Layered controllable LED lamp and cascaded control system

Abstract

The utility model relates to LED lighting technical field discloses a layered controllable LED lamps and lanterns and cascade control system. The lamps and lanterns include casing and circuit board, and the circuit board integrates drive module, LED lamp set and power module. Drive module is connected with the distribution address code through single line communication bus series connection multiple LED drive chip, and the first chip is connected with external code writer and is distributed address code, and LED lamp set is equipped with multiple sections of addressable light emitting circuit, and each circuit contains RGB LED unit and is independently controlled current control. The power module guarantees power supply stability through filter unit. The casing is equipped with detachable assembly structure and limiting clamping groove. In the cascade control system, each lamps and lanterns is connected through chip pin and forms cascade link. The utility model realizes layered independent control, reliable signal transmission and accurate current drive, supports dynamic light effect, modular extension, solves the problems of insufficient control flexibility of traditional lamps and lanterns, poor signal transmission reliability and the like, and is suitable for advertisement decoration, stage lighting and the like scenes.

Description

Technical Field

[0001] This utility model relates to the field of LED lighting technology, specifically to a layered controllable LED lamp and a cascaded control system. Background Technology

[0002] Current LED running light technology generally adopts an overall control mode, driving the entire group of LEDs with a single control signal. This results in the lights only being able to present uniform color changes or simple flashing effects, unable to achieve multi-segment independent addressing and complex dynamic color combinations. For example, if traditional running lights need to achieve layered flowing or segmented gradual changes, they require complex multi-channel control circuits. This not only increases hardware costs but also causes problems such as delays and distortions in signal transmission. In addition, traditional circuit designs often use parallel connections for LED driver chips. As the scale of the lights increases, the number of signal cables increases linearly, resulting in complex circuit layouts and reduced anti-interference capabilities. At the same time, due to the lack of independent current control mechanisms, uneven driving current in each LED unit can easily lead to brightness deviations, or even premature failure due to overload, affecting the overall lifespan of the lights.

[0003] The LED string control system disclosed in Chinese Patent Publication No. CN211090050U, while achieving periodic light emission control of three-segment LED strings through a combination of a power management unit and a control switch, and utilizing an RC filter circuit to improve anti-interference capability, still has significant limitations: its control mode relies on hardware switches to preset five lighting effects, such as single-segment brightness and gradual brightening / dimming, making it impossible to achieve dynamic light and shadow effects through software programming; the parallel control architecture requires three control lines for the three-segment LED strings, lacking long-distance transmission impedance matching design, thus limiting system scale; the RGB three primary colors lack independent current limiting, resulting in large errors in brightness uniformity; and it lacks a modular cascading interface, failing to meet the needs of multi-lamp collaborative control. Therefore, addressing the problems of insufficient control flexibility, poor signal transmission reliability, low driving accuracy, and limited scalability in existing technologies, developing an LED running light system with hierarchical independent control, reliable signal transmission, and precise current driving capabilities is of significant practical importance. Utility Model Content

[0004] This utility model overcomes the shortcomings of the above-mentioned technology and adopts the following technical solution:

[0005] A layered controllable LED lamp includes a housing 1 and a circuit board 2 installed inside the housing 1. The circuit board 2 integrates a driver module 21, LED lamp groups 22, and a power module 23. The driver module 21 includes multiple LED driver chips 212 connected in series via a single-wire communication bus 211. The first LED driver chip 212 is connected to an external programmer for assigning unique address codes to each level of the chip. The LED lamp group 22 has multiple independently addressable light-emitting circuits 221, each light-emitting circuit 221 being connected to at least one LED driver chip 212. The light-emitting circuit 221 has several RGB LED units 221a.

[0006] Furthermore, the LED driver chip 212 includes a VDD pin 212a for connecting to a power supply, a GND pin 212b for grounding, a DAI pin 212c for receiving external input signals, a PI pin 212d for receiving local control signals, a PO pin 212e for outputting signals to subsequent chips, and a first output pin 212f, a second output pin 212g, and a third output pin 212h for outputting control signals.

