Expansion module for matrix communication

Abstract

The utility model discloses an expansion module for matrix communication, which is an independent PCB (printed circuit board), and the board comprises an Internet of Things Bluetooth wireless communication chip, a filtering matching circuit, a quartz crystal and a plurality of surface-mounted resistor-capacitor elements. A PCB (Printed Circuit Board) of the expansion module is provided with a communication interface and an antenna terminal; the communication interface is directly connected to a serial communication port of the street lamp controller; the expansion module obtains the power supply voltage from the street lamp controller, and the power supply voltage range is 2.0-3.6 V. In the dormant state of the expansion module, the holding current is smaller than or equal to 0.4 uA, the working frequency band is 2.4 G, the transmitting power is smaller than or equal to 10 dBm, and when the transmission rate is larger than or equal to 1 Mbps, the receiving sensitivity is not lower than-97 dBm, and the point-to-point communication distance is larger than or equal to 150 m.

Description

Technical Field

[0001] The utility model relates to the technical field of street lamp control, in particular to an expansion module for matrix communication. Background Art

[0002] With the continuous development of urban road network construction, the number of street lamps has increased. Improving the intelligent management and functional diversity of street lamps has become a top priority in the construction of urban lighting systems. What wireless control solutions can be used in smart street lamps?

[0003] Traditional smart street light communication methods widely use power line carrier, zigbee or 2G, 4G communication methods. Among them, the control signals of power line carrier and zigbee communication methods need to be transferred in the concentrator of the distribution box before communicating with the background. Since the concentrator adopts a polling mechanism, it communicates with each smart street light one by one, which makes the inspection cycle long and the status feedback slow; and the control signal of the power line carrier is also susceptible to interference from other devices on the power line. In actual applications, when the power line is unloaded, the point-to-point carrier signal can be transmitted to several kilometers. But when the load on the power line is heavy, it can only be transmitted for tens of meters. The control signal of zigbee is susceptible to interference from other wireless signals, and the obstruction of buildings may also cause its communication to be unstable. In addition, each smart street light of 2G and 4G wireless communication methods contains a communication module and a sim card, so that the smart street light can communicate directly with the background wirelessly, but the communication method is based on the wireless public network with low security, and the communication coverage is low due to the restrictions of network operators, and it cannot be used globally. In addition, a large amount of operator fees will be generated every year, and the cost for smart street light controllers exceeds expectations.

[0004] Bluetooth low energy supports point-to-point topology and also allows devices to broadcast data, so that a device that broadcasts can communicate with many devices that listen to the broadcast, thereby supporting one-to-many device communication. In recent years, with the support of MESH networks, Bluetooth supports complex many-to-many communications, and any device in a MESH network can communicate with any other device in the same network. In addition, devices do not need to be within direct radio transmission range of each other. Messages can be relayed through the network in a series of jumps, so the network can cover a very wide physical area. The operating frequency band of Bluetooth technology is universal worldwide and suitable for unbounded use by users around the world. And all information in the network needs to be authenticated to prevent retransmission of information with serial numbers when it is sent. Bluetooth communication uses error detection and correction, data encoding and decoding, error control, data noise, etc. to improve the reliability of Bluetooth wireless transmission data. In addition, adaptive frequency hopping technology minimizes crosstalk with other 2.4G ISM band radio waves. Using a Bluetooth device, you can search for another Bluetooth technology product and quickly establish a connection between the two devices. Under the control of the control software, data can be automatically transmitted. The point-to-point communication distance reaches more than 100 meters, and the Bluetooth MESH networking function is combined with the Bluetooth gateway to form an IoT communication system with a wide coverage area. Utility Model Content

[0005] The utility model discloses an expansion module for matrix communication, wherein the expansion module is an independent PCB board, and the PCB board includes: an Internet of Things Bluetooth wireless communication chip, a filter matching circuit, a quartz crystal and a plurality of surface mount resistor and capacitor components; the PCB board of the expansion module is provided with a communication interface and an antenna terminal, and the communication interface is directly connected to the serial communication port of the street lamp controller;

[0006] The expansion module obtains a power supply voltage from the street light controller, and the power supply voltage ranges from 2.0 to 3.6V.

