CN108337779A - A kind of wireless single lamp control system based on LoRa technologies - Google Patents

Abstract

The invention discloses a wireless single-lamp control system based on LoRa technology, including a system host, a LoRa wireless coordinator and a LoRa wireless single-lamp controller, the system host and the LoRa wireless coordinator communicate serially through a bus, and the LoRa wireless coordinator communicates with the LoRa wireless coordinator The LoRa wireless single light controller is connected through a wireless network, and the LoRa wireless single light controller is connected with external lights. The invention centrally controls the external adjustable lamps through the system host, LoRa wireless coordinator and LoRa wireless single lamp controller, can automatically detect and locate the faults of the adjustable lamps, and ensures centralized control while having low power consumption. advantage.

Description

A wireless single lamp control system based on LoRa technology

technical field

The invention relates to the field of lighting control, in particular to a wireless single lamp control system based on LoRa technology.

Background technique

With the rapid development of my country's expressways and the acceleration of urban construction, tunnel lighting and urban road lighting have increased rapidly, and the number of required lighting fixtures has increased sharply, becoming the most important source of energy consumption in the transportation field and urban public utilities. The existing traditional tunnel lighting and urban road lighting control systems all install lamps in groups and sections, and there are sub-loop control methods and group-level wired dimming control methods. The sub-circuit control method does not dim each lamp, but only controls the power on and off of a certain circuit in each group; the group-level wired dimming control method uses a dimming control signal cable to connect a group of lamp control signals, and a group of lamps are adjusted at the same time. brightness. These control methods require the laying of dimming control cables, laying more independent lighting circuits and power supply cables, and the construction is difficult. Especially in tunnel lighting, it is difficult to achieve smooth control of tunnel brightness due to the use of circuit on-off and group dimming. In addition, there is no way to detect and diagnose lamp failures in time, and it is impossible to locate faulty lamps. Manual inspection is required to determine lamp faults and lamp locations. Tunnel lighting maintenance is very difficult. Convenient, when there are many damaged lamps, it is easy to affect driving safety, and when a lamp is short-circuited at the dimming signal input end, all the lamps on the same group of dimming cables will be abnormal, that is, they cannot be dimmed, and thus lose dimming function, seriously affecting tunnel driving safety, road safety of people and vehicles, or causing huge waste of electric energy.

In recent years, with the development of Internet of Things technology, many wireless terminal controllers with characteristics of short distance, low data rate and low power consumption have been applied in the field of road lighting. However, compared with highway lighting, the environment inside the tunnel is relatively harsh, the number of lamps is relatively dense, and there are many extra-long tunnels. The existing wireless terminal controllers with simple functions and a single communication method have increasingly prominent contradictions between long-distance and low power consumption, and this type of wireless terminal controller does not have the function of automatic detection and positioning of lamp failures, so it is no longer suitable for tunnel lighting. With the development of urban roads, it is difficult to meet the requirements of smart lighting for urban roads and internal areas of enterprises.

Contents of the invention

The purpose of the present invention is to provide a LoRa wireless single lamp control system to solve the technical defects existing in the prior art.

In order to achieve the above object, the present invention provides a wireless single lamp control system based on LoRa technology, including a system host, a LoRa wireless coordinator and a LoRa wireless single lamp controller. The system host and the LoRa wireless coordinator communicate serially through a bus. LoRa wireless coordinator and LoRa wireless single light controller are connected through wireless network, and LoRa wireless single light controller is connected with external lights.

Preferably, a LoRa wireless single lamp control system includes a power supply module, a LoRa wireless module, a single-chip microcomputer, a dimming module, a relay module and a current acquisition module, and the power supply module is connected with the LoRa wireless module, the dimming module, the relay module and the single-chip microcomputer respectively To provide power, the single chip microcomputer is respectively connected with the relay module, the current collection module and the dimming module, and the dimming module and the current collection module are connected with the external lamps.

Preferably, the power module includes a 220V to 12V power module and a 12V to 3.3V power module, the 220V to 12V power module is connected to the 12V to 3.3V power module and the relay module, and the 12V to 3.3V power module is connected to the single chip microcomputer, the dimming module and the LoRa Wireless module connection.

