CN217060480U - Current sensor calibration device - Google Patents
Current sensor calibration device Download PDFInfo
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- CN217060480U CN217060480U CN202123189255.1U CN202123189255U CN217060480U CN 217060480 U CN217060480 U CN 217060480U CN 202123189255 U CN202123189255 U CN 202123189255U CN 217060480 U CN217060480 U CN 217060480U
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Abstract
The utility model discloses a current sensor calibrating device for calibration current sensor, including constant current source and calibration frock board, constant current source and current sensor respectively with calibration frock board communication is connected, the constant current source passes through the electric wire and is connected with current sensor's collection jogged joint, calibration frock board includes processing circuit, constant current source communication circuit, voltage stabilizing circuit, opens and stops circuit and warning circuit. The utility model discloses a current sensor calibrating device calibrates circuit sensor through the linkage of calibration frock board and constant current source to make current sensor's accuracy obtain improving.
Description
Technical Field
The utility model belongs to the technical field of the current sensor calibration, concretely relates to current sensor calibrating device.
Background
In the production process of the fluxgate current sensor, due to the influence of the residual magnetic field of the magnetic core, the zero point current without external test current changes corresponding to the magnetic field intensity, meanwhile, the magnetic poles of the magnetic core are in a disordered state, namely, the magnetic poles of the magnetic powder inside have respective directions, if an external magnetic field in one direction is applied, a part of the magnetic field intensity is consumed to change the disordered state, so that the signal measurement error which is closer to the zero point is larger when small signal measurement is carried out, and the magnetic field is increased along with the increase of the external current, the characteristic of the increase following is nonlinear, even if the current with the same size is applied, the generated magnetic field intensity and the generated signal size are also inconsistent under different magnetic cores and amplifying circuits, and therefore, the calibration of the zero point and the calibration of the gain are carried out on each product individual; usually, a fixed test current is applied by a production line debugger by controlling a gain resistor of the signal amplifier and a zero bias, and then the output quantity is made to reach a specified fixed value by adjusting the gain resistor. The method has long debugging process time and needs experienced debugging personnel to debug. Is highly dependent on the skill level of the commissioning personnel. When the yield requirement is high, the number of debugging personnel is difficult to keep up.
Therefore, the above problems are further improved.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a current sensor calibration apparatus, which calibrates a circuit sensor through the linkage of a calibration tooling plate and a constant current source, so that the accuracy of the current sensor is improved.
A primary object of the present invention is to provide a current sensor calibration device, which has the advantages of convenient use, high efficiency and high precision.
To achieve the above object, the present invention provides a calibration device for a current sensor, for calibrating the current sensor, comprising a constant current source and a calibration tooling plate, the constant current source and the current sensor being respectively connected to the calibration tooling plate in a communication manner, the constant current source being connected to a collecting hole of the current sensor through a wire (so that a current passing through the wire is detected by the current sensor), wherein,
the calibration tooling plate comprises a processing circuit, a constant current source communication circuit, a voltage stabilizing circuit, a start-stop circuit and a reminding circuit, wherein the constant current source communication circuit, the voltage stabilizing circuit, the start-stop circuit and the reminding circuit are respectively and electrically connected with the processing circuit.
As a further preferable technical solution of the above technical solution, the processing circuit includes a processor U3, and the constant current source communication circuit includes a communicator U5, wherein:
the 1 pin of the communicator U5 is electrically connected with the 22 pin of the processor U3, the 2 pin (electrically connected with the 3 pin) of the communicator U5 is electrically connected with the 25 pin of the processor U3, the 4 pin of the communicator U5 is electrically connected with the 21 pin of the processor U3, a resistor R15 is connected between the 7 pin and the 6 pin of the communicator U5, one end of the resistor R15, which is close to the 7 pin of the communicator U5, is grounded through a capacitor C17, two ends of the capacitor C17 are connected with a voltage regulator ZD1 in parallel, one end of the resistor R15, which is close to the 6 pin of the communicator U5, is grounded through a capacitor C21, and two ends of the capacitor C21 are connected with a voltage regulator ZD2 in parallel.
