Closed-loop Hall sensor with interference shielding performance and Hall detection system

Abstract

The utility model relates to a closed-loop Hall sensor with interference shielding performance and a Hall detection system. The closed-loop Hall sensor comprises a power supply anode end, a power supply cathode end and a signal output end, wherein the power supply anode end and the power supply cathode end are used as alternating current equivalent grounding; the closed-loop Hall sensor also comprises a shielding layer structure used for realizing interference shielding performance. The first end of the shielding layer structure is connected with a power supply anode end or a power supply cathode end in a jumper mode and is used for eliminating interference corresponding to power supply polarity; and the second end of the shielding layer structure is connected with the alternating-current equivalent grounding terminal in a single-point or multi-point connection mode, and is used for eliminating interference corresponding to the frequency. According to the utility model, the shielding layer structure can randomly switch the polarity of the equivalent AC grounding power supply in a jumper mode, the universality of the sensor is improved, and the shielding layer structure is connected with the AC equivalent grounding terminal in a single-point or multi-point connection mode, so that the shielding layer structure can be used for switching the polarity of the equivalent AC grounding power supply in interference environments with different frequencies. And the optimal anti-interference performance is always realized.

Description

Technical Field

[0001] The utility model relates to the technical field of Hall sensors, in particular to a closed-loop Hall sensor with interference shielding performance and a Hall detection system. Background Art

[0002] A closed-loop Hall sensor, also known as a zero-flux Hall current sensor, a zero-flux transformer, or a magnetic balance Hall current sensor, is a high-precision current measurement sensor designed based on the Hall effect and the magnetic balance principle. Its core components include a Hall element, a magnetic core, a secondary compensation winding, and a signal processing circuit, etc. When the primary current passes through the sensor, a magnetic field is generated in the magnetic core. After the Hall element detects this magnetic field, it outputs a corresponding voltage signal. The signal processing circuit amplifies, filters, and linearizes the voltage signal, and then generates a reverse compensation current through the secondary compensation winding to cancel the magnetic field generated by the primary current. Finally, the magnitude of the primary current can be indirectly obtained by measuring the reverse compensation current.

[0003] In the prior art, when measuring the pulse current actually output by a dedicated power supply device with a closed-loop Hall sensor, since the dedicated power supply device radiates strong interference when working in a high-voltage and large-current output circuit, and this interference will affect the output of the Hall sensor, especially interfere with the secondary compensation winding in the closed-loop Hall sensor, affecting the measurement accuracy.

[0004] Currently, to solve the interference phenomenon, the traditional shielding solution is to set a shielding layer outside the secondary compensation winding and eliminate the interference by grounding the shielding layer, or connect the shielding layer to the equivalent AC ground at the power input end of the closed-loop Hall sensor to achieve the effect of eliminating interference.

[0005] However, in the two traditional shielding interference solutions, in the first solution, since an additional grounding terminal needs to be set, the closed-loop Hall sensor needs to design one more grounding port, increasing the production cost. In the second solution, the shielding layer is connected to the equivalent AC ground in a fixed connection manner. That is, the grounding end of the shielding layer is connected to the positive equivalent AC ground, or the grounding end of the shielding layer is connected to the negative equivalent AC ground. However, when the closed-loop Hall sensor in the second solution is applied to an interference environment with power supply polarity, two different models of closed-loop Hall sensors need to be produced to be applied to interference environments with different power supply polarities, complicating the production process of the closed-loop Hall sensor. Especially in the actual application process, when the power supply polarity of the interference environment changes, the entire closed-loop Hall sensor needs to be replaced to shield the changing interference.

[0006] Moreover, in the application process of traditional closed-loop Hall sensors with a shielding layer, due to the fixed grounding method of the shielding layer, when the frequency of interference changes, the anti-interference effect of the shielding layer fails to reach the expected effect.

[0007] Therefore, those skilled in the art urgently need a closed-loop Hall sensor with multi-polarity anti-interference ability and multi-frequency anti-interference ability. Summary of the Utility Model

[0008] (I) Technical Problems to be Solved

[0009] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present utility model provides a closed-loop Hall sensor and a Hall detection system with interference shielding performance, which solve the technical problems of single polarity anti-interference ability and poor multi-frequency anti-interference effect of the closed-loop Hall sensor.

