CN214096204U - Detection circuit, metering module and metering device - Google Patents
Detection circuit, metering module and metering device Download PDFInfo
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- CN214096204U CN214096204U CN202022941389.3U CN202022941389U CN214096204U CN 214096204 U CN214096204 U CN 214096204U CN 202022941389 U CN202022941389 U CN 202022941389U CN 214096204 U CN214096204 U CN 214096204U
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Abstract
The utility model provides a detection circuitry, metering module and metering device. The embodiment of the utility model provides a detection circuit, include: a sampling circuit and a processing circuit; the processing circuit is used for inputting an excitation signal to the sampling circuit so that the sampling circuit outputs a target characteristic signal when responding to the action of a metal part under the excitation of the excitation signal, wherein the metal part is arranged on a moving object to be measured; the processing circuit is used for processing the first output signal output by the sampling circuit into a pulse signal, wherein the pulse characteristic of the pulse signal is used for representing the signal distribution of the target characteristic signal in the first output signal, and the pulse characteristic is used for determining the movement times of the moving object to be measured. The utility model provides an electric detection circuitry, metering module and metering device can need not to rely on magnetism sample mode to avoided influencing normal operating owing to receive magnetic interference in the application effectively, can guarantee the stability of circuit work.
Description
Technical Field
The utility model relates to a measurement technical field especially relates to a detection circuitry, metering module and metering device.
Background
With the rapid development of the metering technology, the automatic metering mode is generally adopted in the industries of gas meters and water meters to meter the flow.
The existing mainstream metering technology mainly comprises the following steps: magnetic resistance measurement, Hall measurement, reed switch measurement and the like. The principle of these metering methods is mainly magnetic sampling. In the design application of the magneto-resistance measurement and the Hall measurement, a plurality of magneto-resistance elements or Hall elements are mainly adopted for accurate measurement. Specifically, the reed switch is applied according to the Hall effect in principle, so that the reed switch can be used as an electromagnetic switch and can be switched in the presence of a magnetic field.
However, the application products using the magneto-resistance metering or the hall metering have strict requirements on the structural layout, are easily interfered by magnetic attack in the application process, and in addition, as the service life of the device is gradually increased, the magnetism of the device is weakened or failed, so that the reliability of the metering is reduced.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a detection circuitry, metering module and metering device to replace the scheme of magnetism sample, avoid influencing normal operating owing to receiving magnetic interference in the application.
In a first aspect, an embodiment of the present invention provides a detection circuit, including: a sampling circuit and a processing circuit;
the processing circuit is used for inputting an excitation signal to the sampling circuit so that the sampling circuit outputs a target characteristic signal when responding to the action of a metal part under the excitation of the excitation signal, wherein the metal part is arranged on a moving object to be measured to act;
the processing circuit is further used for processing the first output signal output by the sampling circuit into a pulse signal, wherein the pulse characteristic of the pulse signal is used for representing the signal distribution of the target characteristic signal in the first output signal, and the pulse characteristic is used for determining the movement times of the moving object to be detected.
In one possible design, when the position relation between the sampling circuit and the metal component satisfies a preset condition, the metal component acts on the sampling circuit to enable the sampling circuit to output the target characteristic signal;
the sampling circuit is an oscillating circuit;
when the metal component is not acting on the oscillating circuit, the oscillating circuit outputs a raw signal, and the first output signal comprises the raw signal;
when the metal component acts on the oscillating circuit, the oscillating circuit outputs the target characteristic signal, and the target characteristic signal is an attenuation signal of the original signal.
In one possible design, the processing circuit includes: a filter circuit and a waveform shaping circuit;
the filter circuit is used for filtering the first output signal to output a filtered signal;
the waveform shaping circuit is used for shaping the filtering signal to output the pulse signal.
In one possible design, the processing circuit further includes: a frequency selecting circuit;
the input end of the frequency selection circuit is connected with the output end of the filter circuit, and the frequency selection circuit is used for carrying out frequency selection processing on the filter signal so as to output a target frequency signal;
the output end of the frequency selection circuit is connected with the waveform shaping circuit, and the waveform shaping circuit is used for shaping the target frequency signal so as to output the pulse signal.
In one possible design, the processing circuit further includes: an amplitude adjustment circuit;
the amplitude adjusting circuit is used for adjusting the amplitude of the output signal of the oscillating circuit so as to improve the amplitude.
