CN115014506B - Vibration detection circuit and portable instrument - Google Patents
Vibration detection circuit and portable instrument Download PDFInfo
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- CN115014506B CN115014506B CN202210941006.3A CN202210941006A CN115014506B CN 115014506 B CN115014506 B CN 115014506B CN 202210941006 A CN202210941006 A CN 202210941006A CN 115014506 B CN115014506 B CN 115014506B
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- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
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Abstract
The application relates to the technical field of vibration detection, in particular to a vibration detection circuit and a portable instrument, wherein the vibration detection circuit comprises a pre-amplification circuit, a main amplification circuit and a comparison circuit; the input end of the preamplification circuit is used for connecting the impact vibration sensor, the output end of the preamplification circuit is connected with the input end of the main amplification circuit, the output end of the main amplification circuit is connected with the input end of the comparison circuit, and the output end of the comparison circuit is used for connecting the control module; the pre-amplification circuit is used for amplifying the signal A sent by the impact vibration sensor and outputting a signal B, and the signal B is in a range capable of being received by the main amplification circuit; the main amplifying circuit is used for amplifying the B signal again and outputting a C signal; and the comparison circuit compares the C signal with a set threshold value and outputs a high level signal or a low level signal to a control module for outputting a judgment result. This application has the effect of distinguishing whether the vibration can produce the influence to portable instrument.
Description
Technical Field
The application relates to the technical field of vibration detection, in particular to a vibration detection circuit and a portable instrument.
Background
With the development of science and technology, people make various types of instruments for detection, and develop from a large-size immovable fixed instrument to a small-size movable portable instrument, so that the portable instrument is convenient to use, can move, and is not easily limited by the field environment.
However, the portable instrument has a drawback, and especially in some scenes where precise detection is required, there are possibilities that vibration is generated artificially and vibration is generated by a field environment, and the portable instrument is easily affected by the vibration, and the detection result of the portable instrument is inaccurate after the portable instrument is affected by the vibration.
Disclosure of Invention
In order to distinguish whether vibration can influence a portable instrument, the application provides a vibration detection circuit and a portable instrument.
In a first aspect, the present application provides a vibration detection circuit, which adopts the following technical scheme:
a vibration detection circuit comprises a pre-amplification circuit, a main amplification circuit and a comparison circuit; the input end of the pre-amplification circuit is used for connecting an impact vibration sensor, the output end of the pre-amplification circuit is connected to the input end of the main amplification circuit, the output end of the main amplification circuit is connected to the input end of the comparison circuit, and the output end of the comparison circuit is used for connecting a control module;
the pre-amplification circuit is used for amplifying the signal A sent by the impact vibration sensor and outputting a signal B, and the signal B is in a range capable of being received by the main amplification circuit;
the main amplifying circuit is used for amplifying the B signal again and outputting a C signal;
and the comparison circuit compares the C signal with a set threshold value and outputs a high-level signal or a low-level signal to a control module for outputting a judgment result.
By adopting the technical scheme, the pre-amplification circuit receives the A signal sent by the impact vibration sensor, amplifies the A signal and outputs the B signal, so that the B signal is in a range capable of being received and amplified by the main amplification circuit, the main amplification circuit amplifies the B signal and outputs the C signal, the C signal is input to the comparison circuit, the comparison circuit compares the C signal with a set threshold value, so that a high-level signal or a low-level signal is output, the control module receives the high-level signal or the low-level signal and outputs a judgment result, namely the vibration lower than the threshold value can be ignored, at the moment, almost no influence is caused on the portable instrument, the vibration higher than the threshold value can influence the portable instrument, the vibration detection circuit can detect whether the vibration exceeds the threshold value, and therefore a worker can distinguish whether the vibration can influence the accuracy of the detection result of the portable instrument.
Optionally, the pre-amplifier circuit includes an input terminal S, MOS tube F1 and an operational amplifier U1, a gate of the MOS tube F1 is connected with a capacitor C1, the other end of the capacitor C1 is connected to the input terminal S, the input terminal S is connected with a resistor R1, the other end of the resistor R1 is connected to the power supply terminal, a drain of the MOS tube F1 is connected to a resistor R3, the other end of the resistor R3 is used for connecting the power supply terminal, the drain of the MOS tube F1 is further connected to the positive input terminal of the operational amplifier U1, a source of the MOS tube F1 is connected to a resistor R5, the other end of the resistor R5 is connected to the negative input terminal of the operational amplifier U1, the negative input terminal of the operational amplifier U1 is further connected to a resistor R4, the other end of the resistor R4 is connected to the power supply terminal, a positive electrode of the operational amplifier U1 is connected to the power supply terminal, a negative electrode of the operational amplifier U1 is connected to a ground terminal GND _ Q, an output terminal of the operational amplifier U1 is connected to a capacitor C2, the other end of the capacitor C2 is connected to the capacitor C1, and the source of the MOS tube F1 is connected in parallel to a reference voltage circuit.
