CN215953724U

CN215953724U - Temperature drift error compensation unit

Info

Publication number: CN215953724U
Application number: CN202120562156.4U
Authority: CN
Inventors: 周峰; 岳长喜; 余佶成; 梁思远; 李登云; 李鹤; 胡浩亮; 李小飞; 朱凯; 熊魁; 余也凤
Original assignee: State Grid Zhejiang Electric Power Co Ltd; China Electric Power Research Institute Co Ltd CEPRI; Marketing Service Center of State Grid Zhejiang Electric Power Co Ltd
Current assignee: State Grid Zhejiang Electric Power Co Ltd; China Electric Power Research Institute Co Ltd CEPRI; Marketing Service Center of State Grid Zhejiang Electric Power Co Ltd
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2022-03-04
Anticipated expiration: 2031-03-18

Abstract

The application discloses temperature drift error compensation unit. Wherein, the temperature drift error compensation unit includes: the measuring circuit comprises a measuring loop, a signal processing unit and a compensating winding (1), wherein the measuring loop (2) consists of a measuring coil and an amplifying circuit, the measuring coil measures a magnetic field generated by superposition of primary current and exciting current in the measuring coil through a magnetic-sensing resistor chip (3) and outputs voltage, and the amplifying circuit amplifies the voltage and converts the voltage into a corresponding digital signal; the signal processing unit consists of a sensitivity compensation circuit and a reference compensation circuit, the sensitivity compensation circuit is used for adjusting sensitivity change of the magneto-resistance chip caused by temperature, and the reference compensation circuit is used for adjusting zero drift of the magneto-resistance chip; the compensation winding (1) is wound around the measuring coil (2).

Description

Temperature drift error compensation unit

Technical Field

The application relates to the technical field of electric power systems, in particular to a temperature drift error compensation unit.

Background

Current measurement is one of the most important basic supporting technologies of an electric power system, and is directly related to systems for control, protection, metering and the like of electric facilities. Common current measurement devices include hall current sensors, tunneling magnetoresistive current sensors, and the like, which calculate a primary current by measuring a magnetic field generated by a current carrying conductor. However, with the use of the sensor, the magnetoresistance temperature changes, changes the magnetoresistance sensitivity, and affects the measurement result, so that it is necessary to design a temperature drift compensation unit in the magnetic resistance current sensor to improve the accuracy and stability of current measurement.

In order to solve the technical problem of how to design a temperature drift compensation unit in a magnetic resistance current sensor to improve the accuracy and stability of current measurement in the prior art, an effective solution is not provided at present.

Disclosure of Invention

The embodiment of the disclosure provides a temperature drift error compensation unit, which is used for at least solving the technical problems that how to design the temperature drift compensation unit in a magnetic resistance current sensor in the prior art and the accuracy and the stability of current measurement are improved.

According to an aspect of the present application, a temperature drift error compensation unit is provided. Referring to fig. 1, the temperature drift error compensation unit includes a measurement loop, a signal processing unit and a compensation winding 1, the measurement loop is composed of a measurement coil 2 and an amplifying circuit, the measurement coil 2 measures a magnetic field generated by superimposing a primary current and an excitation current in the measurement coil 2 through a magnetic sensitive resistance chip 3, outputs a voltage, and the amplifying circuit amplifies the voltage and converts the voltage into a corresponding digital signal; the signal processing unit consists of a sensitivity compensation circuit and a reference compensation circuit, the sensitivity compensation circuit is used for adjusting sensitivity change of the magneto-resistance chip caused by temperature, and the reference compensation circuit is used for adjusting zero drift of the magneto-resistance chip; the compensation winding 1 is wound around the measuring coil 2.

Optionally, the sensitivity compensation circuit obtains a temperature control amplification factor through a sensitivity change curve of the magnetoresistance along with the temperature according to the resistance value of the temperature sensitive resistor 4, and performs multiple adjustment on the measurement signal.

Optionally, the reference compensation circuit obtains a reference correction voltage from a resistance value of the temperature sensitive resistor 4, and superimposes the reference correction voltage on the original measurement signal amplified by the sensitivity compensation circuit to obtain a compensated primary signal.

Optionally, a feedback current input compensation winding is determined based on the primary signal.

