CN104459589A - Automatic test system of current sensor - Google Patents
Automatic test system of current sensor Download PDFInfo
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- CN104459589A CN104459589A CN201310426191.3A CN201310426191A CN104459589A CN 104459589 A CN104459589 A CN 104459589A CN 201310426191 A CN201310426191 A CN 201310426191A CN 104459589 A CN104459589 A CN 104459589A
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Abstract
Embodiments of the invention provide an automatic test system of a current sensor. The system comprises a current generator, a current adjusting controller, a collector, and a host computer. The current generator generates excitation current signals used for testing the current sensor. The current sensor generates test signals according to the excitation current signals. The current adjusting controller adjusts the excitation current signals generated by the current generator according to a control instruction. The collector collects the test signals, and acquires parameters of the current sensor according to the test signals. The host computer is connected with the current adjusting controller and the collector. The host computer sends control instructions to the current adjusting controller, and receives the parameters of the current sensor, so that the current sensor is tested. The parameters of the current sensor are fed back by the collector. The system improves accuracy of tests, reduces mechanical wear degree, and safety of the tested current sensor and the system is ensured.
Description
Technical field
The present invention relates to technical field of measurement and test, particularly a kind of Auto-Test System of current sensor.
Background technology
Current sensor test macro is specifically designed to the serviceability of measuring current sensor, the linearity, precision etc. of such as current sensor, this system mainly comprises power supply, the strong current generator of powering for tested current sensor and obtains the sample circuit that tested current sensor exports.Wherein, strong current generator, for generation of continuous big current, is mainly tested current sensor and provides exciting current signal, this strong current generator mainly comprises three parts, one is control desk, and control desk has rotating shaft, is carried out the size of regulation output exciting current signal by rotating shaft; Two is the devices producing exciting current signal; Three is copper bars that exciting current signal is exported.
Before each test, according to the difference of current sensor model, need to change connected mode manually, select the parameters such as supply voltage, sampling resistor, sampling channel.In testing, also need the control desk rotating strong current generator manually to change the size of output drive current signal.At present, mainly there is following problem: the operation such as (1) wiring manually, regulation voltage, replacing resistance is very loaded down with trivial details, easily makes mistakes, has a strong impact on the judgement to current sensor serviceability; (2) rotate the control desk of strong current generator manually, cause velocity of rotation, moment uneven, the increase making exciting current signal is not linear change, and the accuracy therefore tested is low; (3) mechanical wear of control desk is easily accelerated in manual operation, shortens service life of equipment.
Summary of the invention
Object of the present invention is intended at least solve one of above-mentioned technological deficiency.
For this reason, the object of the invention is to the Auto-Test System proposing a kind of current sensor, this system improves the accuracy of current sensor test, reduce the mechanical wear degree of system.
To achieve these goals, the Auto-Test System of the current sensor of the embodiment of the present invention, comprise current feedback circuit, current regulation control device, collector and host computer, wherein said current feedback circuit generates the exciting current signal of measuring current sensor, wherein, described current sensor exports test signal according to described exciting current signal; Described current regulation control device regulates the described exciting current signal that described current feedback circuit generates according to steering order; Described collector gathers described test signal, and obtains the parameter of described current sensor according to described test signal; And described host computer is connected with described collector respectively with described current regulation control device, described host computer sends described steering order to described current regulation control device, and the parameter of described current sensor receiving described collector feedback is to test described current sensor.
The Auto-Test System of the current sensor of the embodiment of the present invention, at least there is following beneficial effect: (1) system can select supply voltage and sampling resistor automatically, no longer need to change manually, avoid the mistake that manual operation easily brings, it is final more accurate to the judgement of performance of current sensors to make; (2) use the rotation of the control desk of driven by motor current feedback circuit, the electric current of linear change can be produced, improve the accuracy of test, and reduce the mechanical wear degree of system; (3) when the exciting current signal overrate that current feedback circuit exports, overload protection module can be cut off the electricity supply immediately, ensure that the safety of current sensor and system.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the structural representation of the Auto-Test System of current sensor according to an embodiment of the invention;
Fig. 2 is the structural representation of the Auto-Test System of current sensor according to an embodiment of the invention;
Fig. 3 is the structural representation of the Auto-Test System of current sensor according to an embodiment of the invention;
Fig. 4 is the circuit diagram of the voltage selection unit according to the embodiment of the present invention;
Fig. 5 is the circuit diagram of the voltage self-test unit according to the embodiment of the present invention;
Fig. 6 is the circuit diagram of the resistance selection selftest module according to the embodiment of the present invention;
Fig. 7 is the structural representation of the Auto-Test System of current sensor according to an embodiment of the invention;
Fig. 8 is the circuit diagram of the overload protection module according to the embodiment of the present invention;
Fig. 9 is the process flow diagram of the automatic testing process according to the embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Disclosing hereafter provides many different embodiments or example is used for realizing different structure of the present invention.Of the present invention open in order to simplify, hereinafter the parts of specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the present invention.In addition, the present invention can in different example repeat reference numerals and/or letter.This repetition is to simplify and clearly object, itself does not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique that the invention provides and the example of material, but those of ordinary skill in the art can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, fisrt feature described below second feature it " on " structure can comprise the embodiment that the first and second features are formed as directly contact, also can comprise other feature and be formed in embodiment between the first and second features, such first and second features may not be direct contacts.
