Illumination control system and control method

Abstract

The invention relates to the technical field of illumination, and particularly provides an illumination control system and a control method. The lighting control system comprises a power supply unit, a plurality of lighting units which are connected in parallel, and concentrated current adjusting devices which are respectively connected to the lighting units; wherein the power supply unit is used for outputting direct current; each lighting unit comprises a plurality of loads, the loads are connected in parallel, and the lengths of connecting lines of all the loads from the positive electrode output end of the concentrated current adjusting device to the positive electrode of the load to the negative electrode of the load and then to the negative electrode output end of the concentrated current adjusting device are the same; and the concentrated current adjusting device is used for receiving the direct current and controllably adjusting the input current of the corresponding lighting unit so as to supply the input current to the load. According to the invention, a centralized control illumination method is adopted, an existing vulnerable part and a communication local area network which cannot stably save energy for a long time are abandoned, and the illumination effect that all lamps work normally is realized.

Description

Technical Field

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

[0002] Reference for existing DC powered lighting systems Figure 1 It is composed of a DC constant voltage power supply cabinet, lamps, and a communication LAN. The lamps are composed of a dispersed single lamp converter (driver), a dispersed single lamp controller, and an LED light source. The power supply cabinet is responsible for providing a constant DC voltage to all lamps on the lighting circuit, and the dispersed single lamp converter (driver) in the lamp completes the constant voltage conversion to a constant current to drive the LED light source. The lighting system is automatically controlled by the host sending control commands such as dimming commands to the dispersed single lamp controller through the communication LAN, and the dispersed single lamp controller sends the dimming command to the dispersed single lamp converter (driver), and then the dispersed single lamp converter (driver) adjusts the constant current output current to the LED light source to achieve the purpose of dimming.

[0003] The existing technology has the following pain points: (1) The system architecture is complex and the failure rate is high; (2) The dispersed single-lamp converters (drivers) and dispersed single-lamp controllers in the lamps are vulnerable parts, with an average lifespan of 5 years in the industry and high maintenance costs at high altitudes. (3) The bit error rate of control commands sent through the communication LAN will become higher and higher over time, and long-term stable energy saving cannot be achieved.

[0004] It is necessary to develop a new lighting control technology that can solve the pain points of the above-mentioned lighting systems. Summary of the invention

[0005] In order to overcome the above defects, the present invention provides a lighting control system and a control method, which have a simple architecture, a stable dimming and energy-saving effect, and can ensure the normal operation of each lighting fixture.

[0006] In a first aspect, the present invention provides a lighting control system, comprising: a power supply unit, a plurality of lighting units connected in parallel, and a centralized current regulating device respectively connected to each of the lighting units; wherein:

[0007] The power supply unit is used to output direct current;

[0008] Each of the lighting units includes a plurality of loads, wherein the loads are connected in parallel, and the length of the connection line of each load from the positive output terminal of the centralized current regulating device to the positive electrode of the load to the negative electrode of the load and then back to the negative output terminal of the centralized current regulating device is the same;

[0009] The centralized current regulating device is used to receive the direct current and controllably regulate the input current of the corresponding lighting unit to supply the load.

[0010] Furthermore, the concentrated current regulating device is respectively connected to the output end of the power supply unit and the input end of the lighting unit.

[0011] Furthermore, there are at least two concentrated current regulating devices connected to each of the lighting units, wherein the concentrated current regulating devices are connected in parallel.

[0012] Furthermore, the centralized current regulating device comprises a chopper controller, wherein the chopper controller sends a control signal and regulates the input current of the corresponding lighting unit.

[0013] Furthermore, the power supply unit includes a plurality of constant voltage power supplies, wherein the constant voltage power supplies are connected in parallel.

[0014] Furthermore, the system further comprises:

[0015] Controller; wherein the controller is used to send a control signal to the centralized current regulating device to control the magnitude of the input current of the lighting unit.

[0016] Furthermore, the controller is also used to send a control signal to the power supply unit to control the magnitude of the output voltage of the power supply unit.

[0017] Furthermore, when the concentrated current regulating device is short-circuited, the controller sends a control signal to the power supply unit to control the voltage output by the power supply unit according to the current value output by the concentrated current regulating device before the short-circuit.

[0018] In a second aspect, the present invention provides a lighting control method, including the system according to the first aspect, the method comprising:

[0019] Control the power supply unit to output a DC voltage;

[0020] Controlling each centralized current regulating device to receive the DC voltage and regulate the input current of the corresponding lighting unit;

[0021] The lighting unit is controlled to receive the input current of the corresponding lighting unit and illuminate.

