CN113645113B - 3.3V power supply RS485 communication system - Google Patents
3.3V power supply RS485 communication system Download PDFInfo
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- CN113645113B CN113645113B CN202110923055.XA CN202110923055A CN113645113B CN 113645113 B CN113645113 B CN 113645113B CN 202110923055 A CN202110923055 A CN 202110923055A CN 113645113 B CN113645113 B CN 113645113B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/10—Current supply arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a 3.3V power supply RS485 communication system, which relates to the technical field of communication and comprises a power supply module, a DC-DC conversion module, a voltage detection module, a main control module, a switch control module, an RS485 communication module and a communication protection module; the DC-DC conversion module is used for changing voltage, the voltage detection module is used for detecting output voltage, the main control module is used for receiving and processing signals and outputting control signals, the switch control module is used for controlling on-off of a power supply, the RS485 communication module is used for receiving and sending data, and the communication protection module is used for protecting the RS485 communication module. The 3.3V power supply RS485 communication system converts a power supply into required voltage through isolation, detects the voltage, prevents the power supply voltage from being out of order to influence the work of the RS485 communication system, simplifies the traditional communication system, and simultaneously strengthens the anti-interference capability and the system protection capability of data transmission.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a 3.3V power supply RS485 communication system.
Background
The RS485 bus is a field bus form widely used in the field of measurement and control, and because a balanced transmission and differential receiving mode is adopted, can effectively overcome common mode interference, has higher data transmission rate and transmission distance, the method is applied to some devices with complex environments and simultaneously supports multi-node communication, but currently, due to the complexity of the field environment, RS485 communication is easily subjected to various interferences and easily causes communication abnormity, in addition, the traditional RS485 communication sends out instructions through a Central Processing Unit (CPU) to realize the receiving and sending of the RS485 communication, the RS485 communication system has higher power consumption and high cost, therefore, the RS485 communication system can change the system voltage from the traditional 5V to 3.3V in consideration of the reasons of energy saving, low power consumption and the like, and the high-precision stable system voltage is also an important factor for maintaining the RS485 communication work.
Disclosure of Invention
The embodiment of the invention provides a 3.3V power supply RS485 communication system, which aims to solve the problems in the background technology.
According to a first aspect of the embodiments of the present invention, a 3.3V power supply RS485 communication system is provided, where the 3.3V power supply RS485 communication system includes a power module, a DC-DC conversion module, a voltage detection module, a main control module, a switch control module, an RS485 communication module, and a communication protection module;
the power supply module is used for providing electric energy for the RS485 communication system;
the DC-DC conversion module is used for carrying out DC-DC conversion on the electric energy provided by the power supply module;
the voltage detection module is used for connecting the output end of the DC-DC conversion module, detecting the output voltage of the DC-DC conversion module and outputting a detected voltage signal;
the main control module is used for being connected with the second end of the voltage detection module, receiving and processing the voltage signal output by the voltage detection module, and outputting a control signal and a data signal;
the switch control module is used for receiving the control signal output by the main control module and controlling the work of the power supply module;
the RS485 communication module is used for receiving the data signals output by the main control module and processing, sending and receiving the data signals;
and the communication protection module is used for eliminating high-frequency signals superposed by the outside on the RS485 communication module and is used for carrying out overvoltage protection on the RS485 communication module.
Compared with the prior art, the invention has the beneficial effects that: the 3.3V power supply RS485 communication system carries out DC-DC isolation conversion on a power supply to convert the power supply into 3.3V voltage, and carries out real-time detection on the converted voltage, thereby preventing RS485 communication data from being interfered and preventing RS485 communication elements from being damaged due to voltage faults, simplifying the traditional RS485 communication system, reducing power consumption and cost, and enhancing the anti-interference capability and the protection capability during data transmission.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic block diagram of a 3.3V power supply RS485 communication system according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a DC-DC conversion module and a voltage detection module according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a switch control module according to an embodiment of the present invention.
Fig. 4 is a schematic block diagram of an RS485 communication module and a communication protection module according to an embodiment of the present invention.
