Anti-interference eight-channel temperature acquisition module

Abstract

The utility model belongs to the technical field of temperature acquisition modules, and particularly discloses an anti-interference eight-channel temperature acquisition module. Comprising a temperature acquisition circuit used for acquiring temperature data, an isolation protection circuit used for isolating external interference signals, a communication interface circuit used for communicating with external equipment and having an isolation function, and a single-chip microcomputer, and the temperature acquisition circuit is electrically connected with the isolation protection circuit. According to the utility model, through cooperation of the temperature sampling circuit, the isolation protection circuit, the communication interface circuit and the single-chip microcomputer, each channel is isolated and filtered by using the isolation unit and the filtering unit, the anti-interference capability is strong, each channel does not influence each other, and the communication interface circuit has an isolation function, so that the communication interface circuit is convenient to use. Through the dual-isolation anti-interference design of the isolation protection circuit and the communication interface circuit, the external interference signal of each channel can be effectively blocked, the temperature data processing speed is improved, and the accuracy of multichannel temperature acquisition is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to temperature acquisition module technical field, concretely is an eight channel temperature acquisition module of anti -interference type. BACKGROUND

[0002] In the industrial production process, need to monitor the temperature of multiple key parts to ensure the safety and stability of the production process, eight channel temperature acquisition module can connect multiple temperature sensors simultaneously, real -time acquisition and transmission temperature data, provide accurate temperature information for industrial automation control system.

[0003] Such as patent document application No. 201820111966.6, eight channel input temperature acquisition ware is disclosed, including eight temperature acquisition circuit, multiplex analog switch, controller, communication module, temperature acquisition circuit's output and multiplex analog switch's input are connected, multiplex analog switch's output and controller's input are connected, controller's communication end and communication module are connected, temperature acquisition circuit includes temperature sensing circuit, signal amplifier, analog-digital converter, temperature sensing circuit's output and signal amplifier's input are connected, signal amplifier's output and analog-digital converter's output are connected, analog-digital converter's output and multiplex analog switch's input are connected, the utility model technical scheme realizes eight channel's temperature acquisition, simple, practical, reliable.

[0004] However, due to multiple temperature acquisition circuit is influenced by external environment and interference signal, make temperature acquisition temperature drift is big, and each channel is influenced test data again, make the data precision of test is poor, thereby reduce the precision of multichannel temperature acquisition, therefore we need to propose an eight channel temperature acquisition module of anti -interference type to solve the above -mentioned problems, make it can effectively block each channel's external interference signal, improve temperature data processing speed, thereby improve the precision of multichannel temperature acquisition. UTILITY MODEL CONTENT

[0005] The utility model is aimed at providing an eight channel temperature acquisition module of anti -interference type, can effectively block each channel's external interference signal, improve temperature data processing speed, thereby improve the precision of multichannel temperature acquisition, to solve the problem in the background art.

[0006] In order to achieve the above object, the utility model provides the following technical scheme: an anti -interference type eight channel temperature acquisition module, including temperature acquisition circuit for collecting temperature data, the isolation protection circuit for isolating external interference signal, communication interface circuit and singlechip for with isolation function with external device communication, temperature acquisition circuit and isolation protection circuit electric connection, isolation protection circuit and communication interface circuit electric connection, singlechip is connected with temperature acquisition circuit, isolation protection circuit and communication interface circuit electrically respectively;

[0007] The isolation protection circuit includes an isolation unit for independently isolating and protecting each channel by using an optocoupler, an interface unit for external connection, and a filter unit for filtering each channel.

[0008] Preferably, the temperature acquisition circuit includes an ADC chip U2 connected with the single-chip microcomputer and a voltage stabilizer D2 connected with the ADC chip U2, a capacitor C10 is connected between the 10th pin and the 11th pin of the ADC chip U2, a ground capacitor C11 is connected to the 10th pin of the ADC chip U2, a ground capacitor C12 is connected to the 11th pin of the ADC chip U2, an inductor L4 is connected between the 3rd pin and the 4th pin of the voltage stabilizer D2, an inductor L3 is connected between the 6th pin and the 1st pin of the voltage stabilizer D2, the 2nd pin of the voltage stabilizer D2 is connected with a capacitor C5, a capacitor C6, a capacitor C7 and a capacitor C8 arranged in parallel, one end of the capacitor C8 is connected with a resistor R63 and a capacitor C63 arranged in parallel, the 5th pin of the voltage stabilizer D2 is connected with a MOS tube Q4, the 3rd pin of the MOS tube Q4 is connected with the 4th pin of the voltage stabilizer D2 through a resistor R10 and a resistor R11, the 6th pin of the voltage stabilizer D2 is connected with a resistor R7, one end of the resistor R7 is connected with a resistor R6, one end of the resistor R6 is connected with a MOS tube Q3, the 1st pin of the MOS tube Q3 is connected with the connection end of the capacitor C7 and the capacitor C6 through a resistor R62.

