Illumination system and illumination control method

Abstract

The invention relates to the technical field of lighting control, in particular to a lighting system and a lighting control method.The lighting system comprises a power supply unit, a lighting device and a controller, and 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 invention, current and voltage dual control is combined, so that the lighting system can be protected when the number of the lamps changes or even suddenly fails, the lamps can be maintained to continuously illuminate, safe and stable operation of a circuit is facilitated, and a more reliable lighting environment is provided for a user.

Description

Technical Field

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

[0002] 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] In addition, the stability of lighting scenes is crucial in public places such as outdoor lighting in public venues, airports, train stations, and underground places such as tunnels and passages. These places need to ensure stable lighting to maintain safe and smooth passage of personnel.

[0004] The main problems faced by the existing technology are: 1. When multiple LED lamps are connected in parallel in the lighting circuit, the lamps often turn on and off irregularly and randomly. When the current constant current control LED lamp lighting system is used and some lamps are turned off, the remaining lamps may bear a higher current burden, thereby increasing the risk of lamp overload. 2. The lighting stability is poor. When the equipment fails, there is a problem of sudden lighting failure. Summary of the invention

[0005] In order to overcome the above-mentioned defects, the present invention proposes a lighting system and a control method, which can not only ensure that the lighting system plays a protective role when the number of lamps changes or even sudden failures occur, but also maintain the uninterrupted 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 comprises a first input terminal, a second input terminal, a first output terminal and a second output terminal, the first input terminal is used to receive electric energy, the second input terminal is connected to the controller, the first output terminal is connected to the constant current control circuit, and the second output terminal is connected to the constant voltage control circuit;

[0010] The lighting device comprises 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 switch tube, the first end of the first switch tube is connected to the first end of the second resistor, the second end of the second resistor is connected to a working power supply, the first end of the second resistor is connected to the first end of the third resistor, the second end of the third resistor is connected to the first end of the first capacitor, and the second end of the first capacitor is connected to the second end of the first switch tube and grounded.

[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 a base, the first end of the first switch tube is a collector, and the second end of the first switch tube is an 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 switch tube and a second capacitor; wherein, the first end of the fourth resistor is connected to the second output end of the control unit, the second end of the fourth resistor is connected to the control end of the second switch tube, the first end of the second switch tube is connected to the first end of the fifth resistor, the second end of the fifth resistor is connected to the first end of the second capacitor, and the second end of the second capacitor is connected to the second end of the second switch tube and grounded.

[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 a base, the first end of the second switch tube is a collector, and the second end of the second switch tube is an emitter.

[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 from near to far in terms of distance from the power supply unit.

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

[0028] The negative electrode connection line also includes a third negative electrode line, wherein the third negative electrode line is connected to the second ends of the jth lamp to the nth lamp respectively, 1≤j≤N; the first negative electrode line between the jth lamp to the nth lamp is connected in parallel with the third negative electrode 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] In a second aspect, the present invention provides a method for lighting control using the lighting system according to the first aspect, comprising:

[0035] The constant current control circuit of the power supply unit is controlled by the controller to output a constant current;

[0036] The lighting device receives the constant current;

[0037] Obtaining an output voltage value corresponding to the constant current control circuit when outputting the constant current;

[0038] 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;

[0039] The lighting device receives the constant voltage and illuminates.

[0040] Further, the controlling of the constant current control circuit of the power supply unit by the controller to output the constant current comprises:

[0041] Obtain the number n of lamps of the lighting device;

[0042] Obtaining the rated power and rated voltage of the lamp;

[0043] Based on the number n, the rated power and the rated voltage, a rated current of the lighting device is obtained;

[0044] According to the rated current, the controller controls the constant current control circuit to output a constant current.

[0045] Furthermore, the method further comprises:

[0046] 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;

[0047] The constant voltage control circuit outputs a constant voltage according to the instruction.

[0048] Furthermore, the method further comprises:

[0049] 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.

[0050] Furthermore, the power supply unit switches to constant current control and stops constant voltage control at the same time, comprising:

[0051] 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.

[0052] Furthermore, there are multiple power supply units.

[0053] Furthermore, the multiple power supply units include a main power supply and a backup power supply.

[0054] Furthermore, when the multiple power supply units are used simultaneously,

[0055] Collect the current value output by each power supply unit;

[0056] Obtaining a current output mean value according to the current value;

[0057] Based on the current output mean value, the voltage value output by each power supply unit is adjusted by the controller.