[0022] Furthermore, the method for controlling the centralized current regulating device to regulate the input current of the corresponding lighting unit includes:

[0023] Pre-acquire the corresponding relationship between the input current and the input voltage of the corresponding lighting unit of the centralized current regulation device;

[0024] Controlling the output current of the centralized current regulating device according to the set value of the input current of the lighting unit;

[0025] According to the set value of the input current, a voltage following value is obtained based on the corresponding relationship;

[0026] Detect whether the input voltage of the lighting unit deviates from the voltage following value. If so, control the centralized current regulating device to adjust the input current of the lighting unit so that the input voltage of the lighting unit matches the voltage following value.

[0027] Furthermore, the pre-acquiring the corresponding relationship between the input current and the input voltage of the corresponding lighting unit of the centralized current regulating device includes:

[0028] Calculate the rated current of the lighting unit in advance based on the rated power, rated voltage and number of loads in the lighting unit;

[0029] respectively setting the input current of the lighting unit to be less than or equal to the rated current, and recording the input voltage of the corresponding lighting unit;

[0030] A corresponding relationship is obtained according to the set input current of the lighting unit and the recorded input voltage.

[0031] Further, the respectively setting the input current of the lighting unit to be less than or equal to the rated current and recording the input voltage of the corresponding lighting unit comprises:

[0032] Setting the input current of the lighting unit to be equal to the rated current, and recording the corresponding input voltage of the lighting unit;

[0033] When the input current of the lighting unit is greater than zero and less than the rated current, the input current of the lighting unit is set according to a preset step size, and the corresponding input voltage of the lighting unit is recorded.

[0034] Further, the detecting whether the input voltage of the lighting unit deviates from the voltage following value, and if so, controlling the centralized current regulating device to adjust the input current of the lighting unit so that the input voltage of the lighting unit matches the voltage following value includes:

[0035] Detect whether the difference between the input voltage of the lighting unit and the voltage following value is greater than a preset threshold value. If so, control the centralized current regulating device to adjust the input current of the lighting unit so that the input voltage of the lighting unit matches the voltage following value.

[0036] Further, the controlling the centralized current regulating device to adjust the input current of the lighting unit so that the input voltage of the lighting unit is consistent with the voltage following value includes:

[0037] Determining whether the input voltage of the lighting unit is greater than the voltage following value;

[0038] If it is greater than, controlling the centralized current regulating device to reduce the input current of the lighting unit so that the difference between the input voltage of the lighting unit and the voltage following value is not greater than a preset threshold value;

[0039] If it is less than, the centralized current regulating device is controlled to increase the input current of the lighting unit so that the difference between the input voltage of the lighting unit and the voltage following value is not greater than a preset threshold.

[0040] The above one or more technical solutions of the present invention have at least one or more of the following beneficial effects:

[0041] In the technical solution for implementing the present invention, the present invention adopts a centralized control system, which combines power supply and control into one, simplifies the complexities, and realizes the normal operation of the lighting of lamps in the system without being affected by line losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] 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:

[0043] Figure 1 It is a schematic diagram of the main structure of the existing DC power supply lighting system;

[0044] Figure 2 is a schematic diagram of the main structure of a lighting control system according to an embodiment of the present invention;

[0045] Figure 3 It is a main structural schematic diagram of a lighting control system according to a comparative example of the present invention. DETAILED DESCRIPTION

[0046] 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.

[0047] Reference Figure 2 The present invention provides a lighting control system, including: a power supply unit, a lighting unit and a centralized current regulating device.

[0048] There are multiple lighting units, and the lighting units are connected in parallel.

[0049] Each of the lighting units is respectively connected to a centralized current regulating device.

[0050] The components of the system are described below.

[0051] First, the power supply unit

[0052] The power supply unit is used to receive DC or AC input, output DC power, and provide a source of electrical energy for the entire system.

[0053] In one embodiment, the power supply unit includes a plurality of constant voltage power supplies, wherein the constant voltage power supplies are connected in parallel.

[0054] In an application scenario, refer to Figure 2 In the system shown, two constant voltage power supplies P1 and P2 are connected in parallel. When the two power supplies work in parallel, the total voltage value they jointly output is Ue. Assuming that the rated power of each constant voltage power supply is 3000 watts, when they work in parallel, the total output power of the system will reach 6000 watts. The advantage of this design lies in its high reliability. Specifically, if during the actual operation, one of the constant voltage power supplies fails for some reason, such as a short circuit or other problems, causing it to be unable to provide power normally, the other constant voltage power supply can still continue to work without any impact. In this way, the entire lighting system can still maintain normal operation, ensuring that the lighting unit can continue to provide the required lighting functions. This parallel configuration not only improves the stability and reliability of the system, but also ensures that in an emergency, the lighting system will not completely fail due to a single point failure, thereby greatly improving the overall performance and safety of the system.

