CN110749848A - Current parameter calibration system and method based on current channel switching instrument - Google Patents
Current parameter calibration system and method based on current channel switching instrument Download PDFInfo
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- CN110749848A CN110749848A CN201910911812.4A CN201910911812A CN110749848A CN 110749848 A CN110749848 A CN 110749848A CN 201910911812 A CN201910911812 A CN 201910911812A CN 110749848 A CN110749848 A CN 110749848A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to a current parameter calibration system, in particular to a current parameter calibration system and method based on a current channel switching instrument, which realizes the calibration of special-purpose equipment. The calibration system comprises a current channel switching instrument, an oscilloscope, a GPIB controller, a program control power supply and a computer; the current channel switching instrument comprises a power supply filtering module, a switching power supply, a processor system, n relays, n groups of power resistors connected in parallel and a sampling resistor; the input ends of n groups of parallel power resistors are respectively connected with the signal input positive end through each relay, the output ends of the n groups of parallel resistors are connected with one end of a sampling resistor, and the other end of the sampling resistor is connected with the signal input negative end to form a closed loop; two ends of the sampling resistor are led out to be used as signal output ends; the voltage on the sampling resistor is collected through the oscilloscope, and a current curve is obtained through calculation, so that the calibration of the current parameters of special test equipment of a certain model is realized. Simple structure, feasibility and effectiveness, and has popularization value.
Description
Technical Field
The invention relates to a current parameter calibration system, in particular to a current parameter calibration system and method based on a current channel switching instrument.
Background
With the development of missile and carrier rocket technology, the requirements on lightening, quick response and high reliability of an electromagnetic valve for controlling the opening and closing of an engine are more and more outstanding. The bullet/arrow power system realizes multiple times of starting of the engine by means of multiple times of opening and closing of the electromagnetic valve, and the success or failure and performance level of the engine work are determined by the reliability and performance of the electromagnetic valve. The electromagnetic valve is extremely important in engines started for multiple times, particularly in attitude control engines, and repeated starting and pulse operation of the engine are realized just by adopting the electromagnetic valve. In order to ensure the reliability and performance of the electromagnetic valve, the steady-state current parameters of the electromagnetic valve need to be measured, the steady-state current parameters can be measured by using a satellite propulsion subsystem universal unit test device (for short, a special test device) developed by some research institute in the Shanghai, and the steady-state current parameters of the electromagnetic valve need to be calibrated before the device is used for measuring the steady-state current parameters of the electromagnetic valve.
However, since the current measuring module of the special-purpose equipment adopts the MOS transistor, the special-purpose equipment is damaged if a direct calibration method is adopted, and therefore, the calibration cannot be performed by adopting the direct calibration method.
Disclosure of Invention
In order to realize the calibration of the special test equipment, the invention provides a current parameter calibration system and method based on a current channel switching instrument.
The technical scheme of the invention is to provide a current parameter calibration system based on a current channel switching instrument, which is characterized in that: the device comprises a current channel switching instrument, an oscilloscope, a GPIB controller, a program control power supply and a computer;
the current channel switching instrument comprises a power supply filtering module, a switching power supply, a processor system, n relays, n groups of power resistors connected in parallel and a sampling resistor; the power supply filtering module and the switch power supply are used for supplying power to the processor system and the n relays; the processor system is communicated with the computer and is used for receiving a control instruction sent by the computer and controlling the on-off of each relay; the input ends of the n groups of parallel power resistors are respectively connected with the signal input positive end through each relay, the output ends of the n groups of parallel resistors are connected with one end of the sampling resistor, and the other end of the sampling resistor is connected with the signal input negative end to form a closed loop; two ends of the sampling resistor are led out to be used as signal output ends; n is a positive integer greater than or equal to 1;
the computer is respectively communicated with the program control power supply and the oscilloscope through the GPIB controller;
the program-controlled power supply is used for providing a 28V power supply for special equipment; the special-purpose equipment is connected with the signal input end of the current channel switching instrument through a calibration cable;
the oscilloscope is connected with the signal output end of the current channel switching instrument and is used for acquiring voltage waveforms at two ends of a sampling resistor in the current channel switching instrument;
the computer comprises a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the following steps are realized:
step one, initialization
Sending an instruction to control the oscilloscope to initialize; sending an instruction to control the programmable power supply to output the required voltage;
step two, data acquisition
Step 2.1, sending a control instruction to a processor system in the current channel switching instrument, controlling the on-off of a target relay, and accessing a power resistor corresponding to a target point;
step 2.2, controlling an oscilloscope to collect voltage values at two ends of a sampling resistor in the current channel switching instrument to obtain and store a voltage curve corresponding to a corresponding target point;
step 2.3, judging whether the access of all the target point power resistors is finished, if so, executing the step three, otherwise, repeating the step 2.1 to the step 2.2 until the access of all the target point power resistors is finished; different target points correspond to different power resistors;
step three, data processing
3.1, calling a data processing program, processing the obtained voltage curve, and calculating according to ohm's law to obtain a current curve corresponding to each target point; analyzing according to the current curve to obtain time information and a steady state value of the measured current;
and 3.2, performing least square fitting by using the steady-state values of the measured currents of all the target points and the known k and b coefficients to obtain fitting values, comparing the fitting values with the standard values to obtain the corrected values of all the target points, and calibrating all the target points.
