Sensing detection circuit and electronic equipment

Abstract

The utility model relates to a sensing detection circuit and electronic equipment. The sensing detection circuit comprises a detection module which is used for outputting a detection signal when a target object is detected; the signal amplification module is connected with the detection module and is used for amplifying the detection signal to obtain an amplified signal; the plurality of window comparison modules are connected to the signal amplification module; the window comparison module is used for judging whether the received amplified signal falls into a corresponding threshold range or not so as to output a corresponding trigger signal; wherein the combination of the trigger signals is used for representing the motion state of the target object. According to the invention, diversified scene detection requirements can be met.

Description

Technical Field

[0001] The present application relates to the field of smart home, and particularly to a sensing detection circuit and an electronic device. Background Art

[0002] More and more smart home devices have entered thousands of households. Among them, the human body sensor is a very common way to detect whether someone passes by as the trigger end of the smart home. However, the current human body sensor can only detect the presence of a human body and cannot meet the detection requirements of diverse scenarios. Utility Model Content

[0003] Based on this, it is necessary to provide a sensing detection circuit and an electronic device that can meet the detection requirements of diverse scenarios.

[0004] In a first aspect, the present application provides a sensing detection circuit, including:

[0005] A detection module, configured to output a detection signal when a target object is detected;

[0006] A signal amplification module, connected to the detection module, configured to amplify the detection signal to obtain an amplified signal;

[0007] A plurality of window comparison modules, all connected to the signal amplification module; the window comparison module is configured to determine whether the received amplified signal falls within a corresponding threshold range to output a corresponding trigger signal; wherein, the combination of each trigger signal is used to characterize the motion state of the target object.

[0008] In one embodiment, the window comparison module is configured to compare the amplified signal with the upper limit value and / or the lower limit value of the threshold range;

[0009] Wherein, the threshold voltages of each window comparison module increase in sequence; the threshold voltage is the difference between the upper limit value and the lower limit value.

[0010] In one embodiment, in each window comparison module, the absolute value of the difference between the upper limit value and the reference voltage is the same as the absolute value of the difference between the lower limit value and the reference voltage.

[0011] In one embodiment, the signal amplification module includes a first operational amplifier and a second operational amplifier;

[0012] One end of the second operational amplifier is connected to the first operational amplifier, and the other end of the second operational amplifier is respectively connected to each window comparison module;

[0013] The first operational amplifier is configured to amplify the detection signal and output the amplified detection signal to the second operational amplifier;

[0014] A second operational amplifier is used to amplify the output signal of the first operational amplifier and output an amplified signal.

[0015] In one embodiment, the sensing and detecting circuit further includes:

[0016] A voltage dividing module, and multiple output terminals of the voltage dividing module are respectively connected to each window comparison module; the voltage dividing module is used to provide corresponding upper limit values and lower limit values to the window comparison module.

[0017] In one embodiment, the voltage dividing module includes a symmetric voltage dividing unit;

[0018] The symmetric voltage dividing unit includes a first voltage dividing element, a window voltage dividing element, and a second voltage dividing element; one end of the first voltage dividing element is used to connect to a reference power supply, the other end of the first voltage dividing element is connected to one end of the second voltage dividing element through the window voltage dividing element, and the other end of the second voltage dividing element is grounded;

[0019] Two input terminals of the window comparison module are respectively connected to both ends of the window voltage dividing element.

[0020] In one embodiment, the window comparison module includes a third operational amplifier and a fourth operational amplifier;

[0021] The first input terminal of the third operational amplifier and the first input terminal of the fourth operational amplifier are both connected to the output terminal of the signal amplification module, and the second input terminal of the third operational amplifier and the second input terminal of the fourth operational amplifier are respectively connected to both ends of the window voltage dividing element;

[0022] The voltage of the second input terminal of the third operational amplifier is the upper limit value of the window comparison module, and the voltage of the second input terminal of the fourth operational amplifier is the lower limit value of the window comparison module;

[0023] When the amplified signal is greater than the upper limit value, the output terminal of the third operational amplifier is used to output a trigger signal; when the amplified signal is less than the lower limit value, the output terminal of the fourth operational amplifier is used to output a trigger signal.

[0024] In one embodiment, the number of elements of the window voltage dividing elements corresponding to each window comparison module increases sequentially.

[0025] In one embodiment, the output timings of the respective trigger signals are used to represent the movement direction of the target object.

[0026] In a second aspect, the present application provides an electronic device, including a control module and the above-mentioned sensing and detecting circuit; the output terminal of the window comparison module is connected to the control module.

[0027] In one embodiment, the electronic device further includes a UWB module connected to the control module;

[0028] Among them, the control module turns on or off the UWB module based on the trigger signal output by the sensing detection circuit.

[0029] For the above-mentioned sensing detection circuit and electronic device, the sensing detection circuit includes a detection module, a signal amplification module, and multiple window comparison modules. Among them, the detection module outputs a detection signal when detecting a target object, and the signal amplification module amplifies the detection signal to obtain an amplified signal. The window comparison module can then determine whether the received amplified signal falls within the corresponding threshold range and output a corresponding trigger signal, so that the combination of each trigger signal can characterize the motion state of the target object. This application can determine the activity of the target object at different distances to meet the detection requirements of diverse scenarios. Description of the Drawings

[0030] To more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of a sensing detection circuit according to an embodiment;

[0032] Figure 2 It is a schematic structural diagram of a signal amplification module according to an embodiment;

[0033] Figure 3 It is a schematic structural diagram of a sensing detection circuit according to another embodiment;

[0034] Figure 4 It is a schematic structural diagram of a voltage division module according to an embodiment;

[0035] Figure 5 It is a specific schematic structural diagram of a sensing detection circuit according to an embodiment;

[0036] Figure 6 It is a schematic working process diagram of a sensing detection circuit according to an embodiment;

[0037] Figure 7 It is a schematic internal structure diagram of an electronic device according to an embodiment;

[0038] Figure 8 It is a schematic structural diagram of an intelligent door lock according to an embodiment;

[0039] Figure 9 It is a hardware structure block diagram of an intelligent door lock according to an embodiment;

[0040] Figure 10Block diagram of a smart home system based on a smart door lock according to an embodiment. Detailed implementation manners

[0041] To facilitate the understanding of this application, the following will describe this application more comprehensively with reference to the relevant drawings. Embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of this application more thorough and comprehensive.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the description of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0043] It can be understood that the terms "first", "second", etc. used in this application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0044] It can be understood that in the following embodiments, "connection", if there is an electrical signal or data transfer between the connected circuits, modules, units, etc., should be understood as "electrical connection", "communication connection", etc.