In describing the invention, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
With reference to description below and accompanying drawing, these and other aspects of embodiments of the invention will be known.Describe at these and in accompanying drawing, specifically disclose some particular implementation in embodiments of the invention, representing some modes of the principle implementing embodiments of the invention, but should be appreciated that the scope of embodiments of the invention is not limited.On the contrary, embodiments of the invention comprise fall into attached claims spirit and intension within the scope of all changes, amendment and equivalent.
In order to improve the accuracy of current sensor serviceability test, reducing the mechanical wear degree of system, the present invention proposes a kind of Auto-Test System of current sensor.The Auto-Test System of the current sensor according to the embodiment of the present invention is described below with reference to Fig. 1 to Fig. 9.
Fig. 1 is the structural representation of the Auto-Test System of current sensor according to an embodiment of the invention.As shown in Figure 1, comprise according to the Auto-Test System of the current sensor of the embodiment of the present invention: current feedback circuit 10, current regulation control device 20, collector 30 and host computer 40.
Particularly, current feedback circuit 10 generates the exciting current signal of measuring current sensor.Particularly, because tested object is current sensor, so must have a continuous current signal outside from tested object as exciting current signal, current sensor responds to this exciting current signal to export corresponding test signal.Wherein, current sensor exports test signal according to exciting current signal.
In addition, current feedback circuit 10 comprises control desk, exciting current signal generating apparatus and copper bar, wherein, exciting current signal generating apparatus is for generating exciting current signal, control desk has rotating shaft, the size of regulation output exciting current signal is carried out, by the exportable exciting current signal of copper bar by rotating shaft.
Current regulation control device 20 regulates the exciting current signal that current feedback circuit 10 generates according to steering order.Particularly, current regulation control device 20 obtains the steering order that host computer 40 sends, and controls current feedback circuit 10 according to this steering order.More specifically, current regulation control device 20 controls the rotating shaft rotating speed, rotational angle etc. of control desk in current feedback circuit 10 according to steering order.Such as, the rotating shaft that current regulation control device 20 can control control desk in current feedback circuit 10 rotates with rated speed, rated moment, because the angular dimension of axis of rotation is directly proportional to the exciting current signal magnitude that current feedback circuit 10 generates, the exciting current signal evenly increasing from zero or reduces from nominal angle just to make current feedback circuit 10 generate of rotational angle is from zero linear increase or linearly reduce from ratings, the linear increase of the exciting current signal generated like this or reduction.Wherein, rotating shaft rotates with specified moment not only can reduce mechanical friction, the extension device life-span, the more important thing is can according to the sampling rate of current sensor, the isoparametric difference of range ability, control rotating shaft and rotate different angles with different rated speeds, thus instead of the operation of rotating shaft manually completely.
Collector 30 collecting test signal, and the parameter obtaining current sensor according to test signal.Particularly, the exciting current signal that current feedback circuit 10 generates inputs to current sensor, current sensor excitation induced current signal thus export corresponding test signal, and collector 30 collecting test signal is to obtain the parameter of current sensor.Such as, exciting current signal is linearly increase from 0 to 20A, and so current sensor then exports the voltage signal of 0 ~ 5V, and this voltage signal reflects corresponding exciting current signal one by one, collector 30 gathers this voltage signal, thus obtains the parameter of current sensor according to the voltage signal gathered.
Host computer 40 is connected with collector 30 respectively with current regulation control device 20, and host computer 40 to current regulation control device 20 sending controling instruction, and receives the parameter of current sensor that collector 30 feeds back to test current sensor.
Particularly, be provided with test procedure in host computer 40, select the model of current sensor after opening test procedure, test procedure then sends to current regulation control device 20 according to this model setup control instruction.In addition, host computer 40 also for receiving the parameter of the current sensor that collector 30 feeds back, thus obtains test data.
The Auto-Test System of the current sensor of the embodiment of the present invention, the exciting current signal of linear change can be generated by automatic control electric flow-generator by current regulation control device, because the exciting current signal acting on current sensor is linear, therefore can obtain current sensor accurately and export test signal, thus improve the accuracy of current sensor test, in addition, current regulation control device is used to control current feedback circuit, substitute manual operation, mechanical friction can be reduced, extension device serviceable life.
Fig. 2 is the structural representation of the Auto-Test System of the current sensor of one embodiment of the invention.
As shown in Figure 2, Auto-Test System according to the current sensor of the embodiment of the present invention comprises: current feedback circuit 10, current regulation control device 20, control module 21, stepper motor 22, collector 30 and host computer 40, wherein, in one embodiment of the invention, current regulation control device 20 comprises control module 21 and stepper motor 22.
Particularly, control module 21 is for according to steering order production burst control signal.More specifically, control module 21 receives the steering order that host computer 40 sends, then stepper motor 22 is sent to according to this steering order production burst control signal, the parameter information controlling current feedback circuit 10 control desk axis of rotation can be comprised, the velocity of rotation, rotational angle etc. of such as rotating shaft in the steering order that control module 21 receives.There is the program write control module 21 inside, and can change steering order into pulse control signal, for control step motor 22.Such as, control module 21 can adopt PLC(Programmable Logic Controller, programmable logic controller (PLC)) realize.
Stepper motor 22 is connected with control module 21, and stepper motor 22 is for controlling the corresponding rotation of rotating shaft in current feedback circuit 10 to regulate exciting current signal according to pulse control signal.