[0007] As described in the expansion module of the utility model, the maintenance current of the expansion module in the sleep state is less than or equal to 0.4uA, the operating frequency band is 2.4G, the transmission power is less than or equal to 10dBm, when the transmission rate is greater than or equal to 1Mbps, the receiving sensitivity is not worse than -97dBm, and the point-to-point communication distance is greater than or equal to 150 meters.

[0008] As for the expansion module described in the utility model, the Internet of Things Bluetooth wireless communication chip adopts PHY6212.

[0009] As described in the expansion module of the present invention, the filter matching circuit is a π-type filter, including a resistor and two filter capacitors, and the matching impedance of the π-type filter is 50 ohms; the two ends of the resistor are respectively connected to the RF input terminal and the antenna terminal of the Internet of Things Bluetooth wireless communication chip, the RF input terminal is connected to one end of the first filter capacitor, and the antenna terminal is connected to one end of the second filter capacitor, and the other ends of the first filter capacitor and the second filter capacitor are grounded to match the 50 ohm impedance.

[0010] In the expansion module of the present invention, the resistor and capacitor of the filter matching circuit are chip components.

[0011] As described in the expansion module of the utility model, the two ends of the quartz crystal are connected to the two oscillation terminals of the Internet of Things Bluetooth wireless communication chip.

[0012] As described in the expansion module of the present invention, the communication interface uses a direct-insertion DIP or a surface mount SMD, and the communication interface includes: a Bluetooth chip power supply terminal, a signal receiving terminal, a signal sending terminal and a ground terminal.

[0013] The advantages of the utility model are: the power supply voltage range of the matrix communication expansion module is 2.0-3.6V, the sleep current is as low as 0.4uA, the working frequency band is 2.4G, the transmission power is 10dBm, the receiving sensitivity is -97dBm (1Mbps), and the point-to-point communication distance can reach 150 meters. Bluetooth MESH is used to realize the intelligence of the traditional street light controller, realize the remote control, real-time control, single-point management, centralized management, and system monitoring and management system of the street light, realize easy management to avoid the busy inspection personnel and long inspection cycle, remote data collection and analysis, effectively solve the energy waste, fault alarm and avoid road safety hazards. It comprehensively improves management efficiency and greatly reduces operation and maintenance costs. In addition, Bluetooth MESH communication also reduces the cost of electronic components of the street light controller and improves communication reliability and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A circuit board diagram of the utility model;

[0015] Figure 2 The electrical schematic diagram of the Bluetooth communication module and its attached circuit elements of the utility model;

[0016] Figure 3 The electrical schematic diagram of the antenna interface and the filter matching circuit of the utility model.

[0017] Figure 4 The electrical principle diagram of the communication serial port of the utility model. DETAILED DESCRIPTION

[0018] The utility model provides an expansion module for Bluetooth matrix communication of a smart street light controller. On the basis of the traditional street light controller, there is no need to change the original circuit structure. The matrix expansion module communicates directly with the serial port reserved by the street light controller. Hundreds of ordinary street light controllers establish a matrix MESH network through matrix communication, and then use the Bluetooth gateway to remotely control the group or any street light controller in the single control group to remotely turn on and off the lights, send data, issue fault alarms, and upload real-time data to the big data platform for data analysis and calculation, thereby reducing the management and maintenance costs and network fee costs of the street light controller. At the same time, the matrix communication improves the communication reliability and security, and reduces the power consumption of the battery-powered street light controller.