[0010] (II) Technical Solutions

[0011] In order to achieve the above object, the main technical solutions adopted by the present utility model include:

[0012] In the first aspect, an embodiment of the present utility model provides a closed-loop Hall sensor with interference shielding performance, and the closed-loop Hall sensor includes: a positive power supply terminal and a negative power supply terminal for AC equivalent grounding, and a signal output terminal;

[0013] The closed-loop Hall sensor further includes: a shielding layer structure for realizing interference shielding performance; the first end of the shielding layer structure is connected to the positive power supply terminal or the negative power supply terminal in a jumper manner to eliminate interference corresponding to the power supply polarity;

[0014] The second end of the shielding layer structure is connected to the terminal of AC equivalent grounding in a single-point or multi-point connection manner to eliminate interference corresponding to the frequency.

[0015] Optionally, the closed-loop Hall sensor is a three-terminal closed-loop Hall sensor;

[0016] The three-terminal closed-loop Hall sensor includes: a three-terminal connector, a magnetic core, a secondary compensation winding, a shielding layer structure, a shielding ground switching jumper, and a shielding ground number selection jumper;

[0017] The three-terminal connector includes: a positive power supply terminal and a negative power supply terminal for AC equivalent grounding, and a signal output terminal;

[0018] The secondary compensation winding is arranged outside the magnetic core, and the incoming line end of the secondary compensation winding is connected to the signal output terminal;

[0019] The shielding layer structure is arranged outside the secondary side compensation winding. The first end of the shielding layer structure is respectively connected to the magnetic core, the second end of the shielding ground switching jumper, and the second end of the shielding ground quantity selection jumper. The second end of the shielding layer structure is connected to the first end of the shielding ground quantity selection jumper;

[0020] The first end of the shielding ground switching jumper is connected to the positive power supply terminal, and the third end of the shielding ground switching jumper is connected to the negative power supply terminal.

[0021] Optionally, the shielding layer structure is configured to be one of a copper foil shielding layer structure, an FPC shielding layer structure, and a shielding coil winding.

[0022] Optionally, the shielding coil winding is arranged outside the secondary side compensation winding by means of coil winding, and the wire diameter and winding direction of the shielding coil winding are the same as those of the secondary side compensation winding.

[0023] Optionally, the shielding ground switching jumper includes: a first switching jumper pin, a second switching jumper pin, a third switching jumper pin, and a switching jumper cap;

[0024] The first switching jumper pin is connected to the positive power supply terminal;

[0025] The second switching jumper pin is respectively connected to the magnetic core, the incoming line end of the shielding coil winding, and the second end of the shielding ground quantity selection jumper;

[0026] The third switching jumper pin is connected to the negative power supply terminal;

[0027] The switching jumper cap is configured to short-circuit the first switching jumper pin and the second switching jumper pin, or the switching jumper cap is configured to short-circuit the second switching jumper pin and the third switching jumper pin.

[0028] Optionally, the shielding ground quantity selection jumper includes: a first selection jumper pin, a second selection jumper pin, and a selection jumper cap;

[0029] The first selection jumper pin is connected to the outgoing line end of the shielding coil winding;

[0030] The second selection jumper pin is respectively connected to the magnetic core, the incoming line end of the shielding coil winding, and the second switching jumper pin;

[0031] The selection jumper cap is configured to short-circuit the first selection jumper pin and the second selection jumper pin.

[0032] Optionally, when the interference is positive-polarity power supply interference and the frequency is high-frequency interference, the switching jumper cap shorts the second switching jumper pin and the third switching jumper pin, and the selection jumper cap shorts the first selection jumper pin and the second selection jumper pin;

[0033] When the interference is positive-polarity power supply interference and the frequency is low-frequency interference, the switching jumper cap shorts the second switching jumper pin and the third switching jumper pin, and one end of the selection jumper cap is suspended, so that the first selection jumper pin and the second selection jumper pin are disconnected from the short circuit;

