CN113203520B - Pressure sensor debugging system and method - Google Patents
Pressure sensor debugging system and method Download PDFInfo
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- CN113203520B CN113203520B CN202110606397.9A CN202110606397A CN113203520B CN 113203520 B CN113203520 B CN 113203520B CN 202110606397 A CN202110606397 A CN 202110606397A CN 113203520 B CN113203520 B CN 113203520B
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000003750 conditioning effect Effects 0.000 claims abstract description 168
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 10
- 230000001105 regulatory effect Effects 0.000 claims description 9
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- 238000004891 communication Methods 0.000 claims description 6
- 230000005284 excitation Effects 0.000 claims description 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
- G01L27/005—Apparatus for calibrating pressure sensors
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Abstract
The embodiment of the invention discloses a method for debugging a pressure sensor, which comprises the following steps: respectively carrying out zero point and amplitude debugging on a plurality of conditioning circuit boards to be tested to obtain a first zero point compensation resistor and a first amplitude compensation resistor corresponding to the plurality of conditioning circuit boards; the corresponding first zero compensation resistor and first amplitude compensation resistor are respectively connected to the circuits of the plurality of conditioning circuit boards, the output voltages of the plurality of conditioning circuit boards to be tested under different temperatures and different input voltages are measured, and the measured output voltage values are stored in a database; measuring output voltages of a plurality of cores to be measured under different temperature and different pressure inputs respectively, and storing the measured output voltage values into a database; and combining the corresponding first to-be-measured conditioning circuit board and the first to-be-measured core according to the output voltage values of the plurality of conditioning circuit boards and the output voltage values of the plurality of cores under the same temperature measurement, so that the combined output voltage value of the first pressure sensor is in a preset range.
Description
Technical Field
The embodiment of the invention relates to the field of sensor correction, in particular to a pressure sensor debugging system and a pressure sensor debugging method.
Background
The domestic sensor manufacturer randomly connects the core body with the conditioning circuit board when calibrating the pressure sensor, the conditioning circuit board is provided with zeroing and amplitude modulation compensation resistors which are respectively connected to the resistor boxes, and each product is manually and sequentially debugged. Firstly, regulating the pressure to the zero pressure, observing the output value of a sensor, then manually regulating the resistance value of a resistor box connected with a zero resistor, observing data, repeatedly regulating until the output of the sensor meets the requirement, then adding the pressure to the full range, regulating the resistance value of the resistor box connected with an amplitude resistor, repeatedly regulating the observed data until the output of the sensor meets the requirement, then returning to the zero again, normally changing the zero because of the change of the amplitude resistor, continuously regulating the zero resistance value, then regulating the amplitude resistance value again, and repeating the steps until the zero and the amplitude meet the requirement. The traditional pressure sensor is low in debugging efficiency, not suitable for batch products, is debugged manually, and is inevitably free from errors, and because the core body and the conditioning circuit board are debugged in a combined mode at random, unqualified core bodies or conditioning circuit boards and high-low temperature deviation of the core body or the conditioning circuit boards exceeds an error allowable range in the debugging process, sensor debugging failure is caused, and production efficiency and product qualification rate are greatly affected.
