Intelligent vibration switch circuit

Abstract

The utility model discloses an intelligent vibration switch circuit, which belongs to the technical field of switch circuits and is characterized in that electronic components adopt a filtering mode and a low-pass and high-pass mode to meet the gain in a wide frequency band range; according to the utility model, the digital potentiometer is adopted to control the gain, so that automatic switching of control channels is realized; a second digital potentiometer is adopted to automatically adjust the change of the phase to obtain the optimal phase; according to the utility model, by reducing the variety of the electronic module, the applicability of the electronic module is improved, and the intelligence of the electronic module is improved; the application applicability of the whole machine is improved; through self-diagnosis, the reliability of the instrument can be conveniently judged, the service life is prolonged, and the production efficiency of products and the rapidness and convenience of automatic maintenance in application are improved.

Description

Technical Field

[0001] This utility model relates to the field of switching circuit technology, specifically to an intelligent vibration switching circuit. Background Technology

[0002] Vibratory level switches are commonly used instruments in industrial control processes, and their reliability is crucial to the safety of industrial control. These switches are frequently used for high / low level alarms, feeding control, and preventing tank overflows, among other applications.

[0003] In industrial processes such as mineral processing, material conveying systems, and fine chemicals, it is necessary to measure the high and low levels of liquids and solids, providing alarms or control signals. Currently, commonly used level switches, such as tuning forks and vibrating rods, utilize the vibration of a piezoelectric ceramic-driven vibrating body. By leveraging the resonant characteristics of the vibrating body, the maximum amplitude can be obtained when the resonant frequency is reached. The vibration frequency of solid level switches is approximately 140-400Hz, while vibration switches using interface measurement employ 400Hz. These switches can vibrate in liquids and can distinguish whether they are in contact with solid materials.

[0004] However, current electronic modules generally require individual debugging for different vibration frequencies, or different modules are used, which increases the complexity of each switch calibration, requires more manpower, and the operating frequency band of solid vibration switches cannot meet the gain requirements of a wide frequency range, and the gain amplitude cannot be automatically controlled.

[0005] Based on this, this utility model designs an intelligent vibration switch circuit to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the existing technology, this utility model provides an intelligent vibration switch circuit.

[0007] To achieve the above objectives, this utility model employs the following technical solution:

[0008] A smart vibration switch circuit includes a sensor module and a reference circuit module for generating a mid-level signal. The sensor module includes a signal input terminal and a signal output terminal. The signal output terminal of the sensor module is connected to the first signal input terminal of a signal secondary gain amplifier module. The signal output terminal of the MCU is connected to the second signal input terminal of the signal secondary gain amplifier module through a primary signal gain module.

[0009] The two signal outputs of the signal secondary gain amplification module are connected to the signal inputs of the first and second filtered channels, respectively. The signal outputs of the first and second filtered channels are connected to the two signal inputs of the channel selection module, respectively. The signal output of the channel selection module is connected to the signal input of the MCU. The signal output of the MCU is connected to the signal input of the phase adjustment module. The signal output of the phase adjustment module is connected to the signal input of the peak sampling module. The signal output of the peak sampling module is connected to the signal input of the sensor module. The power supply module is connected to both the peak sampling module and the MCU, and provides them with power.

[0010] Furthermore, the primary gain module for the signal includes resistors R1 and R2, a digital potentiometer R3, R4, R5, R6, and R7, capacitors C1, C2, and C3, and an operational amplifier U1A.

[0011] The positive terminal of the power supply is connected to one end of resistor R4. The other end of resistor R4 is connected to one end of digital potentiometer R3 and one end of resistor R1. The other end of digital potentiometer R3 is connected to the slider of digital potentiometer R3. The other end of resistor R1 is connected to one end of capacitor C2, one end of resistor R7, and the non-inverting input terminal of operational amplifier U1A. The other end of capacitor C2, the other end of resistor R7, and the output terminal of operational amplifier U1A are all connected to one end of capacitor C3.

[0012] The other end of capacitor C2, the other end of resistor R7, the output terminal of operational amplifier U1A, and one end of capacitor C3 are all connected to the peak sampling module.

[0013] The other end of each capacitor C3 is connected to the signal secondary gain amplification module;

[0014] The negative terminal of the power supply is connected to one end of resistor R5. The other end of resistor R5 is connected to the other end of digital potentiometer R3 and one end of resistor R2. The other end of resistor R2 is connected to the inverting input terminal of operational amplifier U1A, one end of capacitor C1, and one end of resistor R6. The other ends of capacitor C1 and resistor R6 are both connected to a 1.65V power supply. The other end of capacitor C3 is connected to resistor R10. The other end of resistor R10 is connected to a 1.65V power supply. The upper port of operational amplifier U1A is grounded, and the lower port of operational amplifier U1A is connected to VCC.

