Multi-stage low-voltage lamp strip lighting system

Abstract

The utility model discloses a multi-stage low-voltage lamp strip lighting system, and relates to the field of low-voltage lighting equipment. The system comprises a voltage transformation module and a multi-stage lamp strip assembly, the voltage transformation module adopts a multi-frequency voltage transformation adjusting unit, a three-stage power supply wiring terminal group is configured outside the voltage transformation module, and an intelligent voltage transformation coordination unit is integrated inside the voltage transformation module; the multi-stage lamp strip assembly comprises a first-stage lamp strip, a second-stage lamp strip and a third-stage lamp strip which are respectively provided with a one-way electric loop, a two-way electric loop and a three-phase electric loop, and a two-way power supply connector is arranged in front of an initial terminal and a tail terminal of each stage of lamp strip. According to the system, the use requirements of the multi-stage lamp strip assembly under different voltage conditions are met through the voltage transformation module structure; the branch power supply cable is added to adapt to long-distance illumination, the installation difficulty is reduced, the safety performance is improved, the problems that the length of a single low-voltage lamp strip is limited, light decay occurs, installation is complex and the like are solved, the service life is prolonged, and the circuit stability is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage lighting equipment, and in particular to a multi-level low-voltage light strip lighting system. Background Technology

[0002] In the field of lighting technology, LED strips, as a commonly used lighting device, have been widely applied in home decoration, commercial displays, and landscape lighting. Currently, the mainstream types of LED strips on the market are low-voltage LED strips and high-voltage LED strips.

[0003] High-voltage LED strips can typically be directly connected to 110V or 220V AC mains voltage without the need for an additional transformer module, making initial installation relatively convenient. However, due to their high operating voltage, electronic components are prone to frequent failures under prolonged use due to the significant electrical stress, resulting in poor durability. From a safety perspective, if the wiring of a high-voltage LED strip is damaged, the high voltage can easily cause electric shock accidents, posing a significant safety hazard. Furthermore, a single strip can be up to 100 meters long, and it is commonly cut at 1-meter intervals (some are cut at 0.5-meter intervals). Cutting it at any of these intervals renders the entire strip unusable, limiting its application flexibility.

[0004] Low-voltage LED strip lights typically operate at 12V, 24V, or 36V, which is within the safe range for human use. Using low-voltage LED strip lights significantly reduces the risk of electric shock, and the low voltage operation enhances circuit stability, reduces component wear, and extends the lifespan of the strip lights. However, the standard length of low-voltage LED strip lights is generally 5 meters or 10 meters. When using single-ended power supply, exceeding this length can cause a significant voltage drop due to line resistance, leading to light decay and severely affecting the uniformity and effectiveness of lighting. Furthermore, the installation of low-voltage LED strip lights requires professional personnel to ensure correct wiring, and has stringent requirements regarding the installation environment and wiring methods. This increases installation difficulty and cost, and limits their widespread application in many scenarios.

[0005] Existing patent CN222992827U discloses a wide-voltage LED light strip compatible with both 24V and 36V, comprising a flexible circuit board. The flexible circuit board includes an LED bead group and a control element group, which are connected in series. The LED bead group includes several LED beads connected in parallel, and the control element group includes several constant current ICs and several resistors connected in parallel. This invention has a simple structure, low production cost, stable control, wide input voltage range, low light attenuation over long distances, and good lighting effect. However, this light strip only solves the problem of light attenuation over long distances for some low-voltage light strips; it does not address the power supply adaptation problem of low-voltage light strips, nor does it consider the installation difficulty in actual use.

[0006] Existing document CN120101099A discloses an easy-to-install and use LED light strip, comprising several light strip units connected in parallel. Each light strip unit has a positive conductive wire and a negative conductive wire at its bottom. The positive conductive wire is connected to the positive conductive copper foil of the light strip unit via several positive connecting wires, and the negative conductive wire is connected to the negative conductive copper foil of the light strip unit via several negative connecting wires. This structure is simple and stable, with low light decay over long distances, stable illumination, and the ability to form a multi-source power supply. However, this structure does not address the power supply adaptation problem when multiple light strips work together, nor can it solve the power supply adaptation problem of multi-level low-voltage light strips. Utility Model Content

[0007] The purpose of this utility model is to overcome the technical problems of limited single-strip length, significant light decay, complex installation, inability of traditional transformers to adapt to multi-level light strips, and insufficient circuit stability and safety performance in the existing technology, and to provide a multi-level low-voltage light strip lighting system.

