3G module isolation communication system based on capacitive coupling

Abstract

The utility model relates to a 3G module isolation communication system based on capacitive coupling. The 3G module isolation communication system comprises an isolation module and a communication control module which are electrically connected. The communication control module is electrically connected with a data sending module and a data receiving module. The isolation module input end is electrically connected with a main system end; the communication control module is electrically connected with the module end; the isolation module comprises an isolation capacitor UG1; and a communication sending signal MGTXD output by the main system end is connected to a 3-pin INA port of the isolation capacitive coupler UG1.

Description

Technical Field

[0001] The utility model relates to a 3G module isolation communication system based on capacitive coupling. Background Art

[0002] The demand for 3G module communications in overseas markets continues to grow. With the continuous development of communication technology, many overseas regions still rely on 3G networks for data transmission and communication. These regions have an urgent need for stable, reliable and cost-effective 3G module communication solutions to meet their growing communication needs. Optocouplers achieve signal isolation through photoelectric conversion, and have the characteristics of high speed, stability and strong anti-interference ability. They are suitable for complex environments and application scenarios with high performance requirements; while capacitive coupling uses capacitors for signal isolation, has a simple structure and low cost, and is suitable for low voltage and simple circuit design needs.

[0003] In order to meet the demand for 3G communication in some overseas regions, we designed a 3G module isolation communication system based on capacitive coupling, with special attention to reducing costs and optimizing structure. By carefully selecting and configuring components, we achieved a balance between high efficiency and low cost of the circuit. At the same time, the compact structure design reduces the occupied space, making it more suitable for various application scenarios. This circuit not only meets the communication needs, but also greatly reduces the product cost. Utility Model Content

[0004] The technical problem to be solved by the utility model is generally to provide a 3G module isolation communication system based on capacitive coupling, the isolation capacitive coupling is used for electrical isolation, the capacitive coupling is used instead of the optical coupling, and the cost is reduced.

[0005] In order to solve the above problems, the technical solution adopted by the utility model is:

[0006] In order to achieve electrical isolation and reduce costs, the utility model provides a 3G module isolation communication system based on capacitive coupling, the system includes an isolation module and a communication control module which are electrically connected; the communication control module is electrically connected to a data sending module and a data receiving module respectively;

[0007] The input terminal of the isolation module is used to electrically connect to the main system terminal;

[0008] The communication control module is used for electrically connecting the module ends;

[0009] The isolation module includes an isolation capacitor UG1;

[0010] The communication transmission signal M_G_TXD outputted by the main system is connected to the 3-pin INA port of the isolation capacitor UG1;

[0011] The communication control signal M_RESERVED of the main system is connected to the 4-pin INB port of the isolation capacitor UG1;

[0012] The communication receiving signal M_G_RXD of the main system is connected to the 5-pin OUTC port of the isolation capacitor UG1. The 3-pin INA port of the isolation capacitor UG1 is connected to the main system power supply DVDD through the chip resistor RG1, and is connected to the main system reference ground GND through the chip capacitor CG2;

[0013] The 4-pin INB port of the isolation capacitor UG1 is connected to the main system power supply DVDD through the chip resistor RG2, and is connected to the main system reference ground GND through the chip capacitor CG3;

[0014] The 5-pin OUTC port of the isolation capacitor UG1 is connected to the main system power supply DVDD through the chip resistor RG3, and is connected to the main system reference ground GND through the chip capacitor CG4;

[0015] The 1-pin VDD1 port of the isolation capacitor UG1 is connected to one end of the chip capacitor CG1, and one end of the chip capacitor CG1 is also connected to the main system power supply DVDD and the 1-pin VDD1 port of the isolation capacitor UG1. The other end of the chip capacitor CG1 is connected to the main system reference ground GND and the 2-pin GND1 port of the isolation capacitor UG1.