[0015] Furthermore, the signal secondary gain amplification module includes resistor R10, resistor R14, capacitor C8, resistor R15, and operational amplifier U1B;

[0016] The other end of capacitor C3 is connected to one end of resistor R10 and the non-inverting input of operational amplifier U1B. The other end of resistor R13 is connected to a 1.65V power supply. The inverting input of operational amplifier U1B is connected to one end of resistor R14 and one end of resistor R15. The other end of resistor R14 is connected to one end of capacitor C8. The other end of capacitor C8 is connected to a 1.65V power supply. The output of operational amplifier U1B is connected to the other end of resistor R15, filter channel 4, and filter channel 5.

[0017] Furthermore, the filtered channel includes resistors R16, R17, and R20, capacitors C9, C14, and C13, and operational amplifier U3A.

[0018] One end of resistor R20 is connected to the other end of resistor R15 and the output terminal of operational amplifier U1B. The other end of resistor R20 is connected to one end of capacitor C9 and the non-inverting input terminal of operational amplifier U3A. The other end of capacitor C9 is connected to a 1.65V power supply. The upper end of operational amplifier U3A is connected to VCC. The inverting input terminal of operational amplifier U3A is connected to one end of capacitor C14 and one end of resistor R17. The other end of capacitor C14 is connected to one end of resistor R16 and one end of capacitor C13. The other end of capacitor C13 is connected to the other end of resistor R17 and the output terminal of operational amplifier U3A. The lower end of operational amplifier U3A is grounded.

[0019] The other end of capacitor C13, the other end of resistor R17, and the output of operational amplifier U3A are all connected to channel selection module 6.

[0020] Furthermore, the filtered two-channel circuit includes resistors R18, R19, and R21, capacitors C10, C11, and C12, and operational amplifier U3B.

[0021] One end of resistor R21 is connected to the other end of resistor R15 and the output terminal of operational amplifier U1B. The other end of resistor R21 is connected to the non-inverting input terminal of operational amplifier U3B and one end of capacitor C10. The other end of capacitor C10 is connected to a 1.65V power supply. The inverting input terminal of operational amplifier U3B is connected to one end of capacitor C11 and one end of resistor R18. The other end of capacitor C11 is connected to one end of resistor R19 and one end of capacitor C12. The other end of resistor R19 is connected to a 1.65V power supply. The other ends of resistor R18 and capacitor C12 are both connected to the output terminal of operational amplifier U3B.

[0022] The other end of resistor R18, the other end of capacitor C12, and the output of operational amplifier U3B are all connected to the channel selection module.

[0023] Furthermore, the channel selection module is a switch S1; the other end of capacitor C13, the other end of resistor R17, and the output terminal of operational amplifier U3A are all connected to the second port of switch S1; the other end of resistor R18, the other end of capacitor C12, and the output terminal of operational amplifier U3B are all connected to the third port of switch S1; the fourth port of switch S1 outputs a control signal; the fifth and eighth ports of switch S1 are both grounded; the first and sixth ports of switch S1 are both connected to VCC; and the seventh port of switch S1 is connected to the phase adjustment module.

[0024] Furthermore, the phase adjustment module includes a second digital potentiometer R22, a resistor R23, a capacitor C15, a capacitor C16, and an operational amplifier U4A. The seventh port of the switch S1 is connected to one end of the second digital potentiometer R22. The other end of the second digital potentiometer R22 is connected to one end of the capacitor C16 and the non-inverting input of the operational amplifier U4A. The other end of the capacitor C16 is connected to a 1.65V power supply. The inverting input of the operational amplifier U4A is connected to one end of the resistor R23 and one end of the capacitor C15. The other end of the capacitor C15 is connected to the output of the operational amplifier U4A. The other end of the resistor R23 is connected to a 1.65V power supply. The other end of the capacitor C15 and the output of the operational amplifier U4A are used to output signals.

