Industrial transmitter circuit capable of rapidly switching output signal types

Abstract

The utility model relates to the technical field of industrial automation, in particular to an industrial transmitter circuit capable of rapidly switching output signal types. Comprising an AD / DA conversion integrated circuit U1, the input end of the U1 is connected to a voltage input wiring terminal H1, and the output end of the U1 is connected to an SPI interface input terminal H4 of a single-chip microcomputer. According to the industrial transmitter circuit capable of rapidly switching the output signal types, the problems of high production cost, low circuit integration level and inconvenience in signal output type switching in the prior art are effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial automation technical field, concretely is an industrial transmitter circuit that can quickly switch output signal type. BACKGROUND

[0002] In the field of industrial automation and intelligence, 4-20mA current signal and 0-5V voltage signal are two signal standards. 4-20mA current signal is excellent in complex industrial environment due to its strong anti-interference ability and suitability for long-distance transmission. While 0-5V voltage signal is widely used in industrial automation control system because of its relatively simple signal processing and convenience for direct connection with various control devices. These two signal standards each have unique advantages, meeting different industrial production needs.

[0003] However, the existing industrial transmitter circuit board design has some problems. First, 4-20mA current output circuit and 0-5V voltage output circuit have great differences in structure, and usually two different types of circuit boards need to be made, or they are placed in different areas of a larger circuit board. This design not only increases the cost of making boards, but also makes the production efficiency low. Second, the existing transmitter circuit board has low integration, and it is not convenient to switch the output signal type. The smaller circuit board can only output one kind of signal, while the circuit board that can switch the output signal type almost doubles in size, which makes it difficult for users to meet the demand for small size and convenient switching of output signal type of the transmitter. SUMMARY

[0004] The utility model provides a kind of industrial transmitter circuit that can quickly switch output signal type to solve how to realize the quick switching of 4-20mA current signal and 0-5V voltage signal on single circuit board and keep higher circuit integration in view of the technical problems existing in prior art.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] A kind of industrial transmitter circuit that can quickly switch output signal type is provided, comprising an AD / DA conversion integrated circuit U1, the input end of the U1 is connected to voltage input terminal H1, and the output end is connected to the SPI interface input terminal H4 of single-chip microcomputer;

[0007] The SPI interface input terminal H4 is connected to power supply through pull-up resistors R1, R2, R3 and R4 to improve the stability of signal transmission;

[0008] A double operational amplifier U3 is divided into two parts U3.1 and U3.2, wherein U3.1 is used for signal processing, and U3.2 is used to constitute a voltage follower as a buffer output stage.

[0009] a reference power chip U5, for generating a voltage reference signal;

[0010] a pin seat H3, for switching the output signal type;

[0011] a signal output terminal H2, for outputting the final signal;

[0012] transmission matching resistors R5 to R8, for signal transmission matching;

[0013] capacitors C2, C3, C4, C5, C6, and C7, for power filtering and decoupling.

[0014] The transmitter circuit switches the output signal type to be a 4-20mA current signal or a 0-5V voltage signal through different jumpers of the pin seat H3.

[0015] Further, when the output signal type is a 4-20mA current signal, the 1st and 2nd pins of the pin seat H3 are shorted through a jumper cap, the resistor R20 is shorted with a 0-ohm resistor, the resistor R21 serves as a sampling resistor, the resistor R10 is not welded, the resistor R11 is shorted with a 0-ohm resistor, the U3.2 constitutes a voltage follower as a buffer output stage, the diode D3 is not welded, and the 4-20mA current signal is finally output at the 1st pin of the signal output terminal H2.

[0016] Further, when the output signal type is a 0-5V voltage signal, the transistors Q1, Q2, Q3, and Q4 are not welded, the 2nd and 3rd pins of the pin seat H3 are shorted through a jumper cap, the 1st and 3rd pins of the transistor Q1 are shorted, the 2nd and 3rd pins of the transistor Q3 are shorted, the resistors R20 and R21 have a resistance of 15k, the resistors R9 and R12 and the diodes D1 and D2 are not welded, the 1st and 3rd pins of the transistor Q4 are shorted, the 2nd and 3rd pins of the transistor Q2 are shorted, and the 0-5V voltage signal is finally output at the 1st pin of the signal output terminal H2.

