Magnetic switch with filtering function

Abstract

The present application discloses a magnetic switch with filtering functionality. [Solution] The magnetic switch includes a magnetic sensing module and a specific integrated circuit. The specific integrated circuit includes a power module, a comparison module, a filtering module, and a logic operation module. The output end of the magnetic sensing module is electrically connected to the input end of the comparison module. The filtering module is electrically connected between the output end of the comparison module and the input end of the logic operation module. Or, the filtering module is electrically connected between the output end of the magnetic sensing module and the input end of the logic operation module. The present application provides a highly integrated magnetic switch, which not only has high frequency response and the characteristics of a conventional magnetic switch, but also can set a switching frequency threshold by the filtering module, so that the highly integrated magnetic switch can output high and low level change signals within the set switching frequency range. Therefore, the present application not only avoids the invalid effect of the magnetic switch under the influence of vibration or other environments, but also reduces power consumption and cost.

Description

[Technical field]

[0001] The present application relates to the technical field of magnetic switches, and more particularly to magnetic switches with filtering capabilities. [Background technology]

[0002] Magnetic switches are widely used in areas such as position and speed sensing. These switches work by monitoring the position and speed of a magnet attached to a moving object, thereby providing feedback regarding the object's position and speed status.

[0003] Conventional magnetic switches operate within a frequency response range of DC to 100KHz. In some specialties, to prevent interference from vibration, false triggering, and other confusing signals, it is required that the magnetic switch only respond within a specific frequency range, such as 10Hz to 100Hz, DC to 3Hz, or 100Hz to 100KHz.

[0004] Currently, mainstream applications employ digital algorithms in MCUs to perform band-pass, low-pass, or high-pass filtering on the switch's output signal, which presents the problems of high power consumption and rising costs. Summary of the Invention [Problem to be solved by the invention]

[0005] The present application provides a magnetic switch with filtering function to address the high cost issue. [Means for solving the problem]

[0006] According to one aspect of the present application, there is provided a magnetic switch with filtering capabilities, comprising: a magnetic sensing module adapted to generate a magnetic field sensing signal based on variations in magnetic flux; a specific integrated circuit electrically connected to the magnetic sensing module, which is used to receive a magnetic field sensing signal from the magnetic sensing module and generate a high or low level switching signal based on the magnetic field sensing signal; Equipped with A specific integrated circuit includes a power supply module, a comparison module, a filtering module, and a logic operation module; a power supply module electrically connected to the magnetic sensing module, the comparison module, the filtering module, and the logic operation module, respectively, for providing power to each of these modules; an output end of the magnetic sensing module electrically connected to an input end of the comparison module; A magnetic switch with filtering function is provided, in which the filtering module is electrically connected between the output end of the comparison module and the input end of the logic module, or the filtering module is electrically connected between the output end of the magnetic sensing module and the input end of the comparison module, and the output end of the comparison module is electrically connected to the input end of the logic module.

[0007] In this application, a magnetic switch with filtering function is proposed. The magnetic sensing module outputs a voltage signal based on the external magnetic field environment, while the specific integrated circuit performs a threshold comparison on the voltage signal and outputs a high or low level switching signal. The specific integrated circuit continuously monitors the frequency of the switching signal and outputs only the switching signal with a frequency within the set threshold. When the switching frequency is outside the set threshold, the output signal is locked to a high or low level. This application provides a highly integrated magnetic switch characterized by high frequency response. The highly integrated magnetic switch not only has the characteristics of a conventional magnetic switch, but can also set the switching frequency threshold by the filtering module, so that the highly integrated magnetic switch can output high and low level changing signals within the set switching frequency range. Therefore, this application not only avoids the invalid effect of the magnetic switch under the influence of vibration or other environments, but also lowers the power consumption and cost.

[0008] It should be understood that the material described in this section is not intended to identify key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become more readily apparent through the following description.

