CN114252798A - Large-current pulse power supply output calibration method and device and electronic equipment - Google Patents
Large-current pulse power supply output calibration method and device and electronic equipment Download PDFInfo
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- CN114252798A CN114252798A CN202111532994.8A CN202111532994A CN114252798A CN 114252798 A CN114252798 A CN 114252798A CN 202111532994 A CN202111532994 A CN 202111532994A CN 114252798 A CN114252798 A CN 114252798A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The application provides a method, a device and electronic equipment for calibrating output of a high-current pulse power supply, wherein the method is applied to ATE (automatic test equipment) provided with a universal meter, a voltage and current source and a load; the load is connected with a voltage measuring unit and a current measuring unit; determining a target resistance in a load according to a voltage gear to be calibrated and a large current gear to be calibrated, controlling a multimeter to measure the resistance value of the target resistance, and calibrating a voltage measuring unit based on the voltage gear to be calibrated; switching a voltage current source to a high-current gear to be calibrated; the gears correspond to a plurality of calibration point current values; determining actual current values and measured current values respectively corresponding to the voltage current source outputting a plurality of calibration point current values based on the current measuring unit, the calibrated voltage measuring unit and the resistance value; and calculating a calibration coefficient corresponding to the large-current gear to be calibrated. The method is simple to implement and low in cost, can traverse the whole large-current gear range, can ensure the output precision of the full range of the large-current gear, and meets the requirement of high-precision calibration.
Description
Technical Field
The present disclosure relates to the field of power calibration technologies, and in particular, to a method and an apparatus for calibrating output of a high-current pulse power supply, and an electronic device.
Background
The high-current pulse source is an important component in a voltage current source used by ATE (automatic test equipment), is used as equipment for semiconductor packaging and testing mass production, is different from manual calibration of a measuring instrument generally required for a laboratory, is convenient for use of an ATE (automatic test equipment) for a packaging manufacturer, and generally needs to perform automatic calibration on a voltage current source used so as to ensure the output and the measurement precision of the ATE. The calibration items are many, and the most common calibration items are: voltage output calibration, voltage measurement calibration, current output calibration and current measurement calibration.
The current output calibration and the current measurement calibration of a large-current pulse power supply have the biggest defect of insufficient precision in the prior art. The linearity of the output and measurement of a voltage current source, especially a high-precision voltage current source, is a key for determining whether the voltage current source can meet the precision requirement. Many complex calibration algorithms are essentially to solve the problem that the output linearity affects the output precision. Therefore, in order to ensure the calibration effectiveness of the common voltage current source, the voltage and current values which need to be set during calibration require traversing the output capability of the whole power supply, when the high-precision large-current (more than 10A) pulse power supply is output and calibrated, because general multimeters mostly cannot bear such high current, and the time for outputting the large current by the high-precision large-current pulse power supply is very short, generally only a few milliseconds, which is much less than the hundreds of milliseconds required by the multimeter to complete measurement, the current set value cannot be selected according to the full range when the high-precision large-current pulse power supply is output and calibrated in the prior art, the uniform point taking is only performed in the small range where the multimeter can measure and the voltage current source can output for a long time, and the calibration coefficient correction is performed on the large current gear according to the calibration result in the small range, obviously, a great risk is caused, and the calibration accuracy is far from the requirement.
Disclosure of Invention
The application aims to provide a high-current pulse power supply output calibration method, which can measure the resistance value of a load resistor through a high-precision multimeter, calibrate a voltage measurement unit, and complete the calibration of a high-current pulse power supply by using the load resistor and the voltage measurement unit.
In a first aspect, an embodiment of the present application provides a method for calibrating output of a large-current pulse power supply, where the method is applied to ATE; a universal meter and a calibration loop comprising a voltage current source and a load are arranged on the ATE, and the load is a resistor matrix; the load is connected with a voltage measuring unit and a current measuring unit; the method comprises the following steps: determining a target resistance in a load according to a voltage gear to be calibrated and a large current gear to be calibrated, controlling a voltage current source to be connected with the target resistance, controlling a multimeter to measure the resistance value of the target resistance, and calibrating a voltage measuring unit based on the voltage gear to be calibrated; switching a voltage current source to a high-current gear to be calibrated; a plurality of calibration point current values correspond to the gears; determining a first actual current value and a first measured current value respectively corresponding to the voltage current source outputting a plurality of calibration point current values based on the current measuring unit, the calibrated voltage measuring unit and the resistance value; calculating a calibration coefficient corresponding to a high-current gear to be calibrated according to a first actual current value and a first measured current value respectively corresponding to the current values of the plurality of calibration points and the high-current gear to be calibrated; the calibration coefficients are stored in the voltage current source.
