CN210041793U - Analog quantity signal isolation module based on wireless radio frequency - Google Patents
Analog quantity signal isolation module based on wireless radio frequency Download PDFInfo
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- CN210041793U CN210041793U CN201921083690.6U CN201921083690U CN210041793U CN 210041793 U CN210041793 U CN 210041793U CN 201921083690 U CN201921083690 U CN 201921083690U CN 210041793 U CN210041793 U CN 210041793U
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Abstract
The analog quantity signal isolation module based on wireless radio frequency comprises: the input signal sampling and electrical isolation unit is used for realizing secondary isolation and signal conditioning on the analog quantity signal; the digital signal processing unit comprises a central processing unit, a high-speed serial bus and a common serial bus, wherein the central processing unit is respectively connected with the input signal sampling and electrical isolation unit and the output signal isolation unit through the high-speed serial bus; the central processor is connected with the wireless radio frequency communication unit through a common serial bus. The output signal isolation unit comprises a four-channel digital signal isolator, and the output signal conditioning unit comprises a programmable single-loop digital-to-analog converter; the wireless radio frequency communication unit comprises a wireless radio frequency label and a radio frequency antenna and is used for realizing wireless radio frequency identification and wireless data transmission. The utility model discloses the effectual range that has promoted wireless radio frequency collection system collection signal has ensured the stability of collection signal simultaneously.
Description
Technical Field
The utility model relates to an analog signal keeps apart module based on wireless radio frequency relates to the operation monitoring technology field of automation equipment.
Background
Analog signal acquisition systems are used in large scale in the field of automation and chemical engineering, and analog signal acquisition processing data of most automation factories are transmitted to a local control unit in wired modes such as industrial RS 485/232. In fact, under the condition that the environment and the position of part of equipment are not beneficial to cable access, the wireless radio frequency technology is widely used as a solution for wireless data acquisition in an automatic control link by virtue of the advantages of accuracy, stability and the like.
Due to the characteristics of various operation monitoring indexes, extremely wide parameter range and the like of the automation equipment, the requirements on the measuring range and the electrical characteristics of the analog quantity signal transmitter are very high; the safety of the whole equipment group is ensured on the basis of ensuring the feasibility in the process of inputting analog quantity signals in a large-range.
Disclosure of Invention
The method aims to solve the technical problems of remote data acquisition, data calibration and signal isolation of the wireless radio frequency acquisition technology in the prior art. The utility model provides an analog quantity signal isolation module based on radio frequency, the effectual range that has promoted the radio frequency collection system collection signal has ensured the stability of collection signal simultaneously.
The utility model discloses the technical scheme who takes does:
the analog quantity signal isolation module based on wireless radio frequency comprises:
the input signal sampling and electrical isolation unit is used for realizing secondary isolation and signal conditioning on the analog quantity signal;
the digital signal processing unit comprises a central processing unit, a high-speed serial bus and a common serial bus, wherein the central processing unit is respectively connected with the input signal sampling and electrical isolation unit, the output signal isolation unit and the output signal conditioning unit through the high-speed serial bus;
the central processor is connected with the wireless radio frequency communication unit through a common serial bus;
the output signal isolation unit comprises a four-channel digital signal isolator, and is connected with the output signal conditioning unit;
the output signal conditioning unit comprises a programmable single-loop digital-to-analog converter;
the wireless radio frequency communication unit comprises a wireless radio frequency label and a radio frequency antenna and is used for realizing wireless radio frequency identification and wireless data transmission.
The input signal sampling and electrical isolation unit comprises an oversampling ADC chip and a dial switch SW 1;
the input terminal is connected with one side of a dial switch SW1, the other side of the dial switch SW1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a high-frequency switch diode D1, and the other end of the high-frequency switch diode D1 is connected with an oversampling ADC chip; the other side of the dial switch SW1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with one end of a high-frequency switch diode D2, and the other end of the high-frequency switch diode D2 is connected with the oversampling ADC chip.
The high-speed serial bus outputs the signals processed by the central processing unit to the output signal isolation unit to realize the function of accurate analog quantity transmission; the common serial bus outputs TTL level to the wireless radio frequency communication unit by the central processing unit, and the remote wireless transmitting function is realized.
The utility model relates to an analog quantity signal isolation module based on radio frequency, the effectual range that has promoted the radio frequency collection system collection signal has ensured the stability of collection signal simultaneously. The method has the advantages of high flexibility, high reliability and high precision.
Drawings
Fig. 1 is a schematic diagram of the analog signal isolation module of the present invention.
Fig. 2 is a block diagram of the analog signal isolation module according to the present invention.
Detailed Description
As shown in fig. 1 and 2, the analog signal isolation module based on wireless radio frequency includes:
the input signal sampling and electrical isolation unit 1 is used for realizing secondary isolation and signal conditioning on the analog quantity signal;
the digital signal processing unit 2 comprises a central processing unit, a high-speed serial bus and a common serial bus, wherein the central processing unit is respectively connected with the input signal sampling and electrical isolation unit 1, the output signal isolation unit 3 and the output signal conditioning unit 4 through the high-speed serial bus;
the central processor is connected with the wireless radio frequency communication unit 5 through a common serial bus.
The central processing unit is an ARM Cortex-M3 processor.
The high-speed serial bus selects SPI.
The common serial bus adopts MAX 485.
The high-speed serial bus and the central processing unit realize the functions of calibration, filtering and the like of the regulating signal, and ensure the high precision of the transmitting module. Meanwhile, through a high-speed serial bus, the digital signal processing unit 2 can realize the configuration of the input signal sampling and electrical isolation unit 1, and the functions of signal conversion, amplification, attenuation and the like are realized by adjusting configuration information. The digital signal processing unit 2 has a high-speed serial bus and a common serial bus at the same time, the high-speed serial bus outputs the processed signals to the output signal isolation unit 3 and the output signal conditioning unit 4, and the function of accurate analog quantity transmission is achieved. The common serial bus can output TTL level to the wireless radio frequency communication unit 5, and the remote wireless transmitting function is realized.