[0025] Furthermore, the peak sampling module includes resistors R24, R25, and R26, capacitor C17, diode D2, operational amplifier U5A, and operational amplifier U5B. One end of resistor R26 is connected to the other end of capacitor C2, the other end of resistor R7, the output terminal of operational amplifier U1A, and one end of capacitor C3. The other end of resistor R26 is connected to the non-inverting input terminal of operational amplifier U5A. The inverting input terminal of operational amplifier U5A is connected to one end of resistor R25. The other end of resistor R25 is connected to the inverting input terminal and the output terminal of operational amplifier U5B. The upper end of operational amplifier U5A is grounded, and the lower end of operational amplifier U5A is connected to VCC. The output terminal of operational amplifier U5A is electrically connected to one end of diode D2. The other end of diode D2 is connected to one end of resistor R24, one end of capacitor C17, and the non-inverting input terminal of operational amplifier U5B. The other ends of resistor R24 ​​and capacitor C17 are both grounded.

[0026] Furthermore, the reference circuit module includes polarized capacitor C4, polarized capacitor C5, resistor R8, resistor R9, and operational amplifier U4B;

[0027] One end of the polarized capacitor C5 is connected to VCC. VCC is connected to one end of resistor R8 and the upper end of operational amplifier U4B. The other end of the polarized capacitor C5 is connected to one end of the polarized capacitor C4, the other end of resistor R8, one end of resistor R9, and the non-inverting input of operational amplifier U4B. The other ends of the polarized capacitor C4 and resistor R9 are grounded. The inverting input and output of operational amplifier U4B are connected to a 1.65V power supply.

[0028] Furthermore, the first and seventeenth ports of the MCU are both connected to a 3V power supply. The fifth port of the MCU is connected to one end of inductor L1, and the other end of inductor L1 is connected to a 3V power supply. The fourth port of the MCU is connected to one end of resistor R60 and one end of capacitor C52. The other end of resistor R60 is connected to a 3V power supply, and the other end of capacitor C52 is grounded. The thirty-first port of the MCU is connected to one end of resistor R24, and the other end of resistor R24 ​​is grounded. The twenty-eighth port of the MCU is connected to one end of resistor R19, and the other end of resistor R19 is connected to one end of capacitor C12. The other end of capacitor C12 and the sixteenth port of the MCU are both grounded.

[0029] The second port of the MCU is connected to one end of capacitor C13 and one end of crystal oscillator X1. The other end of capacitor C13 is grounded. The third port of the MCU is connected to one end of capacitor C17 and the other end of crystal oscillator X1. The other end of capacitor C17 is grounded.

[0030] Compared with the existing technology, the advantages of this utility model are as follows: 1. The filtering method adopted by the electronic components of this utility model is: a multi-stage amplification method, that is, a low-pass amplifier plus a high-pass amplifier to meet the gain of a wider frequency band.

[0031] 2. This utility model uses a digital potentiometer R3 to control the gain; it achieves automatic channel switching, uses two channels to meet a wide phase change range; and uses a second digital potentiometer R22 to automatically adjust the phase change to obtain the optimal phase.

[0032] 3. This utility model uses band switches to set different switching delay times for different structures. All calibration data, delay, vibration amplitude, gain setting, phase value, and channel selection are automatically stored in the MCU's non-volatile memory. Periodic self-tests can determine whether the instrument's technical performance has deviated and identify whether recalibration is required.

[0033] 4. This utility model reduces the variety of electronic modules, improves their applicability and intelligence, enhances the overall applicability of the machine, and facilitates the assessment of instrument reliability and extends service life through self-diagnosis, thereby improving product production efficiency and enabling quick and convenient automatic maintenance in applications. Attached Figure Description

[0034] Figure 1 This is a connection block diagram of an intelligent vibration switch circuit for this utility model;

[0035] Figure 2 This is a circuit diagram of an intelligent vibration switch circuit for this practical application;

[0036] Figure 3 This is the circuit diagram of the primary gain module for this practical application.

[0037] Figure 4 This is the circuit diagram of the practical signal two-stage gain amplifier module;

[0038] Figure 5 This is a practical circuit diagram of a single channel with filtering.

[0039] Figure 6 This is a practical circuit diagram of a two-channel circuit with filtering.

[0040] Figure 7 Circuit diagram of this practical channel selection module;

[0041] Figure 8 Circuit diagram of this practical phase adjustment module;

[0042] Figure 9 Circuit diagram of this practical peak sampling module;

[0043] Figure 10 The circuit diagram of this practical reference circuit module;

[0044] Figure 11 This is a circuit diagram of a practical MCU.