[0034] When the interference is negative-polarity power supply interference and the frequency is high-frequency interference, the switching jumper cap shorts the first switching jumper pin and the second switching jumper pin, and the selection jumper cap shorts the first selection jumper pin and the second selection jumper pin;

[0035] When the interference is negative-polarity power supply interference and the frequency is low-frequency interference, the switching jumper cap shorts the first switching jumper pin and the second switching jumper pin, and one end of the selection jumper cap is suspended, so that the first selection jumper pin and the second selection jumper pin are disconnected from the short circuit;

[0036] Wherein, when the frequency of the interference is higher than 1 MHz, it belongs to high-frequency interference, and when the frequency of the interference is lower than 1 MHz, it belongs to low-frequency interference.

[0037] Optionally, the closed-loop Hall sensor is a four-terminal closed-loop Hall sensor;

[0038] The four-terminal closed-loop Hall sensor includes: a four-terminal connector, a magnetic core, a secondary compensation winding, a shielding layer structure, and a shielding ground number selection jumper;

[0039] The four-terminal connector includes: a positive power supply terminal, a negative power supply terminal, a signal output terminal, and a ground terminal;

[0040] The secondary compensation winding is arranged outside the magnetic core, and the incoming line end of the secondary compensation winding is connected to the signal output terminal;

[0041] The shielding layer structure is arranged outside the secondary compensation winding. The first end of the shielding layer structure is respectively connected to the magnetic core, the ground terminal, and the second end of the shielding ground number selection jumper, and the second end of the shielding layer structure is connected to the first end of the shielding ground number selection jumper.

[0042] Optionally, the closed-loop Hall sensor further includes: a Hall element, and a push-pull output circuit connected to the output end of the Hall element;

[0043] The push-pull output circuit includes an operational amplifier, a PNP power transistor, and an NPN power transistor; the differential input terminals of the operational amplifier are connected to the output terminal of the Hall element, the positive terminal of the operational amplifier is respectively connected to the positive power supply terminal and the emitter of the PNP power transistor, the negative terminal of the operational amplifier is respectively connected to the negative power supply terminal and the emitter of the NPN power transistor, the output terminal of the operational amplifier is respectively connected to the base of the PNP power transistor and the base of the NPN power transistor, and the collectors of the PNP power transistor and the NPN power transistor are both connected to the outgoing line terminal of the secondary compensation winding.

[0044] In a second aspect, an embodiment of the present invention provides a Hall detection system including the above-mentioned closed-loop Hall sensor, which further includes:

[0045] An interference detection device for obtaining the polarity information and frequency information of interference in the working environment of the closed-loop Hall sensor.

[0046] (III) Beneficial effects

[0047] For a closed-loop Hall sensor with interference shielding performance provided by the present invention, due to the technical solutions of connecting the shielding layer structure to the positive power supply terminal or the negative power supply terminal serving as the AC equivalent ground by means of jumpers, and the shielding layer structure being connected to the terminals equivalently grounded for AC by means of single-point or multi-point connection, compared with the prior art, it has the following beneficial effects:

[0048] First, in the same closed-loop Hall sensor, the shielding layer structure is connected to the positive power supply terminal or the negative power supply terminal by means of jumpers, so that the shielding layer structure can arbitrarily switch the power supply polarity equivalently grounded for AC, making the closed-loop Hall sensor applicable to any interference environment with polarity and improving the versatility of the closed-loop Hall sensor.

[0049] Second, in the same closed-loop Hall sensor, the shielding layer structure can be connected to the terminals equivalently grounded for AC by means of single-point or multi-point connection, so that the shielding layer structure always has the best anti-interference performance in the interference environment of different frequencies. Description of the drawings

[0050] Figure 1 It is a schematic circuit structure diagram of a three-terminal closed-loop Hall sensor provided by an embodiment of the present invention;

[0051] Figure 2 It is a schematic circuit structure diagram of a four-terminal closed-loop Hall sensor provided by an embodiment of the present invention;

[0052] Figure 3Structural schematic diagram of a shielding ground switching jumper provided by an embodiment of the present utility model;

[0053] Figure 4 Structural schematic diagram of a jumper for shielding ground quantity selection provided by an embodiment of the present utility model. Detailed implementation manners

[0054] In order to better explain the present utility model for easy understanding, the present utility model will be described in detail below with reference to the accompanying drawings through specific implementation manners.