[0007] Furthermore, adjacent LED driver chips 212 are connected in sequence via PO pin 212e and PI pin 212d. A fourth resistor R4 is connected between the PO pin 212e of the front-stage LED driver chip 212 and the PI pin 212d of the rear-stage LED driver chip 212 for signal impedance matching.

[0008] Furthermore, the PI pin 212d of the first LED driver chip 212 is connected to a third resistor R3; the other end of the third resistor R3 is connected to the external programmer to match the programming signal level.

[0009] Furthermore, the power module 23 includes a DC input interface 231 and a filter unit 232; the filter unit 232 includes a first resistor R1, a first capacitor C1, and a second capacitor C2; the first resistor R1 is connected in series between the positive terminal of the DC input interface 231 and the VDD pin 212a of the LED driver chip 212; the first capacitor C1 is connected in parallel between the positive terminal of the DC input interface 231 and the ground terminal; the second capacitor C2 is connected in parallel between the VDD pin 212a of the LED driver chip 212 and the ground terminal.

[0010] Furthermore, the RGB LED unit 221a includes:

[0011] The red channel R has its anode connected to the positive terminal of the DC input interface 231, and its cathode connected to the first output pin 212f through the first current-limiting resistor RR1.

[0012] The green channel G has its anode connected to the positive terminal of the DC input interface 231, and its cathode connected to the second output pin 212g through the second current-limiting resistor RG1.

[0013] Blue channel B has its anode connected to the positive terminal of DC input interface 231, and its cathode connected to the third output pin 212h through the third current-limiting resistor RB1.

[0014] Furthermore, a second resistor R2 is connected to the DAI pin 212c of the LED driver chip 212; one end of the second resistor R2 is connected to the DAI pin 212c, and the other end is connected to the signal input line, which is used to adjust the level of the external input signal.

[0015] Furthermore, the housing 1 is provided with a detachable assembly structure 11 and a positioning structure 12, the positioning structure 12 being provided with limiting slots 121 that match the shape of the two side edges of the circuit board 2.

[0016] Furthermore, this application also proposes a hierarchical controllable LED lighting cascade control system, including the LED lighting fixtures described in any of the above claims, wherein each lighting fixture is connected to the PI pin 212d of the first LED driver chip 212 of the subsequent lighting fixture via the PO pin 212e of the last LED driver chip 212 of the preceding lighting fixture, in order to form a cascaded coding link and a single-wire communication bus 211.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. Layered Control: Employing a layered architecture with a one-to-one correspondence between multi-segment light-emitting circuits and LED driver chips (212), it breaks through the limitations of traditional overall control modes. Each light-emitting circuit can be individually programmed via independent address codes, supporting various dynamic light effects such as flowing, gradation, abrupt changes, and color mixing. This solves the problem that traditional lighting fixtures cannot achieve multi-segment differentiated control, meeting the needs of complex light and shadow effects in advertising decoration, stage lighting, and other scenarios.

[0019] 2. Single-wire cascaded communication: LED chips are connected in series via a single-wire communication bus, supporting up to 4096 channels. Adjacent chips only require interconnection via PO / PI pins, reducing the number of signal cables compared to traditional parallel connections. A fourth resistor is connected in series in the cascade path to achieve impedance matching, effectively suppressing signal reflection and noise interference during long-distance transmission, reducing the bit error rate, and solving the layout difficulties and poor anti-interference capabilities caused by complex cabling in traditional circuits, significantly improving system stability.

[0020] 3. Modular expansion: The housing adopts a detachable snap-fit ​​assembly structure and limit slots, which supports quick maintenance and replacement of circuit boards; the cascaded system is directly connected to the PO pin of the front stage and the PI pin of the rear stage through the front stage, which effectively reduces the wiring cost and construction complexity of large-scale projects.

