Illuminating system

Abstract

The utility model relates to the technical field of lighting control, in particular to a lighting system, which comprises a power supply unit, a lighting device and a controller, and is characterized in that the power supply unit comprises a control unit, a constant current control circuit and a constant voltage control circuit; the control unit comprises a first input end, a second input end, a first output end and a second output end, the first output end is connected with the constant current control circuit, and the second output end is connected with the constant voltage control circuit; the lighting device comprises a positive pole connecting line, a negative pole connecting line and n lamps, and each lamp is connected between the positive pole connecting line and the negative pole connecting line in parallel. According to the utility model, the current and voltage dual control is combined, so that the lighting system can be protected when the number of lamps changes or even suddenly fails, the lamps can be maintained to continuously illuminate, the safe and stable operation of the circuit is facilitated, and a more reliable lighting environment is provided for a user.

Description

Technical Field

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

[0002] Reference for existing DC powered lighting systems Figure 1 The system consists of a DC constant voltage power supply cabinet, lamps, and a communication local area network. The lamps consist of decentralized single-lamp converters (drivers), decentralized single-lamp controllers, and LED light sources. The power supply cabinet provides a constant DC voltage to all lamps in the lighting circuit. The decentralized single-lamp converters (drivers) within the lamps convert the constant voltage into a constant current to drive the LED light sources. Automatic control of the lighting system occurs when a host computer sends control commands, such as dimming commands, to the decentralized single-lamp controllers via the communication local area network. The decentralized single-lamp controllers then send the dimming commands to the decentralized single-lamp converters (drivers), which then adjust the constant current output to the LED light sources to achieve dimming.

[0003] Furthermore, the stability of lighting scenes is crucial in public places such as outdoor lighting in public venues, airports, and train stations, as well as underground places such as tunnels and passages. These places require stable lighting to maintain safe and smooth passage for people.

[0004] The main problems faced by existing technologies are: 1. When multiple LED lights are connected in parallel in a lighting circuit, the lights often turn on and off irregularly and randomly. Using current constant current control LED lighting systems, when some lights are turned off, the remaining lights may be subject to a higher current load, increasing the risk of lamp overload. 2. Lighting stability is poor, and when equipment fails, there is a risk of sudden lighting failure. Utility Model Content

[0005] In order to overcome the above-mentioned defects, the present invention proposes a lighting system, which not only ensures that the lighting system plays a protective role when the number of lamps changes or even sudden failures occur, but also maintains 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.

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

[0007] A power supply unit, a lighting device and a controller, wherein:

[0008] The power supply unit includes a control unit, a constant current control circuit and a constant voltage control circuit;

[0009] The control unit includes a first input end, a second input end, a first output end, and a second output end, the first input end is used to receive electric energy, the second input end is connected to the controller, the first output end is connected to the constant current control circuit, and the second output end is connected to the constant voltage control circuit;

[0010] The lighting device includes a positive electrode connecting wire, a negative electrode connecting wire and n lamps, wherein 2≤n≤N, and N is a natural number greater than or equal to 2;

[0011] The positive connection line is connected to the positive output terminal of the constant current control circuit and the constant voltage control circuit respectively, and the negative connection line is connected to the negative output terminal of the constant current control circuit and the constant voltage control circuit respectively;

[0012] Each of the lamps is connected in parallel between the positive connecting line and the negative connecting line.

[0013] Furthermore, the constant current control circuit includes: a first resistor, a second resistor, a third resistor, a first switch tube and a first capacitor;

[0014] 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 switching tube, the first end of the first switching 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 switching tube and grounded.

[0015] Furthermore, the first switch tube includes a triode or a MOS field effect tube.

[0016] Furthermore, the first switch tube is a triode, the control end of the first switch tube is the base, the first end of the first switch tube is the collector, and the second end of the first switch tube is the emitter.

[0017] Furthermore, the first switch tube is a MOS field effect tube, the control end of the first switch tube is a gate, the first end of the first switch tube is a drain, and the second end of the first switch tube is a source.

[0018] Furthermore, the constant voltage control circuit includes: a fourth resistor, a fifth resistor, a second switching 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 switching tube, the first end of the second switching 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 switching tube and grounded.