Preferably, the dimming module includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a fuse F1, a diode D1, a diode D2, a transistor Q1, a Zener diode U1 and an operational amplifier chip U2, One end of the resistor R1 is used as the PWM signal input end, and the other end is connected to the base of the transistor Q1; the collector of the transistor Q1 is connected to one end of the resistor R2, one end of the R3, and the negative electrode of the Zener diode, and the other end of the resistor R2 is connected to the 3.3V power supply. The other end of the resistor R3 is connected to one end of the capacitor C1 and the first pin of the operational amplifier chip U2, the emitter of the transistor Q1 is connected to the positive electrode of the Zener diode U1, the other end of the capacitor C1, one end of the resistor R5, and one end of the capacitor C2 And the second pin of the operational amplifier chip U2 is connected and grounded; the other end of the capacitor C2 is connected to the second pin of the operational amplifier chip U2 and connected to the 12V power supply; the other end of the resistor R5 is connected to one end of the resistor R4 and the operational amplifier chip U2 The other end of the resistor R4 is connected to the fourth pin of the operational amplifier chip U2, one end of the fuse F1, the cathode of the diode D1, and the anode of the diode D2; the anode of the diode D1 is connected to the ground, and the cathode of the diode D2 is connected to 12V Power supply, the other end of the fuse F1 is used as the signal output end.

Preferably, the current collection module includes a current transformer H1, a resistor R6, a resistor R7, a resistor R8, a diode D3, a diode D4, and a capacitor C3, the first pin of the current transformer H1 is used as the input terminal of the live wire of the power supply, and the third pin is used as the power supply The output end of the live wire, one end of the resistor R6 is connected to the second leg of the current transformer H1, one end of the capacitor C3, the cathode of the diode D3, and the anode of the diode D4 and connected to the microcontroller, and the other end is connected to the fourth leg of the current transformer H1 , the other end of the capacitor C3, the positive pole of the diode D3, the negative pole of the diode D4, one end of the resistor R7 and one end of the resistor R8; the other end of the resistor R7 is grounded; the other end of the resistor R8 is connected to the 3.3V power supply.

The present invention has the following beneficial effects:

1. The present invention centrally controls the adjustable lamps through the system host, LoRa wireless coordinator and LoRa wireless single lamp controller, which can automatically detect and locate the faults of the adjustable lamps, and ensure centralized control while having low power consumption The advantages.

2. A DA dimming module with simple structure and practical application is designed in the LoRa wireless single-lamp controller of the present invention. The circuit design of this module does not require a special digital-analog chip, which greatly saves the cost of manufacture.

3. The circuit of the current acquisition module designed in the LoRa wireless single-lamp controller of the present invention does not need to add a voltage amplifier, and does not need other additional chips to improve the acquisition accuracy. It is low in cost, simple in structure and practical, and has high economic benefits. The present invention will be described in further detail below with reference to the accompanying drawings.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is a kind of LoRa wireless single lamp control system mechanism diagram of preferred embodiment of the present invention;

Fig. 2 is the structural diagram of the LoRa wireless single lamp controller system of the preferred embodiment of the present invention

Fig. 3 is a block diagram of a dimming module circuit in a preferred embodiment of the present invention;

Fig. 4 is a circuit block diagram of a current collection and lamp power output module in a preferred embodiment of the present invention;

Fig. 5 is an implementation diagram of the function and software flow of the single lamp controller in the preferred embodiment of the present invention.

In the figure, 1. System host; 2. LoRa wireless coordinator; 3. LoRa wireless single light controller; 311, 220V to 12V power supply module; 312, 12V to 3.3V power supply module; 32. LoRa wireless module; 33. Single chip microcomputer ; 34. Dimming module; 35. Relay module; 36. Current collection module.

Detailed ways

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.

In order to achieve the above object, the present invention provides a wireless single lamp control system based on LoRa technology, see Fig. 1, including system host 1, LoRa wireless coordinator 2 and LoRa wireless single lamp controller 3, system host 1 and LoRa wireless The coordinator 2 communicates serially through the bus, the LoRa wireless coordinator 2 and the LoRa wireless single-light controller 3 are connected through a wireless network, and the LoRa wireless single-light controller 3 is connected to external lamps.

