LED screen driving controller convenient to expand

Abstract

The utility model discloses a convenient-to-expand LED screen driving controller, which belongs to the technical field of controllers and comprises a system control unit used for generating synchronous control signals and driving parameters; each driving module comprises a signal processing circuit, a phase-locked loop circuit and a driving output interface, and the phase-locked loop circuit adjusts the phase of an output clock according to the synchronous control signal of the system control unit; the expansion interface comprises a data bus interface and a power supply expansion interface and is used for connecting an external expansion driving module; wherein the system control unit transmits driving parameters to the plurality of driving modules through a data bus interface, and realizes synchronous starting of phase-locked loop circuits of the driving modules through synchronous control signals; the driving controller supports flexible expansion and has intelligent synchronization and anti-interference capabilities, and rapid deployment and stable operation of an LED screen system are realized through integration of standardized interfaces, dynamic power management and EMI suppression technologies.

Description

Technical Field

[0001] This utility model belongs to the field of controller technology, specifically relating to an easily expandable LED screen driver controller. Background Technology

[0002] With the widespread application of LED displays in outdoor advertising, stage performances, and other scenarios, the scalability and stability of driver controllers have become critical requirements. Traditional LED driver controllers mostly adopt a fixed architecture design, requiring rewiring or replacement of the main control unit when the screen size changes, resulting in high expansion costs and poor compatibility. In addition, parallel driving of multiple modules can easily cause screen tearing due to clock asynchrony, and electromagnetic interference (EMI) generated by high-frequency drive signals can easily affect the operation of peripheral equipment.

[0003] While existing technologies include solutions for expanding driver modules through cascading interfaces (such as CN107452330A), these rely on a single communication protocol, making them difficult to adapt to equipment from different manufacturers. Patent CN112735261A proposes phase-locked loop (PLL) synchronization technology, but it fails to address the issues of power fluctuations and EMI superposition during multi-module expansion. Furthermore, the physical assembly of modular drivers often relies on screws, resulting in low assembly / disassembly efficiency and inadequate heat dissipation design, which can easily lead to high-temperature throttling.

[0004] Therefore, a drive controller that supports flexible expansion and has intelligent synchronization and anti-interference capabilities is needed. Through the integration of standardized interfaces, dynamic power management and EMI suppression technology, the LED screen system can be deployed quickly and operated stably. Utility Model Content

[0005] The purpose of this invention is to provide an easily expandable LED screen driver controller to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an easily expandable LED screen driver controller, comprising:

[0007] The system control unit is used to generate synchronization control signals and drive parameters;

[0008] Multiple drive modules, each drive module includes a signal processing circuit, a phase-locked loop circuit and a drive output interface, wherein the phase-locked loop circuit adjusts the output clock phase according to the synchronization control signal of the system control unit;

[0009] Expansion interfaces, including a data bus interface and a power expansion interface, are used to connect external expansion driver modules;

[0010] The system control unit transmits drive parameters to multiple drive modules through a data bus interface and uses a synchronization control signal to achieve synchronous startup of the phase-locked loop circuits of each drive module.

[0011] It should be noted in the scheme that the phase-locked loop circuit includes a spread spectrum modulation depth controller. After receiving the synchronization start signal from the system control unit, the spread spectrum modulation depth controller adjusts the output clock frequency with a preset spread spectrum modulation range, which is set to -9.9% to 9.9%.

[0012] It is worth noting that the data bus interface of the expansion interface adopts a standardized interface protocol, including HDMI, RJ45 or CAN bus interface, and the drive output interface of each driver module supports cascading connection.

[0013] Furthermore, it should be noted that the system control unit also includes a dynamic monitoring module, which is used to monitor the working status of each drive module in real time. When a new drive module is detected to be connected, it automatically assigns an address and synchronously configures the drive parameters.

[0014] In a preferred embodiment, the power expansion interface includes an independent power supply unit and a voltage regulation circuit. The independent power supply unit supports hot-swapping, and the voltage regulation circuit dynamically adjusts the output voltage according to the number of connected drive modules.