[0045] It can be understood that "at least one" means one or more, and "a plurality" means two or more. "At least a part of an element" means a part or all of the element.

[0046] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms "comprise / include" or "have" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the related listed items.

[0047] At present, human body sensors can only detect whether a human body has passed by. With the increasing demands of users, the requirements for sensor detection are also getting higher and higher. However, the existing solution using a pyroelectric infrared sensor PIR (Passive Infrared Radiation) can only sense the passing of a human body. When a human body enters the detection area, the PIR senses the difference signal between the human body temperature and the background temperature. After being amplified by an amplifier, the voltage will exceed the set window voltage, thereby determining that a human body has passed by. The existing solution has at least the following problems: it can only detect whether a human body has passed by or is active in the detection area, and cannot determine whether the human activity area is far or near, whether it is approaching the sensor or moving away from the sensor.

[0048] Based on the sensing and detection circuit of the embodiment of the present application, when using a human body sensor to detect a human body, it can determine whether the human body is moving in a far area or a near area, approaching or moving away from the sensor, and further provide more diverse scenarios for the trigger end of the smart home.

[0049] As Figure 1 shown, the sensing and detection circuit of an embodiment includes:

[0050] A detection module 202, configured to output a detection signal when detecting a target object;

[0051] A signal amplification module 204, connected to the detection module 202, configured to amplify the detection signal to obtain an amplified signal;

[0052] Multiple window comparison modules 206, all connected to the signal amplification module 204; the window comparison module 206 is configured to determine whether the received amplified signal falls within the corresponding threshold range to output a corresponding trigger signal; wherein, the combination of each trigger signal is used to characterize the motion state of the target object.

[0053] Specifically, the detection module 202 can be configured to output a detection signal when detecting a target object, where the target object may include but is not limited to a human body; for example, the target object may be a person with vital signs, or a pet or a robot, etc. It can be understood that the specific type of the target object can be determined according to actual needs.

[0054] In some examples, the detection module 202 can be a human body sensor, which can be used to detect the distance between a person and the detection module. Among them, the human body sensor is widely used in the household and industrial fields. It is a sensor that detects the human body and can detect a moving human body within a certain range. Optionally, the human body sensor can include, but is not limited to, a pyroelectric infrared sensor PIR, a radar (Radio Detection and Ranging) sensor, a time-of-flight ToF (Time of Flight) sensor, which is not limited here. It should be noted that the pyroelectric infrared sensor PIR can be abbreviated as the PIR sensor.

[0055] It can be understood that the above detection module can also adopt other forms, not limited to the forms already mentioned in the above embodiments, as long as it can achieve the function of outputting a detection signal when detecting a target object.

[0056] Further, the detection signal output by the detection module 202 can be a voltage signal or a current signal. The signal amplification module 204 connected to the detection module 202 can amplify the detection signal to obtain an amplified signal. Taking the detection signal as a voltage signal and the target object as a human body as an example, when a person is detected, the detection module 202 outputs a tiny voltage signal (this signal can fluctuate with the movement of the human body), and this tiny voltage signal can be amplified by the signal amplification module 204 to obtain an amplified signal.

[0057] Exemplarily, the signal amplification module 204 can be implemented by using a corresponding amplification circuit, such as an operational amplifier, a multi-stage amplification circuit, etc. Exemplarily, the signal amplification module can be an AMP operational amplifier system. It can be understood that the above signal amplification module can also adopt other forms, not limited to the forms already mentioned in the above embodiments, as long as it can achieve the function of amplifying the detection signal to obtain an amplified signal.

[0058] Multiple window comparison modules 206 are all connected to the signal amplification module 204. Among them, after receiving the amplified signal output by the signal amplification module 204, the window comparison module 206 can determine whether the amplified signal falls within the corresponding threshold range, and then output a corresponding trigger signal. In the embodiments of the present application, the combination of each trigger signal can be used to characterize the motion state of the target object, such as the movement state of a person. Optionally, the threshold range can be a voltage threshold range or a current threshold range; the trigger signal can be a voltage signal or a current signal.

[0059] Exemplarily, the threshold ranges corresponding to each window comparison module 206 can be different, and the amplified signal is output through different window comparison modules to achieve the detection of target objects in different active regions (such as different distances); in the embodiments of the present application, through multiple window comparison modules, the amplified signal is compared with different threshold ranges, and corresponding trigger signals are output, so that the motion state of the target object can be determined through the combination of each trigger signal. For example, it can be determined whether the target object is moving away or approaching according to the activity of the target object at different distances, so as to meet the detection requirements of diverse scenarios.

[0060] Among them, the window comparison module 206 can be implemented by using a corresponding window comparison circuit, such as a window comparator, etc.; exemplarily, a window comparator is an electronic circuit that can be used to compare the relationship between an input signal and two threshold voltages (for example, an upper threshold voltage and a lower threshold voltage), and then it can be determined whether the input signal is within a certain voltage range and generate a corresponding output signal. It can be understood that the above window comparison module can also adopt other forms, not limited to the forms already mentioned in the above embodiments, as long as it can achieve the function of determining whether the received amplified signal falls within the corresponding threshold range to output a corresponding trigger signal.

[0061] It can be understood that taking the sensing detection circuit applied to an electronic device as an example, the trigger signal output by the window comparison module can also be transmitted to the control module of the electronic device. Then, the control module can determine the activity of the target object according to the combination of each trigger signal, so as to start or close other function modules (such as modules with high power consumption, etc.) in the electronic device according to the activity of the target object, thereby controlling the power consumption. Exemplarily, the above sensing detection circuit can be applied to smart home devices such as smart door locks or similar electronic devices, serving as a trigger end of the smart home to provide more diverse scenarios.

