CN111948592A - Current sensor for rail vehicle and its defect detection device and method - Google Patents

Abstract

The invention discloses a current sensor for rail vehicles and a defect detection device and method thereof. The defect detection device comprises a first group of Hall probes and a second group of Hall probes arranged on both sides of the annular iron core , the first set of Hall probes and the second set of Hall probes are respectively distributed as concentric rings of the annular iron core, and each Hall probe is configured to output an electrical signal to characterize the magnetic field it detects strength. According to the current sensor for rail vehicles and the defect detection device and method thereof of the present invention, the implementation is simple and does not require complicated circuit design and algorithm, and at the same time, the defect detection of the current sensor can be performed efficiently and accurately, and the detection result is accurate and reliable.

Description

Current sensor for rail vehicle and its defect detection device and method

technical field

The invention relates to the verification and defect detection of a current sensor, in particular to a current sensor used for rail vehicles and a defect detection device and method thereof.

Background technique

The current sensor is a kind of important current measurement equipment. It indirectly measures the current by measuring the magnetic field generated by the primary current. After signal processing, it outputs a low voltage or small current signal. System security requirements.

Current sensors are widely used, mainly used in inverters, DC/DC converters, motor controllers, uninterruptible power supplies, switching power supplies, process control and battery management systems, etc., involving railway vehicles and other rail transportation, traditional industries, wind energy And solar energy and other new energy, medical equipment and automation and other fields.

In order to meet the technical requirements of the whole machine or system, current sensors based on different technologies have been developed one after another. Their measurement range, accuracy, bandwidth, electrical insulation, response speed, anti-interference ability and other properties are different, and the cost is also very different. Current sensors used in industrial applications are usually based on the following five measurement technologies: 1) Hall current sensor; 2) Fluxgate current sensor; 3) Magnetoresistive current sensor; 4) Rogowski coil; 5) Current transformer. Among them, the Hall current sensor is the most widely used. Its basic principle is to use the Hall induction unit to measure the magnetic induction intensity B generated by the current, and obtain the magnitude and direction of the measured current through signal processing. The Hall induction unit based on the Hall effect, Can be packaged in an integrated circuit. The outstanding feature of Hall current sensor is that it can measure DC, AC and complex current waveforms, while the output signal of electrical isolation is voltage or current, and the accuracy is generally high. Although auxiliary power is required, its power consumption is small. Therefore, it is extremely convenient and reliable to use, so it is widely used in rail transportation fields such as railway vehicles.

At present, there are few detection and calibration devices or defect detection technologies for current sensors such as Hall current sensors. Among them, the patent CN201610569937 with the subject title of "A Hall Current Sensor Calibration Method" introduces a signal conditioning circuit and DSP. Another way is to detect whether the Hall chip embedded in the gap of the magnetic core of the current sensor is bent or not.

However, the defect detection technology of the first current sensor described above has the disadvantage that the circuit design and algorithm are very complicated, while the defect detection technology of the second current sensor described above has the disadvantage that the error is very large.

Therefore, there is an urgent need to design a device and method with simpler design and algorithm, and which can accurately detect the defects of the current sensor.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the defects that the circuit design and algorithm of the defect detection technology of the existing current sensor are too complicated or the detection error is too large, and a new current sensor for rail vehicles and the same is proposed. Defect detection apparatus and method.

The present invention solves the above-mentioned technical problems by adopting the following technical solutions:

The present invention provides a defect detection device for a current sensor of a rail vehicle. The current sensor has an annular iron core, and is characterized in that the defect detection device includes first A set of Hall probes and a second set of Hall probes, the first set of Hall probes and the second set of Hall probes are respectively distributed as concentric rings of the annular iron core, and each Hall probe is configured as An electrical signal can be output to characterize the strength of the magnetic field it detects.

Preferably, the planes where the first group of Hall probes are located and the planes where the second group of Hall probes are located are equally spaced from the annular side surfaces of the adjacent annular iron cores.

Preferably, in the first set of Hall probes and the second set of Hall probes, the distances between adjacent Hall probes are equal.

Preferably, the first set of Hall probes and the second set of Hall probes respectively include an even number of Hall probes, and each Hall probe is made of a flexible PCB (ie, a flexible printed circuit board).

Preferably, the defect detection device further includes a controller, and the controller is configured to receive the electrical signal output by the Hall probe, so as to judge whether the magnetic field intensity measured by the Hall probe is uniformly distributed.

Preferably, the current sensor is a Hall current sensor.