In an optional embodiment, the step of determining, based on the current measuring unit, the calibrated voltage measuring unit, and the resistance value, a first actual current value and a first measured current value respectively corresponding to when the plurality of calibration point current values are output includes: taking the plurality of calibration point current values as first current values in sequence, and executing the following operations: controlling the voltage current source to output a first current value; respectively acquiring a first measured current value and a first measured voltage value corresponding to the first current value through a current measuring unit and a calibrated voltage measuring unit; and calculating a first actual current value corresponding to the first current value according to the first measured voltage value and the resistance value.
In an optional embodiment, the step of calculating a calibration coefficient corresponding to a high-current gear to be calibrated according to a first actual current value and a first measured current value respectively corresponding to a plurality of calibration point current values and the high-current gear to be calibrated includes: and performing linear fitting on the first actual current value and the first measured current value respectively corresponding to the current values of the plurality of calibration points and the large-current gear to be calibrated to obtain a calibration coefficient corresponding to the large-current gear to be calibrated.
In an optional embodiment, the method further comprises: determining the current value of at least one test point corresponding to a high-current gear to be calibrated; determining a second actual current value and a second measured current value corresponding to the voltage current source outputting at least one test point current value based on the current measuring unit, the voltage measuring unit and the resistance value under the action of the calibration coefficient; judging whether a first difference value between a second actual current value and a second measured current value respectively corresponding to the current value of each test point and a second difference value between the second measured current value and the current value corresponding to the large-current gear to be calibrated are smaller than a preset threshold value or not; if so, determining that the gear calibration of the large current to be calibrated is successful.
In an optional embodiment, the step of determining, based on the current measuring unit, the voltage measuring unit and the resistance value under the action of the calibration coefficient, a second actual current value and a second measured current value corresponding to when the voltage current source outputs at least one test point current value includes: respectively taking the current value of each test point as a second current value, and executing the following steps: controlling the voltage current source to output a second current value under the action of the calibration coefficient; respectively acquiring a second measured current value and a second measured voltage value corresponding to the second current value through a current measuring unit and a voltage measuring unit; and calculating a second actual current value corresponding to the second current value according to the second measured voltage value and the resistance value.
In an optional embodiment, the measurement accuracy of the multimeter and the voltage measurement unit is greater than the accuracy requirement of the high-current gear to be calibrated.
In an alternative embodiment, the current measuring unit comprises: an ammeter in series with the load; the voltage measuring unit comprises a voltmeter connected in parallel with the load.
In a second aspect, the present application provides a calibration apparatus for a large-current pulse power supply output, where the apparatus is applied to ATE; a universal meter and a calibration loop comprising a voltage current source and a load are arranged on the ATE, and the load is a resistor matrix; the load is connected with a voltage measuring unit and a current measuring unit; the device comprises: the resistance value measuring and voltage calibrating module is used for determining a target resistor in a load according to a voltage gear to be calibrated and a large current gear to be calibrated, controlling a voltage current source to be connected with the target resistor, controlling a universal meter to measure the resistance value of the target resistor, and calibrating a voltage measuring unit based on the voltage gear to be calibrated; the gear switching module is used for switching the voltage current source to a high-current gear to be calibrated; a plurality of calibration point current values correspond to the gears; the calibration point current value determining module is used for determining a first actual current value and a first measured current value which respectively correspond to a plurality of calibration point current values output by the voltage current source based on the current measuring unit, the calibrated voltage measuring unit and the resistance value; the calibration coefficient calculation module is used for calculating calibration coefficients corresponding to the high-current gears to be calibrated according to first actual current values and second measured current values respectively corresponding to the current values of the plurality of calibration points and the high-current gears to be calibrated; and the calibration coefficient storage module is used for storing the calibration coefficient in the voltage current source.
In a third aspect, an embodiment of the present application further provides an electronic device, which includes a processor and a memory, where the memory stores computer-executable instructions that can be executed by the processor, and the processor executes the computer-executable instructions to implement the method in the first aspect.
In a fourth aspect, embodiments of the present application further provide a computer-readable storage medium storing computer-executable instructions that, when invoked and executed by a processor, cause the processor to implement the method of the first aspect.
