Self-adaptive low-power-consumption magnetic sensor structure and control method

Abstract

The invention provides a self-adaptive low-power-consumption magnetic sensor structure, and the structure comprises a magnetic sensor which is used for detecting a magnetic field signal and outputting a linear response; the low-power-consumption Hall switch is used for detecting whether a magnetic field exists or not and generating a control signal; and the driving tube is connected between the power supply and the magnetic sensor and is controlled by an output signal of the low-power-consumption Hall switch so as to dynamically control the on-off of the power supply of the magnetic sensor. The problem that when a magnetic field does not exist, a linear magnetic sensor still works, and the system current is too large can be solved.

Description

Technical Field

[0001] The present disclosure relates to the field of magnetic sensor control technology, and in particular to an adaptive low-power magnetic sensor structure and a control method. Background Art

[0002] Traditional magnetic sensors (such as linear Hall sensors) require continuous power to monitor magnetic field changes, resulting in high static power consumption. Existing technologies often use periodic sleep schemes to reduce power consumption, but this can lead to issues such as missed signals and delayed responses. For example, when the sensor is in sleep mode, sudden changes in the external magnetic field may not be captured in a timely manner. Furthermore, solutions that rely on software-controlled power switching require an additional microcontroller (MCU), increasing system complexity and cost. Summary of the Invention

[0003] The disclosed embodiments at least provide an adaptive low-power magnetic sensor structure and control method, which can solve the problem of excessive system current when the linear magnetic sensor still works in the absence of a magnetic field.

[0004] The present disclosure provides an adaptive low-power magnetic sensor structure, which includes: A magnetic sensor for detecting a magnetic field signal and outputting a linear response; Low-power Hall effect switches to detect the presence of a magnetic field and generate control signals; The driver tube is used to connect between the power supply and the magnetic sensor and is controlled by the output signal of the low-power Hall switch to dynamically control the power on and off of the magnetic sensor.

[0005] In some embodiments, the driving tube is a PNP or PMOS transistor, whose gate is directly connected to the output end of the low-power Hall switch, the source is connected to the power supply, and the drain is connected to the power supply end of the magnetic sensor.

[0006] In some embodiments, the low power Hall switch includes: Hall element, used to sense magnetic field strength; The voltage comparator is used to compare the voltage signal output by the Hall element with a preset threshold value and output a high / low level signal to control the on or off of the driving tube.

[0007] In some embodiments, the preset threshold is dynamically adjusted via a programmable voltage source.

[0008] In some embodiments, the magnetic sensor is a linear Hall sensor or a magnetoresistive sensor, and its output terminal is connected to the signal processing circuit.

[0009] In some embodiments, when the driving tube is in an off state, the static current of the magnetic sensor is less than 1 μA.

[0010] In some embodiments, a de-jitter circuit is also included, which is connected between the low-power Hall switch and the driving tube to eliminate noise interference of the control signal; the de-jitter circuit is an RC filter circuit or a digital logic delay circuit.

[0011] In some embodiments, when the low-power Hall switch and the magnetic sensor are connected to different power sources, the method further includes: A current limiting circuit is provided between the source and the gate of the driving tube.

[0012] In some embodiments, the structure is integrated into a single chip package, and the low-power Hall switch and the magnetic sensor share the same magnetic field sensing area.

[0013] The present disclosure also provides an adaptive low-power magnetic sensor control method, including: Real-time detection of the presence of an external magnetic field through a low-power Hall switch; When the magnetic field strength exceeds a preset threshold, the driving tube is closed to supply power to the magnetic sensor; When the magnetic field strength is lower than a preset threshold, the driving tube is turned off to cut off the power supply of the magnetic sensor; The magnetic sensor outputs a linear magnetic field detection signal when powered.

[0014] In order to make the above-mentioned objectives, features and advantages of the present disclosure more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. The drawings herein are incorporated into and constitute a part of the specification. These drawings illustrate embodiments consistent with the present disclosure and, together with the specification, are used to illustrate the technical solutions of the present disclosure. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without inventive effort.