[0055] The lighting unit is described below.

[0056] In one embodiment, each of the lighting units includes a plurality of loads, wherein the loads are connected in parallel, and the length of the connection line of each load from the positive output terminal of the centralized current regulating device to the positive pole of the load to the negative pole of the load and then back to the negative output terminal of the centralized current regulating device is the same.

[0057] It should be noted that the same length here not only includes the situation where the length is completely consistent, but also includes the situation where the length is basically the same, that is, there is a difference in the length of the connection line of each load from the positive output terminal of the concentrated current regulating device to the positive pole of the load to the negative pole of the load and then back to the negative output terminal of the concentrated current regulating device, but the difference is less than the preset error.

[0058] In this way, each load produces the same line voltage drop and line loss.

[0059] In one embodiment, the load is an LED lamp. Under the framework of the present invention, the brightness of the LED lamp can be made consistent.

[0060] There can be multiple lighting units. Figure 2In the example, two lighting branches, i.e., two lighting units, are used for explanation. The first lighting branch is the first lighting unit, including n LED lamps connected in parallel, namely, 1LP1, 1LP2, 1LP3, ..., 1LPn, and the input voltage of the first lighting unit is U1, and the input current is I1. The second lighting branch is the second lighting unit, including n LED lamps connected in parallel, namely, 2LP1, 2LP2, 2LP3, ..., 2LPn, and the input voltage of the first lighting unit is U2, and the input current is I2.

[0061] The number of lighting units is 1-n, where n is a natural number.

[0062] Next, the concentrated current regulating device will be described.

[0063] The centralized current regulating device is different from the existing decentralized current regulating device (converter). In the prior art, each load is connected to a current regulating device (converter), while the centralized current regulating device of the present invention is used to regulate the input current of a lighting unit, thereby realizing centralized control instead of decentralized and individual control.

[0064] In one embodiment, the centralized current regulating device is used to receive the direct current and controllably regulate the input current of the corresponding lighting unit to supply it to the load.

[0065] In one embodiment, the centralized current regulating device is a centralized converter, and the centralized converter is controlled by chopping mode, inverter mode, or frequency conversion mode.

[0066] In one embodiment, the centralized current regulating device is connected to the output end of the power supply unit and the input end of the lighting unit respectively. The output current of the centralized current regulating device is the input current of the lighting unit in which it is located.

[0067] In one embodiment, the centralized current regulation device includes a chopper controller. In this embodiment, the chopper controller is responsible for sending control signals and is capable of regulating the input currents of the corresponding lighting units to ensure that these currents can be effectively supplied to the loads. The chopper controller not only has a control function, but also can accurately regulate the magnitude of the output current, thereby ensuring that the lighting units can operate in an optimal state, while improving the efficiency and stability of the overall system.

[0068] In one application scenario, the centralized current regulation device includes a PWM controller (PWM pulse width modulation) and a diode connected in series, the input end of the PWM controller is connected to the DC output end of the power supply unit, the output end of the PWM controller is connected to the anode of the diode, and the cathode of the diode is connected to the input end of the lighting unit as the output end of the centralized current regulation device.

[0069] In one embodiment, there are at least two centralized current regulating devices connected to each of the lighting units, wherein the centralized current regulating devices are connected in parallel, and a control switch is connected to the branch where each centralized current regulating device is located to control the on and off of the centralized current regulating device in the branch.

[0070] When in use, the two centralized current regulating devices can be put into use at the same time. When one fails, the other is not affected. One can also be used to adjust the input current of the lighting unit and the other is used as a backup. When the centralized current regulating device in use fails, the backup device is immediately put into use.

[0071] Reference Figure 2 The first lighting unit is connected to two parallel centralized current regulating devices, namely 1BT1 and 1BT2. 1BT1 is connected in series with switch 1QF1. When 1QF1 is turned on, 1BT1 is turned on with P1, P2 and the first lighting unit respectively, so that the voltage output by the power supply unit composed of P1 and P2 is adjusted by 1BT1 and 1BT2, and the outputs U1 and I1 make the n lamps 1LP1, 1LP2, 1LP3 to 1LPn work normally.

[0072] 1BT2 is connected in series with switch 1QF2. When 1QF2 is turned on, 1BT2 is turned on with P1, P2 and the first lighting unit respectively, so that the voltage output by the power supply unit composed of P1 and P2 is adjusted by 1BT2 and 1BT2, and the outputs U1 and I1 make the n lamps 1LP1, 1LP2, 1LP3 to 1LPn work normally.