[0008] In a first aspect, the present invention provides a multi-stage low-voltage LED strip lighting system, the system comprising:

[0009] A transformer module and a multi-stage LED strip assembly, wherein the transformer module supplies power to the multi-stage LED strip assembly;

[0010] The aforementioned multi-level LED strip assembly includes a primary LED strip, a secondary LED strip, a tertiary LED strip, and a bidirectional power supply connector; each LED strip has a starting terminal and an ending terminal.

[0011] The aforementioned primary, secondary, and tertiary LED strips are connected in series. The starting terminal of the primary LED strip is electrically connected to the positive and negative terminals of the primary power supply terminal of the transformer module, and the ending terminal of the primary LED strip is electrically connected to the starting terminal of the secondary LED strip. The starting terminal of the secondary LED strip is also electrically connected to the positive and negative terminals of the secondary power supply terminal of the transformer module, and the ending terminal of the secondary LED strip is electrically connected to the starting terminal of the tertiary LED strip. The starting terminal of the tertiary LED strip is also electrically connected to the positive and negative terminals of the tertiary power supply terminal of the transformer module. The bidirectional power supply connector is located before the starting and ending terminals of each LED strip.

[0012] The power supply circuit for the first-level light strip is a unidirectional power supply circuit, the power supply circuit for the second-level light strip is a bidirectional power supply circuit, and the power supply circuit for the third-level light strip is a three-phase power supply circuit.

[0013] Preferably, the above-mentioned transformer module adopts a multi-frequency transformer regulation unit, is externally configured with a three-level power supply terminal block, and internally integrates an intelligent transformer coordination unit.

[0014] Preferably, the aforementioned intelligent transformer coordination unit can adjust the system's output voltage in real time according to the external lighting load power (e.g., "when the load power exceeds 80% of the rated value, the voltage is adjusted to 24V; when it is below 30%, it is adjusted to 12V"), ​​ensuring that the power supply matches the current lighting requirements. The aforementioned transformer module can be the Tridonic series DALI-2 intelligent dimming power supply module, which has a built-in multi-frequency transformer regulation unit and meets the structural requirements of this utility model.

[0015] Preferably, in the above-mentioned multi-level light strip assembly, the first-level light strip, the second-level light strip, and the third-level light strip have the same or different lengths.

[0016] Preferably, the multi-level light strip assembly further includes an insulating shell, which is wrapped around the first-level light strip, the second-level light strip, the third-level light strip and the bidirectional power supply connector.

[0017] Preferably, in the above-mentioned multi-level light strip assembly, multiple light-emitting diodes are provided on the first-level light strip, the second-level light strip, and the third-level light strip, and the light-emitting diodes are surface-mount LEDs.

[0018] Preferably, the bidirectional power supply connector is composed of a unidirectional conductive semiconductor device, used to realize the bidirectional power supply function of the secondary light strip and the three-phase power supply function of the tertiary light strip.

[0019] Preferably, the unidirectional conductive semiconductor device is a unidirectional crystal diode or a thyristor.

[0020] Beneficial effects:

[0021] By adopting a transformer module design, and using unidirectional conductive semiconductor devices at the circuits and interfaces of the multi-level light strip components, the technical problems of traditional transformer structures being unable to adapt to multi-level light strips, long-distance lighting being limited to a single power supply mode, and complex installation and insufficient safety are overcome. Through the three-level terminal and multi-circuit design of the transformer module, the power supply of multi-level light strips is adapted. The unidirectional conductive semiconductor devices are used to control the power supply direction to avoid current conflicts when powering through multiple paths. Attached Figure Description

[0022] Figure 1 This is a diagram of a multi-level LED strip assembly.

[0023] Figure 2 This is a diagram of a transformer module.

[0024] Figure Labels

[0025] 1. Three-level LED strip; 2. Two-level LED strip; 3. One-level LED strip; 4. LED beads; 5. Two-way power supply connector;

[0026] 61. Positive terminal of the primary power supply connector for the transformer module; 62. Negative terminal of the primary power supply connector for the transformer module;

[0027] 71. Positive terminal of the secondary power supply connector for the transformer module; 72. Negative terminal of the secondary power supply connector for the transformer module;

[0028] 81. Positive terminal of the three-stage power supply wiring for the transformer module; 82. Negative terminal of the three-stage power supply wiring for the transformer module. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. All technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0030] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer" used in the description of specific embodiments of this utility model to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0031] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0032] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0033] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0034] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0035] Example 1

[0036] The transformer module has the following structure: Figure 2 As shown:

[0037] A multi-frequency transformer regulating unit with a rated power of 500W is selected. It is externally configured with a three-stage power supply terminal block (including transformer module primary power supply terminal positive 61, transformer module primary power supply terminal negative 62, transformer module secondary power supply terminal positive 71, transformer module secondary power supply terminal negative 72, transformer module tertiary power supply terminal positive 81, and transformer module tertiary power supply terminal negative 82), corresponding to the power supply of primary LED strip 3, secondary LED strip 2, and tertiary LED strip 1, respectively. An internal intelligent transformer coordination unit is integrated, which can monitor the external lighting load power in real time.