[0062] For the above sensing detection circuit, a detection signal is obtained through a detection module, the detection signal is amplified by a signal amplification module to obtain an amplified signal, and then through multiple window comparison modules, it is determined whether the received amplified signal falls within the corresponding threshold range to output a corresponding trigger signal, so that the combination of each trigger signal can represent the motion state of the target object. The present application can determine the activity of the target object at different distances, and while detecting the target object (such as a human body), it can judge whether the target object is active in a distant area or a nearby area, approaching or moving away, so as to meet the detection requirements of diverse scenarios.

[0063] In an exemplary embodiment, the detection module may include a PIR probe, and the PIR probe is used to receive the human body infrared signal and output a detection signal.

[0064] Specifically, the detection module in the embodiments of the present application may be a PIR sensor, and the PIR sensor may include a PIR probe. Taking the target object as a human body as an example, the PIR probe can be used to receive the infrared signal of the human body and output a detection signal to the signal amplification module.

[0065] In some embodiments, the window comparison module is used to compare the amplified signal with the upper limit value and / or the lower limit value of the threshold range;

[0066] Among them, the threshold voltages of the window comparison modules increase in sequence; the threshold voltage is the difference between the upper limit value and the lower limit value.

[0067] Specifically, the threshold range may include an upper limit value and a lower limit value. The window comparison module outputs a trigger signal by comparing the amplified signal with the upper limit value and / or the lower limit value. Among them, the upper limit value may refer to the upper threshold value (for example, the value of the upper threshold voltage), and the lower limit value may refer to the lower threshold value (for example, the value of the lower threshold voltage).

[0068] Taking the window comparison module using a window comparator as an example, the window comparator may have an upper threshold voltage (Upper Threshold Voltage) and a lower threshold voltage (Lower Threshold Voltage). The amplified signal is used as the input signal and will be compared with the upper threshold voltage and the lower threshold voltage. If the voltage of the input signal exceeds the upper threshold voltage, the output signal will be triggered to a high level; if the voltage of the input signal is lower than the lower threshold voltage, the output signal will be triggered to a low level; if the voltage of the input signal is between the upper threshold voltage and the lower threshold voltage, the output signal will remain unchanged.

[0069] Another example is that taking the detection signal as a voltage signal, the target object as a human body, and the detection module as a PIR sensor, when the human body moves in front of the PIR sensor, it switches between the sensitive area and the blind area of the PIR sensor, resulting in the PIR sensor outputting a voltage that fluctuates between high and low. The fluctuating voltage can be amplified by the signal amplification module and then compared with the upper limit value and / or the lower limit value of the window comparison module. If it exceeds the corresponding value, it can be triggered as someone moving. Among them, if moving from the blind area to the sensitive area, the PIR sensor outputs a high voltage (the power supply that fluctuates upward), which is amplified by the signal amplification module and then compared with the upper limit value; if moving from the sensitive area to the blind area, the PIR sensor can output a low voltage (the power supply that fluctuates downward), which is amplified by the signal amplification module and then compared with the lower limit value.

[0070] Exemplarily, the threshold voltages of the respective window comparison modules increase sequentially, and the threshold voltage is the difference between the upper limit value and the lower limit value. It can be understood that the window comparison module with a smaller threshold voltage is used to detect whether a target object at a relatively far distance is triggered, and the window comparison module with a larger threshold voltage is used to detect whether a target object at a relatively close distance is triggered. Through the window comparison modules with sequentially increasing threshold voltages, it is possible to detect the activities of the target object at different distances, and by combining the respective trigger signals, the continuous action situation of the target object, such as the moving direction, can be obtained.

[0071] Taking the case where the window comparison module adopts a window comparison circuit as an example, the number of multiple window comparison circuits is 3, which are a first window comparison circuit, a second window comparison circuit, and a third window comparison circuit respectively. Among them, the threshold voltage of the first window comparison circuit > the threshold voltage of the second window comparison circuit > the threshold voltage of the third window comparison circuit. Furthermore, the first window comparison circuit can be used to detect a target object at a short distance, the second window comparison circuit can be used to detect a target object at a medium distance, and the third window comparison circuit can be used to detect a target object at a long distance, and output corresponding trigger signals when the target object is triggered. Furthermore, by combining the multiple trigger signals, the moving direction of the target object can be determined.

[0072] In a possible implementation, in each window comparison module, the absolute value of the difference between the upper limit value and the reference voltage is the same as the absolute value of the difference between the lower limit value and the reference voltage.

[0073] Specifically, in the embodiments of the present application, the threshold centers of the respective window comparison modules are the same, that is, the absolute value of the difference between the upper limit value and the reference voltage is the same as the absolute value of the difference between the lower limit value and the reference voltage. Furthermore, after the amplified signal enters each window comparison module at the same time, the timing of each window comparison module outputting a trigger signal is different, so that the combination of the respective trigger signals can accurately represent the activity area and activity state of the target object.

[0074] Taking the case where the window comparison module adopts a window comparison circuit as an example, the number of multiple window comparison circuits is 3, which are a first window comparison circuit, a second window comparison circuit, and a third window comparison circuit respectively. Among them, the threshold voltage of the first window comparison circuit > the threshold voltage of the second window comparison circuit > the threshold voltage of the third window comparison circuit. Furthermore, if there is a level change in the window comparison circuit, it is the third window comparison circuit that changes level first, then the second window comparison circuit changes level, and finally the first window comparison circuit changes level. That is, in actual operation, the third window comparison circuit is triggered first, then the second window comparison circuit is triggered, and finally the first window comparison circuit is triggered. Before the first window comparison circuit outputs a trigger signal, the second window comparison circuit and the third window comparison circuit have already output trigger signals.

[0075] In one embodiment, as Figure 2 shown, the signal amplification module includes a first operational amplifier and a second operational amplifier;

[0076] One end of the second operational amplifier is connected to the first operational amplifier, and the other end of the second operational amplifier is respectively connected to each window comparison module;

[0077] The first operational amplifier is used to amplify the detection signal and output the amplified detection signal to the second operational amplifier;

[0078] The second operational amplifier is used to amplify the output signal of the first operational amplifier and output the amplified signal.

[0079] Specifically, one end of the second operational amplifier is connected to the first operational amplifier, and the other end of the second operational amplifier is respectively connected to each window comparison module. Then, based on the first operational amplifier and the second operational amplifier, the detection signal output by the detection module can be amplified by two - stage operational amplifiers and output to the window comparison module. Among them, the first operational amplifier outputs the amplified detection signal as the output signal to the second operational amplifier, and the second operational amplifier amplifies the output signal of the first operational amplifier and outputs the amplified signal.