[0073] The second lighting unit is connected to two parallel centralized current regulating devices, namely 2BT1 and 2BT2. 2BT1 is connected in series with switch 2QF1. When 2QF1 is turned on, 2BT1 is turned on with P1, P2 and the second lighting unit respectively, so that the voltage output by the power supply unit composed of P1 and P2 is adjusted by 2BT1 and 2BT2, and the outputs U2 and I2 make the n lamps 2LP1, 2LP2, 2LP3 to 2LPn work normally.

[0074] 2BT2 is connected in series with switch 2QF2. When 2QF2 is turned on, 2BT2 is turned on with P1, P2 and the second lighting unit respectively, so that the voltage output by the power supply unit composed of P1 and P2 is adjusted by 2BT1 and 2BT2, and the outputs U2 and I2 make the n lamps 2LP1, 2LP2, 2LP3 to 2LPn work normally.

[0075] In one embodiment, the system further includes: a controller TGK.

[0076] The controller is used to send a control signal to the centralized current regulating device to control the magnitude of the input current of the lighting unit.

[0077] In this system, a connection is established between the controller and each centralized current regulator. The main responsibility of the controller is to send instructions to each centralized current regulator. These instructions contain the input current information of the lighting units in the branch where each centralized current regulator is located. In this way, the controller can effectively control and adjust the current to ensure that the current supply of the entire system is in the best state.

[0078] The centralized current regulators work according to the instructions issued by the controller. They receive signals from the controller and adjust the output current according to these signals. In this way, the centralized current regulators can ensure that each lighting unit obtains the appropriate current, thereby ensuring the optimization of lighting effects and energy efficiency. Through this collaborative work, the controller and the centralized current regulators jointly ensure the efficient and stable operation of the entire lighting system.

[0079] In one embodiment, the controller is further used to send a control signal to the power supply unit to control the magnitude of the output voltage of the power supply unit.

[0080] Typically, the controller for controlling the power supply unit and the centralized current regulation device is the same.

[0081] In one embodiment, when the centralized current regulating device is short-circuited, the controller sends a control signal to the power supply unit to control the voltage output by the power supply unit according to the current value output by the centralized current regulating device before the short-circuit.

[0082] In one embodiment, when dimming control is required to save energy, the controller TGK sends a dimming command to the centralized current regulating device via an RS485 communication line or a CAN bus or other communication methods, and the centralized current regulating device lowers or raises the output current to control the input current of the lighting unit.

[0083] In an application scenario, the centralized current regulation device of a lighting circuit normally outputs the rated output current I. When a short circuit fault occurs in the centralized current regulation device of the lighting circuit, that is, the input and output voltages of the centralized current regulation device are the same, the controller controls P1 and P2 of the power supply unit to reduce the output voltage until the circuit current drops back to the rated output current I.

[0084] Still refer to Figure 2 The controller TGK is connected to the concentrated current regulating devices 1BT1, 1BT2, 2BT1 and 2BT2 respectively.

[0085] The present invention removes two vulnerable parts, the single-lamp dispersed converter (driver) and the single-lamp dispersed controller, in each lamp in the existing lighting system, and removes the communication local area network. The centralized control method is adopted to combine power supply and control into one, simplifying the complexity.

[0086] The present invention also provides a lighting control method, including the above-mentioned system, the method comprising:

[0087] S1, controls the power supply unit to output DC voltage.

[0088] S2, respectively controlling each centralized current regulating device to receive the DC voltage and regulate the input current of the corresponding lighting unit.

[0089] S3, controlling the lighting unit to receive the input current of the corresponding lighting unit and illuminate.

[0090] In one embodiment, in step S2, the method for adjusting the input current of the lighting unit includes:

[0091] S21, pre-acquire the corresponding relationship between the input current and the input voltage of the lighting unit corresponding to the centralized current regulation device.

[0092] S22, controlling the output current of the centralized current regulating device according to the set value of the input current of the lighting unit.

[0093] S23, obtaining a voltage following value based on the corresponding relationship according to the set value of the input current.

[0094] S24, detecting whether the input voltage of the lighting unit deviates from the voltage following value, and if so, controlling the centralized current regulating device to adjust the input current of the lighting unit so that the input voltage of the lighting unit matches the voltage following value.