[0021] 4. Precise Current Control: The red, green, and blue channels of the RGB LED unit are each connected to the output pin of the driver chip through independent current-limiting resistors. Combined with 12-bit precision PWM adjustment technology, precise current control of each channel is achieved. This design eliminates brightness deviations caused by differences in LED forward voltage, avoids overload damage, extends lamp life, and solves the core defect of uneven current in traditional driver circuits. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a block diagram of the circuit board module of this utility model;

[0024] Figure 3 This is the overall circuit diagram of the circuit board of this utility model;

[0025] Figure 4 This is a circuit diagram showing the connection between the LED driver chip and the RGB LED unit of this utility model;

[0026] Figure 5 This is a schematic diagram of the cascaded connection of the driver chips of this utility model; Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] I. Lighting Fixture Structure

[0029] like Figure 1 As shown, the LED lamp includes a housing 1 and a circuit board 2. The housing 1 adopts a detachable assembly structure 11, such as a snap-fit ​​or screw fixation, for easy maintenance. The positioning mechanism 12 is provided with a limiting groove 121 that matches the edge of the circuit board 2 to ensure that the circuit board is installed firmly. An elastic sealing structure 13, such as a silicone strip, is provided at the joints of the housing to improve waterproof and dustproof performance. The circuit board 2 integrates a driver module 21, an LED lamp group 22, and a power supply module 23. The optimized layout of each module reduces signal interference.

[0030] like Figures 2-5As shown, the driving module 21 includes multiple LED driver chips 212 connected in series. Its connection and control logic is that multiple LED driver chips 212 are connected in series through a single-wire communication bus 211. The PO pin 212e of the front-stage chip is connected to the PI pin 212d of the rear-stage chip through the fourth resistor R4 to achieve signal level matching and noise suppression. The PI pin 212d of the first LED driver chip 212 is connected to an external programmer through the third resistor R3 to assign a unique address code to each stage of the chip. The DAI pin 212c of the first LED driver chip 212 is connected to an external control signal line through the second resistor R2 to receive dimming commands. The PO pin 212e of the last-stage LED driver chip 212 is either left floating or connected to a terminating resistor.

[0031] The VDD pin 212a of the LED driver chip 212 is connected to the positive terminal of the output interface of the power module 23, and the GND pin 212b is grounded; the first output pin 212f, the second output pin 212g, and the third output pin 212h control the cathode path of the RGB LED respectively.

[0032] The LED light group 22 includes multiple independently addressable light-emitting circuits 221. The RGB LED units 221a of each light-emitting circuit 221 are connected as follows:

[0033] Red channel R: The anode of the red LED is directly connected to the positive terminal of the DC input interface 231; the cathode of the red LED is connected to the first output pin 212f of the driver chip 212 through the first current limiting resistor RR1; when the first output pin 212f outputs a low level, the red channel is turned on, and the brightness is adjusted by PWM.

[0034] Green Channel G: The green LED anode is connected to the positive terminal of DC input interface 231; the green LED cathode is connected to the second output pin 212g through the second current-limiting resistor RG1; the second output pin 212g drives the green channel G when it is low.

[0035] Blue Channel B: The anode of the blue LED is connected to the positive terminal of the DC input interface 231; the cathode of the blue LED is connected to the third output pin 212h through the third current-limiting resistor RB1; the third output pin 212h drives the blue channel B when it is low.

[0036] Each primary color channel is independently current-limited to avoid color deviation caused by differences in LED forward voltage; the cathode is directly controlled by the LED driver chip 212, and the anode is connected to the positive terminal of the DC input interface 231 to eliminate interference from the shared ground wire.

[0037] The power module 23 includes a DC input interface 231 and a filter unit 232: the DC input interface 231 is connected to an external 5-24V DC power supply, the positive terminal is used to power the LED lamp group 22 and the driver chip 212; the negative terminal GND is grounded with the GND pin 212b of the driver chip 212.

[0038] The first resistor R1 of the filter unit 232 is connected in series with the positive terminal of the DC input interface 231 to suppress surge current; the first capacitor C1 is connected in parallel between the positive terminal of the DC input interface and the ground terminal to filter out low-frequency noise; the second capacitor C2 is connected in parallel between the VDD pin 212a of the driver chip 212 and the ground terminal to filter out high-frequency noise and ensure stable power supply to the chip.

