Lighting system and control method

Abstract

The invention relates to the technical field of lighting control, in particular to a lighting system and a lighting control method, and the lighting system comprises a power supply unit, a load, a first positive wire, a second positive wire, a first negative wire and a second negative wire. The control method of the lighting system comprises the following steps: adjusting a voltage signal output by a power supply unit to enable a voltage value output by the power supply unit to reach a preset range; and controlling the load to receive the voltage signal so as to enable the lighting unit to turn off lighting and the functional unit to maintain a working state. According to the invention, it can be ensured that the part, needing to continuously run, of the load is met, the working time of the lighting system can be selectively adjusted according to actual requirements, and the effects of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of lighting control, and specifically provides a lighting system and a lighting control method. Background Art

[0002] With the development of smart cities, multiple functional units are often integrated into LED lighting, such as wireless communication technology, sensor technology, cloud computing, artificial intelligence and other diversified technologies, to achieve the collection, release and transmission of urban information and improve the level of intelligent management of cities. With the rapid development of new generation information technologies such as the Internet of Things, big data, and cloud computing, the functions of functional units are constantly expanding and upgrading. For example, advanced technologies such as high-speed Wi-Fi and 5G transmitters are also integrated to form smart light poles. The application areas of smart light poles have expanded from traditional lighting to environmental monitoring, smart transportation, urban security, charging pile services, smart communities and other fields. Although the industry represented by smart light poles is showing a booming trend, it also faces some challenges.

[0003] In traditional smart pole lighting systems, each lamp is usually equipped with a separate single lamp controller for decentralized control, such as Figure 1 As shown, the LAN communication between these lamps can be wireless, wired, or via power carrier. However, there are some significant problems with this setup. First, communication may be blocked, resulting in errors in the transmission of information. Second, the controller of a single lamp may fail, causing it to not work properly. In addition, the power supply of a single lamp may also fail, further exacerbating the severity of the problem. These failures will cause some lamps to fail to turn off during the day and others to fail to turn on at night, making the entire lighting system unable to operate normally. However, the design requirement of the lighting system is to turn off during the day and turn on at night to achieve energy saving.

[0004] However, other intelligent devices on lighting poles, such as environmental monitoring systems, video surveillance equipment, information release systems, intelligent traffic management systems, urban planning equipment, and 5G micro base stations, all need to work 24 hours a day. The operation of these devices has high requirements for power supply, and it is necessary to ensure that they can obtain continuous and stable power support. Therefore, the existing lighting system has obvious defects in design and operation. These problems not only affect the overall performance of smart light poles, but also limit the further promotion and application of smart light pole lighting technology. Summary of the invention

[0005] In order to overcome the above defects, the present invention proposes a lighting system and a lighting control method, which can not only ensure that the part of the load that needs to run continuously and uninterruptedly is met, but also selectively adjust the working time of the lighting part according to actual needs, thereby achieving the effect of energy saving and emission reduction.

[0006] In a first aspect, the present invention provides a lighting system comprising:

[0007] A power supply unit, a load, a first positive line, a second positive line, a first negative line, and a second negative line, wherein:

[0008] The power supply unit is used to receive electric energy and controllably output a constant current or constant voltage signal to the load;

[0009] The load includes a lighting unit and a functional unit;

[0010] One end of the first positive line is connected to the positive output terminal of the power supply unit, the other end of the first positive line is connected to the end of the second positive line closest to the power supply unit, and the other end of the second positive line is respectively connected to the first end of each of the lighting unit and the functional unit;

[0011] One end of the first negative line is connected to the negative output terminal of the power supply unit, the other end of the first negative line is connected to the end of the second negative line farthest from the power supply unit, and the other end of the second negative line is respectively connected to the second end of each lighting unit and functional unit.

[0012] Furthermore, the functional unit includes: a 4G / 5G wireless communication module, a video monitoring module, an environmental monitoring module, a vehicle flow monitoring module, a data analysis module, a broadcast module and a data display module.

[0013] Furthermore, the system further comprises: a controller;

[0014] The power supply unit includes a control unit, a constant current control circuit and a constant voltage control circuit;

[0015] The control unit comprises a first input terminal, a second input terminal, a first output terminal and a second output terminal, the first input terminal is used to receive electric energy, the second input terminal is connected to the controller, the first output terminal is connected to the constant current control circuit, and the second output terminal is connected to the constant voltage control circuit;

[0016] The first positive line is connected to the positive output terminals of the constant current control circuit and the constant voltage control circuit respectively, and the first negative line is connected to the negative output terminals of the constant current control circuit and the constant voltage control circuit respectively.

[0017] Furthermore, the constant current control circuit includes: a first resistor, a second resistor, a third resistor, a first switch tube and a first capacitor;

[0018] Among them, the first end of the first resistor is connected to the first output end of the control unit, the second end of the first resistor is connected to the control end of the first switch tube, the first end of the first switch tube is connected to the first end of the second resistor, the second end of the second resistor is connected to a working power supply, the first end of the second resistor is connected to the first end of the third resistor, the second end of the third resistor is connected to the first end of the first capacitor, and the second end of the first capacitor is connected to the second end of the first switch tube and grounded.

[0019] Furthermore, the constant voltage control circuit includes: a fourth resistor, a fifth resistor, a second switch tube and a second capacitor; wherein, the first end of the fourth resistor is connected to the second output end of the control unit, the second end of the fourth resistor is connected to the control end of the second switch tube, the first end of the second switch tube is connected to the first end of the fifth resistor, the second end of the fifth resistor is connected to the first end of the second capacitor, and the second end of the second capacitor is connected to the second end of the second switch tube and grounded.

[0020] Furthermore, the lighting unit includes n lamps, wherein 2≤n≤N, and N is a natural number greater than or equal to 2; and the number of the functional units is greater than or equal to one.

[0021] Furthermore, the n lamps include a first lamp, a second lamp, to an nth lamp connected in parallel, wherein the first lamp, the second lamp, to the nth lamp are arranged in order from near to far in terms of distance from the power supply unit.

[0022] Further, the system also includes a third positive line and a third negative line;

[0023] The third positive line is connected to the first end of the first lamp to the i-th lamp respectively, 1≤i≤N; the second positive line between the first lamp to the i-th lamp is connected in parallel with the third positive line;

[0024] The third negative line is connected to the second ends of the jth lamp to the nth lamp respectively, 1≤j≤N; the second negative lines between the jth lamp to the nth lamp are connected in parallel with the third negative line.

