CN110907875B - Hall current sensor calibration device and method - Google Patents
Hall current sensor calibration device and method Download PDFInfo
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Abstract
The application discloses a zero calibration device of a Hall current sensor, which is applied to calibration of the Hall current sensor; the device comprises: the device comprises a calibration winding, a zero detection coil, a calibration current source and an excitation current detector; a compensation winding is wound on the primary side of the zero detection coil, and an excitation current detection winding is wound on the secondary side of the zero detection coil; the calibration winding is wound on the primary side of the Hall current sensor; wherein the Hall current sensor is in an operating state; the calibration current source, the calibration winding and the compensation winding are sequentially connected to form a loop; the two ends of the excitation current detection winding are respectively connected with the excitation current detector so that the excitation current detector can measure the current of the excitation current detection winding; and the excitation current detector adjusts the output current of the calibration current source according to the measured current of the excitation current detection winding. According to the method and the device, online zero calibration can be carried out on the Hall current sensor, the calibrated Hall current sensor does not need to be detached, and the calibration efficiency is improved.
Description
Technical Field
The present disclosure relates to sensor calibration, and particularly to a hall current sensor calibration apparatus and method.
Background
The Hall current sensor is a current sensor commonly used in the power supply and distribution system of the satellite and the spacecraft at present, and has the advantages of lightness, smallness, high accuracy and the like. Through research, main measurement errors of the Hall current sensor come from zero point errors and linear errors, error components introduced by the linearity of the Hall current sensor have smaller influence than the zero point errors, the zero point errors mainly come from zero magnetic errors introduced by magnetic leakage, magnetic hysteresis and geomagnetic effects of a magnetic core gap and zero potential drift errors introduced by an integrated operational amplifier and a Hall element, and when the Hall current sensor is used in satellites or other complex environments on the ground for a long time, the zero point drift affects the accuracy of measurement results, so that the zero point error calibration problem of the installation type current sensor needs to be solved.
Disclosure of Invention
In order to solve the above technical problem, an embodiment of the present application provides a hall current sensor calibration apparatus and method.
The embodiment of the application provides a zero calibration device of a Hall current sensor, which is applied to calibration of the Hall current sensor, wherein the Hall current sensor is connected with a current sensor gauge outfit; the device comprises: the device comprises a calibration winding, a zero detection coil, a calibration current source and an excitation current detector;
a compensation winding is wound on the primary side of the zero detection coil, and an excitation current detection winding is wound on the secondary side of the zero detection coil;
the calibration winding is wound on the primary side of the Hall current sensor; wherein the Hall current sensor is in an operating state; the working current measured when the Hall current sensor operates is Ip；
The calibration current source, the calibration winding and the compensation winding are sequentially connected to form a loop; the calibration winding and the compensation winding are arranged according to the size of an opening of the Hall current sensor and are formed by winding enameled wires of 0.05-0.8 mm at equal intervals;
the two ends of the excitation current detection winding are respectively connected with the excitation current detector so that the excitation current detector can measure the current of the excitation current detection winding;
the excitation current detector adjusts the output current of the calibration current source according to the measured current of the excitation current detection winding, and the output current of the calibration current source is opposite to the direction of the working current measured when the Hall current sensor operates; the output current of the calibration current source satisfies the following formula:
N1Ic＝Ip
wherein N is1Denotes the number of turns of the calibration winding, IcRepresenting the output current, I, of the calibration current sourcepRepresenting the operating current measured while the hall current sensor is operating;
and when the current measured by the Hall current sensor is zero, the indicating value of the current sensor meter head is the zero error of the Hall current sensor.