[0017] Further, the AD / DA conversion integrated circuit U1 adopts an NSA2860 model, the input end of the U1 is connected to the voltage input terminal H1, and the output end is connected to the SPI interface input terminal H4 of the single-chip microcomputer, and the U1 is used to realize conversion between analog signals and digital signals.

[0018] Further, the dual operational amplifier U3 adopts an OPA2177 model, the input end of the U3.2 is connected to the output end of the U1, and the output end is connected to the signal output terminal H2, and is used to enhance the driving capability of the signal.

[0019] Further, the reference power chip U5 adopts a model of TL432, an input end of the U5 is connected to a power supply, and an output end is connected to a reference voltage input end of the U3.1, for generating a stable voltage reference signal, so as to ensure the accuracy of the reference voltage of the U3.1 and improve the precision of the output signal.

[0020] Further, the transmission matching resistors R5 to R8 are respectively connected between the output end of the U1 and the input end of the U3.1, for signal transmission matching, preventing signal distortion and attenuation.

[0021] Further, the power supply filtering and decoupling capacitors C2, C3, C4, C5, C6 and C7 are respectively connected between the power supply and the ground, for preventing the influence of the power supply noise on the circuit.

[0022] The industrial transmitter circuit with the quick switching output signal type has the advantages that:

[0023] The industrial transmitter circuit with the quick switching output signal type has the advantages that:

[0024] Through the different jumper settings of the pin seat H3, the industrial transmitter circuit with the quick switching output signal type can realize the quick switching of the 4-20mA current signal and the 0-5V voltage signal on a single circuit board.

[0025] In addition, the industrial transmitter circuit with the quick switching output signal type selects and configures each component, such as the transmission matching resistors R5 to R8 and the power supply filtering and decoupling capacitors C2 to C7, so as to ensure the stability and consistency of the signal in the transmission process, prevent signal distortion and attenuation, and further improve the reliability of the circuit. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The circuit diagram of the industrial transmitter circuit with the quick switching output signal type. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the utility model clearer and more understandable, the utility model will be further described in detail below in combination with the drawings and examples. The examples of the examples are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The examples described below by reference to the drawings are exemplary and are only used to explain the utility model and cannot be understood as limiting the utility model. In addition, it should be understood that the specific examples described herein are only used to explain the utility model and do not limit the utility model.

[0028] In the description of the utility model, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as limiting the utility model.

[0029] In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0030] The following disclosure provides many different embodiments or examples for implementing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of a specific example are described below. Of course, they are only examples and the purpose is not to limit the utility model. In addition, the utility model can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0031] The utility model provides the following preferred examples:

[0032] In order to solve the problems of many types of industrial transmitter circuit boards, high cost of plate making and low production efficiency, the industrial transmitter circuit capable of quickly switching output signal types is provided. Figure 1 The specific connection relationship of the circuit is shown.

[0033] Specifically, the industrial transmitter circuit capable of quickly switching output signal types mainly comprises the following parts:

[0034] The AD / DA conversion integrated circuit U1 adopts the model of NSA2860, and is used for realizing the conversion between analog signals and digital signals.

[0035] The voltage input terminal H1 is used for receiving the external input analog signal.

[0036] The SPI interface input terminal H4 of the single-chip microcomputer is used for communicating with the single-chip microcomputer and transmitting digital signals.

[0037] The pull-up resistors R1, R2, R3 and R4 are connected between the SPI interface input terminal H4 and the power supply, and improve the stability of the SPI interface signal transmission.

[0038] The double operational amplifier U3 adopts the model of OPA2177, and is divided into two parts of U3.1 and U3.2, wherein U3.1 is used for signal processing, and U3.2 is used for constituting a voltage follower as a buffer output stage.

[0039] The reference power supply chip U5 adopts the model of TL432, and is used for generating a stable voltage reference signal.

[0040] The pin seat H3 is used for switching the output signal type.