The output signal isolation unit 3 comprises a four-channel digital signal isolator, and the four-channel digital signal isolator adopts an ADUM1401 standard digital isolator.
The output signal isolation unit 3 is connected with the output signal conditioning unit 4, and the output signal conditioning unit 4 comprises a programmable single-loop digital-to-analog converter which is a DAC8760 digital-to-analog converter.
The wireless radio frequency communication unit 5 comprises a wireless radio frequency label and a radio frequency antenna, wherein the diode in the digital signal processing unit 2 generates TTL level, and the TTL level is output to the wireless radio frequency communication unit 5 through a serial interface. This wireless radio frequency communication unit 5 can guarantee that digital signal transmits intelligent instrument through wireless communication, realizes long-range wireless sampling and measurement, perhaps can reach the host computer calibration with signal transmission, realizes long-range real-time calibration.
The wireless radio frequency tag is an OPP130 remote industrial tag.
The radio frequency antenna is an RF-50HW industrial grade RFID antenna.
The input signal sampling and electrical isolation unit 1 comprises an oversampling ADC chip and a dial switch SW 1; the input terminal is connected with one side of a dial switch SW1, the other side of the dial switch SW1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a high-frequency switch diode D1, and the other end of the high-frequency switch diode D1 is connected with an oversampling ADC chip; the other side of the dial switch SW1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with one end of a high-frequency switch diode D2, and the other end of the high-frequency switch diode D2 is connected with the oversampling ADC chip.
An ADE7912 chip is selected as the oversampling ADC chip;
the dial switch SW1 is a SW DIP-3 dial switch;
the high-frequency switching diodes D1 and D2 are IN4148 high-speed switching diodes.
External analog quantity signals with different measuring ranges are configured with different input signals through a dial switch SW1, a protection circuit consisting of peripheral resistors R1 and R2 of an oversampling ADC chip and high-frequency switch diodes D1 and D2 converts the signals into voltage or current signals of 0-10V or 0-20mA, and the voltage or current signals are input into the oversampling ADC chip, and the method specifically comprises the following steps: the 0-10V signal enters the oversampling ADC chip through a resistor R1 and a high-frequency switch diode D1, and the 0-20mA signal enters the oversampling ADC chip through a resistor R2 and a high-frequency switch diode D2. The oversampling ADC chip realizes secondary isolation and signal conditioning on the analog quantity signal, and the digital quantity signal is output through a high-speed serial bus. The power supply isolation part can ensure that the input end power supply isolation unit bears the direct-current voltage of 1500 VDC. As shown in fig. 2. The whole circuit is matched with an oversampling ADC chip to realize the electric isolation and signal conditioning functions of multi-range signals.
The utility model relates to an analog quantity signal isolation module based on radio frequency adopts 23-50 industry control box encapsulation, is furnished with red LED pilot lamp on the plate.
Claims (3)
1. Analog quantity signal isolation module based on wireless radio frequency, characterized by that this module includes:
the input signal sampling and electrical isolation unit (1) is used for realizing secondary isolation and signal conditioning on the analog quantity signal;
the digital signal processing unit (2) comprises a central processing unit, a high-speed serial bus and a common serial bus, wherein the central processing unit is respectively connected with the input signal sampling and electrical isolation unit (1), the output signal isolation unit (3) and the output signal conditioning unit (4) through the high-speed serial bus;
the central processor is connected with a wireless radio frequency communication unit (5) through a common serial bus;
the output signal isolation unit (3) comprises a four-channel digital signal isolator, and the output signal isolation unit (3) is connected with the output signal conditioning unit (4);
the output signal conditioning unit (4) comprises a programmable single-loop digital-to-analog converter;
the wireless radio frequency communication unit (5) comprises a wireless radio frequency tag and a radio frequency antenna, and the wireless radio frequency communication unit (5) is used for realizing wireless radio frequency identification and wireless data transmission.
2. The wireless radio frequency-based analog quantity signal isolation module of claim 1, wherein: the input signal sampling and electrical isolation unit (1) comprises an oversampling ADC chip and a dial switch SW 1;
the input terminal is connected with one side of a dial switch SW1, the other side of the dial switch SW1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a high-frequency switch diode D1, and the other end of the high-frequency switch diode D1 is connected with an oversampling ADC chip; the other side of the dial switch SW1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with one end of a high-frequency switch diode D2, and the other end of the high-frequency switch diode D2 is connected with the oversampling ADC chip.
3. The wireless radio frequency-based analog quantity signal isolation module of claim 1, wherein: the high-speed serial bus outputs the signals processed by the central processing unit to the output signal isolation unit (3) to realize the function of accurate analog quantity transmission;
and the common serial bus outputs TTL level to the wireless radio frequency communication unit (5) from the central processing unit to realize remote wireless transmitting function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921083690.6U CN210041793U (en) | 2019-07-11 | 2019-07-11 | Analog quantity signal isolation module based on wireless radio frequency |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921083690.6U CN210041793U (en) | 2019-07-11 | 2019-07-11 | Analog quantity signal isolation module based on wireless radio frequency |
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| Publication Number | Publication Date |
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| CN210041793U true CN210041793U (en) | 2020-02-07 |
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| CN201921083690.6U Active CN210041793U (en) | 2019-07-11 | 2019-07-11 | Analog quantity signal isolation module based on wireless radio frequency |
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2019
- 2019-07-11 CN CN201921083690.6U patent/CN210041793U/en active Active
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