[0015] In a preferred embodiment, the spread spectrum modulation depth controller has a built-in random number sequence generator, and the random number sequence is input to the frequency divider of the phase-locked loop circuit through a ΣΔ modulator to reduce electromagnetic interference (EMI) peaks.

[0016] In a preferred embodiment, the housing of the drive module adopts a modular splicing structure, with buckles and heat dissipation fins on both sides of the housing, and multiple drive modules are spliced ​​together horizontally or vertically through the buckles.

[0017] In one preferred embodiment, the system control unit supports multiple communication protocols, including DMX512, SPI, or wireless Wi-Fi protocols, and adapts driver modules with different expansion interfaces through a protocol conversion module.

[0018] In a preferred embodiment, the voltage regulation circuit is connected to a temperature sensor. When the operating temperature of the drive module is detected to exceed a threshold, the cooling fan is triggered to start and the output voltage is reduced.

[0019] Compared with the prior art, the LED screen driver controller provided by this utility model, which is easy to expand, has at least the following beneficial effects:

[0020] (1) Through standardized data bus interfaces (HDMI / RJ45 / CAN) and modular housing splicing structure (snap-in + heat sink), it supports the horizontal / vertical physical expansion and electrical cascading of drive modules, significantly improving the flexibility of LED screen size adjustment and making it suitable for display scenarios of different sizes. The independent power supply unit (supporting hot-swapping) and dynamic voltage regulation circuit of the power expansion interface can automatically adapt to the power supply requirements when adding a new drive module, avoiding system instability caused by sudden load changes; the system control unit drives the phase-locked loop circuit through synchronous control signals to achieve precise synchronization of the clock phase of multiple modules, eliminating the problem of screen tearing caused by timing deviation. The dynamic monitoring module automatically identifies the new module and assigns an address, and combined with the protocol conversion module (supporting DMX512 / SPI / Wi-Fi), it realizes the "plug and play" function with multi-protocol compatibility, reducing the complexity of expansion operations.

[0021] (2) By combining the spread spectrum modulation depth controller (-9.9% to 9.9% frequency offset) in the phase-locked loop circuit with a random number sequence generator and a ΣΔ modulator, electromagnetic interference energy is dispersed to a wider frequency band, reducing EMI peak by 30% to 50%, which meets industrial-grade electromagnetic compatibility standards (such as GB / T 19510.1-2023). The modular housing heat sink and temperature-voltage linkage control (temperature sensor + cooling fan) automatically reduce the output voltage and enhance heat dissipation in high-temperature environments, preventing signal distortion or component damage caused by overheating. The voltage regulation circuit dynamically adjusts the output power according to the number of connected modules. With the hot-swappable characteristics of the independent power supply unit, it ensures that the power fluctuation rate is less than 5% during the expansion process, improving the overall power supply reliability. The multi-protocol communication architecture and protocol conversion module enable the controller to be seamlessly connected to existing LED display systems (such as stage lighting control networks), reducing equipment upgrade and transformation costs. Attached Figure Description

[0022] Figure 1 This is a flowchart illustrating the present invention.

[0023] Figure 2 This is a schematic diagram of the system control unit of this utility model;

[0024] Figure 3 This is a schematic diagram of the driver module of this utility model;

[0025] Figure 4 This is a schematic diagram of the extended interface process of this utility model.

[0026] In the diagram: 10. System control unit; 11. Dynamic monitoring module; 12. Protocol conversion module; 20. Drive module; 21. Signal processing circuit; 22. Phase-locked loop circuit; 221. Spread spectrum modulation depth controller; 222. Random number sequence generator; 223. ΣΔ modulator; 224. Frequency divider; 23. Drive output interface; 24. Housing; 241. Clip; 242. Heat sink fins; 30. Expansion interface; 31. Data bus interface; 32. Power expansion interface; 321. Independent power supply unit; 322. Voltage regulation circuit; 323. Temperature sensor; 324. Cooling fan. Detailed Implementation

[0027] The present invention will be further described below with reference to the embodiments.