Disclosure of Invention
Therefore, the embodiment of the invention provides a pressure sensor debugging system and a pressure sensor debugging method, which are used for solving the problems that the debugging efficiency of the debugging method in the prior art is low, the debugging method is not suitable for batch products, the error is large, and the debugging failure of a sensor is caused by the fact that a core body or a conditioning circuit board is unqualified and the high-low temperature deviation of the core body or the conditioning circuit board exceeds the error allowable range in the debugging process due to the fact that the core body and the conditioning circuit board are randomly subjected to combined debugging.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
in one aspect of an embodiment of the present invention, there is provided a debugging method of a pressure sensor including a core and a conditioning circuit board, the debugging method including: step 1: respectively carrying out zero point and amplitude debugging on a plurality of conditioning circuit boards to be tested to obtain a first zero point compensation resistor and a first amplitude compensation resistor corresponding to the plurality of conditioning circuit boards; step 2: the corresponding first zero compensation resistor and the first amplitude compensation resistor are respectively connected to the circuits of the plurality of conditioning circuit boards, the output voltages of the plurality of conditioning circuit boards to be tested at different temperatures and different input voltages are measured, and the measured output voltage values of the plurality of conditioning circuit boards are stored in a database; step 3: measuring output voltages of a plurality of cores to be measured under different temperature and different pressure inputs respectively, and storing the measured output voltage values of the cores into a database; step 4: and combining the corresponding first to-be-measured conditioning circuit board and the first to-be-measured core according to the output voltage values of the plurality of conditioning circuit boards and the output voltage values of the plurality of cores in the database under the same temperature measurement, so that the combined output voltage value of the first pressure sensor is in a preset range.
Further, the output voltages of the plurality of conditioning circuit boards to be tested under different temperatures and different input voltages are measured in the step 2, specifically: respectively collecting output voltages of the conditioning circuit boards under n input voltages at the first temperature, the second temperature and the third temperature; wherein n is a positive integer, the first temperature is less than the second temperature and greater than the third temperature.
Further, in step 3, output voltages of the plurality of cores to be measured under different temperature and different pressure inputs are measured, specifically: respectively collecting output voltages of the plurality of cores at m input pressures at the first temperature, the second temperature and the third temperature; wherein m is a positive integer.
Further, the step 4 further includes: and storing unmatched data in the plurality of cores to be detected and the plurality of conditioning circuits to be detected into the database, and carrying out matching again after the data of the next batch of products are acquired.
Further, n.gtoreq.6, m.gtoreq.6, n=m.
Further, the method for debugging the pressure sensor further comprises the following steps: step 5: acquiring a second amplitude compensation resistor of the first conditioning circuit board to be tested according to the combination of the first conditioning circuit board to be tested and the first core to be tested; step 6: acquiring a second zero compensation resistor of the first conditioning circuit board to be tested according to the combination of the first conditioning circuit board to be tested and the first core to be tested; step 7: and connecting the second amplitude compensation resistor and the second zero compensation resistor to the circuit of the first conditioning circuit board to be tested, and testing the output voltage of the first pressure sensor.
Further, the step 3 specifically comprises: and respectively providing constant excitation current for the plurality of cores to be tested, and collecting output voltages of the plurality of cores to be tested under different pressure outputs.
Further, in step 4, according to the output voltage values of the plurality of conditioning circuit boards and the output voltage values of the plurality of cores in the database under the same temperature measurement, the corresponding first conditioning circuit board to be tested and the first core to be tested are combined, specifically: and carrying out maximum matching combination on the plurality of cores to be detected and the plurality of conditioning circuit boards, wherein the maximum matching combination is realized based on a bipartite graph maximum matching algorithm.
In another aspect of an embodiment of the present invention, there is provided a debugging system of a pressure sensor including a core and a conditioning circuit board, the debugging system comprising: the core body tool is provided with a plurality of core bodies to be tested; the conditioning circuit board tool comprises a conditioning circuit board tool, a plurality of to-be-measured conditioning circuit boards and a control unit, wherein the conditioning circuit boards to be measured are respectively arranged on the conditioning circuit board tool; the core body tool and the conditioning circuit board tool are respectively arranged in the high-low temperature box, and the high-low temperature box can regulate the internal temperature; the resistor box is respectively connected with the plurality of conditioning circuit boards to be tested, and is used for debugging the first zero compensation resistor and the first amplitude compensation resistor of the plurality of conditioning circuit boards to be tested; the pressure controller is used for controlling the pressure applied to the plurality of cores to be tested; the constant voltage source power supply module is connected with the conditioning circuit board tool and used for providing constant voltage for the plurality of conditioning circuit boards to be tested; the constant current source power supply module is connected with the core tool and used for providing constant current for the plurality of cores to be tested; the universal meter is used for respectively connecting the corresponding first zero compensation resistor and the first amplitude compensation resistor to the circuits of the plurality of conditioning circuit boards, measuring the output voltages of the plurality of conditioning circuit boards to be measured under different temperatures and different input voltages, and measuring the output voltages of the plurality of cores to be measured under different temperatures and different pressure inputs; the database module is used for storing the measured output voltage values of the plurality of conditioning circuit boards into a database, and storing the measured output voltage values of the plurality of cores into the database; and the multi-way switch module is used for controlling the communication state of the constant voltage source power supply module and the conditioning circuit board tool and controlling the communication state of the constant current source power supply module and the core tool.