[0045] The labels in the diagram represent:

[0046] 1. Sensor module; 2. Primary signal gain module; 3. Secondary signal gain amplification module; 4. One-channel with filter; 5. Two-channel with filter; 6. Channel selection module; 7. MCU; 8. Phase adjustment module; 9. Peak sampling module; 10. Power supply module; 11. Reference circuit module. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0048] The terminology used in this utility model is for the purpose of describing particular embodiments only and is not intended to limit the utility model. The singular forms “a,” “the,” and “the” used in this utility model and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0049] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0050] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0051] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0052] Example 1: In some embodiments, please refer to the accompanying drawings. Figures 1-11A smart vibration switch circuit includes a sensor module 1 and a reference circuit module 11 for generating a mid-level (1.65V) voltage. The sensor module 1 includes a signal input terminal and a signal output terminal. The signal output terminal of the sensor module 1 is connected to the first signal input terminal of a signal secondary gain amplification module 3. The signal output terminal of an MCU 7 is connected to the second signal input terminal of the signal secondary gain amplification module 3 through a primary signal gain module 2. The two signal output terminals of the signal secondary gain amplification module 3 are respectively connected to the signal input terminals of a filter channel 4 and a filter channel 5. The signal output terminals of the filter channel 4 and the filter channel 5 are respectively connected to the two signal input terminals of a channel selection module 6. The signal output terminal of the channel selection module 6 is connected to the signal input terminal of the MCU 7. The signal output terminal of the MCU 7 is connected to the signal input terminal of a phase adjustment module 8. The signal output terminal of the phase adjustment module 8 is connected to the signal input terminal of a peak sampling module 9. The signal output terminal of the peak sampling module 9 is connected to the signal input terminal of the sensor module 1. A power supply module 10 is connected to both the peak sampling module 9 and the MCU 7 and provides them with power.

[0053] The non-volatile memory of the MCU7 stores all calibration data, delay, vibration amplitude, gain setting, phase value, and channel selection.

[0054] The MCU7 can realize the output of digital relays, self-test and automatic calibration, and delay setting of switching sensitivity.

[0055] The primary gain module 2 is used to simulate the input of a frequency signal and amplify it before inputting it into the secondary gain module 3; the primary gain module 2 is a low-pass signal amplifier, and the secondary gain module 3 is a high-pass amplifier.

[0056] The primary gain module 2 includes resistors R1 and R2, a digital potentiometer R3, R4, R5, R6, and R7, capacitors C1, C2, and C3, and an operational amplifier U1A.

[0057] The digital potentiometer R3 is used to control the magnitude of the input signal;

[0058] The positive terminal of the power supply is connected to one end of resistor R4. The other end of resistor R4 is connected to one end of digital potentiometer R3 and one end of resistor R1. The other end of digital potentiometer R3 is connected to the slider of digital potentiometer R3. The other end of resistor R1 is connected to one end of capacitor C2, one end of resistor R7, and the non-inverting input terminal of operational amplifier U1A. The other end of capacitor C2, the other end of resistor R7, and the output terminal of operational amplifier U1A are all connected to one end of capacitor C3.

[0059] The other end of capacitor C2, the other end of resistor R7, the output terminal of operational amplifier U1A, and one end of capacitor C3 are all connected to peak sampling module 9;

[0060] The other end of each capacitor C3 is connected to the signal secondary gain amplification module 3;

[0061] The negative terminal of the power supply is connected to one end of resistor R5. The other end of resistor R5 is connected to the other end of digital potentiometer R3 and one end of resistor R2. The other end of resistor R2 is connected to the inverting input terminal of operational amplifier U1A, one end of capacitor C1, and one end of resistor R6. The other ends of capacitor C1 and resistor R6 are both connected to a 1.65V power supply. The other end of capacitor C3 is connected to resistor R10. The other end of resistor R10 is connected to a 1.65V power supply. The upper port of operational amplifier U1A is grounded, and the lower port of operational amplifier U1A is connected to VCC.

[0062] The operational amplifiers used in this application are all of the AD8532AR type.

[0063] This circuit can standardize the AC voltage signal from the input piezoelectric ceramic into a fixed-amplitude AC signal by adjusting the value of the digital potentiometer R3.

[0064] The signal secondary gain amplification module 3 includes resistor R10, resistor R14, capacitor C8, resistor R15, and operational amplifier U1B;

[0065] The other end of capacitor C3 is connected to one end of resistor R10 and the non-inverting input of operational amplifier U1B. The other end of resistor R13 is connected to a 1.65V power supply. The inverting input of operational amplifier U1B is connected to one end of resistor R14 and one end of resistor R15. The other end of resistor R14 is connected to one end of capacitor C8. The other end of capacitor C8 is connected to a 1.65V power supply. The output of operational amplifier U1B is connected to the other end of resistor R15, filter channel 4, and filter channel 5.