[0058] The above one or more technical solutions of the present invention have at least one or more of the following beneficial effects:

[0059] In the technical solution of the present invention, 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.

[0060] On the basis of constant voltage control, the constant current control strategy is also cleverly integrated to effectively resist the potential threats brought by external shocks and internal faults. When the current of the lighting device exceeds the preset safety threshold, it immediately switches to the constant current control strategy to limit the current within the preset constant current value range, thereby effectively avoiding the damage caused by high current shocks to the circuit system.

[0061] This combination of dual control not only ensures that the lighting system is protected when the number of lamps changes or even sudden failures occur, but also maintains uninterrupted and continuous lighting of the lamps, which is beneficial to circuit safety and stable operation, and provides users with a safer and more reliable lighting environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] 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:

[0063] Figure 1 It is a schematic diagram of the main structure of the existing DC power supply lighting system;

[0064] Figure 2 is a schematic diagram of the main structure of a lighting system according to an embodiment of the present invention;

[0065] Figure 3 is a schematic diagram of the main structure of a power supply unit according to an embodiment of the present invention;

[0066] Figure 4 is a schematic diagram of the main structures of a lighting system including X11, X12, X21 and X22 according to an embodiment of the present invention;

[0067] Figure 5 is a schematic diagram of the main structures of a lighting system including X13 and X23 according to an embodiment of the present invention;

[0068] Figure 6 It is a main flow chart of a lighting control method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0069] 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.

[0070] Reference Figure 2 The present invention provides a lighting system, comprising:

[0071] 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.

[0072] Figure 2 The figure shows the situation where two power supply units are connected in parallel, that is, P1 and P2 are connected in parallel. This does not mean that there is only one implementation method. In actual use, only one power supply unit can be used, or two or more power supply units can be connected in parallel. The power supply unit is a constant current and constant voltage dual-controlled power supply, and each power supply unit includes a control unit, a constant current control circuit, and a constant voltage control circuit.

[0073] The control unit is a microcontroller, such as a single chip microcomputer.

[0074] After receiving the control signal, the control unit switches the system to constant current or constant voltage control and controls the corresponding output signal size. Specifically, the control unit includes a first input terminal, a second input terminal, a first output terminal and a second output terminal.

[0075] The first input end is used to receive electric energy, and can receive direct current or alternating current electric energy and output direct current.

[0076] The second input terminal is connected to the controller. The control unit is connected to the controller for communication. In one embodiment, the control unit is connected to the controller for communication via RS485 or CAN to transmit control signals of the controller.

[0077] 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 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 select one to work and the other to be turned off. The power supply unit can selectively output a constant voltage or a constant current. When the power supply unit outputs a constant voltage, the lighting is controlled by a constant voltage mode, and when the power supply unit outputs a constant current, the lighting is controlled by a constant current mode.

[0078] The lighting device comprises a positive connecting wire, a negative connecting wire and n lamps, Figure 2 LP1, LP2, LPn-1, LPn. Wherein, 2≤n≤N, N is a natural number greater than or equal to 2.

[0079] 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;

[0080] Each of the lamps is connected in parallel between the positive connecting line and the negative connecting line.

[0081] In one embodiment, the controller is a chopper controller.

[0082] The controller is connected to the constant current and constant voltage dual-controlled power supply P1 and the constant current and constant voltage dual-controlled power supply P2. The main responsibility of the controller is to send instructions to the constant current and constant voltage dual-controlled power supply. In this way, the controller can effectively control the constant voltage power supply or constant current power supply and adjust the output voltage or current to ensure that the power supply of the entire system is in the best state.

[0083] 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.

[0084] In one embodiment, the controller is of TGK model.

[0085] The present invention sets the traditional constant current or constant voltage control lighting system as a constant current and constant voltage dual control system, and can start constant current or constant voltage control according to different states of the lighting device. The combination of dual control can not only ensure that the lighting system plays a protective role when the number of lamps changes or even sudden failures, but also maintain the uninterrupted continuous lighting of the lamps, which is beneficial to the safety and stable operation of the circuit, and provides users with a safer and more reliable lighting environment.

[0086] 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.