The embodiment of the application also provides a zero calibration method of the Hall current sensor, which is applied to a zero calibration device of the Hall current sensor, wherein the Hall current sensor is connected with a current sensor gauge outfit; the device comprises: the device comprises a calibration winding, a zero detection coil, a calibration current source and an excitation current detector; a compensation winding is wound on the primary side of the zero detection coil, and an excitation current detection winding is wound on the secondary side of the zero detection coil; the method comprises the following steps:
winding the calibration winding on the primary side of the Hall current sensor; wherein the Hall current sensor is in an operating state; the working current measured when the Hall current sensor operates is Ip；
Sequentially connecting the calibration current source, the calibration winding and the compensation winding to form a loop; the calibration winding and the compensation winding are arranged according to the size of an opening of the Hall current sensor and are formed by winding enameled wires of 0.05-0.8 mm at equal intervals;
connecting two ends of the excitation current detection winding with the excitation current detector respectively so as to measure the current of the excitation current detection winding through the excitation current detector;
the excitation current detector adjusts the output current of the calibration current source according to the measured current of the excitation current detection winding, and the output current of the calibration current source is opposite to the direction of the working current measured when the Hall current sensor operates; adjusting the output current of the calibration current source to enable the current of the zero detection coil to be smaller than a limit value; when the current of the zero detection coil is smaller than a limit value, the output current of the calibration current source can be considered to satisfy the following formula:
N1Ic＝Ip
wherein N is1Denotes the number of turns of the calibration winding, IcRepresenting the output current, I, of the calibration current sourcepRepresenting the operating current of the hall current sensor during operation.
When the current of the zero detection coil is smaller than a limit value, the primary side of the Hall current sensor is in a zero current state, and the zero point error of the Hall current sensor is determined according to the indicating value of the meter head of the current sensor; the measurement result of the Hall current sensor is obtained according to the indicating value of the current sensor gauge head; when the current measured by the Hall current sensor is zero, the indicating value of the current sensor gauge head is the zero point error of the Hall current sensor.
In the technical scheme of the embodiment of the application, the Hall current sensor zero calibration device is applied to calibration of a Hall current sensor, and the Hall current sensor is connected with a current sensor gauge outfit; the hall current sensor zero calibration device includes: the device comprises a calibration winding, a zero detection coil, a compensation winding, a calibration current source and an excitation current detector; the primary side of the zero detection coil is wound with a compensation winding, and the secondary side of the zero detection coil is wound with an excitation current detection winding; the calibration winding is wound on the primary side of the Hall current sensor; wherein the Hall current sensor is in an operating state; the working current measured when the Hall current sensor operates is Ip(ii) a The calibration current source, the calibration winding and the compensation winding are sequentially connected to form a loop; the calibration winding and the compensation winding are arranged according to the size of an opening of the Hall current sensor and are formed by winding enameled wires of 0.05-0.8 mm at equal intervals; the two ends of the excitation current detection winding are respectively connected with the excitation current detector so that the excitation current detector can measure the current of the excitation current detection winding; the excitation current detector adjusts the output current of the calibration current source according to the measured current of the excitation current detection winding; the output current of the calibration current source and the Hall currentThe working current measured when the sensor operates is opposite in direction; the output current of the calibration current source satisfies the following conditions: n is a radical of1Ic＝IpWherein N is1Denotes the number of turns of the calibration winding, IcRepresenting the output current, I, of the calibration current sourcepRepresenting the working current of the Hall current sensor during operation; and when the current measured by the Hall current sensor is zero, the indicating value of the current sensor meter head is the zero error of the Hall current sensor. According to the technical scheme, the Hall current sensor can be subjected to on-line zero calibration, the calibrated Hall current sensor does not need to be detached, the working state of the tested Hall current sensor does not need to be interrupted, and the efficiency of zero calibration of the Hall current sensor can be effectively improved.
Drawings
Fig. 1 is a schematic diagram of a hall current sensor zero calibration apparatus provided in an embodiment of the present application;
fig. 2 is a schematic diagram of a zero calibration method of a hall current sensor according to an embodiment of the present application.
Detailed Description
So that the manner in which the features and aspects of the present application can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings.
In an embodiment, a non-contact current instrument online calibration device is adopted, the device improves the accuracy of an open type current detection instrument by detecting magnetic leakage, when the device is used for calibrating the current detection instrument, the device can only calibrate the current detection instrument at a specific working point, the calibration accuracy is low, and the device cannot be used for zero calibration of a Hall current sensor.
The embodiment of the application provides a hall current sensor online calibration device at zero point, can realize the online calibration problem of current sensor zero point error, need not to interrupt the operating condition of system under test, need dismantle when having solved installation formula hall current sensor calibration, shut down the scheduling problem.