[0041] The signal output terminal H2 is used for outputting the final signal.

[0042] The transmission matching resistors R5-R8 are used for signal transmission matching.

[0043] The power supply filtering and decoupling capacitors C2, C3, C4, C5, C6 and C7 are used for power supply filtering and decoupling.

[0044] Further, the principle of the utility model is: when need output 4-20mA current signal, through the different jumper setting of pin seat H3, make the circuit enter 4-20mA current signal output mode.Specifically, the 1 foot and 2 foot of pin seat H3 are short-circuited by jumper cap, resistance R20 is short-circuited by 0 ohm resistance, resistance R21 is used as sampling resistance, resistance R10 is not welded, resistance R11 is short-circuited by 0 ohm resistance, U3.2 constitutes voltage follower as buffer output stage, diode D3 is not welded.4-20mA current signal is finally output in the 1st pin of signal output terminal H2.

[0045] Further, when need output 0-5V voltage signal, through another group of jumper setting, make the circuit enter 0-5V voltage signal output mode.Specifically, transistors Q1, Q2, Q3, Q4 are not welded, the 2 foot and 3 foot of pin seat H3 are short-circuited by jumper cap, the 1 foot and 3 foot of transistor Q1 are short-circuited, the 2 foot and 3 foot of transistor Q3 are short-circuited, the resistance R20 and R21 are both 15k, resistance R9, R12, diode D1, D2 are not welded, the 1 foot and 3 foot of transistor Q4 are short-circuited, the 2 foot and 3 foot of transistor Q2 are short-circuited.0-5V voltage signal is finally output in the 1st pin of signal output terminal H2.

[0046] Further, in order to solve the problem of multiple circuit board models and high manufacturing cost in the prior art, the selection of AD / DA conversion integrated circuit U1 is further optimized in the embodiment.U1 adopts NSA2860 model, which has high-performance analog-to-digital conversion (ADC) and digital-to-analog conversion (DAC) functions.The input end of U1 is connected to the voltage input terminal H1 to receive the externally input analog signal, and the output end is connected to the SPI interface input terminal H4 of the single-chip microcomputer to transmit the converted digital signal to the single-chip microcomputer for processing.Using the NSA2860 chip realizes efficient conversion between analog and digital signals, ensuring the accuracy and reliability of the signal.

[0047] Further, the SPI interface of U1 is connected to the power supply through pull-up resistors R1, R2, R3 and R4, which improves the stability of the SPI interface signal transmission.The role of these pull-up resistors is to ensure that the SPI interface is in a high level state when it is not driven, preventing signal drift and false triggering, thereby ensuring the reliability and accuracy of data transmission.

[0048] Further, to further optimize the circuit performance, the embodiment selects OPA2177 dual operational amplifier as U3.OPA2177 has the characteristics of high precision, low noise and low bias current, and is suitable for application scenarios with high requirements for signal quality.U3 is divided into U3.1 and U3.2, wherein U3.1 is used for signal processing, and U3.2 is used to constitute a voltage follower as a buffer output stage.

[0049] Further, the input end of U3.1 is connected to the output end of U1, and the output end is connected to the input end of U3.2. The role of U3.1 is to amplify and process the signal output from U1, ensuring the quality and accuracy of the signal. U3.2 constitutes a voltage follower, with its input end connected to the output end of U3.1 and its output end connected to the signal output terminal H2. The role of U3.2 is to enhance the driving ability of the signal and ensure the stability and reliability of the output signal. Through this design, the stability and consistency of the signal during transmission are ensured, preventing signal distortion and attenuation.

[0050] Further, to further improve the stability and reliability of the circuit, the embodiment adopts TL432 reference power chip as U5. TL432 is a precise adjustable reference voltage source with high precision and high stability. The input end of U5 is connected to the power supply, and the output end is connected to the reference voltage input end of U3.1, used to generate a stable voltage reference signal. By using TL432 chip, the accuracy of the reference voltage of U3.1 is ensured, thereby ensuring the precision of the output signal.

