CN217980655U - Synchronous measuring device - Google Patents

Abstract

The application provides a synchronous measuring device, the device includes: the device comprises a control module, at least one force value sampling module and at least one output sampling module which are arranged in pairs; the control module is respectively and independently connected with the force value sampling module and the output sampling module; the force value sampling module is used for collecting a force value signal applied to the measured sensor; the output sampling module is used for collecting the output signal of the sensor to be tested; the control module is used for synchronously measuring the force value signal and the output signal and processing the force value signal and the output signal. The control module is independently connected with the force value sampling module and the output sampling module respectively, so that double-channel synchronous measurement can be realized; the control module is independently connected with the force value sampling modules and the output sampling modules respectively, multi-channel synchronous measurement can be achieved, the synchronism of two-path or multi-path signal sampling is improved, the calibration efficiency is improved, the reliability is high, and the service life is long.

Description

Synchronous measuring device

Technical Field

The application relates to the technical field of force value verification and calibration, in particular to a synchronous measuring device.

Background

With the development of economy, society needs more and more different kinds of pressure sensors, and the output signal of the pressure sensor can be one of mV/V signal, resistance signal, voltage signal and current signal. The pressure sensor manufacturing plant needs to measure and calibrate the sensors with different signals. There are two conventional testing methods available: 1. the force value and the output signal of the sensor to be measured are measured by different instruments; 2. the force value and the output signal of the sensor to be measured are measured by the same instrument.

For the first test method, due to the sampling speeds used by different instruments, different filtering methods can cause the force value and the output signal of the pressure-measured sensor to be asynchronous, so that the measurement precision and the repeatability of the measurement result are reduced; for the second test method, the existing circuit structure is complex, expensive and cannot provide customizable I/O output signals.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide a synchronous measuring device, through setting up control module, and set up at least one power value sampling module and at least one output sampling module in pairs, control module is independent connection power value sampling module and output sampling module respectively, can realize synchronous measurement, the signal that processing power value sampling module and output sampling module produced, and then can finally obtain the relation of current power value and measured sensor output signal, thereby the above-mentioned technical problem of "reduce repeatability of measurement accuracy and measuring result, circuit structure is complicated" has been solved.

The embodiment of the application provides a synchronous measuring device, and the device includes: the device comprises a control module, at least one force value sampling module and at least one output sampling module which are arranged in pairs; the control module is respectively and independently connected with the force value sampling module and the output sampling module; the force value sampling module is used for collecting a force value signal applied to the measured sensor; the output sampling module is used for collecting an output signal of the sensor to be detected; the control module is used for synchronously measuring the force value signal and the output signal and processing the force value signal and the output signal.

In the implementation process, the control module is independently connected with the force value sampling module and the output sampling module respectively, so that double-channel synchronous measurement can be realized; the control module is independently connected with the force value sampling modules and the output sampling modules respectively, so that multi-channel synchronous measurement can be realized. The setting mode enables the whole sampling speed of the device to be higher, two or more paths of independent acquisition can adopt the same clock signal of the control module, the synchronism of two or more paths of signal sampling is improved, the calibration precision and the calibration efficiency are improved, the reliability is high, and the service life is long.

Optionally, the force value sampling module and the output sampling module each include: an ADC sampling circuit.

In the implementation process, the independent ADC sampling circuits are arranged in the force value sampling module and the output sampling module, so that the analog voltage signal output by the tested sensor can be amplified, filtered and converted into a digital signal which is easier to store, process and transmit by the control module, the overall sampling speed of the system is improved, and the sampling high precision, low power consumption and high conversion efficiency are embodied.

Optionally, the ADC sampling circuit includes an input filter circuit, a differential amplification circuit, and an output filter circuit; the input filter circuit is electrically connected with the differential amplification circuit, and the differential amplification circuit is electrically connected with the output filter circuit.

In the implementation process, the ADC sampling circuit consists of an input filter circuit, a differential amplification circuit and an output filter circuit, so that the sampled data can be filtered, amplified, analyzed and transmitted and distributed respectively, and the sampling precision and the conversion efficiency are improved.

Optionally, the output signal comprises one of a mV/V signal, a resistance signal, a voltage signal, and a current signal.

In the implementation process, the device is easy to use and practical by synchronously measuring different types of sensors to be measured and processing different output signals.