[0087] A first end of the first resistor R11 is connected to a first output end of the control unit MCU, a second end of the first resistor R11 is connected to a control end of the first switch tube T1, a first end of the first switch tube T1 is connected to a first end of the second resistor R12, a second end of the second resistor R12 is connected to a working power supply VCC, a first end of the second resistor R12 is connected to a first end of a third resistor R13, a second end of the third resistor R13 is connected to a first end of a first capacitor C1, a second end of the first capacitor C1 is connected to a second end of the first switch tube T1 and is grounded GND.

[0088] In one embodiment, the first switch tube T1 includes a triode or a MOS field effect tube.

[0089] In an application scenario, the first switch tube is a triode, the control end of the first switch tube T1 is a base, the first end of the first switch tube T1 is a collector, and the second end of the first switch tube T1 is an emitter.

[0090] In an application scenario, the first switch tube T1 is a MOS field effect tube, the control end of the first switch tube T1 is a gate, the first end of the first switch tube T1 is a drain, and the second end of the first switch tube T1 is a source.

[0091] 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.

[0092] A first end of the fourth resistor R21 is connected to the second output end of the control unit, a second end of the fourth resistor R21 is connected to the control end of the second switch tube T2, a first end of the second switch tube T2 is connected to a first end of the fifth resistor R22, a second end of the fifth resistor R22 is connected to a first end of the second capacitor C2, and a second end of the second capacitor C2 is connected to a second end of the second switch tube T2 and is grounded.

[0093] In one embodiment, the second switch tube includes a triode or a MOS field effect tube.

[0094] In one application scenario, the second switch tube is a triode, the control end of the second switch tube is a base, the first end of the second switch tube is a collector, and the second end of the second switch tube is an emitter.

[0095] 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.

[0096] The following example illustrates the control method of constant voltage and constant current.

[0097] When starting the constant voltage control, the constant current control needs to be turned off at the same time. The controller sends a constant voltage control instruction, and the control unit is MCU that receives the constant voltage control signal through CAN. The constant voltage control circuit outputs a constant voltage signal according to the constant voltage control instruction, that is, the control unit outputs a PMW2 signal at the first end of R21. At the same time, the control unit outputs a PMW low-level signal at the first end of R11, so that T1 is cut off. At this time, the intersection of R12, R11 and the input end of T1 is recorded as A1, which is a high level, and the high level of the working power supply VCC is output, so that the constant current output part is turned off, and the power supply unit only outputs a constant voltage.

[0098] When starting the constant current control, the constant voltage control needs to be turned off at the same time. The controller sends a constant current control instruction, and the control unit is MCU that receives the constant current control signal through CAN. The constant current control circuit outputs a constant current signal according to the constant current control instruction, that is, the control unit outputs a PMW1 signal at the first end of R11. At the same time, the control unit outputs a PMW low-level signal at the first end of R21, so that T2 is in a high-impedance state and the voltage output is zero, so that the constant voltage output part is turned off, and the power supply unit only outputs a constant current.

[0099] In summary, the PWM pulse width controls the on or off state. When T1 is steadily off, it is constant voltage control, and when T2 is in a steady high impedance state, it is constant current control. When constant current control is performed, the control input end of the constant voltage control circuit is in a high impedance state, and when constant voltage control is performed, the control input end of the constant current control circuit is in a high level state.

[0100] In one embodiment, the lamp comprises an LED lamp.

[0101] In one embodiment, referring to Figure 2-Figure 3 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.

[0102] In one embodiment, the first lamp, the second lamp, and finally the nth lamp are the first LED lamp, the second LED lamp, and finally 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.

[0103] One end of the positive connection line 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.

[0104] One end of the negative connection line 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.

[0105] In one embodiment, the wiring method is further improved, referring to Figure 4 The positive connection line includes a first positive line X11 and a second positive line X12. One end of the first positive line X11 is respectively connected to the positive output end of the constant current control circuit and the constant voltage control circuit, that is, the positive output end of the power supply unit, the other end of the first positive line X11 is connected to the second positive line X12, and the second positive line X12 is connected to the first end (positive port) of each lamp (the first lamp, the second lamp to the nth lamp).

[0106] The negative electrode connection line includes a first negative electrode line X22 and a second negative electrode line X21.