In one possible design, the processing circuit further includes: an excitation signal adjusting circuit;
the excitation signal adjusting circuit is used for adjusting an input initial excitation signal into the excitation signal with a preset fixed frequency and exciting the oscillation circuit to oscillate by using the excitation signal;
the oscillation circuit includes: the first capacitor and the first inductor are connected in parallel;
the first end of the first capacitor and the first end of the first inductor are respectively connected with the first end of a first resistor, and the second end of the first resistor is connected with a direct-current power supply;
the second end of the first capacitor and the second end of the first inductor are connected with the output end of the excitation signal adjusting circuit, and the input end of the excitation signal adjusting circuit is used for inputting an excitation signal.
In one possible design, the excitation signal adjusting circuit includes a second capacitor, a second resistor, and a third resistor;
the first end of the second capacitor is connected with the base electrode of a first triode, the collector electrode of the first triode is connected with the second end of the first capacitor and the second end of the first inductor, and the emitter electrode of the first triode is grounded;
the first end of the third resistor is connected between the base electrode of the first triode and the first end of the second capacitor, and the second end of the third resistor is grounded;
and the second end of the second capacitor is connected with the first end of the second resistor, and the second end of the second resistor is used for inputting the excitation signal.
In one possible design, the frequency selection circuit includes: a fourth capacitor and a fifth resistor;
the first end of the fourth capacitor and the first end of the fifth resistor are respectively connected with the collector of the second triode, and the collector of the second triode is connected with the input end of the waveform shaping circuit;
and the second end of the fourth capacitor and the second end of the fifth resistor are respectively grounded.
In one possible design, the amplitude adjustment circuit includes: a fifth capacitor and a sixth capacitor;
the first end of the fifth capacitor and the first end of the sixth capacitor are respectively connected with the first end of the first resistor, and the second end of the fifth capacitor and the second end of the sixth capacitor are respectively grounded.
In a second aspect, the embodiment of the present invention further provides a metering module, including: a processor and at least one detection circuit as any one of the provided in the first aspect;
the detection circuit outputs the pulse signal to the processor, so that the processor can be used for determining the movement times of the moving object to be detected according to the pulse characteristics.
In a third aspect, the embodiment of the present invention further provides a metering device, including: a moving object to be measured and a metrology module as provided in any one of the second aspects;
the moving object to be detected is provided with a metal part, and when the moving object to be detected moves to a target position, the metal part acts on the sampling circuit;
the processor is further used for determining a metering result according to the movement times and a preset metering rule;
(ii) a The moving object to be detected is a rotating piece;
the metal part is arranged on the rotating piece, and the rotating piece is arranged above the sampling circuit;
when the metal part rotates to the target position along with the rotating piece, the metal part acts on the sampling circuit.
The embodiment of the utility model provides a pair of detection circuitry, metering module and metering device, when the last metal part of the motion object that awaits measuring acted on sampling circuit, sampling circuit exported corresponding target characteristic signal under excitation signal's excitation to make processing circuit embody this target characteristic signal's distribution characteristic in the pulse signal after handling, thereby make external processor can confirm the motion number of times of the motion object that awaits measuring according to the pulse signal after this processing. Therefore, in the embodiment, the motion characteristic of the moving object to be detected is detected by using the principle that the metal component influences the sampling circuit to change the output signal, the dependence on a magnetic sampling mode is not needed, and the influence on the normal operation caused by magnetic interference in the application process is effectively avoided. In addition, because electronic devices in the sampling circuit are not easy to fail or have performance degradation, the working stability of the circuit can be ensured. Moreover, due to the adoption of the simple circuit structure, the power consumption of the magnetic induction element is relatively lower in the application process compared with that of a magnetic induction element, so that the power consumption of an applied product can be effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic diagram of a detection circuit according to an exemplary embodiment of the present invention;
fig. 2 is a schematic diagram of a detection circuit according to another exemplary embodiment of the present invention;
FIG. 3 is a schematic diagram of a metrology module shown in accordance with an exemplary embodiment of the present invention;
fig. 4 is a schematic diagram of a meter according to an exemplary embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic diagram of a detection circuit according to an exemplary embodiment of the present invention. As shown in fig. 1, the detection circuit 100 provided in this embodiment includes: a sampling circuit 101 and a processing circuit.