Optionally, the control module comprises a single chip microcomputer control system, a communication circuit and an upper computer; the single chip microcomputer control system is connected with an upper computer through a communication circuit; the singlechip control circuit is used for synchronously receiving the force value signal and the output signal, digitally filtering the force value signal and the output signal and packaging the force value signal and the output signal into a data frame; the communication circuit is used for sending the data frame to an upper computer; and the upper computer is used for generating a functional relation between the output signal value and the corresponding force value according to the data frame.

In the implementation process, the control module consisting of the single chip microcomputer control system, the communication circuit and the upper computer can orderly realize the automatic acquisition, reading, processing and display of the electric signals of the force value sensor by the hardware structure system, has the advantages of high intelligent degree and simple and easy operation, reduces the volume of the device, improves the speed of data transmission and improves the measurement precision.

Optionally, the control module further comprises an I/O interface; and the I/O interface is used for outputting a corresponding peripheral control signal according to the function relation.

In the implementation process, the I/O interface circuit can provide customizable I/O output signals to drive peripheral devices to control target functions, so that the usability and the practicability of the device are improved.

Optionally, the measured sensor applies alternating voltage excitation through an alternating current excitation circuit to generate a force value signal and an output signal; the alternating current excitation circuit is used for providing forward excitation voltage and reverse excitation voltage for generating a force value signal and an output signal.

In the implementation process, the force value sensor generating the force value signal and the measured sensor generating the output signal are subjected to alternating current excitation, so that the thermocouple effect in a line can be removed, and better EMC anti-interference performance can be provided, thereby improving the measurement precision of the device.

Optionally, the ac excitation circuit comprises: an inverter circuit, a MOS transistor circuit; the inverter circuit is connected with the MOS tube circuit in series; the MOS tube circuit is used for providing different conducting circuits according to external input voltage; the inverter circuit is used for outputting corresponding forward excitation voltage or reverse excitation voltage according to the different conducting circuits.

In the implementation process, the force value sensor is subjected to alternating current excitation provided by the phase inverter and the MOS tube together, so that the thermocouple effect in a line can be removed, and simultaneously, better EMC (electromagnetic compatibility) anti-interference performance can be provided, and the measurement precision of the device is improved.

Optionally, the ac excitation circuit further comprises: an anti-jamming circuit; the anti-interference circuit is connected with the MOS tube circuit in parallel; the anti-jamming circuit is used for adjusting high output voltage so as to protect the alternating current excitation circuit.

In the implementation process, when the external voltage is too high, the device can play a role in protection, can also filter various clutter, harmonic waves and interference signals, prevents high-frequency interference formed by the conducting circuit of the MOS tube, and improves the anti-interference performance, thereby improving the measurement precision of the device.

Optionally, the ac excitation circuit further comprises: a filter circuit; the filter circuit is connected with the MOS tube circuit in series; the filter circuit is used for filtering noise waves generated by the alternating current excitation circuit power supply.

In the implementation process, ripples in the rectified output voltage of the power supply end of the U2 can be filtered out by adding the filter circuit, and the smoothness of the output waveform is improved.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in more detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a schematic block diagram of a synchronous measurement device according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of an ADC sampling circuit according to an embodiment of the present disclosure;

fig. 3 is a system block diagram of a synchronous measurement device according to an embodiment of the present application;

FIG. 4 is a force-output relationship curve provided in an embodiment of the present application;

fig. 5 is a schematic structural diagram of an ac excitation circuit according to an embodiment of the present application;

fig. 6 is a schematic diagram of forward driving and reverse driving voltages provided by an embodiment of the present application.

Icon: 01-synchronous measuring device; 10-a control module; 20-a force value sampling module; 21-ac excitation circuit; 211-an inverter circuit; 212-MOS transistor circuit; 213-an anti-jamming circuit; 214-a filter circuit; 30-an output sampling module; 40-ADC sampling circuit; 41-an input filter circuit; 42-differential amplification circuit; 43-output filter circuit.

Detailed Description

The technical solution in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used for distinguishing the description only, and are not to be construed as indicating or implying any such actual relationship or order between such entities or operations. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one of 8230, and" comprising 8230does not exclude the presence of additional like elements in a process, method, article, or apparatus comprising the element.