[0038] The N terminal is the neutral wire terminal.

[0039] Multi-level LED strip assembly, with LED beads 4 evenly distributed on the LED strip, its structure is as follows: Figure 1 As shown:

[0040] Level 3 LED strip: 10m in length, configured with a unidirectional power circuit. Waterproof power supply interfaces are located on both sides of the strip. The positive and negative terminals of the strip's starting connection are connected via these interfaces to the positive terminal 61 and the negative terminal 62 of the transformer module's primary power supply terminal, forming a single-ended power input link. This level of LED strip serves as the system's basic unit, supporting only unidirectional power intake from the transformer module's primary power supply terminal to provide basic ambient light for the illuminated area. It is the initial power input link for the system and does not have reverse power supply capability.

[0041] Secondary LED strip 2: 15m in length, equipped with a bidirectional power circuit, and reverse connection protection interfaces at both ends, with the internal main power supply line passing through the interface. The starting terminal of the secondary LED strip 2 is electrically connected to the ending terminal of the primary LED strip 3. A bidirectional power supply connector 5 is installed at the interface where it connects to the primary LED strip 3 (i.e., the reverse connection protection interface of the secondary LED strip 2 near the primary LED strip 3). This bidirectional power supply connector 5 is a parallel array of 1N5408 Schottky diodes. The 1N5408 Schottky diodes have low forward voltage drop and high switching speed characteristics, suitable for low-voltage, high-current scenarios. The positive and negative terminals of the starting terminal of the secondary LED strip 2 are connected to the positive terminal 71 and the negative terminal 72 of the secondary power supply terminal of the transformer module through its own reverse connection protection interface, allowing it to directly obtain power from the transformer module. With the help of the parallel diode array, power can flow from the power supply circuit of the primary LED strip 3 into the reverse connection protection interface of the secondary LED strip 2, forming a cross-level emergency power supply path. This design enables the secondary light strip 2 to have bidirectional power supply redundancy, making it suitable for decorative lighting scenarios such as atriums that require dynamic lighting effects.

[0042] The third-level light strip 1 is 20m long and has three power circuits. The starting terminal of the third-level light strip 1 connects to the positive terminal 81 and negative terminal 82 of the transformer module's third-level power supply terminals via its own high-voltage insulated power supply interface. Simultaneously, a bidirectional power supply connector 5 is installed at the high-voltage insulated power supply interface connecting the third-level light strip 1 to the first-level light strip 3 and the second-level light strip 2. This bidirectional power supply connector 5 consists of a BTA16 thyristor connected in series in each branch line (the thyristor's control electrode is connected to the intelligent control module), forming an intelligent power distribution node. This design allows the third-level light strip 1 to: ① draw power from the main circuit via the positive terminal 81 and negative terminal 82 of the transformer module's third-level power supply terminals; ② draw power from the waterproof power supply interface of the first-level light strip 3 (via the transformer module's first-level power supply terminals) and the reverse connection protection interface of the second-level light strip 2 (via the transformer module's second-level power supply terminals) via the branch lines connected in series with the thyristors. During operation, the system dynamically adjusts the current ratio of each path through thyristors to form a multi-source collaborative power supply architecture, which significantly improves power supply reliability and meets the power and stability requirements of key lighting areas.

[0043] Installation method:

[0044] Transformer module installation: The transformer module can be installed in a dedicated distribution box within the electrical equipment room, secured by the distribution box's mounting rails to ensure a stable installation. Connect the input side of the transformer module to the mall's main power supply line using compliant wires, employing crimping of the power supply terminals to ensure a secure connection and good insulation. Sufficient wire length should be provided for the primary, secondary, and tertiary power supply terminal blocks on the output side for connection to various levels of LED strips.

[0045] Installation of Primary Light Strip 3: Based on the basic lighting design of the central circular area, secure the Primary Light Strip 3 every 50 cm along the ceiling edge or decorative lines using dedicated light strip clips. Connect the power supply terminal of the Primary Light Strip 3 to the wire leading from the primary power supply terminal of the transformer module using a quick-connect connector, ensuring a tight connection to prevent loosening.