[0025] Furthermore, the functional unit is connected to the third positive line or the third negative line.

[0026] Furthermore, when n is an even number, the first lamp to the i-th lamp include: the first lamp to the i-th lamp The jth lamp to the nth lamp include: Luminaires up to the nth luminaire.

[0027] Furthermore, when n is an odd number, the first lamp to the i-th lamp include: the first lamp to the i-th lamp The jth lamp to the nth lamp include: Luminaires up to the nth luminaire.

[0028] Furthermore, when n is an odd number, the first lamp to the i-th lamp include: the first lamp to the i-th lamp The jth lamp to the nth lamp include: Luminaires up to the nth luminaire.

[0029] In a second aspect, the present invention provides a control method using the lighting system, comprising:

[0030] Adjust the voltage signal output by the power supply unit so that the voltage value output by the power supply unit reaches a preset range;

[0031] The load is controlled to receive the voltage signal so that the lighting unit turns off the lighting and the functional unit keeps the working state; the load includes the lighting unit and the functional unit.

[0032] Further, the step of adjusting the voltage signal output by the power supply unit so that the voltage value output by the power supply unit is less than a preset value includes:

[0033] The voltage signal output by the power supply unit is adjusted downward so that the voltage value output by the power supply unit is less than a first threshold value so that the lighting unit is turned off, and is greater than a second threshold value so that the functional unit operates.

[0034] The above one or more technical solutions of the present invention have at least one or more of the following beneficial effects:

[0035] The control method of the present invention can not only ensure that the key functions of the load and the continuous and uninterrupted operation requirements are met, but also has flexible adjustment capabilities, and can selectively adjust the operating time of the lighting unit according to actual usage and needs. In this way, it can ensure that the load provides necessary lighting services at night or in a specific time period to ensure road safety and pedestrian convenience, and can reduce the lighting time according to actual needs during the day, non-peak hours or specific areas, thereby achieving the effect of energy saving and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In addition, similar numbers in the figures are used to represent similar components, among which:

[0037] Figure 1 It is a schematic diagram of the main structure of the existing DC power supply lighting system;

[0038] Figure 2 is a main structural schematic diagram of a lighting system according to an embodiment of the present invention;

[0039] Figure 3 is a method for controlling a lighting system according to an embodiment of the present invention;

[0040] Figure 4 is a schematic diagram of the main structure of a power supply unit according to an embodiment of the present invention;

[0041] Figure 5 It is a schematic diagram of the main structures of a lighting system including X13 and X23 according to an embodiment of the present invention. DETAILED DESCRIPTION

[0042] Some embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0043] The present invention provides a lighting system, referring to Figure 2 ,include:

[0044] A power supply unit, a load, a first positive line, a second positive line, a first negative line, and a second negative line, wherein:

[0045] The power supply unit is used to receive electric energy and controllably output a constant current or constant voltage signal to the load. Figure 2 The figure shows a situation where two power supply units are connected in parallel, that is, P1 and P2 are connected in parallel. This does not mean that there is only one implementation method. In actual use, only one power supply unit can be used, or two or more power supply units can be connected in parallel.

[0046] The load includes a lighting unit and a functional unit. In one embodiment, the lighting unit includes n lamps, wherein 2≤n≤N, N is a natural number greater than or equal to 2; and the number of the functional unit is greater than or equal to one.

[0047] One end of the first positive line X11 is connected to the positive output end of the power supply unit, the other end of the first positive line X11 is connected to the end of the second positive line X12 closest to the power supply unit, and the other end of the second positive line X12 is respectively connected to the first end of each lighting unit and functional unit.

[0048] One end of the first negative line X21 is connected to the negative output terminal of the power supply unit, the other end of the first negative line X21 is connected to the end of the second negative line X22 farthest from the power supply unit, and the other end of the second negative line X22 is respectively connected to the second end of each lighting unit and functional unit.

[0049] In one embodiment, the load is a smart lamp pole.

[0050] The present invention is significantly different from the existing lighting system in terms of power supply. In addition to equipping each lamp with a separate single-lamp controller for decentralized control, the traditional power supply method usually requires two independent lines to provide power to the lighting unit and the functional unit in the load respectively. However, the present invention proposes an innovative lighting system, which, through specific design and configuration, only requires one DC power supply line to provide the required power to the lighting unit and the functional unit in the load at the same time.

[0051] This innovative power supply method has multiple advantages. First, the present invention simplifies the complexity of the power supply system and reduces the cost of wiring and maintenance. Second, since only one power supply line is required, the reliability of the system is improved and the probability of failure is reduced. More importantly, the lighting system of the present invention can meet the demand for 24-hour uninterrupted power supply to the functional units, ensuring that the various functional units of the load can operate continuously and stably. At the same time, it can also meet the demand for street lamps to illuminate at night, ensuring the safety and brightness of the roads at night while ensuring that the lights are not turned on during the day to save energy.

[0052] Therefore, the present invention not only realizes the simultaneous power supply of the lighting unit and the functional unit in the load through a DC power supply line, but also improves the stability and reliability of the system, reduces the maintenance cost, and meets the power supply needs in different time periods.

[0053] In one embodiment, the functional unit includes: a 5G wireless communication module, a video monitoring module, an environmental monitoring module, a vehicle flow monitoring module, a data analysis module, a broadcast module and a data display module.

[0054] The 4G / 5G wireless communication module can be a small communication base station. The communication base station equipment can be mounted on the lighting unit to support the signal coverage and capacity improvement of the mobile communication network (4G / 5G).

[0055] The video surveillance module can be a surveillance camera. Some loads have video surveillance functions to monitor and record road traffic, crowd gatherings, and other situations, thereby improving the level of urban safety management.

[0056] The environmental monitoring module can be an environmental monitoring device such as a sensor, etc. The environmental monitoring device is integrated into the load to monitor environmental indicators such as air quality, temperature, humidity, etc., and timely control measures are taken to improve the urban environment.

[0057] The traffic flow monitoring module can be used to obtain traffic flow data and congestion status.

[0058] The data analysis module uses the data collection and communication functions of the load to achieve intelligent traffic management, including traffic flow judgment, congestion warning, intelligent signal control, etc. The data collected by the load can also provide reference for urban planning and development, including information such as traffic conditions and crowded areas.

[0059] The data display module can be through an LED display screen or a voice broadcast device, so that the load can publish public information such as environmental information, weather forecasts, emergency notices, etc.

[0060] The load devices corresponding to the above functional units work 24 hours a day and require 24-hour uninterrupted power supply.