[0019] Furthermore, the second switch tube includes a triode or a MOS field effect tube.

[0020] Furthermore, the second switch tube is a triode, the control end of the second switch tube is the base, the first end of the second switch tube is the collector, and the second end of the second switch tube is the emitter.

[0021] Furthermore, 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 second switch tube is a source.

[0022] 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 of distance from the power supply unit from near to far.

[0023] Furthermore, the positive electrode connecting wire includes a first positive electrode wire and a second positive electrode wire;

[0024] One end of the first positive line is connected to the positive output terminals of the constant current control circuit and the constant voltage control circuit respectively, the other end of the first positive line is connected to the second positive line, and the second positive line is connected to the first end of each of the lamps;

[0025] The negative electrode connecting line includes a first negative electrode line and a second negative electrode line;

[0026] The first negative line is connected to the second end of each lamp, one end of the second negative line is connected to the negative output ends of the constant current control circuit and the constant voltage control circuit respectively, and the other end of the second negative line is connected to the second end of the nth lamp.

[0027] Furthermore, the positive connection line further includes a third positive line, wherein the third positive line is connected to the first end of each of the first lamp to the i-th lamp, 1≤i≤N; the second positive lines between the first lamp to the i-th lamp are connected in parallel with the third positive line;

[0028] The negative connection line also includes a third negative line, wherein the third negative line is connected to the second end of the jth lamp to the nth lamp respectively, 1≤j≤N; the first negative line between the jth lamp to the nth lamp is connected in parallel with the third negative line.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Furthermore, the lamp includes an LED lamp.

[0033] Furthermore, there are multiple power supply units, and the power supply units are connected in parallel.

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

[0035] In implementing the technical solution of the present invention, a constant current control circuit and a constant voltage control circuit are used to perform constant current and constant voltage control respectively. When the system is normally illuminated, the power supply unit outputs a stable and constant constant voltage, providing a solid power foundation for the entire lighting system.

[0036] This innovative system cleverly integrates constant current control with constant voltage control, effectively protecting against potential threats from both external shocks and internal faults. This dual control combination not only protects the lighting system from changes in the number of lamps or even sudden faults, but also ensures uninterrupted continuous lighting, contributing to circuit safety and stable operation, providing users with a safer and more reliable lighting environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. Those skilled in the art will readily appreciate that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. Furthermore, similar numbers in the figures represent similar components, where:

[0038] Figure 1 This is a schematic diagram of the main structure of the existing DC power supply lighting system;

[0039] Figure 2 is a schematic diagram of the main structure of a lighting system according to an embodiment of the present utility model;

[0040] Figure 3 1 is a schematic diagram of the main structure of a power supply unit according to an embodiment of the present utility model;

[0041] Figure 4 1 is a schematic diagram of the main structures of a lighting system according to an embodiment of the present utility model, including X11, X12, X21 and X22;

[0042] 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 utility model. DETAILED DESCRIPTION

[0043] Some embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0044] Reference Figure 2 , the utility model provides a lighting system, comprising:

[0045] A power supply unit, a lighting device and a controller, wherein the power supply unit includes a control unit, a constant current control circuit and a constant voltage control circuit.

[0046] Figure 2 The figure shows two power supply units connected in parallel, namely power supply unit 1 (P1) and power supply unit 2 (P2). This does not mean that this is the only 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. The power supply unit is a constant current and constant voltage dual-controlled power supply. Each power supply unit includes a control unit 3, a constant current control circuit, and a constant voltage control circuit.

[0047] The control unit 3 is a microcontroller, for example, a single chip microcomputer.

[0048] After receiving the control signal, the control unit 3 switches the system to constant current or constant voltage control and controls the corresponding output signal size. Specifically, the control unit 3 includes a first input terminal 3-1, a second input terminal 3-2, a first output terminal 3-3 and a second output terminal 3-4.

[0049] The first input terminal 3 - 1 is used to receive electrical energy, and can receive DC or AC electrical energy and output DC power.

[0050] The second input terminal 3-2 is connected to the controller 4. The control unit 3 is in communication connection with the controller 4. In one embodiment, the control unit and the controller are in communication connection via RS485 or CAN to transmit control signals of the controller.