Fig. 1 is a schematic diagram of a hall current sensor zero calibration device provided in an embodiment of the present application, and as shown in fig. 1, the device is applied to calibration of a hall current sensor 11, and the hall current sensor is connected with a current sensor meter head 10; the device comprises: a calibration winding 12, a zero detection coil 13, a calibration current source 14 and an excitation current detector 15; a compensation winding 16 is wound on the primary side of the zero detection coil 13, and an excitation current detection winding 17 is wound on the secondary side of the zero detection coil;
the calibration winding 12 is wound on the primary side of the hall current sensor 11; wherein the hall current sensor 11 is in an operating state; the working current measured when the Hall current sensor 11 operates is Ip；
The calibration current source 14, the calibration winding 12 and the compensation winding 16 are connected in sequence to form a loop; the calibration winding 12 and the compensation winding 16 are arranged according to the size of the opening of the Hall current sensor 11 and are formed by winding enameled wires of 0.05-0.8 mm at equal intervals;
in an alternative embodiment of the present application, the calibration winding 12 and the compensation winding 16 are open-circuited and short-circuited in the calibration current source 14, and the number of turns of the calibration winding 12 and the number of turns of the compensation winding 16 are the same.
Two ends of the excitation current detecting winding 17 are respectively connected with the excitation current detector 15, so that the excitation current detector 15 measures the current of the excitation current detecting winding 17;
the excitation current detector 15 adjusts the output current of the calibration current source 14 according to the measured current of the excitation current detection winding 17, wherein the output current of the calibration current source 14 is opposite to the direction of the working current measured when the hall current sensor 11 operates; detecting that the current of the zero detection coil is smaller than a limit value; when the current of the zero detection coil is smaller than a limit value, the output current of the calibration current source 14 can be considered to satisfy the following formula:
N1Ic＝Ip
wherein N is1The number of turns of the calibration winding 12 is indicated,Icrepresents the output current, I, of the calibration current source 14pRepresents the operating current measured while the hall current sensor 11 is operating;
the indicating value of the current sensor gauge head 10 is the measuring result of the hall current sensor 11, and when the current measured by the hall current sensor 11 is zero, the indicating value of the current sensor gauge head 10 is the zero point error of the hall current sensor 11.
The following describes, with reference to a specific embodiment, a process of implementing zero calibration on the hall current sensor 11 by using the zero calibration device for the hall current sensor 11 provided in the embodiment of the present application.
As shown in fig. 1, when the calibrated hall current sensor 11 and the current sensor meter 10 are operated on-line, the measured operating current when the hall current sensor 11 is operated is IpWhen zero point error calibration needs to be performed on the hall current sensor 11 in the working state, the winding 12 is calibrated on the primary winding of the hall current sensor 11, wherein the number of turns of the winding 12 wound on the primary winding of the hall current sensor 11 is N1。
A zero-detecting coil 13 is arranged beside the calibrated Hall current sensor 11, preferably, the zero-detecting coil 13 adopts a coil with a magnetic core with high magnetic permeability, an opening 18 which is tightly matched with the zero-detecting coil 13 is made on the zero-detecting coil 13, a compensation winding 16 is wound on the primary side of the zero-detecting coil 13, and the number of turns of the wound compensation winding 16 is also N1The zero detection coil 13 is further wound with an excitation current detection winding 17 on the secondary side and connected to the excitation current detector 15.
The calibration current source 14, the calibration winding 12 and the compensation winding 16 are connected in sequence to form a loop, so that the magnitude and direction of the output current of the calibration current source 14 can be adjusted. In the embodiment of the present application, the calibration current source 14 outputs a current in a direction opposite to the direction of the operating current measured when the hall current sensor 11 operates.
When calibrating the zero point of the hall current sensor 11, the calibration current source 14 outputs the operating current I when the hall current sensor 11 is operatingpCurrent I in opposite directioncAdjusting the output of the calibration current source 14The current is output, and when the current of the zero detection coil 13 is detected to be less than the limit value, N is considered1Ic＝IpThe equivalent current of the primary side of the hall current sensor 11 is zero, and at this time, the zero detection coil 13 is in a balanced state. When N is present1And IcIs not equal to the operating current I of the Hall current sensor 11 during operationpThen, the excitation current detector 15 measures N through the zero detection coil 131And IcProduct of (a) and IpAnd adjusts the output current I of the calibration current source 14 according to the measured differencecUntil the output current I of the current source 14 is calibratedcSatisfies N1Ic＝IpAt this time, it can be considered that the magnetic field intensity generated by the compensation winding 16 and the calibration winding 12 is the same as the magnitude of the compensation intensity generated by the primary current of the hall current sensor 11, and the direction is opposite, which is equivalent to that the current measured by the hall current sensor 11 at the measured point in the system is zero.