[0061] The lighting unit needs to be turned off during the day and all or part of the lamps need to be turned on at night. In order to solve this problem, the present invention also provides a control method for the lighting system. Figure 3 ,include:

[0062] S1, adjusting the voltage signal output by the power supply unit so that the voltage value output by the power supply unit reaches a preset range;

[0063] S2, controlling the load to receive the voltage signal so that the lighting unit turns off the lighting and the functional unit remains in a working state. The load includes a lighting unit and a functional unit.

[0064] The control method of the present invention is exemplified as follows: the DC street lamp has an operating voltage of 250V, and the power supply unit provides an adjustable output voltage. When the lamp terminal voltage is 250V, the lamp power is rated. When the lamp terminal voltage drops by about 10%, the lamp power is 0, i.e. the light is turned off. At this time, the loop voltage is 225V, and the functional unit equipment mounted on the lamp pole can still obtain normal operating voltage, achieving 24-hour continuous operation.

[0065] The control method of the present invention can not only ensure that the key functions of the functional units of the load and the continuous and uninterrupted operation requirements are met, but also has flexible adjustment capabilities, and can selectively adjust the operating time of the lighting units of the load according to actual usage and needs. In this way, it can not only ensure that the load provides necessary lighting services at night or in a specific time period to ensure road safety and pedestrian convenience, but also reduce the lighting time according to actual needs during the day, non-peak hours or specific areas, thereby achieving the effect of energy saving and emission reduction. This intelligent management method not only improves the efficiency of the lighting system, but also reduces operating costs, and also provides strong support for smart urban management.

[0066] In one embodiment, in step S1, adjusting the voltage signal output by the power supply unit so that the voltage value output by the power supply unit is less than a preset value includes:

[0067] The voltage signal output by the power supply unit is adjusted downward so that the voltage value output by the power supply unit is less than a first threshold value so that the lighting unit is turned off, and is greater than a second threshold value so that the functional unit operates.

[0068] In one application scenario, during the night, the smart light pole not only needs to provide lighting, but also needs to ensure that the functional units it carries can continue to operate. Take the case where the functional unit carried by the smart light pole is a 5G camera and the lighting unit is an LED lamp as an example for detailed description. By controlling the voltage signal output by the power supply unit, the voltage value output by the power supply unit can reach 240V, so that the lamps will be fully lit and the 5G camera can work normally. However, when the natural brightness of the environment gradually increases, in order to save energy and reduce light pollution, the brightness of the lamps needs to be reduced. At this time, by adjusting the voltage signal output by the power supply unit, the voltage value output by the power supply unit is reduced to 200V. Although the voltage value has decreased, since the power supply voltage range required for the normal operation of the 5G camera is 85V-260V, the 5G camera can still work normally and continuously even if the voltage output by the power supply unit drops to 200V.

[0069] As the night ends and the day comes, all lighting equipment needs to be turned off according to relevant requirements. At this time, the voltage signal output by the power supply unit is adjusted again to reduce the voltage value output by the power supply unit to 170V. Since the on-voltage of LED lamps is usually above 176V, when the voltage value output by the power supply unit is 170V, the threshold voltage of the LED lamp cannot be reached, so the light will not light up. However, the 5G camera can still work normally and continuously because its power supply voltage range is 85V-260V, so even when the lighting is turned off during the day, the 5G camera can still maintain normal operation. In this way, the smart light pole can flexibly adjust the working status of its functional unit and lighting unit in different time periods to meet actual needs while achieving energy saving and efficient management.

[0070] The present invention combines the working power supplies of functional unit equipment carried on street lamps and lamp poles, such as 5G micro base stations, video surveillance, environmental monitoring, information release, intelligent traffic management, urban planning and other equipment into one, and realizes safe DC power supply. It also eliminates single-lamp controllers, single-lamp drive power supplies and communication LAN equipment with high failure rates, while reducing cable investment. It is of great significance, especially for the renovation of old street lamps without the need for new cables.

[0071] The optimized design of the lighting system of the present invention is further described below.

[0072] In one embodiment, the system further includes: a controller.

[0073] The power supply unit includes a control unit, a constant current control circuit and a constant voltage control circuit.

[0074] The power supply unit is a constant current and constant voltage dual-controlled power supply, and each power supply unit includes a control unit, a constant current control circuit and a constant voltage control circuit.

[0075] The control unit is a microcontroller, such as a single chip microcomputer.

[0076] After receiving the control signal, the control unit switches the system to constant current or constant voltage control and controls the corresponding output signal size.

[0077] The control unit is connected to the controller for communication. In one embodiment, the control unit is connected to the controller for communication via RS485 or CAN to transmit control signals of the controller.

[0078] The control unit includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The first input terminal is used to receive electric energy. The second input terminal is connected to the controller. The first output terminal is connected to the constant current control circuit. The second output terminal is connected to the constant voltage control circuit. The constant current control circuit is used to output a constant current. The constant voltage control circuit is used to output a constant voltage. The constant current control circuit and the constant voltage control circuit can be controlled to select one to work and the other to be turned off. The power supply unit can selectively output a constant voltage or a constant current. When the power supply unit outputs a constant voltage, the lighting is controlled by a constant voltage mode. When the power supply unit outputs a constant current, the lighting is controlled by a constant current mode.

[0079] The first positive line is connected to the positive output terminals of the constant current control circuit and the constant voltage control circuit respectively, and the first negative line is connected to the negative output terminals of the constant current control circuit and the constant voltage control circuit respectively.

[0080] In one embodiment, the controller is a chopper controller.

[0081] The controller is connected to the constant current and constant voltage dual-controlled power supply P1 and the constant current and constant voltage dual-controlled power supply P2. The main responsibility of the controller is to send instructions to the constant current and constant voltage dual-controlled power supply. In this way, the controller can effectively control the constant voltage power supply or constant current power supply and adjust the output voltage or current to ensure that the power supply of the entire system is in the best state.

[0082] The controller adjusts the output strategy in time to ensure the optimization of the lighting effect, function and energy efficiency of the load, avoid system failure when a short circuit occurs in the system, and maintain lighting.

[0083] In one embodiment, the controller is of TGK model.

[0084] The present invention sets the traditional constant current or constant voltage control lighting system as a constant current and constant voltage dual control system, and can start constant current or constant voltage control according to different states of the lighting unit. The combination of dual control can not only ensure that the lighting unit plays a protective role when the number of lamps changes or even sudden failures, but also maintain the uninterrupted continuous lighting of the lamps, which is beneficial to the safety and stable operation of the circuit, and provides users with a safer and more reliable lighting environment.