As a further preferable technical solution of the above technical solution, the start-stop circuit includes a switch K1 and a switch K2, wherein:
one end of the switch K1 is grounded, the other end of the switch K1 is grounded through a capacitor C15, and one end of the switch K1 close to the capacitor C15 is electrically connected with the 18 pin of the processor U3;
one end of the switch K2 is grounded, the other end of the switch K2 is grounded through a capacitor C16, and one end of the switch K2, which is close to the capacitor C16, is electrically connected to the 20-pin of the processor U3.
As a further preferable technical solution of the above technical solution, the reminding circuit includes a transistor Q1, a collector of the transistor Q1 is electrically connected to one end of the buzzer LS1 through a resistor R16, a resistor R18 is connected between a base and an emitter of the transistor Q1, and the base of the transistor Q1 is electrically connected to the pin 44 of the processor U3 through a resistor R17.
As a further preferable technical solution of the above technical solution, the power supply circuit includes a voltage regulator U2, an operational amplifier U1A, and an operational amplifier U1B, wherein:
the input end of the voltage stabilizer U2 is connected with an input power supply (preferably 9V), the output end of the voltage stabilizer U2 is connected with a first output power supply (preferably 5V), the positive input end of the operational amplifier U1A is connected with a first output end unit through a resistor R2, the output end of the operational amplifier U1A is connected with a second output power supply (VREF), the second output power supply is electrically connected with the positive input end of the operational amplifier U1B, and the output end of the operational amplifier U1B is connected with a third output power supply (REF).
Drawings
Fig. 1 is a schematic structural diagram of the current sensor calibration apparatus of the present invention.
Fig. 2 is a processing circuit diagram of the current sensor calibration apparatus of the present invention.
Fig. 3 is a constant current source communication circuit diagram of the current sensor calibration device of the present invention.
Fig. 4 is a voltage stabilizing circuit diagram of the current sensor calibration apparatus of the present invention.
Fig. 5 is a circuit diagram illustrating the start and stop of the current sensor calibration apparatus of the present invention.
Fig. 6 is a circuit diagram of the current sensor calibration apparatus of the present invention.
Fig. 7 is a circuit diagram of the current sensor calibration apparatus of the present invention.
Detailed Description
The following description is provided to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments described below are by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.
The utility model discloses a current sensor calibrating device combines preferred embodiment below, further describes utility model's embodiment.
In the embodiments of the present invention, those skilled in the art will note that the current sensor, the constant current source, and the like according to the present invention can be regarded as the prior art.
Preferred embodiments.
The utility model discloses a current sensor calibration device, which is used for calibrating a current sensor and comprises a constant current source and a calibration tool plate, wherein the constant current source and the current sensor are respectively in communication connection with the calibration tool plate, the constant current source is connected with a collecting hole of the current sensor through an electric wire (so that the current passing through the electric wire is detected by the current sensor), wherein,
the calibration tooling plate comprises a processing circuit, a constant current source communication circuit, a voltage stabilizing circuit, a start-stop circuit and a reminding circuit, wherein the constant current source communication circuit, the voltage stabilizing circuit, the start-stop circuit and the reminding circuit are respectively and electrically connected with the processing circuit.
Specifically, the processing circuit includes a processor U3, and the constant current source communication circuit includes a communicator U5, wherein:
the 1 pin of the communicator U5 is electrically connected with the 22 pin of the processor U3, the 2 pin (electrically connected with the 3 pin) of the communicator U5 is electrically connected with the 25 pin of the processor U3, the 4 pin of the communicator U5 is electrically connected with the 21 pin of the processor U3, a resistor R15 is connected between the 7 pin and the 6 pin of the communicator U5, one end of the resistor R15, which is close to the 7 pin of the communicator U5, is grounded through a capacitor C17, two ends of the capacitor C17 are connected with a voltage regulator ZD1 in parallel, one end of the resistor R15, which is close to the 6 pin of the communicator U5, is grounded through a capacitor C21, and two ends of the capacitor C21 are connected with a voltage regulator ZD2 in parallel.