[0107] The first negative line X22 is connected to the second end of each of the lamps (the first lamp, the second lamp, up to the nth lamp), one end of the second negative line X21 is respectively connected to the negative output ends of the constant current control circuit and the constant voltage control circuit, and the other end of the second negative line X21 is connected to the second end (negative port) of the nth lamp.

[0108] In this way, through Figure 4 The improved wiring method balances the voltage drop of the lighting device circuit to a certain extent. 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%.

[0109] With the increasing scale of buildings and the diversification of lighting needs, how to ensure that lamps in every corner can obtain a stable voltage supply to achieve uniform and comfortable lighting effects has become an urgent problem to be solved. Figure 4 The improved wiring method shown has largely alleviated the problem of uneven voltage distribution in the lighting device circuit. This method effectively reduces the voltage drop caused by resistance during long-distance power transmission by cleverly adjusting the layout and connection method of the circuit. In particular, for the lamps in the middle position, although their voltage will still be affected to a certain extent due to their distance from the power center, this effect has been significantly weakened compared to the traditional wiring method. According to the measured data, after adopting the improved wiring method, the voltage deviation of the middle lamp is generally controlled within -10%, which is a completely acceptable range for most lighting applications.

[0110] Whether in large commercial complexes, high-rise office buildings or public venues, this improvement method can significantly improve the voltage distribution of the lighting system, improve lighting quality and energy efficiency.

[0111] In one embodiment, referring to Figure 5 , further improving the wiring method. The positive connection line also includes a third positive line X13, wherein the third positive line X13 is connected to the first end of the first lamp to the i-th lamp respectively, 1≤i≤N; the second positive line X12 between the first lamp to the i-th lamp is connected in parallel with the third positive line X13.

[0112] The negative electrode connection line also includes a third negative electrode line X23, wherein the third negative electrode line X23 is respectively connected to the second end of the jth unit to the nth unit, 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.

[0113] 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.

[0114] 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.

[0115] For example, the lighting device has 10 lamps, n=10, i=j=5. The 10 lamps include the first lamp, the second lamp, the third lamp, the fourth lamp to the ninth lamp and the tenth lamp connected in parallel in order from near to far from the power supply unit. The third positive line X13 is respectively connected to the first end (positive port) of the first to fifth lamps. The third negative line X23 is respectively connected to the second end (negative port) of the sixth unit to the tenth unit.

[0116] The i lamps connected to the third positive line X13 include: a first lamp, a second lamp, a third lamp, to a fifth lamp.

[0117] The j lamps connected to the third negative line X23 include: the sixth lamp, the seventh lamp, the eighth lamp to the tenth lamp.

[0118] 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.

[0119] In an application scenario, n is 7, and the third positive line X13 is connected to the first ends (positive ports) of the first lamp, the second lamp, the third lamp, and the fourth lamp, respectively. The third negative line X23 is connected to the second ends (negative ports) of the fifth lamp, the sixth lamp, and the seventh lamp, respectively. The number of lamps in the front half of the distance from the power supply unit is one more than the number of lamps in the rear half of the distance from the power supply unit.

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

[0121] In an application scenario, n is 9, and the third positive line X13 is connected to the first end (positive port) of the first lamp, the second lamp, the third lamp, and finally the fourth lamp. The third negative line X23 is connected to the second end (negative port) of the fifth lamp, the sixth lamp, and finally the ninth lamp. The number of lamps in the front half of the distance from the power supply unit is one less than that in the rear half of the distance from the power supply unit.

[0122] When n is an odd number, although the front and rear lamps are not completely identical, the difference is only 1, so the i-th lamp and the j-th lamp can be approximately considered as intermediate lamps, especially in long-distance and long-line lighting situations such as tunnels and public lighting.

[0123] This embodiment optimizes the light source layout and effect, especially in long-distance and long-line lighting scenarios such as tunnels and public lighting. When n is an odd number, although the configuration of the lamps in the front and rear parts is not completely mirror-symmetrical, there is only a slight difference, and this difference is only one lamp. In practical applications, due to various restrictions (such as installation space, cost budget, etc.), it is difficult to achieve a completely symmetrical lamp layout. Therefore, "the i-th lamp and the j-th lamp can be used as the middle lamp" and the lighting line design and adjustment can be carried out accordingly.

[0124] 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 ends of the lamp, and significantly improving the uniformity of the overall lamp.