[0080] Exemplarily, the first input terminal of the first operational amplifier (U2D) can be connected to the output terminal of the detection module. The second input terminal of the first operational amplifier (U2D) is grounded through a resistor (R1) and a capacitor (C1) in sequence. The second input terminal of the first operational amplifier (U2D) is also respectively connected to the output terminal of the first operational amplifier (U2D) through a resistor (R2) and a capacitor (C2); the output terminal of the first operational amplifier (U2D) is connected to the first input terminal of the second operational amplifier (U2C). The first input terminal of the second operational amplifier (U2C) is connected to the output terminal of the second operational amplifier (U2C) through a resistor (R3) and a resistor (R4) in sequence. The first input terminal of the second operational amplifier (U2C) is also connected to the output terminal of the second operational amplifier (U2C) through a capacitor (C3). The second input terminal of the second operational amplifier (U2C) is grounded through a capacitor (C4) and a capacitor (C5) respectively. The output terminal of the second operational amplifier (U2C) is respectively connected to each window comparison module.

[0081] Further, the output terminal of the first operational amplifier (U2D) is connected to one end of a capacitor (C7), and the other end of the capacitor (C7) is connected to the first input terminal of the second operational amplifier (U2C) through a thermistor (NTC).

[0082] It can be understood that both the first operational amplifier and the second operational amplifier can be operational amplifier chips. Among them, the operational amplifier chips can use differential amplification circuits for signal amplification.

[0083] Regarding the upper limit value and the lower limit value of the window comparison module, they can be provided by corresponding components. For example, Figure 3 As shown, the sensing detection circuit of an embodiment may further include:

[0084] A voltage dividing module, and multiple output terminals of the voltage dividing module are respectively connected to each window comparison module; the voltage dividing module is used to provide corresponding upper limit values and lower limit values to the window comparison module.

[0085] Specifically, the voltage dividing module can provide corresponding upper limit values and lower limit values to the window comparison module, wherein multiple output terminals of the voltage dividing module are respectively connected to each window comparison module; exemplarily, the voltage dividing module can be implemented by a voltage dividing circuit. It can be understood that the above voltage dividing module can also adopt other forms, rather than being limited to the forms already mentioned in the above embodiments, as long as it can achieve the function of providing corresponding upper limit values and lower limit values to the window comparison module.

[0086] In one of the embodiments, as Figure 4 shown, the voltage dividing module includes a symmetric voltage dividing unit;

[0087] The symmetric voltage dividing unit includes a first voltage dividing element, a window voltage dividing element, and a second voltage dividing element; one end of the first voltage dividing element is used to connect to a reference power supply, the other end of the first voltage dividing element is connected to one end of the second voltage dividing element through the window voltage dividing element, and the other end of the second voltage dividing element is grounded; the voltage dividing elements in the window voltage dividing element are symmetrically distributed according to the magnitude of the voltage dividing ability;

[0088] Two input terminals of the window comparison module are respectively connected to both ends of the window voltage dividing element.

[0089] Specifically, the voltage dividing module may include a symmetric voltage dividing unit, and the symmetric voltage dividing unit includes a first voltage dividing element, a window voltage dividing element, and a second voltage dividing element. Exemplarily, the first voltage dividing element, the window voltage dividing element, and the second voltage dividing element can be implemented by resistors, that is, the voltage dividing module can be a series resistor voltage dividing circuit. Optionally, there is no limit to the number of voltage dividing elements in the first voltage dividing element, the window voltage dividing element, and the second voltage dividing element.

[0090] Among them, through the symmetric voltage dividing unit, the threshold centers of each window comparison module are the same, that is, the absolute value of the difference between the upper limit value and the reference voltage is the same as the absolute value of the difference between the lower limit value and the reference voltage. Optionally, the symmetric voltage dividing unit can provide thresholds for each window comparison module: the threshold of the window comparison module can refer to the absolute value of the difference between the upper limit value and the reference voltage or the absolute value of the difference between the lower limit value and the reference voltage.

[0091] Taking the reference power supply as voltage V, and assuming that the first voltage dividing element, the window voltage dividing element, and the second voltage dividing element all adopt resistors as an example, the threshold of the window comparison module = |V * R0 / R 总 |, where R 0 is the total resistance of the window voltage-dividing element, and R 总 is the total resistance of the first voltage-dividing element, the window voltage-dividing element, and the second voltage-dividing element. Exemplarily, the thresholds of each window comparison module can be the same or different; optionally, the thresholds of each window comparison module can increase sequentially.

[0092] In one embodiment, the number of elements of the window voltage-dividing elements corresponding to each window comparison module increases sequentially.

[0093] Specifically, in the embodiments of the present application, the number of elements of the window voltage-dividing elements corresponding to each window comparison module can increase sequentially, so that the thresholds of each window comparison module increase sequentially.

[0094] Taking the window comparison module using a window comparison circuit as an example, the number of multiple window comparison circuits is 3, which are the first window comparison circuit (window comparison circuit 1), the second window comparison circuit (window comparison circuit 2), and the third window comparison circuit (window comparison circuit 3), and the symmetric voltage-dividing unit includes resistors R5, R6, R7, R8, R9, R10, R11, and R12 connected in sequence: Resistor R5 is used as the first voltage-dividing element, one end of resistor R5 is connected to the reference power supply, the other end of resistor R5 is connected to resistor R6, resistor R12 is used as the second voltage-dividing element, one end of resistor R12 is connected to resistor R11, the other end of resistor R12 is grounded, resistors R6, R7, R8, R9, R10, and R11 are used as window voltage-dividing elements, and resistor R6 is symmetric with resistor R11, resistor R7 is symmetric with resistor R10, and resistor R8 is symmetric with resistor R9. One end of the capacitor (C7) is connected between resistor R11 and resistor R12, and the other end of the capacitor (C7) is grounded; the second input terminal of the second operational amplifier (U2C) is connected between resistor R8 and resistor R9.