[0051] The first output terminal 3-3 is connected to the constant current control circuit, and the second output terminal 3-4 is connected to the constant voltage control circuit. The constant current control circuit is used to output a constant current, and 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 selectively operate while the other is shut down. The power supply unit can be controlled to 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.

[0052] The lighting device includes a positive connecting wire, a negative connecting wire and n lamps, Figure 2 The n lamps include: LP1 (7-1), LP2 (7-2), LPn-1, LPn (7-n), where 2≤n≤N, and N is a natural number greater than or equal to 2.

[0053] The positive connection line 5 is connected to the positive output terminal of the constant current control circuit and the constant voltage control circuit respectively, and the negative connection line 6 is connected to the negative output terminal of the constant current control circuit and the constant voltage control circuit respectively;

[0054] Each of the lamps is connected in parallel between the positive connection line 5 and the negative connection line 6 .

[0055] In one embodiment, the controller is a chopper controller.

[0056] The controller establishes a connection between the constant current and constant voltage dual-controlled power supply P1 and the constant current and constant voltage dual-controlled power supply P2. The controller's primary responsibility is to send commands to the constant current and constant voltage dual-controlled power supplies. This allows the controller to effectively control whether the power supply is constant voltage or constant current and adjust the output voltage or current, ensuring optimal power supply for the entire system.

[0057] The controller adjusts the output strategy in time to ensure the optimization of lighting effects and energy efficiency, avoid system failures when a short circuit occurs in the system, and maintain lighting.

[0058] In one embodiment, the controller is of TGK model.

[0059] This utility model transforms traditional constant current or constant voltage control lighting systems into a dual-control system that activates constant current or constant voltage control based on the lighting fixture's state. This dual control system not only protects the lighting system against changes in the number of lamps or even sudden failures, but also maintains uninterrupted lighting, contributing to circuit safety and stable operation, providing users with a safer and more reliable lighting environment.

[0060] In one embodiment, referring to Figure 3 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.

[0061] 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 an operating 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 to ground GND.

[0062] In one embodiment, the first switch tube T1 includes a transistor or a MOS field effect tube.

[0063] In one application scenario, the first switch tube is a triode, the control end of the first switch tube T1 is the base, the first end of the first switch tube T1 is the collector, and the second end of the first switch tube T1 is the emitter.

[0064] In one 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.

[0065] In one embodiment, still referring to Figure 3 The constant voltage control circuit includes: a fourth resistor R21, a fifth resistor R22, a second switch tube T2 and a second capacitor C2.

[0066] 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 the first end of the fifth resistor R22, a second end of the fifth resistor R22 is connected to the first end of the second capacitor C2, and a second end of the second capacitor C2 is connected to the second end of the second switch tube T2 and is grounded.

[0067] In one embodiment, the second switch tube includes a triode or a MOS field effect tube.

[0068] In one application scenario, the second switch tube is a triode, the control end of the second switch tube is the base, the first end of the second switch tube is the collector, and the second end of the second switch tube is the emitter.

[0069] 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.

[0070] The following example illustrates the constant voltage and constant current control method.

[0071] When constant voltage control is activated, constant current control needs to be turned off simultaneously. The controller sends a constant voltage control command, and the control unit (MCU) receives the constant voltage control signal via CAN. The constant voltage control circuit outputs a constant voltage signal according to the constant voltage control command, 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, thereby turning off T1. At this time, the intersection of R12, R11, and the input end of T1 is recorded as A1, which is at a high level, outputting a high level of the working power supply VCC. In this way, the constant current output part is turned off, and the power supply unit only outputs the constant voltage.

[0072] When constant current control is enabled, constant voltage control must be disabled simultaneously. The controller sends a constant current control command, and the control unit, the MCU, receives the constant current control signal via CAN. The constant current control circuit then outputs a constant current signal based on the constant current control command. This means the control unit outputs a PMW1 signal at the first end of R11. Simultaneously, the control unit outputs a PMW low-level signal at the first end of R21, causing T2 to enter a high-impedance state and a zero voltage output. This shuts off the constant voltage output, leaving the power supply unit outputting only a constant current.