Through adopting above-mentioned technical scheme, amplify A signal to output the B signal after the amplification, so that B signal can be received by main amplifier circuit, wherein MOS pipe F1 can reduce the noise influence. The reference voltage circuit is used for providing a reference voltage value for the operational amplifier U1 and also providing a reference voltage value for the MOS tube F1.
Optionally, the reference voltage circuit includes a reference voltage chip U5, a capacitor C11 and a capacitor C12, an input pin of the reference voltage chip U5 is used for connecting a power supply end, the input pin of the reference voltage chip U5 is further connected to the capacitor C11, the other end of the capacitor C11 is connected to a ground end GND _ Q, the capacitor C12 is connected in parallel with the capacitor C11, a ground pin of the reference voltage chip U5 is connected to the ground end GND _ Q, and an output pin of the reference voltage chip U5 is connected to the source of the MOS transistor F1.
By adopting the technical scheme, the output pin of the reference voltage chip U5 outputs stable voltage so as to provide a reference voltage value, and the capacitor C11 and the capacitor C12 are used for filtering so as to enable the input voltage of the reference voltage chip U5 to be more stable and further enable the output voltage of the reference voltage chip U5 to be more stable.
Optionally, the main amplifying circuit includes a first amplifying circuit, the first amplifying circuit includes an operational amplifier U2, a resistor R6, a resistor R7 and a capacitor C4, a negative input end of the operational amplifier U2 is connected to the resistor R6, the other end of the resistor R6 is connected to an input end of the first amplifying circuit, an input end of the first amplifying circuit is connected to an input end of the main amplifying circuit, a negative input end of the operational amplifier U2 is further connected to the resistor R7, the other end of the resistor R7 is connected to an output end of the operational amplifier U2, the capacitor C4 is connected in parallel to the resistor R7, a positive input end of the operational amplifier U2 is connected to the source of the MOS transistor F1, an output end of the operational amplifier U2 is connected to an output end of the first amplifying circuit, and an output end of the first amplifying circuit is connected to an output end of the main amplifying circuit.
By adopting the technical scheme, the B signal is amplified so as to enable the signal to be subjected to subsequent processing, and the reference voltage value of the operational amplifier U2 is provided by the reference voltage circuit.
Optionally, the main amplifying circuit further includes a second amplifying circuit, the second amplifying circuit includes an operational amplifier U3, a resistor R8, a resistor R9 and a capacitor C5, a negative input end of the operational amplifier U3 is connected to the resistor R8, the other end of the resistor R8 is connected to an input end of the second amplifying circuit, an input end of the second amplifying circuit is connected to an output end of the first amplifying circuit, a negative input end of the operational amplifier U3 is further connected to the resistor R9, the other end of the resistor R9 is connected to an output end of the operational amplifier U3, the capacitor C5 is connected in parallel to the resistor R9, a negative electrode of the operational amplifier U3 is connected to a ground end GND _ Q, a positive electrode of the operational amplifier U3 is connected to the power supply end, an output end of the operational amplifier U3 is connected to an output end of the second amplifying circuit, and an output end of the second amplifying circuit is connected to an output end of the main amplifying circuit.
By adopting the technical scheme, the signal output by the first amplifying circuit is amplified again and output, so that the signal can be processed subsequently. The reference voltage circuit provides a reference voltage value for the operational amplifier U3.
