Intelligent LoRa gateway device

Abstract

The utility model relates to the technical field of fire alarm, in particular to an intelligent LoRa gateway device, which can realize wireless communication and improve the applicability of products, and comprises a main control unit, a power supply conversion unit, a wireless LoRa module and an RS485 communication interface, the power supply conversion unit is used for converting an external input voltage into various working voltages required by an internal circuit; the RS485 communication interface is used for being in butt joint with a fire-fighting concentrator; the wireless LoRa module is used for receiving an alarm signal and transmitting the alarm signal to the main control unit; and the main control unit is used for controlling the whole system.

Description

Technical Field

[0001] This utility model relates to the field of fire alarm technology, specifically to an intelligent LoRa gateway device. Background Technology

[0002] Fire alarm systems are essential fire safety devices in small and medium-sized venues (shops, hotels, entertainment venues, retail and wholesale markets, warehouses, villas, etc.) and densely populated places. Traditional fire alarm signals are received via wired communication, which has certain requirements for the location and has a limited scope of application. Utility Model Content

[0003] To address the aforementioned technical problems, this invention provides an intelligent LoRa gateway device that enables wireless communication and improves product applicability.

[0004] The technical solution is as follows: an intelligent LoRa gateway device, characterized in that it includes a main control unit, a power conversion unit, a wireless LoRa module, and an RS485 communication interface;

[0005] The power conversion unit is used to convert the external input voltage into various operating voltages required by the internal circuit.

[0006] The RS485 communication interface is used to connect to the fire control center.

[0007] The wireless LoRa module is used to receive alarm signals and transmit them to the main control unit;

[0008] The main control unit includes controls for the entire system.

[0009] A further feature is that the main control unit includes an MCU chip U3 of model STC12C5A32S2, a data latch U4, and a RAM chip U5;

[0010] The RS485 communication interface includes an RS485 driver chip U6 of model number SN75176. Pin 1 of the RS485 driver chip U6 is connected to one end of resistor R5, and the other end of resistor R5 is connected to pin 5 of the MCU chip U3. Pins 2 and 3 of the RS485 driver chip U6 are connected to pin 2 of the MCU chip U3. Pin 4 of the RS485 driver chip U6 is connected to pin 7 of the MCU chip U3. Pin 6 of the RS485 driver chip U6 is connected to one end of resistor R3. The other end of resistor R3 is connected to one end of resistor R1 and the cathode of TVS diode D8, and is also a connection port A. Pin 7 of the RS485 driver chip U6 is connected to one end of resistor R4. The other end of resistor R4 is connected to one end of resistor R2 and the cathode of TVS diode D9, and is also a connection port B. The other end of resistor R1 is connected to a 5V power supply. The other end of resistor R2, the anode of TVS diode D8, and the anode of TVS diode D9 are all grounded.

[0011] The wireless LoRa module includes a Ra-02 wireless LoRa chip U7. Pin 12 of the wireless LoRa chip U7 is connected to the anode of diode D7, pin 13 is connected to the emitter of transistor Q1, pin 14 is connected to the anode of diode D6, and pin 15 is connected to the anode of diode D5. The cathode of diode D7 is connected to pin 6 of the MCU chip U3, the cathode of diode D6 is connected to pin 28 of the MCU chip U3, and the cathode of diode D5 is connected to pin 17 of the MCU chip U3. The base of transistor Q1 is connected to one end of resistor R7 and one end of capacitor C4. The other ends of resistor R7 and capacitor C4 are both connected to a 3.3V power supply. The collector of transistor Q1 is connected to one end of resistor R8 and pin 39 of MCU chip U3. The other end of resistor R8 is connected to a 5V power supply. Pin 4 of wireless LoRa chip U7 is connected to the collector of transistor Q2 and one end of capacitor C5. The base of diode Q2 is connected to one end of resistor R9 and one end of resistor R10. The other end of resistor R9 is connected to pin 11 of MCU chip U3. The other end of resistor R10 is connected to the emitter of transistor Q2, the other end of capacitor C5, and grounded.