[0055] Reference Figure 1-2 As shown in the figure, a closed-loop Hall sensor with interference shielding performance proposed by an embodiment of the present utility model includes: a positive power supply terminal Uc+ and a negative power supply terminal Uc- for AC equivalent grounding, and a signal output terminal M; the closed-loop Hall sensor further includes: a shielding layer structure for realizing interference shielding performance; the first end of the shielding layer structure is connected to the positive power supply terminal Uc+ or the negative power supply terminal Uc- in a jumper manner to eliminate interference corresponding to the power supply polarity; the second end of the shielding layer structure is connected to the terminal of AC equivalent grounding in a single-point or multi-point connection manner to eliminate interference corresponding to the frequency.

[0056] In the closed-loop Hall sensor of this embodiment, due to the technical solutions of connecting the shielding layer structure to the positive power supply terminal Uc+ or the negative power supply terminal Uc- as AC equivalent ground in a jumper manner, and connecting the shielding layer structure to the terminal of AC equivalent grounding in a single-point or multi-point connection manner, compared with the prior art, it has the following beneficial effects:

[0057] First of all, in the same closed-loop Hall sensor, the shielding layer structure is connected to the positive power supply terminal Uc+ or the negative power supply terminal Uc- in a jumper manner, so that the shielding layer structure can arbitrarily switch the power supply polarity of the equivalent AC ground, making the closed-loop Hall sensor applicable to any interference environment with polarity and improving the versatility of the closed-loop Hall sensor.

[0058] Secondly, in the same closed-loop Hall sensor, the shielding layer structure can be connected to the terminal of AC equivalent grounding in a single-point or multi-point connection manner, so that the shielding layer structure always has the best anti-interference performance in an interference environment with different frequencies.

[0059] To better understand the above technical solution, the exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present utility model can be understood more clearly and thoroughly, and the scope of the present utility model can be fully conveyed to those skilled in the art.

[0060] First, when the closed-loop Hall sensor is a three-terminal closed-loop Hall sensor, the three-terminal closed-loop Hall sensor at least includes: a three-terminal connector CN1, a magnetic core MC, a secondary compensation winding L1, a shielding layer structure, a shielding ground switching jumper JP2, and a shielding ground number selection jumper JP1. The three-terminal connector CN1 includes: a power supply positive terminal Uc+ and a power supply negative terminal Uc- for serving as an AC equivalent ground, and a signal output terminal M. The power supply positive terminal Uc+ and the power supply negative terminal Uc- not only serve as the power supply terminals of the three-terminal closed-loop Hall sensor but also can serve as an AC equivalent ground. The secondary compensation winding L1 is disposed outside the magnetic core MC. The incoming line end A of the secondary compensation winding L1 is connected to the signal output terminal M for outputting the reverse compensation current generated by the secondary compensation winding L1 through the signal output terminal M. The secondary compensation winding L1 is disposed outside the magnetic core MC, and the incoming line end A of the secondary compensation winding L1 is connected to the signal output terminal M. The shielding layer structure is disposed outside the secondary compensation winding L1. The first end of the shielding layer structure is respectively connected to the magnetic core MC, the second end of the shielding ground switching jumper JP2, and the second end of the shielding ground number selection jumper JP1. The second end of the shielding layer structure is connected to the first end of the shielding ground number selection jumper JP1; the first end of the shielding ground switching jumper JP2 is connected to the power supply positive terminal Uc+, and the third end of the shielding ground switching jumper JP2 is connected to the power supply negative terminal Uc-.

[0061] In this embodiment, the shielding layer structure can be selected from a copper foil shielding layer structure, an FPC (Flexible Printed Circuit) shielding layer structure, and a shielding coil winding L2 to achieve the interference shielding performance. When the shielding coil winding L2 is selected as the shielding layer structure, specifically, an enameled wire is wound around the outside of the secondary compensation winding L1 as the shielding coil winding. The wire diameter and winding direction of the shielding coil winding L2 are the same as those of the secondary compensation winding L1. Selecting the shielding coil winding L2 as the shielding layer structure, its structure is easy to implement in production and the production cost is low.