In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", and the like refer to the orientation or positional relationship based on the drawings, or the orientation or positional relationship that the utility model product usually visits when in use, and are only for convenience of describing and simplifying the present application, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

Throughout the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect through an intermediate medium, and may be a communication between the two elements. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.

Referring to fig. 1, fig. 1 is a schematic block diagram of a first synchronous measurement device 01 according to an embodiment of the present disclosure. The synchronous measuring device 01 includes: a control module 10, and at least one force value sampling module 20 and at least one output sampling module 30 arranged in pairs.

The control module 10 is respectively and independently connected with the force value sampling module 20 and the output sampling module 30; the force value sampling module 20 is used for collecting a force value signal applied to the measured sensor; the output sampling module 30 is used for collecting the output signal of the sensor to be tested; the control module 10 is used for synchronously measuring the force value signal and the output signal and processing the force value signal and the output signal.

Illustratively, the control module 10 may be a microcontroller such as a high-precision and high-performance single chip microcomputer, and may integrate various integrated circuits such as a storage circuit, a data processing circuit, an IO output circuit, an RS232/RS485/CAN communication interface circuit, for example: STM8S103F3P3 type singlechip, STM8L151G4U6 type singlechip. The control module 10 can also be provided with a zero calibration key and a full-scale calibration key, so that an automatic calibration program for calibrating the zero position and full-load output signals of the pressure sensor can be loaded in the single chip microcomputer, and the control module 10 can also transmit the received data to an upper computer for further processing through a communication circuit.

The measured sensor may be a conventional pressure sensor or a force sensor. The force value sampling module 20 may include a force value sensor disposed on the machine to be tested, so as to collect a pull pressure value signal of the machine to be tested, which is sensed by the force value sensor when a force value generated by a hydraulic device, a motor or other devices is applied to the force value sensor, where the pull pressure value signal may be a mV/V signal converted from a current applied force value, and is used as a force value signal; the output sampling module 30 may also include: the force value sensor is arranged on the tested machine-checking device to collect the pull pressure value signal sensed by the force value sensor, and the pull pressure value signal can be one of mV/V signal, resistance signal, voltage signal and current signal and is used as an output signal.

The control module 10 can have a dual-channel input port, and is independently connected with a force value sampling module 20 and an output sampling module 30 respectively to realize dual-channel synchronous measurement; the control module 10 may also have a multi-channel input port, which is independently connected to the plurality of force value sampling modules 20 and the plurality of output sampling modules 30, respectively, to implement multi-channel synchronous measurement. Due to the circuit structure, the control module 10 can synchronously receive two signals collected and transmitted by the force value sampling module 20 and the output sampling module 30, namely: and the force value signal and the output signal are subjected to identification and operation processing, and the force value signal and the output signal of the tested machine-testing machine with stable force and the same time sequence are synchronously measured and processed.

Wherein, the idea of synchronous measurement is equivalent to a comparative test: in the comparison type test, a force value is applied to a tested sensor by a hydraulic device, a motor or other devices, then the current force value is converted into a mV/V signal by a high-precision pressure sensor, and finally the current force value is measured by a high-precision instrument by collecting the mV/V signal. Meanwhile, the output signal of the sensor to be measured needs to be synchronously measured, so that the relation between the current force value and the output signal of the sensor to be measured can be obtained.

The control module 10 is independently connected with a force value sampling module 20 and an output sampling module 30 respectively, so that double-channel synchronous measurement can be realized; the control module 10 is independently connected with the force value sampling modules 20 and the output sampling modules 30 respectively, so that multi-channel synchronous measurement can be realized. This kind of mode of setting up for the whole sampling speed of device is faster, and two or multichannel independent collection can adopt the same clock signal of control module 10, has improved the synchronism of two way or multichannel signal sampling, has avoided adopting different instrument and host computer communication, makes current force value and the condition that the sensor output signal is surveyed not in same data frame when transmitting to the host computer, and stability, synchronism are relatively poor, have improved calibration accuracy, calibration efficiency, and the reliability is high, long service life.

In one embodiment, the force value sampling module 20 and the output sampling module 30 each include: an ADC sampling circuit 40.