[0016] The 10-pin VDD2 port of the isolation capacitor UG1 is electrically connected to the chip capacitor CG5, one end of the chip capacitor CG5 is connected to the module end working power supply G+3.6V, and the other end of the chip capacitor CG5 is respectively connected to the module end reference ground MGND and the 9-pin GND2 port of the isolation capacitor;

[0017] Connect the chip capacitor CG6 in parallel between the 6-pin INC port of the isolation capacitor UG1 and the module reference ground MGND;

[0018] A chip capacitor CG7 is connected in parallel between the 7-pin OUTB port of the isolation capacitor UG1 and the module reference ground MGND, and a chip capacitor CG8 is connected in parallel between the 8-pin OUTA port of the isolation capacitor UG1 and the module reference ground MGND.

[0019] In the data receiving module, a transistor QG2 is included;

[0020] The emitter of transistor QG2 is connected to the 8-pin OUTA port of the isolation capacitor UG1, and the base is connected to the module-end signal power supply VDD_1V8 through the chip resistor RG4. The collector of transistor QG2 and the chip resistor RG5 and one end of the chip capacitor CG10 are connected to the module-end receiving signal GPRS_RXD, and the other end is connected to the module-end signal power supply VDD_1V8. The chip capacitor CG9 is connected in parallel across the chip resistor RG4.

[0021] In the communication control module, the chip resistor RG6 is included, one end of the chip resistor RG6 is connected to the 7-pin OUTB port of the isolation capacitor UG1, and the other end and one end of the chip resistor RG7 are connected to the base of the transistor QG1, the other end of the chip resistor RG7 and the emitter of QG1 and one end of the chip capacitor CG11 are connected to the module reference ground MGND, the collector of the transistor QG1 is connected to one end of the chip resistor RG8, and the other end of the chip resistor RG8 and the other end of the chip capacitor CG11 are connected to the module-end start control signal RESERVED.

[0022] In the data sending module, the chip resistor RG9 is included, one end of which and the collector of the transistor QG3 are connected to the 6-pin INC port of the isolation capacitor UG1, and the other end is connected to the module-end working power supply G+3.6V, the base of the transistor QG3 is connected to the module-end signal power supply VDD_1V8 through the chip resistor RG10, the chip capacitor CG12 is connected in parallel across the chip resistor RG10, the emitter of the transistor QG3 and one end of the chip capacitor CG13 are connected to the module-end sending signal GPRS_TXD, and the other end of CG13 is connected to the module reference ground MGND.

[0023] The module of the utility model is isolated from the system, is safe and reliable, has strong anti-interference ability, ensures high-quality communication, has a simple structure, low cost, fast response speed, and can work stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are only used to illustrate the technical solution of the present invention, rather than to limit it. Figure 1 As shown, a 3G module isolation communication system based on capacitive coupling in this embodiment,

[0026] The circuit designed this time includes chip resistors RG1-RG10, chip resistors CG1-CG13, transistors QG1-QG3 and isolation capacitor UG1. It is divided into four parts: isolation module, communication control module, data transmission module and data receiving module.

[0027] The composition of the isolation module is as follows: the communication transmission signal M_G_TXD output by the main system is connected to the 3-pin INA port of the isolation capacitor UG1, and the signal is connected to the main system power supply DVDD through the chip resistor RG1, and is connected to the main system reference ground GND through the chip capacitor CG2. The communication control signal M_RESERVED of the main system is connected to the 4-pin INB port of the isolation capacitor UG1, and the signal is connected to the main system power supply DVDD through the chip resistor RG2, and is connected to the main system reference ground GND through the chip capacitor CG3. The communication receiving signal M_G_RXD of the main system is connected to the 5-pin OUTC port of the isolation capacitor UG1, and the signal is connected to the main system power supply DVDD through the chip resistor RG3, and is connected to the main system reference ground GND through the chip capacitor CG4. One end of the chip capacitor CG1 is connected to the main system power supply DVDD and the 1-pin VDD1 port of the isolation capacitor UG1, and the other end is connected to the main system reference ground GND and the 2-pin GND1 port of the isolation capacitor. One end of the chip capacitor CG5 is connected to the module-side working power supply G+3.6V and the 10-pin VDD2 port of the isolation capacitor UG1, and the other end is connected to the module-side reference ground MGND and the 9-pin GND2 port of the isolation capacitor. The chip capacitor CG6 is connected in parallel between the 6-pin INC port of the isolation capacitor UG1 and the module reference ground MGND, the chip capacitor CG7 is connected in parallel between the 7-pin OUTB port of the isolation capacitor UG1 and the module reference ground MGND, and the chip capacitor CG8 is connected in parallel between the 8-pin OUTA port of the isolation capacitor UG1 and the module reference ground MGND.