Optionally, the comparison circuit includes a comparator U4, a resistor R10, a resistor R11, a resistor R12, a variable resistor R13, a resistor R14, a resistor R15, and a capacitor C13, a negative input end of the comparator U4 is connected to the resistor R11, the other end of the resistor R11 is connected to an input end of the comparison circuit, an input end of the comparison circuit is further connected to the resistor R10, the other end of the resistor R10 is connected to a ground GND _ Q, a positive input end of the comparator U4 is connected to the variable resistor R13, the other end of the variable resistor R13 is connected to the ground GND _ Q, the capacitor C13 is connected in parallel to the variable resistor R13, a positive input end of the comparator U4 is further connected to the resistor R12, the other end of the resistor R12 is connected to the power supply terminal, a pin 4-5 of the comparator U4 is connected to the power supply terminal, a pin 4-2 of the comparator U4 is connected to the ground GND, a pin 4-1 of the comparator U4 is connected to the resistor R15, the other end of the comparator R15 is connected to an output terminal of the comparator circuit, and the comparator control module is connected to the power supply terminal of the resistor R14.
By adopting the technical scheme, the variable resistor R13 and the resistor R12 are used for voltage division so as to provide a set threshold value, the threshold value is compared with the received C signal, so that a high level signal or a low level signal is output, the control module outputs a judgment result, the circuit can be used for directly judging so as to output the level signal, and the control module can obtain the judgment result according to the level signal so as to output the judgment result. The set threshold can be adjusted according to the requirement by changing the resistance value of the variable resistor R13.
Optionally, the power supply circuit is further included, the power supply circuit is used for connecting a power supply end, and the pre-amplification circuit, the main amplification circuit and the comparison circuit are all electrically connected with the power supply circuit
By adopting the technical scheme, the power supply circuit is connected with the power supply end so as to supply power to other circuits.
Optionally, the power supply circuit further includes a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, and a resistor R0, one end of the capacitor C10 is connected to the power supply terminal, the other end of the capacitor C10 is connected to a ground terminal GND _ P, one end of the capacitor C7 is connected to the power supply terminal, the other end of the capacitor C7 is connected to a ground terminal GND _ Q, the capacitor C8 is connected in parallel with the capacitor C7, the capacitor C9 is also connected in parallel with the capacitor C7, one end of the resistor R0 is connected to the ground terminal GND _ P, and the other end of the resistor R0 is connected to the ground terminal GND _ Q.
By adopting the technical scheme, the capacitor is used for filtering, so that the power supply voltage is more stable.
In a second aspect, the present application provides a portable device, which adopts the following technical solutions:
a portable instrument comprising a vibration detection circuit as described in the first aspect.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the pre-amplification circuit receives the A signal sent by the impact vibration sensor, amplifies the A signal and outputs the B signal, so that the B signal is in a range capable of being received and amplified by the main amplification circuit, the main amplification circuit amplifies the B signal and outputs the C signal, the C signal is input to the comparison circuit, the comparison circuit compares the C signal with a set threshold value, so that a high-level signal or a low-level signal is output, the control module receives the high-level signal or the low-level signal and outputs a judgment result, namely the vibration lower than the threshold value can be ignored, at the moment, almost no influence is caused on the portable instrument, the vibration higher than the threshold value can influence the portable instrument, the vibration detection circuit can detect whether the vibration exceeds the threshold value, and therefore a worker can distinguish whether the vibration can influence the accuracy of the detection result of the portable instrument;
2. the variable resistor R13 and the resistor R12 are used for voltage division to provide a set threshold value, the threshold value is compared with a received C signal, a high level signal or a low level signal is output, the control module is further enabled to output a judgment result, the circuit can be used for judging directly to output the level signal, and the control module can obtain the judgment result according to the level signal so as to output the judgment result.
Drawings
Fig. 1 is a connection block diagram showing the whole circuit division according to the embodiment of the present application.
Fig. 2 is a circuit schematic diagram showing a power supply circuit according to an embodiment of the present application.
Fig. 3 is a circuit schematic diagram showing a pre-amplifier circuit and a main amplifier circuit according to an embodiment of the present application.
Fig. 4 is a circuit schematic diagram showing a comparison circuit according to an embodiment of the present application.
Description of reference numerals: 1. a pre-amplification circuit; 2. a main amplification circuit; 21. a first amplifying circuit; 22. a second amplifying circuit; 3. a comparison circuit; 4. a power supply circuit; 5. a reference voltage circuit.
Detailed Description
The present application will be described in further detail below with reference to the accompanying fig. 1-4 and examples. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The vibration detection circuit disclosed in this embodiment can be applied to various portable instruments, including but not limited to portable radiation measuring instruments.