[0019] The preferred embodiments of the present invention will be described in detail below in conjunction with the examples. It should be understood that the following examples are provided only for the purpose of illustration and are not intended to limit the scope of protection of the present invention. Those skilled in the art may make various modifications and substitutions to the present invention without departing from the purpose and spirit of the present invention, and all of these modifications and substitutions fall within the scope of protection claimed in the claims of the present invention.

[0020] Attached Figure 1 It is an electrical principle diagram of the utility model.

[0021] Example 1

[0022] The utility model discloses an expansion module for matrix communication, wherein the expansion module is an independent PCB board, and the PCB board includes: an Internet of Things Bluetooth wireless communication chip, a filter matching circuit, a quartz crystal and a plurality of surface mount resistor and capacitor components; the PCB board of the expansion module is provided with a communication interface and an antenna terminal, and the communication interface is directly connected to the serial communication port of the street lamp controller;

[0023] The expansion module obtains a power supply voltage from the street light controller, and the power supply voltage ranges from 2.0 to 3.6V.

[0024] As described in the expansion module of the utility model, the maintenance current of the expansion module in the sleep state is less than or equal to 0.4uA, the operating frequency band is 2.4G, the transmission power is less than or equal to 10dBm, when the transmission rate is greater than or equal to 1Mbps, the receiving sensitivity is not worse than -97dBm, and the point-to-point communication distance is greater than or equal to 150 meters.

[0025] As described in the expansion module of the utility model, the IoT Bluetooth wireless communication chip adopts PHY6212. The electrical schematic diagram is as shown in the attached Figure 2 Shown

[0026] The expansion module of the utility model can be welded to the existing solar street light controller through the reserved welding pad, and each controller is added with a matrix module. It acts on the self-organizing network communication system of the mesh network topology structure, thereby forming a solar street light controller with matrix function. The solar street light controller with the matrix module is called a node in the matrix. The communication distance between nodes can reach up to 150 meters.

[0027] The mobile terminal searches for nodes in the matrix through Bluetooth communication, adds the searched nodes to the established project, and controls the nodes in the project through the mobile terminal, including single control and group control. The communication path is mainly for the mobile terminal to send a message to the nearest node, and this node then sends the message to the nodes closer to it, and in turn, all nodes in the matrix can receive the message sent by the mobile terminal.

[0028] Under the control of the matrix gateway, the installation location and operating status of each device can be accurately grasped remotely through a personal computer. The messages sent between the matrix gateway and the nodes in the matrix are consistent with the messages sent between nodes. A 4G module is added to the matrix gateway, and the interaction with the cloud server is completed through 4G.

[0029] The IoT Bluetooth wireless communication chip of this utility model uses PHY6212 from Shanghai Fengjia Microelectronics. PHY6212 is an ultra-low power IoT Bluetooth wireless communication chip with a 32-bit Cortex TM -M0 CPU, equipped with 138KSRAM / Retention SRAM, has the characteristics of ultra-low power consumption, high performance and wireless multi-mode, supports BLE functions for security, application and wireless update, and realizes communication between matrix Bluetooth gateway and hundreds of solar Bluetooth street light controllers. The input and output interfaces and integrated applications of peripheral devices of the IoT Bluetooth wireless communication chip also bring low-cost advantages to customers. The expansion module has a power supply voltage range of 2.0-3.6V, a sleep current as low as 0.4uA, an operating frequency band of 2.4G, a transmission power of 10dBm, a receiving sensitivity of -97dBm (1Mbps), and a point-to-point communication distance of up to 150 meters.

[0030] As described in the expansion module of the utility model, the filter matching circuit is a π-type filter, as shown in the attached Figure 3 As shown, it includes a resistor and two filter capacitors, and the matching impedance of the π-type filter is 50 ohms; the two ends of the resistor are respectively connected to the RF input terminal and the antenna terminal of the Internet of Things Bluetooth wireless communication chip, the RF input terminal is connected to one end of the first filter capacitor, and the antenna terminal is connected to one end of the second filter capacitor, and the other ends of the first filter capacitor and the second filter capacitor are grounded to match the 50 ohm impedance.

