Current sensor and electronic device

Abstract

The utility model discloses a current sensor and an electronic device, the current sensor comprises a conductor and a magnetic sensor, two ends of the conductor are respectively provided with an input interface and an output interface which are used for being communicated with an external device, and a notch located between the input interface and the output interface is formed on the conductor. Two bending parts with opposite bending directions are formed on the two sides of the notch, and a mounting port is formed between the two bending parts; the magnetic sensor is arranged in the installation opening in a penetrating mode, the two ends of the magnetic sensor are connected with the two bending parts respectively, the two sensing elements are arranged at the two opposite ends of the magnetic sensor respectively, and the two sensing elements correspond to the two resistors one to one. According to the utility model, the sensing elements and the corresponding resistors are arranged at the included angles, so that the magnetic induction lines can vertically or horizontally penetrate into the corresponding sensing elements, and the sensing elements can directly sense the magnetic induction lines instead of sensing through components of the magnetic induction lines, thereby further improving the sensitivity to a magnetic field.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a current sensor and electronic equipment. Background Art

[0002] Current sensors are used to measure current in current transmission media and can be widely used in various scenarios where current measurement is required. Existing current sensors generally include magnetostrictive sensors, Hall effect sensors, and resistive sensors.

[0003] Existing Hall effect sensors usually place the sensing element above or below the current conductor and in parallel with the current conductor, so that the sensing element can only sense through the component of the magnetic field. When the magnetic field strength is low, its magnetic flux line component may cause the sensing element not to trigger. Therefore, this type of current sensor has the problem of insufficient sensitivity to the magnetic field. Utility Model Content

[0004] The main purpose of the utility model is to provide a current sensor and an electronic device, aiming to solve the problem that the existing Hall effect sensor has insufficient sensitivity to the magnetic field.

[0005] To achieve the above object, the utility model provides a current sensor, comprising:

[0006] A conductor, wherein an input interface and an output interface for communicating with an external device are respectively arranged at two ends of the conductor, a cutout is formed on the conductor between the input interface and the output interface, two bending portions with opposite bending directions are formed on both sides of the cutout, and a mounting opening is formed between the two bending portions, a resistor is arranged on each of the two bending portions, and the two resistors are arranged opposite to each other;

[0007] A magnetic sensor, wherein the magnetic sensor is inserted into the mounting opening, and two ends of the magnetic sensor are respectively connected to the two bending portions, and two sensing elements are respectively arranged at opposite ends of the magnetic sensor, and the two sensing elements correspond to the two resistors one by one;

[0008] The currents flowing through the two resistors respectively form two magnetic fields. The two sensing elements are used to sense the magnetic fields formed by the corresponding resistors. The sensing elements are arranged at an angle to the corresponding resistors so that the magnetic flux lines of each magnetic field penetrate the corresponding sensing element vertically or horizontally.

[0009] Preferably, the magnetic sensor is a long strip structure, and the magnetic sensor is used to extend into the incision along its extension direction, so as to expand the two sides of the incision outward from the incision to form the two bending portions.

[0010] Preferably, the two resistors are arranged in parallel, the sensing element is a vertical Hall sensor, the two ends of the magnetic sensor are respectively connected to the two resistors, and the magnetic sensor is perpendicular to the two resistors, so that the magnetic flux lines of each magnetic field vertically penetrate the corresponding sensing element.

[0011] Preferably, the sensor element is an MR chip or a Hall chip.

[0012] Preferably, the sensing element is a horizontal Hall sensor, and two ends of the magnetic sensor are respectively connected to the two resistors, so that the magnetic flux lines generated by each magnetic field horizontally penetrate the corresponding sensing element.

[0013] Preferably, the current sensor further comprises a measuring circuit and a processing circuit, the measuring circuit being used to measure the voltage drop across each of the resistors, and the processing circuit being used to calculate the current value according to the voltage drop.

[0014] Preferably, the resistor and the corresponding bending portion are integrally formed, and the resistance values ​​of the two resistors are equal.

[0015] Preferably, the conductor comprises two guide portions spliced ​​and arranged along the width direction of the conductor, a connection between the two guide portions forms the incision extending along the length direction of the conductor, and the two guide portions have the same thickness.

[0016] Preferably, both ends of the incision along the length direction are provided with incision stop holes, the incision stop holes are arranged at intervals from the cutting, and the incision stop holes are through holes penetrating the conductor.

