Current sensor magnetic induction signal compensation method based on double-path Hall

Abstract

The invention discloses a current sensor magnetic induction signal compensation method based on double-path Hall, and belongs to the technical field of open-close type current sensors. In order to solve the problem that the current sensor is easy to be interfered by a magnetic field and influenced by an opening and closing state due to magnetic leakage and opening and closing errors of an opening and closing type current sensor, the method comprises the following steps of: performing magnetism gathering on a magnetic field generated by a wire at a central position by adopting two symmetrical opening magnetic cores; two Hall devices arranged at the opening of the magnetic core in parallel are adopted to induce the change of a magnetic field. Gain adjustment is carried out on the output of the two-way Hall device, so that the output voltages of the two-way Hall device are consistent when the same current is loaded, the zero potential is adjusted to be 0V, and the output of the Hall device is set to be half of the expected full-scale output; and carrying out addition calculation on the outputs of the two Hall devices to achieve an ideal output state and complete signal compensation. The invention is used for the open-close type current sensor.

Description

Technical Field

[0001] The invention relates to an axisymmetric vector polarized light acquisition device, belonging to the technical field of open-close current sensors. Background Art

[0002] As an extremely important sensor direction, current sensors have been widely used in current measurement and monitoring fields such as automobiles, airplanes, power plants, and subways. Current sensors are divided into various measurement principles such as Hall, reluctance, Rogowski coil, and mutual inductance according to the measurement principle. Among them, the Hall type is divided into closed-loop and open-loop types according to the measurement method. According to the measurement requirements, its magnetic sensing structure can be made into an integrated type or an open-and-close type. The open-and-close type is easily affected by external magnetic field interference and the opening and closing state due to the existence of leakage magnetic field and opening and closing errors. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that an open-and-close current sensor has leakage magnetic field and opening-and-closing errors, which makes the current sensor easily interfered by the magnetic field and affected by the opening-and-closing state, and provides a magnetic induction signal compensation method for a current sensor based on a dual-channel Hall.

[0004] The present invention discloses a method for compensating a magnetic induction signal of a current sensor based on a dual-path Hall, which comprises:

[0005] Two symmetrical open magnetic cores are used to concentrate the magnetic field generated by the conductor at the center, and two Hall devices placed in parallel at the openings of the magnetic cores are used to sense the change of the magnetic field.

[0006] Gain adjustment is performed on the output of the dual-channel Hall device so that the output voltage of the dual-channel Hall device is consistent when the same current is loaded, and the zero potential is adjusted to 0V, and the output of the Hall device is set to half of the expected full-scale output;

[0007] The outputs of the dual-channel Hall devices are added to achieve the ideal output state and complete signal compensation.

[0008] Preferably, the specific method of using two symmetrical open magnetic cores to concentrate the magnetic field generated by the conductor at the center position includes:

[0009] The current sensor includes two symmetrical semicircular magnetic cores. The current in the wire placed at the center of the magnetic core generates a change in the magnetic field.

[0010] Preferably, the two Hall devices are placed in parallel at the openings of the two magnetic cores and connected in series.

[0011] Preferably, a constant current source power supply mode is adopted to load current drive on the two Hall devices to start sensing magnetic field changes.

[0012] Preferably, the specific method for gain adjustment of the output of the dual-channel Hall device includes:

[0013] The output of the dual-channel Hall device is gain-adjusted using a differential current amplifier.

[0014] Preferably, the specific method for performing addition calculation on the outputs of the dual-channel Hall device includes:

[0015] An adder is used to add the outputs of the dual-channel Hall devices.