Further, the debugging system of the pressure sensor further comprises: and the automatic screening module combines the corresponding first to-be-tested conditioning circuit board and the first to-be-tested core body according to the output voltage values of the conditioning circuit boards and the output voltage values of the core bodies in the database under the same temperature measurement, so that the output voltage value of the combined first pressure sensor is in a preset range.
Embodiments of the present invention have the following advantages:
the embodiment of the invention discloses a pressure sensor debugging system and a debugging method, wherein the debugging method comprises the steps of firstly carrying out zero point and amplitude debugging on a to-be-tested conditioning circuit board through adjusting zero point and amplitude compensation resistance, then collecting and adjusting the output of the to-be-tested conditioning circuit board under a plurality of (more than or equal to 6) input voltages at three temperatures of normal temperature, high temperature and low temperature, collecting and recording the output of a to-be-tested core under a plurality of (more than or equal to 6) pressure points at the three temperatures of normal temperature, high temperature and low temperature in respective databases, and then obtaining corresponding matching combinations of each to-be-tested core and the to-be-tested circuit board based on the deviation of the to-be-tested core and the to-be-tested conditioning circuit board at the high temperature and the low temperature, and connecting the conditioning circuit and the core according to the combination result. Therefore, in the debugging process of the pressure sensor, the combination of the core to be tested and the conditioning circuit board to be tested is maximized, the efficiency and the productivity can be improved, batch debugging and temperature compensation are completed, the matching success rate of the core to be tested and the conditioning circuit board to be tested is improved to a certain extent, the production efficiency is improved, the high-low temperature output characteristic of the sensor is improved, and meanwhile, the front-end process can be guided according to matching data.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those skilled in the art from this disclosure that the drawings described below are merely exemplary and that other embodiments may be derived from the drawings provided without undue effort.
The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the invention, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present invention, should fall within the ambit of the technical disclosure.
Fig. 1 is a schematic path diagram of a method for debugging a pressure sensor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a debugging system for a pressure sensor according to an embodiment of the present invention;
fig. 3 is a flow chart of another method for debugging a pressure sensor according to an embodiment of the present invention.
In the figure: 10-core body tool, 20-conditioning circuit board tool, 30-high-low temperature box, 40-resistor box, 50-pressure controller, 60-constant voltage source power supply module, 70-constant current source power supply module, 80-universal meter and 90-multi-way switch module.
Detailed Description
Other advantages and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms such as "upper", "lower", "left", "right", "middle" and the like are also used in the present specification for convenience of description, but are not intended to limit the scope of the present invention, and the changes or modifications of the relative relationship thereof are considered to be within the scope of the present invention without substantial modification of the technical content.
Example 1
Referring to schematic path diagrams of a debugging method of a pressure sensor shown in fig. 1 and 3, embodiment 1 of the present invention provides a debugging method of a pressure sensor, where the pressure sensor includes a core and a conditioning circuit board, and the debugging method includes: step 1: and respectively carrying out zero point and amplitude debugging on the plurality of conditioning circuit boards to be tested to obtain a first zero point compensation resistor and a first amplitude compensation resistor corresponding to the plurality of conditioning circuit boards.