The embodiment of the application brings the following beneficial effects:
the application provides a heavy current pulse power supply output calibration method, this method is through the resistance of high accuracy universal meter measurement load resistance, and calibration voltage measurement unit, replace the universal meter among the prior art with this load resistance and voltage measurement unit and accomplish subsequent calibration of heavy current pulse power supply, only need to change the calibration logic on prior art can realize, need not increase extra hardware cost for ATE, also need not select expensive heavy current high accuracy exterior meter, the realization method is simple and low cost, can be when the calibration is got some, traverse whole heavy current gear range, can guarantee the output precision of heavy current gear full-scale, satisfy high accuracy calibration requirement.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a structural topology diagram of a voltage current source according to an embodiment of the present application;
FIG. 2 is a diagram illustrating an exemplary relationship between a set value and an output value before calibration in 10A shift according to an embodiment of the present disclosure;
fig. 3 is a flowchart of a method for calibrating output of a high-current pulse power supply according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a calibration apparatus for a voltage current source according to an embodiment of the present disclosure;
fig. 5 is a block diagram of a structure of a calibration apparatus for a large-current pulse power supply output according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The semiconductor Automatic Test refers to detecting various parameter indexes of a Device Under Test (DUT) by using Automatic Test Equipment (ATE), and removing defective goods to control the delivery quality of the semiconductor Device. In order to complete the test, the ATE largely uses a high-precision pulse voltage current source having both adjustable output and measurement functions, wherein the output capability can complete outputting one of the specified voltage or the specified current at a time, and the measurement capability can complete voltage measurement and current measurement at the same time. High current pulse sources are an important component of voltage current sources used in ATE.
Referring to the structural topology of the voltage current source shown in fig. 1, the single-pole double-throw switch K Is used to select the output mode of the current voltage current source, the input current source Is in the boost mode, and the input voltage source Vs Is in the boost mode. Ammeters A2 and V2 are voltage and current source built-in measuring units, and are also calibrated. HF, HS, LS, LF are four output signals of voltage current sources, where HF and LF are power output ports and HS and LS are voltage measurement ports. The load RL is generally a resistor matrix including a plurality of resistance values to meet the calibration requirements of different voltage and current levels of the voltage and current source. Voltmeter V1 and ammeter A1 are current and voltage measuring units of an external high-precision multimeter.
The automatic calibration steps of the voltage current source in the prior art are as follows: (1) selecting a proper load RL, and controlling a voltage current source to output a specified voltage or current; (2) measuring the specified voltage or current by using a universal multimeter V1 or A1 with higher precision and a program control function; (3) recording the measurement result of the multimeter and the measurement result of the voltage current source; (4) according to a certain calibration algorithm, comparing the multimeter and the set value with the multimeter and the self-measurement result, and correcting the set value and the self-measurement result according to a certain model in the bottom layer drive; (5) controlling the voltage current source to output specified voltage and current again, measuring by using a universal meter, comparing a measurement result and a set value of the universal meter with a measurement result of the universal meter and a measurement result of the universal meter, and determining whether a real output value and the measurement value are within a precision range; if the accuracy requirement is not met, the calibration fails; if the accuracy requirement is met, jumping to step 6; (6) and (5) storing the calibration correction coefficient, and finishing calibration.
The greatest disadvantage of the above-mentioned prior art calibration techniques is the lack of accuracy. The linearity of the output and measurement of a voltage current source, especially a high-precision voltage current source, is a key for determining whether the voltage current source can meet the precision requirement. Many complex calibration algorithms are essentially to solve the problem that the output linearity affects the output precision. Therefore, in order to ensure calibration effectiveness, the common voltage current source needs to set voltage and current values during calibration, and needs to traverse the output capability of the whole power supply, for example, a voltage current source with 50V/1A output capability needs to be calibrated, and the set value used during calibration needs to uniformly select a plurality of test points from-50V to 50V and from-1A to 1A, and needs to contain ± 50V, ± 1A, 0V and 0A.
Particularly, when high-precision large-current (more than 10A) pulse power supply output calibration is performed, because a universal multimeter cannot bear such high current mostly, and the time for outputting the large current by the high-precision large-current pulse power supply is very short, generally only a few milliseconds, which is much shorter than the few hundred milliseconds required by the multimeter for completing measurement, in the prior art, when the high-precision large-current pulse power supply output calibration is performed, a current set value is selected according to a full range, taking a 10A range as an example, in the prior art, uniform point taking is performed only within ± 1A which can be measured by the multimeter and a voltage current source can be output for a long time, and a calibration coefficient is corrected for a 10A gear according to a calibration result of ± 1A.