The system host 1 can use a programmable logic controller PLC or an industrial control computer. The built-in bus interface module of the host is connected to the built-in bus conversion interface module of the LoRa wireless coordinator 2 through the 485 bus, CAN bus or PROFIBUS bus, and the host and LoRa wirelessly coordinate The device 2 realizes the bus type serial communication, and the communication is initiated by the host computer. LoRa wireless coordinator 2 initiates LoRa wireless communication after receiving the command from the host, and sends the command sent by the host to the LoRa wireless dimmable single-lamp controller that has successfully networked into the system, and then accepts the single-lamp controller to return through LoRa wireless communication The fault status information of the lamps and lanterns is uploaded to the system host 1 through bus communication. The LoRa wireless single light controller 3 communicates with the LoRa wireless coordinator 2 through the LoRa wireless communication method. After receiving the control command sent by the LoRa wireless coordinator 2, it analyzes and processes the data. According to the command analysis result, it can carry out its own network respectively. Parameter configuration and modification, dimming control or power switch control of the connected LED lamps; if the command is to read lamp fault status information, then return the corresponding lamp fault status value and fault location data to the coordinator. LoRa wireless single lamp controller 3 regularly collects lamp fault information through the current sensor. Fault location data is automatically generated by the single lamp controller.

The LoRa wireless single lamp control system based on the LoRa wireless single lamp controller 3 of the present invention, the LoRa wireless coordinator 2, and the system host 1 are constituted. The system is applied to lighting in tunnels, urban roads or enterprise areas to form a wireless lighting local area network at the tunnel management office or road management office or enterprise lighting level. Through Internet networking, a larger lighting monitoring system can be formed, such as provincial and municipal Expressway tunnel lighting intelligent monitoring system, etc.

Preferably, referring to Fig. 2, the LoRa wireless single lamp controller 3 includes a power supply module, a LoRa wireless module 32, a single-chip microcomputer 33, a dimming module 34, a relay module 35 and a current acquisition module 36, and the power supply module is respectively connected to the LoRa wireless module 32, the adjusting Optical module 34, relay module 35 and single-chip microcomputer 33 are connected to provide power, single-chip microcomputer 33 is connected with relay module 35, current acquisition module 36 and DA dimming module 34 respectively, dimming module 34 and current acquisition module 36 are connected with external lamps.

The single-chip microcomputer 33 controls the LoRa wireless module 32, and transmits or receives wireless signals through a 433MHz antenna to realize wireless communication. The antenna should be exposed outside the housing of the dimmable single lamp controller, so as not to affect the communication distance and transmission effect. After the single-chip microcomputer 33 receives the LoRa wireless dimming communication command, it outputs a PWM signal with an adjustable duty ratio to the DA dimming module 34, and the DA dimming module 34 converts the PWM signal into a 0-10VDC dimming control signal and outputs it to the The power supply control module of the lamp, the power control module automatically adjusts the illumination brightness of the lamp to realize dimming according to the dimming signal. After receiving the LoRa wireless relay switch control signal communication command, the single-chip microcomputer 33 controls the on-off of the relay to realize the on-off control of the lamp power supply, that is, controls the power on and off of the lamp power supply. The working power of LoRa wireless single lamp controller 3 and lamps is connected to the 220VAC power input port of the single lamp controller. The LoRa wireless dimmable single lamp controller has two outputs, one is the 0-10VDC or PWM dimming signal of the lamp, and the other is the 220VAC lamp power supply. These two outputs are connected to the corresponding input of the lamp, and the LoRa wireless dimmable single lamp controller can realize the dimming and power on-off control of the lamp respectively. The power input terminal of the dimmable lamp power supply control module is connected to the 220V output terminal of the LORA wireless dimmable single lamp controller to generate lamp power, and the working current of the lamp is collected by the current acquisition module of the LORA wireless dimmable single lamp controller 36 detection; the dimming input terminal of the dimmable lamp power control module is connected with the output terminal 34 of the DA dimming module of the LORA wireless dimmable single lamp controller to obtain a 0-10V dimming control signal. If the dimming control signal required by the lamp is a PWM signal, the single-chip microcomputer 33 directly outputs the PWM signal without passing through the DA dimming module 34 .

Preferably, the power module includes 220V to 12V power module 311 and 12V to 3.3V power module 312, 220V to 12V power module 311 is connected to 12V to 3.3V power module 312 and relay module 35, and 12V to 3.3V power module 312 is connected to the microcontroller 33. The dimming module 34 and the LoRa wireless module 32 are connected.

The AC 220V mains is connected to the power input terminal of the LORA wireless dimmable single lamp controller, and the internal 220V to 12V power supply module 311 outputs DC 12V power supply; the DC 12V power supply directly supplies power to the relay coil, and at the same time, 12V to 3.3V The power supply module 312 outputs a DC 3.3V power supply, and provides 3.3V power supply to the single-chip microcomputer 33 and the LoRa wireless module 32.