Further, in order to improve the measurement accuracy, the current channel switching instrument further comprises a cooling device, wherein the cooling device is used for cooling the power resistor, so that the power resistor is ensured to dissipate heat in time.
Further, the cooling device is a fan.
Further, the calibration cable is a 62-core dedicated calibration cable.
The invention also provides a current parameter calibration method based on the current channel switching instrument, which comprises the following steps:
step one, initialization
Sending an instruction to control the oscilloscope to initialize; sending an instruction to control the programmable power supply to output the required voltage;
step two, data acquisition
Step 2.1, sending a control instruction to a processor system in the current channel switching instrument, controlling the on-off of a target relay, and accessing a power resistor corresponding to a target point;
step 2.2, controlling an oscilloscope to collect voltage values at two ends of a sampling resistor in the current channel switching instrument to obtain and store a voltage curve corresponding to a corresponding target point;
step 2.3, judging whether the access of all the target point power resistors is finished, if so, executing the step three, otherwise, repeating the step 2.1 to the step 2.2 until the access of all the target point power resistors is finished; different target points correspond to different power resistors;
step three, data processing
Step 3.1, processing the obtained voltage curve, and calculating according to ohm's law to obtain a current curve corresponding to each target point; analyzing according to the current curve to obtain time information and a steady state value of the measured current;
and 3.2, performing least square fitting by using the steady-state values of the measured currents of all the target points and the known k and b coefficients to obtain fitting values, comparing the fitting values with the standard values to obtain the corrected values of all the target points, and calibrating all the target points.
The invention has the beneficial effects that:
1. based on ohm's law, n groups of power resistors are arranged in a current channel switching instrument, the power resistors are connected with sampling resistors in series, voltages on the sampling resistors are collected through an oscilloscope, a current curve is obtained through calculation, and the current parameters of special test equipment of a certain model are calibrated; the current parameter calibration device has the advantages of simple, feasible and effective structure, capability of realizing current parameter calibration only by providing a current channel switching instrument, an oscilloscope, a GPIB controller, a program control power supply, a special calibration cable and a computer, and popularization value.
2. According to the number of n calibration points, n power resistors connected in parallel are arranged in the current channel switching instrument, a current curve corresponding to one calibration point can be obtained every time one power resistor is connected, a measured current steady-state value is obtained according to the current curve, n measured current steady-state values are obtained in total, multi-point calibration is achieved, and the accuracy of the finally obtained correction value is high.
3. The power resistor is cooled by the cooling device, so that the power resistor is ensured to dissipate heat in time, the temperature drift of the sampling resistor is small, and the measurement precision is high;
drawings
FIG. 1 is a block diagram of a current parameter calibration system based on a current channel switching instrument according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of a current channel switching instrument in an embodiment of the present invention.
Detailed Description
The following describes in detail the embodiments of the present invention, such as the components, the mutual positions and connection relationships between the respective parts, the functions and operation principles of the respective parts, with reference to the drawings and the embodiments.
As can be seen from fig. 1, the current parameter calibration system based on the current channel switching instrument in this embodiment mainly includes the current channel switching instrument, an oscilloscope, a GPIB controller, a program-controlled power supply, a dedicated calibration cable, and a computer. The GPIB controller is used for controlling the communication between the computer and the program control power supply and the oscilloscope; the computer is used for sending a control instruction to the program-controlled power supply, the oscilloscope and the current channel switching instrument; the programmable power supply is used for providing a 28V power supply; the special calibration cable is used for connecting the special test equipment and the signal input end of the current channel switching instrument; the oscilloscope is connected with the signal output end of the current channel switching instrument.