[0095] Among them, one input terminal of the window comparison circuit 1 is connected between resistor R5 and resistor R6, the other input terminal of the window comparison circuit 1 is connected between resistor R11 and resistor R12, one input terminal of the window comparison circuit 2 is connected between resistor R6 and resistor R7, the other input terminal of the window comparison circuit 2 is connected between resistor R10 and resistor R11, one input terminal of the window comparison circuit 3 is connected between resistor R7 and resistor R8, and the other input terminal of the window comparison circuit 3 is connected between resistor R9 and resistor R10.

[0096] That is, the number of component elements of the window voltage dividing elements corresponding to window comparison circuit 1 is 3 (resistor R6, resistor R7, and resistor R8 respectively), the number of component elements of the window voltage dividing elements corresponding to window comparison circuit 2 is 2 (resistor R7 and resistor R8 respectively), and the number of component elements of the window voltage dividing elements corresponding to window comparison circuit 3 is 1 (resistor R8). Taking the reference power supply voltage V as an example:

[0097] Threshold of window comparison circuit 3 = |V * R8 / (R5 + R6 + R7 + R8 + R9 + R10 + R11 + R12)|

[0098] Threshold of window comparison circuit 2 = |V * (R7 + R8) / (R5 + R6 + R7 + R8 + R9 + R10 + R11 + R12)|

[0099] Threshold of window comparison circuit 1 = |V * (R6 + R7 + R8) / (R5 + R6 + R7 + R8 + R9 + R10 + R11 + R12)|

[0100] That is, the threshold for detecting long distances (window comparison circuit 3) ≤ the threshold for detecting medium distances (window comparison circuit 2) ≤ the threshold for detecting short distances (window comparison circuit 1).

[0101] In one embodiment, the window comparison module includes a third operational amplifier and a fourth operational amplifier;

[0102] The first input terminal of the third operational amplifier and the first input terminal of the fourth operational amplifier are both connected to the output terminal of the signal amplification module, and the second input terminal of the third operational amplifier and the second input terminal of the fourth operational amplifier are respectively connected to both ends of the window voltage dividing element;

[0103] The voltage at the second input terminal of the third operational amplifier is the upper limit value of the window comparison module, and the voltage at the second input terminal of the fourth operational amplifier is the lower limit value of the window comparison module;

[0104] When the amplified signal is greater than the upper limit value, the output terminal of the third operational amplifier is used to output a trigger signal; when the amplified signal is less than the lower limit value, the output terminal of the fourth operational amplifier is used to output a trigger signal.

[0105] Specifically, the window comparison module in the embodiment of the present application can be implemented using operational amplifiers. Among them, the first input terminal of the third operational amplifier and the first input terminal of the fourth operational amplifier are both connected to the output terminal of the signal amplification module, the second input terminal of the third operational amplifier and the second input terminal of the fourth operational amplifier are respectively connected to both ends of the window voltage dividing element, and the voltage at the second input terminal of the third operational amplifier is the upper limit value of the window comparison module, and the voltage at the second input terminal of the fourth operational amplifier is the lower limit value of the window comparison module.

[0106] Exemplarily, when the amplified signal is greater than the upper limit value, the output terminal of the third operational amplifier can be used to output a trigger signal, and when the amplified signal is less than the lower limit value, the output terminal of the fourth operational amplifier is used to output a trigger signal. Optionally, the window comparison module may further include a first resistor (such as resistor R13 hereinafter) connected to the output terminal of the third operational amplifier, and a second resistor (such as resistor R14 hereinafter) connected to the output terminal of the fourth operational amplifier.

[0107] It can be understood that both the third operational amplifier and the fourth operational amplifier can be operational amplifier chips, wherein the operational amplifier chips can use a differential amplification circuit to amplify signals.

[0108] Taking the window comparison module using a window comparison circuit as an example, the number of multiple window comparison circuits is 3, namely the first window comparison circuit (window comparison circuit 1), the second window comparison circuit (window comparison circuit 2), and the third window comparison circuit (window comparison circuit 3), and the symmetric voltage division unit includes resistors R5, R6, R7, R8, R9, R10, R11, and R12 connected in sequence.

[0109] The first input terminals of the third operational amplifier (U2A) and the fourth operational amplifier (U2B) of window comparison circuit 1 are both connected to the output terminal of the second operational amplifier (U2C). The second input terminal of the third operational amplifier (U2A) is connected between resistor R5 and resistor R6, and the second input terminal of the fourth operational amplifier (U2B) is connected between resistor R11 and resistor R12. One end of resistor R13 is connected to the output terminal of the third operational amplifier (U2A), and the other end of resistor R13 is used to output a trigger signal. One end of resistor R14 is connected to the output terminal of the fourth operational amplifier (U2B), and the other end of resistor R14 is used to output a trigger signal.

[0110] The first input terminals of the third operational amplifier (U1A) and the fourth operational amplifier (U1B) of window comparison circuit 2 are both connected to the output terminal of the second operational amplifier (U2C). The second input terminal of the third operational amplifier (U1A) is connected between resistor R6 and resistor R7, and the second input terminal of the fourth operational amplifier (U1B) is connected between resistor R10 and resistor R11. One end of resistor R15 is connected to the output terminal of the third operational amplifier (U1A), and the other end of resistor R15 is used to output a trigger signal. One end of resistor R16 is connected to the output terminal of the fourth operational amplifier (U1B), and the other end of resistor R16 is used to output a trigger signal.

[0111] The first input terminal of the third operational amplifier (U1D) and the first input terminal of the fourth operational amplifier (U1C) of the window comparison circuit 3 are both connected to the output terminal of the second operational amplifier (U2C). The second input terminal of the third operational amplifier (U1D) is connected between the resistor R7 and the resistor R8. The second input terminal of the fourth operational amplifier (U1C) is connected between the resistor R9 and the resistor R10. One end of the resistor R17 is connected to the output terminal of the third operational amplifier (U1D), and the other end of the resistor R17 is used to output a trigger signal. One end of the resistor R18 is connected to the output terminal of the fourth operational amplifier (U1C), and the other end of the resistor R18 is used to output a trigger signal.