[0073] In summary, the PWM pulse width controls the on / off state. When T1 is in a steady-state off-state, constant voltage control is used. When T2 is in a steady-state high-resistance state, constant current control is used. When constant current control is in effect, the control input terminal of the constant voltage control circuit is in a high-resistance state. When constant voltage control is in effect, the control input terminal of the constant current control circuit is in a high-level state.

[0074] In one embodiment, the lamp 7 includes an LED lamp.

[0075] In one embodiment, referring to Figure 2-Figure 3 The n lamps include a first lamp 7-1, a second lamp 7-2, to an nth lamp 7-n 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.

[0076] In one embodiment, the first lamp, the second lamp, and the nth lamp are the first LED lamp, the second LED lamp, and the nth LED lamp. The first 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.

[0077] One end of the positive connection line 5 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 is connected to the positive ports of the first lamp, the second lamp, and finally the nth lamp in sequence.

[0078] One end of the negative connection line 6 is connected to the negative output terminal of the power supply unit, and the other end is connected to the negative ports of the first lamp, the second lamp, and finally the nth lamp in sequence.

[0079] In one embodiment, the wiring method is further improved, referring to Figure 4 The positive connection line 5 includes a first positive line 5-1 (X11) and a second positive line 5-2 (X12). One end of the first positive line X11 is connected to the positive output terminals of the constant current control circuit and the constant voltage control circuit, i.e., the positive output terminal of the power supply unit, respectively. The other end of the first positive line X11 is connected to the second positive line X12. The second positive line X12 is connected to the first end (positive port) of each of the lamps (the first lamp, the second lamp, up to the nth lamp).

[0080] The negative connection line 6 includes a first negative line 6-1 (X22) and a second negative line 6-2 (X21). The first negative line X22 is connected to the second end of each lamp (the first lamp, the second lamp, and so on). One end of the second negative line X21 is connected to the negative output terminals of the constant current control circuit and the constant voltage control circuit, respectively. The other end of the second negative line X21 is connected to the second end (negative terminal) of the nth lamp.

[0081] In this way, through Figure 4 The improved wiring method balances the voltage drop of the lighting device circuit to a certain extent. In comparison, although the voltage drop of the middle lamp is slightly larger and the brightness of the lamp is slightly lower, the deviation generally does not exceed -10%.

[0082] With the increasing scale of buildings and the diversification of lighting needs, how to ensure that lamps in every corner can obtain stable voltage supply to achieve uniform and comfortable lighting effects has become an urgent problem to be solved. Figure 4 The improved wiring method shown here significantly alleviates the problem of uneven voltage distribution within lighting installations. By cleverly adjusting the wiring layout and connection method, this method effectively reduces the voltage drop caused by resistance during long-distance power transmission. Especially for centrally located lamps, although their voltage is still affected to some extent due to their distance from the power center, this effect is significantly reduced compared to traditional wiring methods. According to actual measurement data, with this improved wiring method, the voltage deviation of centrally located lamps is generally controlled within -10%, which is a completely acceptable range for most lighting applications.

[0083] 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, enhance lighting quality and energy efficiency.

[0084] In one embodiment, referring to Figure 5 The wiring arrangement is further improved. The positive connection line also includes a third positive line 5-3 (X13), wherein the third positive line X13 is connected to the first end of each of the first lamp through the i-th lamp, where 1≤i≤N. The second positive line X12 between the first lamp through the i-th lamp is connected in parallel with the third positive line X13.

[0085] The negative electrode connection line also includes a third negative electrode line 6-3 (X23), wherein the third negative electrode line X23 is connected to the second end of the jth unit to the nth unit respectively, 1≤j≤N; the first negative electrode line X22 between the jth lamp to the nth lamp is connected in parallel with the third negative electrode line X23.

[0086] 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.

[0087] 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.

[0088] For example, a lighting device includes 10 lamps, where n=10 and i=j=5. The 10 lamps are connected in parallel in descending order of distance from the power supply unit: the first lamp, the second lamp, the third lamp, the fourth lamp, the ninth lamp, and the tenth lamp. The third positive line X13 is connected to the first ends (positive terminals) of the first through fifth lamps, respectively. The third negative line X23 is connected to the second ends (negative terminals) of the sixth through tenth lamps, respectively.