[0012] The power conversion unit includes a DC / DC power chip U1 (model LM2576-5.0) and an LDO power chip U2 (model SPX1117-3.3). Pin 1 of the DC / DC power chip U1 is connected to one end of capacitor C1, one end of capacitor E1, the cathode of diode D2, and one end of fuse F1. The other end of fuse F1 is connected to the cathode of diode D1. The anode of diode D1 is connected to a 24V power supply. Pin 2 of the DC / DC power chip U1 is connected to one end of inductor L3 and the cathode of diode D3. The other end of inductor L3 is connected to one end of capacitor C2 and one end of capacitor E2. The LDO power chip U1 is connected to the cathode of the TVS diode D4, pin 3 of the LDO power chip U2, and pin 4 of the DC / DC power chip U1 to output 5V. Pins 2 and 4 of the LDO power chip U2 can be connected to one end of capacitor C3 and one end of capacitor E3 to output 3.3V. The anode of diode D2, the other end of capacitor E1, the other end of capacitor C1, pins 3 and 5 of DC / DC power chip U1, the anode of diode D3, the other end of capacitor E2, the other end of capacitor C2, the anode of diode D3, the other end of capacitor E3, the other end of capacitor C3, and pin 1 of LDO power chip U1 are all grounded.

[0013] By adopting this utility model, wireless communication is achieved through a network of wireless terminal devices (such as wireless detectors, wireless manual fire alarm buttons, wireless audible and visual alarms, etc.) via LoRa wireless communication. The alarm signals output by devices such as wireless detectors and wireless manual fire alarm buttons are received and then transmitted to the fire protection cloud platform via an RS485 communication interface. The wireless communication method has low site requirements and improves the applicability of the product. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the principle of this utility model;

[0015] Figure 2 The schematic diagram of the main control unit circuit;

[0016] Figure 3 This is the schematic diagram of the RS485 communication interface circuit.

[0017] Figure 4 This is a schematic diagram of a wireless LoRa module circuit.

[0018] Figure 5 This is the circuit schematic of the power conversion unit;

[0019] Figure 6 The flowchart of the main control program module;

[0020] Figure 7 Flowchart for initializing the module;

[0021] Figure 8Flowchart for the communication module with wireless terminal equipment;

[0022] Figure 9 Flowchart for communication module with fire control center. Detailed Implementation

[0023] See Figures 1 to 5 As shown, an intelligent LoRa gateway device includes a main control unit, a power conversion unit, a wireless LoRa module, and an RS485 communication interface.

[0024] The main control unit is used for the control of the entire system. The main control unit includes an STC12C5A32S2 MCU chip U3, a HY62256 data latch U4, and a 74HC373 RAM chip U5, which meet the storage requirements of gateway communication data.

[0025] The RS485 communication interface is used to connect to the fire alarm control unit. It is implemented using the RS485 driver chip U6, model SN75176. The interface is equipped with a TVS diode and a current-limiting resistor to reduce interference from surges and short circuits. Pin 1 of the RS485 driver chip U6 is connected to one end of resistor R5. The other end of resistor R5 is connected to pin 5 of MCU chip U3. Pins 2 and 3 of the RS485 driver chip U6 are connected to pin 2 of MCU chip U3. Pin 4 of the RS485 driver chip U6 is connected to pin 7 of MCU chip U3. Pin 6 of the RS485 driver chip U6 is connected to one end of resistor R3. The other end of resistor R3 is connected to one end of resistor R1 and the cathode of diode D8, which is also the connection port A. Pin 7 of the RS485 driver chip U6 is connected to one end of resistor R4. The other end of resistor R4 is connected to one end of resistor R2 and the cathode of diode D9, which is also the connection port B. The other end of resistor R1 is connected to a 5V power supply. The other end of resistor R2, the anode of diode D8, and the anode of diode D9 are all grounded.