[0085] In one embodiment, referring to Figure 4 The constant current control circuit includes: a first resistor R11, a second resistor R12, a third resistor R13, a first switch tube T1 and a first capacitor C1. The control unit is an MCU.

[0086] A first end of the first resistor R11 is connected to a first output end of the control unit MCU, a second end of the first resistor R11 is connected to a control end of the first switch tube T1, a first end of the first switch tube T1 is connected to a first end of the second resistor R12, a second end of the second resistor R12 is connected to a working power supply VCC, a first end of the second resistor R12 is connected to a first end of a third resistor R13, a second end of the third resistor R13 is connected to a first end of a first capacitor C1, a second end of the first capacitor C1 is connected to a second end of the first switch tube T1 and is grounded GND.

[0087] In one embodiment, the first switch tube T1 includes a triode or a MOS field effect tube.

[0088] In an application scenario, the first switch tube is a triode, the control end of the first switch tube T1 is a base, the first end of the first switch tube T1 is a collector, and the second end of the first switch tube T1 is an emitter.

[0089] In an application scenario, the first switch tube T1 is a MOS field effect tube, the control end of the first switch tube T1 is a gate, the first end of the first switch tube T1 is a drain, and the second end of the first switch tube T1 is a source.

[0090] In one embodiment, still referring to Figure 4 The constant voltage control circuit includes: a fourth resistor R21, a fifth resistor R22, a second switch tube T2 and a second capacitor C2.

[0091] A first end of the fourth resistor R21 is connected to the second output end of the control unit, a second end of the fourth resistor R21 is connected to the control end of the second switch tube T2, a first end of the second switch tube T2 is connected to a first end of the fifth resistor R22, a second end of the fifth resistor R22 is connected to a first end of the second capacitor C2, and a second end of the second capacitor C2 is connected to a second end of the second switch tube T2 and is grounded.

[0092] In one embodiment, the second switch tube includes a triode or a MOS field effect tube.

[0093] In one application scenario, the second switch tube is a triode, the control end of the second switch tube is a base, the first end of the second switch tube is a collector, and the second end of the second switch tube is an emitter.

[0094] In one application scenario, the second switch tube is a MOS field effect tube, the control end of the second switch tube is a gate, the first end of the second switch tube is a drain, and the second end of the first switch tube is a source.

[0095] In one embodiment, the n lamps include a first lamp, a second lamp, to an nth lamp connected in parallel, wherein the first lamp, the second lamp, to the nth lamp are arranged in order from near to far in terms of distance from the power supply unit.

[0096] Figure 2 and Figure 5 In the example, the n lamps include: LP1, LP2, LPn-1, and LPn.

[0097] Each of the lamps is connected in parallel between the second positive line X12 and the second negative line X22, and each of the functional units is connected in parallel between the second positive line X12 and the second negative line X22.

[0098] The functional units are interspersed between the lamps with no restriction on the position.

[0099] One end of the first positive line X11 is connected to the power supply unit, and the other end is connected to LP1. One end of the second positive line X21 is connected to the power supply unit, and the other end is connected to LPn.

[0100] The following example illustrates the control method of constant voltage and constant current.

[0101] When starting the constant voltage control, the constant current control needs to be turned off at the same time. The controller sends a constant voltage control instruction, and the control unit is MCU that receives the constant voltage control signal through CAN. The constant voltage control circuit outputs a constant voltage signal according to the constant voltage control instruction, that is, the control unit outputs a PMW2 signal at the first end of R21. At the same time, the control unit outputs a PMW low-level signal at the first end of R11, so that T1 is cut off. At this time, the intersection of R12, R11 and the input end of T1 is recorded as A1, which is a high level, and the high level of the working power supply VCC is output, so that the constant current output part is turned off, and the power supply unit only outputs a constant voltage.

[0102] When starting the constant current control, the constant voltage control needs to be turned off at the same time. The controller sends a constant current control instruction, and the control unit is MCU that receives the constant current control signal through CAN. The constant current control circuit outputs a constant current signal according to the constant current control instruction, that is, the control unit outputs a PMW1 signal at the first end of R11. At the same time, the control unit outputs a PMW low-level signal at the first end of R21, so that T2 is in a high-impedance state and the voltage output is zero, so that the constant voltage output part is turned off, and the power supply unit only outputs a constant current.

[0103] In summary, the PWM pulse width controls the on or off state. When T1 is steadily off, it is constant voltage control, and when T2 is in a steady high impedance state, it is constant current control. When constant current control is performed, the control input end of the constant voltage control circuit is in a high impedance state, and when constant voltage control is performed, the control input end of the constant current control circuit is in a high level state.

[0104] In one embodiment, the lamp comprises an LED lamp.

[0105] In one embodiment, referring to Figure 2 , the n lamps include the 1st lamp, the 2nd lamp, and up to the nth lamp connected in parallel. In one embodiment, the 1st lamp, the 2nd lamp, and up to the nth lamp are the 1st LED lamp, the 2nd LED lamp, and up to the nth LED lamp. The 1st LED lamp is the lamp closest to the power supply unit, and the nth LED lamp is the lamp farthest from the power supply unit. The functional unit includes: two 5G cameras, namely the first 5G camera (denoted as 5G1) and the second 5G camera (denoted as 5G2). The first 5G camera is located between LP2 and LP3, and the second 5G camera is located between LPn-1 and LPn-2. The first ends of 5G1 and 5G2 are respectively connected to X12.

[0106] One end of the first positive line X11 is connected to the positive output end of the power supply unit, that is, the positive output end of the constant current control circuit and the constant voltage control circuit, and the other end of the first positive line X11 is connected to the second positive line X12. The other end of the second positive line X12 is sequentially connected to the positive ports of the first lamp, the second lamp, the first 5G camera, the n-1th lamp, the second 5G camera, and the nth lamp.

[0107] One end of the first negative line X21 is connected to the negative output ends of the constant current control circuit and the constant voltage control circuit respectively, and the other end is connected to one end of the second negative line X22. The other end of the second negative line X22 is connected to the second end of each of the lamps (the nth lamp, the n-1th lamp, the second 5G camera, the n-2th lamp to the third lamp, the first 5G camera, the second lamp, and the first lamp) in sequence.

[0108] The first ends of the functional units (5G1 and 5G2) are connected to the second positive line X12, and the second ends of the functional units (5G1 and 5G2) are connected to the second negative line X22.