[0089] The i lamps connected to the third positive line X13 include: the first lamp, the second lamp, the third lamp to the fifth lamp.

[0090] The j lamps connected to the third negative line X23 include: the sixth lamp, the seventh lamp, the eighth lamp, to the tenth lamp.

[0091] 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.

[0092] In one application scenario, n is 7. The third positive line X13 is connected to the first ends (positive terminals) of the first, second, third, and fourth lamps, respectively. The third negative line X23 is connected to the second ends (negative terminals) of the fifth, sixth, and seventh lamps, respectively. The number of lamps in the front half of the system, which is closer to the power supply unit, is one more than the number of lamps in the rear half, which is farther away from the power supply unit.

[0093] 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.

[0094] In one application scenario, n is 9. The third positive line X13 is connected to the first end (positive terminal) of the first, second, third, and fourth lamps, respectively. The third negative line X23 is connected to the second end (negative terminal) of the fifth, sixth, and ninth lamps, respectively. The number of lamps in the front half of the system, which is closer to the power supply unit, is one less than that in the rear half, which is farther away from the power supply unit.

[0095] When n is an odd number, although the front and rear lamps are not completely identical, the difference is only 1. 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.

[0096] This embodiment optimizes light source layout and effects, particularly for long-distance, long-line lighting scenarios such as tunnels and public lighting. When n is an odd number, although the front and rear lamp configurations are not completely mirror-symmetrical, there are only slight differences, which only account for a single lamp. In practical applications, due to various limitations (such as installation space and cost budget), it is difficult to achieve a completely symmetrical lamp layout. Therefore, "lamp i and lamp j" can be used as the middle lamp and lighting circuit design and adjustment can be carried out accordingly.

[0097] Relative to Figure 4 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 end lamps, and significantly improving the uniformity of the overall lamp.

[0098] The present invention can shunt the current at both ends of the parallel LED lamp 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, and meeting the constant current and voltage equalization requirements of the LED lamp.

[0099] This lighting device, through its ingenious design, achieves a constant current and voltage-sharing effect when LED lamps are connected in parallel, significantly improving the stability and efficiency of the lighting system. The key lies in the introduction of a third positive line X13 and a third negative line X23. These two special connecting lines play a crucial role in the LED lamp assembly.

[0100] In traditional parallel LED light sets, slight differences between the individual LEDs (such as varying internal resistance) often cause the middle LED to experience a significant voltage drop when current flows through it, impacting its luminous efficiency and lifespan. The new X13 and X23 connecting wires effectively split the current across the parallel LEDs.

[0101] Specifically, the X13 and X23 cables act as current shunts, ensuring that the voltage across each LED is consistent. This design not only reduces voltage drops in the middle LED, but also ensures that every LED in the entire cluster receives a stable and uniform current supply.

[0102] Furthermore, the present invention 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 lights can be achieved by properly configuring the X13 and X23 connecting wires.

[0103] In one embodiment, there are multiple power supply units, and the power supply units are connected in parallel. Figure 2 、 4 In -5, two power supply units P1 and P2 are connected in parallel.

[0104] The lighting system of this utility model utilizes a centralized DC drive system, providing either constant voltage or constant current power supply. At the start of lighting, the power supply unit is controlled to maintain constant voltage to ensure circuit stability. If the current drawn by the lighting devices in the system is detected to be excessive, the controller switches from constant voltage to constant current to optimize power supply performance. This approach offers the advantage that, in the event of a short circuit, the maximum short-circuit current is limited to within the constant current output by the power supply unit.

[0105] The present invention also provides a method for lighting control using the above lighting system, comprising:

[0106] S1, controls the constant current control circuit of the power supply unit to output a constant current through the controller;

[0107] S2, the lighting device receives the constant current;

[0108] S3, obtaining an output voltage value corresponding to the constant current control circuit outputting the constant current;

[0109] S4, using the acquired 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;

[0110] S5, the lighting device receives the constant voltage and illuminates.