Step 2: the corresponding first zero compensation resistor and the first amplitude compensation resistor are respectively connected to the circuits of the plurality of conditioning circuit boards, the output voltages of the plurality of conditioning circuit boards to be tested under different temperatures and different input voltages are measured, and the measured output voltage values of the plurality of conditioning circuit boards are stored in a database.
Step 3: and measuring output voltages of the cores to be measured under different temperature and different pressure inputs respectively, and storing the measured output voltage values of the cores into a database.
Step 4: according to the output voltage values of the conditioning circuit boards and the output voltage values of the cores in the same temperature measurement in the database, the corresponding first to-be-measured conditioning circuit boards and the first to-be-measured cores are combined, so that the combined output voltage value of the first pressure sensor is in a preset range.
In this embodiment 1, step 4 specifically includes: 4-1: and according to zero point and amplitude deviation data of a plurality of first to-be-measured conditioning circuit boards in the database at high and low temperatures and deviation data of zero point amplitude values of a plurality of first to-be-measured cores in the database at high and low temperatures. Combining the first conditioning circuit to be tested and the first core to be tested in sequence, and respectively adding the zero point deviation of the selected first conditioning circuit to be tested and the zero point deviation of the selected first core to be tested after the combination; and adding the amplitude deviation of the selected first conditioning circuit to be detected and the amplitude deviation of the selected first core to be detected, and recording the combination of the zero point and the amplitude deviation which meet the deviation requirement after adding to a database.
4-2: one conditioning circuit can appear from the combination obtained above and can be combined with multiple cores at the same time.
4-3: and combining the first to-be-detected conditioning circuits and the first to-be-detected cores which meet the deviation requirement after combination through a bipartite graph method, combining the first to-be-detected cores and the first to-be-detected conditioning circuit boards one by one in a traversing mode, matching the maximum combination quantity which meets the deviation requirement, combining each first to-be-detected conditioning circuit with one first to-be-detected core, and recording the combination result into a database.
Specifically, in step 2, the output voltages of the conditioning circuit boards to be tested at different temperatures and different input voltages are measured, specifically: output voltages of the conditioning circuit boards under n input voltages at the first temperature, the second temperature and the third temperature are respectively collected. Wherein n is a positive integer, and the first temperature is less than the second temperature and greater than the third temperature.
In step 3, output voltages of the plurality of cores to be measured under different temperature and different pressure inputs are measured, specifically: respectively collecting output voltages of the multiple cores under m input pressures at the first temperature, the second temperature and the third temperature; wherein m is a positive integer. Alternatively, n is greater than or equal to 6, m is greater than or equal to 6, and n=m.
As shown in fig. 3, step 3 specifically includes: and respectively providing constant excitation current for the plurality of cores to be tested, and collecting output voltages of the plurality of cores to be tested under different pressure outputs.
As shown in fig. 1 and 3, step 4 further includes: and storing unmatched data in the plurality of cores to be tested and the plurality of conditioning circuits to be tested into a database, and carrying out matching again after the data of the next batch of products are acquired.
In step 4, according to the output voltage values of the plurality of conditioning circuit boards and the output voltage values of the plurality of cores in the database under the same temperature measurement, the corresponding first conditioning circuit board to be tested and the first core to be tested are combined, specifically: the maximum matching combination of the cores to be tested and the conditioning circuit boards is realized based on a bipartite graph maximum matching algorithm.
In embodiment 1, as shown in fig. 1 and 3, the debugging method further includes: step 5: and obtaining a second amplitude compensation resistor of the first conditioning circuit board to be tested according to the combination of the first conditioning circuit board to be tested and the first core body to be tested.
Step 6: and obtaining a second zero compensation resistor of the first conditioning circuit board to be tested according to the combination of the first conditioning circuit board to be tested and the first core body to be tested.
Step 7: and connecting the second amplitude compensation resistor and the second zero compensation resistor to the circuit of the first conditioning circuit board to be tested, and testing the output voltage of the first pressure sensor.