[0062] In this embodiment, the shielding ground switching jumper JP2 includes: a first switching jumper pin E1, a second switching jumper pin E2, a third switching jumper pin E3, and a switching jumper cap G1; the first switching jumper pin E1 is connected to the positive power supply terminal Uc+; the second switching jumper pin E2 is respectively connected to the magnetic core MC, the incoming line end A of the shielding coil winding L2, and the second end of the shielding ground number selection jumper JP1; the third switching jumper pin E3 is connected to the negative power supply terminal Uc-; the switching jumper cap G1 is configured to short-circuit the first switching jumper pin E1 and the second switching jumper pin E2, or the switching jumper cap G1 is configured to short-circuit the second switching jumper pin E2 and the third switching jumper pin E3. The two short-circuiting methods of the switching jumper cap G1 enable the shielding coil winding L2 and the magnetic core MC to be connected to the equivalent AC ground of the positive power supply terminal Uc+ or the negative power supply terminal Uc-, so that the three-terminal closed-loop Hall sensor is applicable to any interference environment with polarity, thereby improving the versatility of the three-terminal closed-loop Hall sensor.

[0063] In this embodiment, the shielding ground number selection jumper JP1 includes: a first selection jumper pin F1, a second selection jumper pin F2, and a selection jumper cap G2; the first selection jumper pin F1 is connected to the outgoing line end B of the shielding coil winding L2; the second selection jumper pin F2 is respectively connected to the magnetic core MC, the incoming line end A of the shielding coil winding L2, and the second switching jumper pin E2; the selection jumper cap G2 is configured to short-circuit the first selection jumper pin F1 and the second selection jumper pin F2. The shielding coil winding L2 realizes single-point connection or multi-point connection with the terminal of the AC equivalent ground through two connection states of the shielding ground number selection jumper JP1 (the selection jumper cap G2 is short-circuited and the selection jumper cap G2 is suspended), so that the shielding coil winding L2 always has the best anti-interference performance in interference environments with different frequencies.

[0064] An explanation of the usage methods of the shielding ground switching jumper JP2 and the shielding ground number selection jumper JP1 in this embodiment is as follows:

[0065] When the interference is positive power supply polarity interference and the frequency is high-frequency interference, the switching jumper cap G1 short-circuits the second switching jumper pin E2 and the third switching jumper pin E3, so that the shielding coil winding L2 is connected to the negative power supply terminal Uc- as the AC equivalent ground to eliminate the positive power supply polarity interference, and the selection jumper cap G2 short-circuits the first selection jumper pin F1 and the second selection jumper pin F2, so that both the incoming line end A and the outgoing line end B of the shielding coil winding L2 are connected to the negative power supply terminal Uc- as the AC equivalent ground to eliminate high-frequency interference.

[0066] When the interference is positive-polarity power supply interference and the frequency is low-frequency interference, the switching jumper cap G1 shorts the second switching jumper pin E2 and the third switching jumper pin E3, connecting the shielding coil winding L2 to the negative terminal Uc- of the power supply, which serves as the AC equivalent ground, to eliminate the positive-polarity power supply interference. One end of the selection jumper cap G2 is left floating, disconnecting the short circuit between the first selection jumper pin F1 and the second selection jumper pin F2 to eliminate low-frequency interference.

[0067] When the interference is negative-polarity power supply interference and the frequency is high-frequency interference, the switching jumper cap G1 shorts the first switching jumper pin E1 and the second switching jumper pin E2, connecting the shielding coil winding L2 to the positive terminal Uc+ of the power supply, which serves as the AC equivalent ground, to eliminate the negative-polarity power supply interference. The selection jumper cap G2 shorts the first selection jumper pin F1 and the second selection jumper pin F2, such that both the incoming end A and the outgoing end B of the shielding coil winding L2 are connected to the negative terminal Uc- of the power supply, which serves as the AC equivalent ground, to eliminate high-frequency interference.