[0111] In one embodiment, in step S1, controlling the constant current control circuit of the power supply unit to output a constant current by the controller includes:

[0112] S11, obtaining the number n of lamps of the lighting device;

[0113] S12, obtaining the rated power and rated voltage of the lamp;

[0114] S13, obtaining a rated current of the lighting device based on the number n, the rated power, and the rated voltage;

[0115] S14, controlling the constant current control circuit to output a constant current through the controller according to the rated current.

[0116] With this constant current, the output voltage value corresponding to the constant current control circuit outputting the constant current can be obtained through measurement and collection.

[0117] In an application scenario, the lamps are LED lamps, and the number of LED lamps is 10 (n=10). Figure 2 In the system, the rated power of a single LED lamp is 220W, and the rated voltage is DC 220V. Calculation shows that the rated current of a single LED lamp is 1A.

[0118] The total current of 10 LED lights is 10A.

[0119] The controller controls the constant current control circuit to output a constant current of 10A. The output voltage of the constant current control circuit at 10A is measured to be 230V. 230V is generated by 10A and is frequently measured. 230V is the actual voltage with line loss. This voltage is used as the reference for constant voltage control. 230V is stored and used as the control value for 100% of the rated constant voltage output of the power supply unit.

[0120] In one embodiment, the method further comprises:

[0121] S6, 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;

[0122] S7, the constant voltage control circuit outputs a constant voltage according to the instruction.

[0123] In one application scenario, the lamps are LED lamps. There are 10 LED lamps. The rated current of each 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.

[0124] 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 lower, with 230V as the actual 100% rated voltage reference. After adjustment, the output constant voltage adjustment value is 229V.

[0125] After turning off the five lamps, the controller controls the constant voltage control circuit of the power supply unit to lower the output constant voltage, and the output constant voltage adjustment value is 228V after adjustment.

[0126] The above voltage adjustment value can be obtained by using a pre-established line current-voltage mapping relationship.

[0127] 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 device; the lighting device receives the constant current and illuminates; the constant current and constant voltage dual-controlled power supply of the power supply unit automatically obtains the voltage and line loss voltage drop of the lighting device and stores them, and uses this voltage value as the 100% control value of the rated constant voltage output of the power supply unit; when the load of the lighting device 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.

[0128] When dimming control is in effect, the controller sends a command of rated constant voltage output and the following control value 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.

[0129] In one embodiment, the method further comprises:

[0130] S8, when it is detected that the current value output by the power supply unit reaches or exceeds the rated current of the lighting device, the power supply unit switches to constant current control and stops constant voltage control.

[0131] In the previous application scenario, S13 , the rated current of the lighting device is calculated to be 10 A, and this value is used as the upper limit of the current.

[0132] 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.

[0133] During the lighting system's constant voltage control process, if the current of the lighting device rises to the critical point of 10A, it will immediately switch to constant current power supply mode to ensure that the system does not overload. This allows the system to intervene immediately at the slightest increase in current, effectively preventing overload and building a solid protective wall for the lighting device.

[0134] This utility model immediately triggers a switch to constant current power supply mode when it detects signs of overload in the lighting circuit where the lamp resides. In constant current power supply mode, the system ensures that the lamp continues to illuminate while strictly limiting the current to a preset safety range. This ensures continuous and stable lighting while preventing irreversible damage to the lamp caused by excessive current.

[0135] Therefore, the constant current power supply switching mechanism in the constant voltage control of the lighting system of the present invention is undoubtedly a significant technological innovation. It not only improves the safety and stability of the lighting system, but also significantly extends the service life of the lamps and reduces maintenance costs.

[0136] In one embodiment, in S8, the power supply unit switches to constant current control and stops constant voltage control, including:

[0137] 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.

[0138] Specifically, in the previous application scenario, in S13 , the rated current of the lighting device is calculated to be 10 A, and this value is used as the upper limit of the current.

[0139] The controller sends a 10A constant current output instruction to the control unit of the power supply unit through the 485 serial port or CAN bus. After receiving the instruction, the control unit controls the constant current control circuit to output 10A and controls the constant voltage control circuit to 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 into a high-impedance state and cut off.

[0140] The core of this utility model lies in implementing precise constant voltage and constant current control strategies for the lighting system. Specifically, when the system is fully operational, the constant voltage control unit in the power supply unit enters operation, outputting a stable and constant voltage, providing a solid power foundation for the entire lighting system. During this phase, the constant current power supply remains silent and does not participate in the distribution and conversion of electrical energy.