The present invention also provides a current sensor for rail vehicles, which is characterized in that it includes the above-mentioned defect detection device.

The present invention also provides a defect detection method for a current sensor of a rail vehicle, wherein the current sensor has an annular iron core, and is characterized in that the defect detection method includes:

A first group of Hall probes and a second group of Hall probes are respectively arranged on both sides of the annular iron core, wherein the first group of Hall probes and the second group of Hall probes are respectively distributed in the shape of the annular iron core a concentric ring of cores, each Hall probe is configured to output an electrical signal to characterize the strength of the magnetic field it detects;

A current is passed through the primary coil of the current sensor, so that the annular iron core generates an induced magnetic field;

The magnetic field intensity measured by the Hall probe is acquired to determine whether the distribution of the magnetic field intensity is uniform.

Preferably, the planes where the first group of Hall probes are located and the planes where the second group of Hall probes are located are equally spaced from the annular side surfaces of the adjacent annular iron cores, and in the first group In the Hall probe and the second group of Hall probes, the distances between adjacent Hall probes are equal.

Preferably, the first group of Hall probes and the second group of Hall probes respectively include an even number of Hall probes, each of which is made of a flexible PCB, and the current sensor is a Hall current. sensor.

On the basis of conforming to common knowledge in the art, the above preferred conditions can be combined arbitrarily to obtain preferred examples of the present invention.

The positive progressive effect of the present invention is:

According to the current sensor for rail vehicles and the defect detection device and method thereof of the present invention, the implementation is simple and does not require complicated circuit design and algorithm, and at the same time, the defect detection of the current sensor can be performed efficiently and accurately, and the detection result is accurate and reliable.

Description of drawings

1 is a perspective view of a defect detection apparatus for a current sensor of a rail vehicle according to a preferred embodiment of the present invention.

2 is a front view of a defect detection apparatus for a current sensor of a rail vehicle according to a preferred embodiment of the present invention.

Detailed ways

The preferred embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. The following descriptions are exemplary rather than limiting of the present invention, and any other similar situations will also fall within the protection scope of the present invention.

In the following detailed description, directional terms, such as "left", "right", "upper", "lower", "front", "rear", etc., are used with reference to the directions described in the drawings. Components in various embodiments of the invention may be oriented in a variety of different orientations, and directional terminology is used for purposes of illustration and not limitation.

Referring to FIGS. 1-2 , according to a defect detection device for a current sensor 1 for a rail vehicle according to a preferred embodiment of the present invention, the current sensor 1 has an annular iron core 12 , a primary coil, and a Hall induction unit 11 , wherein the During defect detection, a current IP is passed through the primary _coil . The defect detection device includes a first set of Hall probes 2 and a second set of Hall probes 2 arranged on both sides of the annular iron core 12 , the first set of Hall probes 2 and the second set of Hall probes 2 are respectively distributed in a ring shape Concentric rings of iron cores 12, each Hall probe 2 is configured to output an electrical signal, such as a voltage signal or a current signal, to characterize the strength of the magnetic field it detects.

By comparing the magnitudes of the magnetic fields at different points, it can be determined whether the spatial distribution of the magnetic field generated by the annular iron core 12 is uniform, so as to realize the defect detection of the current sensor 1 . The more uniform the magnetic field distribution is, the better the quality or performance of the current sensor 1 is.

According to some preferred embodiments of the present invention, the planes where the first group of Hall probes 2 are located and the planes where the second group of Hall probes 2 are located are equally spaced from the annular side surfaces of the adjacent annular iron cores 12 .

According to some preferred embodiments of the present invention, in the first group of Hall probes 2 and the second group of Hall probes 2, the distances between adjacent Hall probes 2 are equal.

According to some preferred embodiments of the present invention, the first set of Hall probes 2 and the second set of Hall probes 2 respectively comprise an even number of Hall probes 2, such as 6, 8 or 10 Hall probes 2, so that the Hall probes 2 The arrangement of the probe 2 has better symmetry, so as to judge the uneven distribution of the spatial magnetic field and the specific situation of the uneven distribution. Wherein, each Hall probe 2 may be made of a flexible PCB.

According to some preferred embodiments of the present invention, the defect detection apparatus further includes a controller (not shown in the figure), and the controller is configured to receive the electrical signal output by the Hall probe 2 to determine the magnetic field measured by the Hall probe 2 Whether the intensity is evenly distributed.

In some typical embodiments, the defect detection device may be particularly suitable for the Hall current sensor 1 .