For example, the force value sampling module 20 and the output sampling module 30 may both use the ADC sampling circuit 40 to perform analog-to-digital conversion, and may amplify, filter and convert the analog voltage signal output by the pressure sensor into a digital signal that is easier to be stored, processed and transmitted by the control module 10. Alternatively, the ADC sampling circuit 40 may be an analog-to-digital converter chip of type LTC2240, and is specifically composed of a sampling control integrated circuit U7 of type LTC 2240.

The force value sampling module 20 can comprise a force value sensor arranged on a tested machine and an ADC sampling circuit 40, wherein an input pin of the ADC sampling circuit 40 is connected with an output end of the force value sensor. The force value sampling module 20 can collect the pull pressure value analog signal of the tested machine tester sensed by the force value sensor when the hydraulic device, the motor or other devices generate a force value to be applied on the force value sensor, and the pull pressure value analog signal can be a mV/V signal converted from the currently applied force value and is converted into a digital force value signal through analog-to-digital conversion such as sampling, holding, quantizing and encoding by the ADC sampling circuit 40.

Similarly, the output sampling module 30 may also include a force value sensor disposed on the machine under test, and the ADC sampling circuit 40, an input pin of the ADC sampling circuit 40 being connected to the force value sensor output. The force value sampling module 20 can collect the analog signal of the pulling pressure value of the tested machine tester sensed by the force value sensor, the analog signal of the pulling pressure value can be one of mV/V signal, resistance signal, voltage signal and current signal, and the analog-to-digital conversion such as sampling, holding, quantifying and encoding by the ADC sampling circuit 40 forms the output signal in digital form.

By arranging the independent ADC sampling circuits 40 in the force value sampling module 20 and the output sampling module 30, the analog voltage signal output by the sensor to be tested can be amplified, filtered and converted into a digital signal which can be stored, processed and transmitted by the control module 10 more easily, so that the overall sampling speed of the system is increased, and the high precision, low power consumption and high conversion efficiency of sampling are reflected.

In an embodiment, please refer to fig. 2, fig. 2 is a schematic structural diagram of an ADC sampling circuit 40 according to an embodiment of the present disclosure. The ADC sampling circuit 40 includes an input filter circuit 41, a differential amplification circuit 42, and an output filter circuit 43; the input filter circuit 41 is electrically connected to the differential amplifier circuit 42, and the differential amplifier circuit 42 is electrically connected to the output filter circuit 43.

Illustratively, the ADC sampling circuit 40 is composed of an input filter circuit 41, a differential amplifier circuit 42, and an output filter circuit 43. The input filter circuit 41 and the output filter circuit 43 are respectively composed of two first-order RC low-pass filters, and the differential amplifier circuit 42 is composed of two low-noise operational amplifiers with the type LTC 2057; the signal input ends of the differential amplifying circuit 42 are correspondingly connected with the signal output ends of the two input first-order RC low-pass filters of the input filter circuit 41, and the signal output ends of the differential amplifying circuit 42 are correspondingly connected with the signal input ends of the two output first-order RC low-pass filters of the output filter circuit 43; the signal input ends of the two input first-order RC low-pass filters of the input filter circuit 41 are correspondingly and electrically connected with the sensor to be tested; the signal output ends of the two output first-order RC low-pass filters of the output filter circuit 43 are electrically connected to the control module 10.

The applied force value signal and the output signal of the sensor to be tested pass through the input filter circuit 41, the signal is amplified by the differential amplifying circuit 42 in the ADC sampling circuit 40, and then the ADC samples, meanwhile, the two or more ADCs all adopt the same sampling clock, and the output data of the two or more ADCs can be processed by different or the same digital filtering methods.

The ADC sampling circuit 40 is composed of an input filter circuit 41, a differential amplifier circuit 42, and an output filter circuit 43, and can implement filtering, amplifying, analyzing, transmitting and distributing the sampled data, so as to improve sampling accuracy and conversion efficiency.

In one embodiment, the output signal comprises one of a mV/V signal, a resistance signal, a voltage signal, and a current signal.

For example, because different types of pressure sensors are produced by manufacturers, the output signals of the pressure sensors may be one of mV/V signals, resistance signals, voltage signals and current signals, and therefore, the types of the sensors to be measured are different, and the output signals may also be different, so that the synchronous measurement device 01 can realize synchronous measurement of the different types of sensors to be measured and processing of the different output signals, thereby improving the usability and practicability of the device.