[0026] The wireless LoRa module is used to receive alarm signals and transmit them to the main control unit. The wireless LoRa module includes a Ra-02 wireless LoRa chip U7. Pin 12 of the wireless LoRa chip U7 is connected to the anode of diode D7, pin 13 is connected to the emitter of transistor Q1, pin 14 is connected to the anode of diode D6, and pin 15 is connected to the anode of diode D5. The cathode of diode D7 is connected to pin 6 of MCU chip U3, the cathode of diode D6 is connected to pin 28 of MCU chip U3, and the cathode of diode D5 is connected to pin 17 of MCU chip U3. The base of transistor Q1 is connected to one end of resistor R7 and one end of capacitor C4, and the other end of resistor R7 and capacitor C4 are connected to... One end is connected to a 3.3V power supply. The collector of transistor Q1 is connected to one end of resistor R8 and pin 39 of MCU chip U3, and the other end of resistor R8 is connected to a 5V power supply. Pin 4 of wireless LoRa chip U7 is connected to the collector of transistor Q2 and one end of capacitor C5. The base of diode Q2 is connected to one end of resistor R9 and one end of resistor R10. The other end of resistor R9 is connected to pin 11 of MCU chip U3, and the other end of resistor R10 is connected to the emitter of transistor Q2, the other end of capacitor C5, and grounded. Transistor Q2 controls the LoRa module reset pin, realizing the MCU chip's reset control of the wireless LoRa module. Transistor Q1 and diodes D5~D7 are connected to the SPI communication interface pins of the MCU chip and the wireless LoRa module to achieve interface level matching.

[0027] The power conversion unit converts external input voltage into various operating voltages required by the internal circuitry. The power conversion unit includes a DC / DC power chip U1 (model LM2576-5.0) and an LDO power chip U2 (model AMS1117-3.3). Pin 1 of the DC / DC power chip U1 is connected to one end of capacitor C1, one end of capacitor E1, the cathode of diode D2, and one end of fuse F1. The other end of fuse F1 is connected to the cathode of diode D1. The anode of diode D1 is connected to a 24V power supply. Pin 2 of the DC / DC power chip U1 is connected to one end of inductor L3 and the cathode of diode D3. The other end of inductor L3... Connect one end of capacitor C2, one end of capacitor E2, the cathode of TVS diode D4, pin 3 of LDO power chip U2, and pin 4 of DC / DC power chip U1 to output 5V. Connecting pins 2 and 4 of LDO power chip U2 allows connection to one end of capacitor C3 and one end of capacitor E3 to output 3.3V. The anode of diode D2, the other end of capacitor E1, the other end of capacitor C1, pins 3 and 5 of DC / DC power chip U1, the anode of diode D3, the other end of capacitor E2, the other end of capacitor C2, the anode of diode D3, the other end of capacitor E3, the other end of capacitor C3, and pin 1 of LDO power chip U1 are all grounded. First, the DC / DC power chip converts the externally input 24VDC voltage to 5VDC to supply the main control circuit and RS485 communication interface circuit. Then, the LDO power chip further converts the 5VDC voltage to 3.3VDC to supply the wireless LoRa module.

[0028] The main control unit is software controlled and mainly consists of a main control program module, an initialization module, a communication module with wireless terminal equipment, and a communication module with the fire-fighting central unit.

[0029] See Figure 6 As shown, the main tasks are to complete power-on initialization, receive alarm signals from wireless terminal devices via the communication module, convert them into corresponding device status values, and save them. Then, it calls the communication module with the fire control center to respond to queries about device status sent by the fire control center.

[0030] See Figure 7 As shown, the initialization module's main task is to initialize the device after power-on and reset. This mainly includes settings for the serial port, wireless LoRa communication, timers, and interrupts.

[0031] See Figure 8 As shown, the main task of the communication module with the wireless terminal device is to receive alarm data from the wireless terminal device through the wireless LoRa communication interface, and to verify and judge the data. If the data is valid, the module updates and saves the status data of the wireless terminal device according to the device address.

[0032] See Figure 9 As shown, the main task of the communication module with the fire control center is to receive the wireless terminal device status reading command sent by the fire control center through the RS485 communication interface, and return the corresponding device status data as a response to the fire control center.

Claims

1. An intelligent LoRa gateway device, characterized in that, It includes a main control unit, a power conversion unit, a wireless LoRa module, and an RS485 communication interface; The power conversion unit is used to convert the external input voltage into various operating voltages required by the internal circuit. The RS485 communication interface is used to connect to the fire control center. The wireless LoRa module is used to receive alarm signals and transmit them to the main control unit; The main control unit includes controls for the entire system.

