Open-loop sensor

Abstract

The utility model relates to the field of current sensors, in particular to an open-loop sensor. The open-loop sensor comprises a magnetic ring, a coil and a power-on connector. The magnetic ring is provided with a gap used for installing the Hall sensor. The coil is wound on the magnetic ring, and the coil and the notch are located on the two sides of the center position of the magnetic ring respectively. The electrifying connector is electrically connected with the coil, and the electrifying connector can be connected with an external power supply to electrify the coil. The coil is wound on the magnetic ring so as to achieve the debugging purpose by fitting the corresponding measured current, that is, a certain small current is applied to the coil, the magnetic field intensity generated by the coil is the same as that generated by the measured current, and thus the Hall open-loop sensor is calibrated.

Description

Technical Field

[0001] The present application relates to the field of current sensors, and in particular to an open-loop sensor. Background Art

[0002] Common open-loop sensors usually include a magnetic ring and a Hall element. A powered cable passes through the magnetic ring. When the measured current flows into the cable, the magnetic field generated by the measured current acts on the Hall element through the magnetic ring. The Hall element generates a voltage proportional to the measured current. The voltage is amplified and detected, thereby detecting the measured current.

[0003] Currently, when testing and calibrating open-loop sensors, the only way is to pass the cable through the magnetic ring and pass current. In order to ensure the calibration accuracy of the open-loop sensor, the passed current needs to reach more than 50% of the rated current.

[0004] It can be seen that the current open-loop sensor calibration needs to meet many conditions and the process is relatively complicated. For test scenarios with many restrictions, it is difficult to effectively calibrate and debug the open-loop sensor. Utility Model Content

[0005] The present application provides an open-loop sensor, which has the advantages of convenient calibration and high calibration accuracy. The following technical solutions are adopted:

[0006] An open-loop sensor comprises a magnetic ring, a coil, and an energized connector;

[0007] The magnetic ring is provided with a notch for installing a Hall sensor;

[0008] The coil is wound around the magnetic ring, and the coil and the gap are respectively located on both sides of the center of the magnetic ring;

[0009] The power supply connector is electrically connected to the coil, and the power supply connector can be connected to an external power source to realize power supply to the coil.

[0010] By adopting the above technical solution, a coil is wound on the magnetic ring to achieve the debugging purpose by fitting the corresponding measured current, that is, a certain small current is applied to the coil, and the magnetic field generated by the coil has the same magnetic field strength as the measured current, thereby calibrating the Hall open-loop sensor.

[0011] Preferably, the length of the portion of the magnetic ring wound with the coil is less than or equal to 1 / 5 of the circumference of the magnetic ring.

[0012] By adopting the above technical solution, when the open-loop sensor is used for a long time, the coil is easily magnetized, thereby affecting the magnetic permeability of the magnetic core and affecting the accuracy of the open-loop sensor. Therefore, controlling the length of the coil within a smaller range can reduce the influence of the coil on the accuracy of the open-loop sensor.

[0013] Preferably, it also includes a winding frame sleeved on the magnetic ring, the coil is wound around the winding frame, the power-carrying connector is arranged on the winding frame and fixedly connected to the winding frame, and the coil is welded to the power-carrying connector.

[0014] By adopting the above technical solution, the winding frame can provide a good support for the coil. On the one hand, it is convenient for winding the coil. On the other hand, it can separate the coil from the magnetic ring, thereby reducing the influence of the coil on the accuracy of the open-loop sensor.

[0015] Preferably, the winding frame includes two brackets arranged opposite to each other, the two brackets are buckled and detachably connected; and the brackets are provided with mounting grooves that are snap-fitted with the magnetic ring.

[0016] By adopting the above technical solution, both brackets can be buckled on the magnetic ring, which can improve the convenience of installing the winding frame.

[0017] Preferably, one of the brackets is provided with a slot, and the other bracket is provided with a tenon that engages with the slot.

[0018] By adopting the above technical solution, the two brackets are easy to disassemble and assemble through the cooperation of the slots and the tenons, which is helpful for the subsequent maintenance of the open-loop sensor.

[0019] Preferably, a winding groove for placing the coil is opened on the circumference of the winding frame.

[0020] By adopting the above technical solution, the arrangement of the winding groove can, on the one hand, play a positioning role in the winding of the coil, and on the other hand, can play a better protective role for the coil.

[0021] Preferably, a protective cover is provided on the winding groove, and the protective cover is provided on the peripheral side of the winding groove and connected to the winding frame.

[0022] By adopting the above technical solution, the protective cover can cover the outside of the coil, thereby providing better protection for the coil and preventing the coil from being damaged.

[0023] Preferably, two power connectors are provided and are used to connect the positive and negative poles of the power supply respectively, and the two power connectors are respectively located at the two ends of the winding frame.

[0024] By adopting the above technical solution, the coil can be energized by connecting the power connector to an external power source, which is convenient for staff to use.

[0025] In summary, this application includes the following beneficial technical effects:

[0026] 1. When calibrating an open-loop sensor, the coil can be energized. After the coil is energized, a magnetic field will be generated on the magnetic ring. The magnetic field strength can be controlled by adjusting the coil current, thereby fitting the magnetic field strength generated by the measured current to achieve the purpose of open-loop sensor calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the structure of an open-loop sensor in an embodiment of the present application;

[0028] Figure 2 It is a schematic diagram of the explosion structure of the open-loop sensor in the embodiment of the present application;

[0029] Figure 3 It is a schematic diagram of the structure of the winding frame in the embodiment of the present application.