[0112] Further, the amplified signal is output through different window comparison circuits to detect the signals of whether the long distance (window comparison circuit 3), the medium distance (window comparison circuit 2), and the short distance (window comparison circuit 1) are triggered. Among them, the high level is the non-triggered signal, and the low level is the triggered signal. The working modes of the three window comparison circuits can be:

[0113] Taking the detected signal as a voltage signal as an example, when someone triggers, the detection module can output a tiny voltage signal (this signal fluctuates with the movement of the human body). This voltage signal is amplified by two-stage operational amplifiers (operational amplifier U2D and operational amplifier U2C) and then output to each window comparison circuit. Each window comparison circuit can compare the output signal with the input signal of the voltage division module. If the output signal of the operational amplifier U2C is greater than the upper limit value of the input signal of the voltage division module, a low level is output. If the signal output by the operational amplifier U2C is less than the lower limit value of the input signal of the voltage division module, a low level is output. Otherwise, a high level is output when no one triggers.

[0114] The window comparison circuit 1 includes the operational amplifier U2A, the operational amplifier U2B, and the resistors R13 and R14, and can be used to detect whether someone triggers at a short distance. The other end TP1 of the resistor R13 and the other end TP2 of the resistor R14 can be the output terminals of the window comparison circuit 1. When someone triggers at a short distance, if the operational amplifier U2A determines that the output signal of the operational amplifier U2C is greater than the upper limit value, TP1 outputs a low level. Or, if the operational amplifier U2B determines that the output signal of the operational amplifier U2C is less than the lower limit value, TP2 outputs a low level. Otherwise, TP1 and TP2 output a high level when no one triggers at a short distance.

[0115] The window comparison circuit 2 includes operational amplifiers U1A, U1B, resistor R15, and resistor R16, and can be used to detect whether someone triggers in the medium distance; the other end TP3 of resistor R15 and the other end TP4 of resistor R16 can be used as the output terminals of the window comparison circuit 2. When someone triggers in the medium distance, TP3 or TP4 outputs a low level, and when no one triggers in the medium distance, TP3 and TP4 output a high level.

[0116] The window comparison circuit 3 includes operational amplifiers U1C, U1D, resistor R17, and resistor R18, and can be used to identify whether someone triggers in the long distance; the other end TP5 of resistor R17 and the other end TP6 of resistor R18 can be used as the output terminals of the window comparison circuit 3; when someone triggers in the long distance, TP5 or TP6 outputs a low level, and when no one triggers in the long distance, TP5 and TP6 output a high level.

[0117] It can be understood that the window comparison circuit 1, the window comparison circuit 2, and the window comparison circuit 3 are connected to the same series resistor voltage division circuit, and the threshold centers are the same. The threshold voltage of the window comparison circuit 1 is greater than the threshold voltage of the window comparison circuit 2, and the threshold voltage of the window comparison circuit 2 is greater than the threshold voltage of the window comparison circuit 3.

[0118] In practical applications, based on the above sensing detection circuit, in one embodiment, the output timing of each trigger signal can be used to represent the movement direction of the target object.

[0119] Specifically, taking the target object as a human body as an example, through the output timing of each trigger signal, it can be determined whether the human activity area is far away or close, and whether it is approaching or moving away.

[0120] The following takes the specific circuits of the window comparison circuit 1, the window comparison circuit 2, and the window comparison circuit 3 as examples to specifically illustrate the working process of the sensing detection circuit applied to the electronic device, as Figure 5 shown, the electronic device may include a control module (also referred to as the main control) connected to the sensing detection circuit. Among them, the detection module may include a PIR probe, the signal amplification module may adopt an AMP operational amplifier system, the voltage division module may adopt a voltage division circuit, the sensing detection circuit includes two four-operational amplifier chips and electronic capacitors and other devices. The detection signal output by the PIR probe is amplified by two groups of operational amplifiers (operational amplifier D and operational amplifier C) in the four-operational amplifier U2 to obtain an amplified PIR detection signal (i.e., an amplified signal). Furthermore, the amplified PIR detection signal can be output through different window comparison circuits, such as the window comparison circuit 3 for detecting long distances, the window comparison circuit 2 for detecting medium distances, and the window comparison circuit 1 for detecting short distances;

[0121] Under normal circumstances, except that the sensing detection circuit works normally and the control module is in the sleep state, other modules can be in the power-off state, as Figure 6 shown:

[0122] Step 1: When there is no one, the main control is in the sleep state all the time, and the sensing detection circuit (PIR) is in the monitoring state all the time.

[0123] Step 2: When the output level of the window comparison circuit 3 changes, it triggers the main control. The main control identifies it as "someone moving at a long distance" and starts "counting down for 10 seconds" and then enters the sleep state again;

[0124] If the output levels of all window comparison circuits do not change within 10 seconds, the main control identifies it as "someone moving away" and clears "someone moving at a long distance" and "counting down for 10 seconds" and then enters the sleep state again, returning to Step 1;

[0125] If the output level of the window comparison circuit 3 changes (low level) within 10 seconds, it triggers the main control. The main control identifies it as "someone moving at a long distance" and starts "counting down for 10 seconds" and then enters the sleep state again, returning to Step 2; Among them, regarding entering the sleep state again after "counting down for 10 seconds" in this step, it can be understood that it is used to identify whether someone just passed by or passed through the detection area of the PIR. If so, it will enter the initial state again after 10s (it can also return to Step 2 without this step, but it cannot judge whether the person is moving away or approaching). The "counting down for 10 seconds" in this step and the 10s in "the output level of the window comparison circuit 2 changes within 10 seconds" in Step 3 are the same time period.

[0126] Step 3: If the output level of the window comparison circuit 2 changes (low level) within 10 seconds, it triggers the main control. Then the main control identifies it as "someone moving at a medium distance" and someone is approaching, and then starts "counting down for 10 seconds" and then enters the sleep state again; Among them, regarding then starting "counting down for 10 seconds" and then entering the sleep state again in this step, it can be understood that this 10-second countdown can be used as a window to distinguish states: if the window comparator 2 triggers the main control within 10 seconds, it means someone is moving at a medium distance (maybe staying in this distance range), and if the window comparator 1 triggers the main control, it means someone is approaching (moving from a medium distance to a short distance).