[0095] In one embodiment, in step S21, the pre-acquiring the corresponding relationship between the input current and the input voltage of the corresponding lighting unit of the centralized current regulating device includes:

[0096] S211, calculating the rated current of the lighting unit in advance according to the rated power, rated voltage and number of loads in the lighting unit;

[0097] S212, respectively setting the input current of the lighting unit to be less than or equal to the rated current, and recording the input voltage of the corresponding lighting unit;

[0098] S213, obtaining a corresponding relationship according to the set input current of the lighting unit and the recorded input voltage.

[0099] In one embodiment, in step S212, the input current of the lighting unit is respectively set to be less than or equal to the rated current, and recording the input voltage of the corresponding lighting unit includes:

[0100] S2121, setting the input current of the lighting unit to be equal to the rated current, and recording the corresponding input voltage of the lighting unit;

[0101] S2122: When the input current of the lighting unit is greater than zero and less than the rated current, the input current of the lighting unit is set according to a preset step size, and the corresponding input voltage of the lighting unit is recorded.

[0102] In one embodiment, in step S24, detecting whether the input voltage of the lighting unit deviates from the voltage following value, and if so, controlling the centralized current regulating device to adjust the input current of the lighting unit so that the input voltage of the lighting unit matches the voltage following value includes:

[0103] S241, detecting whether the difference between the input voltage of the lighting unit and the voltage following value is greater than a preset threshold;

[0104] S242: If it is greater than, control the centralized current regulating device to adjust the input current of the lighting unit so that the input voltage of the lighting unit matches the voltage following value.

[0105] In one embodiment, in step S24, controlling the centralized current regulating device to adjust the input current of the lighting unit so that the input voltage of the lighting unit matches the voltage following value includes:

[0106] It is determined whether the input voltage of the lighting unit is greater than the voltage following value.

[0107] If it is greater, the centralized current regulating device is controlled to reduce the input current of the lighting unit so that the difference between the input voltage of the lighting unit and the voltage following value is no greater than a preset threshold.

[0108] If it is less than, the centralized current regulating device is controlled to increase the input current of the lighting unit so that the difference between the input voltage of the lighting unit and the voltage following value is not greater than a preset threshold.

[0109] The adjustment method of the present invention is described below in conjunction with application scenarios.

[0110] Still refer to Figure 2 The constant voltage power supply P1 and the constant voltage power supply P2 are connected in parallel to output a stable and reliable adjustable constant voltage supply voltage. The positive poles of the lamps LP on the lighting circuit are connected in parallel, and the negative poles of the lamps LP are connected in parallel. The centralized current regulating devices BT1 and BT2 are connected in parallel to output, and the output positive pole is connected to the first lamp 1LP1, and the output negative pole is connected to the last lamp 1LPn.

[0111] Since the power, length and wire diameter of each lighting circuit are mostly different, the voltage drop (line loss) of the line is also different, while the terminal voltage of the lamp is the same when it is working normally. This requires that the power supply voltage of each lighting circuit should be adaptive to the actual voltage drop of the circuit, and this voltage drop changes with the circuit current. The centralized current regulator BT is connected in series between the constant voltage power supply cabinet and the lamp to achieve the above regulation.

[0112] After building the above system architecture, commissioning is required before commissioning. Figure 2 In the example, the first lighting unit is used as an example.

[0113] First, the rated current of the lighting unit is calculated according to the rated power, rated voltage and number of the loads in the lighting unit. n = 15, the load has 15 LED lamps, namely 1LP1, 1LP2, 1LP3....., 1LP10, 1LP11....., 1LP15, and the rated power of a single lamp is 31w. The total rated power of the 15 loads of the first lighting unit is 31 watts*15=465 watts. The rated voltage DC of a single LED lamp is 252 volts. The rated current (100% current adjustment amplitude) is calculated to be: 1.85A. Therefore, the rated current of the first lighting unit is 1.85 amperes.

[0114] After the system was put into use, actual tests were carried out on site. The voltage value corresponding to each step in the current regulation range of 5%-100% was tested with a step size of 5% for the current regulation.

[0115] Figure 2 The input current value I1 of the first lighting unit is the set value, the input voltage value U1 of the first lighting unit is the voltage value detected under the set current, and the data acquisition results are shown in Table 1. In Table 1, the dimming amplitude is the amplitude of different current adjustments; the power supply voltage (V) is the voltage Ue output by the constant voltage power supply P1 and P2, the 465W lamp voltage (V) is the recorded input voltage value U1 of the first lighting unit, and the current (A) is the set input current value I1 of the first lighting unit.

[0116] Table 1 Input voltage values ​​recorded and input current values ​​set for the first lighting unit

[0117]

[0118]

[0119] In this way, the data in Table 1 constitutes a corresponding relationship between the input current I1 of the first lighting unit and the input voltage U1 of the first lighting unit.