In one embodiment, please refer to fig. 3, fig. 3 is a system block diagram of a synchronous measurement device 01 according to an embodiment of the present application. The control module 10 comprises a singlechip control system, a communication circuit and an upper computer; the single chip microcomputer control system is connected with the upper computer through a communication circuit;

the singlechip control circuit is used for synchronously receiving the force value signal and the output signal, digitally filtering the force value signal and the output signal and packaging the force value signal and the output signal into a data frame; the communication circuit is used for sending the data frame to the upper computer; and the upper computer is used for generating a functional relation between the output signal value and the corresponding force value according to the data frame.

Illustratively, the communication circuit CAN be a RS232/RS485/CAN and other interface transmission circuits, and CAN transmit data to a peripheral data system including an upper computer. The single chip microcomputer control system can be an integrated circuit composed of an STM8S103F3P3 type single chip microcomputer, an STM8L151G4U6 type single chip microcomputer and the like. The upper computer may be a computer directly sending out a control command, typically a PC/hostcomputer/master computer/upper computer, and various signal changes (e.g., pressure, hydraulic pressure, water level, temperature, etc.) may be displayed on the screen.

The single chip microcomputer control system simultaneously inputs force value signals generated by the force value sensor and output signals generated by the tested sensor through two or more paths, the processed signals are placed in the same data frame and sent to an upper computer system through the interface transmission circuit, and the relationship curve graph of the applied force value and the output signals can be obtained through further processing in the upper computer. Specifically, in the process of applying a pressure value from zero to full scale to the measured sensor, an analog voltage signal output by the measured sensor is amplified and filtered by an ADC (analog to digital converter) conversion circuit of the force value sampling module 20 and then converted into a digital signal, the digital signal is transmitted and distributed to an upper computer through a single chip microcomputer control system, and the pressure value sensed by the measured sensor is plotted on the upper computer; and the ADC conversion circuit of the output sampling module 30 amplifies and filters the analog voltage signal output by the sensor under test, and converts the analog voltage signal into a digital signal representative voltage value; and the upper computer reads the data frame containing the data of the upper computer and the data of the lower computer, processes the data frame to obtain a force value-output value relation curve, and can perform subsequent comparison and analysis work according to the force value-output value relation curve. As shown in fig. 4, fig. 4 shows a force value-output value relationship curve, which shows that the output signal is a resistance signal, and shows the force-resistance output relationship diagram of two pressure-sensitive sensors of PF-O-0247 type and PF-O-0493 type, the abscissa is the force value, the ordinate is the resistance output value, and the resistance output of both sensors decreases with the increase of the force.

The control module 10 consisting of the single chip microcomputer control system, the communication circuit and the upper computer can orderly realize the automatic acquisition, reading, processing and display of the electric signals of the force value sensor by the hardware structure system, has the advantages of high intelligent degree and simple and easy operation, reduces the volume of the device, improves the speed of data transmission and improves the measurement precision.

In one embodiment, the control module 10 further includes an I/O interface; the I/O interface is used for outputting corresponding peripheral control signals according to the functional relation.

Illustratively, the control module 10 further includes an I/O interface output circuit, which may be a bridge for information exchange and control between the single chip microcomputer control system and other peripheral devices and circuits, and specifically may output a high level or low level I/O control signal to the peripheral devices, such as a solenoid valve, a relay, and a buzzer, according to the I/O logic selected and defined by the customer. For example, when the applied force value is too large, the upper computer sets the I/O output logic of the single chip microcomputer control system, outputs a high level or low level control signal, further drives the buzzer, sends out an alarm signal, and closes the electromagnetic valve at the same time. The I/O interface circuit can provide customized I/O output signals to drive peripheral devices to control target functions, and the usability and practicability of the device are improved.

In one embodiment, please refer to fig. 5, fig. 5 is a schematic structural diagram of an ac excitation circuit 21 according to an embodiment of the present application. The sensor to be tested applies alternating voltage excitation to generate a force value signal and an output signal through an alternating current excitation circuit 21; the ac excitation circuit 21 is configured to provide a forward excitation voltage and a reverse excitation voltage for generating a force value signal and an output signal.