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can derive additional drawings based on these drawings without creative work. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a schematic diagram of a magnetic switch with filtering provided in an embodiment of the present application. [Diagram 2] FIG. 1 is a schematic diagram of another filtered magnetic switch provided in an embodiment of the present application. [Diagram 3] FIG. 13 is a schematic diagram of yet another magnetic switch with filtering function provided in an embodiment of the present application. [Figure 4] FIG. 1 is a schematic diagram of another filtered magnetic switch provided in an embodiment of the present application. [Diagram 5] FIG. 13 is a schematic diagram of yet another magnetic switch with filtering function provided in an embodiment of the present application. [Figure 6] FIG. 1 is a schematic diagram of another filtered magnetic switch provided in an embodiment of the present application. [Figure 7] FIG. 2 is a schematic diagram of a magnetic sensor. [Figure 8] FIG. 4 is a schematic diagram of another magnetic sensor. [Figure 9] FIG. 13 is a schematic diagram of yet another magnetic sensor. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] In order to facilitate those skilled in the art to better understand the solutions presented in this application, the following description, together with the accompanying drawings, provides a clear and complete description of the technical solutions in the embodiments of this application. It is apparent that the described embodiments are only a part of the embodiments of this application and do not encompass all the embodiments. All other embodiments that can be derived by those skilled in the art based on the embodiments of this application without creative efforts should fall within the scope of protection of the present invention.

[0012] It should be noted that the terms "first", "second" and similar designations used in the specification and claims, as well as in the accompanying drawings, are intended to distinguish between similar objects and do not necessarily refer to a particular order or sequence. It should be understood that such data may be interchanged, where appropriate, to allow the embodiments of the present application described herein to be implemented in an order other than that illustrated or described herein. Moreover, the terms "comprising" and "having", along with their variations, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device comprising a series of steps or units is not limited to only those explicitly recited, but may also include additional steps or units that are inherent to such a process, method, product, or device, even if not explicitly stated.

[0013] FIG. 1 is a schematic diagram of a magnetic switch with filtering provided in an embodiment of the present application. FIG. 2 is a schematic diagram of another magnetic switch with filtering provided in an embodiment of the present application. FIG. 3 is a schematic diagram of another magnetic switch with filtering provided in an embodiment of the present application. As shown in FIG. 1 to FIG. 3, the magnetic switch with filtering includes a magnetic sensing module 1 used to generate a magnetic field sensing signal based on a variation in magnetic flux, and a specific integrated circuit 2 electrically connected to the magnetic sensing module 1 used to receive the magnetic field sensing signal from the magnetic sensing module 1 and generate a high or low level switching signal based on the magnetic field sensing signal. The specific integrated circuit 2 includes a power supply module 21, a comparison module 22, a filtering module 23, and a logic operation module 24. The power supply module 21 is electrically connected to the magnetic sensing module 1, the comparison module 22, the filtering module 23, and the logic operation module 24 to provide power to each of these modules. 2, the output end of the magnetic sensing module 1 is electrically connected to the input end of the comparison module 22, and the filtering module 23 is electrically connected between the output end of the comparison module 22 and the input end of the logic operation module 24. Alternatively, as shown in FIG. 3, the filtering module 23 is electrically connected between the output end of the magnetic sensing module 1 and the input end of the comparison module 22, while the output end of the comparison module 22 is electrically connected to the input end of the logic operation module 24.

[0014] In this embodiment, the output end of the magnetic sensing module 1 is electrically connected to the input end of the specific integrated circuit 2. The magnetic sensing module 1 senses the magnetic field in its environment based on the variation of magnetic flux, and outputs the generated magnetic field sensing signal to the specific integrated circuit 2. The specific integrated circuit 2 is designed to receive the magnetic field sensing signal from the magnetic sensing module 1, and generate a high or low level switching signal based on the magnetic field sensing signal. The output end of the specific integrated circuit 2 is a magnetic switch output end Vout, which is used to output the high or low level switching signal generated by the specific integrated circuit 2 according to the magnetic field sensing signal.