Wherein, stepper motor 22 according to pulse control signal uniform rotation to the angle required, and then rotates backward and gets back to zero point after receiving the pulse control signal that control module 21 sends.Because the rotating shaft of stepper motor 22 with current feedback circuit 10 control desk is connected, so, when stepper motor 22 uniform rotation, current feedback circuit 10 generates one from zero linear increase and continually varying exciting current signal, when exciting current signal increases to ratings, stepper motor 22 rotates backward, and carrying electrical current generator 10 generates from ratings consecutive variations and is linearly decreased to the exciting current signal at zero point.
The Auto-Test System of the current sensor of the embodiment of the present invention, by control module control step motor, precise control, improves accuracy further.
Fig. 3 is the structural representation of the Auto-Test System of the current sensor of one embodiment of the invention.
As shown in Figure 3, comprise according to the Auto-Test System of the current sensor of the embodiment of the present invention: current feedback circuit 10, current regulation control device 20, control module 21, stepper motor 22, collector 30, host computer 40, adjuster 50, voltage select selftest module 51, voltage selection unit 511, voltage self-test unit 512, resistance selection selftest module 52 and control treatment module 53, slave computer 60.Wherein, adjuster 50 comprises voltage selection selftest module 51, resistance selection selftest module 52 and control treatment module 53; Voltage selects selftest module 51 to comprise voltage selection unit 511, voltage self-test unit 512.
In one embodiment of the invention, collector 30 and adjuster 50 are integrated in slave computer 60.Slave computer 60 is for gathering the parameter of current sensor and adjusting supply voltage and the sampling resistor of current sensor.Particularly, adjuster 50 is for adjusting supply voltage and the sampling resistor of current sensor.
Wherein, voltage selects selftest module 51 for selecting the supply voltage supporting with current sensor.
In one embodiment of the invention, voltage selects selftest module 51 to comprise voltage selection unit 511 and voltage self-test unit 512.Particularly, voltage selection unit 511 is for selecting the supply voltage supporting with current sensor, and voltage self-test unit 512 is for carrying out self-inspection according to the supply voltage selected.
Voltage selection unit 511 and the voltage self-test unit 512 of the embodiment of the present invention is described below respectively in detail according to Fig. 4 and Fig. 5.
Fig. 4 is the circuit diagram of the voltage selection unit according to the embodiment of the present invention.As shown in Figure 4, voltage selection unit 511 comprises: first presets power supply V1; Second presets power supply V2; First electric capacity C1, one end ground connection of the first electric capacity C1; The input end of the first driving chip U1, the first driving chip U1 is connected with the other end of the first electric capacity C1; The input end of the second driving chip U2, the second driving chip U2 is connected with the other end of the first electric capacity C1; One end of first diode D1, the first diode D1 is connected with the output terminal of the first driving chip U1, and the other end and second of the first diode D1 is preset power supply V2 and is connected; One end of second diode D2, the second diode D2 is connected with the output terminal of the second driving chip U2, and the other end and second of the second diode D2 is preset power supply V2 and is connected; First relay K 1, one end (label 1) and second of first relay K 1 coil is preset power supply V2 and is connected, the other end (label 2) of the first relay K 1 coil is connected with one end of the first diode D1, first contact (label 3) of the first relay K 1 is connected with the output terminal of voltage selection unit 511, second contact (label 4) of the first relay K 1 is unsettled, and the 3rd contact (label 5) of the first relay K 1 is connected with the first positive pole presetting power supply V1; Second relay K 2, one end (label 6) and second of second relay K 2 coil is preset power supply V2 and is connected, the other end (label 7) of the second relay K 2 coil is connected with one end of the second diode D2, first contact (label 8) of the second relay K 2 is connected with the first negative pole presetting power supply V1, second contact (label 9) of the second relay K 2, the 3rd contact (label 10) of the second relay K 2 is connected with the output terminal of voltage selection unit 511.
Due to the difference of current sensor model, therefore required supply voltage is also different.Fig. 4 is the circuit diagram of the voltage selection unit according to the embodiment of the present invention, for the supply voltage selected according to the model of current sensor.Particularly, 01 end is the output terminal of control treatment module 53, the voltage of 02 end, 03 end can be sent to 05 end, 06 end, namely be sent to the feeder ear of current sensor according to the control signal that control treatment module 53 exports.Wherein, 02 end, 03 end represent the supply voltage from the external world, namely first preset the positive pole (V1+) of power supply V1 and negative pole (V1-).The following describes the principle of work of this circuit, as, when 02 end, 03 termination ± 24V voltage, during 01 end selection high level, high level signal is respectively through the first driving chip U1, second driving chip U2 becomes low level, because the second default power supply V2 is high level, so the first contact of the first relay K 1 (label 3) and the 3rd contact (label 5) are connected, in like manner, first contact (label 8) and the 3rd contact (label 10) of the second relay K 2 are connected, so the voltage of+24V has just been sent to 05 end, the voltage of-24V has just been sent to 06 end, for powering to current sensor.