[0068] When the interference is negative-polarity power supply interference and the frequency is low-frequency interference, the switching jumper cap G1 shorts the first switching jumper pin E1 and the second switching jumper pin E2, connecting the shielding coil winding L2 to the positive terminal Uc+ of the power supply, which serves as the AC equivalent ground, to eliminate the negative-polarity power supply interference. One end of the selection jumper cap G2 is left floating, disconnecting the short circuit between the first selection jumper pin F1 and the second selection jumper pin F2 to eliminate low-frequency interference.

[0069] Among them, when the frequency of the interference is higher than 1 MHz, it belongs to high-frequency interference; when the frequency of the interference is lower than 1 MHz, it belongs to low-frequency interference.

[0070] Secondly, when the closed-loop Hall sensor is a four-terminal closed-loop Hall sensor, the four-terminal closed-loop Hall sensor at least includes: a four-terminal connector CN2, a magnetic core MC, a secondary compensation winding L1, a shielding layer structure, and a shielding ground number selection jumper JP1. The four-terminal connector CN2 includes: a positive power supply terminal Uc+, a negative power supply terminal Uc-, a signal output terminal M, and a ground terminal GND; the secondary compensation winding L1 is arranged outside the magnetic core MC, and the incoming end A of the secondary compensation winding L1 is connected to the signal output terminal M; the shielding layer structure is arranged outside the secondary compensation winding L1, the first end of the shielding layer structure is respectively connected to the magnetic core MC, the ground terminal GND, and the second end of the shielding ground number selection jumper JP1, and the second end of the shielding layer structure is connected to the first end of the shielding ground number selection jumper JP1.

[0071] In this embodiment, the terminals of the four-terminal closed-loop Hall sensor include a ground terminal GND. After the shielding layer structure is connected to the ground terminal GND, it can eliminate the interference of any power supply polarity. Therefore, the shielding layer structure does not need to be connected to the equivalent AC ground of the positive power supply terminal U+ or the negative power supply terminal Uc-, thus eliminating the shielding ground switching jumper JP2 in the three-terminal closed-loop Hall sensor. However, a shielding ground quantity selection jumper JP1 is provided in the four-terminal closed-loop Hall sensor. It is arranged between the shielding layer structure and the ground terminal GND. Through two connection methods of the shielding ground quantity selection jumper JP1, single-point connection or multi-point connection between the shielding layer structure and the ground terminal GND is realized, so that the shielding layer structure always has the best anti-interference performance in environments with interference of different frequencies.

[0072] Finally, the closed-loop Hall sensor further includes: a Hall element H, and a push-pull output circuit connected to the output terminal of the Hall element H; the push-pull output circuit includes an operational amplifier U1, a PNP power transistor T1, and an NPN power transistor T2; the differential input terminal of the operational amplifier U1 is connected to the output terminal of the Hall element H, the positive terminal of the operational amplifier U1 is respectively connected to the positive power supply terminal U+ and the emitter of the PNP power transistor T1, the negative terminal of the operational amplifier U1 is respectively connected to the negative power supply terminal Uc- and the emitter of the NPN power transistor T2, the output terminal of the operational amplifier U1 is respectively connected to the base of the PNP power transistor T1 and the base of the NPN power transistor T2, and the collectors of the PNP power transistor T1 and the NPN power transistor T2 are both connected to the outgoing line end B of the secondary compensation winding L1.

[0073] On the other hand, the embodiment of the present invention also proposes a Hall detection system including the above-mentioned closed-loop Hall sensor, which further includes: an interference detection device for obtaining the polarity information and frequency information of the interference in the working environment of the closed-loop Hall sensor. When the staff installs the closed-loop Hall sensor on the power supply device, the interference detection device collects the polarity information and frequency information of the interference generated by the power supply device. Then, based on the polarity information and frequency information, the staff selects the short-circuit method of the shielding ground switching jumper JP2 and the shielding ground quantity selection jumper JP1, so that the closed-loop Hall sensor can specifically eliminate interference of different polarities and different frequencies.