[0016] Figure 1 A schematic structural diagram of an adaptive low-power magnetic sensor provided by an embodiment of the present disclosure is shown; Figure 2 A schematic diagram of a magnetic induction chip provided by an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. The components of the embodiments of the present disclosure generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present disclosure provided in the drawings is not intended to limit the scope of the disclosure for which protection is sought, but merely represents selected embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present disclosure.

[0018] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0019] The term "and / or" herein simply describes an association relationship, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, the simultaneous existence of A and B, and the existence of B alone. In addition, the term "at least one" herein refers to any combination of at least two of any one or more of a plurality of items. For example, "at least one of A, B, and C" can represent any one or more elements selected from the set consisting of A, B, and C.

[0020] Based on the above research, the present disclosure provides an adaptive low-power magnetic sensor structure, which uses the output signal of a low-power Hall switch to dynamically control the operation of the magnetic sensor, which can solve the problem of excessive system current when the linear magnetic sensor still works when the magnetic field does not exist.

[0021] like Figure 1 As shown, Figure 1 A schematic diagram of an adaptive low-power magnetic sensor structure provided in an embodiment of the present disclosure, the structure comprising: A magnetic sensor for detecting a magnetic field signal and outputting a linear response; Low-power Hall effect switches to detect the presence of a magnetic field and generate control signals; The driver tube is used to connect between the power supply and the magnetic sensor and is controlled by the output signal of the low-power Hall switch to dynamically control the power on and off of the magnetic sensor.

[0022] Specifically, by using a low-power Hall switch, when the magnetic field strength is higher than the operating point Bop of the Hall switch, the output of the Hall switch becomes a low level, the drive tube path is opened, and the magnetic sensor is powered by power. The magnetic sensor works to detect the magnetic field signal and output a linear response; when the magnetic field strength drops below the release point Brp of the Hall switch, the output of the Hall switch becomes a high level, the drive tube path is closed, and the magnetic sensor is powered off and stops working.

[0023] The magnetic sensor structure provided by the embodiments of the present disclosure can adaptively control the magnetic sensor to stop working when the magnetic field does not exist or is negligible, thereby reducing the power consumption of the system.

[0024] In some embodiments, the driving tube is a PNP or PMOS transistor, whose gate is directly connected to the output end of the low-power Hall switch, the source is connected to the power supply, and the drain is connected to the power supply end of the magnetic sensor.

[0025] Specifically, the driving transistor may be a PNP or PMOS transistor, both of which can realize the function of controlling the power supply of the magnetic sensor by the output level of the Hall switch.

[0026] In some embodiments, the low power Hall switch includes: Hall element, used to sense magnetic field strength; The voltage comparator is used to compare the voltage signal output by the Hall element with a preset threshold value and output a high / low level signal to control the on or off of the driving tube.

[0027] In some embodiments, the preset threshold is dynamically adjusted via a programmable voltage source.

[0028] In some embodiments, the magnetic sensor is a linear Hall sensor or a magnetoresistive sensor, and its output terminal is connected to the signal processing circuit.

[0029] In some embodiments, when the driving tube is in an off state, the static current of the magnetic sensor is less than 1 μA.

[0030] Through the structure provided by the embodiment of the present disclosure, the static current of the magnetic sensor in the non-working state can be less than 1μA, achieving low-power standby.

[0031] In some embodiments, a de-jitter circuit is also included, which is connected between the low-power Hall switch and the driving tube to eliminate noise interference of the control signal; the de-jitter circuit is an RC filter circuit or a digital logic delay circuit.

[0032] Specifically, in order to prevent the Hall switch from precisely controlling the driver tube, a de-bouncing circuit may be added between the Hall switch and the driver tube.

[0033] In some embodiments, when the low-power Hall switch and the magnetic sensor are connected to different power sources, the method further includes: A current limiting circuit is provided between the source and the gate of the driving tube.