The embodiment of the application discloses a vibration detection circuit. Referring to fig. 1, a vibration detection circuit includes a pre-amplifier circuit 1, a main amplifier circuit 2 and a comparator circuit 3, wherein an input terminal of the pre-amplifier circuit 1 is used for connecting an impact vibration sensor, an output terminal of the pre-amplifier circuit 1 is connected to an input terminal of the main amplifier circuit 2, an output terminal of the main amplifier circuit 2 is connected to an input terminal of the comparator circuit 3, and an output terminal of the comparator circuit 3 is connected to a control module.
The comparison circuit 3 is a circuit built by taking a comparator as a core, and a threshold signal of the comparison circuit 3 can be artificially set and changed.
When detecting impact vibration, the impact vibration sensor outputs a signal A, the signal A is transmitted to the preamplification circuit 1 to be amplified and output a signal B, the signal B is input to the main amplification circuit 2 to be amplified and output a signal C, the signal C is input to the comparison circuit 3, the comparison circuit 3 compares the signal C with a threshold signal, and when the signal C is larger than the threshold signal, the comparison circuit 3 outputs the signal C to the control module.
The pre-amplification circuit 1 amplifies the received A signal, so that the B signal reaches the range which can be received by the main amplification circuit 2, then the main amplification circuit 2 amplifies the B signal and outputs a C signal, the C signal is transmitted to the comparison circuit 3 and compared with a threshold signal, when the C signal is larger than or smaller than the threshold value, the comparison circuit 3 outputs a corresponding level signal, and the control module obtains a comparison result according to the level signal, so that a worker can distinguish whether the vibration can affect the portable instrument.
The preamplifier circuit 1 is a charge sensitive preamplifier circuit.
Referring to fig. 2, in the present embodiment, the power supply circuit 4 further includes a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, and a resistor R0, one end of the capacitor C10 is connected to the power supply terminal, the other end of the capacitor C10 is connected to the ground terminal GND _ P, one end of the capacitor C7 is connected to the power supply terminal, the other end of the capacitor C7 is connected to the ground terminal GND _ Q, the capacitor C8 is connected in parallel to the capacitor C7, the capacitor C9 is also connected in parallel to the capacitor C7, one end of the resistor R0 is connected to the ground terminal GND _ P, and the other end of the resistor R0 is connected to the ground terminal GND _ Q.
Wherein, the power supply terminal is used for providing 3V voltage, and the power supply terminal is marked as +3VA in the figure.
Referring to fig. 3, as an alternative implementation manner of this embodiment, the pre-amplifier circuit 1 includes an input terminal S, MOS, a transistor F1 and an operational amplifier U1, a gate of the transistor F1 is connected to a capacitor C1, another end of the capacitor C1 is connected to an input terminal S, the input terminal S is connected to a resistor R1, another end of the resistor R1 is connected to a power supply terminal, a drain of the transistor F1 is connected to a resistor R3, another end of the resistor R3 is connected to the power supply terminal, a drain of the transistor F1 is further connected to a positive input terminal of the operational amplifier U1, a source of the transistor F1 is connected to a resistor R5, another end of the resistor R5 is connected to a negative input terminal of the operational amplifier U1, a negative input terminal of the operational amplifier U1 is further connected to a resistor R4, and another end of the resistor R4 is connected to the power supply terminal. The positive pole of the operational amplifier U1 is connected to the power supply end, and the negative pole of the operational amplifier U1 is connected to the ground end GND _ Q. The output end of the operational amplifier U1 is connected with a capacitor C2, the other end of the capacitor C2 is connected with the capacitor C1, and the resistor R2 is connected in parallel with the capacitor C2.
The source of the MOS transistor F1 is further connected to a reference voltage circuit 5, and the reference voltage circuit 5 is configured to provide a reference voltage value. The reference voltage circuit 5 comprises a reference voltage chip U5, a capacitor C11 and a capacitor C12, an input pin of the reference voltage chip U5 is connected to the power supply terminal, an input pin of the reference voltage chip U5 is connected to the capacitor C11, the other end of the capacitor C11 is connected to a ground terminal GND _ Q, the capacitor C12 is connected in parallel with the capacitor C11, a ground pin of the reference voltage chip U5 is connected to the ground terminal GND _ Q, and an output pin of the reference voltage chip U5 is connected to the source electrode of the MOS transistor F1.
The MOS tube F1 is used for reducing the influence of noise, so that the A signal is more accurate.