[0066] The reference circuit module 11 includes a polarized capacitor C4, a polarized capacitor C5, a resistor R8, a resistor R9, and an operational amplifier U4B.

[0067] One end of the polarized capacitor C5 is connected to VCC. VCC is connected to one end of resistor R8 and the upper end of operational amplifier U4B. The other end of the polarized capacitor C5 is connected to one end of the polarized capacitor C4, the other end of resistor R8, one end of resistor R9, and the non-inverting input of operational amplifier U4B. The other ends of the polarized capacitor C4 and resistor R9 are grounded. The inverting input and output of operational amplifier U4B are connected to a 1.65V power supply.

[0068] The filtered channel 4 includes resistors R16, R17, and R20, capacitors C9, C14, and C13, and operational amplifier U3A.

[0069] One end of resistor R20 is connected to the other end of resistor R15 and the output terminal of operational amplifier U1B. The other end of resistor R20 is connected to one end of capacitor C9 and the non-inverting input terminal of operational amplifier U3A. The other end of capacitor C9 is connected to a 1.65V power supply. The upper end of operational amplifier U3A is connected to VCC. The inverting input terminal of operational amplifier U3A is connected to one end of capacitor C14 and one end of resistor R17. The other end of capacitor C14 is connected to one end of resistor R16 and one end of capacitor C13. The other end of capacitor C13 is connected to the other end of resistor R17 and the output terminal of operational amplifier U3A. The lower end of operational amplifier U3A is grounded.

[0070] The other end of capacitor C13, the other end of resistor R17, and the output of operational amplifier U3A are all connected to channel selection module 6.

[0071] The filtered two-channel 5 includes resistors R18, R19, and R21, capacitors C10, C11, and C12, and operational amplifier U3B;

[0072] One end of resistor R21 is connected to the other end of resistor R15 and the output terminal of operational amplifier U1B. The other end of resistor R21 is connected to the non-inverting input terminal of operational amplifier U3B and one end of capacitor C10. The other end of capacitor C10 is connected to a 1.65V power supply. The inverting input terminal of operational amplifier U3B is connected to one end of capacitor C11 and one end of resistor R18. The other end of capacitor C11 is connected to one end of resistor R19 and one end of capacitor C12. The other end of resistor R19 is connected to a 1.65V power supply. The other ends of resistor R18 and capacitor C12 are both connected to the output terminal of operational amplifier U3B.

[0073] The other end of resistor R18, the other end of capacitor C12, and the output of operational amplifier U3B are all connected to channel selection module 6.

[0074] By replacing capacitors C13 and C14 in band-filtered channel 4 with capacitors C11 and C12, and resistors R16 and R17 with resistors R19 and R18, different center frequencies and bandwidths can be obtained in the two-channel band filter.

[0075] The channel selection module 6 is a switch S1;

[0076] The other end of capacitor C13, the other end of resistor R17, and the output terminal of operational amplifier U3A are all connected to the second port of switch S1. The other end of resistor R18, the other end of capacitor C12, and the output terminal of operational amplifier U3B are all connected to the third port of switch S1. The fourth port of switch S1 outputs a control signal. The fifth and eighth ports of switch S1 are both grounded. The first and sixth ports of switch S1 are both connected to VCC. The seventh port of switch S1 is connected to the phase adjustment module 8.

[0077] The switch S1 is a MAX319CJA analog switch.

[0078] The phase adjustment module 8 includes a second digital potentiometer R22, a resistor R23, a capacitor C15, a capacitor C16, and an operational amplifier U4A. The seventh port of the switch S1 is connected to one end of the second digital potentiometer R22. The other end of the second digital potentiometer R22 is connected to one end of the capacitor C16 and the non-inverting input of the operational amplifier U4A. The other end of the capacitor C16 is connected to a 1.65V power supply. The inverting input of the operational amplifier U4A is connected to one end of the resistor R23 and one end of the capacitor C15. The other end of the capacitor C15 is connected to the output of the operational amplifier U4A. The other end of the resistor R23 is connected to a 1.65V power supply. The other end of the capacitor C15 and the output of the operational amplifier U4A are used to output signals.