[0039] II. Signal Control Link

[0040] An external controller sends a dimming signal, which, after being leveled by the second resistor R2, is input to the DAI pin 212c of the first driver chip. After parsing the signal, the chip transmits the remaining instructions to the subsequent chips via a single-wire communication bus 211, enabling independent control of each light-emitting circuit 221. The PI pin 212d is matched to the write signal level via the third resistor R3 to ensure signal level stability during transmission and prevent false triggering. Each light-emitting circuit 221 corresponds to at least one driver chip 212. The chip controls the PWM output ratio of the RGB channels according to the instructions, achieving layered controllable effects such as gradient, chasing, and color mixing. An external programmer connects the PI pin 212d of the first chip to GND, sending a write pulse signal to trigger automatic address allocation.

[0041] III. Example 1: Independently Controllable LED Lighting Fixture

[0042] This embodiment provides a four-layer controllable LED lamp with a split injection-molded shell 1. The shell has a built-in limiting slot 121 to fix an FR-4 fiberglass circuit board 2. The surface of the circuit board is coated with conformal coating and divided into a driver area, a lamp group area, and a power supply area. The top cover and the base are fastened together by a snap-fit ​​assembly structure 11, and an elastic sealing ring 13 is embedded at the seam to form an IP65 waterproof structure, suitable for outdoor high-frequency use scenarios such as amusement parks and theme parks. The driver module 21 integrates four UCS512B3 LED driver chips 212, which are connected in a daisy chain through a single-wire communication bus 211. The PI pin 212d of the first chip is connected to an external programmer through a 1kΩ third resistor R3. Adjacent chips are connected through a 330Ω fourth resistor R4 connected in series with the PO pin 212e and the PI pin 212d. The PO pin 212e of the last chip is left floating.

[0043] An external programmer sends a 5V / 100kHz pulse signal to the PI pin 212d of the first chip to trigger automatic address allocation. The first chip initializes its address to 0x0001 and sends an "address + 1" instruction to the subsequent stage, sequentially completing address allocation from 0x0002 to 0x0004. If a chip's PO pin fails, the output channel is automatically shut down. The subsequent chip can still directly receive the programming signal through the PI pin to ensure the continuity of address allocation. Each of the four layers of light-emitting circuits 221 in the LED light group 22 corresponds to one LED driver chip 212. The anodes of the red, green, and blue channels of the six RGB LED units 221a in each layer are connected to the positive DC input, and the cathodes are connected to the first to third output pins of the chip via 240Ω current-limiting resistors. Brightness control from 0-100% is achieved through PWM adjustment.

[0044] For example, the first layer can be set with a red flowing water effect, the second layer with a green gradient, the third layer with a blue abrupt change, and the fourth layer with an RGB mixed-color breathing light. The power module 23 supports DC12V / 2A input, and the filter unit 232 uses a 10Ω first resistor R1 to suppress inrush current, a 100μF first capacitor C1 to filter out low-frequency ripple, and a 10μF second capacitor C2 to provide high-frequency decoupling, ensuring stable power supply to the driver chip 212.

[0045] When cascading, the PO pin 212e of the final stage chip of a single lamp can be connected to the PI pin 212d of the first chip in the next stage, supporting the "install first, write code later" mode. The address allocation of the entire system can be completed in one go through an external programmer, with a single stage time of <2ms, which significantly improves the efficiency of engineering deployment.

[0046] IV. Example 2: Multi-lamp cascade control system

[0047] Five sets of the aforementioned lamps are cascaded. The PO pin 212e of the last chip in the preceding lamp is connected to the PI pin 212d of the first chip in the following lamp via a 20-meter twisted-pair cable. Each lamp contains four driver chips, resulting in a total of twenty chips after cascading five sets of lamps. The controller only needs to connect to the PI pin 212d and DAI pin 212c of the first lamp to assign unique addresses 0x0001-0x0020 to all twenty driver chips. Through programming, a cross-lamp running effect can be achieved, such as chasing each lamp from the first to the fifth lamp, or synchronous color changing of all lamps. This is suitable for scenarios such as large-scale architectural outline lighting and stage lighting arrays.