The main amplifier circuit 2 includes a first amplifier circuit 21 and a second amplifier circuit 22, a capacitor C3 is connected to an input terminal of the first amplifier circuit 21, and the other terminal of the capacitor C3 is connected to an output terminal of the operational amplifier U1.
Referring to fig. 3, in detail, the first amplifying circuit 21 includes an operational amplifier U2, a resistor R6, a resistor R7 and a capacitor C4, a negative input terminal of the operational amplifier U2 is connected to the resistor R6, the other end of the resistor R6 is connected to an input terminal of the first amplifying circuit 21, the negative input terminal of the operational amplifier U2 is further connected to the resistor R7, the other end of the resistor R7 is connected to an output terminal of the operational amplifier U2, the capacitor C4 is connected in parallel with the resistor R7, and the operational amplifier U2 is further connected to a ground
The positive input end of the operational amplifier U2 is connected to the source of the MOS transistor F1, the output end of the operational amplifier U2 is connected to the output end of the first amplifying circuit 21, the positive electrode of the operational amplifier U2 is connected to the power supply end, and the negative electrode of the operational amplifier U2 is connected to the ground end GND _ Q.
The second amplifying circuit 22 includes an operational amplifier U3, a resistor R8, a resistor R9 and a capacitor C5, the negative input terminal of the operational amplifier U3 is connected to the resistor R8, the other terminal of the resistor R8 is connected to the input terminal of the second amplifying circuit 22, that is, the other terminal of the resistor R8 is connected to the output terminal of the operational amplifier U2, the negative input terminal of the operational amplifier U3 is further connected to the resistor R9, the other terminal of the resistor R9 is connected to the output terminal of the operational amplifier U3, the capacitor C5 is connected in parallel to the resistor R9, the positive input terminal of the operational amplifier U3 is connected to the source of the MOS transistor F1, the negative terminal of the operational amplifier U3 is connected to the ground terminal GND _ Q, the positive terminal of the operational amplifier U3 is connected to the power supply terminal, and the output terminal of the operational amplifier U3 is connected to the output terminal Q of the second amplifying circuit 22.
The reference voltage circuit 5 can provide reference voltage values for the MOS tube F1, the operational amplifier U2 and the operational amplifier U3.
Referring to fig. 4, the input terminal of the comparator circuit 3 is connected to a capacitor C6, and the other terminal of the capacitor C6 is connected to the output terminal Q of the second amplifier circuit 22, that is, the other terminal of the capacitor C6 is connected to the output terminal of the operational amplifier U3.
The comparison circuit 3 comprises a comparator U4, a resistor R10, a resistor R11, a resistor 12, a variable resistor R13, a resistor R14, a resistor R15 and a capacitor C13, wherein the negative input end of the comparator U4 is connected to the resistor R11, the other end of the resistor R11 is connected to the input end of the comparison circuit, the input end of the comparison circuit is further connected to the resistor R10, the other end of the resistor R10 is connected to a ground terminal GND _ Q, the positive input end of the comparator U4 is connected to the variable resistor R13, the other end of the variable resistor R13 is connected to the ground terminal GND _ Q, the capacitor C13 is connected in parallel with the variable resistor R13, the positive input end of the comparator U4 is further connected to the resistor R12, the other end of the resistor R12 is connected to the power supply terminal, pins 4-5 of the comparator U4 are connected to the power supply terminal, pin 4-2 of the comparator U4 is connected to the power supply terminal, pin 4-1 of the comparator U4 is connected to the resistor R15, the other end of the resistor R15 is connected to the output end of the comparison circuit, the output end of the comparison circuit is connected to the control module, and the pin 4 is connected to the ground terminal R14.
The comparator U4 is used to provide a set threshold, then divide the voltage using the resistor R12 and the variable resistor R13 to provide the set threshold, and compare the C signal output by the second amplifying circuit 22 with the threshold. For example, when the C signal is smaller than the threshold, the comparator U4 outputs a low level signal, and when the C signal is larger than the threshold, the comparator U4 outputs a high level signal. The high level signal or the low level signal output by the comparator U4 is transmitted to the control module, and the control module outputs a judgment result according to the high level signal or the low level signal.
The resistor R12 and the variable resistor R13 divide the voltage to provide a set threshold value, and the C signal is compared with the threshold value. The voltage division condition can be changed by changing the resistance value of the variable resistor R13, so that the set threshold value can be adjusted.
