current parameters described in Embodiment 1. Figure 3 As shown, including:

[0109] Step S1: After the PLC control unit receives the test signal sent by the central control machine, the PLC control unit sends a charging control signal to the constant voltage charging unit;

[0110] Step S2: After receiving the charging control signal, the constant voltage charging unit starts to charge the energy storage capacitor in the pulse current generating circuit;

[0111] Step S3: When the charging voltage of the energy storage capacitor is greater than the preset voltage, the connection between the voltage doubling charging capacitor and the capacitor is manually disconnected, or the connection between the voltage doubling charging capacitor and the capacitor is disconnected by the comparator overvoltage protector to stop charging;

[0112] Step S4: the PLC control unit sends a discharge control signal to the pulse current generating circuit;

[0113] Step S5: After the pulse current generating circuit receives the discharge control signal, the discharge switch is turned on, and the energy storage capacitor releases energy to the load through the wave modulation device;

[0114] Step S6: The measurement and data processing unit collects the residual voltage of the load through the pulse voltage divider, collects the pulse current through the current coil, and sends the residual voltage and pulse current of the load to the central control machine for data processing through the data acquisition unit.

[0115] In this embodiment, the test calibration is first performed by the central control machine sending a test calibration signal to the PLC control unit. After the PLC control unit detects the test calibration signal, it first charges the energy storage capacitor group through the constant voltage charging unit. When the voltage on the capacitor reaches a preset value, the high voltage is manually disconnected to stop charging, or the voltage comparison unit sends a charging stop signal to the PLC in automatic mode. Then the PLC controls the discharge switch (cylinder discharge ball) to turn on, and the capacitor releases the stored energy to the load through the wave modulation device, generating a pulse current of a specified waveform. The pulse current and the residual voltage of the device under test are transmitted to the data acquisition unit through the current coil, the pulse voltage divider, the standard current sensor, and the sample to be calibrated. The data acquisition unit transmits the data to the central control machine through the wireless communication system for data analysis and processing. The pulse current value measured on the current coil is used as the current setting value of the high-power large-current standard device, the pulse current measured on the standard current sensor is used as the standard value, and the pulse current value measured on the device to be calibrated is used as the display value.

[0116] The various embodiments in the present application are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0117] The protection scope of the present application is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the scope and spirit of the present disclosure. If these changes and modifications fall within the scope of the claims of the present disclosure and their equivalents, the intention of the present disclosure also includes these changes and modifications.

Claims

1. A test system for calibrating high power and high current parameters, characterized in that: The test system for calibrating high-power and high-current parameters comprises: a high-power and high-current standard device, a standard current sensor, a high-speed data acquisition unit and a central control machine; The high-power and high-current standard device is used to provide high-power and high-current to the load to be tested; The standard current sensor is used to collect the high current of the high-power and high-current standard device; The high-speed data acquisition unit is used to calibrate the large current collected by the standard current sensor and transmit the calibrated data to the central control machine; Central control machine, used to save calibrated data; The high-power and high-current standard device comprises: a constant voltage charging unit, a pulse current generating circuit, a PLC control unit, and a measurement and data processing unit; the PLC control unit is respectively connected to the constant voltage charging unit, the pulse current generating circuit, and the measurement and data processing unit, the constant voltage charging unit is connected to the pulse current generating circuit, and the pulse current generating circuit is connected to the measurement and data processing unit; The constant voltage charging unit is used to provide a charging voltage for the pulse current generating circuit; The pulse current generating circuit is used to provide a pulse current for the load to be tested; The PLC control unit is used to send control signals to the constant voltage charging unit, the pulse current generating circuit and the measurement and data processing unit respectively; The measurement and data processing unit is used to collect and process high-power and high-current parameters of the load to be measured.

2. The test system for calibrating high power and high current parameters according to claim 1, characterized in that: The pulse current generating circuit includes: an energy storage capacitor, a wave modulation device, a discharge switch and a load rack to be tested, wherein the energy storage capacitor is connected to the wave modulation device, the wave modulation period is connected to the discharge switch, and the discharge switch is connected to the capacitor circuit; The energy storage capacitor includes a plurality of groups of capacitors, each group of capacitors is obtained by connecting two capacitors in series, and is used to store energy, and release the energy to the load through the wave modulation device, and generate a pulse current of a specified waveform during the energy release process; The wave modulation device includes a wave modulation inductor, a wave modulation resistor and a short-circuit board, which is used to control the energy storage capacitor to release energy to the load; The discharge switch is used to selectively connect different groups of capacitors to release energy to the load according to the specified waveform; The load rack to be tested is used to place the current coil, standard current sensor and the sample to be calibrated.

3. The test system for calibrating high power and high current parameters according to claim 2, characterized in that: The conduction condition of the discharge switch is: when the voltage across the energy storage capacitor is charged to a preset voltage value, the discharge switch is turned on; and the pulse current is determined by the modulation resistor and the modulation inductor.