[0015] The specific integrated circuit 2 includes a power supply module 21, a comparison module 22, a filtering module 23 and a logic operation module 24. The specific integrated circuit 2 has a filtering function, which is specially designed to receive the magnetic field sensing signal from the magnetic sensing module 1, perform filtering, comparison and logic operation, and finally output a high or low level switching signal.

[0016] The power supply module 21 is electrically connected to the magnetic sensing module 1, the comparison module 22, the filtering module 23, and the logic operation module 24, and provides power to each of these modules. The optional power supply module 21 is a power circuit capable of independently supplying power to each module. It specifically receives the Vin signal provided by an external power source, converts the Vin signal into multiple voltage signals required by the various modules, and then supplies these multiple voltage signals to each module, where the voltage requirements can be the same or different for each module. The magnetic sensing module 1 also features a power input end, which is electrically connected to the power supply module 21. The power supply module 21 supplies power to the magnetic sensing module 1 through this power input end, and the output voltage signal from the magnetic sensing module 1 is addressed to either the comparison module 22 or the filtering module 23 of a particular integrated circuit 2. The power supply module 21 not only supplies power to the comparison module 22, but also provides the comparison module 22 with a reference voltage VREF for comparison.

[0017] The filtering module 23 may be configured with a filtering frequency threshold. When the switching frequency received by the filtering module 23 falls within the set filtering frequency threshold, the filtering module 23 outputs a varying high or low signal. Conversely, when the switching frequency received by the filtering module 23 exceeds the set filtering frequency threshold, the output of the filtering module 23 remains in a constant low or high state.

[0018] The comparison module 22 includes a comparator, which is used to compare the input signals and output the comparison result. The logic operation module 24 serves to perform logic operations on the input signals and output the operation result.

[0019] 2, the output end of the magnetic sensing module 1 is electrically connected to the input end of the comparison module 22, and the filtering module 23 is electrically connected between the output end of the comparison module 22 and the input end of the logic operation module 24. The specific integrated circuit 2 is designed to receive the magnetic field sensing signal from the magnetic sensing module 1, perform comparison, filtering and logic operation, and finally output a high or low level switching signal.

[0020] As shown in Fig. 3, the filtering module 23 is electrically connected between the output end of the magnetic sensing module 1 and the input end of the comparing module 22. The output end of the comparing module 22 is electrically connected to the input end of the logic operation module 24, and the output end of the logic operation module 24 is electrically connected to the magnetic switch output end Vout. The specific integrated circuit 2 is designed to receive the magnetic field sensing signal from the magnetic sensing module 1, perform filtering, comparison and logic operation, and finally output a high or low level switching signal.

[0021] In the embodiment of the present application, a magnetic switch with filtering function is proposed. The magnetic sensing module outputs a voltage signal based on the external magnetic field environment, while the specific integrated circuit performs a threshold comparison on the voltage signal and outputs a high or low level switching signal. The specific integrated circuit continuously monitors the frequency of the switching signal and outputs only the switching signal with a frequency within the set threshold. When the switching frequency is outside the set threshold, the output signal is locked to a high or low level. The highly integrated magnetic switch provided in the embodiment of the present application is characterized by high frequency response. The highly integrated magnetic switch not only has the characteristics of a conventional magnetic switch, but can also set a switching frequency threshold by the filtering module, so that the highly integrated magnetic switch can output high and low level changing signals within the set switching frequency range. Therefore, the present application not only avoids the invalid effect of the magnetic switch under the influence of vibration or other environments, but also reduces the power consumption and cost.

[0022] 4 is a schematic diagram of another magnetic switch with filtering function provided in an embodiment of the present application. As shown in FIG. 4, the filtering module 23 is electrically connected between the output end of the comparison module 22 and the input end of the logic operation module 24. The filtering module 23 includes a low-power oscillator 231, a first adjustable counter 232, a VDD programmable digital circuit 233, and a second adjustable counter 234. The low-power oscillator 231 is electrically connected to the first adjustable counter 232 and the second adjustable counter 234, respectively. The VDD programmable digital circuit 233 is electrically connected to the first adjustable counter 232 and the second adjustable counter 234, respectively, while the first adjustable counter 232 and the second adjustable counter 234 are electrically connected to the logic operation module 24, respectively.