The use of a ± 1A calibration result to estimate a current output and measurement of ± 10A obviously results in a great risk. FIG. 2 is a typical plot of set point versus output value before 10A notch calibration, where it can be seen that the output maintains good linearity with the set point in the range-5A to 5A, but the output deviates significantly from the set point in the range above 5A. If the calibration is carried out in the range of +/-1A, the calibration result is passed, and the influence of the correction coefficient on the output value is small (because the linearity is good in the range of +/-1A), but after the calibration is finished, when the current of 10A is set, the actual output current of the voltage current source is not yet 9A, and the accuracy requirement is far from being met.
Based on this, the embodiment of the application provides a large-current pulse power supply output calibration method, the method aims at the current output calibration and the current measurement calibration of the large-current pulse power supply, the calibration logic can be changed on the basis of the prior art, extra hardware cost does not need to be added for ATE, an expensive large-current high-precision external meter does not need to be selected, the implementation method is simple and low in cost, the whole large-current gear range can be traversed when a point is taken in calibration, the output precision of the large-current gear full range can be guaranteed, and the high-precision calibration requirement is met.
For the convenience of understanding the present embodiment, a detailed description will be given to a method for calibrating the output of a large-current pulse power supply disclosed in the embodiments of the present application.
The embodiment of the application provides a method for calibrating the output of a high-current pulse power supply, which is applied to ATE; a universal meter and a calibration loop comprising a voltage current source and a load are arranged on the ATE, and the load is a resistor matrix; the load is connected with a voltage measuring unit and a current measuring unit.
Referring to a flowchart of a method for calibrating the output of a high-current pulse power supply shown in fig. 3, the method specifically includes the following steps:
step S302, determining a target resistance in a load according to a voltage gear to be calibrated and a large current gear to be calibrated, controlling a voltage current source to be connected with the target resistance, controlling a multimeter to measure the resistance value of the target resistance, and calibrating a voltage measuring unit based on the voltage gear to be calibrated.
The load is generally a resistor matrix, and comprises a plurality of resistance values to adapt to the calibration requirements of different voltage and current gears of the voltage and current source, a proper load resistance value is selected for the calibration of the large-current pulse voltage and current source, and then a multimeter with higher precision is used for measuring to obtain the accurate resistance value of the load resistance value. The voltage measuring module of the large-current pulse voltage current source is calibrated, and the calibration steps are the same as those in the prior art. The two steps of measuring the load resistance value and calibrating the voltage measuring unit may be interchanged in order.
Step S304, switching a voltage current source to a large current gear to be calibrated; the gears correspond to a plurality of calibration point current values.
And removing the universal meter, carrying out high-current gear calibration, controlling the voltage current source to output specified high current, and traversing the whole range for value taking.
Step S306, based on the current measuring unit, the calibrated voltage measuring unit and the resistance value, determining a first actual current value and a first measured current value respectively corresponding to the voltage current source outputting a plurality of calibration point current values.
Measuring the voltage across the load by using the calibrated voltage measuring module, and dividing the voltage by the precise resistance value recorded in the step S302 to obtain the actual current value flowing through the load; and simultaneously recording the current measurement result of the calibrated high-current pulse voltage current source as a measured value.
Step S308, calculating a calibration coefficient corresponding to the high-current gear to be calibrated according to the first actual current value and the first measured current value respectively corresponding to the current values of the plurality of calibration points and the high-current gear to be calibrated.
Comparing the actual value with the set value and comparing the actual value with the measured value according to the selected calibration algorithm, and correcting the calibration coefficient of the set value and the measured value according to the selected model in the bottom layer drive; and controlling the voltage current source to output a specified large current, measuring the load voltage by using the calibrated voltage gear, converting a new 'actual value' and a new 'measured value', comparing the 'actual value' with a set value and the 'actual value' with the 'measured value', determining whether the actual output value and the measured value are in the precision range, if the precision requirement is not met, failing to calibrate, and if the precision requirement is met, jumping to the step S310.
In step S310, the calibration coefficient is stored in the voltage current source. And (5) storing the calibration correction coefficient, and finishing calibration.
