Electromagnetic flowmeter for detecting external analog signals

Abstract

The utility model provides an electromagnetic flowmeter for detecting external analog signals, which comprises a flow processing circuit, an analog signal front-end sampling circuit, an analog signal filtering and amplifying circuit, an analog signal conversion circuit, a key circuit, a display circuit and a microcontroller circuit. The sampling module is used for sampling analog signals, the filtering amplification circuit is used for holding the sampled analog signals, then the ADC conversion chip is used for converting the analog signals into digital signals, the microcontroller is used for coding the digital signals, and data are displayed to a user through the display module.

Description

Technical Field

[0001] The utility model relates to a technology for detecting an external analog signal, in particular to an electromagnetic flowmeter for detecting the external analog signal. Background Art

[0002] Electromagnetic flowmeters are usually used in industrial sites, tap water, sewage treatment, chemical plants, agricultural irrigation and other places. Electromagnetic flowmeters are usually used to measure flow, and pressure transmitters are also used to detect pressure conditions, or pH sensors are used to detect water quality and turbidity sensors. Because these instruments are traditionally used in multiple devices that work separately, sometimes the devices cannot be put together, resulting in the inability to observe the data of multiple sensors at the same time. Sometimes, abnormalities occur on site, which are caused by multiple factors, and the situation on site cannot be understood in the first place. The utility model iterates the traditional electromagnetic flowmeter circuit, integrates the analog signal sampling function, and can realize the simultaneous connection of multiple analog signals, such as connecting a pressure transmitter and a pH sensor at the same time. At this time, the pipeline pressure or pH value or other information can be understood while observing the flow, and the simultaneous monitoring of multiple sensor data can be realized to ensure the accuracy of the treatment of tap water, sewage or other liquids. Summary of the invention

[0003] The utility model provides an electromagnetic flowmeter for detecting external analog signals, which samples the external analog signals and holds the sampled analog signals through a filtering and amplifying circuit, then an ADC conversion chip converts the analog signals into digital signals, a microcontroller encodes the digital signals, and displays the data to a user through a display module.

[0004] In order to achieve the above object, the technical solution of the utility model is as follows:

[0005] An electromagnetic flowmeter for detecting external analog signals, comprising a flow processing circuit, an analog signal front-end sampling circuit, an analog signal filtering and amplifying circuit, an analog signal conversion circuit, a touch button circuit, a display circuit and a microcontroller circuit, and is characterized in that:

[0006] The analog signal front-end sampling circuit samples the signal through a sampling resistor and converts the external analog signal into a differential signal;

[0007] The analog signal filtering and amplifying circuit performs filtering and amplifying processing on the differential signal converted by the analog signal front-end sampling circuit;

[0008] The analog signal conversion circuit converts the differential analog signal into a digital signal;

[0009] The microcontroller circuit encodes the converted digital signal;

[0010] The display circuit is used to display the coded information of the external sensor;

[0011] The key touch circuit is configured by the user to set the parameters of the corresponding sensor externally;

[0012] The flow processing circuit is used to collect the flow passing through the flow meter.

[0013] Beneficial effects of the utility model:

[0014] (1) The utility model discloses an electromagnetic flowmeter for detecting external analog signals. The analog signal front-end sampling circuit can convert the external analog signal into a more stable differential signal. At the same time, the differential mode and common mode lightning arresters can effectively protect the circuit when used outdoors, and the differential mode and common mode filtering circuits can effectively filter out external interference.

[0015] (2) The utility model is an electromagnetic flowmeter for detecting external analog signals. Multiple external sensors can be connected at one time. The microcontroller can read multiple sensor data at the same time through a time-sharing sampling processing algorithm to ensure the real-time performance of each sensor data.

[0016] (3) The utility model is an electromagnetic flowmeter for detecting external analog signals. Through the display module, the parameters of multiple sensors can be configured and the corresponding upper and lower limit thresholds and other parameters can be set. When the data of the sensor is abnormal, an alarm message can be output. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 This is a module diagram of an electromagnetic flowmeter for detecting external analog signals according to the utility model.

[0018] Attached Figure 2 The utility model discloses an electromagnetic flowmeter analog signal front-end sampling circuit for detecting external analog signals.