According to the difference of the model of current sensor, supply voltage has multiple, below with ± 24V, ± 15V, 5V supply voltage is that example illustrates that control treatment module 53 controls selection ± 24V, ± 15V, a principle as the supply voltage of current sensor in 5V voltage, wherein, the output terminal of control treatment module 53 has 3 ports, such as, there are three circuit as shown in Figure 4, wherein, 02 end of first circuit, 03 termination ± 24V voltage, first port of 01 termination control treatment module 53 output terminal, 02 end of second circuit, 03 termination ± 15V voltage, second port of 01 termination control treatment module 53 output terminal, 02 termination 5V voltage of the 3rd circuit, 3rd port of 01 termination control treatment module 53 output terminal.When first port of control treatment module 53 output terminal is high level, when second port and the 3rd port are low level, first circuit working, now the output terminal output ± 24V voltage of circuit; When second port of control treatment module 53 output terminal is high level, when first port and the 3rd port are low level, second circuit working, now the output terminal output ± 24V voltage of circuit; When the 3rd port of control treatment module 53 output terminal is high level, when first port and second port are low level, the 3rd circuit working, now the output terminal of circuit exports 5V voltage.So just achieve the selection of supply voltage, thus achieve the function automatically selecting supply voltage according to current sensor model.Recited above ± 24V, ± 15V, 5V voltage are only used to illustrate and realize automatically selecting the original of supply voltage, and the circuit number shown in kind, number and Fig. 4 that this is not used in supply voltage limits.
Fig. 5 is the circuit diagram of the voltage self-test unit according to the embodiment of the present invention.As shown in Figure 5, voltage self-test unit 512 comprises: the first resistance R1, and one end of the first resistance R1 is connected with output terminal 05 positive pole of voltage selection unit 511; One end of second resistance R2, the second resistance R2 is connected with the other end of the first resistance R1, the other end ground connection of the second resistance R2; 3rd resistance R3, one end ground connection of the 3rd resistance R3; 4th R4 resistance, one end of the 4th resistance R4 is connected with the other end of the 3rd resistance R3, and the other end of the 4th resistance R4 is connected with output terminal 06 negative pole of voltage selection unit 511; Second electric capacity C2, the second electric capacity C2 is in parallel with the second resistance R2; 3rd electric capacity C3, the 3rd electric capacity C3 is in parallel with the 3rd resistance R3; The input end in the same way of the first operational amplifier UA1, the first operational amplifier UA1 is connected with the output terminal 08 of the first operational amplifier UA1, and the reverse input end of the first operational amplifier UA1 is connected with the other end of the 3rd resistance R3.
In one embodiment of the invention, in test process, supply voltage loose contact or damage may be there is, so can cause the situation that supply voltage instability or no-voltage are powered, so need to check the supply voltage chosen.The function of circuit diagram is as shown in Figure 5 check the supply voltage chosen, 05 end, 06 end represent positive pole and the negative pole of the supply voltage chosen, this voltage acts on 07 end by the dividing potential drop of illustrated circuit and 08 end produces fixed-size voltage, the magnitude of voltage between 07 end and 08 end is gathered by control treatment module 53, and compare with the current theoretical voltage value that should power, send to host computer 40 to process after obtaining a result.
Resistance selection selftest module 52 is for selecting the sampling resistor supporting with current sensor.Fig. 6 is the circuit diagram of the resistance selection selftest module according to the embodiment of the present invention, and as shown in Figure 6, resistance selection selftest module 52 comprises second and presets power supply V2; 3rd presets power supply V3; 4th presets power supply V4; 4th electric capacity C4, one end ground connection of the 4th electric capacity C4; 5th electric capacity C5, one end ground connection of the 5th electric capacity C5; 6th electric capacity C6, one end ground connection of the 6th electric capacity C6; The input end of the 3rd driving chip U3, the 3rd driving chip U3 is connected with the other end of the 4th electric capacity C4; The input end of four-wheel drive chip U4, four-wheel drive chip U4 is connected with the other end of the 5th electric capacity C5; The input end of the 5th driving chip U5, the 5th driving chip U5 is connected with the other end of the 6th electric capacity C6; One end of 3rd diode D3, the 3rd diode D3 is connected with the output terminal of the 3rd driving chip U3, and the other end and second of the 3rd diode D3 is preset power supply V2 and is connected; 3rd relay K 3, one end (label 1) of 3rd relay K 3 coil is connected with the other end of the 3rd diode D3, the other end (label 2) of the 3rd relay K 3 coil is connected with one end of the 3rd diode D3, and second contact (label 4) and the 3rd of the 3rd relay K 3 is preset power supply V3 and is connected; 4th diode D4, one end of the 4th diode D4 is connected with the output terminal of four-wheel drive chip U4, and the other end and second of the 4th diode D4 is preset power supply V2 and is connected; 5th resistance R5, one end ground connection of the 5th resistance R5; 4th relay K 4, one end (label 6) of 4th relay K 4 coil is connected with the other end of the 4th diode D4, the other end (label 7) of the 4th relay K 4 coil is connected with one end of the 4th diode D4, second contact (label 9) of the 4th relay K 4 is by the 5th resistance R5 ground connection, and the 3rd contact (label 10) of the 4th relay K 4 is connected with first contact (label 3) of the 3rd relay K 3; One end and the 4th of 6th resistance R6, the 6th resistance R6 is preset power supply V4 and is connected; One end and the 4th of 7th resistance R7, the 7th resistance R7 is preset power supply V4 and is connected, and the other end of the 7th resistance R7 is connected with the 3rd contact (label 5) of the 3rd relay K 3; One end of 8th resistance R8, the 8th resistance R8 is connected with the other end of the 7th resistance R7; One end of 9th resistance R9, the 9th resistance R9 is connected with the other end of the 6th resistance R6, the other end ground connection of the 9th resistance R9; The input end in the same way of the second operational amplifier UA2, the second operational amplifier UA2 is connected with the other end of the 6th resistance R6, and the reverse input end of the second operational amplifier UA2 is connected with the other end of the 8th resistance R8; One end of tenth resistance R10, the tenth resistance R10 is connected with the reverse input end of the second operational amplifier UA2, and the other end of the tenth resistance R10 is connected with the output terminal of the second operational amplifier UA2; One end of 11 resistance R11, the 11 resistance R11 is connected with first contact (label 8) of the 4th relay K 4; 12 resistance R12, one end of the 12 resistance R12 is connected with the other end of the 11 resistance R11, the other end ground connection of the 12 resistance R12; One end of 5th diode D5, the 5th diode D5 is connected with the output terminal of the 5th driving chip U5, and the other end and second of the 5th diode D5 is preset power supply V2 and is connected; 5th relay K 5, one end (label 1) of 5th relay K 5 coil is connected with the other end of the 5th diode D5, the other end (label 2) of the 5th relay K 5 coil is connected with one end of the 5th diode D5, first contact (label 3) ground connection of the 5th relay K 5, second contact (label 4) of the 5th relay K 5 is unsettled, and the 3rd contact (label 5) of the 5th relay K 5 is connected with one end of the 12 resistance R12; Second contact (label 9) of the 6th relay K the 6, six relay K 6 is unsettled, the 3rd contact (label 10) ground connection of the 6th relay K 6.