[0016] Preferably, the outputs of the dual-channel Hall devices are reversely added. Advantages of the present invention: The present invention proposes a magnetic induction signal compensation method for a current sensor based on a dual-channel Hall, a magnetically sensitive sensing unit composed of dual Hall devices, and a magnetic system composed of dual open magnetic cores, which can sense the magnetic field changes generated by the intermediate wires, and a dual-channel signal compensation circuit, which is used for demodulation and conversion of the measured current signal into an output signal. Through two-channel Hall conditioning, the two-channel Hall devices can compensate each other, reduce the interference of surrounding magnetic noise, and continue to work even if a single-channel signal is inaccurate or fails. Gain and position error compensation can be achieved. It has the advantages of fast calculation response, accurate and reliable data, adjustable sensitivity, good leakage magnetic resistance, position error compensation, etc., and can be used in the design of magnetic field signal demodulation circuits for open and close current sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flowchart of the magnetic induction signal compensation method of the current sensor based on dual-channel Hall according to the present invention;

[0018] Figure 2 It is a schematic diagram of the installation of the dual-channel Hall according to the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0022] Embodiment 1:

[0023] Combine the following Figure 1 and Figure 2 This embodiment describes a magnetic induction signal compensation method of a current sensor based on a dual-channel Hall, which includes:

[0024] Two symmetrical open magnetic cores are used to concentrate the magnetic field generated by the conductor at the center, and two Hall devices placed in parallel at the openings of the magnetic cores are used to sense the change of the magnetic field.

[0025] Gain adjustment is performed on the output of the dual-channel Hall device so that the output voltage of the dual-channel Hall device is consistent when the same current is loaded, and the zero potential is adjusted to 0V, and the output of the Hall device is set to half of the expected full-scale output;

[0026] The outputs of the dual-channel Hall devices are added to achieve the ideal output state and complete signal compensation.

[0027] Furthermore, the specific method of using two symmetrical open magnetic cores to focus the magnetic field generated by the conductor at the center position includes:

[0028] The current sensor includes two symmetrical semicircular magnetic cores. The current in the wire placed at the center of the magnetic core generates a change in the magnetic field.

[0029] Furthermore, the two Hall devices are placed in parallel at the openings of the two magnetic cores and connected in series.

[0030] Furthermore, a constant current source power supply mode is used to load current drive on the two Hall devices to start sensing magnetic field changes.

[0031] Furthermore, the specific method of gain adjusting the output of the dual-channel Hall device includes:

[0032] The output of the dual-channel Hall device is gain-adjusted using a differential current amplifier.

[0033] Furthermore, the specific method of adding the outputs of the dual-channel Hall device includes:

[0034] An adder is used to add the outputs of the dual-channel Hall devices.

[0035] Furthermore, the outputs of the dual-channel Hall devices are added inversely.

[0036] In the present invention, a magnetic induction signal compensation method of a current sensor based on dual-channel Hall is proposed to realize compensation for the position error and magnetic field reaction at the opening of the open-and-close current sensor. The constant current power supply design of the dual Hall devices at the opening of the magnetic core is used, and the sensitivity gain is adjusted respectively, the zero potential compensation is performed, and the magnetic field perception at the opening of the magnetic core is realized. At the same time, in order to compensate for the opening position error, the two reverse parallel Hall outputs are output through the adder to realize the perception demodulation of the current magnetic field. It includes: a Hall device for measuring the current magnetic field signal; a magnetic core for gathering the changing magnetic field; a demodulation acquisition unit: for picking up and processing the induction signal of the Hall device.

[0037] The two Hall devices as the sensitive core are arranged in opposite directions and connected in series and are respectively placed at the two openings of the magnetic core.

[0038] The compensation modulates the two Hall device voltage outputs to half of the desired full-scale output, based on the maximum current measured by the current sensor.

[0039] The sensor includes two Hall devices made of highly sensitive materials and two symmetrical semicircular magnetic cores. The current in the wire placed at the center of the magnetic core generates a change in the magnetic field, and the Hall device is used to sense the amplitude of the change in the magnetic field.

[0040] The dual Hall devices are placed in parallel at the openings of the two magnetic cores and connected in series. They are driven by current through the constant current source power supply mode, and the induction magnetic field starts to work.

[0041] The output of the dual Hall sensor plus the differential amplifier current is gain-adjusted to make the output voltage consistent when the same current is loaded, and the zero potential is adjusted to 0V, so that the output is half of the set sensitivity output.

[0042] By designing an adder, the dual Hall outputs are added together to achieve the ideal output state.