[0125] The present invention can shunt the current at both ends of the LED lamp connected in parallel through the third positive line X13 and the third negative line X23. Under the condition of constant current of the LED lamp, the voltage at both ends of multiple LED lamps tends to be balanced, reducing the voltage drop problem of the middle LED lamp when multiple LED lamps are connected in parallel, thereby meeting the constant current and voltage equalization requirements of the LED lamp.

[0126] The lighting device of the present invention realizes the constant current and voltage equalization effect of the LED lamp group in parallel connection through ingenious design, which greatly improves the stability and efficiency of the lighting system. The core lies in the introduction of the third positive line X13 and the third negative line X23. These two special connecting lines play a vital role in the LED lamp group.

[0127] In a traditional parallel LED lamp group, due to the slight differences between the LED lamps (such as different internal resistance), when current passes through, the LED lamp in the middle position often suffers a large voltage drop, thereby affecting its luminous efficiency and life. The present invention realizes effective current shunting at both ends of the parallel LED lamps by adding X13 and X23 connecting wires.

[0128] Specifically, the X13 and X23 cables serve as current shunt channels to ensure that the voltages at both ends of each LED lamp are consistent. This design not only reduces the voltage drop problem of the middle LED lamp, but also ensures that each LED lamp in the entire lamp group can obtain a stable and uniform current supply.

[0129] In addition, the present invention also demonstrates wide adaptability and flexibility in practical applications. Whether it is indoor lighting, outdoor landscape lighting or automotive lighting, the constant current and voltage equalization effect of LED lamps can be achieved by properly configuring the X13 and X23 connecting wires.

[0130] In one embodiment, there are multiple power supply units, and the power supply units are connected in parallel. Figure 2 , 4 -5, two power supply units P1 and P2 are connected in parallel.

[0131] The lighting system of the present invention adopts a DC centralized drive mode, and a constant voltage or constant current power supply. When lighting starts, the power supply unit is controlled to perform constant voltage control to ensure the stability of the circuit. When it is detected that the current of the lighting device in the system is too high, the controller switches the constant voltage control to constant current control to optimize the performance of the power supply. The advantage of this method is that when a short circuit occurs in the circuit, the maximum value of the short-circuit current will be limited to the constant current value range output by the power supply unit.

[0132] The present invention also provides a method for lighting control using the above lighting system, referring to Figure 6 ,include:

[0133] S1, a constant current control circuit of a power supply unit is controlled by a controller to output a constant current;

[0134] S2, the lighting device receives the constant current;

[0135] S3, obtaining an output voltage value corresponding to the constant current control circuit when outputting the constant current;

[0136] S4, taking the obtained voltage value as a preset rated voltage value, and controlling the constant voltage control circuit of the power supply unit to output a constant voltage through a controller based on the preset rated voltage value;

[0137] S5, the lighting device receives the constant voltage and illuminates.

[0138] 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:

[0139] S11, obtaining the number n of lamps of the lighting device;

[0140] S12, obtaining the rated power and rated voltage of the lamp;

[0141] S13, obtaining a rated current of the lighting device based on the number n, the rated power and the rated voltage;

[0142] S14, controlling the constant current control circuit to output a constant current through a controller according to the rated current.

[0143] With this constant current, the output voltage value corresponding to the constant current control circuit when outputting the constant current can be obtained through measurement and collection.

[0144] In an application scenario, the lamp is an LED lamp, and the number of the 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. By calculation, the rated current of a single LED lamp is 1A.

[0145] The total current of 10 LED lights is 10A.

[0146] The controller controls the constant current control circuit to output a constant current of 10A, and collects the output voltage value of the constant current control circuit under the output current of 10A, which is measured to be 230V. 230V is generated with 10A, and is often measured and collected. 230V is the voltage with actual line loss voltage drop. This voltage is used as the reference for constant voltage control, 230V is stored, and this voltage value is used as the control value of 100% of the rated constant voltage output of the power supply unit.

[0147] In one embodiment, the method further comprises:

[0148] 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;

[0149] S7, the constant voltage control circuit outputs a constant voltage according to the instruction.

[0150] In an application scenario, the lamp is an LED lamp, and the number of LED lamps is 10. The rated current of a single LED lamp is calculated to be 1A. After measurement, when all 10 lamps are normally illuminated at the rated state, the actual line loss voltage drop is 230V. 230V is generated by 10A.