[0120] When the system is actually operating, the input current I1 of the first lighting unit is set to 1.62 amperes. From the above corresponding relationship, it can be seen that when I1 is 1.62 amperes, the corresponding voltage follower value U1 is 249.84 volts, which is the reference value for voltage detection.

[0121] Set the centralized current regulator BT1 and BT2 to output I1 in parallel at 1.62 amperes. During the lighting operation, detect in real time whether the input voltage of the first lighting unit is 249.84 volts. If so, maintain the constant current output of the centralized current regulator at 1.62 amperes. If it is detected that the input voltage of the first lighting unit deviates from 249.84 volts, the controller controls the current output by the centralized current regulator. The specific adjustment process is:

[0122] Scenario 1: Three of the 15 lamps in the first lighting unit are broken.

[0123] At this time, the input voltage of the first lighting unit is detected to be 252 volts. 252 The difference between the measured voltage of 252 volts and the monitored voltage following value of 249.84 volts is greater than the preset threshold value, and the centralized current regulating device is controlled to adjust the input current of the lighting unit so that the input voltage of the lighting unit matches the voltage following value. Since the measured 252 volts is greater than the target value of 249.84 volts, the controller TGK controls the I1 output of the centralized current regulating devices BT1 and BT2 in parallel to decrease until the input voltage of the first lighting unit is detected to fall back to 249.84 volts, at which time I1 is 1.3 amperes, and the centralized current regulating device is continued to be controlled to output a constant current of 1.3 amperes.

[0124] Scenario 2: Three more lights are added to the 15 lights in the first lighting unit.

[0125] It is detected that the input voltage of the first lighting unit is 246 volts. The difference between the measured 246 volts and the monitored voltage following value of 249.84 volts is greater than the preset threshold. The centralized current regulating device is controlled to adjust the input current of the lighting unit so that the input voltage of the lighting unit matches the voltage following value.

[0126] Since the measured 246 volts is less than the target value of 249.84 volts, the controller TGK controls the centralized current regulating devices BT1 and BT2 to increase the parallel output I1 until it detects that the input voltage of the first lighting unit has risen back to 249.84 volts. At this time, I1 is 1.9 amperes, and the centralized current regulating device continues to be controlled to output a constant current of 1.9 amperes (as the number of lamps increases to 18, the total rated power increases accordingly).

[0127] The present invention adopts a regulation method of first constant current control and then constant voltage control, and other lighting units control the centralized current regulation device of each lighting unit with reference to the above process.

[0128] In addition, when a short-circuit fault occurs in the centralized current regulating device of a lighting circuit, the voltage of the circuit rises, that is, the input and output voltages of the centralized current regulating device are the same, and the lamp will be over-powered. At this time, the controller controls the power supplies P1 and P2 through the RS485 communication port to reduce the output voltage until the circuit current drops back to the rated output current I.

[0129] The present invention adopts a unique control strategy, firstly ensuring the stability of the circuit through constant current control. On this basis, constant voltage control is further implemented 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 centralized regulating device. This is in sharp contrast to the traditional pure constant voltage power supply, in which the short-circuit current may reach dozens of times the rated current, thereby causing serious damage to the circuit system. Through the control strategy of the present invention, this high current impact can be effectively avoided, ensuring the safe and stable operation of the circuit.

[0130] The present invention controls the input current value of the lighting unit through a centralized converter, that is, a centralized current regulating device, so that the input voltage value reaches a preset range, and then monitors whether the input voltage value of the lighting unit is stable. If a large fluctuation occurs, the input current of the lighting unit is adjusted according to the input current value of the lighting unit to restore the input voltage value of the lighting unit to the preset range.

[0131] The present invention solves the problem of integrating DC power supply and control of the entire lighting system (hundreds of lamps). During long-distance power supply, there are problems of large lamp loss and line voltage drop, which has been a pain point that has not been solved in the lighting industry for many years.

[0132] The application scenarios of the present invention are mainly public lighting such as urban street lamps. The distance between lamps is 30-50 meters, and the power supply radius is as high as 1000 meters. The resistance of the power supply line is in ohms, which differs by thousands of times, and the cable cross-sections between lamps may also be different, that is, the line resistance between lamps may also be different. In this way, the terminal voltage of lamps connected in parallel on the same power supply cable will have a deviation of ±1%-2%, and the power supply voltage is as high as 450V or even higher, such as 750V. The LED light-emitting chip is 3V, and 150 strings are required to meet the requirements. The present invention adopts an external constant current power supply to combine power supply and control into one to ensure that each lamp will not have an overload failure.