In one embodiment of the invention, as shown in Figure 6, below for the principle selecting the resistance of 20 Ω or 40 Ω that resistance selection selftest module circuit is described.09 end represents fixing output voltage, such as a 5V, and 10 ends, 11 ends, 12 ends are connected with control treatment module 53 output port, and 14 ends, 15 ends, 16 ends represent signal output part, and 13 ends represent relay K 5 and K6.Such as, first require that 11 ends give high level, now first contact (label 8) of the 4th relay K 4 is connected with the 3rd contact (label 10), thus the output signal of current sensor is passed to 14 ends, 15 ends from 09 end, can be collected by control processing module 53.When 12 ends give low level, 11 resistance R11 and the 12 resistance R12 connects, voltage now on the 11 resistance R11 is the half of the upper voltage summation of R11, R12, and the voltage that therefore 14 ends, 15 ends are collected is the half of current output, and the sampling resistor be namely equivalent to now is 20 Ω; When 12 ends give high level, first contact (label 3) of the 5th relay K 5 is connected with the 3rd contact (label 5), now the 12 resistance R12 is by short circuit, therefore from 09 end voltage drop on the 11 resistance R11 two ends, so sampling resistor is 40 Ω.In addition, this circuit produces a definite value electric current at 16 end places, control treatment module 53 gathers this electric current, again except the voltage of 14 ends, 15 ends, just a resistance value is obtained, by the resistance value ratio of this resistance value and selected sampling resistor comparatively, if consistent, illustrate the correct and circuit of the sampling resistor of current selection connect normal, without the damage of components and parts.
Control treatment module 53 selects selftest module 51 to be connected with resistance selection selftest module 52 with voltage respectively, adjusts supply voltage and sampling resistor for the parameter adjustment instruction according to host computer 40.
Particularly, in one embodiment of the invention, control treatment module 53 is for selecting selftest module 51 and resistance selection selftest module 52 automatically to select supply voltage and the sampling resistor of current sensor according to the parameter adjustment instruction control voltage of host computer 40, after supply voltage and sampling resistor are selected, control treatment module 53 is also for the resistance of the numerical value and sampling resistor that gather supply voltage, and compare with the theoretical value of sampling resistor with supply voltage in parameter adjustment instruction, judge the supply voltage that chosen and sampling resistor whether correct.
Fig. 7 is the structural representation of the Auto-Test System of the current sensor of one embodiment of the invention.
As shown in Figure 7, comprise according to the Auto-Test System of the current sensor of the embodiment of the present invention: current feedback circuit 10, current regulation control device 20, control module 21, stepper motor 22, collector 30, host computer 40, adjuster 50, voltage select selftest module 51, voltage selection unit 511, voltage self-test unit 512, resistance selection selftest module 52, control treatment module 53, slave computer 60 and overload protection module 70.
Wherein, overload protection module 70, for when exciting current signal overrate, is cut off the electricity supply with protective current sensor.
Particularly, in one embodiment of the invention, control module 21 and stepper motor 22 control current feedback circuit 10 and generate exciting current signal, due to host computer 40, rely on test procedure to realize controlling between control module 21 and stepper motor 22, so situation about flying may be run by generating program, thus the phenomenon causing control step motor 22 malfunctioning, when the exciting current signal overrate that stepper motor 22 carrying electrical current generator 10 generates, the copper bar of current feedback circuit 10 will generate heat, burn out current sensor and copper bar, so the temperature by being placed in the temperature sensor Real-Time Monitoring copper bar on copper bar, when temperature exceedes critical value, the protection circuit of overload protection module 70 can be cut off the electricity supply immediately with protective current sensor.