The indication value of the current sensor gauge head 10 is the measurement result of the hall current sensor 11, and when the current measured by the hall current sensor 11 is zero, the indication value of the current sensor gauge head 10 is the zero point error of the hall current sensor 11. The zero point error of the hall current sensor 11 can be obtained through the indicating value of the current sensor gauge head 10.
By adopting the technical scheme of the embodiment of the application, the excitation current detector 15 obtains the difference value between the product of the number of turns of the calibration winding 12 and the output current of the calibration current source 14 and the current of the Hall current sensor during operation through the excitation current detection winding 17, adjusts the output current of the calibration current source 14 through the difference value until the product of the number of turns of the calibration winding 12 and the output current of the calibration current source 14 is equal to the current of the Hall current sensor 11 during operation, the indication value of the current sensor meter head 10 is the measurement result of the Hall current sensor 11, when the current measured by the Hall current sensor 11 is zero, the indication value of the current sensor meter head 10 is the zero error of the Hall current sensor 11, at the moment, the zero error of the Hall current sensor 11 can be obtained through the indication value of the current sensor meter head 10, and zero calibration of the Hall current sensor 11 is completed. The hall current sensor 11 zero calibration device provided by the embodiment of the application can be used for the online calibration operation of the hall current sensor 11, the online calibration of the zero error of the hall current sensor 11 is realized, the working state of the hall current sensor 11 is not required to be interrupted when the hall current sensor 11 is calibrated, and the zero calibration of the hall current sensor 11 can be started through timing or remote control signals in practical application.
By adopting the calibration winding 12 and the compensation winding 16, an equivalent zero current value can be realized between the Hall current sensor 11 and the zero detection coil 13, zero calibration of the Hall sensor 11 can be carried out without changing the amplitude of bus current in the device, when the current in the excitation current detection winding 17 is zero, the magnetic field generated by the current in a circuit to be tested is counteracted by the magnetic field generated by the calibration winding 12 and the compensation winding 16, the calibrated Hall current sensor 11 is in a zero current measurement state, the zero point of the Hall current sensor 11 can be obtained through the indication of the current sensor meter head 10, and the zero calibration process is realized. The zero detection coil comparison method adopted by the embodiment of the application can realize the zero calibration task of the Hall current sensor 11 for the space, and does not need to disassemble the Hall current sensor 11 or damage the tested line.
Fig. 2 is a flowchart of a zero calibration method for a hall current sensor according to an embodiment of the present disclosure, where the method is applied to a zero calibration device for a hall current sensor, and the hall current sensor is connected to a current sensor header; the device comprises: the device comprises a calibration winding, a zero detection coil, a calibration current source and an excitation current detector; a compensation winding is wound on the primary side of the zero detection coil, and an excitation current detection winding is wound on the secondary side of the zero detection coil; as shown in fig. 2, the method includes:
and S201, winding the calibration winding on the primary side of the Hall current sensor.
Wherein the Hall current sensor is in an operating state; the working current measured when the Hall current sensor operates is Ip；
And S202, sequentially connecting the calibration current source, the calibration winding and the compensation winding to form a loop.
Specifically, the calibration winding and the compensation winding are arranged according to the opening size of the Hall current sensor and are formed by winding enameled wires of 0.05 mm-0.8 mm at equal intervals; in an alternative embodiment of the present application, the calibration winding and the compensation winding are open-circuited and short-circuited in the calibration current source, and the number of turns of the calibration winding and the number of turns of the compensation winding are the same.
And S203, respectively connecting two ends of the excitation current detection winding with the excitation current detector so as to measure the current of the excitation current detection winding through the excitation current detector.
S204, the excitation current detector adjusts the output current of the calibration current source according to the measured current of the excitation current detection winding, and the current is detected to be smaller than a limit value by detecting the zero detection coil; when the current of the zero detection coil is smaller than a limit value, the output current of the calibration current source can be considered to satisfy: n is a radical of1Ic＝Ip。
Wherein N is1Denotes the number of turns of the calibration winding, IcRepresenting the output current, I, of the calibration current sourcepRepresenting the operating current of the hall current sensor when operating.