[0051] Further, the output voltage of U5 can be adjusted by external resistance to meet the needs of different application scenarios. For example, when a 0-5V voltage signal is needed, U5 can provide an accurate 2.5V reference voltage, which is amplified and processed by U3.1 to finally output a 0-5V voltage signal. This design not only simplifies the circuit, but also improves the flexibility and adaptability of the circuit.

[0052] Further, in order to solve the problem of inconvenient signal output type switching in the prior art, the embodiment introduces a pin socket H3 for quickly switching the output signal type. When the 1st and 2nd pins of the pin socket H3 are short-circuited by a jumper cap, the circuit enters the 4-20mA current signal output mode; when the 2nd and 3rd pins of the pin socket H3 are short-circuited by a jumper cap, the circuit enters the 0-5V voltage signal output mode.

[0053] Further, the design of the pin socket H3 allows users to quickly switch the signal type according to actual needs by simply setting the jumper, without the need to replace or redesign the circuit board. This design not only simplifies the operation, but also improves the flexibility and practicality of the circuit.

[0054] Further, the signal output terminal H2 is used to output the final signal. Whether it is a 4-20mA current signal or a 0-5V voltage signal, the final output is on the 1st pin of H2. In this way, the unified output of the signal is ensured, simplifying the circuit design and reducing the number and space occupation of components.

[0055] Further, to improve the stability and consistency of signal transmission, the embodiment introduces transmission matching resistors R5-R8. These resistors are connected between the output of U1 and the input of U3.1 for signal transmission matching. By reasonably selecting the resistance value of the resistors, the stability and consistency of the signal during transmission can be ensured, preventing signal distortion and attenuation.

[0056] Further, the transmission matching resistors R5-R8 balance the impedance of the signal, reduce reflection and interference, and improve the quality and reliability of the signal. This design not only improves the performance of the circuit, but also enhances the anti-interference ability of the circuit.

[0057] Further, to improve the stability and purity of the power supply, the embodiment introduces power filter and decoupling capacitors C2, C3, C4, C5, C6, C7. These capacitors are connected between the power supply and the ground for power filtering and decoupling. By reasonably selecting the capacity of the capacitors, the noise and ripple in the power supply can be effectively filtered out, ensuring the stability and purity of the power supply.

[0058] Further, the power filter and decoupling capacitors C2-C7 remove high-frequency noise and ripple in the power supply, improve the quality of the power supply, and prevent the influence of power supply noise on the circuit. This design not only improves the overall performance of the circuit, but also enhances the reliability and stability of the circuit.

[0059] Further, to optimize circuit performance, the embodiment also considers other possible additional features. For example, an overvoltage protection circuit can be added to the circuit to protect the circuit from overvoltage damage. The overvoltage protection circuit can include a zener diode and a current limiting resistor. When the input voltage exceeds the set value, the zener diode is turned on to shunt the excess voltage, protecting the circuit from damage.

[0060] In addition, a temperature compensation circuit can also be added to the circuit to compensate for the influence of temperature changes on signal output. The temperature compensation circuit can include a thermistor and an operational amplifier, which detects the ambient temperature and adjusts the output signal to ensure the stability and accuracy of the signal.

[0061] The industrial transmitter circuit capable of quickly switching output signal types provided by the embodiment can realize the quick switching of 4-20mA current signals and 0-5V voltage signals on a single circuit board, thereby reducing the production cost, improving the production efficiency, and maintaining a high circuit integration degree. By using the NSA2860 AD / DA conversion integrated circuit, the OPA2177 double operational amplifier, and the TL432 reference power supply chip, the accuracy and reliability of the signals are ensured. By setting different jumpers of the pin seat H3, the quick switching of the signal types is realized, the operation is simplified, and the flexibility and practicability of the circuit are improved. By reasonably selecting and configuring various components, such as the transmission matching resistors R5-R8 and the power filter and decoupling capacitors C2-C7, the stability and consistency of the signals in the transmission process are ensured, the signal distortion and attenuation are prevented, and the overall performance and reliability of the circuit are further improved.

[0062] The circuit design provided by the embodiment not only solves the problems of high production cost, low circuit integration degree, and inconvenient signal output type switching in the prior art, but also provides an efficient, reliable, and economical solution, thereby meeting the diversified needs of the industrial transmitter in actual applications.