[0151] After turning off the two lamps, in order to stabilize the brightness of the lamps and avoid overload, the controller controls the constant voltage control circuit of the power supply unit to output a constant voltage downward, taking 230V as the actual 100% rated voltage reference, and the adjusted output constant voltage adjustment value is 229V.

[0152] After turning off the five lamps, the controller controls the constant voltage control circuit of the power supply unit to adjust the output constant voltage downward, and the output constant voltage adjustment value is 228V after adjustment.

[0153] The above voltage adjustment value can be obtained by using a pre-established line current-voltage mapping relationship.

[0154] 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 and stores the voltage and line loss voltage drop of the lighting device, 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.

[0155] When dimming control is performed, the controller sends the rated constant voltage output and the following control value command to the constant current and constant voltage dual-controlled power supply of the power supply unit. When the output voltage is reduced, the corresponding lighting unit current is also automatically reduced, and the brightness of the lamp is also automatically reduced to achieve the purpose of dimming and energy saving.

[0156] In one embodiment, the method further comprises:

[0157] 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.

[0158] In the previous application scenario, S13, it is calculated that the rated current of the lighting device is 10A, and this value is used as the upper limit of the current.

[0159] 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.

[0160] During the constant voltage control process of the lighting system, when the current of the lighting device is detected to rise to the critical point of 10A, it will immediately switch to the constant current power supply mode to ensure that the system will not be overloaded. In this way, the system can intervene immediately when the current shows a slight upward trend, effectively avoiding the occurrence of overload and building a solid protective wall for the lighting device.

[0161] When the current in the lighting circuit where the lamp is located begins to show signs of overload, the present invention immediately triggers the switching of the constant current power supply mode. In the constant current power supply mode, the system can ensure that the lamp continues to illuminate and emit light, while strictly limiting the current within a preset safety range, which not only ensures the continuity and stability of the lighting, but also avoids irreversible damage to the lamp caused by excessive current.

[0162] Therefore, the constant current power supply switching mechanism in the constant voltage control of the lighting system of the present invention is undoubtedly a technical innovation of great significance. It not only improves the safety and stability of the lighting system, but also significantly prolongs the service life of the lamp and reduces the maintenance cost.

[0163] In one embodiment, in S8, the power supply unit switches to constant current control and stops constant voltage control at the same time, including:

[0164] 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.

[0165] Specific description: In the previous application scenario, S13, it is calculated that the rated current of the lighting device is 10A, and this value is used as the upper limit of the current.

[0166] The controller sends a command to output a constant current of 10A to the control unit of the power supply unit through the 485 serial port or CAN bus. After receiving the command, the control unit controls the constant current control circuit to output 10A and controls the constant voltage control circuit to be cut off. For example, refer to Figure 3 A PWM2 low-level signal is output to the constant voltage control circuit to put the constant voltage control circuit in a high-impedance state and cut off.

[0167] The core of the present invention is to implement precise constant voltage and constant current control strategies for the lighting system. Specifically, when the system starts formal lighting, the constant voltage control part in the power supply unit enters the working state, outputs a stable and constant voltage, and provides a solid power foundation for the entire lighting system. At this stage, the constant current power supply remains silent and does not participate in the distribution and conversion of electrical energy.

[0168] In constant pressure control mode, for example Figure 5 With the wiring method, the lamps in the lighting device, whether LED lamp beads or other types of light sources, can emit bright and uniform light under the drive of constant voltage. It is worth noting that even if the number of lamps in the lighting device is reduced for some reason (such as manually turning off the lamps, some lamp beads are damaged or failed, etc.), since the voltage at both ends of each lamp remains consistent, the lighting effect of the entire lighting system will not be significantly affected. The cleverness of this design is that it ensures the stability and reliability of the lighting system in the face of emergencies.

[0169] However, the stable operation of the lighting system is not a one-time thing. In practical applications, as the load increases or the circuit ages, the current of the lighting device may gradually increase, or even exceed the preset safety threshold. At this time, the system is facing the risk of overload. To this end, the present invention introduces an intelligent monitoring and switching mechanism. When it is detected that the current of the lighting device exceeds a certain limit, this mechanism will respond quickly and automatically switch the power supply unit from the constant voltage control mode to the constant current control mode. In this mode, the originally silent constant current control part starts to work, and it outputs a constant and controlled constant current to ensure that the lighting system can still maintain a stable lighting effect when the load changes. At the same time, the constant voltage control part exits the working state to avoid unnecessary energy loss and safety hazards.