[0023] In this embodiment, the filtering module 23 includes a low-power oscillator 231, a first adjustable counter 232, a VDD programmable digital circuit 233, and a second adjustable counter 234. The low-power oscillator 231 is electrically connected to the first adjustable counter 232 and the second adjustable counter 234, respectively. The VDD programmable digital circuit 233 is electrically connected to the first adjustable counter 232 and the second adjustable counter 234, respectively. The output end of the comparison module 22 is electrically connected to the first adjustable counter 232 and the second adjustable counter 234, respectively, while the first adjustable counter 232 and the second adjustable counter 234 are electrically connected to the input end of the logic operation module 24, respectively. The output end of the comparison module 22 is also electrically connected to the logic operation module 24. The optional logic operation module 24 is an AND gate logic circuit.

[0024] When there is a periodic change in the external magnetic field, the magnetic sensing module 1 detects the fluctuation of the magnetic field and sends the obtained magnetic field sensing signal to the comparison module 22. The comparison module 22 processes the signal and outputs a high or low level corresponding to the periodic magnetic field change. The output signal from the comparison module 22 is sent to the first adjustable counter 232 and the second adjustable counter 234, respectively.

[0025] The function of the adjustable counter is to count within the oscillator reset signal period. This count corresponds to the frequency of the high or low level signal output by the comparison module 22, in particular counting the occurrence of these signals. The VDD programmable digital circuit 233 is used to set the reference values ​​for the adjustable counters to achieve a specified output frequency. In particular, a set high value can be specified for the first adjustable counter 232, while a set low value can be specified for the second adjustable counter 234.

[0026] If the frequency of the high or low level signal output by the comparison module 22 exceeds the set high value, the first adjustable counter 232 counts a number greater than the set high value within one oscillator cycle, resulting in a low output signal from the first adjustable counter 232.

[0027] If the frequency of the high or low level signal output by the comparison module 22 is lower than the set low value, the second adjustable counter 234 counts a number less than the set low value within one oscillator cycle, leading to a low output signal from the second adjustable counter 234.

[0028] If the frequency of the high or low level signal output by the comparison module 22 falls within the range defined by the set low and high values, the first adjustable counter 232 will count a number less than the set high value in one oscillator cycle, resulting in a high output signal from the first adjustable counter 232. At the same time, the second adjustable counter 234 will count a number greater than the set low value in one oscillator cycle, leading to a high output signal from the second adjustable counter 234.

[0029] As explained above, when either the first adjustable counter 232 or the second adjustable counter 234 outputs a low signal, the logic operation module 24 sets the Vout terminal to a low level. When both the first adjustable counter 232 and the second adjustable counter 234 output a high signal, the logic operation module 24 sends the signal output from the comparison module 22 to the Vout terminal.

[0030] FIG. 5 is a schematic diagram of another magnetic switch with filtering function provided in an embodiment of the present application. As shown in FIG. 5, the filtering module 23 is electrically connected between the output end of the comparison module 22 and the input end of the logic operation module 24. The filtering module 23 includes a VDD programmable digital circuit 235 and a first filtering unit 236 and a second filtering unit 237 connected in parallel. The first filtering unit 236 includes a first adjustable current source U1, an NMOS switch M1, a first Schmitt trigger SH1, and a first capacitor C1. The second filtering unit 237 includes a second adjustable current source U2, a PMOS switch M2, a second Schmitt trigger SH2, and a second capacitor C2. For each filtering unit, the adjustable current source is electrically connected between the VDD programmable digital circuit 235 and the MOS switch. The control end of the MOS switch is electrically connected to the comparison module, while the first end of the capacitor is connected between the adjustable current source and the MOS switch and the second end of the capacitor is grounded. The input end of the Schmitt trigger is connected between the adjustable current source and the MOS switch and the output end of the Schmitt trigger is connected to the logic operation module 24.