[0009] Preferably, the isolation unit comprises couplers U12, U13, U14, U15, U16, U17, U18 and U19 arranged in parallel, the 2-pin of coupler U12 is connected to the 1-pin of coupler U13, the 2-pin of coupler U13 is connected to the 1-pin of coupler U12 through resistors R36 and R40, the 2-pin of coupler U14 is connected to the 1-pin of coupler U15, the 2-pin of coupler U15 is connected to the 1-pin of coupler U14 through resistors R37 and R41, the 2-pin of coupler U16 is connected to the 1-pin of coupler U17, the 2-pin of coupler U17 is connected to the 1-pin of coupler U16 through resistors R38 and R42, the 2-pin of coupler U18 is connected to the 1-pin of coupler U19, and the 2-pin of coupler U19 is connected to the 1-pin of coupler U18 through resistors R39 and R43.

[0010] Preferably, the filter unit comprises capacitors C56 and C61 arranged in parallel, capacitors C57 and C60 arranged in parallel, and capacitors C64 and C66 arranged in parallel, one end of capacitors C56 and C61 is connected to the connection end of couplers U12, U14, U16 and U18, one end of capacitors C57 and C60 is connected to the connection end of couplers U13, U15, U17 and U19, and the two ends of capacitors C64 and C66 are connected to one end of capacitors C56 and C61 and one end of capacitors C57 and C60, respectively.

[0011] Preferably, the interface unit comprises a connector CN2 with 10 pins, couplers U19, U18, U17, U16, U15, U14, U13 and U12 are connected to the 1-pin to 8-pin of connector CN2, respectively, and the two ends of capacitors C64 and C66 are connected between the 9-pin and 10-pin of connector CN2.

[0012] Preferably, the communication interface circuit comprises communication chips U8 and U9, the 1-pin and 4-pin of communication chip U9 are connected to the 4-pin and 2-pin of communication chip U8, respectively, an optocoupler U10 is connected to the 3-pin of communication chip U8, a resistor R27 for connecting 3.3V voltage is connected to the 1-pin of optocoupler U10, a resistor R28 for connecting 5.0V voltage is connected to the 4-pin of optocoupler U10, and an interface circuit with circuit protection function is further connected to communication chip U9.

[0013] Preferably, the interface circuit includes a connector CN1 with 10 pins, a voltage stabilizing diode TV1 is connected to the 10 pin of the connector CN1, a resistor 19 is connected between the 7 pin and the 8 pin of the connector CN1, the 8 pin of the connector CN1 is connected with the 7 pin of the communication chip U9 through a fuse F2, and the connecting end of the fuse F2 is connected in parallel with a transient suppression diode DS2 and a ground resistor R24, the 7 pin of the connector CN1 is connected with the 6 pin of the communication chip U9 through a fuse F1, and the connecting end of the fuse F1 is connected in parallel with a transient suppression diode DS1 and a resistor R23 for connecting a 5.0V voltage.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] 1、 the utility model discloses a temperature sampling circuit, isolation protection circuit, communication interface circuit and the cooperation of singlechip, utilize the isolation unit and filter unit to each channel is isolated and filter processing, and the anti -interference ability is strong, makes each way between each other does not influence, and communication interface circuit has the isolation function, through the double isolation anti -interference design of isolation protection circuit and communication interface circuit, can effectively block each channel's external interference signal, improves temperature data processing speed, thereby improves the precision of multichannel temperature acquisition. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the module block diagram of the utility model;

[0017] Figure 2 It is the circuit diagram of temperature acquisition circuit of the utility model;

[0018] Figure 3 It is the circuit diagram of isolation protection circuit of the utility model;