[0031] In the expansion module of the present invention, the resistor and capacitor of the filter matching circuit are chip components.

[0032] As attached Figure 1 On the PCB board shown, X1 is a quartz crystal, X2 is an antenna, C1-C11 are capacitors, R is a resistor, and L is an inductor. All components are packaged in 0402. X7 is the power supply for the Bluetooth chip and the serial communication interface with the external traditional street light controller.

[0033] As described in the expansion module of the utility model, the two ends of the quartz crystal are connected to the two oscillation terminals of the Internet of Things Bluetooth wireless communication chip.

[0034] As described in the expansion module of the utility model, the communication interface uses a direct plug-in DIP or a surface mount SMD, and the communication interface includes: a Bluetooth chip power supply terminal, a signal receiving terminal, a signal sending terminal and a ground terminal. The electrical schematic diagram of the communication interface is shown in the attached Figure 4 .

[0035] In order to make the module smaller, the resistors and capacitors on the PCB are all packaged in 0402, and the size of the single board is 13.7mm*17mm. X7 is used to power the Bluetooth chip and communicate with the external traditional street light controller. The interface uses a half-hole process and can be used for direct insertion DIP or surface mount SMD. The power supply voltage of the module is 2.0-3.6V, and the sleep current is as low as 0.4uA. The working frequency band is 2.4G. R1, C4, and C5 form a π-type filter to match 50 ohm impedance. X2 is an omnidirectional 2.4G antenna with a transmission power of 10dBm and a receiving sensitivity of -97dBm (1Mbps). The point-to-point communication distance can reach 150 meters. The matrix communication module communicates the collected information with the MCU on the controller through the serial port, and finally realizes the mobile terminal or Bluetooth gateway to send or upload the controller parameters.

[0036] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. An expansion module for matrix communication, characterized in that: The expansion module is an independent PCB board, which includes: an IoT Bluetooth wireless communication chip, a filter matching circuit, a quartz crystal and a plurality of surface mount resistor and capacitor components; the PCB board of the expansion module is provided with a communication interface and an antenna terminal, and the communication interface is directly connected to the serial communication port of the street lamp controller; The expansion module obtains a power supply voltage from the street light controller, and the power supply voltage ranges from 2.0 to 3.6V.

2. The expansion module according to claim 1, characterized in that: The maintenance current of the expansion module in sleep state is less than or equal to 0.4uA, the operating frequency band is 2.4G, the transmission power is less than or equal to 10dBm, when the transmission rate is greater than or equal to 1Mbps, the receiving sensitivity is not worse than -97dBm, and the point-to-point communication distance is greater than or equal to 150 meters.

3. The expansion module according to claim 1, characterized in that: The Internet of Things Bluetooth wireless communication chip adopts PHY6212.

4. The expansion module according to claim 1, characterized in that: The filter matching circuit is a π-type filter, including a resistor and two filter capacitors, and the matching impedance of the π-type filter is 50 ohms; the two ends of the resistor are respectively connected to the RF input terminal and the antenna terminal of the Internet of Things Bluetooth wireless communication chip, the RF input terminal is connected to one end of the first filter capacitor, and the antenna terminal is connected to one end of the second filter capacitor, and the other ends of the first filter capacitor and the second filter capacitor are grounded to match the 50 ohm impedance.

5. The expansion module according to claim 1, characterized in that: The resistors and capacitors of the filter matching circuit are surface mount components.

6. The expansion module according to claim 1, characterized in that: The two ends of the quartz crystal are connected to two oscillation terminals of the Internet of Things Bluetooth wireless communication chip.

7. The expansion module according to claim 1, characterized in that: The communication interface uses a direct-insertion DIP or a surface mount SMD, and the communication interface includes: a Bluetooth chip power supply terminal, a signal receiving terminal, a signal sending terminal and a ground terminal.

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