[0034] Specifically, when the voltages of the power supplies used by the Hall switch and the magnetic sensor are different, in order to prevent the instantaneous current from being too large, a current limiting circuit is provided between the source and the gate of the driving tube to protect the Hall switch.

[0035] In some embodiments, the structure is integrated into a single chip package, and the low-power Hall switch and the magnetic sensor share the same magnetic field sensing area.

[0036] Specifically, if Figure 2 As shown, the Hall switch C1 and the magnetic sensor C2 are integrated together to ensure that the Hall switch and the magnetic sensor share the same magnetic field sensing area, thereby making the Hall switch control the driving tube instantaneous.

[0037] The present disclosure also provides an adaptive low-power magnetic sensor control method, including: Real-time detection of the presence of an external magnetic field through a low-power Hall switch; When the magnetic field strength exceeds a preset threshold, the driving tube is closed to supply power to the magnetic sensor; When the magnetic field strength is lower than a preset threshold, the driving tube is turned off to cut off the power supply of the magnetic sensor; The magnetic sensor outputs a linear magnetic field detection signal when powered.

[0038] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems and devices described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. In the several embodiments provided in the present disclosure, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0039] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0040] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present disclosure, which are used to illustrate the technical solutions of the present disclosure, rather than to limit them. The scope of protection of the present disclosure is not limited thereto. Although the present disclosure has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed in the present disclosure, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure, and should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure shall be subject to the scope of protection of the claims.

Claims

1. An adaptive low-power magnetic sensor structure, characterized in that: include: A magnetic sensor for detecting a magnetic field signal and outputting a linear response; Low-power Hall effect switches to detect the presence of a magnetic field and generate control signals; The driving tube is used to be connected between the power supply and the magnetic sensor, and is controlled by the output signal of the low-power Hall switch to dynamically control the power on and off of the magnetic sensor.

2. The adaptive low-power magnetic sensor structure according to claim 1, wherein: The driving tube is a PNP or PMOS transistor, a gate of which is directly connected to the output end of the low-power Hall switch, a source of which is connected to a power supply, and a drain of which is connected to the power supply end of the magnetic sensor.

3. The adaptive low-power magnetic sensor structure according to claim 2, wherein: The low-power Hall switch comprises: Hall element, used to sense magnetic field strength; The voltage comparator is used to compare the voltage signal output by the Hall element with a preset threshold value and output a high / low level signal to control the on or off of the driving tube.

4. The adaptive low-power magnetic sensor structure according to claim 3, wherein: The preset threshold is dynamically adjusted by a programmable voltage source.

5. The adaptive low-power magnetic sensor structure according to any one of claims 1 to 4, characterized in that: The magnetic sensor is a linear Hall sensor or a magnetoresistive sensor, and an output end thereof is connected to a signal processing circuit.

6. The adaptive low-power magnetic sensor structure according to claim 5, characterized in that: When the driving tube is in the off state, the static current of the magnetic sensor is less than 1 μA.

7. The adaptive low-power magnetic sensor structure according to claim 1, wherein: It also includes a de-jitter circuit, which is connected between the low-power Hall switch and the driving tube and is used to eliminate noise interference of the control signal; the de-jitter circuit is an RC filter circuit or a digital logic delay circuit.

8. The adaptive low-power magnetic sensor structure according to claim 1, wherein: When the low-power Hall switch and the magnetic sensor are connected to different power sources, the method further includes: A current limiting circuit is provided between the source and the gate of the driving tube.

9. The adaptive low-power magnetic sensor structure according to claim 1, wherein: The structure is integrated into a single chip package, and the low-power Hall switch and the magnetic sensor share the same magnetic field sensing area.

10. An adaptive low-power magnetic sensor control method, characterized in that: include: Real-time detection of the presence of an external magnetic field through a low-power Hall switch; When the magnetic field strength exceeds a preset threshold, the driving tube is closed to supply power to the magnetic sensor; When the magnetic field strength is lower than a preset threshold, the driving tube is turned off to cut off the power supply of the magnetic sensor; The magnetic sensor outputs a linear magnetic field detection signal when powered.

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