[0019] Figure 4 It is the circuit diagram of communication interface circuit of the utility model. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0021] Please refer to Figures 1-4The utility model provides a technical scheme: an anti -interference eight channel temperature acquisition module, including temperature acquisition circuit for gathering temperature data, the isolation protection circuit for isolating external interference signal, the communication interface circuit for with isolation function and with external equipment communication and singlechip, temperature acquisition circuit and isolation protection circuit electric connection, isolation protection circuit and communication interface circuit electric connection, singlechip is connected with temperature acquisition circuit, isolation protection circuit and communication interface circuit electrically respectively,

[0022] The temperature acquisition circuit includes an ADC chip U2 connected with the single-chip microcomputer and a voltage stabilizer D2 connected with the ADC chip U2, a capacitor C10 is connected between the 10th pin and the 11th pin of the ADC chip U2, a ground capacitor C11 is connected to the 10th pin of the ADC chip U2, a ground capacitor C12 is connected to the 11th pin of the ADC chip U2, an inductor L4 is connected between the 3rd pin and the 4th pin of the voltage stabilizer D2, an inductor L3 is connected between the 6th pin and the 1st pin of the voltage stabilizer D2, the 2nd pin of the voltage stabilizer D2 is connected with a capacitor C5, a capacitor C6, a capacitor C7 and a capacitor C8 arranged in parallel, and an inductor L1 is connected between one connection end of the capacitor C7 and the capacitor C8, one end of the capacitor C8 is connected with a resistor R63 and a capacitor C63 arranged in parallel, the 5th pin of the voltage stabilizer D2 is connected with a MOS tube Q4, the 3rd pin of the MOS tube Q4 is connected with the 4th pin of the voltage stabilizer D2 through a resistor R10 and a resistor R11, the 6th pin of the voltage stabilizer D2 is connected with a resistor R7, one end of the resistor R7 is connected with a resistor R6, one end of the resistor R6 is connected with a MOS tube Q3, the 1st pin of the MOS tube Q3 is connected with the connection end of the capacitor C7 and the capacitor C6 through a resistor R62, when collecting temperature data, the ADC chip U2 is connected with an external temperature sensor, data processing is carried out through the ADC chip U2, and the peripheral electrical devices of the ADC chip U2 are matched to complete ADC sampling, so that the temperature sampling precision reaches 0.1, and the temperature data drift phenomenon is reduced.

[0023] The isolation protection circuit includes an isolation unit for independently isolating and protecting each channel by using an optical coupling, an interface unit for external connection, and a filter unit for filtering each channel.

[0024] The isolation unit includes couplers U12, U13, U14, U15, U16, U17, U18 and U19 arranged in parallel, the 2-pin of coupler U12 is connected with the 1-pin of coupler U13, the 2-pin of coupler U13 is connected with the 1-pin of coupler U12 through resistors R36 and R40, the 2-pin of coupler U14 is connected with the 1-pin of coupler U15, the 2-pin of coupler U15 is connected with the 1-pin of coupler U14 through resistors R37 and R41, the 2-pin of coupler U16 is connected with the 1-pin of coupler U17, the 2-pin of coupler U17 is connected with the 1-pin of coupler U16 through resistors R38 and R42, the 2-pin of coupler U18 is connected with the 1-pin of coupler U19, the 2-pin of coupler U19 is connected with the 1-pin of coupler U18 through resistors R39 and R43, each channel is protected by couplers U12, U13, U14, U15, U16, U17, U18 and U19, and each channel does not affect each other, improving the anti-interference between each channel.

[0025] The filter unit includes capacitors C56 and C61 arranged in parallel, capacitors C57 and C60 arranged in parallel, and capacitors C64 and C66 arranged in parallel, one end of capacitors C56 and C61 is connected to the connection end of couplers U12, U14, U16 and U18, one end of capacitors C57 and C60 is connected to the connection end of couplers U13, U15, U17 and U19, and the two ends of capacitors C64 and C66 are connected to one end of capacitors C56 and C61 and one end of capacitors C57 and C60 respectively, capacitors C56 and C61, capacitors C57 and C60, and capacitors C64 and C66 are arranged in parallel respectively, which can increase the total capacitance value of the circuit, thereby improving the filtering effect, and the parallel capacitors can reduce the equivalent series resistance (ESR), improve the stability and filtering efficiency of the circuit, couplers U12 to U19 play a role in signal transmission and isolation in the circuit, they couple the input signal to the filter unit, while isolating the input and output, preventing signal reflection and interference.

[0026] The interface unit includes a connector CN2 with 10 pins, the couplers U19, U18, U17, U16, U15, U14, U13 and U12 are connected to pins 1-8 of the connector CN2 respectively, and the C64 and the capacitor C66 are connected across pins 9 and 10 of the connector CN2 respectively. The connector CN1 and the connector CN2 are both set as RS485 interfaces, facilitating connection with external connection devices.