Fig. 5 is a circuit diagram of an RS485 communication module and a communication protection module according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a 3.3V power supply RS485 communication system, where the 3.3V power supply RS485 communication system includes a power module 1, a DC-DC conversion module 2, a voltage detection module 3, a main control module 4, a switch control module 5, an RS485 communication module 6, and a communication protection module 7;
specifically, the power module 1 is used for providing electric energy for the RS485 communication system; the first end of the power supply module 1 is connected with the first end of the DC-DC conversion module 2;
the DC-DC conversion module 2 is used for carrying out DC-DC conversion on the electric energy provided by the power supply module 1; the second end of the DC-DC conversion module 2 is connected with the first end of the voltage detection module 3, and the third end of the DC-DC conversion module 2 is connected with the first end of the RS485 communication module 6;
the voltage detection module 3 is used for detecting the voltage output by the DC-DC conversion module 2 and outputting a detected voltage signal; the second end of the voltage detection module 3 is connected with the first end of the main control module 4;
the main control module 4 is used for receiving and processing the voltage signal output by the voltage detection module 3 and outputting a control signal and a data signal; the second end of the main control module 4 is connected with the second end of the switch control module 5;
the switch control module 5 is used for receiving the control signal output by the main control module 4 and controlling the work of the power supply module 1; the first end of the switch control module 5 is connected with the second end of the power supply module 1;
the RS485 communication module 6 is used for receiving the data signals output by the main control module 4 through the isolator, and processing and sending the received data signals; the second end of the RS485 communication module is connected with the third end of the main control module 4;
the communication protection module 7 is used for eliminating high-level signals superposed on the RS485 communication module and performing overvoltage protection on the RS485 communication module 6; and the communication protection module 7 is connected with the third end of the RS485 communication module 6.
In a specific embodiment, the power module 1 may employ a dc voltage source to provide electric energy for the RS485 communication system, which is not described herein; the DC-DC conversion module 2 may adopt a control mode of a switching power supply or a special DC-DC converter U2 to convert the electric energy output by the power supply module 1 into a 3.3V supply voltage through its internal isolation; the voltage detection module 3 may adopt a resistance voltage division type or a dedicated voltage sampling chip to detect the voltage signal output by the DC-DC conversion module 2; the main control module 4 can adopt a CPU or a singlechip to realize the functions of data acquisition, processing and transmission and control the work of the power module 1; the switch control module 5 can drive the switch tube to work in an isolation control mode, so that the on-off of the power module 1 is realized, and the condition that the switch tube cannot work due to insufficient driving of the main control module 4 is avoided; in the RS485 communication module 6, a photoelectric coupler or a dedicated signal isolation chip may be used for transmitting signals in the transmission signals, and a dedicated RS485 transceiver U3 may be used for receiving and transmitting data in the signal conversion; the communication protection module 7 can adopt a transient voltage suppression diode to absorb common mode and differential mode interference in an RS485 communication system, and adopts a gas discharge tube to prevent interference caused by overvoltage and form common mode and differential mode protection.
Example 2: based on embodiment 1, please refer to fig. 2, in an embodiment of the 3.3V power supply RS485 communication system according to the present invention, the DC-DC conversion module 2 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a DC-DC converter U2;
specifically, a first end of the first capacitor C1 is connected to the second capacitor C2 and a first end of the DC-DC converter U2, a second end of the first capacitor C1 is connected to a second end of the second capacitor C2 and a second end of the DC-DC converter U2, a third end of the DC-DC converter U2 is connected to a first end of the third capacitor C3 and a first end of the fourth capacitor C4 and outputs a voltage, and a second end of the third capacitor C3 and a second end of the fourth capacitor C4 are connected to a fourth end of the DC-DC converter U2.
Further, the voltage detection module 3 includes a first resistor R1, a second resistor R2, and a fifth capacitor C5; the main control module 4 comprises a first controller U1;
specifically, a first end of the first resistor R1 is connected to the third end of the DC-DC converter U2, a second end of the first resistor R1 is connected to the first end of the second resistor R2, the first end of the fifth capacitor C5 and the first end of the first controller U1, and a second end of the fifth capacitor C5 and the second end of the second resistor R2 are connected to the fourth end and the ground end of the DC-DC converter U2.