4. The test system for calibrating high power and high current parameters according to claim 2, characterized in that: The discharge switch is a mechanical discharge switch driven by a cylinder. After the mechanical discharge switch receives a discharge control signal sent by the PLC, the cylinder controls the closing or shutting down of the discharge switch.

5. The test system for calibrating high power and high current parameters according to claim 1, characterized in that: The constant voltage charging unit comprises: a voltage regulator, a high voltage transformer and a voltage doubling charging capacitor, wherein the voltage regulator is connected to the high voltage transformer, the high voltage transformer is connected to the voltage doubling charging capacitor, and the voltage doubling charging capacitor is connected to the energy storage capacitor in the pulse current generating circuit; The voltage regulator is used to adjust the output voltage of the high-voltage transformer by adjusting the output voltage of the voltage regulator, and is connected to the high-voltage end of the pulse transformer after rectification by a high-voltage diode and a current-limiting resistor; The high-voltage transformer is used to provide a charging voltage; The voltage-doubling charging capacitor is used to provide a voltage-doubling charging method. When the voltage across the energy storage capacitor is charged to a preset voltage value, the voltage-doubling charging capacitor is disconnected from the energy storage capacitor in the pulse current generating circuit.

6. The test system for calibrating high power and high current parameters according to claim 5, characterized in that: The constant voltage charging unit has an automatic polarity conversion function and is composed of two high-voltage silicon stacks installed in opposite directions and a switching switch. The high-voltage silicon stack includes a forward silicon stack and a reverse silicon stack. When the switching switch behind the forward silicon stack is turned on, the energy storage capacitor is forward charged. When the switching switch behind the reverse silicon stack is turned on, the energy storage capacitor is reversely charged.

7. The test system for calibrating high-power and high-current parameters according to claim 1, characterized in that: The PLC control unit includes: a charging control signal, a polarity conversion control signal, a grounding cylinder action signal and a discharge control signal.

8. The test system for calibrating high-power and high-current parameters according to claim 1, characterized in that: The measurement and data processing unit includes: a pulse voltage divider, a current coil, a data acquisition unit, and a central control machine; the input end of the pulse voltage divider is connected to the input end of the energy storage capacitor, the input end of the current coil is connected to the output section of the main circuit frame in the pulse circuit generation loop, the output end of the pulse voltage divider and the output end of the current coil are respectively connected to the data acquisition unit, and the data acquisition unit is connected to the central control machine through a communication card; The pulse voltage divider is used to receive the residual voltage of the load and send the residual voltage to the pulse voltage divider; The current coil is used to receive the pulse current of the load and send the pulse current to the data acquisition unit; The data acquisition unit is used to use the pulse current of the load and send the pulse current of the load to the central control machine; The central control machine is used to process the pulse current of the load.

9. The test system for calibrating high power and high current parameters according to claim 1, characterized in that: The test system for calibrating high-power and high-current parameters also includes: safety protection devices including: isolation network door switch, voltage regulator zero switch, comparator overvoltage protector, automatic grounding device; The isolation network door switch is installed on the door of the test area where the test system for calibrating high-power and high-current parameters is located. When the isolation network door switch is not closed, the high-voltage transformer cannot be connected; The voltage regulator zero position switch is installed on the voltage regulator in the constant voltage charging unit and is used to define the starting position of the voltage regulator motor; The comparator overvoltage protector is connected to each group of capacitors and is respectively connected to multiple groups of capacitors. When the charging voltage of the capacitor is greater than a preset voltage, the comparator overvoltage protector sends an alarm signal and disconnects the connection between the voltage-doubling charging capacitor and the capacitor to stop charging. The automatic grounding device comprises a grounding resistor and a grounding cylinder, and is used to start the automatic grounding device when the capacitor releases energy to the load in an abnormal discharge state, so as to discharge the energy in the capacitor through the grounding resistor.

10. A test method for calibrating high power and high current parameters, implemented by using the test system for calibrating high power and high current parameters according to any one of claims 1 to 9, characterized in that: include: After the PLC control unit receives the test signal sent by the central control computer, the PLC control unit sends a charging control signal to the constant voltage charging unit; After receiving the charging control signal, the constant voltage charging unit starts to charge the energy storage capacitor in the pulse current generating circuit; When the charging voltage of the energy storage capacitor is greater than the preset voltage, the connection between the voltage doubling charging capacitor and the capacitor is manually disconnected, or the connection between the voltage doubling charging capacitor and the capacitor is disconnected through the comparator overvoltage protector to stop charging; The PLC control unit sends a discharge control signal to the pulse current generating circuit; After the pulse current generating circuit receives the discharge control signal, the discharge switch is turned on, and the energy storage capacitor releases energy to the load through the wave modulation device; The measurement and data processing unit collects the residual voltage of the load through a pulse voltage divider, collects the pulse current through a current coil, and sends the residual voltage and pulse current of the load to the central control machine for data processing through the data acquisition unit.

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