[0170] The present invention uses precise constant voltage and constant current control strategies to ensure the stable operation of the entire lighting system regardless of how the number of lamps in the lighting device changes. The lamps will not go out and the lighting can be maintained continuously. This stability not only improves the user experience, but also greatly reduces the safety hazards caused by system failures.

[0171] The introduction of intelligent monitoring and switching mechanism makes the present invention highly automated and intelligent, and can automatically adjust the working state to adapt to different load conditions without relying on human intervention, thereby reducing operation and maintenance costs and improving the maintainability of the system.

[0172] In one embodiment, there are multiple power supply units.

[0173] When there are multiple power supply units, they can be used simultaneously or some can be used selectively and the rest can be kept as standby.

[0174] In one embodiment, the multiple power supply units include a main power supply and a backup power supply. There can be one or more main power supplies, and the backup power supply is also connected to the system. In modern power systems, the stability and reliability of power supply units are crucial, especially in those occasions with high requirements for continuous power supply, such as tunnel lighting. In this embodiment, a combination of a main power supply and a backup power supply is used. How does this configuration ensure that the system can achieve uninterrupted lighting?

[0175] In an application scenario, there are three power supply units P1, P2 and P3 connected in parallel, P3 is a backup, and the other two (P1 and P2) are in use. Each power supply has an output power of 1 kW, and the total output power is 2 kW. There are 10 lamps in the lighting device. When one of P1 or P2 is damaged and the other can work normally, the total output power is 1 kW, so the brightness of the lighting device is reduced by half. Although the brightness is reduced, the lighting can still be maintained. After the backup power supply P3 is put into use, the lighting effect is still 2 kW output power, ensuring the lighting effect.

[0176] In one embodiment, when the multiple power supply units are used simultaneously,

[0177] Collect the current value output by each power supply unit;

[0178] Obtaining a current output mean value according to the current value;

[0179] Based on the current output mean value, the voltage value output by each power supply unit is adjusted by the controller.

[0180] 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 unit.

[0181] Reference Figure 5 , two constant current and constant voltage dual-controlled power supply units are used, and the two units are connected in parallel to achieve output. Each power supply unit includes an independent control unit, namely a single-chip microcomputer, which is used to monitor and sample current values ​​in real time. When there is a difference between these sampled current values, the system uses the average value of all sampled currents as the control target. Through the precise adjustment of the controller, the output voltage of each power supply unit will be adjusted accordingly. Specifically, if the current value of a power supply unit is higher than the average value, that is, a positive deviation occurs, the controller will instruct the power supply unit to lower its output voltage; on the contrary, if the current value of a power supply unit is lower than the average value, that is, a negative deviation occurs, the controller will instruct the unit to increase its output voltage.

[0182] The advantage of this design method is that it can effectively achieve voltage balancing control without relying on complex voltage balancing line circuits. Traditional voltage balancing line circuits not only increase the complexity and cost of the power supply system, but may also cause crosstalk and oscillation failures between individual power supply units. Through this method based on current sampling and voltage regulation, the overall cost of the power supply system can be significantly reduced, and the stability and reliability of the system can be improved. In addition, this intelligent control strategy can also dynamically adapt to load changes, ensuring the stability and consistency of power supply output, thereby providing more reliable and efficient power support for various applications.

[0183] The innovation of power control technology is crucial to improving equipment efficiency and ensuring circuit safety. The unique control strategy adopted by the present invention is an important breakthrough in this field. The present invention performs constant voltage control on the lighting system to ensure that the voltage across the lighting fixture remains constant within a preset range. Voltage stability is of great significance for lighting systems with multiple lamps in parallel, as it is directly related to the luminous efficiency and uniformity of the lamps.

[0184] On the basis of constant voltage control, a constant current control strategy is also cleverly incorporated to effectively resist the potential threats brought by external shocks and internal faults. When a short circuit occurs in the circuit, the short-circuit current may instantly soar to dozens of times the rated current or even higher, causing a devastating blow to the circuit system. The constant current control strategy of the present invention can respond quickly and limit the short-circuit current to a preset constant current value range, thereby effectively avoiding the damage caused by high current shocks to the circuit system.