[0063] The beneficial effects of the utility model are embodied in the above-mentioned preferred embodiments of the utility model, and are not used to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. An industrial transmitter circuit capable of rapidly switching output signal types, characterized by, It comprises an AD / DA conversion integrated circuit U1, the input end of which is connected to the voltage input terminal H1, and the output end is connected to the SPI interface input terminal H4 of the single-chip microcomputer; The SPI interface input terminal H4 is connected to the power supply through pull-up resistors R1, R2, R3 and R4 to improve the stability of signal transmission. A double operational amplifier U3 is divided into two parts, U3.1 and U3.2, wherein U3.1 is used for signal processing, and U3.2 is used to form a voltage follower as a buffer output stage. A reference power supply chip U5 is used to generate a voltage reference signal. A pin socket H3 is used to switch the output signal type. A signal output terminal H2 is used to output the final signal. Transmission matching resistors R5 to R8 are used for signal transmission matching. Capacitors C2, C3, C4, C5, C6 and C7 are used for power supply filtering and decoupling. The transmitter circuit switches the output signal type to be a 4-20mA current signal or a 0-5V voltage signal through different jumpers of the pin socket H3.

2. The fast-switchable output signal type industrial transmitter circuit of claim 1, wherein, When the output signal type is a 4-20mA current signal, the 1st and 2nd pins of the pin socket H3 are short-circuited through a jumper cap, the resistor R20 is short-circuited with a 0 ohm resistor, the resistor R21 is used as a sampling resistor, the resistor R10 is not welded, the resistor R11 is short-circuited with a 0 ohm resistor, the U3.2 forms a voltage follower as a buffer output stage, the diode D3 is not welded, and the 4-20mA current signal is finally output at the 1st pin of the signal output terminal H2.

3. The fast switchable output signal type industrial transmitter circuit of claim 1, wherein, When the output signal type is a 0-5V voltage signal, the transistors Q1, Q2, Q3 and Q4 are not welded, the 2nd and 3rd pins of the pin socket H3 are short-circuited through a jumper cap, the 1st and 3rd pins of the transistor Q1 are short-circuited, the 2nd and 3rd pins of the transistor Q3 are short-circuited, the resistors R20 and R21 have a resistance of 15k, the resistors R9 and R12, the diodes D1 and D2 are not welded, the 1st and 3rd pins of the transistor Q4 are short-circuited, the 2nd and 3rd pins of the transistor Q2 are short-circuited, and the 0-5V voltage signal is finally output at the 1st pin of the signal output terminal H2.

4. The fast switchable output signal type industrial transmitter circuit of claim 1, wherein, The AD / DA conversion integrated circuit U1 adopts the model NSA2860, the input end of which is connected to the voltage input terminal H1, and the output end is connected to the SPI interface input terminal H4 of the single-chip microcomputer, which is used to realize the conversion between analog signals and digital signals.

5. The fast switchable output signal type industrial transmitter circuit of claim 1, wherein, The double operational amplifier U3 adopts the model OPA2177, the input end of the U3.2 is connected to the output end of the U1, and the output end is connected to the signal output terminal H2, which is used to enhance the driving capability of the signal.

6. The fast-switchable output signal type industrial transmitter circuit of claim 1, wherein, The reference power supply chip U5 adopts the model TL432, the input end of which is connected to the power supply, and the output end is connected to the reference voltage input end of the U3.1, which is used to generate a stable voltage reference signal to ensure the accuracy of the reference voltage of the U3.1 and improve the precision of the output signal.

7. The fast switchable output signal type industrial transmitter circuit of claim 1, wherein, The transmission matching resistors R5 to R8 are respectively connected between the output end of the U1 and the input end of the U3.1, which are used for signal transmission matching to prevent signal distortion and attenuation.

8. The fast switchable output signal type industrial transducer circuit of claim 1, wherein, The power filter and decoupling capacitors C2, C3, C4, C5, C6, C7 are connected between the power supply and the ground respectively, for preventing the influence of the power supply noise on the circuit.

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