The embodiment of the application provides a high-current pulse power supply output calibration method, which is applied to ATE; a universal meter and a calibration loop comprising a voltage current source and a load are arranged on the ATE, and the load is a resistor matrix; the load is connected with a voltage measuring unit and a current measuring unit. The method measures the resistance value of the load resistor through the high-precision universal meter, calibrates the voltage measuring unit, replaces the universal meter in the prior art with the load resistor and the voltage measuring unit to finish subsequent calibration of the large-current pulse power supply, can be realized by only changing calibration logic on the basis of the prior art, is simple in implementation method and low in cost, can ensure the output precision of a large-current gear full-range, and meets the requirement of high-precision calibration.
The embodiment of the application also provides another output calibration method of the high-current pulse power supply, which is realized on the basis of the method of the embodiment; the embodiment takes the calibration requirement that the precision requires five thousandth to finish the calibration of the 100A gear of the large-current pulse voltage current source as an example, and specifically describes the implementation steps of the method:
referring to fig. 4, the current measuring unit a2 in the embodiment of the present application is an ammeter connected in series with the load; the voltage measurement unit V2 is a voltmeter connected in parallel with the load.
Step 1: and calibrating the voltage measuring unit based on the voltage gear to be calibrated. According to the prior art, the low-current gear output calibration, the low-current gear measurement calibration, the voltage gear output calibration and the voltage gear measurement calibration are completed, so that a secondary high-precision high-speed voltage measurement unit V2 can be obtained.
Step 2: and determining a target resistance in the load according to the voltage gear to be calibrated and the large current gear to be calibrated, controlling the voltage current source to be connected with the target resistance, and controlling the multimeter to measure the resistance value of the target resistance. I.e. the multimeter is controlled to measure the accurate resistance RL of the load, which is 19.980 milliohms in this embodiment.
And step 3: switching a voltage current source to a high-current gear to be calibrated; the gears correspond to a plurality of calibration point current values. Taking a current gear of 100A as an example, calibration points, such as-100A, -80A, -60A, -40A, -20A, 0A, 20A, 40A, 60A, 80A, 100A, are selected according to the gear range.
And 4, step 4: taking the plurality of calibration point current values as first current values in sequence, and executing the following operations: controlling the voltage current source to output a first current value; respectively acquiring a first measured current value and a first measured voltage value corresponding to a first current value through a current measuring unit and the calibrated voltage measuring unit; and calculating a first actual current value corresponding to the first current value according to the first measured voltage value and the resistance value.
Sequentially controlling the voltage current source to output the current values, and collecting the measurement results of A2 and V2; the "actual value" of this current output is obtained by dividing the measurement of V2 by RL recorded in step 2. For example, when the voltage across RL measured by V2 is 1.9860V at 100A output, the actual value of the current is calculated as:
it can be seen that the error before calibration reaches 0.6A, i.e. six thousandths, which is greater than five thousandths of the precision requirement.
And 5: and performing linear fitting on the first actual current value and the first measured current value respectively corresponding to the current values of the plurality of calibration points and the large-current gear to be calibrated to obtain a calibration coefficient corresponding to the large-current gear to be calibrated.
And (3) taking the A2 measurement result obtained in the step (4) as a 'measurement value', processing the set value and the 'actual value', 'actual value' and 'measurement value' through a certain selected algorithm (such as linear fitting), obtaining a calibration coefficient of the high-current gear, and storing the calibration coefficient in the voltage current source.
After the coefficient is obtained and before each output, the voltage current source needs to be corrected by the output coefficient after receiving a set value which is manually specified, and then the output is carried out; during measurement, the obtained measurement result needs to be corrected by using the measurement coefficient, and then the corrected data is used for human-computer interaction. Therefore, after the calibration is passed, the error between the current value actually output by the power supply and the set value of the operator and before the observed measured value is within five thousandths of the precision range.
Step 6: determining the current value of at least one test point corresponding to a high-current gear to be calibrated; determining a second actual current value and a second measured current value corresponding to the voltage current source outputting at least one test point current value based on the current measuring unit, the voltage measuring unit and the resistance value under the action of the calibration coefficient; and judging whether a first difference value between a second actual current value and a second measured current value respectively corresponding to the current value of each test point and a second difference value between the second measured current value and the current value corresponding to the large-current gear to be calibrated are smaller than a preset threshold value or not. If so, determining that the gear calibration of the large current to be calibrated is successful.
After the calibration coefficient is obtained, calibration is not finished, and inspection operation is required, namely, some test points are selected to inspect the output and the measurement precision of the power supply. Taking the 100A gear as an example, the test points selected by us may be: -100A, -70A, -50A, -30A, 0A, 30A, 50A, 70A, 100A. These values are output sequentially, again using the measurement of A2 to compare with the "actual value" of current obtained by dividing V2 by RL, requiring that the output error for each point be within five thousandths of the precision. If this requirement is met, the calibration passes, if not, the calibration fails.