[0133] Through the control method provided by the present invention, the specific relationship between the input current and input voltage of each lighting unit can be pre-measured and determined before the actual lighting operation after the lamp is connected to the cable. Through in-depth understanding and analysis of these relationships, subsequent control operations can be performed more accurately. The advantage of this method is that it can effectively correct the line loss problem during power transmission. This refined control method not only improves the overall performance of the lighting system, but also ensures the efficient use of energy, and has significant economic benefits and social value.

[0134] The present invention is Figure 1 The traditional street lamp decentralized single lamp constant current and constant voltage control system has been innovatively improved, that is, each lamp needs to be equipped with a complex system of single lamp driver power supply, single lamp controller and communication LAN (distribution box - communication LAN - single lamp controller - single lamp driver power supply - light source). Instead, a new system architecture is proposed, which combines DC centralized power supply and loop constant current control into one, that is, DC centralized constant current power supply is used to supply power to the light source.

[0135] This innovative improvement removes the communication LAN, single lamp controller, single lamp driver and other equipment, which significantly reduces the cost of the entire system and greatly simplifies the architecture. At the same time, due to the use of loop constant current power supply and control, dimming and energy saving become very simple, and the reliability of the system is greatly improved.

[0136] In addition, this improvement also brings another significant benefit, which is that the lamp loss is reduced by about 10%. This is because the energy efficiency of the traditional single-lamp driver is about 85%-90%. In addition, since the single-lamp driver and single-lamp controller have hundreds of electronic components, the product life cycle is about 20,000 hours, or 5-6 years. During use, the failure rate increases year by year, which in turn affects the service life of the lamp. The new system architecture removes the above two vulnerable parts, leaving only LED lamp beads for lighting.

[0137] Comparative Example 1

[0138] Reference Figure 3 , the architecture of comparative example 1 is similar to that of the present invention Figure 2 The only difference between the shown architectures is that the length of the connection line of each load in the lighting unit of comparative example 1 from the positive output terminal of the centralized current regulating device to the positive electrode of the load to the negative electrode of the load and then back to the negative output terminal of the centralized current regulating device is different.

[0139] Although Example 1 controls the input current value of the lighting unit through a centralized current regulating device to ensure that the voltage value input to the lighting unit can reach a predetermined range, thereby achieving stability of the input voltage of the lighting unit, this method still cannot achieve the effect of completely consistent luminous brightness of each lamp.

[0140] To achieve accurate control of the lamp beads through an external constant current switching power supply, it is necessary to rely on a specific control circuit system. This control circuit system can accurately apply the control signal to each lamp, or even the lamp bead, to achieve the purpose of controlling its brightness. The present invention can also ensure that the brightness of each lamp bead is consistent. Because if the brightness is inconsistent, it will affect the overall lighting effect.

[0141] In addition, the lamp beads of the present invention have a high brightness and a long service life, and the power supply circuit adjusts the output current to achieve the purpose of stepless dimming and energy saving of the lamp beads. In order to achieve this goal, vulnerable parts cannot be used. However, the difficulty of achieving this goal is quite large, and it is difficult to take both into account. Therefore, how to extend the service life of the lamp while ensuring the brightness is an extremely challenging technical problem. In order to overcome this problem, the present invention combines an external centralized current regulator with the circuit design of a specific lamp to find a method that can both ensure the consistent brightness of the lamp and extend its service life, including a method in which the power supply circuit adjusts the output current to achieve stepless dimming and energy saving of the lamp. This will greatly promote the development of my country's lighting industry.

[0142] Through the design of the present invention, the life of the lamp beads in the lamp is as high as 50,000-80,000 hours or more, so the new system not only reduces the loss of the lamp, but also doubles the service life of the lamp to 10-12 years, greatly reducing the frequency of high-cost high-altitude maintenance, and the operation and maintenance cost is extremely low. In addition, because the power supply and control cables are connected with direct current, they are isolated and suspended from the ground, and the safety accidents of leakage and electric shock that are easy to occur in traditional AC power supply lighting systems will not occur.

[0143] Therefore, the present invention not only greatly reduces the system cost, simplifies the system architecture, improves the system reliability, but also reduces the loss of lamps, and doubles the service life of lamps, with extremely low operation and maintenance costs, while solving the major problem of power supply safety of lighting systems. It has extremely high practical value and promotion value.

[0144] This change makes large-scale engineering applications possible and achieves significant cost reductions over the entire life cycle of the lighting system.

[0145] 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.