The processing circuit is used for inputting the excitation signal to the sampling circuit 101, so that the sampling circuit 101 outputs the original signal in a stable form under the excitation of the excitation signal. When the sampling circuit 101 is acted by a metal part, the output target characteristic signal, that is, the signal output by the sampling circuit 101 is changed compared with the original signal, wherein the metal part is arranged on the moving object to be measured. It should be noted that the metal part may be disposed on the measuring instrument to which the detection circuit 100 is applied, for example, the metal part may be disposed on a rotating member of the measuring instrument, and specifically, may be disposed on a turntable of the rotating member. When the metal part rotates along with the rotating member, the relative position relationship between the metal part and the sampling circuit 101 changes along with the rotation. If the metal component rotates to the target position along with the rotating member, so that the relative position relationship between the metal component and the sampling circuit 101 satisfies a predetermined condition (for example, the metal component rotates to above the sampling circuit 101), at this time, the metal component acts on the sampling circuit 101, so that the sampling circuit 101 outputs the target characteristic signal.
The sampling circuit 101 outputs a first output signal when operating, and outputs the first output signal to the processing circuit for processing. Specifically, the processing circuit is configured to process the first output signal output by the sampling circuit 101 into a pulse signal, where a pulse feature of the pulse signal is used to characterize signal distribution of the target feature signal in the first output signal, and the pulse feature is used to determine the number of times of movement of the moving object to be measured.
Specifically, the sampling circuit 101 outputs a stable original signal when not being affected by the metal component, and after the sampling circuit 101 is affected by the metal component, the specific signal is affected and changed, specifically, the signal characteristic is changed, and a target characteristic signal with identification is generated. The first output signal output by the sampling circuit 101 includes an original signal and a target characteristic signal, and the original signal and the target characteristic signal have a certain regular signal distribution. The processing circuit can process according to the signal distribution characteristics in the first output signal and the signal characteristics of various signals to output pulse signals, and the pulse signals can be output to the processor to be digitally processed to determine the number of movements of the moving object to be measured (for example, the number of rotations of the turntable), and further determine a metering result according to the determined number of movements and a preset metering rule (for example, determine a total flow according to the number of rotations of the turntable and a flow corresponding to one rotation).
In this embodiment, when the metal component on the moving object to be measured acts on the sampling circuit, the sampling circuit outputs a corresponding target characteristic signal under the excitation of the excitation signal, so that the processing circuit reflects the distribution characteristic of the target characteristic signal in the processed pulse signal, and the external processor can determine the number of times of movement of the moving object to be measured according to the processed pulse signal. Therefore, in the embodiment, the motion characteristic of the moving object to be detected is detected by using the principle that the metal component influences the sampling circuit to change the output signal, the dependence on a magnetic sampling mode is not needed, and the influence on the normal operation caused by magnetic interference in the application process is effectively avoided. In addition, because electronic devices in the sampling circuit are not easy to fail or have performance degradation, the working stability of the circuit can be ensured. Moreover, due to the adoption of the simple circuit structure, the power consumption of the magnetic induction element is relatively lower in the application process compared with that of a magnetic induction element, so that the power consumption of an applied product can be effectively reduced.
On the basis of the above embodiment, the sampling circuit may be an oscillation circuit that outputs an original signal when the metal component does not act on the oscillation circuit, and outputs a target characteristic signal that is an attenuated signal of the original signal when the metal component acts on the oscillation circuit, wherein the original signal and the target characteristic signal are included in the first output signal output by the oscillation circuit. Optionally, when the metal component does not act on the oscillation circuit, the signal output by the oscillation circuit is a sinusoidal signal, and when the metal component acts on the oscillation circuit, the signal output by the oscillation circuit is an attenuated sinusoidal signal.
In order to perform corresponding processing on the first output signal output by the oscillation circuit, the processing circuit includes: a filter circuit 102 and a waveform shaping circuit 103. Specifically, the filter circuit 102 is configured to perform a filtering process on the first output signal to output a filtered signal, and the waveform shaping circuit 103 is configured to perform a shaping process on the filtered signal to output a pulse signal.
Furthermore, the processing circuit may further include: a frequency selection circuit 104. Specifically, an input end of the frequency selecting circuit 104 is connected to an output end of the filter circuit 102, and the frequency selecting circuit 104 is configured to perform frequency selecting processing on the filter signal to output a target frequency signal. The output end of the frequency selecting circuit 104 is connected to the waveform shaping circuit 103, and the waveform shaping circuit 103 shapes the target frequency signal to output a pulse signal.