2. The intelligent LoRa gateway device according to claim 1, characterized in that, The main control unit includes an MCU chip U3 (model STC12C5A32S2), a data latch U4, and a RAM chip U5.

3. The intelligent LoRa gateway device according to claim 2, characterized in that, The RS485 communication interface includes an RS485 driver chip U6 of model number SN75176. Pin 1 of the RS485 driver chip U6 is connected to one end of resistor R5, and the other end of resistor R5 is connected to pin 5 of the MCU chip U3. Pins 2 and 3 of the RS485 driver chip U6 are connected to pin 2 of the MCU chip U3. Pin 4 of the RS485 driver chip U6 is connected to pin 7 of the MCU chip U3. Pin 6 of the RS485 driver chip U6 is connected to one end of resistor R3. The other end of resistor R3 is connected to one end of resistor R1 and the cathode of TVS diode D8, which is also a connection port A. Pin 7 of the RS485 driver chip U6 is connected to one end of resistor R4. The other end of resistor R4 is connected to one end of resistor R2 and the cathode of TVS diode D9, which is also a connection port B. The other end of resistor R1 is connected to a 5V power supply. The other end of resistor R2, the anode of TVS diode D8, and the anode of TVS diode D9 are all grounded.

4. The intelligent LoRa gateway device according to claim 2, characterized in that, The wireless LoRa module includes a Ra-02 wireless LoRa chip U7. Pin 12 of the wireless LoRa chip U7 is connected to the anode of diode D7, pin 13 is connected to the emitter of transistor Q1, pin 14 is connected to the anode of diode D6, and pin 15 is connected to the anode of diode D5. The cathode of diode D7 is connected to pin 6 of the MCU chip U3, the cathode of diode D6 is connected to pin 28 of the MCU chip U3, and the cathode of diode D5 is connected to pin 17 of the MCU chip U3. The base of transistor Q1 is connected to one end of resistor R7 and one end of capacitor C4. The other ends of resistor R7 and capacitor C4 are both connected to a 3.3V power supply. The collector of transistor Q1 is connected to one end of resistor R8 and pin 39 of MCU chip U3. The other end of resistor R8 is connected to a 5V power supply. Pin 4 of wireless LoRa chip U7 is connected to the collector of transistor Q2 and one end of capacitor C5. The base of diode Q2 is connected to one end of resistor R9 and one end of resistor R10. The other end of resistor R9 is connected to pin 11 of MCU chip U3. The other end of resistor R10 is connected to the emitter of transistor Q2, the other end of capacitor C5, and grounded.

5. The intelligent LoRa gateway device according to claim 2, characterized in that, The power conversion unit includes a DC / DC power chip U1 (model LM2576-5.0) and an LDO power chip U2 (model SPX1117-3.3). Pin 1 of the DC / DC power chip U1 is connected to one end of capacitor C1, one end of capacitor E1, the cathode of diode D2, and one end of fuse F1. The other end of fuse F1 is connected to the cathode of diode D1. The anode of diode D1 is connected to a 24V power supply. Pin 2 of the DC / DC power chip U1 is connected to one end of inductor L3 and the cathode of diode D3. The other end of inductor L3 is connected to one end of capacitor C2 and one end of capacitor E2. The LDO power chip U1 is connected to the cathode of the TVS diode D4, pin 3 of the LDO power chip U2, and pin 4 of the DC / DC power chip U1 to output 5V. Pins 2 and 4 of the LDO power chip U2 can be connected to one end of capacitor C3 and one end of capacitor E3 to output 3.3V. The anode of the diode D2, the other end of capacitor E1, the other end of capacitor C1, pins 3 and 5 of the DC / DC power chip U1, the anode of the diode D3, the other end of capacitor E2, the other end of capacitor C2, the anode of the TVS diode D4, the other end of capacitor E3, the other end of capacitor C3, and pin 1 of the LDO power chip U1 are all grounded.

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