[0141] In constant voltage control mode, for example Figure 5 With this wiring method, the lamps within the lighting device, whether LEDs or other light sources, are driven by a constant voltage to emit bright and uniform light. Notably, even if the number of lamps in the lighting device is reduced for any reason (e.g., if a lamp is manually turned off, or if some lamps are damaged or fail), the voltage across each lamp remains consistent, so the lighting effect of the entire lighting system is not significantly affected. The ingenuity of this design lies in ensuring the stability and reliability of the lighting system in the face of unexpected situations.

[0142] However, the stable operation of the lighting system is not a one-time thing. In actual applications, as the load increases or the circuit ages, the current of the lighting device may gradually increase, or even exceed the preset safety threshold. At this time, the system faces the risk of overload. To this end, the utility model introduces an intelligent monitoring and switching mechanism. When it is detected that the current of the lighting device exceeds a certain limit, this mechanism will respond quickly and automatically switch the power supply unit from constant voltage control mode to constant current control mode. In this mode, the originally silent constant current control part starts working, and it outputs a constant and controlled constant current to ensure that the lighting system can 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.

[0143] This new design utilizes precise constant voltage and current control strategies to ensure stable operation of the entire lighting system, preventing lamps from extinguishing and maintaining continuous illumination, regardless of changes in the number of lamps in the lighting device. This stability not only enhances the user experience but also significantly reduces safety risks associated with system failures.

[0144] The introduction of intelligent monitoring and switching mechanisms makes this utility model highly automated and intelligent. It 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.

[0145] In one embodiment, there are multiple power supply units.

[0146] When there are multiple power supply units, they can be used simultaneously or some can be used selectively, with the rest being kept as standby.

[0147] In one embodiment, the multiple power supply units include a primary power supply and a backup power supply. There can be one or more primary power supplies, with backup power supplies also connected to the system. In modern power systems, the stability and reliability of power supply units are crucial, especially in applications requiring continuous power, such as tunnel lighting. This embodiment utilizes a combination of primary and backup power supplies to ensure uninterrupted lighting.

[0148] In one application scenario, three power supply units (P1, P2, and P3) are connected in parallel, with P3 serving as a backup and the other two (P1 and P2) in full operation. Each power supply outputs 1 kW, for a total output of 2 kW. The lighting fixture contains 10 lamps. If either P1 or P2 fails while the other is functioning normally, the total output power is reduced to 1 kW, reducing the brightness of the fixture by half. Despite this reduction, illumination is still maintained. When backup power supply P3 comes into operation, the lighting remains at 2 kW, ensuring optimal lighting.

[0149] In one embodiment, when the multiple power supply units are used simultaneously,

[0150] Collect the current value output by each power supply unit;

[0151] Obtaining a current output mean value according to the current value;

[0152] Based on the current output mean value, the voltage value output by each power supply unit is adjusted by the controller.

[0153] In this embodiment, the current average is targeted to adjust the voltage value output by each power supply unit to balance the output of the power supply units.

[0154] Reference Figure 5 , uses two constant current and constant voltage dual-controlled power supply units, which 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 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; conversely, 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.

[0155] The advantage of this design approach is that it effectively achieves voltage balancing 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 can also cause crosstalk and oscillation failures between individual power supply units. This approach, based on current sampling and voltage regulation, can significantly reduce the overall cost of the power supply system and improve system stability and reliability. In addition, this intelligent control strategy can 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.

[0156] Innovations in power control technology are crucial for improving equipment efficiency and ensuring circuit safety. The unique control strategy employed in this utility model represents a significant breakthrough in this area. This utility model implements constant voltage control within the lighting system, ensuring that the voltage across the lighting fixture remains constant within a preset range. Voltage stability is crucial for lighting systems with multiple lamps connected in parallel, as it directly impacts the luminous efficiency and uniformity of the lamps.