Optionally, the resistance value of the temperature-sensitive resistor 4 is selected according to the actual value of the sensor characteristic, in which the sensitivity fluctuates due to the temperature.

Optionally, the compensation winding 1 receives the compensated feedback current, maintains the magnetic field in the measurement coil in a zero-flux state, and outputs a corresponding current of the magneto-dependent current sensor.

The invention can induce the superposed magnetic field generated by the exciting current and the primary current through the measuring loop, and digitize the measuring signal of the superposed magnetic field, which is beneficial to the subsequent signal processing; and correcting the feedback current according to the error value through the compensation winding. The invention is beneficial to maintaining good working performance of the magnetic-sensing current sensor under the condition of temperature drift of the device. The invention can be used for developing high-precision current sensors required in the wide fields of electric power systems, electric automobiles, precision instruments, chip manufacturing and the like.

The above and other objects, advantages and features of the present application will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the present application will be described in detail hereinafter by way of illustration and not limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

fig. 1 is a schematic diagram of a temperature drift error compensation unit according to an embodiment of the present application.

Detailed Description

It should be noted that, in the present disclosure, the embodiments and features of the embodiments may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to make the technical solutions of the present disclosure better understood by those skilled in the art, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only some embodiments of the present disclosure, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances for describing the embodiments of the disclosure herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Fig. 1 is a schematic diagram of a temperature drift error compensation unit according to an embodiment of the present application. The temperature drift error compensation unit generally comprises a measurement loop, a signal processing unit and a compensation winding 1, wherein the measurement loop consists of a measurement coil 2 and an amplifying circuit, the measurement coil 2 measures a magnetic field generated by superposition of primary current and excitation current in the measurement coil 2 through a magnetic sensitive resistance chip 3, voltage is output, and the amplifying circuit amplifies the voltage and converts the voltage into a corresponding digital signal; the signal processing unit consists of a sensitivity compensation circuit and a reference compensation circuit, the sensitivity compensation circuit is used for adjusting sensitivity change of the magneto-resistance chip caused by temperature, and the reference compensation circuit is used for adjusting zero drift of the magneto-resistance chip; the compensation winding 1 is wound around the measuring coil 2.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In the description of the present disclosure, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are presented only for the convenience of describing and simplifying the disclosure, and in the absence of a contrary indication, these directional terms are not intended to indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the disclosure; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A temperature drift error compensation unit, characterized in that the temperature drift error compensation unit comprises: a measuring circuit, a signal processing unit and a compensation winding (1),

the measuring loop consists of a measuring coil (2) and an amplifying circuit, the measuring coil (2) measures a magnetic field generated by superposition of primary current and exciting current in the measuring coil (2) through a magnetic sensitive resistance chip (3) and outputs voltage, and the amplifying circuit amplifies the voltage and converts the voltage into a corresponding digital signal;

the signal processing unit consists of a sensitivity compensation circuit and a reference compensation circuit, the sensitivity compensation circuit is used for adjusting sensitivity change of the magneto-resistance chip caused by temperature, and the reference compensation circuit is used for adjusting zero drift of the magneto-resistance chip;

the compensation winding (1) is wound on the measuring coil (2);

the sensitivity compensation circuit obtains a temperature control amplification factor through a sensitivity change curve of the magneto resistor along with the temperature according to the resistance value of the temperature sensitive resistor (4), and the multiple adjustment is carried out on the measurement signal;

the reference compensation circuit obtains reference correction voltage through the resistance value of the temperature-sensitive resistor (4), and the reference correction voltage is superposed with the original measurement signal amplified by the sensitivity compensation circuit to obtain a compensated primary signal.

2. The temperature drift error compensation unit of claim 1,

based on the primary signal, a feedback current input compensation winding is determined.

3. The temperature drift error compensation unit of claim 1,

the resistance value of the temperature-sensitive resistor (4) is selected according to the actual value of the sensor characteristic, wherein the sensitivity of the sensor characteristic fluctuates under the influence of temperature.

4. The temperature drift error compensation unit according to claim 1, comprising:

the compensation winding (1) receives the compensated feedback current, maintains the magnetic field in the measuring coil in a zero magnetic flux state, and outputs corresponding current of the magnetic-sensitive current sensor.