[0028] The data receiving module is described as follows. The emitter of the transistor QG2 is connected to the 8-pin OUTA port of the isolation capacitor UG1, and the base is connected to the module-end signal power supply VDD_1V8 through the chip resistor RG4. The chip capacitor CG9 is connected in parallel across the chip resistor RG4. The collector and the chip resistor RG5, one end of the chip capacitor CG10 are connected to the module-end receiving signal GPRS_RXD, and the other end is connected to the module-end signal power supply VDD_1V8.

[0029] The communication control module is described as follows: one end of the chip resistor RG6 is connected to the 7-pin OUTB port of the isolation capacitor UG1, and the other end and one end of the chip resistor RG7 are connected to the base of the transistor QG1; the other end of the chip resistor RG7, the emitter of QG1 and one end of the chip capacitor CG11 are connected to the module reference ground MGND; the collector of the transistor QG1 is connected to one end of the chip resistor RG8, and the other end of RG8 and the other end of the chip capacitor CG11 are connected to the module-end start control signal RESERVED.

[0030] The data sending module is described as follows: one end of the chip resistor RG9 and the collector of the transistor QG3 are connected to the 6-pin INC port of the isolation capacitor UG1, and the other end is connected to the module-end working power supply G+3.6V. The base of the transistor QG3 is connected to the module-end signal power supply VDD_1V8 through the chip resistor RG10. The chip capacitor CG12 is connected in parallel across the chip resistor RG10. The emitter of the transistor QG3 and one end of the chip capacitor CG13 are connected to the module-end sending signal GPRS_TXD, and the other end of CG13 is connected to the module reference ground MGND.

[0031] In the communication control module, when the energy meter is powered on, the communication control signal M_RESERVED on the main system side is set to a high level through the main system power supply DVDD, and the 7-pin OUTB output of the isolation capacitor UG1 is a high-level signal. At this time, the transistor QG1 is turned on, and the start control signal RESERVED pulled up by the module end becomes a low level, and the module starts to run.

[0032] In the data receiving module, the communication sending signal M_G_TXD output by the main system end is set to a high level through the main system power supply DVDD. At this time, the module end receiving signal GPRS_RXD in the data receiving circuit is a high level. When the communication sending signal M_G_TXD becomes a low level, the module end receiving signal GPRS_RXD is a low level.

[0033] In the data sending module, the module-side sending signal GPRS_TXD is set to a high level through the module-side working power supply G+3.6V. At this time, the communication receiving signal M_G_RXD of the main system side is a high level. When the module-side sending signal GPRS_TXD outputs a low level, the system-side communication receiving signal M_G_RXD is a low level.

[0034] The main system end and the module end interact with each other through the isolation capacitor UG1, the communication control module, the data transmission circuit and the data receiving circuit. Among them, the chip capacitors CG1-CG13 play the role of energy storage and filtering.

Claims

1. A 3G module isolation communication system based on capacitive coupling, characterized in that: The system includes an isolation module and a communication control module which are electrically connected; the communication control module is electrically connected to a data sending module and a data receiving module respectively; The input terminal of the isolation module is used to electrically connect to the main system terminal; The communication control module is used for electrically connecting the module ends; The isolation module includes an isolation capacitor UG1; The communication transmission signal M_G_TXD outputted by the main system is connected to the 3-pin INA port of the isolation capacitor UG1; The communication control signal M_RESERVED of the main system is connected to the 4-pin INB port of the isolation capacitor UG1; The communication receiving signal M_G_RXD of the main system is connected to the 5-pin OUTC port of the isolation capacitor UG1.