[0027] The communication interface circuit includes communication chips U8 and U9, the pins 1 and 4 of the communication chip U9 are connected to the pins 4 and 2 of the communication chip U8 respectively, the pin 3 of the communication chip U8 is connected to an optocoupler U10, the pin 1 of the optocoupler U10 is connected to a resistor R27 for connecting a 3.3V voltage, the pin 4 of the optocoupler U10 is connected to a resistor R28 for connecting a 5.0V voltage, and the communication chip U9 is also connected to an interface circuit with circuit protection function. The optocoupler U10 is used to improve the anti-interference ability of the communication interface. The pin 1 of the optocoupler U10 is connected to a 3.3V voltage, and the pin 4 is connected to a 5.0V voltage. Such configuration helps to stabilize the working state of the optocoupler and ensures the stability of signal transmission. The cross connection of the communication chips U8 and U9 helps to improve the integrity and reliability of the signal. The resistors R27 and R28 are used to connect 3.3V and 5.0V voltages respectively. They not only provide the necessary working current for the optocoupler U10, but also play a role in current limiting, protecting the optocoupler U10 from overcurrent damage and ensuring the stability and reliability of the communication interface in complex electromagnetic environments.

[0028] The interface circuit includes a connector CN1 with 10 pins, a zener diode TV1 is connected to the pin 10 of the connector CN1, a resistor R19 is connected between the pins 7 and 8 of the connector CN1, a fuse F2 is connected between the pin 8 of the connector CN1 and the pin 7 of the communication chip U9, and a transient suppression diode DS2 and a resistor R24 are connected in parallel across the ground at the connection end of the fuse F2 and the communication chip U9. A fuse F1 is connected between the pin 7 of the connector CN1 and the pin 6 of the communication chip U9, and a transient suppression diode DS1 and a resistor R23 for connecting a 5.0V voltage are connected in parallel across the ground at the connection end of the fuse F1 and the communication chip U9. The zener diode TV1 is connected to the pin 10 of the connector CN1 to absorb excessive voltage and protect the circuit from overvoltage damage. The transient suppression diodes DS1 and DS2 are connected in parallel across the connection end of the fuses F1 and F2 and the communication chip U9 to absorb transient high energy such as lightning strikes or electrostatic discharge, protect the circuit from transient voltage damage, and ensure stable operation of the communication chip and the entire system.

[0029] The temperature data acquisition is carried out through the ADC chip U2, the sampling precision reaches 0.1, each channel is isolated and filtered by using an isolation unit and a filter unit, the anti-interference ability is strong, each path does not affect each other, the communication interface circuit has an isolation function, through the double isolation anti-interference design of the isolation protection circuit and the communication interface circuit, the external interference signals of each channel can be effectively blocked, the temperature data processing speed is improved, and therefore the precision of the multi-channel temperature acquisition is improved.

[0030] Although the embodiments of the utility model have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An anti-interference eight-channel temperature acquisition module, characterized by: It includes a temperature acquisition circuit for acquiring temperature data, an isolation protection circuit for isolating external interference signals, a communication interface circuit for communicating with external equipment and having an isolation function, and a single-chip microcomputer. The temperature acquisition circuit is electrically connected to the isolation protection circuit, the isolation protection circuit is electrically connected to the communication interface circuit, and the single-chip microcomputer is electrically connected to the temperature acquisition circuit, the isolation protection circuit, and the communication interface circuit respectively. The isolation protection circuit includes an isolation unit for independently isolating and protecting each channel using an optical coupler, an interface unit for connecting to the outside, and a filtering unit for filtering each channel. The interface unit is electrically connected to the isolation unit and the filtering unit respectively.