Further, the switch control module 5 includes a third resistor R3, a first coupler J1, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first diode D1, a second diode D2, a third diode D3, a first power supply +5V, a first switch tube M1, and a relay K1; the power module 1 comprises a power supply DC;
specifically, a first end of a third resistor R3 is connected to a second end of the first controller U1, a second end of the third resistor R3 is connected to a first end of a first coupler J1, a second end of the first coupler J1 is grounded, a third end of the first coupler J1 is connected to +5V of the first power source, a cathode of a third diode D3 and the relay K1 through a fourth resistor R4, a fourth end of the first coupler J1 is connected to a fifth resistor R5, a cathode of a first diode D1 and a seventh resistor R7, an anode of the first diode D1 is connected to the other end of the fifth resistor R5 through the sixth resistor R6, the cathode of the second diode D2 and the gate of the first switch tube M1, the drain of the first switch tube M1 is connected with the anode of the third diode D3 and the other end of the relay K1, the source of the first switch tube M1, the anode of the second diode D2 and the other end of the seventh resistor R7 are connected with the ground, and the contact of the relay K1 is connected in series between the power supply DC and the first end of the DC-DC converter U2.
In a specific embodiment, the DC-DC converter U2 may convert an input power into a 3.3V voltage by isolating the power, and herein, a DC-DC converter U2 formed by a MAX17599 transformer may be used, where the first capacitor C1 and the second capacitor C2 filter the input power, and the third capacitor C3 and the fourth capacitor C4 filter the output 3.3V voltage; the first controller U1 can adopt an STC series single chip microcomputer or an STM32 series single chip microcomputer to receive and process detected signals and protect and control an RS485 communication system power supply; the first coupler J1 can adopt an HMHA2801 photocoupler to drive the first switch tube M1 in an isolated manner; the first switch tube M1 can select a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) to drive the relay K1 to operate, so as to switch on and off the power module 1 in the RS485 communication system.
Example 3: on the basis of embodiment 1, please refer to fig. 4 and fig. 5, in a specific embodiment of the 3.3V power supply RS485 communication system according to the present invention, the RS485 communication module 6 includes an isolation control unit 601 and a communication unit 602; the communication protection module 7 comprises a first protection unit 701 and a second protection unit 702;
specifically, the isolation control unit 601 is configured to receive the data signal output by the main control module 4 and transmit the data signal to the communication unit 602 in an isolated manner;
a communication unit 602, configured to receive and transmit the data signal output by the isolation control unit 601;
the first protection unit 701 is used for eliminating a high-level signal superposed on the RS485 communication module;
the second protection unit 702 is configured to perform overvoltage protection on the RS485 communication module 6; the first end of the isolation control unit 601 is connected to the third end of the main control module 4, the second end of the isolation control unit 601 is connected to the first end of the first protection unit 701 through the communication unit 602, and the second end of the first protection unit 701 is connected to the second protection unit 702.
Further, the isolation control unit 601 includes an eighth resistor R8, a second power supply +3.3V, a second coupler J2, a ninth resistor R9, a tenth resistor R10, a third coupler J3, an eleventh resistor R11, and a sixth capacitor C6;
specifically, a first end of the second coupler J2 is connected to the second power supply +3.3V, a second end of the second coupler J2 is grounded through the eighth resistor R8, a second end of the second coupler J2 is further connected to the first communication end of the first controller U1, a third end of the second coupler J2 is connected to the first end of the ninth resistor R9, a fourth end of the second coupler J2 is grounded, a first end of the third coupler J3 is connected to the second communication end of the first controller U1 through the tenth resistor R10, a second end of the third coupler J3 is grounded, a third end of the third coupler J3 is connected to the second power supply +3.3V and the sixth capacitor C6 through the eleventh resistor R11, and a fourth end of the third coupler J3 and the other end of the sixth capacitor C6 are grounded.
Further, the communication unit 602 includes an RS485 transceiver U3, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, and a coil L1;
specifically, the first end of the RS485 transceiver U3 is connected to the second end of the ninth resistor R9, the second end and the third end of the RS485 transceiver U3 are connected to the third end of the third coupler J3, the fourth end of the RS485 transceiver U3 is connected to the second power supply +3.3V, the fifth end of the RS485 transceiver U3, the thirteenth resistor R13 and the first end of the coil L1 are connected to the twelfth resistor R12, the sixth end and the seventh end of the RS485 transceiver U3 are grounded, and the other end of the thirteenth resistor R13, the eighth end of the RS485 transceiver U3 and the second end of the coil L1 are connected to the fourteenth resistor R14.