Illustratively, PA0, PA1 may be an I/O output port of a single chip machine in the control module 10. The alternating current excitation circuit 21 can be composed of a capacitance filter circuit, an electrostatic suppressor, a PMOSFET (P-type MOS transistor), an NMOSFT (N-type MOS transistor), an inverter and I/O ports (PA 0 and PA 1) of a single chip microcomputer.

The generation process of the forward excitation voltage and the reverse excitation voltage in the ac excitation circuit 21 may be: when the PA0 outputs a low level, the PA1 outputs a high voltage, the MOSFET T5B is conducted, and meanwhile, after a signal of the PA0 passes through the PHASE inverter, the T4A is conducted, so that the Y3 is communicated with the high voltage, the Y2 is communicated with GND, and the forward excitation (PHASE 1) of the force value sensor is realized; when the PA0 outputs high voltage, the PA1 outputs low voltage, the MOSFET T4B is conducted, and meanwhile after the signal of the PA0 passes through the PHASE inverter, the T5A is conducted, so that the Y2 is communicated with the high voltage, the Y3 is communicated with GND, and the reverse excitation (PHASE 2) of the force value sensor is realized.

As shown in FIG. 6, the forward excitation is PHASE1, the reverse excitation is PHASE2, and the actual force value signal generated by the force value sensor after the forward excitation and the reverse excitation can be represented by Vin, from which the signal Vos parasitic in the whole circuit due to the thermocouple effect can be further removed. Optionally, upon forward excitation: vadc1= Vin + Vos; in the negative excitation: vadc2= -Vin + Vos; vin = (Vadc 1-Vadc 2)/2.

By adopting alternating current excitation for the force value sensor generating the force value signal and the measured sensor generating the output signal, the thermocouple effect in a line can be removed, and meanwhile, better EMC anti-interference performance can be provided, so that the measurement precision of the device is improved.

In one embodiment, with continued reference to fig. 5, the ac excitation circuit 21 includes: an inverter circuit 211, a MOS transistor circuit 212; the inverter circuit 211 is connected in series with the MOS transistor circuit 212; the MOS transistor circuit 212 is configured to provide different conducting circuits according to an external input voltage; the inverter circuit 211 is used for outputting corresponding forward excitation voltage or reverse excitation voltage according to different conducting circuits.

Illustratively, the inverter circuit 211 may be a circuit in which two inverters are located in fig. 5, and the MOS transistor circuit 212 may be a conducting circuit formed by four MOS transistors, such as T4A, T4B, T5A, and T5B in fig. 5.

When the PA0 end of the inverter circuit 211 outputs a low level and the PA1 end outputs a high voltage, the MOSFET T5B of the MOS transistor circuit 212 is turned on, and meanwhile, after the PA0 signal of the inverter circuit 211 passes through the inverter, the T4A of the MOS transistor circuit 212 is turned on, so that the output end Y3 of the MOS transistor circuit 212 is communicated with the high voltage, and the output end Y2 is communicated with GND, so that the positive excitation of the force value sensor can be realized; when the PA0 end of the inverter circuit 211 outputs a high voltage and the PA1 outputs a low voltage, the MOSFET T4B of the MOS transistor circuit 212 is turned on, and meanwhile, after the PA0 signal of the inverter circuit 211 passes through the inverter, the T5A of the MOS transistor circuit 212 is turned on, so that the output end Y2 of the MOS transistor circuit 212 is communicated with the high voltage, and the output end Y3 is communicated with GND, thereby realizing reverse excitation of the force sensor.

By adopting the AC excitation provided by the phase inverter and the MOS tube together for the force value sensor, the thermocouple effect in a line can be removed, and simultaneously, better EMC (electromagnetic compatibility) anti-interference performance can be provided, thereby improving the measurement precision of the device.

In one embodiment, continuing with reference to fig. 5, the ac excitation circuit 21 includes: the ac excitation circuit 21 further includes: an anti-jamming circuit 213; the anti-interference circuit 213 is connected in parallel with the MOS tube circuit 212; the immunity circuit 213 is used to regulate the high output voltage to protect the ac excitation circuit 21.