It should be noted that the constant current source communication circuit further includes a connection unit CN4, the 1 pin of the connection unit CN4 is electrically connected to the 6 pin of the communicator U5, and the 2 pin of the connection unit CN4 is electrically connected to the 7 pin of the communicator U5.
More specifically, the start-stop circuit includes a switch K1 and a switch K2, wherein:
one end of the switch K1 is grounded, the other end of the switch K1 is grounded through a capacitor C15, and one end of the switch K1, which is close to the capacitor C15, is electrically connected to the 18 pin of the processor U3;
one end of the switch K2 is grounded, the other end of the switch K2 is grounded through a capacitor C16, and one end of the switch K2 close to the capacitor C16 is electrically connected to the 20 pin of the processor U3.
Further, the reminding circuit comprises a triode Q1, a collector of the triode Q1 is electrically connected with one end of a buzzer LS1 through a resistor R16, a resistor R18 is connected between a base and an emitter of the triode Q1, and the base of the triode Q1 is electrically connected with a pin 44 of the processor U3 through a resistor R17.
Further, the power circuit comprises a voltage regulator U2, an operational amplifier U1A, and an operational amplifier U1B, wherein:
the input end of the voltage stabilizer U2 is connected with an input power supply (preferably 9V), the output end of the voltage stabilizer U2 is connected with a first output power supply (preferably 5V), the positive input end of the operational amplifier U1A is connected with a first output end unit through a resistor R2, the output end of the operational amplifier U1A is connected with a second output power supply (VREF), the second output power supply is electrically connected with the positive input end of the operational amplifier U1B, and the output end of the operational amplifier U1B is connected with a third output power supply (REF).
Preferably, the current sensor calibration device further comprises a current sensor circuit, which passes through the inlet and outlet lines of the constant current sources CN6 and CN7, so that the current sensor RC1 collects the current of the constant current source.
The principle of the utility model is that:
and (3) calibration flow:
1. the circuit is shown in figure 1, an electric wire penetrates through a collecting hole of a current sensor, the electric wire is connected with a constant current source, and the current sensor and the constant current source are both connected with a calibration tool plate through communication wires;
2. firstly, the calibration tooling plate sends an instruction to the constant current source to enable the constant current source to output 0mA current;
3. the calibration tool board sends an instruction to the sensor to enable the sensor to collect 0-point current and subtract the standard value, and the difference between the 0-point current and the standard value is stored in a permanent memory of the processor.
And after the 4.0 point difference acquisition record is finished, performing sectional test, wherein firstly, the calibration tooling plate sends a 5mA current output command to the constant current source, and the constant current source immediately outputs 5mA current to the sensor for acquisition.
5. The calibration tooling board sends a collected 5mA current value and memorizes an instruction to the sensor, the sensor immediately collects a current value after receiving the instruction, the current value is subtracted from the 0 point error value, namely, the offset caused by the 0 point error is eliminated, and then the collected 5mA value with the 0 point error eliminated is recorded and stored in a permanent memory as a module.
6. And analogy is carried out, 10mA,15mA and 20mA. are collected in a segmented mode until the required maximum measuring range is reached, 0-point error deviation is eliminated, and then the collected data are stored in a permanent memory, so that a gain comparison table is generated for the sensor.
7. The sensor is calibrated after generating the gain comparison table and the 0-point error offset.
The current sensor use process flow is as follows:
1. the sensor is supplied with current, and the supplied current can be detected within the range of the sensor range.
2. After the sensor collects the current, offset compensation calculation is carried out on the current and a 0 point recorded during calibration;
3. the number after offset compensation calculation is divided by the calibration value of the maximum range point to determine the size range of the acquired value;
4. and after the size range is determined, selecting the closest segmentation point to perform the modulus removal calculation, measuring the voltage by using a multimeter, firstly using a large gear, and then selecting the closest gear after the range is measured to perform the same measurement principle.
5. The most accurate value is obtained after the measurement and calculation through the steps.
Preferably, the utility model discloses use permanent memory to carry out the collection value of segmentation memory sensor under different current points, and the mode of 0 point error offset for replace, reach the mode of the target of product uniformity through adjusting gain resistance and 0 point offset resistance.