It should be noted that the output current of the calibration current source is opposite to the direction of the working current measured when the hall current sensor is in operation.
S205, when the detection current of the zero detection coil is smaller than the limit value, the primary side of the Hall current sensor is in a zero current state, and the zero point error of the Hall current sensor is determined according to the current indication value of the current sensor meter head.
Specifically, the measurement result of the hall current sensor is obtained according to the indication value of the current sensor gauge head; and when the current measured by the Hall current sensor is zero, the indicating value of the current sensor meter is the zero error of the Hall current sensor.
The technical solutions described in the embodiments of the present application can be arbitrarily combined without conflict.
In the several embodiments provided in the present application, it should be understood that the disclosed method and intelligent device may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all functional units in the embodiments of the present application may be integrated into one second processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application.
Claims (2)
1. A zero calibration device of a Hall current sensor is characterized in that the device is applied to calibration of the Hall current sensor, and the Hall current sensor is connected with a current sensor gauge outfit; the device comprises: the device comprises a calibration winding, a zero detection coil, a calibration current source and an excitation current detector;
a compensation winding is wound on the primary side of the zero detection coil, and an excitation current detection winding is wound on the secondary side of the zero detection coil;
the calibration winding is wound on the primary side of the Hall current sensor; wherein the Hall current sensor is in an operating state; the working current measured when the Hall current sensor operates is Ip；
The calibration current source, the calibration winding and the compensation winding are sequentially connected to form a loop; the calibration winding and the compensation winding are arranged according to the size of an opening of the Hall current sensor and are formed by winding enameled wires of 0.05-0.8 mm at equal intervals;
the two ends of the excitation current detection winding are respectively connected with the excitation current detector so that the excitation current detector can measure the current of the excitation current detection winding;
the excitation current detector adjusts the output current of the calibration current source according to the measured current of the excitation current detection winding; the output current of the calibration current source is opposite to the direction of the working current measured when the Hall current sensor operates; the output current of the calibration current source satisfies the following formula:
N1Ic＝Ip
wherein N is1Denotes the number of turns of the calibration winding, IcRepresenting the output current, I, of the calibration current sourcepA measured operating current representative of the Hall current sensor while operating;
and when the current measured by the Hall current sensor is zero, the indicating value of the current sensor meter head is the zero error of the Hall current sensor.
2. A zero calibration method of a Hall current sensor is characterized in that the method is applied to a zero calibration device of the Hall current sensor, and the Hall current sensor is connected with a current sensor gauge outfit; the device comprises: the device comprises a calibration winding, a zero detection coil, a calibration current source and an excitation current detector; a compensation winding is wound on the primary side of the zero detection coil, and an excitation current detection winding is wound on the secondary side of the zero detection coil; the method comprises the following steps:
winding the calibration winding on the primary side of the Hall current sensor; wherein the Hall current sensor is in an operating state; the working current measured when the Hall current sensor operates is Ip；
Sequentially connecting the calibration current source, the calibration winding and the compensation winding to form a loop; the calibration winding and the compensation winding are arranged according to the size of an opening of the Hall current sensor and are formed by winding enameled wires of 0.05-0.8 mm at equal intervals;
connecting two ends of the excitation current detection winding with the excitation current detector respectively so as to measure the current of the excitation current detection winding through the excitation current detector;
the excitation current detector adjusts the output current of the calibration current source according to the measured current of the excitation current detection winding, and the output current of the calibration current source is opposite to the direction of the working current measured when the Hall current sensor operates; adjusting the output current of the calibration current source to enable the current of the zero detection coil to be smaller than a limit value; when the current of the zero detection coil is smaller than a limit value, the output current of the calibration current source can be considered to satisfy the following formula:
N1Ic＝Ip
wherein N is1Denotes the number of turns of the calibration winding, IcRepresenting the output current, I, of the calibration current sourcepA measured operating current representative of the Hall current sensor while operating;
when the current of the zero detection coil is smaller than a limit value, the primary side of the Hall current sensor is in a zero current state, and the zero point error of the Hall current sensor is determined according to the indicating value of the meter head of the current sensor; the measurement result of the Hall current sensor is obtained according to the indicating value of the current sensor gauge head; when the current measured by the Hall current sensor is zero, the indicating value of the current sensor gauge head is the zero point error of the Hall current sensor.
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