[0109] In this way, through Figure 2 The wiring method can balance the voltage drop of the lighting unit circuit to a certain extent. Although the voltage of the middle lamp drops slightly and the brightness of the lamp is slightly lower, the deviation generally does not exceed -10%.

[0110] With the increasing scale of buildings and the diversification of lighting needs, how to ensure that lamps in every corner can obtain a stable voltage supply to achieve uniform and comfortable lighting effects has become an urgent problem to be solved. Figure 2 The wiring method shown has largely alleviated the problem of uneven voltage distribution in the lighting unit line. This method effectively reduces the voltage drop caused by resistance during long-distance power transmission by cleverly adjusting the layout and connection method of the line. In particular, for the lamps in the middle position, although their voltage will still be affected to a certain extent due to their distance from the power center, this effect has been significantly weakened compared to the traditional wiring method. According to the measured data, after adopting the improved wiring method, the voltage deviation of the middle lamp is generally controlled within -10%, which is a completely acceptable range for most lighting applications.

[0111] Whether in large commercial complexes, high-rise office buildings or public venues, this improvement method can significantly improve the voltage distribution of the lighting system, improve lighting quality and energy efficiency.

[0112] In one embodiment, the wiring method is further improved. The system further includes a third positive line X13 and a third negative line X23. The functional unit is connected to the third positive line or the third negative line. The position of the functional unit is not limited.

[0113] Reference Figure 5 , the third positive line X13 is respectively connected to the first end of the first lamp to the i-th lamp, 1≤i≤N; the second positive line X12 between the first lamp to the i-th lamp is connected in parallel with the third positive line X13. The functional unit includes: a first 5G camera (denoted as 5G1) and a second 5G camera (denoted as 5G2), the first 5G camera is located between LP1 and LP2, and the second 5G camera is located between LPn and LPn-1. The first end of 5G1 is connected to the third positive line X13.

[0114] The third negative line X23 is connected to the second end of the jth unit to the nth unit, 1≤j≤N; the second negative line X22 between the jth lamp to the nth lamp is connected in parallel with the third negative line X23. The second end of 5G2 is connected to the third negative line X23.

[0115] The i-th lamp and the j-th lamp are used to represent the lamp located in the middle of the lamps. Because the total number of lamps is affected by odd numbers and even numbers, the method of determining the so-called middle lamp is slightly different.

[0116] In one embodiment, when n is an even number, the first lamp to the i-th lamp include: the first lamp to the i-th lamp The jth lamp to the nth lamp include: Luminaires up to the nth luminaire.

[0117] For example, the lighting unit has 10 lamps, n=10, i=j=5. The 10 lamps include the first lamp, the second lamp, the third lamp, the fourth lamp to the ninth lamp and the tenth lamp connected in parallel in order from near to far from the power supply unit. The third positive line X13 is connected to the first end (positive port) of the first to fifth lamps respectively. The third negative line X23 is connected to the second end (negative port) of the sixth unit to the tenth unit respectively.

[0118] The i lamps and functional units connected to the third positive line X13 include: the first lamp, the first 5G camera, the second lamp, the third lamp to the fifth lamp.

[0119] The j lamps and functional units connected to the third negative line X23 include: the 6th lamp, the 7th lamp, the 8th lamp, the 9th lamp, the second 5G camera and the 10th lamp.

[0120] In one embodiment, when n is an odd number, the first lamp to the i-th lamp include: the first lamp to the i-th lamp The jth lamp to the nth lamp include: Luminaires up to the nth luminaire.

[0121] In an application scenario, n is 7, and the third positive line X13 is connected to the first end (positive port) of the first lamp, the first 5G camera, the second lamp, the third lamp, and the fourth lamp, respectively. The third negative line X23 is connected to the second end (negative port) of the fifth lamp, the sixth lamp, the second 5G camera, and the seventh lamp, respectively. The number of lamps in the front half of the distance to the power supply unit is one more than the number of lamps in the rear half of the distance to the power supply unit.

[0122] In one embodiment, when n is an odd number, the first lamp to the i-th lamp include: the first lamp to the i-th lamp The jth lamp to the nth lamp include: Luminaires up to the nth luminaire.

[0123] In an application scenario, n is 9, and the third positive line X13 is connected to the first end (positive port) of the first lamp, the first 5G camera, the second lamp, the third lamp, and the fourth lamp respectively. The third negative line X23 is connected to the second end (negative port) of the fifth lamp, the sixth lamp, the seventh lamp, the eighth lamp, the second 5G camera, and the ninth lamp respectively. The number of lamps in the front half of the distance to the power supply unit is one less than that in the rear half of the distance to the power supply unit.

[0124] When n is an odd number, although the front and rear lamps are not completely identical, the difference is only 1, so the i-th lamp and the j-th lamp can be approximately considered as intermediate lamps, especially in long-distance and long-line lighting situations such as tunnels and public lighting.

[0125] This embodiment optimizes the light source layout and effect, especially in long-distance and long-line lighting scenarios such as tunnels and public lighting. When n is an odd number, although the configuration of the lamps in the front and rear parts is not completely mirror-symmetrical, there is only a slight difference, and this difference is only one lamp. In practical applications, due to various restrictions (such as installation space, cost budget, etc.), it is difficult to achieve a completely symmetrical lamp layout. Therefore, "the i-th lamp and the j-th lamp can be used as the middle lamp" and the lighting line design and adjustment can be carried out accordingly.

[0126] Relative to Figure 2 Wiring method, Figure 5 The wiring method adds X13 and X23 lines, further reducing the difference in brightness between the middle lamp and the two ends of the lamp, and significantly improving the uniformity of the overall lamp.

[0127] The present invention can shunt the current at both ends of the LED lamp connected in parallel through the third positive line X13 and the third negative line X23. Under the condition of constant current of the LED lamp, the voltage at both ends of multiple LED lamps tends to be balanced, reducing the voltage drop problem of the middle LED lamp when multiple LED lamps are connected in parallel, thereby meeting the constant current and voltage equalization requirements of the LED lamp.

[0128] The lighting unit of the present invention realizes the constant current and voltage equalization effect of the LED lamp group in parallel connection through ingenious design, which greatly improves the stability and efficiency of the lighting system. The core lies in the introduction of the third positive line X13 and the third negative line X23. These two special connecting lines play a vital role in the LED lamp group.