[0185] This combination of dual control can not only ensure that the lighting system plays a protective role when the number of lamps changes or even sudden failures occur, but also maintain the uninterrupted lighting of the lamps, which is conducive to the safety and stable operation of the circuit, and provides users with a safer and more reliable lighting environment. Whether in the field of home lighting, commercial lighting or industrial lighting, the present invention can play a huge role. It can not only improve the overall efficiency and stability of the lighting system, but also reduce maintenance costs and safety risks, bringing users a more convenient, efficient and safe lighting experience.

[0186] 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.

[0187] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A lighting system, characterized in that: include: A power supply unit, a 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 comprises a first input terminal, a second input terminal, a first output terminal and a second output terminal, the first input terminal is used to receive electric energy, the second input terminal is connected to the controller, the first output terminal is connected to the constant current control circuit, and the second output terminal is connected to the constant voltage control circuit; The lighting device comprises 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, characterized in that The constant current control circuit comprises: a first resistor, a second resistor, a third resistor, a first switch tube and a first capacitor; Among them, the first end of the first resistor is connected to the first output end of the control unit, the second end of the first resistor is connected to the control end of the first switch tube, the first end of the first switch tube is connected to the first end of the second resistor, the second end of the second resistor is connected to a working power supply, the first end of the second resistor is connected to the first end of the third resistor, the second end of the third resistor is connected to the first end of the first capacitor, and the second end of the first capacitor is connected to the second end of the first switch tube and grounded.

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 a base, the first end of the first switch tube is a collector, and the second end of the first switch tube is an emitter.

5. The system according to claim 2, characterized in that 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 switch tube and a second capacitor; wherein, the first end of the fourth resistor is connected to the second output end of the control unit, the second end of the fourth resistor is connected to the control end of the second switch tube, the first end of the second switch tube is connected to the first end of the fifth resistor, the second end of the fifth resistor is connected to the first end of the second capacitor, and the second end of the second capacitor is connected to the second end of the second switch tube and grounded.

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 a base, the first end of the second switch tube is a collector, and the second end of the second switch tube is an emitter.

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

11. The system according to claim 10, characterized in that 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 end 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; Among them, the first negative line is connected to the second end of each of the lamps, 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, characterized in that The positive connection line also includes a third positive line, wherein the third positive line is connected to the first end of the first lamp to the i-th lamp respectively, 1≤i≤N; the second positive line between the first lamp to the i-th lamp is connected in parallel with the third positive line; The negative electrode connection line also includes a third negative electrode line, wherein the third negative electrode line is connected to the second ends of the jth lamp to the nth lamp respectively, 1≤j≤N; the first negative electrode line between the jth lamp to the nth lamp is connected in parallel with the third negative electrode line.

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

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

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

16. The system according to claim 1, characterized in that The lamp comprises an LED lamp.

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

18. A method for lighting control using the lighting system according to any one of claims 1 to 17, characterized in that: include: The controller controls the constant current control circuit of the power supply unit to output a constant current; The lighting device receives the constant current; Obtaining an output voltage value corresponding to the constant current control circuit when outputting the constant current; 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; The lighting device receives the constant voltage and illuminates.

19. The method according to claim 18, characterized in that The controller controls the constant current control circuit of the power supply unit to output a constant current, comprising: Obtain the number n of lamps of the lighting device; Obtaining the rated power and rated voltage of the lamp; Based on the number n, the rated power and the rated voltage, a rated current of the lighting device is obtained; According to the rated current, the constant current control circuit is controlled by the controller to output a constant current.

20. The method according to claim 18, characterized in that The method further comprises: 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; The constant voltage control circuit outputs a constant voltage according to the instruction.

21. The method according to claim 18, characterized in that The method further comprises: 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.

22. The method according to claim 21, characterized in that The power supply unit switches to constant current control and stops constant voltage control at the same time, comprising: 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.

23. The method according to claim 19, characterized in that The number of the power supply units is multiple.

24. The method according to claim 23, characterized in that The plurality of power supply units include a main power supply and a backup power supply.

25. The method according to claim 23, characterized in that When the plurality of power supply units are used simultaneously, Collect the current value output by each power supply unit; Obtaining a current output mean value according to the current value; Based on the current output mean value, the voltage value output by each power supply unit is adjusted by the controller.

Images