As shown in fig. 2, embodiment 1 of the present invention further provides a debugging system of a pressure sensor, where the pressure sensor includes a core and a conditioning circuit board, and the debugging system includes: the core body fixture 10 is provided with a plurality of core bodies to be tested, which are respectively arranged on the core body fixture 10; a conditioning circuit board fixture 20, wherein a plurality of conditioning circuit boards to be tested are respectively arranged on the conditioning circuit board fixture 20; the high-low temperature box 30, the core tool 10 and the conditioning circuit board tool 20 are respectively arranged in the high-low temperature box 30, and the high-low temperature box 30 can regulate the internal temperature; the resistor box 40 is respectively connected with the plurality of conditioning circuit boards to be tested, and is used for debugging a first zero compensation resistor and a first amplitude compensation resistor of the plurality of conditioning circuit boards to be tested; a pressure controller 50 for controlling the amount of pressure applied to the plurality of cores to be measured; the constant voltage source power supply module 60 is connected with the conditioning circuit board tooling 20 and is used for providing constant voltage for a plurality of conditioning circuit boards to be tested; the constant current source power supply module 70 is connected with the core tool 10 and is used for providing constant current for a plurality of cores to be tested; the universal meter 80 is used for respectively connecting the corresponding first zero compensation resistor and the first amplitude compensation resistor into the circuits of the plurality of conditioning circuit boards, measuring the output voltages of the plurality of conditioning circuit boards to be measured under different temperatures and different input voltages, and measuring the output voltages of the plurality of cores to be measured under different temperatures and different pressure inputs; the database module stores the measured output voltage values of the plurality of conditioning circuit boards into a database, and the database module stores the measured output voltage values of the plurality of cores into the database; the multi-way switch module 90 controls the communication state of the constant voltage source power supply module 60 and the conditioning circuit board tooling 20, and controls the communication state of the constant current source power supply module 70 and the core tooling 10.
Optionally, the pressure sensor debugging system further includes: and the automatic screening module combines the corresponding first conditioning circuit board to be tested and the first core to be tested according to the output voltage values of the conditioning circuit boards and the output voltage values of the cores in the database under the same temperature measurement, so that the output voltage value of the combined first pressure sensor is in a preset range.
Example 2
As shown in fig. 1, 2 and 3, embodiment 2 of the present invention provides a debugging system and a debugging method of a pressure sensor.
The pressure sensor used in this example is a pressure sensor with a core measuring range of 50-800Kpa, and the output of the core and the conditioning circuit board is 0.375-6V + -220 mV after the core is connected. The standard zero voltage of the sensor is 0.375V, the standard amplitude voltage of the sensor is 6V, the zero compensation resistor is a compensation resistor corresponding to the zero input voltage, the amplitude compensation resistor is a compensation resistor corresponding to the amplitude input voltage, and the test system structure is shown in figure 2.
Referring to fig. 3, in embodiment 2, the method for debugging the pressure sensor specifically includes the following steps:
the first step: the conditioning circuit board to be tested performs zero point and amplitude adjustment by adjusting the compensation resistor at the normal temperature of 25 ℃, and then performs data acquisition at the normal temperature of 25 ℃, the high temperature of 125 ℃ and the low temperature of-45 ℃.
According to the sensor characteristics of the batch, the zero input voltage was 2.0016V and the amplitude input voltage was 2.0256V.
(1) The constant voltage source power supply module 60 is used for providing input voltage for the conditioning circuit board to be tested, the conditioning circuit board to be tested is mounted on a specific conditioning circuit board fixture 20, and then the fixture is placed in the high-low temperature box 30. In the environment of 25 ℃, the zero compensation resistor and the amplitude compensation resistor of the conditioning circuit board to be tested are respectively connected to the program-controlled resistor box 40, zero and amplitude input voltages are input to debug the zero and the amplitude of the conditioning circuit board to be tested, and the obtained resistance value of the first zero compensation resistor and the resistance value of the first amplitude compensation resistor are stored in the database module, as follows:
according to the characteristics of the batch of sensors, the regulating circuit board debugging voltage is as follows: 2.0016V, 2.0032V, 2.0064V, 2.0128V, 2.0192V, 2.0256V.