[0017] The utility model also provides an electronic device, wherein the electronic device is applied with the above-mentioned current sensor.

[0018] In the technical solution of the utility model, a cut is provided on the conductor, and the two sides of the cut are bent in two opposite directions respectively to form an installation opening, and a magnetic sensor is inserted into the installation hole. At this time, two bent parts are provided at the two ends of the magnetic sensor, and current flows through the two bent parts to form a magnetic field. The magnetic flux lines of the two magnetic fields pass through the installation opening, and the two sensing elements at the two ends of the magnetic sensor respectively sense the magnetic field generated by the corresponding bent parts. Since the sensing element is located at the end of the magnetic sensor and is arranged close to the two resistors, the nearest magnetic flux line can be sensed. The closer the magnetic flux line is to the resistor, the higher the intensity is and the easier it is to be sensed. Therefore, the sensing element is arranged close to the resistor to improve the sensing sensitivity. At the same time, the sensing element is arranged at an angle with the corresponding resistor, so that the magnetic flux line can vertically or horizontally penetrate the corresponding sensing element, so that the sensing element can directly sense the magnetic flux line instead of sensing through the components of the magnetic flux line, thereby further improving the sensitivity to the magnetic field. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the structure of a current sensor according to an embodiment of the utility model;

[0021] Figure 2 It is a top view schematic diagram of a conductor of a current sensor according to an embodiment of the utility model;

[0022] Figure 3 A schematic diagram of a partial structure and magnetic field of a current sensor according to an embodiment of the utility model;

[0023] Figure 4 This is a schematic diagram of the structure of a magnetic sensor of a current sensor according to an embodiment of the utility model;

[0024] Figure 5 FIG. 1 is a schematic diagram of a partial structure and magnetic field of a current sensor according to an embodiment of the present invention.

[0025] Description of Figure Numbers:

[0026] Label name Label name 1 Current Sensors 15 Mounting port 10 conductor 20 resistance 11 Input Interface 30 Cut-out stop hole 12 Output Interface 40 Magnetic flux lines 13 incision 50 Magnetic Sensors 14 Bending part 51 Sensing element

[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0031] The utility model provides a current sensor 1.

[0032] Please combine Figure 1 , Figure 2 , Figure 3 and Figure 5 The current sensor 1 of the utility model comprises a conductor 10 and a magnetic sensor 50. An input interface 11 and an output interface 12 for communicating with an external device are respectively arranged at two ends of the conductor 10. A cutout 13 is formed on the conductor 10 between the input interface 11 and the output interface 12. Two bending portions 14 with opposite bending directions are formed on both sides of the cutout 13, and a mounting opening 15 is formed between the two bending portions 14. A resistor 20 is arranged on each of the two bending portions 14, and the two resistors 20 are arranged oppositely. The magnetic sensor 50 is inserted into the mounting opening 15, and the two ends of the magnetic sensor 50 are respectively connected to the two bending portions 14. Two sensing elements 51 are respectively arranged at the opposite ends of the magnetic sensor 50, and the two sensing elements 51 correspond to the two resistors 20 one by one. The current flowing through the two resistors 20 respectively forms two magnetic fields. The two sensing elements 51 are used to sense the magnetic fields formed by the corresponding resistors 20. The sensing elements 51 are arranged at an angle with the corresponding resistors 20 so that each magnetic field magnetic flux line 40 vertically or horizontally penetrates the corresponding sensing element 51.

[0033] It can be understood that if the conductor 10 is regarded as lying flat, the two bends 14 are formed by bending upward and downward respectively. After the conductor 10 is powered through the input interface 11 and the output interface 12, the entire conductor 10 will form a magnetic field along its extension direction. The magnetic field at the bend 14 just passes through the installation port 15, and the magnetic sensor 50 abuts against the two bends 14 respectively.