In the method, in order to ensure the calibration precision, the multimeter precision of the used calibration voltage measurement unit and the precision of the calibrated voltage measurement unit are far higher than the high-current gear to be calibrated. For example, if the accuracy of the large current gear is required to be five thousandths, a multimeter with an accuracy of more than five millionths and a voltage source V2 with an accuracy of more than five thousandths are recommended.
The embodiment of the application provides a large-current pulse power supply output calibration method, which changes calibration logic on the basis of the prior art, can realize 100A gear calibration of a large-current pulse voltage current source, can traverse the whole large-current gear range when calibrating and taking points, is simple in realization method and low in cost, ensures the output precision of five thousandths of the full range of the large-current gear, and meets the requirement of high-precision calibration.
Based on the method embodiment, the embodiment of the application also provides a large-current pulse power supply output calibration device, which is applied to ATE; a universal meter and a calibration loop comprising a voltage current source and a load are arranged on the ATE, and the load is a resistor matrix; the load is connected with a voltage measuring unit and a current measuring unit; referring to fig. 5, the apparatus includes:
the resistance value measuring and voltage calibrating module 51 is used for determining a target resistor in a load according to a voltage gear to be calibrated and a large current gear to be calibrated, controlling a voltage current source to be connected with the target resistor, controlling a multimeter to measure the resistance value of the target resistor, and calibrating a voltage measuring unit based on the voltage gear to be calibrated; the gear switching module 52 is configured to switch the voltage current source to a high-current gear to be calibrated; a plurality of calibration point current values correspond to the gears; a calibration point current value determining module 53, configured to determine, based on the current measuring unit, the calibrated voltage measuring unit, and the resistance value, a first actual current value and a first measured current value respectively corresponding to the voltage current source outputting a plurality of calibration point current values; the calibration coefficient calculation module 54 is configured to calculate a calibration coefficient corresponding to a high-current gear to be calibrated according to a first actual current value and a second measured current value respectively corresponding to the current values of the plurality of calibration points and the high-current gear to be calibrated; and a calibration coefficient storage module 55 for storing a calibration coefficient in the voltage current source.
The large-current pulse power supply output calibration device provided by the embodiment of the application can calibrate the voltage measurement unit through the resistance value measurement and voltage calibration module, completes the calibration of the large-current pulse power supply by using the measured load resistance and the calibrated voltage measurement unit, is simple in implementation method and low in cost, can ensure the output precision of a large-current gear full range, and meets the high-precision calibration requirement.
The calibration point current value determination module 53 is further configured to take the plurality of calibration point current values as the first current value in sequence, and each perform the following operations: controlling the voltage current source to output a first current value; respectively acquiring a first measured current value and a first measured voltage value corresponding to the first current value through a current measuring unit and a calibrated voltage measuring unit; and calculating a first actual current value corresponding to the first current value according to the first measured voltage value and the resistance value.
The calibration coefficient calculation module 54 is further configured to perform linear fitting on the first actual current value and the first measured current value respectively corresponding to the current values of the plurality of calibration points and the large-current gear to be calibrated, so as to obtain a calibration coefficient corresponding to the large-current gear to be calibrated.
The above-mentioned device still includes: the detection module is used for determining the current value of at least one test point corresponding to a high-current gear to be calibrated; determining a second actual current value and a second measured current value corresponding to the voltage current source outputting at least one test point current value based on the current measuring unit, the voltage measuring unit and the resistance value under the action of the calibration coefficient; judging whether a first difference value between a second actual current value and a second measured current value respectively corresponding to the current value of each test point and a second difference value between the second measured current value and the current value corresponding to the large-current gear to be calibrated are smaller than a preset threshold value or not; if so, determining that the gear calibration of the large current to be calibrated is successful.
The detection module is further configured to take the current value of each test point as a second current value, and execute the following steps: controlling the voltage current source to output a second current value under the action of the calibration coefficient; respectively acquiring a second measured current value and a second measured voltage value corresponding to the second current value through a current measuring unit and a voltage measuring unit; and calculating a second actual current value corresponding to the second current value according to the second measured voltage value and the resistance value.
In the device, the measurement precision of the multimeter and the voltage measurement unit is greater than the precision requirement of the gear of the large current to be calibrated.