[0129] In a traditional parallel LED lamp group, due to the slight differences between the LED lamps (such as different internal resistance), when current passes through, the LED lamp in the middle position often suffers a large voltage drop, thereby affecting its luminous efficiency and life. The present invention realizes effective current shunting at both ends of the parallel LED lamps by adding X13 and X23 connecting wires.

[0130] Specifically, the X13 and X23 cables serve as current shunt channels to ensure that the voltages at both ends of each LED lamp are consistent. This design not only reduces the voltage drop problem of the middle LED lamp, but also ensures that each LED lamp in the entire lamp group can obtain a stable and uniform current supply.

[0131] In addition, the present invention also demonstrates wide adaptability and flexibility in practical applications. Whether it is indoor lighting, outdoor landscape lighting or automotive lighting, the constant current and voltage equalization effect of LED lamps can be achieved by properly configuring the X13 and X23 connecting wires.

[0132] In one embodiment, there are multiple power supply units, and the power supply units are connected in parallel. Figure 2 and Figure 5 In the example, two power supply units P1 and P2 are connected in parallel.

[0133] The lighting system of the present invention adopts a DC centralized drive mode, and a constant voltage or constant current power supply. When lighting starts, the power supply unit is controlled to perform constant voltage control to ensure the stability of the circuit. When it is detected that the current of the lighting unit in the system is too high, the controller switches the constant voltage control to constant current control to optimize the performance of the power supply. The advantage of this method is that when a short circuit occurs in the circuit, the maximum value of the short-circuit current will be limited to the constant current value range output by the power supply unit.

[0134] The present invention also provides a method for lighting control using the above lighting system, comprising:

[0135] (1) Controlling the constant current control circuit of the power supply unit through the controller to output a constant current;

[0136] (2) The lighting unit receives the constant current;

[0137] (3) obtaining an output voltage value corresponding to the constant current control circuit when outputting the constant current;

[0138] (4) using the obtained voltage value as a preset rated voltage value, and controlling the constant voltage control circuit of the power supply unit to output a constant voltage through a controller based on the preset rated voltage value;

[0139] (5) The lighting unit receives the constant voltage and illuminates.

[0140] In one embodiment, in step (1), controlling the constant current control circuit of the power supply unit to output a constant current by means of a controller includes:

[0141] (1-1), obtaining the number n of lamps of the lighting unit;

[0142] (1-2), obtaining the rated power and rated voltage of the lamp;

[0143] (1-3) obtaining a rated current of the lighting unit based on the number n, the rated power and the rated voltage;

[0144] (1-4), according to the rated current, the controller controls the constant current control circuit to output a constant current.

[0145] With this constant current, the output voltage value corresponding to the constant current control circuit when outputting the constant current can be obtained through measurement and collection.

[0146] In an application scenario, the lamp is an LED lamp, and the number of the LED lamps is 10 (n=10).

[0147] Figure 2 In the system, the rated power of a single LED lamp is 220W, and the rated voltage is DC 220V. By calculation, the rated current of a single LED lamp is 1A.

[0148] The total current of 10 LED lights is 10A.

[0149] The controller controls the constant current control circuit to output a constant current of 10A, and collects the output voltage value of the constant current control circuit under the output current of 10A, which is measured to be 230V. 230V is generated with 10A, and is often measured and collected. 230V is the voltage with actual line loss voltage drop. This voltage is used as the reference for constant voltage control, 230V is stored, and this voltage value is used as the control value of 100% of the rated constant voltage output of the power supply unit.

[0150] In one embodiment, the method further comprises:

[0151] (6) sending a dimming instruction to the power supply unit through the controller, so that the voltage value output by the constant voltage control circuit of the power supply unit is less than or equal to the preset rated voltage value;

[0152] (7) The constant voltage control circuit outputs a constant voltage according to the instruction.

[0153] In an application scenario, the lamp is an LED lamp, and the number of LED lamps is 10. The rated current of a single LED lamp is calculated to be 1A. After measurement, when all 10 lamps are normally illuminated at the rated state, the actual line loss voltage drop is 230V. 230V is generated by 10A.

[0154] After turning off the two lamps, in order to stabilize the brightness of the lamps and avoid overload, the controller controls the constant voltage control circuit of the power supply unit to output a constant voltage downward, taking 230V as the actual 100% rated voltage reference, and the adjusted output constant voltage adjustment value is 229V.

[0155] After turning off the five lamps, the controller controls the constant voltage control circuit of the power supply unit to adjust the output constant voltage downward, and the output constant voltage adjustment value is 228V after adjustment.

[0156] The above voltage adjustment value can be obtained by using a pre-established line current-voltage mapping relationship.

[0157] After the circuit is built, the constant current and constant voltage dual-controlled power supply unit outputs a constant current according to the rated current value of the lighting unit; the lighting unit receives the constant current and illuminates; the constant current and constant voltage dual-controlled power supply of the power supply unit automatically obtains and stores the lighting unit voltage and line loss voltage drop, and uses this voltage value as the rated constant voltage output 100% control value of the power supply unit; when the load of the lighting unit increases and the output current of the constant current and constant voltage dual-controlled power supply of the power supply unit reaches its rated output current, the constant current and constant voltage dual-controlled power supply unit automatically switches from constant voltage output to constant current output and illuminates.

[0158] When dimming control is performed, the controller sends the rated constant voltage output and the following control value command to the constant current and constant voltage dual-controlled power supply of the power supply unit. When the output voltage is reduced, the corresponding lighting unit current is also automatically reduced, and the brightness of the lamp is also automatically reduced to achieve the purpose of dimming and energy saving.

[0159] In one embodiment, the method further comprises:

[0160] (8) When it is detected that the current value output by the power supply unit reaches or exceeds the rated current of the lighting unit, the power supply unit switches to constant current control and stops constant voltage control.

[0161] In the previous application scenario, it is calculated that the rated current of the lighting unit is 10A, and this value is used as the upper limit of the allowable current.

[0162] When the number of lamps in the circuit increases from 10 to 15, when it is detected that the current value output by the power supply unit reaches 10A, or is greater than 10A, it indicates that the system is at risk of overload. At this time, the power supply unit switches to constant current control and stops constant voltage control.

[0163] During the constant voltage control process of the lighting system, when the current of the lighting unit is detected to have risen to the critical point of 10A, it will immediately switch to the constant current power supply mode to ensure that the system will not be overloaded. In this way, the system can intervene immediately when the current shows a slight upward trend, effectively avoiding the occurrence of overload and building a solid protective wall for the lighting unit.