(2) Inputting the compensation resistors debugged in the step 1 to a plurality of conditioning circuit boards to be tested respectively, inputting debugging voltage after the environment in the high-low temperature box 30 reaches the set temperature of 25 ℃, collecting the output corresponding to each voltage of the plurality of conditioning circuit boards to be tested, and storing the tested data into a database module, wherein the steps are as follows:
when the environment in the high-low temperature box 30 reaches the set 125 ℃, inputting debugging voltage, collecting the output corresponding to each voltage of a plurality of conditioning circuit boards to be tested, and storing the tested data into a database module, wherein the steps are as follows:
after the environment in the high-low temperature box 30 reaches the set temperature of minus 45 ℃, inputting debugging voltage, collecting output corresponding to each voltage of a plurality of conditioning circuit boards to be tested, and storing the tested data into a database module, wherein the steps are as follows:
and a second step of: collecting the output of a plurality of cores to be tested at 6 pressure points at the temperature of 25 ℃ at normal temperature, 125 ℃ at high temperature and at the temperature of-45 ℃ at low temperature.
Specifically, the constant current source power supply module 70 is used for providing excitation current of 1mA for the core to be measured of the pressure sensor, the core to be measured is installed on the specific core tool 10, then the tool is placed in the high-low temperature box 30, after the environment in the temperature box reaches the set temperature of 25 ℃, the pressure controller 50 is used for controlling the pressure to apply 50Kpa, 100Kpa, 200Kpa, 400Kpa, 600Kpa and 800Kpa to the core to be measured, the high-precision multimeter 80 is used for collecting respective output of the core to be measured, and measured data are stored in the database module as follows:
when the internal environment of the high-low temperature box 30 reaches the set temperature of 125 ℃, the pressure controller 50 controls the pressure to apply 50Kpa, 100Kpa, 200Kpa, 400Kpa, 600Kpa and 800Kpa to the core to be tested, the high-precision multimeter 80 is used for collecting the respective output of the core to be tested, and the measured data are stored in the database module as follows:
when the internal environment of the high-low temperature box 30 reaches the set temperature of minus 45 ℃, the pressure controller 50 controls the pressure to apply 50Kpa, 100Kpa, 200Kpa, 400Kpa, 600Kpa and 800Kpa pressure to the core to be detected, the high-precision multimeter 80 is used for collecting the respective output of the core to be detected, and the measured data are stored in the database module as follows:
step 3: and matching the core to be tested with the conditioning circuit board to be tested.
And the acquired data of the core to be tested and the conditioning circuit board to be tested at normal temperature, high temperature and low temperature are retrieved from the database module, the maximum matching method is used for matching according to the difference of the output characteristics and the temperature characteristics of the core to be tested and the conditioning circuit board to be tested, the set reference value and the error range are combined, the matching result is output, and the matching result is stored in a matching table of the core of the database module and the conditioning circuit, and is put into a pending table of the database module for unsuccessful matching.
Step 4: and (3) solving an amplitude compensation resistor of the conditioning circuit according to the combined result of the first core to be detected and the first conditioning circuit board to be detected obtained in the step (3).
According to the combined result of the core to be tested and the conditioning circuit board to be tested, the current output of the circuit board is measured, and then calculation is carried out according to a formula to obtain the amplitude resistance:
rf= (core 1mA down range/reference range) circuit board current output standard amplitude resistor (1)
According to this formula, the core 1 is illustrated in connection with this batch of sensor characteristics:
Rf＝(22.532/24)*0.942*4103＝3628.6Ω
step 5: and (3) solving a zero compensation resistor of the conditioning circuit according to the combination result of the core body and the conditioning circuit board obtained in the step (3).