More specifically, Fig. 8 is the circuit diagram of the overload protection module according to the embodiment of the present invention.As shown in Figure 8, overload protection module 70 comprises: temperature sensor T1, and temperature sensor T1 is connected with current feedback circuit 10; 5th presets power supply V5; One end and the 5th of 13 resistance R13, the 13 resistance R13 is preset power supply V5 and is connected; 14 resistance R14, one end ground connection of the 14 resistance R14; 7th electric capacity C7, one end of the 7th electric capacity C7 is connected with the other end of the 13 resistance R13; 15 resistance 15, one end and the 5th of the 15 resistance R15 is preset power supply V5 and is connected; 16 resistance R16, one end of the 16 resistance R16 is connected with the other end of the 15 resistance R15; 8th electric capacity C8, one end of the 8th electric capacity C8 is connected with the other end of the 15 resistance R5, the other end ground connection of the 8th electric capacity C8; 17 resistance R17, one end of the 17 resistance R17 is connected with the other end of the 15 resistance R15; One end of 18 resistance R18, the 18 resistance R18 is connected with the other end of shown 13 resistance R13; 19 resistance R19, one end of the 19 resistance R19 is connected with the other end of the 17 resistance R17, the other end ground connection of the 19 resistance R19; 3rd operational amplifier UA3, the input end in the same way of the 3rd operational amplifier UA3 is connected with the other end of the 17 resistance R17, and the reverse input end of the 3rd operational amplifier UA3 is connected with the other end of the 18 resistance R18; One end of 20 resistance R20, the 20 resistance R20 is connected with the reverse input end of the 3rd operational amplifier UA3, and the other end of the 20 resistance R20 is connected with the output terminal of the 3rd operational amplifier UA3.
In one embodiment of the invention, as shown in Figure 8, temperature sensor T1 is connected with current feedback circuit 10, the temperature of copper bar in Real-Time Monitoring current feedback circuit 10, the output terminal of temperature sensor T1 and 17 ends, 18 ends are connected, the output signal reflection copper bar temperature of temperature sensor T1, this output signal is sent to 19 ends through circuit shown in Fig. 8, the preset value of signal also and in control treatment module 53 of control treatment module 53 Real-time Collection 19 end compares, when exciting current signal overrate, namely when the signal numerical value of 19 ends exceedes the preset value in control treatment module 53, control treatment module 53 can be cut off the electricity supply immediately, such as pilot relay deenergization can be passed through, with the safety of protective current sensor and whole test macro.
The Auto-Test System of the current sensor of the embodiment of the present invention, at least there is following beneficial effect: (1) system can select supply voltage and sampling resistor automatically, no longer need to change manually, avoid the mistake that manual operation easily brings, it is final more accurate to the judgement of performance of current sensors to make; (2) use the rotation of the control desk of stepper motor carrying electrical current generator, the electric current of linear change can be produced, improve the accuracy of test, and reduce the mechanical wear degree of system; (3) when the exciting current signal overrate that current feedback circuit exports, overload protection module can be cut off the electricity supply immediately, ensure that the safety of current sensor and system.
The process of the Auto-Test System measuring current sensor using current sensor is described below in detail.
Fig. 9 is the process flow diagram of the automatic testing process according to the embodiment of the present invention.As shown in Figure 9, the process of the Auto-Test System measuring current sensor of current sensor is used to be specially:
(1) first manually complete preliminary work, comprise the general supply opening whole system, current sensor is penetrated in the copper bar of testboard bay successively, and lock.
(2) open the test procedure of host computer, select the model of current sensor, hit testing button starts.
(3) supply voltage required when current sensor is tested by host computer, sampling resistor parameter are sent to the control treatment module of adjuster, control treatment module exports corresponding level signal according to parameter information and comes control voltage selection selftest module and resistance selection selftest module, select supply voltage and sampling resistor, then the value collection of the supply voltage chosen and sampling resistor is calculated, judge whether that the parameter value sent with host computer is consistent, if inconsistent, stop test.So just can realize the function automatically selecting supply voltage and sampling resistor, without the need to manual operation.
(4) when above-mentioned judgement is consistent, host computer starting current generator self-inspection.First a self-check program of host computer starting current generator.Mainly in order to check whether the rotating shaft of current feedback circuit control desk has got back to zero point, namely whether exciting current signal is zero.If non-vanishing, suspend and test and press reset key, make stepper motor drive rotating shaft to get back to zero point.
(5) current feedback circuit self-inspection qualified after, the control module of host computer and current regulation control device connects.Because the Full-span output of the current sensor of different model is different, so the parameter such as sampling number, maximum excitation current signal needed during test is also different, this just requires that stepper motor rotates different angles according to different models with different speed, so tester is after upper computer selecting has got well the model of current sensor, host computer internal processes has just set the parameter information such as velocity of rotation and rotational angle and parameter information has been sent to the control module of current regulation control device.After control module receives parameter information, parameter information is converted to pulse control signal and carry out control step electric machine rotation.
(6) after stepper motor receives the pulse control signal from control module, stepper motor will rotate according to pulse control signal, and such as, stepper motor uniform rotation to the angle required, then rotates back into zero point.
(7) rotating shaft of current feedback circuit control desk is connected by shaft coupling with stepper motor, and when therefore stepper motor rotates, current feedback circuit will generate one from zero linear increase and continually varying exciting current signal.When exciting current signal increases to ratings, stepper motor will rotate backward, and exciting current signal will stop after ratings is linearly decreased to zero point.By the automatic rotation control system of host computer, control module, stepper motor composition, current sensor just can sense the exciting current signal of change automatically, thus do not need the rotating shaft of manually rotating control desk to change exciting current signal, achieve automatic control.
(8) owing to being all rely on test procedure to control between host computer, control module, stepper motor, so may occur that program fleet situation occurs, the phenomenon that control step motor is malfunctioning is caused.When the exciting current signal overrate that stepper motor rotating band streaming current generator produces, copper bar will generate heat, and burns out current sensor and copper bar.So overload protection module is by temperature sensor Real-Time Monitoring copper bar temperature, and control treatment module communication that is real-time and adjuster, when occurring abnormal, power-off immediately stops, thus can realize the function of protective current sensor and system automatically all the time.