The function of each pin of the comparator U4 is described, wherein the pin 4-1 is an output terminal, the pin 4-2 is a ground terminal, the pin 4-3 is a positive input terminal, the pin 4-4 is a negative input terminal, and the pin 4-5 is used for connecting a power supply terminal.
The first amplifier circuit 21 and the second amplifier circuit 22 may adjust the amplification factor according to the resistance value of the resistor and the selection type of the amplifier.
The implementation principle of the vibration detection circuit in the embodiment of the application is as follows: the pre-amplification circuit 1 receives the signal A sent by the impact vibration sensor, then amplifies the signal A and outputs a signal B, the signal B is in a range capable of being received by the first amplification circuit 21, the first amplification circuit 21 and the second amplification circuit 22 perform amplification twice and then output a signal C, the comparator U4 compares the signal C with a threshold value and then outputs a high-level signal or a low-level signal, and the control module outputs a judgment result according to the received level signal. The vibration detection circuit is used for judging whether the vibration exceeding the threshold exists or not, if yes, the control module outputs a corresponding result, and the portable instrument has the possibility that the detection result is inaccurate.
The embodiment of the application also discloses a portable instrument, which comprises the vibration detection circuit disclosed by the embodiment, and the vibration detection circuit is utilized to realize the detection of the vibration, so that the influence of the vibration exceeding a threshold value on the detection of the portable instrument is reduced, and the possibility of inaccurate detection result is reduced.
The foregoing is a preferred embodiment of the present application and is not intended to limit the scope of the application in any way, and any features disclosed in this specification (including the abstract and drawings) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Claims (8)
1. A vibration detection circuit characterized by: the circuit comprises a pre-amplification circuit (1), a main amplification circuit (2) and a comparison circuit (3); the input end of the pre-amplification circuit (1) is used for being connected with an impact vibration sensor, the output end of the pre-amplification circuit (1) is connected with the input end of the main amplification circuit (2), the output end of the main amplification circuit (2) is connected with the input end of the comparison circuit (3), and the output end of the comparison circuit (3) is used for being connected with a control module;
the pre-amplification circuit (1) is used for amplifying the signal A sent by the impact vibration sensor and outputting a signal B, and the signal B is in a range capable of being received by the main amplification circuit (2);
the main amplifying circuit (2) is used for amplifying the B signal again and outputting a C signal;
the comparison circuit (3) compares the C signal with a set threshold value and outputs a high-level signal or a low-level signal to a control module for outputting a judgment result;
the preamplifier circuit (1) comprises an input end S, MOS tube F1 and an operational amplifier U1, the grid of the MOS tube F1 is connected with a capacitor C1, the other end of the capacitor C1 is connected with the input end S, the input end S is connected with a resistor R1, the other end of the resistor R1 is connected with a power supply end, the drain of the MOS tube F1 is connected with a resistor R3, the other end of the resistor R3 is used for connecting the power supply end, the drain of the MOS tube F1 is also connected with the positive input end of the operational amplifier U1, the source of the MOS tube F1 is connected with a resistor R5, the other end of the resistor R5 is connected with the negative input end of the operational amplifier U1, the negative input end of the operational amplifier U1 is further connected with a resistor R4, the other end of the resistor R4 is connected with the power supply end, the positive electrode of the operational amplifier U1 is connected with the power supply end, the negative electrode of the operational amplifier U1 is connected with a grounding end GND _ Q, the output end of the operational amplifier U1 is connected with a capacitor C2, the other end of the capacitor C2 is connected with a reference voltage circuit (MOS tube) connected with a reference voltage circuit).
2. A vibration detection circuit according to claim 1, wherein: the reference voltage circuit (5) comprises a reference voltage chip U5, a capacitor C11 and a capacitor C12, wherein an input pin of the reference voltage chip U5 is used for connecting a power supply end, the input pin of the reference voltage chip U5 is also connected to the capacitor C11, the other end of the capacitor C11 is connected to a ground end GND _ Q, the capacitor C12 is connected with the capacitor C11 in parallel, a ground pin of the reference voltage chip U5 is connected to the ground end GND _ Q, and an output pin of the reference voltage chip U5 is connected to the source electrode of the MOS tube F1.