Algorithm 1: according to the combined result of the core body and the conditioning circuit board, inputting the amplitude resistor calculated in the step 4, inputting the zero resistor according to the standard zero resistor debugged by the circuit board, measuring an output value of the conditioning circuit board, then inputting +100deg.C on the standard zero resistor, measuring an output value of the conditioning circuit board, and taking the zero resistor into theoretical zero output according to the two groups of input values and output values;
conditioning circuit board output = a zero resistance + b (2)
According to this formula, the core 1 is illustrated in connection with this batch of sensor characteristics: when the zero resistance input is 1909Ω, the output of the conditioning circuit board is 0.254V; when the zero resistance input is 2009Ω, the conditioning circuit board output is 0.297V. Therefore, the relation between the zero resistance and the output voltage of the conditioning circuit board is obtained as follows: v=0.43 Rz-556.87mV
The final combination and calculation result are as follows:
algorithm 2: the conditioning circuit board inputs a standard zero resistor and a standard amplitude resistor, and the relation between the conditioning circuit board zero compensation resistor and the input voltage reference potential is obtained according to a formula by reading the output of the input voltage reference potential under the condition of minimum and maximum reference values and is stored in the database module;
rz=a reference potential+b (3)
After the core body and the conditioning circuit board are combined, the amplitude resistor is input according to the amplitude resistor calculated in the step 4, the zero resistor is input according to the standard zero resistor debugged by the circuit board, the potential of the circuit board O+ and O-can be measured, and then the zero resistor can be obtained according to the formula (3).
Step 6: and connecting the compensation resistor to the conditioning circuit, connecting and combining the conditioning circuit board and the core body according to the combination result to form the pressure sensor, and retesting the pressure sensor.
The retest results are as follows:
according to the repeated measurement result, the deviation of the zero amplitude output of the pressure sensor subjected to the debugging by the method is within 220mV compared with the standard zero amplitude output, the accuracy requirement of the sensor is met, and the purpose of high-low temperature compensation is achieved.
The debugging method of the pressure sensor provided by the embodiment of the invention has the following advantages:
a solution is provided to the problem of conventional pressure sensor debugging. The output characteristics of the sensor core body and the conditioning circuit board at normal temperature, high temperature and low temperature are measured, so that the pressure sensor can be debugged and temperature compensated according to the output size and the accuracy requirement of the sensor, and the utilization rate of the core body and the conditioning circuit board is improved;
the software is utilized to automatically collect, debug and match the data of the core body and the conditioning circuit board of the pressure sensor, so that the pressure sensor is debugged, and the production efficiency and the product precision are improved;
the pressure sensor is debugged by the method, and the front-end processes of the core body and the conditioning circuit board can be guided through certain data accumulation.
While the invention has been described in detail in the general context and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (2)
1. A method of tuning a pressure sensor, the pressure sensor comprising a core and a conditioning circuit board, the method comprising:
step 1: respectively carrying out zero point and amplitude debugging on a plurality of conditioning circuit boards to be tested to obtain a first zero point compensation resistor and a first amplitude compensation resistor corresponding to the plurality of conditioning circuit boards;
step 2: the corresponding first zero compensation resistor and the first amplitude compensation resistor are respectively connected to the circuits of the plurality of conditioning circuit boards, the output voltages of the plurality of conditioning circuit boards to be tested at different temperatures and different input voltages are measured, and the measured output voltage values of the plurality of conditioning circuit boards are stored in a database;
step 3: measuring output voltages of a plurality of cores to be measured under different temperature and different pressure inputs respectively, and storing the measured output voltage values of the cores into the database;
step 4: according to the output voltage values of the conditioning circuit boards and the output voltage values of the cores in the database under the same temperature measurement, the corresponding first to-be-measured conditioning circuit board and the first to-be-measured core are combined, so that the combined output voltage value of the first pressure sensor is within a preset range;
step 5: acquiring a second amplitude compensation resistor of the first conditioning circuit board to be tested according to the combination of the first conditioning circuit board to be tested and the first core to be tested;