Optionally, the processing circuit may further include: an amplitude adjusting circuit 106 for adjusting the amplitude of the output signal of the oscillating circuit by using the amplitude adjusting circuit 106 to increase the amplitude. In addition, since the amplitude of the first output signal output by the sampling circuit 101 is fixed and there is attenuation after the output, if the original amplitude of the output first output signal is too small or the amplitude of the first output signal after the attenuation is too small, the subsequent processing and detection are not facilitated. Therefore, in this embodiment, the amplitude of the first output signal output by the sampling circuit 101 is increased by setting the amplitude adjusting circuit 106, so that not only the adverse effect caused by signal transmission attenuation can be overcome, but also the anti-interference capability in the transmission process of the first output signal can be enhanced. In addition, the amplitude of the first output signal is increased by the amplitude adjusting circuit 106, so that the first output signal input to the subsequent circuits (the filter circuit 102 and the frequency selecting circuit 104) has a higher amplitude, which is beneficial to fidelity of the first output signal in the filtering and frequency selecting process, and further improves the subsequent metering accuracy.
In order to oscillate the oscillation circuit, the processing circuit may further include: and an excitation signal adjusting circuit 105, wherein an input end of the excitation signal adjusting circuit 105 may be connected to the processor, so as to obtain an initial excitation signal output by the processor, and then, the input initial excitation signal is adjusted to an excitation signal with a preset fixed frequency by the excitation signal adjusting circuit 105, and the excitation signal is output through an output end for inputting the excitation signal to the oscillation circuit. It should be noted that the initial excitation signal outputted by the processor usually has a frequency unstable characteristic, and the excitation signal adjusting circuit is provided in this embodiment to: after passing through the excitation signal adjusting circuit, the unstable-frequency initial excitation signal (i.e., the initial excitation signal of any frequency) is converted into an excitation signal with a preset fixed frequency, so that the excitation signal with the preset fixed frequency is reused to excite the oscillation circuit.
On the basis of the above embodiment, fig. 2 is a schematic structural diagram of a detection circuit according to another exemplary embodiment of the present invention. As shown in fig. 2, the sampling circuit 101 may include: the first capacitor C1 is connected in parallel with the first inductor L1. Specifically, a first end of the first capacitor C1 and a first end of the first inductor L1 are respectively connected to a first end of the first resistor R1, and a second end of the first resistor R1 is connected to the dc power supply. The second terminal of the first capacitor C1 and the second terminal of the first inductor L1 are connected to the output terminal of the excitation signal adjusting circuit, and the input terminal of the excitation signal adjusting circuit is used for inputting the excitation signal.
The excitation signal adjusting circuit 105 may be a high-pass filter circuit, and may select a certain frequency for excitation, and the excitation signal may be input by a processor (e.g., a single chip microcomputer). Specifically, the excitation signal adjusting circuit 105 may include a second capacitor C2, a second resistor R2, and a third resistor R3. The first end of the second capacitor C2 is connected to the base of the first transistor Q1, the collector of the first transistor Q1 is connected to the second end of the first capacitor C1 and the second end of the first inductor L1, and the emitter of the first transistor Q1 is grounded. The first end of the third resistor R3 is connected between the base of the first transistor Q1 and the first end of the second capacitor C2, and the second end of the third resistor R3 is grounded. The second end of the second capacitor C2 is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is used for inputting the excitation signal.
Further, for the filter circuit 102, it may include: a third capacitor C3 and a fourth resistor R4. Specifically, a first end of the third capacitor C3 and a first end of the fourth resistor R4 are connected to a collector of the first transistor Q1, respectively. The second end of the third capacitor C3 and the second end of the fourth resistor R4 are respectively connected to the base of the second triode Q2, the emitter of the second triode Q2 is respectively connected to the first end of the first capacitor C1 and the first end of the first inductor L1, and the collector of the second triode Q2 is connected to the input of the frequency-selective circuit.
Optionally, the frequency selecting circuit 104 may include: a fourth capacitor C4 and a fifth resistor R5. Specifically, a first end of the fourth capacitor C4 and a first end of the fifth resistor R5 are connected to a collector of the second transistor Q2, respectively, and a collector of the second transistor Q2 is connected to an input terminal of the waveform shaping circuit 103. The second terminal of the fourth capacitor C4 and the second terminal of the fifth resistor R5 are respectively grounded.
In one possible design, the waveform shaping circuit 103 for the above may be a flip-flop chip. Specifically, the input end 1A of the flip-flop chip is connected to the collector of the second transistor Q2, and the output end 1Y of the flip-flop chip is used for outputting a pulse signal.