[0164] When the current in the lighting circuit where the lamp is located begins to show signs of overload, the present invention immediately triggers the switching of the constant current power supply mode. In the constant current power supply mode, the system can ensure that the lamp continues to illuminate and emit light, while strictly limiting the current within a preset safety range, which not only ensures the continuity and stability of the lighting, but also avoids irreversible damage to the lamp caused by excessive current.

[0165] Therefore, the constant current power supply switching mechanism in the constant voltage control of the lighting system of the present invention is undoubtedly a technical innovation of great significance. It not only improves the safety and stability of the lighting system, but also significantly prolongs the service life of the lamp and reduces the maintenance cost.

[0166] In one embodiment, in (8), the power supply unit switches to constant current control and stops constant voltage control at the same time, including:

[0167] The controller controls the constant current control circuit to output a constant current according to the rated current and controls the constant voltage control circuit to stop outputting a constant voltage.

[0168] Specific description: In the previous application scenario, it is calculated that the rated current of the lighting unit is 10A, and this value is used as the upper limit of the current.

[0169] The controller sends a command to output a constant current of 10A to the control unit of the power supply unit through the 485 serial port or CAN bus. After receiving the command, the control unit controls the constant current control circuit to output 10A and controls the constant voltage control circuit to be cut off. For example, refer to Figure 3 A PWM2 low-level signal is output to the constant voltage control circuit to put the constant voltage control circuit in a high-impedance state and cut off.

[0170] The core of the present invention is to implement precise constant voltage and constant current control strategies for the lighting system. Specifically, when the system starts formal lighting, the constant voltage control part in the power supply unit enters the working state, outputs a stable and constant voltage, and provides a solid power foundation for the entire lighting system. At this stage, the constant current power supply remains silent and does not participate in the distribution and conversion of electrical energy.

[0171] In constant pressure control mode, for example Figure 5 With the wiring method, the lamps in the lighting unit, whether LED lamp beads or other types of light sources, can emit bright and uniform light under the drive of constant voltage. It is worth noting that even if the number of lamps in the lighting unit is reduced for some reason (such as manually turning off the lamps, some lamp beads are damaged or failed, etc.), since the voltage at both ends of each lamp remains consistent, the lighting effect of the entire lighting system will not be significantly affected. The cleverness of this design is that it ensures the stability and reliability of the lighting system in the face of emergencies.

[0172] However, the stable operation of the lighting system is not a one-time thing. In practical applications, as the load increases or the circuit ages, the current of the lighting unit may gradually increase, or even exceed the preset safety threshold. At this time, the system is facing the risk of overload. To this end, the present invention introduces an intelligent monitoring and switching mechanism. When it is detected that the current of the lighting unit exceeds a certain limit, this mechanism will respond quickly and automatically switch the power supply unit from the constant voltage control mode to the constant current control mode. In this mode, the originally silent constant current control part starts to work, and it outputs a constant and controlled constant current to ensure that the lighting system can still maintain a stable lighting effect when the load changes. At the same time, the constant voltage control part exits the working state to avoid unnecessary energy loss and safety hazards.

[0173] The present invention uses precise constant voltage and constant current control strategies to ensure the stable operation of the entire lighting system regardless of how the number of lamps in the lighting unit changes. The lamps will not go out and the lighting can be maintained continuously. This stability not only improves the user experience, but also greatly reduces the safety hazards caused by system failures.

[0174] The introduction of intelligent monitoring and switching mechanism makes the present invention highly automated and intelligent, and can automatically adjust the working state to adapt to different load conditions without relying on human intervention, thereby reducing operation and maintenance costs and improving the maintainability of the system.

[0175] In one embodiment, there are multiple power supply units.

[0176] When there are multiple power supply units, they can be used simultaneously or some can be used selectively and the rest can be kept as standby.

[0177] In one embodiment, the multiple power supply units include a main power supply and a backup power supply. There can be one or more main power supplies, and the backup power supply is also connected to the system. In modern power systems, the stability and reliability of power supply units are crucial, especially in those occasions with high requirements for continuous power supply, such as tunnel lighting. In this embodiment, a combination of a main power supply and a backup power supply is used. How does this configuration ensure that the system can achieve uninterrupted lighting?

[0178] In an application scenario, there are three power supply units P1, P2 and P3 connected in parallel, P3 is a backup, and the other two (P1 and P2) are in use. Each power supply has an output power of 1 kW, and the total output power is 2 kW. There are 10 lamps in the lighting unit. When one of P1 or P2 is damaged and the other can work normally, the total output power is 1 kW, so the brightness of the lighting unit is reduced by half. Although the brightness is reduced, the lighting can still be maintained. After the backup power supply P3 is put into use, the lighting effect is still 2 kW output power, ensuring the lighting effect.

[0179] In one embodiment, when the multiple power supply units are used simultaneously,

[0180] Collect the current value output by each power supply unit;

[0181] Obtaining a current output mean value according to the current value;

[0182] Based on the current output mean value, the voltage value output by each power supply unit is adjusted by the controller.

[0183] In this embodiment, the current average is used as a target to adjust the voltage value output by each power supply unit to balance the output of the power supply unit.

[0184] Reference Figure 5 , two constant current and constant voltage dual-controlled power supply units are used, and the two units are connected in parallel to achieve output. Each power supply unit includes an independent control unit, namely a single-chip microcomputer, which is used to monitor and sample current values ​​in real time. When there is a difference between these sampled current values, the system uses the average value of all sampled currents as the control target. Through the precise adjustment of the controller, the output voltage of each power supply unit will be adjusted accordingly. Specifically, if the current value of a power supply unit is higher than the average value, that is, a positive deviation occurs, the controller will instruct the power supply unit to lower its output voltage; on the contrary, if the current value of a power supply unit is lower than the average value, that is, a negative deviation occurs, the controller will instruct the unit to increase its output voltage.

[0185] The advantage of this design method is that it can effectively achieve voltage balancing control without relying on complex voltage balancing line circuits. Traditional voltage balancing line circuits not only increase the complexity and cost of the power supply system, but may also cause crosstalk and oscillation failures between individual power supply units. Through this method based on current sampling and voltage regulation, the overall cost of the power supply system can be significantly reduced, and the stability and reliability of the system can be improved. In addition, this intelligent control strategy can also dynamically adapt to load changes, ensuring the stability and consistency of power supply output, thereby providing more reliable and efficient power support for various applications.