step 6: acquiring a second zero compensation resistor of the first conditioning circuit board to be tested according to the combination of the first conditioning circuit board to be tested and the first core to be tested;
step 7: connecting the second amplitude compensation resistor and the second zero compensation resistor to the circuit of the first conditioning circuit board to be tested, and testing the output voltage of the first pressure sensor;
in step 2, the output voltages of the conditioning circuit boards to be tested at different temperatures and different input voltages are measured, specifically: respectively collecting output voltages of the conditioning circuit boards under n input voltages at the first temperature, the second temperature and the third temperature; wherein n is a positive integer, the first temperature is less than the second temperature and greater than the third temperature;
in step 3, measuring output voltages of a plurality of cores to be measured under different temperature and different pressure inputs respectively, specifically: respectively collecting output voltages of the plurality of cores at m input pressures at the first temperature, the second temperature and the third temperature; wherein m is a positive integer; specifically, n is greater than or equal to 6, m is greater than or equal to 6, and n=m;
the step 4 further includes: the unmatched data of the cores to be tested and the conditioning circuits to be tested are stored in the database, and the matching can be performed again after the data of the next batch of products are acquired;
the step 3 is specifically as follows: providing constant excitation current for the plurality of cores to be tested respectively, and collecting output voltages of the plurality of cores to be tested under different pressure outputs;
in step 4, according to the output voltage values of the plurality of conditioning circuit boards and the output voltage values of the plurality of cores in the database under the same temperature measurement, the corresponding first conditioning circuit board to be tested and the first core to be tested are combined, specifically: and carrying out maximum matching combination on the plurality of cores to be detected and the plurality of conditioning circuit boards, wherein the maximum matching combination is realized based on a bipartite graph maximum matching algorithm.
2. A commissioning system for a pressure sensor, the pressure sensor comprising a core and a conditioning circuit board, the commissioning system comprising:
a core body tool (10), wherein a plurality of core bodies to be detected are respectively arranged on the core body tool (10);
a conditioning circuit board tool (20), wherein a plurality of conditioning circuit boards to be tested are respectively arranged on the conditioning circuit board tool (20);
the high-low temperature box (30), the core body tool (10) and the conditioning circuit board tool (20) are respectively arranged in the high-low temperature box (30), and the internal temperature of the high-low temperature box (30) can be regulated and controlled;
the resistor box (40) is respectively connected with the plurality of conditioning circuit boards to be tested, and is used for debugging a first zero compensation resistor and a first amplitude compensation resistor of the plurality of conditioning circuit boards to be tested;
a pressure controller (50) for controlling the amount of pressure applied to the plurality of cores to be measured;
the constant voltage source power supply module (60) is connected with the conditioning circuit board tool (20) and is used for providing constant voltage for the plurality of conditioning circuit boards to be tested;
the constant current source power supply module (70) is connected with the core tool (10) and is used for providing constant current for the plurality of cores to be tested;
the universal meter (80) is used for respectively connecting the corresponding first zero compensation resistor and the first amplitude compensation resistor into the circuits of the plurality of conditioning circuit boards, measuring the output voltages of the plurality of conditioning circuit boards to be measured under different temperatures and different input voltages, and measuring the output voltages of the plurality of cores to be measured under different temperatures and different pressure inputs;
the database module is used for storing the measured output voltage values of the plurality of conditioning circuit boards into a database, and storing the measured output voltage values of the plurality of cores into the database;
the multi-way switch module (90) is used for controlling the communication state of the constant-voltage source power supply module (60) and the conditioning circuit board tool (20) and controlling the communication state of the constant-current source power supply module (70) and the core tool (10);
and the automatic screening module combines the corresponding first to-be-tested conditioning circuit board and the first to-be-tested core body according to the output voltage values of the conditioning circuit boards and the output voltage values of the core bodies in the database under the same temperature measurement, so that the output voltage value of the combined first pressure sensor is in a preset range.
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| CN113203520A (en) | 2021-08-03 |
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