[0127] If the output level of the window comparison circuit 2 changes and triggers the main control within 10 seconds, the main control identifies it as "someone moving at a medium distance", then starts "counting down for 10 seconds" and then enters the sleep state again, returning to Step 3;

[0128] If only the output level of the window comparison circuit 3 changes and triggers the main control within 10 seconds, the main control identifies it as "someone moving at a long distance" and someone is moving away, then starts "counting down for 10 seconds" and then enters the sleep state again, returning to Step 2;

[0129] If no one triggers within 10 seconds, the main controller identifies it as "someone has moved away" and clears "someone has moved at a long distance" and "countdown for 10 seconds", then returns to the first step;

[0130] Step 4: If the main controller is triggered when the output level of Window Comparison Circuit 1 changes within 10 seconds, the main controller identifies it as "someone has moved at a short distance" and someone is approaching, then restarts "countdown for 10 seconds" and enters the sleep state again;

[0131] If the main controller is triggered when the level at the output terminal of Window Comparison Circuit 1 changes within 10 seconds, the main controller identifies it as "someone has moved at a short distance", then restarts "countdown for 10 seconds" and enters the sleep state again, returning to Step 4;

[0132] If the main controller is triggered when the output level of Window Comparison Circuit 2 changes within 10 seconds, the main controller identifies it as "someone has moved at a medium distance" and someone is moving away, then restarts "countdown for 10 seconds" and enters the sleep state again, returning to Step 3;

[0133] If no one triggers within 10 seconds and the output levels of all window comparison circuits do not change, the main controller identifies it as "someone has moved away" and clears "someone has moved at a long distance" and "countdown for 10 seconds", then enters the sleep state again and returns to the first step.

[0134] As above, the present application realizes the identification of whether the human activity area is far away or close, and whether someone is approaching or moving away from the sensor by using a single PIR probe and two four-operational amplifiers or comparators, and can meet the detection requirements of diverse scenarios.

[0135] In an exemplary embodiment, an electronic device is provided. The electronic device can be a terminal, and its internal structure diagram can be as Figure 7As shown in the figure. The electronic device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface, the display unit, and the input device are connected to the system bus through the input / output interface. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The input / output interface of the electronic device is used to exchange information between the processor and external devices. The communication interface of the electronic device is used to communicate with external terminals in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, near field communication (NFC), or other technologies. When the computer program is executed by the processor, it implements a door lock control method. The display unit of the electronic device is used to form a visually visible picture, which can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen. The input device of the electronic device can be a touch layer covering the display screen, or a button, a trackball, or a touchpad provided on the housing of the electronic device, or an external keyboard, touchpad, or mouse, etc.

[0136] Those skilled in the art can understand that Figure 7 the structure shown in the figure is only a block diagram of some structures related to the solution of the present application, and does not constitute a limitation on the electronic device to which the solution of the present application is applied. The specific electronic device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0137] In one embodiment, an electronic device is provided, including a control module and the above-mentioned sensing and detection circuit; the output end of the window comparison module is connected to the control module.

[0138] In one of the embodiments, the electronic device may further include a UWB (Ultra-WideBand) module connected to the control module; wherein, the control module turns on or off the UWB module based on the trigger signal output by the sensing and detection circuit.

[0139] Based on the sensing and detection circuit in this application, it can be used in an electronic device to enable / disable UWB monitoring for the main control to judge. Further, the sensitivity of the sensing and detection circuit can also be set. Taking the PIR detection circuit with a PIR probe as an example of the sensing and detection circuit, the sensitivity of the PIR detection circuit can include detecting someone moving at a long distance, detecting someone moving at a medium distance, detecting someone moving at a short distance, detecting someone approaching, and detecting someone leaving; the PIR detection circuit can enable or disable UWB detection when detecting someone moving at different sensitivities, thereby reducing the duration of UWB activation and thus reducing the power consumption ratio of UWB during the overall use of the door lock.

[0140] Further, the electronic device can be a smart door lock. For example, Figure 8 as shown, the smart door lock can include a front lock (outdoor lock) for installation outdoors and a rear lock (indoor lock) for installation indoors; the smart door lock can also include a control module, an identification module, and a human body sensor provided on the front lock; the human body sensor, the identification module are connected to the control module. So that the control module can communicate with the human body sensor and the identification module respectively to perform data transmission.

[0141] Among them, the control module can be a microcontroller unit (MCU), or can also be a central processing unit (CPU) unit. In some embodiments, the control module can also be a DSP (Digital Signal Processor), an FPGA (Field-Programmable Gate Array), etc., which are not limited herein. Exemplarily, the control module can refer to the door lock main control (i.e., the main control system, referred to as the main control for short).

[0142] Exemplarily, the identification module can include a UWB module, which is not limited herein. It should be noted that the above identification module can also adopt other forms, rather than being limited to the forms already mentioned in the above embodiments, as long as it can achieve the functions of completing outdoor object identification and obtaining identification information.

[0143] In one of the embodiments, the smart door lock can further include a communication unit, the communication unit is electrically connected to the control module, and the communication unit communicates with an external gateway through a wireless communication method.

[0144] For example, Figure 9As shown in the figure, taking the sensing detection circuit as a PIR detection circuit, the identification module as a UWB module, and the control module as a main controller (such as a main control MCU) as an example, the entire door lock system can be powered by dry batteries or lithium batteries, or can be powered through a USB (Universal Serial Bus) interface; the main controller is connected to the PIR detection circuit, the UWB module and other hardware modules (including but not limited to a millimeter-wave radar detection circuit, a Wifi+BLE (Bluetooth Low Energe) radio frequency chip, an unlocking module, etc.), where the communication unit can be implemented by an antenna; under normal circumstances, except that the PIR detection circuit is working properly and the main controller is in a sleep state, other modules can be in a power-off state.

[0145] The embodiment of the present application also provides a smart home system based on a smart door lock, including the above-mentioned smart door lock and a network device communicating with the smart door lock; wherein, the control module of the smart door lock is connected to the network device through the communication unit.

[0146] Specifically, as Figure 10 shown, the smart home system 10 includes the above-mentioned smart door lock 104 and a network device communicating with the smart door lock 104, where the network device may include a gateway 106 communicating with the smart door lock 104, a server 110 communicating with the gateway 106, and a terminal device 102; optionally, the control module of the smart door lock 104 can be connected to the gateway 106 through the communication unit. Exemplarily, the smart home system 10 may further include a router 108;

[0147] Exemplarily, the gateway 106 is built based on the ZigBee (ZigBee technology) protocol. The smart door lock 104 can be pre-added to the gateway 106. For example, the smart door lock 104 can be a device in the kit to which the gateway belongs when the gateway is shipped from the factory; or the smart door lock 104 can be connected to the gateway 106 through subsequent user operations. Among them, the number of gateways 106 can be at least one.