According to some preferred embodiments of the present invention, the current sensor 1 for rail vehicles may be equipped with a defect detection device as above.

The defect detection method for the current sensor 1 for rail vehicles according to the preferred embodiment of the present invention may include:

The first set of Hall probes 2 and the second set of Hall probes 2 are respectively arranged on both sides of the annular iron core 12 of the current sensor 1 , wherein the first set of Hall probes 2 and the second set of Hall probes 2 are respectively distributed in a ring shape Concentric rings of iron cores 12, each Hall probe 2 is configured to output an electrical signal to characterize the strength of the magnetic field it detects;

A current is passed through the primary coil of the current sensor 1, so that the toroidal iron core 12 generates an induced magnetic field;

Obtain the magnetic field strength measured by the Hall probe 2 to determine whether the distribution of the magnetic field strength is uniform.

According to some preferred embodiments of the present invention, the planes where the first group of Hall probes 2 are located and the planes where the second group of Hall probes 2 are located are equally spaced from the annular side surfaces of the adjacent annular iron cores 12 . Preferably, in the first group of Hall probes 2 and the second group of Hall probes 2, the distances between adjacent Hall probes 2 are equal.

According to some preferred embodiments of the present invention, the first set of Hall probes 2 and the second set of Hall probes 2 respectively include an even number of Hall probes 2, and each Hall probe 2 is made of a flexible PCB.

According to the above-mentioned preferred embodiment of the present invention, the defect detection device and method for a current sensor of a rail vehicle can be implemented simply and without complicated circuit design and algorithm, and at the same time, the defect detection of the current sensor can be performed efficiently and accurately, and the detection result is accurate. Reliable without destroying the current sensor appearance.

Although specific embodiments of the present invention have been described above, those skilled in the art will understand that these are merely illustrative and the scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, and these changes and modifications all fall within the protection scope of the present invention.

Claims (10)

1. A defect detection device for a current sensor of a rail vehicle, the current sensor having an annular iron core, wherein the defect detection device comprises a first group of horns arranged on both sides of the annular iron core Hall probes and a second set of Hall probes, the first set of Hall probes and the second set of Hall probes are respectively distributed as concentric rings of the annular iron core, and each Hall probe is configured to be capable of outputting electrical signal to characterize the strength of the magnetic field it detects. 2 . The defect detection device according to claim 1 , wherein the plane where the first group of Hall probes are located and the plane where the second group of Hall probes are located are adjacent to the annular shape of the annular iron core. 3 . The sides are equally spaced. 3 . The defect detection device according to claim 1 , wherein in the first group of Hall probes and the second group of Hall probes, the distances between adjacent Hall probes are equal. 4 . 4. The defect detection device of claim 1, wherein the first group of Hall probes and the second group of Hall probes respectively comprise an even number of Hall probes, and each Hall probe is composed of a flexible PCB. production. 5. The defect detection device according to claim 1, characterized in that, the defect detection device further comprises a controller, and the controller is configured to receive the electrical signal output by the Hall probe to judge the Whether the magnetic field strength measured by the Hall probe is evenly distributed. 6. The defect detection device of claim 1, wherein the current sensor is a Hall current sensor. 7. A current sensor for rail vehicles, characterized in that it comprises the defect detection device according to any one of claims 1-6. 8. A defect detection method for a current sensor of a rail vehicle, the current sensor having an annular iron core, wherein the defect detection method comprises: A first group of Hall probes and a second group of Hall probes are respectively arranged on both sides of the annular iron core, wherein the first group of Hall probes and the second group of Hall probes are respectively distributed in the shape of the annular iron core a concentric ring of cores, each Hall probe is configured to output an electrical signal to characterize the strength of the magnetic field it detects; A current is passed through the primary coil of the current sensor, so that the annular iron core generates an induced magnetic field; The magnetic field intensity measured by the Hall probe is acquired to determine whether the distribution of the magnetic field intensity is uniform. 9 . The defect detection method according to claim 8 , wherein the plane where the first group of Hall probes are located and the plane where the second group of Hall probes are located are adjacent to the annular shape of the annular iron core. 10 . The side surfaces are equally spaced, and in the first set of Hall probes and the second set of Hall probes, the respective adjacent Hall probes are equally spaced. 10. The defect detection method of claim 8, wherein the first group of Hall probes and the second group of Hall probes respectively comprise an even number of Hall probes, and each Hall probe is composed of a flexible PCB. made, and the current sensor is a Hall current sensor.

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