In the above apparatus, the current measuring unit includes: an ammeter in series with the load; the voltage measuring unit comprises a voltmeter connected in parallel with the load.
The device provided by the embodiment of the present application has the same implementation principle and technical effect as those of the foregoing method embodiments, and for the sake of brief description, no mention is made in the embodiment of the device, and reference may be made to the corresponding contents in the foregoing method embodiments.
An electronic device is further provided in the embodiment of the present application, as shown in fig. 6, which is a schematic structural diagram of the electronic device, where the electronic device includes a processor 61 and a memory 60, the memory 50 stores computer-executable instructions that can be executed by the processor 61, and the processor 61 executes the computer-executable instructions to implement the method.
In the embodiment shown in fig. 6, the electronic device further comprises a bus 62 and a communication interface 63, wherein the processor 61, the communication interface 63 and the memory 60 are connected by the bus 62.
The Memory 60 may include a high-speed Random Access Memory (RAM) and may also include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The communication connection between the network element of the system and at least one other network element is realized through at least one communication interface 63 (which may be wired or wireless), and the internet, a wide area network, a local network, a metropolitan area network, and the like can be used. The bus 62 may be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The bus 62 may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one double-headed arrow is shown in FIG. 6, but that does not indicate only one bus or one type of bus.
The processor 61 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 61. The Processor 61 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and the processor 61 reads information in the memory and performs the steps of the method of the previous embodiment in combination with its hardware.
Embodiments of the present application further provide a computer-readable storage medium, where computer-executable instructions are stored, and when the computer-executable instructions are called and executed by a processor, the computer-executable instructions cause the processor to implement the method, and specific implementation may refer to the foregoing method embodiments, and is not described herein again.
The method, the apparatus, and the computer program product of the electronic device provided in the embodiments of the present application include a computer-readable storage medium storing a program code, where instructions included in the program code may be used to execute the method described in the foregoing method embodiments, and specific implementation may refer to the method embodiments, and will not be described herein again.
Unless specifically stated otherwise, the relative steps, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present application.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the exemplary embodiments of the present application, and are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The output calibration method of the large-current pulse power supply is characterized by being applied to ATE; a universal meter and a calibration loop comprising a voltage current source and a load are arranged on the ATE, and the load is a resistor matrix; the load is connected with a voltage measuring unit and a current measuring unit; the method comprises the following steps:
determining a target resistance in the load according to a voltage gear to be calibrated and a large current gear to be calibrated, controlling the voltage current source to be connected with the target resistance, controlling the universal meter to measure the resistance value of the target resistance, and calibrating the voltage measuring unit based on the voltage gear to be calibrated;
switching the voltage current source to the high-current gear to be calibrated; the gears correspond to a plurality of calibration point current values;
determining a first actual current value and a first measured current value respectively corresponding to the voltage current source outputting a plurality of current values of the calibration point based on the current measuring unit, the calibrated voltage measuring unit and the resistance value;
calculating a calibration coefficient corresponding to the high-current gear to be calibrated according to a first actual current value and a first measured current value respectively corresponding to the current values of the plurality of calibration points and the high-current gear to be calibrated;
storing the calibration coefficients in the voltage current source.
2. The method of claim 1, wherein the step of determining a first actual current value and a first measured current value respectively corresponding to the output of the plurality of calibration point current values based on the current measuring unit, the calibrated voltage measuring unit, and the resistance value comprises:
taking a plurality of calibration point current values as first current values in sequence, and executing the following operations:
controlling the voltage current source to output the first current value;
respectively acquiring a first measured current value and a first measured voltage value corresponding to the first current value through the current measuring unit and the calibrated voltage measuring unit;
and calculating a first actual current value corresponding to the first current value according to the first measured voltage value and the resistance value.
3. The method according to claim 1, wherein the step of calculating the calibration coefficient corresponding to the high-current gear to be calibrated according to the first actual current value and the first measured current value respectively corresponding to the current values of the plurality of calibration points and the high-current gear to be calibrated includes:
and performing linear fitting on a first actual current value and a first measured current value which correspond to the current values of the plurality of calibration points respectively and the large-current gear to be calibrated to obtain a calibration coefficient corresponding to the large-current gear to be calibrated.
4. The method of claim 1, further comprising:
determining the current value of at least one test point corresponding to the high-current gear to be calibrated;
determining a second actual current value and a second measured current value corresponding to the voltage current source outputting at least one test point current value based on the current measuring unit, the voltage measuring unit and the resistance value under the action of the calibration coefficient;
judging whether a first difference value between a second actual current value and a second measured current value corresponding to the current value of each test point and a second difference value between the second measured current value and the current value corresponding to the large-current gear to be calibrated are smaller than a preset threshold value or not;
and if so, determining that the high-current gear to be calibrated is successfully calibrated.