(9) when the exciting current signal that current feedback circuit produces is normal, current sensor to respond to from zero point to full scale (i.e. ratings) again after the exciting current signal at zero point, export complete test data, collector collects this test data and is sent to host computer, host computer automatic decision store test data, now just complete the automatic test of current sensor by the Auto-Test System of current sensor.
Describe and can be understood in process flow diagram or in this any process otherwise described or method, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by embodiments of the invention person of ordinary skill in the field.
In flow charts represent or in this logic otherwise described and/or step, such as, the sequencing list of the executable instruction for realizing logic function can be considered to, may be embodied in any computer-readable medium, for instruction execution system, device or equipment (as computer based system, comprise the system of processor or other can from instruction execution system, device or equipment instruction fetch and perform the system of instruction) use, or to use in conjunction with these instruction execution systems, device or equipment.With regard to this instructions, " computer-readable medium " can be anyly can to comprise, store, communicate, propagate or transmission procedure for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically (non-exhaustive list) of computer-readable medium comprises following: the electrical connection section (electronic installation) with one or more wiring, portable computer diskette box (magnetic device), random-access memory (ram), ROM (read-only memory) (ROM), erasablely edit ROM (read-only memory) (EPROM or flash memory), fiber device, and portable optic disk ROM (read-only memory) (CDROM).In addition, computer-readable medium can be even paper or other suitable media that can print described program thereon, because can such as by carrying out optical scanning to paper or other media, then carry out editing, decipher or carry out process with other suitable methods if desired and electronically obtain described program, be then stored in computer memory.
Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple step or method can with to store in memory and the software performed by suitable instruction execution system or firmware realize.Such as, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: the discrete logic with the logic gates for realizing logic function to data-signal, there is the special IC of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, this program perform time, step comprising embodiment of the method one or a combination set of.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing module, also can be that the independent physics of unit exists, also can be integrated in a module by two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.If described integrated module using the form of software function module realize and as independently production marketing or use time, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium mentioned can be ROM (read-only memory), disk or CD etc.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.
Claims (11)
1. an Auto-Test System for current sensor, is characterized in that, comprising:
Current feedback circuit, described current feedback circuit generates the exciting current signal of measuring current sensor, and wherein, described current sensor exports test signal according to described exciting current signal;
Current regulation control device, described current regulation control device regulates the described exciting current signal that described current feedback circuit generates according to steering order;
Collector, described collector gathers described test signal, and obtains the parameter of described current sensor according to described test signal; And
Host computer, described host computer is connected with described collector respectively with described current regulation control device, described host computer sends described steering order to described current regulation control device, and the parameter of described current sensor receiving described collector feedback is to test described current sensor.
2. the Auto-Test System of current sensor as claimed in claim 1, it is characterized in that, described current regulation control device comprises further:
Control module, described control module is according to described steering order production burst control signal; And
Stepper motor, described stepper motor is connected with described control module, and described stepper motor controls the corresponding rotation of rotating shaft in described current sensor to regulate described exciting current signal according to described pulse control signal.
3. the Auto-Test System of current sensor as claimed in claim 1 or 2, is characterized in that, also comprise:
Adjuster, described adjuster is for adjusting supply voltage and the sampling resistor of described current sensor.
4. the Auto-Test System of current sensor as claimed in claim 3, it is characterized in that, described adjuster comprises:
Voltage selects selftest module, for selecting the supply voltage supporting with described current sensor;
Resistance selection selftest module, for selecting the sampling resistor supporting with described current sensor;
Control treatment module, described control treatment module selects selftest module to be connected with described resistance selection selftest module respectively with described voltage, adjust described supply voltage and sampling resistor for the parameter adjustment instruction according to described host computer.
5. the Auto-Test System of current sensor as claimed in claim 1, is characterized in that, also comprise:
Overload protection module, for when described exciting current signal overrate, cuts off the electricity supply to protect described current sensor.
6. the Auto-Test System of current sensor as claimed in claim 4, it is characterized in that, described adjuster and described collector are integrated in slave computer.
7. the Auto-Test System of current sensor as claimed in claim 4, is characterized in that, described voltage selects selftest module to comprise further:
Voltage selection unit, for selecting the supply voltage supporting with described current sensor;
Voltage self-test unit, for carrying out self-inspection according to the described supply voltage selected.
8. the Auto-Test System of current sensor as claimed in claim 7, it is characterized in that, described voltage selection unit comprises:
First presets power supply;
Second presets power supply;
First electric capacity, one end ground connection of described first electric capacity;
First driving chip, the input end of described first driving chip is connected with the other end of described first electric capacity;
Second driving chip, the input end of described second driving chip is connected with the other end of described first electric capacity;
First diode, one end of described first diode is connected with the output terminal of described first driving chip, and the other end and described second of described first diode is preset power supply and is connected;
Second diode, one end of described second diode is connected with the output terminal of described second driving chip, and the other end and described second of described second diode is preset power supply and is connected;
First relay, one end and described second of described first relay coil is preset power supply and is connected, the other end of described first relay coil is connected with one end of described first diode, first contact of described first relay is connected with the output terminal of described voltage selection unit, second contact of described first relay is unsettled, and the 3rd contact of described first relay is connected with the described first positive pole presetting power supply;
Second relay, one end and described second of described second relay coil is preset power supply and is connected, the other end of described second relay coil is connected with one end of described second diode, first contact of described second relay is connected with the described first negative pole presetting power supply, second contact of described second relay is unsettled, and the 3rd contact of described second relay is connected with the output terminal of described voltage selection unit.