[0034] In the technical solution of the utility model, a cutout 13 is provided on the conductor 10, and the two sides of the cutout 13 are bent in two opposite directions to form a mounting opening 15, and the magnetic sensor 50 is inserted into the mounting hole. At this time, the two bent portions 14 are respectively provided at the two ends of the magnetic sensor 50, and current flows through the two bent portions 14 to form a magnetic field. The magnetic flux lines 40 of the two magnetic fields pass through the mounting opening 15, and the two sensing elements 51 at the two ends of the magnetic sensor 50 respectively sense the magnetic field generated by the corresponding bent portion 14. Since the sensing element 51 is located at the magnetic sensor 50 The end of the sensor 51 is arranged close to the two resistors 20, so the nearest magnetic flux lines 40 can be sensed. The closer the magnetic flux lines 40 are to the resistors 20, the higher the strength is and the easier it is to be sensed. Therefore, the sensor element 51 is arranged close to the resistors 20 to improve the sensing sensitivity. At the same time, the sensor element 51 is arranged at an angle to the corresponding resistor 20, so that the magnetic flux lines 40 can penetrate the corresponding sensor element 51 vertically or horizontally, so that the sensor element 51 can directly sense the magnetic flux lines 40 instead of sensing through the components of the magnetic flux lines 40, thereby further improving the sensitivity to the magnetic field.

[0035] In one embodiment, the magnetic sensor 50 is a long strip structure, and the magnetic sensor 50 is used to extend into the cutout 13 along its extension direction, so as to expand the two sides of the cutout 13 outward from the cutout 13 to form two bent portions 14. The magnetic sensor 50 penetrates the cutout 13 and expands the cutout 13 to form the installation opening 15, and the conductor 10 on both sides of the cutout 13 forms the bent portions 14. The magnetic sensor 50 can be a polygonal prism or a cylinder, so that the magnetic sensor 50 does not need to be arranged outside the conductor 10, thereby reducing the overall volume of the sensor.

[0036] Furthermore, the two sensing elements 51 may be correspondingly arranged at the portions where the magnetic sensor 50 contacts the two resistors 20 , so that the sensing elements 51 are directly opposite to the magnetic fields generated by the resistors 20 , thereby improving their magnetic field sensitivity.

[0037] See also Figure 5 , understandably, Figure 3 and Figure 5 The circle with an arrow in the middle represents the magnetic flux lines. In an optional embodiment, the two resistors 20 are arranged in parallel, the sensing element 51 is a vertical Hall sensor, and the two ends of the magnetic sensor 50 are respectively connected to the two resistors 20, and the magnetic sensor 50 is perpendicular to the two resistors 20, so that each magnetic field magnetic flux line 40 vertically penetrates the corresponding sensing element 51. The vertical Hall sensor requires the magnetic flux lines 40 to vertically penetrate the sensing element 51 to obtain the maximum sensing sensitivity. Therefore, the two resistors 20 are arranged in parallel, and the magnetic sensor 50 is arranged vertically to the two resistors 20, so that the magnetic flux lines 40 generated by the two resistors 20 can just vertically pass through the two sensing elements 51 at both ends of the magnetic sensor 50, thereby improving the sensitivity of the sensing element 51 to the magnetic field.

[0038] Specifically, the sensor element 51 is an MR chip or a Hall chip. Both the MR chip and the Hall chip have high magnetic field sensitivity, as well as low power consumption and cost, making them applicable to a variety of scenarios and improving their applicability.

[0039] Please combine Figure 3 and Figure 4 In another optional embodiment, the sensing element 51 is a horizontal Hall sensor, and the two ends of the magnetic sensor 50 are respectively connected to the two resistors 20, so that the magnetic flux lines 40 generated by each magnetic field horizontally penetrate the corresponding sensing element 51. When the sensing element 51 is a horizontal Hall sensor, the magnetic flux lines 40 need to horizontally penetrate the sensing element 51 to obtain the maximum sensing sensitivity. At this time, by adjusting the angle between the magnetic sensor 50 and the two resistors 20, the sensing elements 51 at both ends of the magnetic sensor 50 are parallel to the magnetic flux lines 40 of the corresponding magnetic field, thereby improving the sensitivity of the sensing element 51 to the magnetic field.

[0040] Furthermore, the current sensor 1 also includes a measuring circuit and a processing circuit, wherein the measuring circuit is used to measure the voltage drop across each resistor 20, and the processing circuit is used to calculate the current value based on the voltage drop. By setting the measuring circuit and the processing circuit, the voltage drop across the resistor 20 is measured, and then the current value is calculated to form a resistor 20 type sensor, and the resistor 20 type sensor is integrated with the Hall effect sensor, and the current can be measured in two ways at the same time, thereby improving the detection precision and accuracy.