2. The anti-interference eight-channel temperature acquisition module according to claim 1, characterized in that: The temperature acquisition circuit includes an ADC chip U2 connected to the single-chip microcomputer and a voltage regulator D2 connected to the ADC chip U2. A capacitor C10 is connected between pins 10 and 11 of the ADC chip U2, a ground capacitor C11 is connected to pin 10 of the ADC chip U2, and a ground capacitor C12 is connected to pin 11 of the ADC chip U2. An inductor L4 is connected between pins 3 and 4 of the voltage regulator D2, an inductor L3 is connected between pins 6 and 1 of the voltage regulator D2, and capacitors C5, C6, C7, and C8 are connected in parallel to pin 2 of the voltage regulator D2. , and an inductor L1 is connected between one connection end of the capacitor C7 and the capacitor C8, one end of the capacitor C8 is connected to a resistor R63 and a capacitor C63 arranged in parallel, pin 5 of the voltage regulator D2 is connected to a MOS transistor Q4, pin 3 of the MOS transistor Q4 is connected to pin 4 of the voltage regulator D2 through resistors R10 and R11, pin 6 of the voltage regulator D2 is connected to a resistor R7, one end of the resistor R7 is connected to a resistor R6, one end of the resistor R6 is connected to a MOS transistor Q3, and pin 1 of the MOS transistor Q3 is connected to the connection end of the capacitor C7 and the capacitor C6 through a resistor R62.

3. The anti-interference eight-channel temperature acquisition module according to claim 1, characterized in that: The isolation unit includes a coupler U12, a coupler U13, a coupler U14, a coupler U15, a coupler U16, a coupler U17, a coupler U18 and a coupler U19 which are arranged in parallel. Pin 2 of the coupler U12 is connected to pin 1 of the coupler U13. Pin 2 of the coupler U13 is connected to pin 1 of the coupler U12 via resistors R36 and R40. Pin 2 of the coupler U14 is connected to pin 1 of the coupler U15. Pin 2 of the coupler U15 is connected to pin 1 of the coupler U14 through resistors R37 and R41, pin 2 of the coupler U16 is connected to pin 1 of the coupler U17, pin 2 of the coupler U17 is connected to pin 1 of the coupler U16 through resistors R38 and R42, pin 2 of the coupler U18 is connected to pin 1 of the coupler U19, and pin 2 of the coupler U19 is connected to pin 1 of the coupler U18 through resistors R39 and R43.

4. The anti-interference eight-channel temperature acquisition module according to claim 3, characterized in that: The filtering unit includes a capacitor C56 and a capacitor C61 arranged in parallel, a capacitor C57 and a capacitor C60 arranged in parallel, and a capacitor C64 and a capacitor C66 arranged in parallel, one end of the capacitor C56 and the capacitor C61 is connected to the connection end of the coupler U12, the coupler U14, the coupler U16 and the coupler U18, one end of the capacitor C57 and the capacitor C60 is connected to the connection end of the coupler U13, the coupler U15, the coupler U17 and the coupler U19, and the two ends of C64 and the capacitor C66 are respectively connected to one end of the capacitor C56 and the capacitor C61 and one end of the capacitor C57 and the capacitor C60.

5. The anti-interference eight-channel temperature acquisition module according to claim 4, characterized in that: The interface unit includes a connector CN2 with 10 pins. The coupler U19, coupler U18, coupler U17, coupler U16, coupler U15, coupler U14, coupler U13 and coupler U12 are respectively connected to pins 1 to 8 of the connector CN2. The two ends of C64 and capacitor C66 are respectively connected between pins 9 and 10 of the connector CN2.

6. The anti-interference eight-channel temperature acquisition module according to claim 5, characterized in that: The communication interface circuit includes a communication chip U8 and a communication chip U9. Pin 1 and pin 4 of the communication chip U9 are respectively connected to pin 4 and pin 2 of the communication chip U8. Pin 3 of the communication chip U8 is connected to an optocoupler U10. Pin 1 of the optocoupler U10 is connected to a resistor R27 for connecting to a 3.3V voltage. Pin 4 of the optocoupler U10 is connected to a resistor R28 for connecting to a 5.0V voltage. The communication chip U9 is also connected to an interface circuit with a circuit protection function.

7. The anti-interference eight-channel temperature acquisition module according to claim 6, characterized in that: The interface circuit includes a connector CN1 with 10 pins, a voltage regulator diode TV1 is connected to pin 10 of the connector CN1, a resistor 19 is connected between pins 7 and 8 of the connector CN1, pin 8 of the connector CN1 is connected to pin 7 of the communication chip U9 through a fuse F2, and a transient suppression diode DS2 to ground and a resistor R24 ​​to ground are connected in parallel to the connection end between the fuse F2 and the communication chip U9, and pin 7 of the connector CN1 is connected to pin 6 of the communication chip U9 through a fuse F1, and a transient suppression diode DS1 to ground and a resistor R23 for connecting a 5.0V voltage are connected in parallel to the connection end between the fuse F1 and the communication chip U9.

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