[0074] In summary, the present utility model provides a closed-loop Hall sensor and a Hall detection system with interference shielding performance. When the closed-loop Hall sensor is a three-terminal closed-loop Hall sensor, the three-terminal closed-loop Hall sensor forms four short-circuit modes through the cooperation of two jumper structures (shielding ground switching jumper JP2 and shielding ground number selection jumper JP1), enabling the shielding layer structure in the three-terminal closed-loop Hall sensor to selectively eliminate four types of interference in the environment, which are positive-polarity high-frequency interference, positive-polarity low-frequency interference, negative-polarity high-frequency interference, and negative-polarity low-frequency interference.

[0075] Moreover, when the closed-loop Hall sensor is a four-terminal closed-loop Hall sensor, after the ground terminal GND of the four-terminal closed-loop Hall sensor is connected to the shielding layer structure, it can eliminate interference of any power supply polarity. And through two short-circuit modes formed by the shielding ground number selection jumper JP1, single-point connection or multi-point connection between the shielding layer structure and the ground terminal GND is realized, enabling the shielding layer structure to always have the best anti-interference performance in an environment with interference of different frequencies.

[0076] Those skilled in the art should understand that the embodiments of the present utility model can be provided as methods, systems, or computer program products. Therefore, the present utility model can be implemented in the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present utility model can be implemented in the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program codes.

[0077] The present utility model is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present utility model. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as the combination of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions.

[0078] It should be noted that in the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" placed before a component does not exclude the presence of a plurality of such components. The present utility model can be implemented by means of hardware including several different components and by means of a properly programmed computer. In the claims listing several devices, several of these devices can be embodied by the same hardware. The use of the words first, second, third, etc. is only for convenience of expression and does not indicate any order. These words can be understood as part of the component name.

[0079] In addition, it should be noted that in the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0080] Although the preferred embodiments of the present utility model have been described, those skilled in the art can make additional changes and modifications after learning the basic creative concepts. Therefore, the claims should be construed to include the preferred embodiments and all changes and modifications falling within the scope of the present utility model.

[0081] Obviously, those skilled in the art can make various modifications and variations to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and its equivalent technologies, the present utility model should also include these modifications and variations.

Claims

1. A closed-loop Hall sensor with interference shielding performance, characterized in that, The closed-loop Hall sensor includes a positive power supply terminal and a negative power supply terminal for AC equivalent grounding, and a signal output terminal; The closed-loop Hall sensor further includes a shielding layer structure for achieving interference shielding performance; the first end of the shielding layer structure is connected to the positive power supply terminal or the negative power supply terminal in a jumper manner to eliminate interference corresponding to the power supply polarity; The second end of the shielding layer structure is connected to the terminal for AC equivalent grounding in a single-point or multi-point connection manner to eliminate interference corresponding to the frequency.

2. The closed-loop Hall sensor according to claim 1, characterized in that, The closed-loop Hall sensor is a three-terminal closed-loop Hall sensor; The three-terminal closed-loop Hall sensor includes a three-terminal connector, a magnetic core, a secondary compensation winding, a shielding layer structure, a shielding ground switching jumper, and a shielding ground quantity selection jumper; The three-terminal connector includes a positive power supply terminal and a negative power supply terminal for AC equivalent grounding, and a signal output terminal; The secondary compensation winding is arranged outside the magnetic core, and the incoming line end of the secondary compensation winding is connected to the signal output terminal; The shielding layer structure is arranged outside the secondary compensation winding. The first end of the shielding layer structure is respectively connected to the magnetic core, the second end of the shielding ground switching jumper, and the second end of the shielding ground quantity selection jumper. The second end of the shielding layer structure is connected to the first end of the shielding ground quantity selection jumper; The first end of the shielding ground switching jumper is connected to the positive power supply terminal, and the third end of the shielding ground switching jumper is connected to the negative power supply terminal.

3. The closed-loop Hall sensor according to claim 2, characterized in that, The shielding layer structure is configured as one of a copper foil shielding layer structure, an FPC shielding layer structure, and a shielding coil winding.

4. The closed-loop Hall sensor according to claim 3, wherein, The shielding coil winding is arranged outside the secondary compensation winding by means of coil winding, and the wire diameter and winding direction of the shielding coil winding are the same as those of the secondary compensation winding.