[0031] In this embodiment, the first filtering unit 236 includes a first adjustable current source U1, an NMOS switch M1, a first Schmitt trigger SH1, and a first capacitor C1. The control end of the NMOS switch M1 is electrically connected to the output end of the comparison module 22. The first end of the NMOS switch M1 is grounded, while the second end is electrically connected to the first end of the first adjustable current source U1. The second end of the first adjustable current source U1 is electrically connected to a DC power supply, and the third end is electrically connected to the VDD programmable digital circuit 235. The first end of the first capacitor C1 is electrically connected to the second end of the NMOS switch M1, and the second end of the first capacitor C1 is grounded. The input end of the first Schmitt trigger SH1 is electrically connected to the second end of the NMOS switch M1, and the output end of the first Schmitt trigger SH1 is electrically connected to the input end of the logic operation module 24.

[0032] The second filtering unit 237 comprises a second adjustable current source U2, a PMOS switch M2, a second Schmitt trigger SH2, and a second capacitor C2. The control end of the PMOS switch M2 is electrically connected to the output end of the comparison module 22. The first end of the PMOS switch M2 is electrically connected to a DC power supply, while the second end is electrically connected to the first end of the second adjustable current source U2. The second end of the second adjustable current source U2 is grounded, and the third end is electrically connected to the VDD programmable digital circuit 235. The first end of the second capacitor C2 is electrically connected to the second end of the PMOS switch M2, and the second end of the second capacitor C2 is grounded. The input end of the second Schmitt trigger SH2 is electrically connected to the second end of the PMOS switch M2, and the output end of the second Schmitt trigger SH2 is electrically connected to the input end of the logic operation module 24.

[0033] The output end of the comparison module 22 is also electrically connected to a logic operation module 24. The optional logic operation module 24 is an AND gate logic circuit.

[0034] When there is a periodic change in the external magnetic field, the magnetic sensing module 1 detects the fluctuation of the magnetic field and sends the obtained magnetic field sensing signal to the comparison module 22. The comparison module 22 processes this signal and outputs a high or low level corresponding to the periodic magnetic field change. The output signal from the comparison module 22 is sent to the control ends of the NMOS switch M1 and the PMOS switch M2, respectively. The function of the NMOS switch M1 and the PMOS switch M2 is to charge and discharge the subsequent load capacitor according to different switching frequencies. When the output signal from the comparison module 22 is at a high level, the NMOS switch M1 is turned on and the PMOS switch M2 is turned off. Conversely, when the output signal from the comparison module 22 is at a low level, the NMOS switch M1 is turned off and the PMOS switch M2 is turned on.

[0035] The first adjustable current source U1 and the second adjustable current source U2 act as active loads for the load capacitors. The VDD programmable digital circuit 235 is used to set reference values ​​for the adjustable current sources to achieve a specified output frequency. In particular, a set high value can be specified for the first filtering unit 236, while a set low value can be specified for the second filtering unit 237.

[0036] When the frequency of the high or low level signal output by the comparison module 22 exceeds the set high value, the current through the NMOS switch M1 becomes greater than the current through the second adjustable current source U2, causing the second Schmitt trigger SH2 to output a low signal.

[0037] When the frequency of the high or low level signal output by the comparison module 22 is below the set low value, the current through the PMOS switch M2 becomes smaller than the current through the first adjustable current source U1, causing the first Schmitt trigger SH1 to output a low signal.

[0038] If the frequency of the high or low level signal output by the comparison module 22 falls within the range defined by the set low and high values, both the first Schmitt trigger SH1 and the second Schmitt trigger SH2 will output a high signal.