2. A 3G module isolation communication system based on capacitive coupling according to claim 1, characterized in that: The INA port of the 3-pin of the isolation capacitor UG1 is connected to the main system power supply DVDD through the chip resistor RG1, and is connected to the main system reference ground GND through the chip capacitor CG2; The 4-pin INB port of the isolation capacitor UG1 is connected to the main system power supply DVDD through the chip resistor RG2, and is connected to the main system reference ground GND through the chip capacitor CG3; The 5-pin OUTC port of the isolation capacitor UG1 is connected to the main system power supply DVDD through the chip resistor RG3, and is connected to the main system reference ground GND through the chip capacitor CG4; The 1-pin VDD1 port of the isolation capacitor UG1 is connected to one end of the chip capacitor CG1, and one end of the chip capacitor CG1 is also connected to the main system power supply DVDD and the 1-pin VDD1 port of the isolation capacitor UG1. The other end of the chip capacitor CG1 is connected to the main system reference ground GND and the 2-pin GND1 port of the isolation capacitor UG1. The 10-pin VDD2 port of the isolation capacitor UG1 is electrically connected to the chip capacitor CG5, one end of the chip capacitor CG5 is connected to the module end working power supply G+3.6V, and the other end of the chip capacitor CG5 is respectively connected to the module end reference ground MGND and the 9-pin GND2 port of the isolation capacitor; Connect the chip capacitor CG6 in parallel between the 6-pin INC port of the isolation capacitor UG1 and the module reference ground MGND; A chip capacitor CG7 is connected in parallel between the 7-pin OUTB port of the isolation capacitor UG1 and the module reference ground MGND, and a chip capacitor CG8 is connected in parallel between the 8-pin OUTA port of the isolation capacitor UG1 and the module reference ground MGND.

3. A 3G module isolation communication system based on capacitive coupling according to claim 2, characterized in that: In the data receiving module, a transistor QG2 is included; The emitter of transistor QG2 is connected to the 8-pin OUTA port of the isolation capacitor UG1, and the base is connected to the module-end signal power supply VDD_1V8 through the chip resistor RG4. The collector of transistor QG2 and the chip resistor RG5 and one end of the chip capacitor CG10 are connected to the module-end receiving signal GPRS_RXD, and the other end is connected to the module-end signal power supply VDD_1V8. The chip capacitor CG9 is connected in parallel at both ends of the chip resistor RG4.

4. A 3G module isolation communication system based on capacitive coupling according to claim 3, characterized in that: In the communication control module, the chip resistor RG6 is included, one end of the chip resistor RG6 is connected to the 7-pin OUTB port of the isolation capacitor UG1, and the other end and one end of the chip resistor RG7 are connected to the base of the transistor QG1, the other end of the chip resistor RG7 and the emitter of QG1 and one end of the chip capacitor CG11 are connected to the module reference ground MGND, the collector of the transistor QG1 is connected to one end of the chip resistor RG8, and the other end of the chip resistor RG8 and the other end of the chip capacitor CG11 are connected to the module-end start control signal RESERVED.

5. A 3G module isolation communication system based on capacitive coupling according to claim 4, characterized in that: In the data sending module, the chip resistor RG9 is included, one end of which and the collector of the transistor QG3 are connected to the 6-pin INC port of the isolation capacitor UG1, and the other end is connected to the module-end working power supply G+3.6V, the base of the transistor QG3 is connected to the module-end signal power supply VDD_1V8 through the chip resistor RG10, the chip capacitor CG12 is connected in parallel across the chip resistor RG10, the emitter of the transistor QG3 and one end of the chip capacitor CG13 are connected to the module-end sending signal GPRS_TXD, and the other end of CG13 is connected to the module reference ground MGND.

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