[0043] The system of the present invention includes a Hall sensor, a magnetic core, and a data processing and demodulation unit, with fast calculation response and accurate and reliable data. Through two-way Hall conditioning, gain and position error compensation can be achieved. The sensor has higher reliability and stability, and the two-way Hall devices can compensate each other, reduce the interference of surrounding magnetic noise, and continue to work even if a single-way signal is inaccurate or fails.

[0044] like Figure 2 As shown in the figure, it includes: 2-way Hall elements, magnetic core, shaft, mounting hole, and signal conditioning module. The sensor senses the magnetic field generated by the current in the wire in the through hole through two pairs of magnetic cores and Hall devices, generates a weak voltage signal and outputs it after compensation, thereby realizing the current perception. The sensor can be installed in application scenarios such as cars, airplanes, subways, and substations for equipment current detection.

[0045] When starting measurement, the sensor works as follows:

[0046] When current is applied to the wire, the magnetic core gathers current to generate a magnetic field. The two pairs of Hall devices at the opening generate induced voltage by sensing the change in the magnetic field. Since the signal is small, the appropriate gain needs to be adjusted through the circuit. Apply full-scale current to the wire, adjust the amplification factor and adjust the zero point so that the output signal of the two Hall devices becomes half of the expected full-scale output after processing, and keep the zero point output at zero. Since the two pairs of Hall devices are in opposite directions and equal in magnitude relative to the magnetic field at the magnetic core, they are added in reverse through the adder to obtain the compensated output signal.

[0047] like Figure 1 As shown, the sensor is powered on, and constant current is supplied to the two Hall elements for signal processing. When current is applied to the wire, the magnetic core gathers the current to generate a magnetic field, and the two pairs of Hall devices at the opening generate an induced voltage by sensing the change in the magnetic field. The circuit adjusts the appropriate gain so that the output signals of the two Hall devices become half of the expected full-scale output after processing. The zero-point output is kept at zero, and the output is reversely added through an adder to obtain a compensated output signal.

[0048] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A magnetic induction signal compensation method for a current sensor based on a dual-channel Hall, characterized in that: It includes: Two symmetrical open magnetic cores are used to concentrate the magnetic field generated by the conductor at the center, and two Hall devices placed in parallel at the openings of the magnetic cores are used to sense the change of the magnetic field. Gain adjustment is performed on the output of the dual-channel Hall device so that the output voltage of the dual-channel Hall device is consistent when the same current is loaded, and the zero potential is adjusted to 0V, and the output of the Hall device is set to half of the expected full-scale output; The outputs of the dual-channel Hall devices are added to achieve the ideal output state and complete signal compensation.

2. The method for compensating magnetic induction signals of a current sensor based on dual-channel Hall according to claim 1, characterized in that: The specific method of using two symmetrical open magnetic cores to concentrate the magnetic field generated by the conductor at the center position includes: The current sensor includes two symmetrical semicircular magnetic cores. The current in the wire placed at the center of the magnetic core generates a change in the magnetic field.

3. The method for compensating magnetic induction signals of a current sensor based on dual-channel Hall according to claim 1, characterized in that: The two Hall devices are placed in parallel at the openings of the two magnetic cores and connected in series.

4. A method for compensating magnetic induction signals of a current sensor based on dual-channel Hall according to claim 1, 2 or 3, characterized in that: The constant current source power supply mode is used to load current drive on the two Hall devices to start sensing the magnetic field changes.

5. The method for compensating magnetic induction signals of a current sensor based on dual-channel Hall according to claim 1, characterized in that: The specific method of gain adjustment for the output of the dual-channel Hall device includes: The output of the dual-channel Hall device is gain-adjusted using a differential current amplifier.

6. The method for compensating magnetic induction signals of a current sensor based on dual-channel Hall according to claim 1, characterized in that: The specific method of adding the outputs of the dual-channel Hall device includes: An adder is used to add the outputs of the dual-channel Hall devices.

7. The method for compensating magnetic induction signals of a current sensor based on dual-channel Hall according to claim 6, characterized in that: The outputs of the dual Hall devices are added inversely.

Images