[0039] As explained above, when either the first Schmitt trigger SH1 or the second Schmitt trigger SH2 outputs a low signal, the logic operation module 24 sets the Vout terminal to a low level. When both the first Schmitt trigger SH1 and the second Schmitt trigger SH2 output a high signal, the logic operation module 24 sends the signal output from the comparison module 22 to the Vout terminal.

[0040] 6 is a schematic diagram of another magnetic switch with filtering function provided in an embodiment of the present application. As shown in FIG. 6, the filtering module 23 is electrically connected between the output end of the magnetic sensing module 1 and the input end of the comparison module 22. The filtering module 23 includes a VDD programmable digital circuit 238 and an adjustable bandpass filter 239 electrically connected thereto, and the output end of the adjustable bandpass filter 239 is electrically connected to the comparison module 22.

[0041] In this embodiment, the filtering module 23 includes a VDD programmable digital circuit 238 and an adjustable band-pass filter 239 electrically connected to each other. An input end of the adjustable band-pass filter 239 is connected to an output end of the magnetic sensing module 1, while an output end of the adjustable band-pass filter 239 is electrically connected to an input end of the comparison module 22. Also, an output end of the comparison module 22 is electrically connected to an input end of the logic operation module 24.

[0042] When there is a periodic change in the external magnetic field, the magnetic sensing module 1 detects the magnetic field fluctuations and sends the sensed magnetic field signal to the adjustable bandpass filter 239 of the filtering module 23. The VDD programmable digital circuit 238 is used to set the frequency range of the adjustable bandpass filter 239 and enable the functionality of setting low pass, high pass, or band pass frequencies. In particular, a set high value can be specified for the first filtering unit 236, while a set low value can be specified for the second filtering unit 237.

[0043] If the magnetic field detection signal output by the magnetic detection module 1 falls within the frequency range of the adjustable bandpass filter 239, the magnetic field detection signal will not be attenuated when it passes through the adjustable bandpass filter 239, allowing the magnetic field detection signal to effectively trigger the comparison module 22, which then toggles.

[0044] If the magnetic field detection signal output by the magnetic detection module 1 is outside the frequency range of the adjustable bandpass filter 239, the magnetic field detection signal will be attenuated when passing through the adjustable bandpass filter 239, rendering the attenuated magnetic field detection signal unable to trigger the comparison module 22, and the comparison module 22 will not toggle.

[0045] As explained above, when the comparison module 22 outputs a low signal, the logic operation module 24 sets the Vout terminal to a low level, and when the comparison module 22 outputs a high signal, the logic operation module 24 sends the signal output from the comparison module 22 to the Vout terminal.

[0046] In any of the above embodiments, the number of optional filtering modules is at least one, and the at least one filtering module is used to perform a filtering operation over at least one range.

[0047] The optional magnetic sensing module includes at least one magnetic sensor, which may be a Hall sensor, an anisotropic magnetoresistance sensor, a giant magnetoresistance sensor, or a tunneling magnetoresistance sensor. Any magnetic sensor suitable for the magnetic switch in the embodiments of the present application, without being limited thereto, falls within the scope of protection of the present application, and there is no limit to the number of magnetic sensors in the magnetic sensing module.

[0048] The circuit structure of at least one optional magnetic sensor is of a single resistor, half bridge, or full bridge configuration. FIG. 7 is a schematic diagram of a magnetic sensor. As shown in FIG. 7, the magnetic sensor includes a single resistor R configured in a single resistor configuration, whose voltage output end sends a magnetic field sensing signal. FIG. 8 is a schematic diagram of another magnetic sensor. As shown in FIG. 8, the sensor includes two resistors R1 and R2 arranged in a half bridge configuration, whose voltage output end provides a magnetic field sensing signal. FIG. 9 is a schematic diagram of yet another magnetic sensor. As shown in FIG. 9, the magnetic sensor consists of four resistors R11-R14 configured in a full bridge configuration, whose two voltage output ends V+ and V- send a differential signal representing the magnetic field sensing signal.