[0186] The innovation of power control technology is crucial to improving equipment efficiency and ensuring circuit safety. The unique control strategy adopted by the present invention is an important breakthrough in this field. The present invention performs constant voltage control on the lighting system to ensure that the voltage across the lighting fixture remains constant within a preset range. Voltage stability is of great significance for lighting systems with multiple lamps in parallel, as it is directly related to the luminous efficiency and uniformity of the lamps.

[0187] On the basis of constant voltage control, a constant current control strategy is also cleverly incorporated to effectively resist the potential threats brought by external shocks and internal faults. When a short circuit occurs in the circuit, the short-circuit current may instantly soar to dozens of times the rated current or even higher, causing a devastating blow to the circuit system. The constant current control strategy of the present invention can respond quickly and limit the short-circuit current to a preset constant current value range, thereby effectively avoiding the damage caused by high current shocks to the circuit system.

[0188] This combination of dual control can not only ensure that the lighting system plays a protective role when the number of lamps changes or even sudden failures occur, but also maintain the uninterrupted lighting of the lamps, which is conducive to the safety and stable operation of the circuit, and provides users with a safer and more reliable lighting environment. Whether in the field of home lighting, commercial lighting or industrial lighting, the present invention can play a huge role. It can not only improve the overall efficiency and stability of the lighting system, but also reduce maintenance costs and safety risks, bringing users a more convenient, efficient and safe lighting experience.

[0189] It should be pointed out that although the various steps in the above embodiments are described in a specific order, those skilled in the art can understand that in order to achieve the effects of the present invention, different steps do not have to be performed in such an order. They can be performed simultaneously (in parallel) or in other orders. These changes are within the scope of protection of the present invention.

[0190] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A lighting system, characterized in that: include: A power supply unit, a load, a first positive line, a second positive line, a first negative line, and a second negative line, wherein: The power supply unit is used to receive electric energy and controllably output a constant current or constant voltage signal to the load; The load includes a lighting unit and a functional unit; One end of the first positive line is connected to the positive output terminal of the power supply unit, the other end of the first positive line is connected to the end of the second positive line closest to the power supply unit, and the other end of the second positive line is respectively connected to the first end of each of the lighting unit and the functional unit; One end of the first negative line is connected to the negative output terminal of the power supply unit, the other end of the first negative line is connected to the end of the second negative line farthest from the power supply unit, and the other end of the second negative line is respectively connected to the second end of each lighting unit and functional unit.

2. The system according to claim 1, characterized in that The functional units include: 4G / 5G wireless communication module, video monitoring module, environmental monitoring module, vehicle flow monitoring module, data analysis module, broadcast module and data display module.

3. The system according to claim 1, characterized in that The system further includes: a controller; The power supply unit includes a control unit, a constant current control circuit and a constant voltage control circuit; The control unit comprises a first input terminal, a second input terminal, a first output terminal and a second output terminal, the first input terminal is used to receive electric energy, the second input terminal is connected to the controller, the first output terminal is connected to the constant current control circuit, and the second output terminal is connected to the constant voltage control circuit; The first positive line is connected to the positive output terminals of the constant current control circuit and the constant voltage control circuit respectively, and the first negative line is connected to the negative output terminals of the constant current control circuit and the constant voltage control circuit respectively.

4. The system according to claim 3, characterized in that The constant current control circuit comprises: a first resistor, a second resistor, a third resistor, a first switch tube and a first capacitor; Among them, the first end of the first resistor is connected to the first output end of the control unit, the second end of the first resistor is connected to the control end of the first switch tube, the first end of the first switch tube is connected to the first end of the second resistor, the second end of the second resistor is connected to a working power supply, the first end of the second resistor is connected to the first end of the third resistor, the second end of the third resistor is connected to the first end of the first capacitor, and the second end of the first capacitor is connected to the second end of the first switch tube and grounded.

5. The system according to claim 4, characterized in that The constant voltage control circuit includes: a fourth resistor, a fifth resistor, a second switch tube and a second capacitor; wherein, the first end of the fourth resistor is connected to the second output end of the control unit, the second end of the fourth resistor is connected to the control end of the second switch tube, the first end of the second switch tube is connected to the first end of the fifth resistor, the second end of the fifth resistor is connected to the first end of the second capacitor, and the second end of the second capacitor is connected to the second end of the second switch tube and grounded.

6. The system according to claim 1, characterized in that The lighting unit includes n lamps, wherein 2≤n≤N, and N is a natural number greater than or equal to 2; and the number of the functional units is greater than or equal to one.

7. The system according to claim 6, characterized in that The n lamps include a first lamp, a second lamp, to an nth lamp connected in parallel, wherein the first lamp, the second lamp, to an nth lamp are arranged in order from near to far in terms of distance from the power supply unit.

8. The system according to claim 7, characterized in that The system also includes a third positive line and a third negative line; The third positive line is connected to the first end of the first lamp to the i-th lamp respectively, 1≤i≤N; the second positive line between the first lamp to the i-th lamp is connected in parallel with the third positive line; The third negative line is connected to the second ends of the jth lamp to the nth lamp respectively, 1≤j≤N; the second negative lines between the jth lamp to the nth lamp are connected in parallel with the third negative line.

9. The system according to claim 8, characterized in that The functional unit is connected to the third positive line or the third negative line.

10. The system according to claim 8, characterized in that When n is an even number, the first lamp to the i-th lamp include: the first lamp to the i-th lamp The jth lamp to the nth lamp include: Luminaires up to the nth luminaire.

11. The system according to claim 8, characterized in that When n is an odd number, the first lamp to the i-th lamp include: the first lamp to the i-th lamp The jth lamp to the nth lamp include: Luminaires up to the nth luminaire.

12. The system according to claim 8, characterized in that When n is an odd number, the first lamp to the i-th lamp include: the first lamp to the i-th lamp The jth lamp to the nth lamp include: Luminaires up to the nth luminaire.

13. A control method using the lighting system according to any one of claims 1 to 12, characterized in that: include: Adjust the voltage signal output by the power supply unit so that the voltage value output by the power supply unit reaches a preset range; The control load receives the voltage signal so that the lighting unit turns off the lighting and the functional unit keeps the working state.

14. The method according to claim 13, characterized in that The step of adjusting the voltage signal output by the power supply unit so that the voltage value output by the power supply unit is less than a preset value comprises: The voltage signal output by the power supply unit is adjusted downward so that the voltage value output by the power supply unit is less than a first threshold value so that the lighting unit is turned off, and is greater than a second threshold value so that the functional unit operates.

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