[0041] In one embodiment, the resistor 20 and the corresponding bent portion 14 are integrally formed, and the resistance 20 values ​​of the two resistors 20 are equal. The resistance 20 values ​​of the two resistors 20 are the same, so that the currents passing through the two bent portions 14 are the same, and the magnetic field strengths generated are also close to the same, so that each sensor element 51 detects the magnetic field generated by the corresponding bent portion 14, and crosstalk will not be caused due to the large difference in the strength of the two magnetic fields, thereby improving the detection accuracy and sensitivity.

[0042] In one embodiment, the conductor 10 includes two guide parts spliced ​​and arranged along the width direction of the conductor 10, and the connection between the two guide parts forms a cutout 13 extending along the length direction of the conductor, and the two guide parts have the same thickness. The conductor 10 can be made by splicing two long strip guide parts, the middle parts of the two guide parts are offset to form an installation opening 15, and the two ends are spliced. Compared with the integrally formed conductor 10, the conductor 10 formed by splicing two guide parts has lower cost and higher production efficiency.

[0043] Furthermore, both ends of the cutout 13 along the extension direction thereof are provided with cutout stop holes 30, and the cutout stop holes 30 are through-conductors 10. By providing through holes at both ends of the cutout 13, the cutout 13 is prevented from further expanding, the stability of the bent portion 14 is ensured, and the angle between the magnetic sensor 50 and the resistor 20 is not affected, thereby ensuring that the magnetic sensitivity of the magnetic sensor 50 remains unchanged.

[0044] The utility model also provides an electronic device, which is applied with the above-mentioned current sensor 1. The specific structure of the current sensor 1 refers to the above-mentioned embodiment. Since the electronic device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0045] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the concept of the utility model, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A current sensor, characterized in that: include: A conductor, wherein an input interface and an output interface for communicating with an external device are respectively arranged at two ends of the conductor, a cutout is formed on the conductor between the input interface and the output interface, two bending portions with opposite bending directions are formed on both sides of the cutout, and a mounting opening is formed between the two bending portions, a resistor is arranged on each of the two bending portions, and the two resistors are arranged opposite to each other; A magnetic sensor, wherein the magnetic sensor is inserted into the mounting opening, and two ends of the magnetic sensor are respectively connected to the two bending portions, and two sensing elements are respectively arranged at opposite ends of the magnetic sensor, and the two sensing elements correspond to the two resistors one by one; The currents flowing through the two resistors respectively form two magnetic fields. The two sensing elements are used to sense the magnetic fields formed by the corresponding resistors. The sensing elements are arranged at an angle to the corresponding resistors so that the magnetic flux lines of each magnetic field penetrate the corresponding sensing element vertically or horizontally.

2. The current sensor according to claim 1, characterized in that The magnetic sensor is a long strip structure, and the magnetic sensor is used to extend into the incision along its extension direction, so as to open the two sides of the incision outward from the incision to form the two bending parts.

3. The current sensor according to claim 1, characterized in that The two resistors are arranged in parallel, the sensing element is a vertical Hall sensor, the two ends of the magnetic sensor are respectively connected to the two resistors, and the magnetic sensor is perpendicular to the two resistors, so that the magnetic flux lines of each magnetic field vertically penetrate the corresponding sensing element.

4. The current sensor according to claim 3, characterized in that The sensor element is an MR chip or a Hall chip.

5. The current sensor according to claim 1, wherein: The sensing element is a horizontal Hall sensor, and two ends of the magnetic sensor are respectively connected to the two resistors, so that the magnetic flux lines generated by each magnetic field horizontally penetrate the corresponding sensing element.

6. The current sensor according to any one of claims 1 to 5, characterized in that: The current sensor further comprises a measuring circuit and a processing circuit, wherein the measuring circuit is used to measure the voltage drop across each of the resistors, and the processing circuit is used to calculate the current value according to the voltage drop.

7. The current sensor according to any one of claims 1 to 5, characterized in that: The resistor and the corresponding bending portion are integrally formed, and the resistance values ​​of the two resistors are equal.

8. The current sensor according to any one of claims 1 to 5, characterized in that: The conductor comprises two guide parts which are spliced ​​and arranged along the width direction of the conductor, the connection between the two guide parts forms the cut extending along the length direction of the conductor, and the two guide parts have the same thickness.

9. The current sensor according to any one of claims 1 to 5, characterized in that: Both ends of the cutout along its extending direction are provided with cutout stop holes communicating with the cutout, and the cutout stop holes penetrate the conductor.

10. An electronic device, characterized in that: The electronic device is applied with the current sensor according to any one of claims 1 to 9.

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