In another possible design, the waveform shaping circuit 103 may also be a schmitt trigger built by discrete electronic elements, and the implementation cost may be further reduced compared to directly using a trigger chip by building a trigger by common discrete electronic elements.
In addition, for the amplitude adjustment circuit 106, mainly the amplitude of the oscillation circuit is adjusted, which may be implemented in the form of a parallel capacitor, and the amplitude of the oscillation circuit may be increased or decreased by changing the size of the capacitor. The number of attenuation pulses can be determined according to a set threshold value in a certain oscillation period. Specifically, the amplitude adjustment circuit 106 may include: a fifth capacitor C5 and a sixth capacitor C6, wherein a first terminal of the fifth capacitor C5 and a first terminal of the sixth capacitor C6 are respectively connected to a first terminal of the first resistor R1, and a second terminal of the fifth capacitor C5 and a second terminal of the sixth capacitor C6 are respectively connected to ground.
Fig. 3 is a schematic diagram of a metrology module shown in accordance with an exemplary embodiment of the present invention. As shown in fig. 3, the metering module 300 provided in this embodiment may include a processor 320 and at least one detection circuit (for example, may include a detection circuit a311 and a detection circuit B312), where the detection circuit outputs a pulse signal to the processor, so that the processor determines the number of movements of the moving object to be measured according to the pulse characteristics. Specifically, the processor 320 and the detection circuit may be disposed on a circuit board to form an integral module, and when the integral module is applied, the integral module may be integrally installed in a corresponding product to implement a corresponding function. In addition, for the implementation of the detection circuit in this embodiment, reference may be made to the description of the detection circuit in the foregoing embodiment, and details are not repeated here.
Fig. 4 is a schematic diagram of a meter according to an exemplary embodiment of the present invention. As shown in fig. 4, the metering device provided in this embodiment may include a circuit board 110, and a metering module disposed on the circuit board 110. In addition, a moving object to be measured is disposed in the measuring instrument, and a metal part is disposed on the moving object to be measured, and when the moving object to be measured moves to a target position, the metal part acts on the sampling circuit 101 disposed on the circuit board 110.
Optionally, the moving object to be measured may be a rotating member 200, a turntable 201 is disposed on the rotating member 200, and a metal part 202 is disposed on the turntable 201. When the rotating member 200 is in operation, the rotating disc 201 on the rotating member 200 rotates along with the rotating member 200, when the metal part 202 on the rotating disc 201 moves to above the oscillating circuit, the output signal of the oscillating circuit is attenuated by the metal sheet above, and when the metal sheet on the rotating member rotates through the oscillating circuit, the oscillating circuit continues to oscillate. Then, the waveform output by the oscillation circuit during the operation is adjusted and input into the processor, thereby realizing the metering function.
In this embodiment, when the metal sheet on the rotating member rotates past the oscillating circuit, the oscillating circuit oscillates normally, and when the metal part on the rotating disk moves above the oscillating circuit, the output signal of the oscillating circuit can cause signal attenuation due to the metal sheet above, and then the waveform output by the oscillating circuit during the operation is adjusted and input into the processor to realize the metering function, so that the influence on the normal operation due to magnetic interference in the application process is effectively avoided without depending on a magnetic sampling mode. In addition, because electronic devices in the sampling circuit are not easy to fail or have performance degradation, the working stability of the circuit can be ensured. Moreover, due to the adoption of the simple circuit structure, the power consumption of the magnetic induction element is relatively lower in the application process compared with that of a magnetic induction element, so that the power consumption of an applied product can be effectively reduced.
In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", etc., used to indicate the orientation or positional relationship may be based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the indicated position or original must have a particular orientation, be of particular construction and operation, and thus should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; either directly or indirectly through intervening media, such as through internal communication or through an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact with each other through another feature therebetween. Further, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (11)
1. A detection circuit, comprising: a sampling circuit and a processing circuit;
the processing circuit is used for inputting an excitation signal to the sampling circuit so that the sampling circuit outputs a target characteristic signal when responding to the action of a metal part under the excitation of the excitation signal, wherein the metal part is arranged on a moving object to be measured;
the processing circuit is further used for processing the first output signal output by the sampling circuit into a pulse signal, wherein the pulse characteristic of the pulse signal is used for representing the signal distribution of the target characteristic signal in the first output signal, and the pulse characteristic is used for determining the movement times of the moving object to be detected.