[0046] Secondary LED Strip 2 Installation: For areas requiring enhanced decorative effects, secure the secondary LED strip 2 to the designated positions using industrial-grade double-sided adhesive or clips, following the design pattern or outline. During connection, first solder the unidirectional conductive semiconductor device (1N5408 unidirectional crystal diode) to the interface circuit of the secondary LED strip 2 with the correct polarity. Then, use a waterproof connector to connect the secondary LED strip 2 to the wires leading from the secondary power supply terminal of the transformer module, ensuring proper waterproofing and insulation.

[0047] Installation of Level 3 LED Strip 1: For key lighting display areas, determine the installation location of Level 3 LED Strip 1 according to actual needs. It can be installed using recessed mounting or surface adhesive mounting. After soldering the BTA16 thyristor to the interface, use a dedicated waterproof junction box to connect the Level 3 LED Strip 1 to the wires leading from the power supply terminals of the transformer module. Ensure the power supply connection is correct and secure, and seal the junction box to prevent dust and moisture from entering.

[0048] Use an insulating shell to wrap around each level of the light strip, and ensure that the shell is undamaged during installation.

[0049] Example 2

[0050] Transformer module:

[0051] It adopts a multi-frequency transformer regulation unit with a rated power of 400W, equipped with a three-level power supply terminal block (including transformer module primary power supply terminal positive 61, transformer module primary power supply terminal negative 62, transformer module secondary power supply terminal positive 71, transformer module secondary power supply terminal negative 72, transformer module tertiary power supply terminal positive 81, and transformer module tertiary power supply terminal negative 82), and integrates an intelligent transformer coordination unit, which can communicate with other intelligent control systems.

[0052] Multi-level LED strip assembly:

[0053] Level 3 LED strip: 20m in length, configured with a unidirectional power circuit. Waterproof power supply interfaces are located on both sides of the strip. The positive and negative terminals of the strip's starting connection are connected via these interfaces to the positive terminal 61 and the negative terminal 62 of the transformer module's primary power supply terminal, forming a single-ended power input link. This level of LED strip serves as the system's basic unit, supporting only unidirectional power intake from the transformer module via the primary power supply terminal, providing basic ambient light for the illuminated area.

[0054] Secondary LED strip 2: 25m in length, equipped with a bidirectional power circuit, and reverse connection protection interfaces at both ends. The starting terminal of secondary LED strip 2 is electrically connected to the ending terminal of primary LED strip 3. A bidirectional power supply connector 5 is installed at the interface where it connects to primary LED strip 3 (i.e., the reverse connection protection interface of secondary LED strip 2 near primary LED strip 3). This bidirectional power supply connector 5 consists of a parallel array of FR207 fast recovery diodes. The positive and negative terminals of the starting terminal of secondary LED strip 2 are connected to the positive terminal 71 and the negative terminal 72 of the secondary power supply terminal of the transformer module through its own reverse connection protection interface, allowing it to directly obtain power from the transformer module. With the help of the parallel FR207 diode array (forward voltage drop approximately 0.6V, reverse recovery time ≤500ns), power can flow from the power supply circuit of primary LED strip 3 into the reverse connection protection interface of secondary LED strip 2, forming a cross-level emergency power supply path. This design enables the secondary light strip 2 to have bidirectional power supply redundancy, making it suitable for decorative lighting scenarios such as atriums that require dynamic lighting effects.

[0055] Level 3 LED strip 1: 30m in length, configured with three power circuits. The starting terminal of Level 3 LED strip 1 connects to the positive terminal 81 and the negative terminal 82 of the transformer module's level 3 power supply terminal via its own high-voltage insulated power supply interface. Simultaneously, a bidirectional power supply connector 5 is installed at the high-voltage insulated power supply interface where Level 3 LED strip 1 connects to Level 1 LED strip 3 and Level 2 LED strip 2. This bidirectional power supply connector 5 consists of a TLC336 thyristor (rated current 6A, withstand voltage 400V, control electrode trigger current ≤50mA, thyristor control electrode connected to the intelligent control module) connected in series in each branch line, forming an intelligent power distribution node. This design allows the three-stage LED strip 1 to: ① draw power from the main circuit via the positive terminal 81 and negative terminal 82 of the transformer module's three-stage power supply terminals; ② draw power from the waterproof power supply interface of the first-stage LED strip 3 (via the transformer module's first-stage power supply terminals) and the reverse connection protection interface of the second-stage LED strip 2 (via the transformer module's second-stage power supply terminals) via a branch line connected in series with a TLC336 thyristor. During operation, the system dynamically adjusts the current ratio of each path through the thyristor, forming a multi-source collaborative power supply architecture, significantly improving power supply reliability and meeting the power and stability requirements of key lighting areas.