[0030] Markings in the attached drawings: 1, magnetic ring; 11, notch; 2, winding frame; 21, bracket; 22, slot; 23, tenon; 24, mounting slot; 25, winding slot; 3, coil; 4, power connector; 5, protective cover. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-3 This application is described in further detail.

[0032] The present application embodiment discloses an open-loop sensor. Figure 1 and Figure 2 The open-loop sensor includes a magnetic ring 1, a winding frame 2, a coil 3, and an energizing connector 4. The magnetic ring 1 is provided with a notch 11 for installing a Hall sensor; the winding frame 2 is sleeved on the magnetic ring 1, and the winding frame 2 and the notch 11 are respectively located on both sides of the center of the magnetic ring 1; the coil 3 is wound on the magnetic ring 1. Two energizing connectors 4 are provided and are respectively located at both ends of the winding frame 2, and the ends of the coil 3 are welded to the energizing connectors 4. The energizing connector 4 can be connected to an external power source to realize the energization of the coil 3.

[0033] As a preferred implementation of the embodiment of the present application, the winding frame 2 can be eliminated, so that the coil 3 is directly wound on the magnetic ring 1.

[0034] Reference Figure 2 and Figure 3 In the embodiment of the present application, the winding frame 2 includes two relatively arranged brackets 21, and the brackets 21 are provided with mounting grooves 24 that are snap-fitted with the magnetic ring 1. The two brackets 21 are respectively arranged on both sides of the magnetic ring 1 and are buckled with each other, so that the magnetic ring 1 is fixed between the two brackets 21.

[0035] In order to improve the stability of the bracket 21, the inner wall of the bracket 21 is coated with hot melt adhesive. After the bracket 21 is installed on the magnetic ring 1, the hot melt adhesive is heated by a hot air blower or other tools to stick the bracket 21 on the magnetic ring 1. In order to facilitate the connection between the two brackets 21, a slot 22 is provided on one of the brackets 21, and a tenon 23 that is engaged with the slot 22 is provided on the other bracket 21.

[0036] A winding groove 25 is also provided on the circumferential side of the winding frame 2, and the coil 3 is wound in the winding groove 25. The winding groove 25 can play a positioning role for the winding of the coil 3, and can improve the position accuracy of the coil 3. And the length of the coil 3 is controlled by controlling the length of the winding groove 25. In the embodiment of the present application, the length of the portion of the magnetic ring 1 wound with the coil 3 is less than or equal to 1 / 5 of the circumference of the magnetic ring 1, that is, the length of the coil 3 is less than or equal to 1 / 5 of the circumference of the magnetic ring 1, so the length of the winding groove 25 is also less than or equal to 1 / 5 of the circumference of the magnetic ring 1.

[0037] A protective cover 5 is provided on the winding groove 25 . The protective cover 5 is covered on the circumference of the winding groove 25 and connected to the winding frame 2 . The protective cover 5 can effectively protect the coil 3 .

[0038] The implementation principle of the open-loop sensor in the embodiment of the present application is: a coil 3 is wound on the magnetic ring 1 to achieve the debugging purpose by fitting the corresponding measured current, that is, a certain small current is applied to the coil 3, and the magnetic field generated by the coil 3 has the same magnetic field strength as the measured current, thereby calibrating the Hall open-loop sensor.

[0039] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An open-loop sensor, characterized in that: It comprises a magnetic ring (1), a coil (3), and an electrical connector (4); The magnetic ring (1) is provided with a notch (11) for installing a Hall sensor; The coil (3) is wound around the magnetic ring (1), and the coil (3) and the notch (11) are respectively located on both sides of the center position of the magnetic ring (1); The power supply connector (4) is electrically connected to the coil (3), and the power supply connector (4) can be connected to an external power source to realize power supply to the coil (3).

2. The open-loop sensor according to claim 1, characterized in that: The length of the portion of the magnetic ring (1) wound with the coil (3) is less than or equal to 1 / 5 of the circumference of the magnetic ring (1).

3. The open-loop sensor according to claim 1, characterized in that: It also comprises a winding frame (2) sleeved on the magnetic ring (1), the coil (3) being wound around the circumference of the winding frame (2), the power supply connector (4) being arranged on the winding frame (2) and fixedly connected to the winding frame (2), and the coil (3) being welded to the power supply connector (4).

4. The open-loop sensor according to claim 3, characterized in that: The winding frame (2) comprises two brackets (21) arranged opposite to each other, the two brackets (21) being buckled and detachably connected; and a mounting groove (24) for snap-fitting with the magnetic ring (1) is provided on the bracket (21).

5. The open-loop sensor according to claim 4, characterized in that: One of the brackets (21) is provided with a slot (22), and the other bracket (21) is provided with a tenon (23) that engages with the slot (22).

6. The open-loop sensor according to claim 3, characterized in that: A winding groove (25) for placing the coil (3) is provided on the circumference of the winding frame (2).

7. The open-loop sensor according to claim 6, characterized in that: A protective cover (5) is provided on the winding groove (25), and the protective cover (5) is provided on the circumference of the winding groove (25) and is connected to the winding frame (2).

8. The open-loop sensor according to claim 3, characterized in that: The two power supply connectors (4) are respectively located at two ends of the winding frame (2).

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