[0048] In summary, this invention, through innovative drive circuit design and structural optimization, achieves layered independent control, reliable signal transmission, and precise current drive for LED running lights, demonstrating significant technological advancements and broad application prospects. Those skilled in the art can make various modifications and improvements without departing from the principles of this invention, and all such modifications and improvements should be covered within the scope of protection of this invention.

Claims

1. A layered controllable LED lamp, comprising a housing (1) and a circuit board (2) mounted within the housing (1), characterized in that, The circuit board (2) integrates a driving module (21), an LED lamp group (22), and a power supply module (23); the driving module (21) includes multiple LED driver chips (212) connected in series via a single-wire communication bus (211); the first LED driver chip (212) is connected to an external programmer to assign a unique address code to each level of the chip; the LED lamp group (22) is provided with multiple independently addressable light-emitting circuits (221), each light-emitting circuit (221) is connected to at least one LED driver chip (212); the light-emitting circuit (221) is provided with several RGB LED units (221a).

2. The layered controllable LED lighting fixture according to claim 1, characterized in that, The LED driver chip (212) includes a VDD pin (212a) for power supply, a GND pin (212b) for grounding, a DAI pin (212c) for receiving external input signals, a PI pin (212d) for receiving local control signals, a PO pin (212e) for outputting signals to subsequent chips, and a first output pin (212f), a second output pin (212g), and a third output pin (212h) for outputting control signals.

3. A layered controllable LED lighting fixture according to claim 2, characterized in that, The adjacent LED driver chips (212) are connected in sequence through the PO pin (212e) and the PI pin (212d). A fourth resistor (R4) is connected between the PO pin (212e) of the front-stage LED driver chip (212) and the PI pin (212d) of the rear-stage LED driver chip (212) for signal impedance matching.

4. A layered controllable LED lighting fixture according to claim 2, characterized in that, The PI pin (212d) of the first LED driver chip (212) is connected to a third resistor (R3); the other end of the third resistor (R3) is connected to the external programmer to match the programming signal level.

5. A layered controllable LED lighting fixture according to claim 2, characterized in that, The power module (23) includes a DC input interface (231) and a filter unit (232); the filter unit (232) includes a first resistor (R1), a first capacitor (C1) and a second capacitor (C2); the first resistor (R1) is connected in series between the positive terminal of the DC input interface (231) and the VDD pin (212a) of the LED driver chip (212); the first capacitor (C1) is connected in parallel between the positive terminal of the DC input interface (231) and the ground terminal; the second capacitor (C2) is connected in parallel between the VDD pin (212a) of the LED driver chip (212) and the ground terminal.

6. A layered controllable LED lighting fixture according to claim 2, characterized in that, The RGB LED unit (221a) includes: The red channel (R) has its anode connected to the positive terminal of the DC input interface (231) and its cathode connected to the first output pin (212f) through the first current-limiting resistor (RR1). The green channel (G) has its anode connected to the positive terminal of the DC input interface (231) and its cathode connected to the second output pin (212g) through the second current-limiting resistor (RG1); The blue channel (B) has its anode connected to the positive terminal of the DC input interface (231), and its cathode connected to the third output pin (212h) through the third current-limiting resistor (RB1).

7. A layered controllable LED lighting fixture according to claim 2, characterized in that, The LED driver chip (212) has a second resistor (R2) connected to its DAI pin (212c). One end of the second resistor (R2) is connected to the DAI pin (212c), and the other end is connected to the signal input line to adjust the level of the external input signal.

8. A layered controllable LED lighting fixture according to claim 1, characterized in that, The housing (1) is provided with a detachable assembly structure (11) and a positioning structure (12), and the positioning structure (12) is provided with a limiting slot (121) that matches the shape of the two sides of the circuit board (2).

9. A hierarchical controllable cascaded LED lighting control system, characterized in that, Including the LED luminaire as described in any one of claims 1-8, each luminaire is connected to the PI pin (212d) of the first LED driver chip (212) of the subsequent luminaire via the PO pin (212e) of the last LED driver chip (212) of the preceding luminaire, in order to form a cascaded coding link and a single-wire communication bus (211).

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