5. The method of claim 4, wherein the step of determining a second actual current value and a second measured current value corresponding to the voltage current source outputting at least one of the test point current values based on the current measuring unit, the voltage measuring unit and the resistance value under the action of the calibration coefficient comprises:
respectively taking the current value of each test point as a second current value, and executing the following steps:
controlling the voltage current source under the action of the calibration coefficient to output the second current value;
respectively acquiring a second measured current value and a second measured voltage value corresponding to the second current value through the current measuring unit and the voltage measuring unit;
and calculating a second actual current value corresponding to the second current value according to the second measured voltage value and the resistance value.
6. The method of claim 1, wherein the measurement accuracy of the multimeter and the voltage measurement unit are greater than the accuracy requirement of the high current stage to be calibrated.
7. The method of claim 1, wherein the current measurement unit comprises: an ammeter in series with the load; the voltage measurement unit includes a voltmeter connected in parallel with the load.
8. The output calibration device of the large-current pulse power supply is characterized in that the device is applied to ATE; a universal meter and a calibration loop comprising a voltage current source and a load are arranged on the ATE, and the load is a resistor matrix; the load is connected with a voltage measuring unit and a current measuring unit; the device comprises:
the resistance value measuring and voltage calibrating module is used for determining a target resistor in the load according to a voltage gear to be calibrated and a large current gear to be calibrated, controlling the voltage current source to be connected with the target resistor, controlling the universal meter to measure the resistance value of the target resistor, and calibrating the voltage measuring unit based on the voltage gear to be calibrated;
the gear switching module is used for switching the voltage current source to the high-current gear to be calibrated; the gears correspond to a plurality of calibration point current values;
a calibration point current value determining module, configured to determine, based on the current measuring unit, the calibrated voltage measuring unit, and the resistance value, a first actual current value and a first measured current value respectively corresponding to when the voltage current source outputs a plurality of calibration point current values;
the calibration coefficient calculation module is used for calculating a calibration coefficient corresponding to the high-current gear to be calibrated according to a first actual current value and a second measured current value which correspond to the current values of the plurality of calibration points respectively and the high-current gear to be calibrated;
and the calibration coefficient storage module is used for storing the calibration coefficient in the voltage current source.
9. An electronic device comprising a processor and a memory, the memory storing computer-executable instructions executable by the processor, the processor executing the computer-executable instructions to implement the method of any of claims 1 to 7.
10. A computer-readable storage medium having computer-executable instructions stored thereon which, when invoked and executed by a processor, cause the processor to implement the method of any of claims 1 to 7.
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| CN202111532994.8A CN114252798A (en) | 2021-12-15 | 2021-12-15 | Large-current pulse power supply output calibration method and device and electronic equipment |
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| CN202111532994.8A CN114252798A (en) | 2021-12-15 | 2021-12-15 | Large-current pulse power supply output calibration method and device and electronic equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115328006A (en) * | 2022-10-13 | 2022-11-11 | 苏州华兴源创科技股份有限公司 | Signal control circuit |
| CN116185784A (en) * | 2023-04-25 | 2023-05-30 | 荣耀终端有限公司 | Calibration device, calibration system and acquisition system |
| CN116859223A (en) * | 2023-09-05 | 2023-10-10 | 西安赛英特科技有限公司 | On-line self-checking method and circuit for VI source and VI source |
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2021
- 2021-12-15 CN CN202111532994.8A patent/CN114252798A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115328006A (en) * | 2022-10-13 | 2022-11-11 | 苏州华兴源创科技股份有限公司 | Signal control circuit |
| CN115328006B (en) * | 2022-10-13 | 2023-01-20 | 苏州华兴源创科技股份有限公司 | Signal control circuit |
| CN116185784A (en) * | 2023-04-25 | 2023-05-30 | 荣耀终端有限公司 | Calibration device, calibration system and acquisition system |
| CN116859223A (en) * | 2023-09-05 | 2023-10-10 | 西安赛英特科技有限公司 | On-line self-checking method and circuit for VI source and VI source |
| CN116859223B (en) * | 2023-09-05 | 2023-12-08 | 西安赛英特科技有限公司 | On-line self-checking method and circuit for VI source and VI source |
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