2. The detection circuit according to claim 1, wherein when the positional relationship between the sampling circuit and the metal member satisfies a preset condition, the metal member acts on the sampling circuit to cause the sampling circuit to output the target characteristic signal;
the sampling circuit is an oscillating circuit;
when the metal component is not acting on the oscillating circuit, the oscillating circuit outputs a raw signal, and the first output signal comprises the raw signal;
when the metal component acts on the oscillating circuit, the oscillating circuit outputs the target characteristic signal, and the target characteristic signal is an attenuation signal of the original signal.
3. The detection circuit of claim 2, wherein the processing circuit comprises: a filter circuit and a waveform shaping circuit;
the filter circuit is used for filtering the first output signal to output a filtered signal;
the waveform shaping circuit is used for shaping the filtering signal to output the pulse signal.
4. The detection circuit of claim 3, wherein the processing circuit further comprises: a frequency selecting circuit;
the input end of the frequency selection circuit is connected with the output end of the filter circuit, and the frequency selection circuit is used for carrying out frequency selection processing on the filter signal so as to output a target frequency signal;
the output end of the frequency selection circuit is connected with the waveform shaping circuit, and the waveform shaping circuit is used for shaping the target frequency signal so as to output the pulse signal.
5. The detection circuit of claim 4, wherein the processing circuit further comprises: an amplitude adjustment circuit;
the amplitude adjusting circuit is used for adjusting the amplitude of the output signal of the oscillating circuit so as to improve the amplitude.
6. The detection circuit of claim 5, wherein the processing circuit further comprises: an excitation signal adjusting circuit;
the excitation signal adjusting circuit is used for adjusting an input initial excitation signal into the excitation signal with a preset fixed frequency and exciting the oscillation circuit to oscillate by using the excitation signal;
the oscillation circuit includes: the first capacitor and the first inductor are connected in parallel;
the first end of the first capacitor and the first end of the first inductor are respectively connected with the first end of a first resistor, and the second end of the first resistor is connected with a direct-current power supply;
the second end of the first capacitor and the second end of the first inductor are connected with the output end of the excitation signal adjusting circuit, and the input end of the excitation signal adjusting circuit is used for inputting an excitation signal.
7. The detection circuit of claim 6, wherein the excitation signal adjustment circuit comprises a second capacitor, a second resistor, and a third resistor;
the first end of the second capacitor is connected with the base electrode of a first triode, the collector electrode of the first triode is connected with the second end of the first capacitor and the second end of the first inductor, and the emitter electrode of the first triode is grounded;
the first end of the third resistor is connected between the base electrode of the first triode and the first end of the second capacitor, and the second end of the third resistor is grounded;
and the second end of the second capacitor is connected with the first end of the second resistor, and the second end of the second resistor is used for inputting the excitation signal.
8. The detection circuit of claim 7, wherein the frequency selection circuit comprises: a fourth capacitor and a fifth resistor;
the first end of the fourth capacitor and the first end of the fifth resistor are respectively connected with the collector of a second triode, and the collector of the second triode is connected with the input end of the waveform shaping circuit;
and the second end of the fourth capacitor and the second end of the fifth resistor are respectively grounded.
9. The detection circuit according to any one of claims 6 to 8, wherein the amplitude adjustment circuit comprises: a fifth capacitor and a sixth capacitor;
the first end of the fifth capacitor and the first end of the sixth capacitor are respectively connected with the first end of the first resistor, and the second end of the fifth capacitor and the second end of the sixth capacitor are respectively grounded.
10. A metering module, comprising: a processor and at least one detection circuit as claimed in any one of claims 1 to 9;
the detection circuit outputs the pulse signal to the processor, so that the processor can be used for determining the movement times of the moving object to be detected according to the pulse characteristics.
11. A metering device, comprising: a moving object to be measured and the metrology module of claim 10;
the moving object to be detected is provided with a metal part, and when the moving object to be detected moves to a target position, the metal part acts on the sampling circuit;
the processor is further used for determining a metering result according to the movement times and a preset metering rule;
the moving object to be detected is a rotating piece;
the metal part is arranged on the rotating piece, and the rotating piece is arranged above the sampling circuit;
when the metal part rotates to the target position along with the rotating piece, the metal part acts on the sampling circuit.
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| CN202022941389.3U CN214096204U (en) | 2020-12-10 | 2020-12-10 | Detection circuit, metering module and metering device |
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| CN202022941389.3U CN214096204U (en) | 2020-12-10 | 2020-12-10 | Detection circuit, metering module and metering device |
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