[0079] The peak sampling module 9 is used to measure the magnitude of the signal;

[0080] The peak sampling module 9 includes resistors R24, R25, and R26, capacitor C17, diode D2, operational amplifier U5A, and operational amplifier U5B;

[0081] One end of resistor R26 is connected to the other end of capacitor C2, the other end of resistor R7, the output terminal of operational amplifier U1A, and one end of capacitor C3. The other end of resistor R26 is connected to the non-inverting input terminal of operational amplifier U5A. The inverting input terminal of operational amplifier U5A is connected to one end of resistor R25. The other end of resistor R25 is connected to the inverting input terminal and the output terminal of operational amplifier U5B. The upper end of operational amplifier U5A is grounded, and the lower end of operational amplifier U5A is connected to VCC. The output terminal of operational amplifier U5A is electrically connected to one end of diode D2. The other end of diode D2 is connected to one end of resistor R24, one end of capacitor C17, and the non-inverting input terminal of operational amplifier U5B. The other ends of resistor R24 ​​and capacitor C17 are grounded.

[0082] The channel selection module 6 controls the selection of channels, allowing the output of a signal from one of the desired channels. The output phase can be changed by controlling the second digital potentiometer R22 in the control diagram to obtain a better output effect.

[0083] The first and seventeenth ports of MCU7 are both connected to a 3V power supply. The fifth port of MCU7 is connected to one end of inductor L1, and the other end of inductor L1 is connected to a 3V power supply. The fourth port of MCU7 is connected to one end of resistor R60 and one end of capacitor C52. The other end of resistor R60 is connected to a 3V power supply, and the other end of capacitor C52 is grounded. The thirty-first port of MCU7 is connected to one end of resistor R24, and the other end of resistor R24 ​​is grounded. The twenty-eighth port of MCU7 is connected to one end of resistor R19, and the other end of resistor R19 is connected to one end of capacitor C12. The other end of capacitor C12 and the sixteenth port of MCU7 are both grounded.

[0084] The second port of MCU7 is connected to one end of capacitor C13 and one end of crystal oscillator X1. The other end of capacitor C13 is grounded. The third port of MCU7 is connected to one end of capacitor C17 and the other end of crystal oscillator X1. The other end of capacitor C17 is grounded.

[0085] like Figure 11 As shown, U5 includes 8 pins. The first pin is connected to the seventh pin, the second pin is connected to a 3V power supply, the third pin is grounded, the fourth and fifth pins use I2C communication, and the sixth pin is connected to one end of R61, while the other end of R61 is grounded. Here, U5 is equivalent to the digital potentiometer R3 in the primary gain module 2 of the signal circuit. It realizes the function of controlling the signal gain of the digital potentiometer R3 through I2C communication.

[0086] U7 has 8 pins. The second pin is connected to a 3V power supply. The fourth and fifth pins use I2C communication. The sixth pin is connected to one end of R62. The other end of R62 is connected to a 3V power supply. Here, U7 is equivalent to resistor R1 in the primary gain module 2 of the signal.

[0087] This utility implements the function of controlling the signal gain of digital potentiometer R3 and resistor R1 through I2C communication.

[0088] Example 2: In some embodiments, such as Figure 4 As shown in the preferred embodiment of this utility model, the MCU7 can determine the frequency range of the input signal based on the frequency of the vibration signal and the amplitude of the output, and then determine which channel to use through channel selection. The MCU7 can also determine whether the vibration switch is a tuning fork vibration switch or a vibrating rod vibration switch.

[0089] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. All equivalent changes and modifications made within the scope of the claims of this utility model should fall within the technical scope of this utility model.

Claims

1. An intelligent vibration switch circuit, characterized in that: it includes a sensor module (1) and a reference circuit module (11) for generating a mid-level, wherein the sensor module (1) includes a signal input terminal and a signal output terminal, the signal output terminal of the sensor module (1) is connected to the first signal input terminal of the signal secondary gain amplification module (3), and the signal output terminal of the MCU (7) is connected to the second signal input terminal of the signal secondary gain amplification module (3) through the signal primary gain module (2); The two signal output terminals of the signal secondary gain amplification module (3) are connected to the signal input terminals of the filter channel 1 (4) and the filter channel 2 (5) respectively. The signal output terminals of the filter channel 1 (4) and the filter channel 2 (5) are connected to the two signal input terminals of the channel selection module (6) respectively. The signal output terminal of the channel selection module (6) is connected to the signal input terminal of the MCU (7). The signal output terminal of the MCU (7) is connected to the signal input terminal of the phase adjustment module (8). The signal output terminal of the phase adjustment module (8) is connected to the signal input terminal of the peak sampling module (9). The signal output terminal of the peak sampling module (9) is connected to the signal input terminal of the sensor module (1). The power supply module (10) is connected to both the peak sampling module (9) and the MCU (7) and provides them with power.

