CN206627793U - A kind of general configurable sensor harvester - Google Patents

Abstract

The utility model discloses a universal configurable sensor acquisition device, which comprises a conditioning circuit, a single-chip computer, a keyboard and a conversion circuit; the conditioning circuit converts the collected sensor output current into a voltage and transmits it to the single-chip computer through an AD converter; the single-chip computer The corresponding relationship between the measured value and the collected current value displays the detection result on the display screen, and at the same time sends the digital quantity to the conversion circuit; the conversion circuit converts the received digital quantity into a stable current and transmits it to the receiving end. The utility model does not need to understand the specific measurement principles of each sensor, nor does it need to set up a special analog conditioning circuit, which improves the versatility of the sensor acquisition device, and can realize the configurable relationship between the output current and the physical quantity, and make full use of the current The range improves the accuracy of the measured value and reduces the error in the acquisition process, so that the subsequent devices that use this current can obtain more accurate information.

Description

A Universal Configurable Sensor Acquisition Device

technical field

The utility model relates to the technical field of sensors, in particular to a universal configurable sensor acquisition device.

Background technique

Sensors are an extremely important part of industrial production. All aspects of industrial production need to be detected by sensors, and the data is fed back to the control center, so as to intervene in time for abnormal nodes and ensure the normal progress of industrial production. Therefore, the collection and detection of the output current of the sensor is also very important. Sensor acquisition devices for many industrial applications have low versatility and are usually limited by the type of sensor. For industries that need to use a variety of sensors, the acquisition device has a lot of equipment, takes up a lot of space, and the cost is too high. Regular inspection of equipment wastes a lot of manpower, material resources and time.

The output current of the sensor is generally between 4-20mA. If the change range of the sensor detects the substance is not large, the change range of the output current is also small, and other current ranges will be wasted, and when there is a small change in the physical quantity, the current The value cannot clearly express the change of the substance detected by the sensor, and other devices that use this current will also be affected by the current error, reducing the accuracy of the entire production process.

Utility model content

In view of the above problems, the purpose of this utility model is to provide a universal configurable sensor acquisition device with high versatility, small acquisition error and high precision. The technical solution is as follows:

A general-purpose configurable sensor acquisition device, including a conditioning circuit, a single-chip microcomputer, a keyboard, and a conversion circuit; the conditioning circuit converts the collected sensor output current into a voltage, and then converts the voltage analog signal into a digital quantity through an AD converter and then transmits it to the single-chip microcomputer ;The single-chip microcomputer displays the detection result on the display screen according to the corresponding relationship between the measured value input by the keyboard and the collected current value, and at the same time sends the digital quantity to the conversion circuit; the conversion circuit converts the received digital quantity into a stable current transmission to the receiving end.

Further, the conversion circuit includes an optocoupler isolation circuit, a DA conversion circuit and a voltage-to-current conversion circuit connected in sequence.

Further, the single-chip microcomputer adopts MSP430F149 low-power single-chip microcomputer.

Furthermore, the AD converter uses a 16-bit high-precision ADC-AD7793.

The beneficial effects of the utility model are: the utility model directly collects and organizes the current output by the sensor with a transmitter, without knowing the specific measurement principle of each sensor, and does not need to set up a special analog conditioning circuit, which improves the accuracy of the sensor. The versatility of the acquisition device; for industrial production that needs to use a variety of sensors, there is no longer a need for a lot of space to place the acquisition devices of various sensors; at the same time, the single-chip microcomputer artificially changes the relationship between the output current and the physical quantity according to the actual situation of industrial production , and can realize the configurable relationship between the output current and the physical quantity, make full use of the current range, improve the accuracy of the measured value, reduce the error in the acquisition process, and make the subsequent device using this current obtain more accurate information .

Description of drawings

FIG. 1 is a schematic structural diagram of a general-purpose configurable sensor acquisition device of the present invention.

detailed description

Below in conjunction with the specific embodiment of accompanying drawing, the utility model is described in further detail. As shown in Figure 1, a general-purpose configurable sensor acquisition device includes a conditioning circuit, a single-chip microcomputer, a keyboard and a conversion circuit.

The conditioning circuit converts the collected sensor output current into a voltage, making it suitable for the input of the analog-to-digital converter, and then transmits it to the single-chip microcomputer through the AD converter. The conditioning circuit here is a general conditioning circuit, and there is no need to specially set up a specific analog conditioning circuit according to the measurement principle of the sensor, which improves the versatility of the sensor acquisition device.

The main function of the AD conversion circuit is to digitize the analog signal, so as to transmit the digital signal to the microcontroller. What the analog-to-digital conversion module adopts is 16 high-precision ADC-AD7793 of ADI Company.

The function of the single-chip microcomputer is to display the detection result on the display screen according to the corresponding relationship between the physical quantity measured by the sensor input by the keyboard and the output current value of the sensor, and at the same time send the new digital quantity to the conversion circuit. The adjustment function is mainly completed by the single-chip microcomputer, the display screen and the keyboard. The corresponding relationship between the physical quantity measured by the sensor and the output current value of the sensor is input by the keyboard. After processing by the single-chip microcomputer, the final detection result is displayed on the display screen. If it is necessary to change the relationship between the output current and the measured value, the new relationship between the two is transmitted to the microcontroller through the keyboard. This embodiment adopts the MSP430F149 low-power single-chip microcomputer of Texas Instruments Texas Instruments.

The conversion circuit converts the received digital quantity into a stable current and transmits it to the receiving end. The output signal of the single-chip microcomputer passes through the optocoupler isolation, DA conversion circuit and voltage-current conversion circuit in turn in the conversion circuit, and finally outputs a stable current. Among them, the main function of optocoupler isolation is to improve the anti-interference ability of the circuit, which is beneficial to the stability of the output current; the DA conversion circuit converts the digital signal into a voltage analog signal; the voltage-current conversion circuit includes an operational amplifier, a triode and several resistors and capacitors. It converts the voltage output by the DA conversion circuit into a stable current. The conversion circuit is mainly composed of TLP293_4 optocoupler from TOSHIBA, TLC5615 digital-to-analog converter from Texas Instruments.

Claims (4)

1. a kind of general configurable sensor harvester, it is characterised in that including modulate circuit, single-chip microcomputer, keyboard and conversion Circuit；The current output sensor collected is converted to voltage by modulate circuit, then turns voltage analog signal through a/d converter Single-chip microcomputer is sent to after being changed to digital quantity；Single-chip microcomputer according to input through keyboard be measured the current value collected between it is corresponding close System shows testing result on a display screen, while digital quantity is sent into translation circuit；The numeral that translation circuit will receive Amount is converted to stable electricity and is streamed to receiving terminal.

2. general configurable sensor harvester according to claim 1, it is characterised in that the translation circuit includes Optical coupling isolation circuit, DA change-over circuits and the voltage-current converter circuit being sequentially connected with.

3. general configurable sensor harvester according to claim 1, it is characterised in that the single-chip microcomputer uses MSP430F149 low-power scms.

4. general configurable sensor harvester according to claim 1, it is characterised in that the a/d converter uses 16 high-precision adc-AD7793.