[0056] Installation method:

[0057] Transformer module installation: Install the transformer module in a dedicated electrical control box and secure it using the mounting brackets inside the control box. Connect the input side of the transformer module to the hotel's main power supply line using flame-retardant wires, employing cold-pressed terminals and ensuring proper insulation. Lead out wires from the three-stage power supply terminal blocks on the output side, clearly marking the wiring for future connection to the LED strips.

[0058] Installation of Primary Light Strip 3: According to the basic lighting layout, fix the Primary Light Strip 3 along the edge of the ceiling or the decorative lines of the wall using light strip clips with a spacing of 40 cm. Connect the power supply terminal of the Primary Light Strip 3 to the corresponding power supply terminal of the transformer module using a solderless quick-connect clamp to ensure a reliable connection, and wrap the connection with insulating tape.

[0059] Secondary LED Strip 2 Installation: For areas requiring localized lighting, attach the secondary LED strip 2 to the ceiling or wall using flexible LED strip adhesive according to the design. First, solder the FR207 fast recovery diode to the interface circuit of the secondary LED strip 2. Then, use a waterproof connector to connect the secondary LED strip 2 to the wires leading from the corresponding power supply terminals of the transformer module. Seal and insulate the connectors with heat shrink tubing.

[0060] Installation of Level 3 LED Strip 1: In areas requiring focused lighting, the Level 3 LED Strip 1 should be embedded in the edge of the site or within the background structure, depending on the shape of the site and lighting needs. First, correctly install the TLC336 thyristor at the interface. Then, use a power supply terminal block to connect the wires leading from the corresponding power supply terminals of the transformer module to the Level 3 LED Strip 1. After connection, protect the entire wiring area to prevent collisions and damage during use.

[0061] Use an insulating shell to wrap around each level of the light strip, and ensure that the shell is undamaged during installation.

[0062] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-stage low-voltage LED strip lighting system, characterized in that, include: A transformer module and a multi-stage LED strip assembly, wherein the transformer module supplies power to the multi-stage LED strip assembly; The multi-level LED strip assembly includes a primary LED strip, a secondary LED strip, a tertiary LED strip, and a bidirectional power supply connector; each LED strip has a starting terminal and an ending terminal. The primary, secondary, and tertiary LED strips are connected in series. The starting terminal of the primary LED strip is electrically connected to the positive and negative terminals of the primary power supply of the transformer module, and the ending terminal of the primary LED strip is electrically connected to the starting terminal of the secondary LED strip. The starting terminal of the secondary LED strip is also electrically connected to the positive and negative terminals of the secondary power supply of the transformer module, and the ending terminal of the secondary LED strip is electrically connected to the starting terminal of the tertiary LED strip. The starting terminal of the tertiary LED strip is also electrically connected to the positive and negative terminals of the tertiary power supply of the transformer module. The bidirectional power connector is located before the starting and ending terminals of each LED strip. The power supply circuit for the first-level light strip is a unidirectional power supply circuit, the power supply circuit for the second-level light strip is a bidirectional power supply circuit, and the power supply circuit for the third-level light strip is a three-phase power supply circuit.

2. The multi-stage low-voltage LED strip lighting system according to claim 1, characterized in that, The transformer module adopts a multi-frequency transformer regulation unit, is externally configured with a three-level power supply terminal block, and internally integrates an intelligent transformer coordination unit.

3. The multi-stage low-voltage LED strip lighting system according to claim 2, characterized in that, The transformer module is the Tridonic DALI-2 dimming power supply module.

4. The multi-stage low-voltage LED strip lighting system according to claim 1, characterized in that, In the multi-level light strip assembly, the first-level light strip, the second-level light strip, and the third-level light strip may have the same or different lengths.

5. The multi-stage low-voltage LED strip lighting system according to claim 1, characterized in that, The multi-level light strip assembly also includes an insulating shell, which is wrapped around the first-level light strip, the second-level light strip, the third-level light strip, and the bidirectional power supply connector.

6. The multi-stage low-voltage LED strip lighting system according to claim 1, characterized in that, In the multi-level light strip assembly, multiple light-emitting diodes are provided on the first-level light strip, the second-level light strip, and the third-level light strip, and the light-emitting diodes are surface-mount LEDs.

7. The multi-stage low-voltage LED strip lighting system according to claim 1, characterized in that, The bidirectional power supply connector is composed of a unidirectional conductive semiconductor device, used to realize the bidirectional power supply function of the secondary light strip and the three-phase power supply function of the tertiary light strip.

8. The multi-stage low-voltage LED strip lighting system according to claim 7, characterized in that, The unidirectional conductive semiconductor device is a unidirectional crystal diode or a thyristor.

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