2. The intelligent vibration switch circuit according to claim 1, characterized in that, The primary gain module (2) includes resistors (R1), (R2), digital potentiometer (R3), resistors (R4), (R5), (R6), (R7), capacitors (C1), (C2), (C3), and operational amplifier (U1A). The positive terminal of the power supply is connected to one end of the resistor (R4). The other end of the resistor (R4) is connected to one end of the digital potentiometer (R3) and one end of the resistor (R1). The other end of the digital potentiometer (R3) is connected to the slider of the digital potentiometer (R3). The other end of the resistor (R1) is connected to one end of the capacitor (C2), one end of the resistor (R7), and the non-inverting input terminal of the operational amplifier (U1A). The other end of the capacitor (C2), the other end of the resistor (R7), and the output terminal of the operational amplifier (U1A) are all connected to one end of the capacitor (C3). The other end of capacitor (C2), the other end of resistor (R7), the output terminal of operational amplifier (U1A), and one end of capacitor (C3) are all connected to peak sampling module (9); The other end of each capacitor (C3) is connected to the signal secondary gain amplification module (3); The negative terminal of the power supply is connected to one end of resistor (R5). The other end of resistor (R5) is connected to the other end of digital potentiometer (R3) and one end of resistor (R2). The other end of resistor (R2) is connected to the inverting input terminal of operational amplifier (U1A), one end of capacitor (C1), and one end of resistor (R6). The other ends of capacitor (C1) and resistor (R6) are both connected to a 1.65V power supply. The other end of capacitor (C3) is connected to resistor (R10). The other end of resistor (R10) is connected to a 1.65V power supply. The upper port of operational amplifier (U1A) is grounded, and the lower port of operational amplifier (U1A) is connected to VCC.

3. The intelligent vibration switch circuit according to claim 2, characterized in that, The signal secondary gain amplification module (3) includes resistor (R10), resistor (R14), capacitor (C8), resistor (R15) and operational amplifier (U1B). The other end of capacitor (C3) is connected to one end of resistor (R10) and the non-inverting input of operational amplifier (U1B). The other end of resistor (R13) is connected to a 1.65V power supply. The inverting input of operational amplifier (U1B) is connected to one end of resistor (R14) and one end of resistor (R15). The other end of resistor (R14) is connected to one end of capacitor (C8). The other end of capacitor (C8) is connected to a 1.65V power supply. The output of operational amplifier (U1B) is connected to the other end of resistor (R15), the first filter channel (4), and the second filter channel (5).

4. The intelligent vibration switch circuit according to claim 3, characterized in that, The filtered channel (4) includes resistors (R16), (R17), (R20), capacitors (C9), (C14), (C13), and an operational amplifier (U3A). One end of the resistor (R20) is connected to the other end of the resistor (R15) and the output terminal of the operational amplifier (U1B). The other end of the resistor (R20) is connected to one end of the capacitor (C9) and the non-inverting input terminal of the operational amplifier (U3A). The other end of the capacitor (C9) is connected to a 1.65V power supply. The upper end of the operational amplifier (U3A) is connected to VCC. The inverting input terminal of the operational amplifier (U3A) is connected to one end of the capacitor (C14) and one end of the resistor (R17). The other end of the capacitor (C14) is connected to one end of the resistor (R16) and one end of the capacitor (C13). The other end of the capacitor (C13) is connected to the other end of the resistor (R17) and the output terminal of the operational amplifier (U3A). The lower end of the operational amplifier (U3A) is grounded. The other end of the capacitor (C13), the other end of the resistor (R17), and the output of the operational amplifier (U3A) are all connected to the channel selection module (6).

5. The intelligent vibration switch circuit according to claim 4, characterized in that, The filtered two-channel (5) includes resistors (R18), (R19), (R21), capacitors (C10), (C11), (C12), and an operational amplifier (U3B). One end of the resistor (R21) is connected to the other end of the resistor (R15) and the output terminal of the operational amplifier (U1B). The other end of the resistor (R21) is connected to the non-inverting input terminal of the operational amplifier (U3B) and one end of the capacitor (C10). The other end of the capacitor (C10) is connected to a 1.65V power supply. The inverting input terminal of the operational amplifier (U3B) is connected to one end of the capacitor (C11) and one end of the resistor (R18). The other end of the capacitor (C11) is connected to one end of the resistor (R19) and one end of the capacitor (C12). The other end of the resistor (R19) is connected to a 1.65V power supply. The other ends of the resistor (R18) and the other end of the capacitor (C12) are both connected to the output terminal of the operational amplifier (U3B). The other end of the resistor (R18), the other end of the capacitor (C12), and the output of the operational amplifier (U3B) are all connected to the channel selection module (6).