It should be mentioned that the technical features such as current sensor, constant current source that the utility model discloses the patent application relates to should be regarded as prior art, and the concrete structure of these technical features, theory of operation and the control mode that may involve, spatial arrangement mode adopt the conventional selection in this field can, should not be regarded as the invention point of the utility model patent is in, the utility model patent does not further specifically expand the detailed description.
It will be apparent to those skilled in the art that modifications and variations can be made in the above-described embodiments, or some features of the invention may be substituted or omitted, and any modification, substitution, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (5)
1. A current sensor calibration device is used for calibrating a current sensor and is characterized by comprising a constant current source and a calibration tool plate, wherein the constant current source and the current sensor are respectively in communication connection with the calibration tool plate, the constant current source is connected with a collecting hole of the current sensor through a wire, the current sensor is connected with the collecting hole of the current sensor through the wire,
the calibration tooling plate comprises a processing circuit, a constant current source communication circuit, a voltage stabilizing circuit, a start-stop circuit and a reminding circuit, wherein the constant current source communication circuit, the voltage stabilizing circuit, the start-stop circuit and the reminding circuit are respectively and electrically connected with the processing circuit.
2. The current sensor calibration device of claim 1 wherein said processing circuitry comprises a processor U3 and said constant current source communication circuitry comprises a communicator U5, wherein:
the 1 pin of the communicator U5 is electrically connected with the 22 pin of the processor U3, the 2 pin of the communicator U5 is electrically connected with the 25 pin of the processor U3, the 4 pin of the communicator U5 is electrically connected with the 21 pin of the processor U3, a resistor R15 is connected between the 7 pin and the 6 pin of the communicator U5, one end of the resistor R15, which is close to the 7 pin of the communicator U5, is grounded through a capacitor C17, two ends of the capacitor C17 are connected with a voltage regulator ZD1 in parallel, one end of the resistor R15, which is close to the 6 pin of the communicator U5, is grounded through a capacitor C21, and two ends of the capacitor C21 are connected with a voltage regulator ZD2 in parallel.
3. A current sensor calibration device according to claim 2, wherein said start-stop circuit comprises a switch K1 and a switch K2, wherein:
one end of the switch K1 is grounded, the other end of the switch K1 is grounded through a capacitor C15, and one end of the switch K1 close to the capacitor C15 is electrically connected with the 18 pin of the processor U3;
one end of the switch K2 is grounded, the other end of the switch K2 is grounded through a capacitor C16, and one end of the switch K2 close to the capacitor C16 is electrically connected to the 20 pin of the processor U3.
4. The current sensor calibration device as claimed in claim 3, wherein said reminding circuit comprises a transistor Q1, a collector of said transistor Q1 is electrically connected to one end of a buzzer LS1 through a resistor R16, a resistor R18 is connected between a base and an emitter of said transistor Q1, and the base of said transistor Q1 is electrically connected to a pin 44 of said processor U3 through a resistor R17.
5. The current sensor calibration device of claim 4, wherein the voltage regulation circuit comprises a voltage regulator U2, an ampler U1A and an ampler U1B, wherein:
the input end of the voltage stabilizer U2 is connected with an input power supply, the output end of the voltage stabilizer U2 is connected with a first output power supply, the anode input end of the operational amplifier U1A is connected with a first output end unit through a resistor R2, the output end of the operational amplifier U1A is connected with a second output power supply, the second output power supply is electrically connected with the anode input end of the operational amplifier U1B, and the output end of the operational amplifier U1B is connected with a third output power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123189255.1U CN217060480U (en) | 2021-12-15 | 2021-12-15 | Current sensor calibration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123189255.1U CN217060480U (en) | 2021-12-15 | 2021-12-15 | Current sensor calibration device |
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| Publication Number | Publication Date |
|---|---|
| CN217060480U true CN217060480U (en) | 2022-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123189255.1U Active CN217060480U (en) | 2021-12-15 | 2021-12-15 | Current sensor calibration device |
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| CN (1) | CN217060480U (en) |
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2021
- 2021-12-15 CN CN202123189255.1U patent/CN217060480U/en active Active
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