As can be seen from fig. 2, the current channel switching instrument of this embodiment mainly includes a 220V power supply filtering module, a switching power supply, a processor system, a sampling resistor, a relay, a power resistor, a signal input terminal, and a signal output terminal. The 220V power supply filtering module realizes the filtering processing of 220V alternating current so as to stabilize the voltage; the switching power supply realizes power supply to the processor system and the relay; the processor system is communicated with each relay, and the on-off of each relay is controlled according to the instruction of the computer. In the embodiment, 3 sets of relays and 3 sets of power resistors are adopted, wherein the power resistors are respectively R1, R2 and R3, and the relays are respectively J1, J2 and J3. The 3 groups of power resistors are connected in parallel, the input end of each power resistor is connected with the positive end of the signal input through a relay, and the output ends of the 3 groups of power resistors are connected with the negative end of the signal input after being connected with the sampling resistor in series. Two ends of the sampling resistor are respectively connected with the positive end and the negative end of the signal output to be used as the signal output end. Referring to fig. 1, the oscilloscope is connected to the signal output terminal of the current channel switching instrument, and is configured to collect voltage waveforms at both ends of the sampling resistor.
The computer comprises a storage and a processor, wherein a computer program is stored in the storage, and when the computer program is executed in the processor, the following processes can be realized:
firstly, sending an instruction to control the oscilloscope to initialize, sending the instruction to control the programmable power supply to output required voltage, and forming a loop by the programmable power supply, special test equipment and a current channel switching instrument;
then, controlling the on-off of the relay, accessing power resistors corresponding to different target points, controlling the oscilloscope to collect voltage values on sampling resistors in the current channel switcher, obtaining voltage values corresponding to the different target points, and storing the voltage values;
then, step 2.3, judging whether the access of all the target point power resistors is finished, if so, executing step three, otherwise, repeating the steps 2.1 to 2.2 until the access of all the target point power resistors is finished; different target points correspond to different power resistors;
step three, data processing
Step 3.1, processing the obtained voltage curve, and calculating according to ohm's law to obtain a current curve corresponding to each target point; analyzing according to the current curve to obtain time information and a steady state value of the measured current;
and 3.2, performing least square fitting by using the steady-state values of the measured currents of all the target points and the known k and b coefficients to obtain fitting values, comparing the fitting values with the standard values to obtain the corrected values of all the target points, and calibrating all the target points.
For the embodiment, the specific working process is as follows:
when the device works, a computer sends a control command to a processor system of a current channel switching instrument to control a relay J1 to be closed, a 28V power supply is applied to a signal input end, the relay J1, a power resistor R1 and a sampling resistor R4 are connected to a signal output end, sampling is carried out by an oscilloscope, voltage values at two ends of the sampling resistor are obtained, a current curve (the abscissa of the current curve is time, and the ordinate of the current curve is a current value) is obtained through calculation according to ohm's law, and a measured current value is obtained through processing according to upper computer software; processing to obtain a first measured current steady-state value; and according to the known k and b, fitting to obtain a first fitting value, comparing the first fitting value with a standard value to obtain a corrected value, and realizing first point calibration.
The computer sends a control command to a processor system of the current channel switching instrument to control a relay J2 to be closed, a 28V power supply is applied to a signal input end, the relay J2, a power resistor R2 and a sampling resistor R4 are connected to a signal output end, sampling is carried out by an oscilloscope, voltage values at two ends of the sampling resistor are obtained, a current curve (the abscissa of the current curve is time, and the ordinate of the current curve is a current value) is obtained through calculation according to an ohm law, and a measured current value is obtained through processing according to upper computer software; processing to obtain a second steady state value of the measured current; and according to the known k and b, fitting to obtain a second fitting value, comparing the second fitting value with the standard value to obtain a corrected value, and realizing second point calibration.
The computer sends a control command to a processor system of the current channel switching instrument to control a relay J3 to be closed, a 28V power supply is applied to a signal input end, the relay J3, a power resistor R3 and a sampling resistor R4 are connected to a signal output end, sampling is carried out by an oscilloscope, voltage values at two ends of the sampling resistor are obtained, a current curve (the abscissa of the current curve is time, and the ordinate of the current curve is a current value) is obtained through calculation according to an ohm law, and a measured current value is obtained through processing according to upper computer software; processing to obtain a third steady-state value of the measured current; and according to the known k and b, fitting to obtain a third fitting value, comparing the third fitting value with the standard value to obtain a corrected value, and realizing third-point calibration.