[0049] It should be understood that various forms of the above exemplified processes may be utilized, and steps may be rearranged, added, or removed. For example, various modules described in this application may be performed in parallel, serially, or in different orders, as long as they achieve the desired results of the technical solutions presented in this application, and no limitations are made in this specification in this regard.

[0050] The specific embodiments described above do not constitute limitations on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made based on design requirements and other factors. Any modifications, equivalent replacements, and improvements made within the spirit and principles of this application shall be included in the scope of protection of this application.

Claims

1. A magnetic switch having a filtering function, a magnetic sensing module adapted to generate a magnetic field sensing signal based on variations in magnetic flux; a specific integrated circuit electrically connected to the magnetic sensing module, the specific integrated circuit being used to receive the magnetic field sensing signal from the magnetic sensing module and generate a high or low level switching signal based on the magnetic field sensing signal; Equipped with The particular integrated circuit comprises a power supply module, a comparison module, a filtering module, and a logic operation module; the power supply module is electrically connected to the magnetic sensing module, the comparison module, the filtering module, and the logic operation module, respectively, for providing power to each of these modules; The output end of the magnetic detection module is electrically connected to the input end of the comparison module, and the filtering module is electrically connected between the output end of the comparison module and the input end of the logic operation module, or the filtering module is electrically connected between the output end of the magnetic detection module and the input end of the comparison module, and the output end of the comparison module is electrically connected to the input end of the logic operation module. A magnetic switch having a filtering function, comprising:

2. the filtering module is electrically connected between the output end of the comparison module and the input end of the logic operation module; The filtering module includes a low power oscillator, a first adjustable counter, a VDD programmable digital circuit, and a second adjustable counter, the low power oscillator is electrically connected to the first adjustable counter and the second adjustable counter, respectively, the VDD programmable digital circuit is electrically connected to the first adjustable counter and the second adjustable counter, respectively, and the first adjustable counter and the second adjustable counter are electrically connected to the logic operation module.

2. The magnetic switch with filtering function according to claim 1 .

3. the filtering module is electrically connected between the output end of the comparison module and the input end of the logic operation module; the filtering module includes a VDD programmable digital circuit and first and second filtering units connected in parallel, the first filtering unit comprising a first adjustable current source, an NMOS switch, a first Schmitt trigger, and a first capacitor, while the second filtering unit comprises a second adjustable current source, a PMOS switch, a second Schmitt trigger, and a second capacitor; For any filtering unit, the adjustable current source is electrically connected between the VDD programmable digital circuit and the MOS switch, and the control end of the MOS switch is electrically connected to the comparison module, while the first end of the capacitor is connected between the adjustable current source and the MOS switch, the second end of the capacitor is grounded, the input end of the Schmitt trigger is connected between the adjustable current source and the MOS switch, and the output end of the Schmitt trigger is electrically connected to the logic operation module.

2. The magnetic switch with filtering function according to claim 1 .

4. the filtering module is electrically connected between the output end of the magnetic sensing module and the input end of the comparison module; The filtering module includes a VDD programmable digital circuit and an adjustable bandpass filter electrically connected, the input end of the adjustable bandpass filter being electrically connected to the comparison module.

2. The magnetic switch with filtering function according to claim 1 .

5. 2. The magnetic switch with filtering function according to claim 1, wherein the number of said filtering modules is at least one, and the at least one filtering module is used to perform a filtering operation over at least one range.

6. The magnetic switch with filtering capability of claim 1 , wherein the magnetic sensing module comprises at least one magnetic sensor.

7. 7. The magnetic switch with filtering function according to claim 6, wherein the magnetic sensor is a Hall sensor, an anisotropic magnetoresistance sensor, a giant magnetoresistance sensor, or a tunnel magnetoresistance sensor.

8. 7. The magnetic switch with filtering function according to claim 6, wherein the circuit structure of the at least one magnetic sensor is in a single resistor, half bridge, or full bridge configuration.

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