[0019] Attached Figure 3 The utility model discloses an electromagnetic flowmeter analog signal filtering and amplifying circuit for detecting an external analog signal.

[0020] Attached Figure 4 The utility model discloses an electromagnetic flowmeter analog signal conversion circuit for detecting an external analog signal.

[0021] Attached Figure 5 The utility model discloses an electromagnetic flowmeter touch key circuit for detecting external analog signals.

[0022] Attached Figure 6 The utility model discloses an electromagnetic flowmeter display circuit for detecting external analog signals.

[0023] Attached Figure 7The utility model discloses an electromagnetic flowmeter microcontroller circuit for detecting external analog signals. DETAILED DESCRIPTION

[0024] The technical solution of the utility model is further described in detail below with reference to specific implementation modes and accompanying drawings.

[0025] As attached Figure 1 As shown: An electromagnetic flowmeter for detecting external analog signals, comprising a flow processing circuit, an analog signal front-end sampling circuit, an analog signal filtering and amplifying circuit, an analog signal conversion circuit, a touch button circuit, a display circuit and a microcontroller circuit.

[0026] As attached Figure 2 As shown: the analog signal front-end sampling circuit samples the signal through the sampling resistor and converts the external analog signal into a differential signal; specifically, the signal is sampled through resistors R5 and R12, and the power supply VCC4 is the reference voltage. The purpose is to stabilize the sampled positive and negative signals at around the voltage VCC4, convert the external analog signal into a differential signal pair, and improve the sampling accuracy and data stability. P1, P2 and P3 form differential and common mode lightning protection to prevent thunderstorms from damaging the circuit.

[0027] As attached Figure 3 As shown: the analog signal filter amplifier circuit filters and amplifies the differential signal converted by the analog signal front-end sampling circuit; chip U2 filters and amplifies the differential signal pair converted by the front-end sampling circuit, and resistor R6 can control the amplification multiple. The operational amplifier U4 and pins 6 and 7 of U2 form an integration circuit. When the external input signal is interfered, the output of U4 serves as the reference voltage of U2, and this voltage will change with the change of the external signal voltage. Since the reference can change synchronously with the external interference, the anti-interference ability of the circuit is improved. The U3 chip is used as the signal post-amplifier. Assume that the output voltage of U2 is V1, the square input voltage of U3 is V2, and the voltage of V2 is VCC5. Therefore, the output voltage SI of U3 is as follows: V o =( R8*V2-R4*(V1-V2)) / R 8， C1, C2 and C6 form differential mode and common mode filtering to filter out spike noise in the analog signal to ensure signal stability.

[0028] As attached Figure 4 As shown: the analog signal conversion circuit converts the differential analog signal into a digital signal. The chip U1 can convert the differential analog signals SI+ and SI- into a digital signal. U1 is a high-precision ADC chip, and U1 can encode the amplification factor. In this way, the amplification factor of analog signals of different sizes can be set to ensure that the circuit can be applied to various types of sensors.

[0029] As attached Figure 5 , Attachment Figure 6 Combined with the attached Figure 7 As shown: Through the display module, microcontroller and key module, the digital signal converted from the front-end analog signal is encoded and the data is displayed to the user. When multiple external sensors are connected, the microcontroller can detect them in time and set the magnification of the corresponding sensor in advance through the key, so that the values ​​of multiple sensors can be displayed simultaneously in the display, realizing real-time online monitoring of multiple sensors. And the user can set the corresponding alarm threshold for each sensor, and can quickly alarm when the sensor data is abnormal.

Claims

1. An electromagnetic flowmeter for detecting external analog signals, comprising a flow processing circuit, an analog signal front-end sampling circuit, an analog signal filtering and amplifying circuit, an analog signal conversion circuit, a key circuit, a display circuit and a microcontroller circuit, wherein: The analog signal front-end sampling circuit samples the signal through a sampling resistor and converts the external analog signal into a differential signal; The analog signal filtering and amplifying circuit performs filtering and amplifying processing on the differential signal converted by the analog signal front-end sampling circuit; The analog signal conversion circuit converts the differential analog signal into a digital signal; The microcontroller circuit encodes the converted digital signal; The display circuit is used to display the coded information of the external sensor; The button circuit is configured by a user to set parameters of corresponding sensors externally; The flow processing circuit is used to collect the flow passing through the flow meter.

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