Further, the first protection unit 701 includes a first transient suppression diode TV1, a second transient suppression diode TV2, and a third transient suppression diode TV 3;
specifically, the first transient suppression diode TV1 is connected to the third terminal of the coil L1 and the third transient suppression diode TV3, the other terminal of the first transient suppression diode TV1 is connected to the fourth terminal of the coil L1 and the second transient suppression diode TV2, and the other terminal of the second transient suppression diode TV2 and the other terminal of the third transient suppression diode TV3 are grounded.
Further, the second protection unit 702 includes a first gas discharge tube G1, a second gas discharge tube G2, and a third gas discharge tube G3;
specifically, first gas discharge tube G1 connects the third end of coil L1 and third gas discharge tube G3, the other end of first gas discharge tube G1 connects the fourth ends of second gas discharge tube G2 and coil L1, and the other ends of second gas discharge tube G2 and third gas discharge tube G3 are grounded.
In a specific embodiment, the second coupler J2 and the third coupler J3 may employ TLP521 or 6N137 photocouplers, where the second coupler J2 serves as a data sending end of the first end of the RS485 transceiver U3, and the third coupler J3 serves as a data receiving end of the first end of the RS485 transceiver U3, when the second communication end of the first controller U1 outputs a high level, the RS485 transceiver U3 is in a receiving state, and when the second communication end of the first controller U1 outputs a low level, the RS485 transceiver U3 is turned on, where the RS transceiver U3 may employ a MAX13487 or SP3485 chip; the first transient suppression diode TV1, the second transient suppression diode TV2, and the third transient suppression diode TV3 clamp the voltage to the highest operating voltage of the RS485 transceiver U3; the first gas discharge tube G1, the second gas discharge tube G2, and the third gas discharge tube G3 may be JSE-141N gas discharge tubes.
In the embodiment of the invention, the voltage provided by the power module 1 is converted into 3.3V voltage in an isolation way through the DC-DC conversion module 2, 3.3V voltage is provided for the RS485 communication module 6, whether the voltage output by the DC-DC conversion module 2 is in 3.3V or not is detected in real time through the voltage detection module 3, and the detected voltage signal is transmitted to the main control module 4, when the detected voltage signal is unstable, the main control module 4 controls the switch control module 5 to disconnect the power module 1, the RS485 communication system stops working, and the communication protection module carries out secondary protection on the RS485 communication module 6, so that the transmission of data influenced by common-mode and differential-mode interference and overvoltage interference is avoided, and meanwhile, the RS485 communication module 6 is prevented from being damaged; in the RS485 communication module, when the second communication terminal of the first controller U1 outputs a high level, the RS485 transceiver U3 is in a receiving state, and when the second communication terminal of the first controller U1 outputs a low level, the RS485 transceiver U3 is turned on, in the communication protection module 7, when there is an overvoltage, the first gas discharge tube G1 performs differential mode protection, and the second gas discharge tube G2 and the third gas discharge tube G3 perform common mode protection.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (2)
1. The utility model provides a 3.3V power supply RS485 communication system which characterized in that:
the 3.3V power supply RS485 communication system comprises a power supply module, a DC-DC conversion module, a voltage detection module, a main control module, a switch control module, an RS485 communication module and a communication protection module;
the power supply module is used for providing electric energy for the RS485 communication system;
the DC-DC conversion module is used for carrying out DC-DC conversion on the electric energy provided by the power supply module;
the voltage detection module is used for connecting the output end of the DC-DC conversion module, detecting the output voltage of the DC-DC conversion module and outputting a detected voltage signal;
the main control module is used for being connected with the second end of the voltage detection module, receiving and processing the voltage signal output by the voltage detection module, and outputting a control signal and a data signal;
the switch control module is used for receiving the control signal output by the main control module and controlling the work of the power supply module;
the RS485 communication module is used for receiving the data signals output by the main control module and processing, sending and receiving the data signals;
the communication protection module is used for eliminating high-frequency signals superposed by the outside on the RS485 communication module and performing overvoltage protection on the RS485 communication module;
the DC-DC conversion module comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a DC-DC converter;
the first end of the first capacitor is connected with the second capacitor and the first end of the DC-DC converter, the second end of the first capacitor is connected with the second end of the second capacitor and the second end of the DC-DC converter, the third end of the DC-DC converter is connected with the first end of the third capacitor and the first end of the fourth capacitor and outputs voltage, and the second end of the third capacitor and the second end of the fourth capacitor are connected with the fourth end of the DC-DC converter;
the voltage detection module comprises a first resistor, a second resistor and a fifth capacitor; the main control module comprises a first controller;