9. the Auto-Test System of current sensor as claimed in claim 7, it is characterized in that, described voltage self-test unit comprises:
First resistance, one end of described first resistance is connected with the output head anode of described voltage selection unit;
Second resistance, one end of described second resistance is connected with the other end of described first resistance, the other end ground connection of described second resistance;
3rd resistance, one end ground connection of described 3rd resistance;
4th resistance, one end of described 4th resistance is connected with the other end of described 3rd resistance, and the other end of described 4th resistance is connected with the negative pole of output end of described voltage selection unit;
Second electric capacity, described second electric capacity and described second resistor coupled in parallel;
3rd electric capacity, described 3rd electric capacity and described 3rd resistor coupled in parallel;
First operational amplifier, the input end in the same way of described first operational amplifier is connected with the output terminal of described first operational amplifier, and the reverse input end of described first operational amplifier is connected with the other end of described 3rd resistance.
10. the Auto-Test System of current sensor as claimed in claim 4, it is characterized in that, described resistance selection selftest module comprises further:
Second presets power supply;
3rd presets power supply;
4th presets power supply;
4th electric capacity, one end ground connection of described 4th electric capacity;
5th electric capacity, one end ground connection of described 5th electric capacity;
6th electric capacity, one end ground connection of described 6th electric capacity;
3rd driving chip, the input end of described 3rd driving chip is connected with the other end of described 4th electric capacity;
Four-wheel drive chip, the input end of described four-wheel drive chip is connected with the other end of described 5th electric capacity;
5th driving chip, the input end of described 5th driving chip is connected with the other end of described 6th electric capacity;
3rd diode, one end of described 3rd diode is connected with the output terminal of described 3rd driving chip, and the other end and described second of described 3rd diode is preset power supply and is connected;
3rd relay, one end of described 3rd relay coil is connected with the other end of described 3rd diode, the other end of described 3rd relay coil is connected with one end of described 3rd diode, and second contact and the described 3rd of described 3rd relay is preset power supply and is connected;
4th diode, one end of described 4th diode is connected with the output terminal of described four-wheel drive chip, and the other end and described second of described 4th diode is preset power supply and is connected;
5th resistance, one end ground connection of described 5th resistance;
4th relay, one end of described 4th relay coil is connected with the other end of described 4th diode, the other end of described 4th relay coil is connected with one end of described 4th diode, second contact of described 4th relay is by described 5th resistance eutral grounding, and the 3rd contact of described 4th relay is connected with the first contact of described 3rd relay;
6th resistance, one end and the described 4th of described 6th resistance is preset power supply and is connected;
7th resistance, one end and the described 4th of described 7th resistance is preset power supply and is connected, and the other end of described 7th resistance is connected with the 3rd contact of described 3rd relay;
8th resistance, one end of described 8th resistance is connected with the other end of described 7th resistance;
9th resistance, one end of described 9th resistance is connected with the other end of described 6th resistance, the other end ground connection of described 9th resistance;
Second operational amplifier, the input end in the same way of described second operational amplifier is connected with the other end of described 6th resistance, and the reverse input end of described second operational amplifier is connected with the other end of described 8th resistance;
Tenth resistance, one end of described tenth resistance is connected with the reverse input end of described second operational amplifier, and the other end of described tenth resistance is connected with the output terminal of described second operational amplifier;
11 resistance, one end of described 11 resistance is connected with the first contact of described 4th relay;
12 resistance, one end of described 12 resistance is connected with the other end of described 11 resistance, the other end ground connection of described 12 resistance;
5th diode, one end of described 5th diode is connected with the output terminal of described 5th driving chip, and the other end and described second of described 5th diode is preset power supply and is connected;
5th relay, one end of described 5th relay coil is connected with the other end of described 5th diode, the other end of described 5th relay coil is connected with one end of described 5th diode, first contact ground of described 5th relay, second contact of described 5th relay is unsettled, and the 3rd contact of described 5th relay is connected with one end of described 12 resistance;
6th relay, the second contact of described 6th relay is unsettled, the 3rd contact ground of described 6th relay.
The Auto-Test System of 11. current sensors as claimed in claim 5, it is characterized in that, described overload protection module comprises further:
Temperature sensor, described temperature sensor is connected with current feedback circuit;
5th presets power supply;
13 resistance, one end and the described 5th of described 13 resistance is preset power supply and is connected;
14 resistance, one end ground connection of described 14 resistance;
7th electric capacity, one end of described 7th electric capacity is connected with the other end of described 13 resistance;
15 resistance, one end and the described 5th of described 15 resistance is preset power supply and is connected;
16 resistance, one end of described 16 resistance is connected with the other end of described 15 resistance;
8th electric capacity, one end of described 8th electric capacity is connected with the other end of described 15 resistance, the other end ground connection of described 8th electric capacity;
17 resistance, one end of described 17 resistance is connected with the other end of described 15 resistance;
18 resistance, one end of described 18 resistance is connected with the other end of shown 13 resistance;
19 resistance, one end of described 19 resistance is connected with the other end of described 17 resistance, the other end ground connection of described 19 resistance;
3rd operational amplifier, the input end in the same way of described 3rd operational amplifier is connected with the other end of described 17 resistance, and the reverse input end of described 3rd operational amplifier is connected with the other end of described 18 resistance;
20 resistance, one end of described 20 resistance is connected with the reverse input end of described 3rd operational amplifier, and the other end of described 20 resistance is connected with the output terminal of described 3rd operational amplifier.
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