5. The closed-loop Hall sensor according to claim 4, characterized in that, The shielding ground switching jumper includes a first switching jumper pin, a second switching jumper pin, a third switching jumper pin, and a switching jumper cap; The first switching jumper pin is connected to the positive power supply terminal; The second switching jumper pin is respectively connected to the magnetic core, the incoming line end of the shielding coil winding, and the second end of the shielding ground quantity selection jumper; The third switching jumper pin is connected to the negative power supply terminal; The switching jumper cap is configured to short-circuit the first switching jumper pin and the second switching jumper pin, or the switching jumper cap is configured to short-circuit the second switching jumper pin and the third switching jumper pin.

6. The closed-loop Hall sensor according to claim 5, characterized in that, The shielding ground quantity selection jumper includes a first selection jumper pin, a second selection jumper pin, and a selection jumper cap; The first selection jumper pin is connected to the outgoing line end of the shielding coil winding; The second selection jumper pin is respectively connected to the magnetic core, the incoming line end of the shielding coil winding, and the second switching jumper pin; The selection jumper cap is configured to short-circuit the first selection jumper pin and the second selection jumper pin.

7. The closed-loop Hall sensor according to claim 6, wherein When the interference is positive-polarity power supply interference and the frequency is high-frequency interference, the switching jumper cap shorts the second switching jumper pin and the third switching jumper pin, and the selection jumper cap shorts the first selection jumper pin and the second selection jumper pin; When the interference is positive-polarity power supply interference and the frequency is low-frequency interference, one end of the selection jumper cap is suspended, disconnecting the short circuit between the first selection jumper pin and the second selection jumper pin while the switching jumper cap shorts the second switching jumper pin and the third switching jumper pin; When the interference is negative-polarity power supply interference and the frequency is high-frequency interference, the switching jumper cap shorts the first switching jumper pin and the second switching jumper pin, and the selection jumper cap shorts the first selection jumper pin and the second selection jumper pin; When the interference is negative-polarity power supply interference and the frequency is low-frequency interference, one end of the selection jumper cap is suspended, disconnecting the short circuit between the first selection jumper pin and the second selection jumper pin while the switching jumper cap shorts the first switching jumper pin and the second switching jumper pin; Among them, when the frequency of the interference is higher than 1 MHz, it belongs to high-frequency interference, and when the frequency of the interference is lower than 1 MHz, it belongs to low-frequency interference.

8. The closed-loop Hall sensor according to claim 2, wherein The closed-loop Hall sensor is a four-terminal closed-loop Hall sensor; The four-terminal closed-loop Hall sensor includes: a four-terminal connector, a magnetic core, a secondary compensation winding, a shielding layer structure, and a shielding ground number selection jumper; The four-terminal connector includes: a positive power supply terminal, a negative power supply terminal, a signal output terminal, and a ground terminal; The secondary compensation winding is arranged outside the magnetic core, and the incoming line end of the secondary compensation winding is connected to the signal output terminal; The shielding layer structure is arranged outside the secondary compensation winding. The first end of the shielding layer structure is respectively connected to the magnetic core, the ground terminal, and the second end of the shielding ground number selection jumper, and the second end of the shielding layer structure is connected to the first end of the shielding ground number selection jumper.

9. The closed-loop Hall sensor according to claim 8, wherein, The closed-loop Hall sensor further includes: a Hall element, and a push-pull output circuit connected to the output end of the Hall element; The push-pull output circuit includes an operational amplifier, a PNP power transistor, and an NPN power transistor; the differential input end of the operational amplifier is connected to the output end of the Hall element, the positive terminal of the operational amplifier is respectively connected to the positive power supply terminal and the emitter of the PNP power transistor, the negative terminal of the operational amplifier is respectively connected to the negative power supply terminal and the emitter of the NPN power transistor, the output end of the operational amplifier is respectively connected to the base of the PNP power transistor and the base of the NPN power transistor, and the collectors of the PNP power transistor and the NPN power transistor are both connected to the outgoing line end of the secondary compensation winding.

10. A Hall detection system including the closed-loop Hall sensor according to any one of the above claims 1-9, characterized in that, It further includes: An interference detection device for obtaining the polarity information and frequency information of the interference in the working environment of the closed-loop Hall sensor.

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