[0146] 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 control system, It is characterized in that include: A power supply unit, a plurality of lighting units connected in parallel, and a centralized current regulating device respectively connected to each of the lighting units; wherein, The power supply unit is used to output direct current; Each of the lighting units includes a plurality of loads, wherein the loads are connected in parallel, and the length of the connection line of each load from the positive output terminal of the centralized current regulating device to the positive electrode of the load to the negative electrode of the load and then back to the negative output terminal of the centralized current regulating device is the same; The centralized current regulating device is used to receive the direct current and controllably regulate the input current of the corresponding lighting unit to supply the load.

2. The system according to claim 1, It is characterized in that The concentrated current regulating device is respectively connected to the output end of the power supply unit and the input end of the lighting unit.

3. The control system according to claim 1, It is characterized in that There are at least two concentrated current regulating devices connected to each of the lighting units, wherein the concentrated current regulating devices are connected in parallel.

4. The system according to claim 1, It is characterized in that The power supply unit includes a plurality of constant voltage power supplies, wherein the constant voltage power supplies are connected in parallel.

5. The system according to claim 1, It is characterized in that The centralized current regulating device comprises a chopper controller, wherein the chopper controller is used to send a control signal and regulate an input current of a corresponding lighting unit.

6. The system according to claim 1, It is characterized in that The system further comprises: a controller; wherein the controller is used to send a control signal to the centralized current regulating device to control the magnitude of the input current of the lighting unit.

7. The system according to claim 6, It is characterized in that The controller is also used to send a control signal to the power supply unit to control the magnitude of the output voltage of the power supply unit.

8. The system according to claim 7, It is characterized in that When the concentrated current regulating device is short-circuited, the controller sends a control signal to the power supply unit to control the voltage output by the power supply unit according to the current value output by the concentrated current regulating device before the short-circuit.

9. A lighting control method, It is characterized in that The method comprises the system of any one of claims 1 to 8, wherein: Control the power supply unit to output a DC voltage; Controlling each centralized current regulating device to receive the DC voltage and regulate the input current of the corresponding lighting unit; The lighting unit is controlled to receive the input current of the corresponding lighting unit and illuminate.

10. The method according to claim 9, It is characterized in that The method for controlling the centralized current regulating device to regulate the input current of the corresponding lighting unit comprises: Pre-acquire the corresponding relationship between the input current and the input voltage of the corresponding lighting unit of the centralized current regulation device; Controlling the output current of the centralized current regulating device according to the set value of the input current of the lighting unit; According to the set value of the input current, a voltage following value is obtained based on the corresponding relationship; Detect whether the input voltage of the lighting unit deviates from the voltage following value. If so, control the centralized current regulating device to adjust the input current of the lighting unit so that the input voltage of the lighting unit matches the voltage following value.

11. The method according to claim 10, It is characterized in that The step of pre-acquiring the corresponding relationship between the input current and the input voltage of the corresponding lighting unit of the centralized current regulating device comprises: Calculate the rated current of the lighting unit in advance based on the rated power, rated voltage and number of loads in the lighting unit; respectively setting the input current of the lighting unit to be less than or equal to the rated current, and recording the input voltage of the corresponding lighting unit; A corresponding relationship is obtained according to the set input current of the lighting unit and the recorded input voltage.

12. The method according to claim 11, It is characterized in that The respectively setting the input current of the lighting unit to be less than or equal to the rated current and recording the input voltage of the corresponding lighting unit comprises: Setting the input current of the lighting unit to be equal to the rated current, and recording the corresponding input voltage of the lighting unit; When the input current of the lighting unit is greater than zero and less than the rated current, the input current of the lighting unit is set according to a preset step size, and the corresponding input voltage of the lighting unit is recorded.

13. The method according to claim 10, It is characterized in that The detecting whether the input voltage of the lighting unit deviates from the voltage following value, and if so, controlling the centralized current regulating device to adjust the input current of the lighting unit so that the input voltage of the lighting unit matches the voltage following value comprises: Detect whether the difference between the input voltage of the lighting unit and the voltage following value is greater than a preset threshold value. If so, control the centralized current regulating device to adjust the input current of the lighting unit so that the input voltage of the lighting unit matches the voltage following value.

14. The method according to claim 13, It is characterized in that The controlling the centralized current regulating device to adjust the input current of the lighting unit so that the input voltage of the lighting unit is consistent with the voltage following value comprises: Determining whether the input voltage of the lighting unit is greater than the voltage following value; If it is greater than, controlling the centralized current regulating device to reduce the input current of the lighting unit so that the difference between the input voltage of the lighting unit and the voltage following value is not greater than a preset threshold value; If it is less than, the centralized current regulating device is controlled to increase the input current of the lighting unit so that the difference between the input voltage of the lighting unit and the voltage following value is not greater than a preset threshold.

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