The immunity circuit 213 may be, for example, the circuit of the electrostatic suppressor of fig. 5. One end of the anti-interference circuit 213 is connected in parallel with the output end of the circuit where T4A and T4B of the MOS transistor circuit 212 are located, and the other end is Grounded (GND) at the same time. When the external voltage is too high, the device can play a role in protection, can filter various clutter, harmonic waves and interference signals, prevents high-frequency interference and fleeing formed by an MOS tube conducting circuit, improves the anti-interference performance and improves the measurement precision of the device.

In one embodiment, with continued reference to fig. 5, the ac excitation circuit 21 includes: a filter circuit 214; the filter circuit 214 is connected in series with the MOS transistor circuit 212; the filter circuit 214 is used for filtering out noise generated by the power supply of the ac excitation circuit 21.

Illustratively, the filter circuit 214 may be a capacitor filter circuit 214 formed by connecting two capacitors in parallel at the power supply terminal of U2 in fig. 5. The filter circuit 214 has one end connected in series with T4B of the MOS transistor circuit 212 and the other end directly connected to Ground (GND). The pulsating direct current output by the power supply rectifying circuit contains larger alternating current components, the unstable direct current cannot meet the requirement of equipment needing relatively stable direct current voltage, and the pulsating direct current needs to be converted into relatively smooth direct current, so ripples in the rectified output voltage of the power supply end of U2 can be filtered out by adding the filter circuit 214, and the smoothness of the output waveform is improved.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described apparatus embodiments are merely illustrative, and for example, the division of the modules into only one logical functional division may be implemented in other ways, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form. The functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A synchronous measuring device, characterized in that the device comprises: the device comprises a control module, at least one force value sampling module and at least one output sampling module which are arranged in pairs;

the control module is respectively and independently connected with the force value sampling module and the output sampling module;

the force value sampling module is used for collecting a force value signal applied to the measured sensor;

the output sampling module is used for collecting an output signal of the sensor to be detected;

the control module is used for synchronously measuring the force value signal and the output signal and processing the force value signal and the output signal.

2. The synchronous measurement device of claim 1, wherein the force value sampling module and the output sampling module each comprise: an ADC sampling circuit.

3. The synchronous measurement device of claim 2, wherein the ADC sampling circuit comprises an input filter circuit, a differential amplification circuit, and an output filter circuit;

the input filter circuit is electrically connected with the differential amplification circuit, and the differential amplification circuit is electrically connected with the output filter circuit.

4. The synchronous measuring device of claim 1, wherein the output signal comprises one of a mV/V signal, a resistance signal, a voltage signal, and a current signal.

5. The synchronous measuring device of claim 1, wherein the control module comprises a single chip microcomputer control system, a communication circuit and an upper computer; the single chip microcomputer control system is connected with the upper computer through a communication circuit;

the singlechip control circuit is used for synchronously receiving the force value signal and the output signal, digitally filtering the force value signal and the output signal and packaging the force value signal and the output signal into a data frame;

the communication circuit is used for sending the data frame to an upper computer;

and the upper computer is used for generating a functional relation between the output signal value and the corresponding force value according to the data frame.

6. The synchronous measurement device of claim 5, wherein the control module further comprises an I/O interface; and the I/O interface is used for outputting a corresponding peripheral control signal according to the functional relation.

7. The synchronous measuring device of claim 1, wherein the sensor under test generates a force value signal and an output signal by applying an alternating voltage excitation through an alternating current excitation circuit;

the alternating current excitation circuit is used for providing forward excitation voltage and reverse excitation voltage for generating a force value signal and an output signal.

8. The synchronous measurement device of claim 7, wherein the ac excitation circuit comprises: an inverter circuit, a MOS transistor circuit; the inverter circuit is connected with the MOS tube circuit in series;

the MOS tube circuit is used for providing different conducting circuits according to external input voltage;

the inverter circuit is used for outputting corresponding forward excitation voltage or reverse excitation voltage according to the different conducting circuits.

9. The synchronous measurement device of claim 8, wherein the ac excitation circuit further comprises: an anti-jamming circuit; the anti-interference circuit is connected with the MOS tube circuit in parallel;

the anti-jamming circuit is used for adjusting high output voltage so as to protect the alternating current excitation circuit.

10. The synchronous measurement device of claim 9, wherein the ac excitation circuit further comprises: a filter circuit; the filter circuit is connected with the MOS tube circuit in series; the filter circuit is used for filtering noise waves generated by the alternating current excitation circuit power supply.

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