Preferably, the dimming module 34 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a fuse F1, a diode D1, a diode D2, a transistor Q1, a Zener diode U1 and an operational amplifier chip U2 One end of the resistor R1 is used as the PWM signal input end, and the other end is connected to the base of the transistor Q1; the collector of the transistor Q1 is connected to one end of the resistor R2, one end of R3 and the negative pole of the Zener diode, and the other end of the resistor R2 is connected to the 3.3V power supply , the other end of the resistor R3 is connected to one end of the capacitor C1 and the first pin of the operational amplifier chip U2, the emitter of the transistor Q1 is connected to the positive electrode of the Zener diode U1, the other end of the capacitor C1, one end of the resistor R5, and the capacitor C2 One end and the second pin of the op amp chip U2 are connected and grounded; the other end of the capacitor C2 is connected to the second pin of the op amp chip U2 and connected to a 12V power supply; the other end of the resistor R5 is connected to one end of the resistor R4 and the op amp chip The third pin of U2 is connected, the other end of the resistor R4 is connected to the fourth pin of the operational amplifier chip U2, one end of the fuse F1, the cathode of the diode D1, and the anode of the diode D2; the anode of the diode D1 is connected to the ground, and the cathode of the diode D2 is connected 12V power supply, the other end of the fuse F1 is used as the signal output end.

Figure 3 shows the specific design circuit of the DA dimming module 34 in the LoRa wireless single lamp controller 3, which realizes the conversion of the PWM dimming signal with a duty cycle of 0-100% to a 0-10V DC dimming signal: 33 outputs PWM signal; transistor Q1, resistors R2, R3, and capacitor C1 convert the PWM waveform output by Q1 with an amplitude of 3.3V and a duty cycle of 0-100% into a PWM waveform at both ends of C1 that changes with the duty cycle of the PWM waveform. It is a DC voltage waveform of 2.5-0V, and the DC voltage waveform is amplified by an LM321 operational amplifier circuit to output a DC dimming voltage V _OUT whose amplitude varies within the range of 0-10V.

Preferably, referring to FIG. 4, the current acquisition module 36 includes a current transformer H1, a resistor R6, a resistor R7, a resistor R8, a diode D3, a diode D4, and a capacitor C3. The first pin of the current transformer H1 is used as the input end of the power live wire, The third pin is used as the output end of the power live wire, one end of the resistor R6 is connected to the second pin of the current transformer H1, one end of the capacitor C3, the negative pole of the diode D3, and the positive pole of the diode D4 and connected to the microcontroller 33, and the other end is connected to the current mutual inductor The fourth pin of the device H1, the other end of the capacitor C3, the positive pole of the diode D3, the negative pole of the diode D4, one end of the resistor R7 and one end of the resistor R8; the other end of the resistor R7 is grounded; the other end of the resistor R8 is connected to the 3.3V power supply connect.

Use the normally closed contact of the relay HF32F to connect the 220V input live wire 220V-L, connect the source terminal 1 of the current transformer (DL-CT21C0.2) to the normally closed contact of the relay (220V-L1) and the source of the current transformer The side terminal 3 is connected in series with the live wire (220V-L2) of the power supply control module of the lamp, and the zero wire of the 220V power supply is output to the lamp through the lamp power output terminal of the single lamp controller to supply power to the lamp. The on-off of the relay coil current is controlled by the single-chip microcomputer in Figure 3 to realize the disconnection and connection of the power supply of the lamp. When the relay is powered off, the lamp current flows through the source side of the current transformer, and a corresponding current is generated on the secondary side of the current transformer, that is, terminals 2 and 4. The turns ratio of the current transformer is 1:200 (source side: secondary side); a 510-ohm sampling resistor R6 is connected in parallel with the secondary side terminals 2 and 4 of the current transformer to convert the current signal into a voltage signal; through two Diodes D4 and D3 are connected in anti-parallel to limit the voltage signal, which is output by terminal PC4.

Referring to Figure 5, the software function control of the LoRa wireless single lamp controller 3 includes the following steps:

Step 1: After the LoRa wireless dimmable single lamp controller receives the wireless command information sent by the LoRa wireless coordinator 2 that is consistent with its own network number, it first judges whether the command is a command to read the fault status of the lamp, and if so, it starts ADC samples, and runs the fault judgment program to judge the lamp fault. Then return the lamp failure status information to the network LoRa wireless coordinator 2. If there is a lamp failure, it will automatically return the location information of the faulty lamp.

Step 2: If it is not the command to read the lamp fault status, then judge whether the command is a lamp dimming command, if yes, the LoRa wireless dimmable single lamp controller outputs the dimming of the LED lamp connected to it through the DA dimming module 34 The control signal is used for smooth dimming, and the required dimming value can be adjusted within 3 seconds.