[0148] In one implementation, the smart door lock 104 can be connected to the gateway 106. In this case, one or more smart door locks 104 can establish a network connection with the gateway 106 based on the ZigBee protocol and thus join the ZigBee network. Both the gateway 106 and the terminal device 102 can be connected to the router 108 and access the Ethernet through the router 108. The router 108 accesses the server 110 through 2G / 3G / 4G / 5G, WIFI (Wireless-Fidelity), etc. For example, the gateway 106 and the terminal device 102 can store the acquired information in the server 110. Optionally, the terminal device 102 can also establish a network connection with the server 110 through 2G / 3G / 4G / 5G, WIFI, etc., so as to obtain the data sent by the server 110.

[0149] Optionally, as Figure 10 shown, the local area network path indicates that the terminal device 102, the router 108, and the gateway 106 are in the same local area network, and the wide area network path indicates that the terminal device 102, the router 108, and the gateway 106 are not in the same local area network. Among them, when the terminal device 102, the router 108, and the gateway 106 are in the same local area network, the terminal device 102 can interact with the gateway 106 and the smart door lock 104 connected to the gateway 106 through the local area network path as Figure 10 shown; it can also interact with the gateway 106 and the smart door lock 104 connected to the gateway 106 through the wide area network path as Figure 10 shown. When the terminal device 102, the router 108, and the gateway 106 are not in the same local area network, the terminal device 102 can interact with the gateway 106 and the smart door lock 104 connected to the gateway 106 through the wide area network path as Figure 10 shown.

[0150] In another implementation, the smart door lock 104 can also not be connected to the gateway 106 and directly establish a connection with the terminal device 102 through a wireless communication method (such as ZigBee or Bluetooth, etc.) for data transmission. It should be noted that in the embodiments of the present application, the smart door lock can adopt UWB technology. After the UWB device (such as a terminal device, such as a mobile phone with UWB function) carried by the user is registered on the smart door lock, when the UWB module on the smart door lock senses the registered UWB device carried by the user during use, it can control the unlocking module to unlock automatically.

[0151] In the description of this specification, the descriptions referring to terms such as "some embodiments", "other embodiments", etc. 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 application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiments or examples. The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0152] The above-described embodiments merely represent several implementation manners of the present application. The descriptions are relatively specific and detailed, but should not be construed as a limitation on the scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A sensing detection circuit, characterized in that: include: A detection module, configured to output a detection signal when a target object is detected; A signal amplification module, connected to the detection module, and used to amplify the detection signal to obtain an amplified signal; Multiple window comparison modules are all connected to the signal amplification module; the window comparison module is used to determine whether the received amplified signal falls within the corresponding threshold range to output a corresponding trigger signal; wherein the combination of each of the trigger signals is used to characterize the motion state of the target object.

2. The sensing detection circuit according to claim 1, characterized in that: The window comparison module is used to compare the amplified signal with the upper limit value and / or the lower limit value of the threshold range; Among them, the threshold voltage of each window comparison module increases in sequence; the threshold voltage is the difference between the upper limit value and the lower limit value.

3. The sensing detection circuit according to claim 2, characterized in that: In each of the window comparison modules, an absolute value of a difference between the upper limit value and a reference voltage is the same as an absolute value of a difference between the lower limit value and the reference voltage.

4. The sensing detection circuit according to claim 2 or 3, characterized in that: The signal amplification module includes a first operational amplifier and a second operational amplifier; One end of the second operational amplifier is connected to the first operational amplifier, and the other end of the second operational amplifier is connected to each of the window comparison modules respectively; The first operational amplifier is used to amplify the detection signal and output the amplified detection signal to the second operational amplifier; The second operational amplifier is used to amplify the output signal of the first operational amplifier and output the amplified signal.

5. The sensing detection circuit according to claim 2 or 3, characterized in that: The sensing detection circuit also includes: A voltage divider module, wherein a plurality of output terminals of the voltage divider module are respectively connected to the window comparison modules; the voltage divider module is used to provide the corresponding upper limit value and lower limit value to the window comparison module.

6. The sensing detection circuit according to claim 5, characterized in that: The voltage division module includes a symmetrical voltage division unit; The symmetrical voltage dividing unit comprises a first voltage dividing element, a window voltage dividing element and a second voltage dividing element; one end of the first voltage dividing element is used to connect to a reference power supply, the other end of the first voltage dividing element is connected to one end of the second voltage dividing element through the window voltage dividing element, and the other end of the second voltage dividing element is grounded; The two input terminals of the window comparison module are respectively connected to the two ends of the window voltage divider element.

7. The sensing detection circuit according to claim 6, characterized in that: The window comparison module includes a third operational amplifier and a fourth operational amplifier; The first input end of the third operational amplifier and the first input end of the fourth operational amplifier are both connected to the output end of the signal amplification module, and the second input end of the third operational amplifier and the second input end of the fourth operational amplifier are respectively connected to the two ends of the window voltage divider element; The voltage at the second input terminal of the third operational amplifier is the upper limit value of the window comparison module, and the voltage at the second input terminal of the fourth operational amplifier is the lower limit value of the window comparison module; When the amplified signal is greater than the upper limit value, the output end of the third operational amplifier is used to output the trigger signal; When the amplified signal is less than the lower limit value, the output end of the fourth operational amplifier is used to output the trigger signal.

8. The sensing detection circuit according to claim 6, characterized in that: The number of components of the window voltage divider components corresponding to each of the window comparison modules increases sequentially.

9. The sensing detection circuit according to claim 6, characterized in that: The output timing of each of the trigger signals is used to indicate the moving direction of the target object.

10. An electronic device, characterized in that: It comprises a control module and the sensing detection circuit according to any one of claims 1 to 8; the output end of the window comparison module is connected to the control module.

11. The electronic device according to claim 10, characterized in that: The electronic device further comprises a UWB module connected to the control module; Wherein, the control module turns on or off the UWB module based on a trigger signal output by the sensor detection circuit.

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