3. A vibration detection circuit according to claim 1, wherein: the amplifying circuit comprises a first amplifying circuit (21), the first amplifying circuit (21) comprises an operational amplifier U2, a resistor R6, a resistor R7 and a capacitor C4, the negative input end of the operational amplifier U2 is connected to the resistor R6, the other end of the resistor R6 is connected to the input end of the first amplifying circuit (21), the input end of the first amplifying circuit (21) is connected to the input end of the amplifying circuit, the negative input end of the operational amplifier U2 is also connected to the resistor R7, the other end of the resistor R7 is connected to the output end of the operational amplifier U2, the capacitor C4 is connected in parallel with the resistor R7, the positive input end of the operational amplifier U2 is connected to the source of the MOS tube F1, the output end of the operational amplifier U2 is connected to the output end of the first amplifying circuit (21), and the output end of the first amplifying circuit (21) is connected to the output end of the amplifying circuit.
4. A vibration detection circuit according to claim 3, wherein: the amplifying circuit further comprises a second amplifying circuit (22), the second amplifying circuit (22) comprises an operational amplifier U3, a resistor R8, a resistor R9 and a capacitor C5, the negative input end of the operational amplifier U3 is connected to the resistor R8, the other end of the resistor R8 is connected to the input end of the second amplifying circuit (22), the input end of the second amplifying circuit (22) is connected to the output end of the first amplifying circuit (21), the negative input end of the operational amplifier U3 is also connected to the resistor R9, the other end of the resistor R9 is connected to the output end of the operational amplifier U3, the capacitor C5 is connected in parallel with the resistor R9, the negative electrode of the operational amplifier U3 is connected to a ground end GND _ Q, the positive electrode of the operational amplifier U3 is connected to the power supply end, the positive input end of the operational amplifier U3 is connected to the source of the MOS transistor F1, the output end of the operational amplifier U3 is connected to the output end of the second amplifying circuit (22), and the output end of the second amplifying circuit (22) is connected to the output end of the amplifying circuit.
5. A vibration detection circuit according to claim 1 or 3, wherein: the comparison circuit (3) comprises a comparator U4, a resistor R10, a resistor R11, a resistor R12, a variable resistor R13, a resistor R14, a resistor R15 and a capacitor C13, wherein the negative input end of the comparator U4 is connected to the resistor R11, the other end of the resistor R11 is connected to the input end of the comparison circuit (3), the input end of the comparison circuit (3) is further connected to the resistor R10, the other end of the resistor R10 is connected to GND _ Q, the positive input end of the comparator U4 is connected to the variable resistor R13, the other end of the comparator U13 is connected to GND _ Q, the capacitor C13 is connected in parallel with the variable resistor R13, the positive input end of the comparator U4 is further connected to the resistor R12, the other end of the resistor R12 is connected to a power supply end, the pin 5 of the comparator U4 is connected to the power supply end, the pin 2 of the comparator U4 is connected to the grounding end, the pin 1 of the comparator U4 is connected to the resistor R15, the other end of the comparator R15 is connected to the output end of the comparator circuit (3), and the output end of the comparator U4 is connected to the GND _ Q, and the comparator control module 14 is connected to the output end of the comparator U4.
6. A vibration detection circuit according to claim 1, wherein: the power supply circuit (4) is used for being connected with a power supply end, and the pre-amplification circuit (1), the main amplification circuit (2) and the comparison circuit (3) are electrically connected with the power supply circuit (4).
7. The vibration detection circuit according to claim 6, wherein: the power supply circuit (4) further comprises a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10 and a resistor R0, one end of the capacitor C10 is connected to the power supply terminal, the other end of the capacitor C10 is connected to a ground terminal GND, one end of the capacitor C7 is connected to the power supply terminal, the other end of the capacitor C7 is connected to a ground terminal GND _ Q, the capacitor C8 is connected in parallel with the capacitor C7, the capacitor C9 is also connected in parallel with the capacitor C7, one end of the resistor R0 is connected to a ground terminal GND _ P, and the other end of the resistor R0 is connected to a ground terminal GND _ Q.
8. A portable instrument, characterized by: a vibration detection circuit comprising a vibration detection circuit as claimed in any one of claims 1 to 7.
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| CN202210941006.3A CN115014506B (en) | 2022-08-08 | 2022-08-08 | Vibration detection circuit and portable instrument |
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| CN202210941006.3A CN115014506B (en) | 2022-08-08 | 2022-08-08 | Vibration detection circuit and portable instrument |
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