the first end of the first resistor is connected with the third end of the DC-DC converter, the second end of the first resistor is connected with the first end of the second resistor, the first end of the fifth capacitor and the first end of the first controller, and the second end of the fifth capacitor and the second end of the second resistor are connected with the fourth end and the ground end of the DC-DC converter;
the RS485 communication module comprises an isolation control unit and a communication unit;
the isolation control unit is used for receiving the data signal output by the main control module and transmitting the data signal to the communication unit in an isolated manner;
the communication unit is used for receiving and sending the data signals output by the isolation control unit;
the first end of the isolation control unit is connected with the third end of the main control module, and the second end of the isolation control unit is connected with the first end of the communication unit;
the communication protection module comprises a first protection unit and a second protection unit;
the first protection unit is used for eliminating a high-level signal superposed on the RS485 communication module;
the second protection unit is used for performing overvoltage protection on the RS485 communication module;
the first end of the first protection unit is connected with the second end of the communication unit, and the second end of the first protection unit is connected with the second protection unit;
the isolation control unit comprises an eighth resistor, a second power supply, a second coupler, a ninth resistor, a tenth resistor, a third coupler, an eleventh resistor and a sixth capacitor;
the first end of the second coupler is connected with a second power supply, the second end of the second coupler is grounded through an eighth resistor, the second end of the second coupler is also connected with the first communication end of the first controller, the third end of the second coupler is connected with the first end of a ninth resistor, the fourth end of the second coupler is grounded, the first end of the third coupler is connected with the second communication end of the first controller through a tenth resistor, the second end of the third coupler is grounded, the third end of the third coupler is connected with the second power supply and a sixth capacitor through an eleventh resistor, and the fourth end of the third coupler and the other end of the sixth capacitor are grounded;
the communication unit comprises an RS485 transceiver, a twelfth resistor, a thirteenth resistor, a fourteenth resistor and a coil;
the first end of the RS485 transceiver is connected with the second end of the ninth resistor, the second end and the third end of the RS485 transceiver are connected with the third end of the third coupler, the fourth end of the RS485 transceiver is connected with the second power supply and is connected with the fifth end of the RS485 transceiver, the thirteenth resistor and the first end of the coil through the twelfth resistor, the sixth end and the seventh end of the RS485 transceiver are grounded and are connected with the other end of the thirteenth resistor, the eighth end of the RS485 transceiver and the second end of the coil through the fourteenth resistor;
the first protection unit comprises a first transient suppression diode, a second transient suppression diode and a third transient suppression diode;
the first transient suppression diode is connected with the third end of the coil and the third transient suppression diode, the other end of the first transient suppression diode is connected with the fourth end of the coil and the second transient suppression diode, and the other end of the second transient suppression diode and the other end of the third transient suppression diode are grounded;
the second protection unit comprises a first gas discharge tube, a second gas discharge tube and a third gas discharge tube;
the first gas discharge tube is connected with the third end of the coil and the third gas discharge tube, the other end of the first gas discharge tube is connected with the fourth ends of the second gas discharge tube and the coil, and the other end of the second gas discharge tube and the other end of the third gas discharge tube are grounded.
2. The 3.3V power supply RS485 communication system according to claim 1, wherein the switch control module comprises a third resistor, a first coupler, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first diode, a second diode, a third diode, a first power supply, a first switch tube and a relay; the power supply module comprises a power supply;
the first end of the third resistor is connected with the second end of the first controller, the second end of the third resistor is connected with the first end of the first coupler, the second end of the first coupler is grounded, the third end of the first coupler is connected with the first power supply, the cathode of the third diode and the relay through the fourth resistor, the fourth end of the first coupler is connected with the fifth resistor, the cathode of the first diode and the seventh resistor, the anode of the first diode is connected with the other end of the fifth resistor, the cathode of the second diode and the grid electrode of the first switching tube through the sixth resistor, the drain electrode of the first switching tube is connected with the anode of the third diode and the other end of the relay, the source electrode of the first switching tube, the anode of the second diode and the other end of the seventh resistor are connected with the ground end, and the contact point of the relay is connected between the power supply and the first end of the DC-DC converter in series.
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