Claims (5)
1. The utility model provides a current parameter calibration system based on current channel switches appearance which characterized in that: the device comprises a current channel switching instrument, an oscilloscope, a GPIB controller, a program control power supply and a computer;
the current channel switching instrument comprises a power supply filtering module, a switching power supply, a processor system, n relays, n groups of power resistors connected in parallel and a sampling resistor; the power supply filtering module and the switch power supply are used for supplying power to the processor system and the n relays; the processor system is communicated with the computer and is used for receiving a control instruction sent by the computer and controlling the on-off of each relay; the input ends of the n groups of parallel power resistors are respectively connected with the signal input positive end through each relay, the output ends of the n groups of parallel resistors are connected with one end of the sampling resistor, and the other end of the sampling resistor is connected with the signal input negative end to form a closed loop; two ends of the sampling resistor are led out to be used as signal output ends; n is a positive integer greater than or equal to 1;
the computer is respectively communicated with the program control power supply and the oscilloscope through the GPIB controller;
the program-controlled power supply is used for providing a 28V power supply for special equipment; the special-purpose equipment is connected with the signal input end of the current channel switching instrument through a calibration cable;
the oscilloscope is connected with the signal output end of the current channel switching instrument and is used for acquiring voltage waveforms at two ends of a sampling resistor in the current channel switching instrument;
the computer comprises a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the following steps are realized:
step one, initialization
Sending an instruction to control the oscilloscope to initialize; sending an instruction to control the programmable power supply to output the required voltage;
step two, data acquisition
Step 2.1, sending a control instruction to a processor system in the current channel switching instrument, controlling the on-off of a target relay, and accessing a power resistor corresponding to a target point;
step 2.2, controlling an oscilloscope to collect voltage values at two ends of a sampling resistor in the current channel switching instrument to obtain and store a voltage curve corresponding to a corresponding target point;
step 2.3, judging whether the access of all the target point power resistors is finished, if so, executing the step three, otherwise, repeating the step 2.1 to the step 2.2 until the access of all the target point power resistors is finished; different target points correspond to different power resistors;
step three, data processing
3.1, calling a data processing program, processing the obtained voltage curve, and calculating according to ohm's law to obtain a current curve corresponding to each target point; analyzing according to the current curve to obtain time information and a steady state value of the measured current;
and 3.2, performing least square fitting by using the steady-state values of the measured currents of all the target points and the known k and b coefficients to obtain fitting values, and comparing the fitting values with the standard values to obtain the correction values of all the target points so as to realize the calibration of all the target points.
2. The current channel switch meter based current parameter calibration system of claim 1, wherein: the current channel switching instrument further comprises a cooling device, and the cooling device is used for cooling the power resistor.
3. The current channel switch meter based current parameter calibration system of claim 2, wherein: the cooling equipment is a fan.
4. The current channel switch meter based current parameter calibration system of claim 3, wherein: the calibration cable is a 62-core special calibration cable.
5. A current parameter calibration method based on a current channel switching instrument is characterized by comprising the following steps:
step one, initialization
Sending an instruction to control the oscilloscope to initialize; sending an instruction to control the programmable power supply to output the required voltage;
step two, data acquisition
Step 2.1, sending a control instruction to a processor system in the current channel switching instrument, controlling the on-off of a target relay, and accessing a power resistor corresponding to a target point;
step 2.2, controlling an oscilloscope to collect voltage values at two ends of a sampling resistor in the current channel switching instrument to obtain and store a voltage curve corresponding to a corresponding target point;
step 2.3, judging whether the access of all the target point power resistors is finished, if so, executing the step three, otherwise, repeating the step 2.1 to the step 2.2 until the access of all the target point power resistors is finished; different target points correspond to different power resistors;
step three, data processing
Step 3.1, processing the obtained voltage curve, and calculating according to ohm's law to obtain a current curve corresponding to each target point; analyzing according to the current curve to obtain time information and a steady state value of the measured current;
and 3.2, performing least square fitting by using the steady-state values of the measured currents of all the target points and the known k and b coefficients to obtain fitting values, comparing the fitting values with the standard values to obtain the corrected values of all the target points, and calibrating all the target points.
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| CN111766431A (en) * | 2020-06-11 | 2020-10-13 | 积成电子股份有限公司 | Alternating current voltage and current multiplexing acquisition method and system free of secondary calibration |
| CN113406550A (en) * | 2021-07-29 | 2021-09-17 | 深圳国人无线通信有限公司 | Current detection calibration method and system |
| CN113872645A (en) * | 2021-11-18 | 2021-12-31 | 上海创远仪器技术股份有限公司 | Method, apparatus, processor and computer readable storage medium for implementing reciprocity calibration of MIMO channel simulator |
| CN114859798A (en) * | 2022-07-06 | 2022-08-05 | 广东舜势测控设备有限公司 | Control circuit, control method thereof, controller, and computer-readable storage medium |
| CN114924109A (en) * | 2022-07-20 | 2022-08-19 | 深圳市英特瑞半导体科技有限公司 | Method, circuit and device for testing low-power chip current |
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Application publication date: 20200204 |