[0157] In addition to constant voltage control, the system cleverly incorporates a constant current control strategy, effectively protecting against potential threats posed by external shocks and internal faults. When a short circuit occurs, the short-circuit current can instantly surge to dozens of times the rated current or even higher, causing devastating damage to the circuit system. However, the constant current control strategy of this utility model responds quickly, limiting the short-circuit current to a preset constant current value, effectively preventing damage to the circuit system caused by high current shocks.

[0158] This dual control combination not only protects the lighting system against changes in the number of lamps or even sudden failures, but also ensures uninterrupted lighting, promoting circuit safety and stable operation, and providing users with a safer and more reliable lighting environment. This utility model is highly effective in home, commercial, and industrial lighting. It not only improves the overall efficiency and stability of the lighting system, but also reduces maintenance costs and safety risks, providing users with a more convenient, efficient, and safe lighting experience.

[0159] 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 will understand that in order to achieve the effect 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.

[0160] Thus 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 readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A lighting system, characterized in that: include: A power supply unit, a lighting device and a controller, wherein: The power supply unit includes a control unit, a constant current control circuit and a constant voltage control circuit; The control unit includes a first input end, a second input end, a first output end, and a second output end, the first input end is used to receive electric energy, the second input end is connected to the controller, the first output end is connected to the constant current control circuit, and the second output end is connected to the constant voltage control circuit; The lighting device includes a positive electrode connecting wire, a negative electrode connecting wire and n lamps, wherein 2≤n≤N, and N is a natural number greater than or equal to 2; The positive connection line is connected to the positive output terminal of the constant current control circuit and the constant voltage control circuit respectively, and the negative connection line is connected to the negative output terminal of the constant current control circuit and the constant voltage control circuit respectively; Each of the lamps is connected in parallel between the positive connecting line and the negative connecting line.

2. The system according to claim 1, wherein: The constant current control circuit includes: 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 switching tube, the first end of the first switching 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 switching tube and grounded.

3. The system according to claim 2, characterized in that The first switch tube includes a triode or a MOS field effect tube.

4. The system according to claim 3, characterized in that The first switch tube is a triode, the control end of the first switch tube is the base, the first end of the first switch tube is the collector, and the second end of the first switch tube is the emitter.

5. The system according to claim 2, wherein: The first switch tube is a MOS field effect tube, the control end of the first switch tube is a gate, the first end of the first switch tube is a drain, and the second end of the first switch tube is a source.

6. The system according to claim 1 or 2, characterized in that The constant voltage control circuit includes: a fourth resistor, a fifth resistor, a second switching 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 switching tube, the first end of the second switching 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 switching tube and grounded.

7. The system according to claim 6, characterized in that The second switch tube includes a triode or a MOS field effect tube.

8. The system according to claim 7, characterized in that The second switch tube is a triode, the control end of the second switch tube is the base, the first end of the second switch tube is the collector, and the second end of the second switch tube is the emitter.

9. The system according to claim 7, wherein: 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 second switch tube is a source.

10. The system according to claim 1, wherein: 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.

11. The system according to claim 10, wherein: The positive electrode connecting wire includes a first positive electrode wire and a second positive electrode wire; One end of the first positive line is connected to the positive output terminals of the constant current control circuit and the constant voltage control circuit respectively, the other end of the first positive line is connected to the second positive line, and the second positive line is connected to the first end of each of the lamps; The negative electrode connecting line includes a first negative electrode line and a second negative electrode line; The first negative line is connected to the second end of each lamp, one end of the second negative line is connected to the negative output ends of the constant current control circuit and the constant voltage control circuit respectively, and the other end of the second negative line is connected to the second end of the nth lamp.

12. The system according to claim 10, wherein: The positive connection line further includes a third positive line, wherein the third positive line is connected to the first end of each of the first lamp to the i-th lamp, 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 negative connection line also includes a third negative line, wherein the third negative line is connected to the second end of the jth lamp to the nth lamp respectively, 1≤j≤N; the first negative line between the jth lamp to the nth lamp is connected in parallel with the third negative line.

13. The system according to claim 12, wherein: 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.

14. The system according to claim 12, wherein: 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.

15. The system according to claim 12, wherein: 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.

16. The system according to claim 1, wherein: The lamp includes an LED lamp.

17. The system according to claim 1, wherein: There are multiple power supply units, and the power supply units are connected in parallel.

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