Step 3: If it is not a dimming command for the lamp, determine whether the command is a power switch control command for the lamp, and if so, the relay module 35 makes a corresponding action to control the power of the lamp to be turned on or off.

Step 4: If it is not a command to control the power switch of the lamp, judge whether it is a command to modify the node network parameters. If so, the LoRa wireless dimmable single lamp controller modifies its own network parameters online, and automatically restarts after the modification is completed.

Step 5: If it is not the command to modify the node network parameters, the LoRa wireless dimmable single lamp controller will switch to the wireless receiving mode and wait for the arrival of new wireless information.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (5)

1. A wireless single lamp control system based on LoRa technology, characterized in that it includes a system host (1), a LoRa wireless coordinator (2) and a LoRa wireless single lamp controller (3), the system host (1) Serial communication with the LoRa wireless coordinator (2) through the bus, the LoRa wireless coordinator (2) and the LoRa wireless single light controller (3) are connected through a wireless network, and the LoRa wireless single light controller (3) Connect with external lighting. 2. A wireless single-lamp control system based on LoRa technology according to claim 1, wherein the LoRa wireless single-lamp controller (3) includes a power module, a LoRa wireless module (32), a single-chip microcomputer (33 ), a dimming module (34), a relay module (35) and a current acquisition module (36), and the power supply module is connected to the LoRa wireless module (32), the dimming module (34), and the relay module respectively (35) and the single-chip microcomputer (33) are connected to provide power, and the single-chip microcomputer (33) is respectively connected to the relay module (35), the current collection module (36) and the dimming module (34), The dimming module (34) and the current collection module (36) are connected to external lamps. 3. A wireless single lamp control system based on LoRa technology according to claim 2, characterized in that the power module includes a 220V to 12V power module (311) and a 12V to 3.3V power module (312), the The 220V to 12V power supply module (311) is connected to the 12V to 3.3V power supply module (312) and the relay module (35), and the 12V to 3.3V power supply module (312) is connected to the single chip microcomputer (33), The dimming module (34) is connected with the LoRa wireless module (32). 4. A wireless single-lamp control system based on LoRa technology according to claim 2, characterized in that the dimming module (34) includes resistors R1, R2, R3, R4, R5, capacitors Composed of C1, capacitor C2, fuse F1, diode D1, diode D2, transistor Q1, Zener diode U1 and operational amplifier chip U2, one end of resistor R1 is used as the PWM signal input end, and the other end is connected to the base of transistor Q1; the set of transistor Q1 The electrode is connected to one end of resistor R2, one end of R3 and the negative electrode of the Zener diode, the other end of resistor R2 is connected to a 3.3V power supply, the other end of resistor R3 is connected to one end of capacitor C1 and the first pin of op amp chip U2, The emitter of the transistor Q1 is connected to the positive pole of the Zener diode U1, the other end of the capacitor C1, one end of the resistor R5, one end of the capacitor C2, and the second pin of the operational amplifier chip U2 and grounded; the other end of the capacitor C2 is connected to the operational amplifier The second pin of the chip U2 is connected and connected to the 12V power supply; the other end of the resistor R5 is respectively connected to one end of the resistor R4 and the third pin of the operational amplifier chip U2, and the other end of the resistor R4 is connected to the fourth pin of the operational amplifier chip U2 One end of the fuse F1, the cathode of the diode D1 and the anode of the diode D2 are connected; the anode of the diode D1 is connected to the ground, the cathode of the diode D2 is connected to a 12V power supply, and the other end of the fuse F1 is used as a signal output end. 5. A wireless single lamp control system based on LoRa technology according to claim 2, characterized in that the current collection module (36) includes a current transformer H1, a resistor R6, a resistor R7, a resistor R8, and a diode D3 , diode D4 and capacitor C3, the first pin of the current transformer H1 is used as the input end of the live wire of the power supply, the third pin is used as the output end of the live wire of the power supply, one end of the resistor R6 is connected with the second pin of the current transformer H1, the capacitor One end of C3, the cathode of diode D3, and the anode of diode D4 are connected to the microcontroller (33), and the other end is connected to the fourth pin of current transformer H1, the other end of capacitor C3, the anode of diode D3, and the cathode of diode D4 1. One end of the resistor R7 is connected to one end of the resistor R8; the other end of the resistor R7 is grounded; the other end of the resistor R8 is connected to a 3.3V power supply.