6. The intelligent vibration switch circuit according to claim 5, characterized in that, The channel selection module (6) is a switch (S1); the other end of the capacitor (C13), the other end of the resistor (R17), and the output terminal of the operational amplifier (U3A) are all connected to the second port of the switch (S1); the other end of the resistor (R18), the other end of the capacitor (C12), and the output terminal of the operational amplifier (U3B) are all connected to the third port of the switch (S1); the fourth port of the switch (S1) outputs a control signal; the fifth and eighth ports of the switch (S1) are both grounded; the first and sixth ports of the switch (S1) are both connected to VCC; and the seventh port of the switch (S1) is connected to the phase adjustment module (8).

7. The intelligent vibration switch circuit according to claim 6, characterized in that, The phase adjustment module (8) includes a second digital potentiometer (R22), a resistor (R23), a capacitor (C15), a capacitor (C16), and an operational amplifier (U4A). The seventh port of the switch (S1) is connected to one end of the second digital potentiometer (R22). The other end of the second digital potentiometer (R22) is connected to one end of the capacitor (C16) and the non-inverting input of the operational amplifier (U4A). The other end of the capacitor (C16) is connected to a 1.65V power supply. The inverting input of the operational amplifier (U4A) is connected to one end of the resistor (R23) and one end of the capacitor (C15). The other end of the capacitor (C15) is connected to the output of the operational amplifier (U4A). The other end of the resistor (R23) is connected to a 1.65V power supply. The other end of the capacitor (C15) and the output of the operational amplifier (U4A) are used to output signals.

8. The intelligent vibration switch circuit according to claim 7, characterized in that, The peak sampling module (9) includes resistors (R24), (R25), (R26), capacitor (C17), diode (D2), operational amplifier (U5A), and operational amplifier (U5B). One end of the resistor (R26) is connected to the other end of the capacitor (C2), the other end of the resistor (R7), the output terminal of the operational amplifier (U1A), and one end of the capacitor (C3). The other end of the resistor (R26) is connected to the non-inverting input terminal of the operational amplifier (U5A). The inverting input terminal of the operational amplifier (U5A) is connected to one end of the resistor (R25). The other end of the resistor (R25) is connected to the inverting input terminal and the output terminal of the operational amplifier (U5B). The upper end of the operational amplifier (U5A) is grounded, and the lower end of the operational amplifier (U5A) is connected to VCC. The output terminal of the operational amplifier (U5A) is electrically connected to one end of the diode (D2). The other end of the diode (D2) is connected to one end of the resistor (R24), one end of the capacitor (C17), and the non-inverting input terminal of the operational amplifier (U5B). The other ends of the resistor (R24) and the other end of the capacitor (C17) are both grounded.

9. The intelligent vibration switch circuit according to claim 8, characterized in that, The reference circuit module (11) includes a polarized capacitor (C4), a polarized capacitor (C5), a resistor (R8), a resistor (R9), and an operational amplifier (U4B). One end of the polarized capacitor (C5) is connected to VCC. VCC is connected to one end of the resistor (R8) and the upper end of the operational amplifier (U4B). The other end of the polarized capacitor (C5) is connected to one end of the polarized capacitor (C4), the other end of the resistor (R8), one end of the resistor (R9), and the non-inverting input of the operational amplifier (U4B). The other ends of the polarized capacitor (C4) and the other end of the resistor (R9) are grounded. The inverting input and output of the operational amplifier (U4B) are both connected to a 1.65V power supply.

10. The intelligent vibration switch circuit according to claim 9, characterized in that, The first and seventeenth ports of MCU (7) are connected to a 3V power supply. The fifth port of MCU (7) is connected to one end of an inductor (L1), and the other end of the inductor (L1) is connected to a 3V power supply. The fourth port of MCU (7) is connected to one end of a resistor (R60) and one end of a capacitor (C52). The other end of the resistor (R60) is connected to a 3V power supply, and the other end of the capacitor (C52) is grounded. The thirty-first port of MCU (7) is connected to one end of a resistor (R24), and the other end of the resistor (R24) is grounded. The twenty-eighth port of MCU (7) is connected to one end of a resistor (R19), and the other end of the resistor (R19) is connected to one end of a capacitor (C12). The other end of the capacitor (C12) and the sixteenth port of MCU (7) are both grounded. The second port of MCU (7) is connected to one end of capacitor (C13), and one end of crystal oscillator (X1) is also connected. The other end of capacitor (C13) is grounded. The third port of MCU (7) is connected to one end of capacitor (C17) and the other end of crystal oscillator (X1). The other end of capacitor (C17) is grounded.

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