[0028] Please see Figure 1-4 This utility model provides an easily expandable LED screen driver controller, comprising:

[0029] System control unit 10 is used to generate synchronization control signals and drive parameters;

[0030] Multiple drive modules 20, each drive module includes a signal processing circuit 21, a phase-locked loop circuit 22 and a drive output interface 23. The phase-locked loop circuit 22 adjusts the output clock phase according to the synchronization control signal of the system control unit 10.

[0031] The expansion interface 30 includes a data bus interface 31 and a power expansion interface 32, which are used to connect an external expansion driver module.

[0032] The system control unit 10 transmits driving parameters to multiple drive modules 20 through the data bus interface 31, and realizes the synchronous start of the phase-locked loop circuit 22 of each drive module 20 through the synchronous control signal.

[0033] Further as Figure 3 As shown, it is worth noting that the phase-locked loop circuit 22 includes a spread spectrum modulation depth controller 221. After receiving the synchronization start signal from the system control unit 10, the spread spectrum modulation depth controller 221 adjusts the output clock frequency with a preset spread spectrum modulation range. The spread spectrum modulation range is set to -9.9% to 9.9%. By using the preset spread spectrum modulation range (-9.9% to 9.9%), the clock signal spectrum energy is dispersed, the electromagnetic interference (EMI) peak is reduced, and the system electromagnetic compatibility is improved.

[0034] Further as Figure 3As shown, it is worth noting that the data bus interface 31 of the expansion interface 30 adopts a standardized interface protocol, including HDMI, RJ45 or CAN bus interfaces, and the driver output interface 23 of each driver module 20 supports cascading connection. Through standardized interfaces and cascading architecture, standardized data interfaces such as HDMI / RJ45 / CAN are adopted, and driver module cascading connection is supported, simplifying expansion operation and being compatible with the access of various external devices.

[0035] Further as Figure 1 As shown, it is worth noting that the system control unit 10 also includes a dynamic monitoring module 11, which is used to monitor the working status of each drive module 20 in real time. When a new drive module is detected to be connected, it automatically assigns an address and configures the drive parameters synchronously. Through dynamic monitoring and automatic configuration, the new drive module is detected in real time and the address and synchronous parameters are automatically assigned, realizing the "plug and play" expansion function and reducing the cost of manual debugging.

[0036] The LED screen driver controller of this invention achieves modular expansion and stable driving through multi-level collaborative control:

[0037] Synchronization signal generation and distribution: The system control unit (10) generates synchronization control signals and drive parameters (such as PWM duty cycle and scanning frequency) according to display requirements, and distributes the parameters to each drive module (20) through the data bus interface (31). The synchronization control signal simultaneously triggers the phase-locked loop circuit (22) of all drive modules (20) to align the clock phases of each module and eliminate timing deviations when multiple modules drive in parallel.

[0038] Dynamic expansion of driver modules: When a new driver module is connected to the expansion interface (30), the dynamic monitoring module (11) detects the new module in real time, automatically assigns a unique address to it, and sends configuration parameters through the data bus interface (31). The independent power supply unit (321) of the power expansion interface (32) supports hot-swapping, and the voltage regulation circuit (322) dynamically increases the output voltage according to the current number of modules to ensure stable power supply for the new module.

[0039] Signal processing and EMI suppression: The signal processing circuit (21) of each drive module (20) converts the received drive parameters into LED drive signals, which are then output to the drive interface (23) after synchronization by the phase-locked loop circuit (22). In the phase-locked loop circuit, the spread spectrum modulation depth controller (221) dynamically adjusts the clock frequency within a preset range (-9.9% to 9.9%), while the random number sequence generator (222) disturbs the frequency divider (224) through the ΣΔ modulator (223) to disperse electromagnetic radiation energy, thereby reducing the EMI peak value by more than 30%.

[0040] Environmental adaptive control: The temperature sensor (323) monitors the temperature of the drive module in real time. When the temperature exceeds the limit, it triggers the cooling fan (324) to force heat dissipation and links the voltage regulation circuit (322) to reduce the output voltage to prevent overheating damage. The snap-fit ​​(241) and heat dissipation fins (242) of the modular housing (24) support horizontal / vertical expansion splicing, improving heat dissipation efficiency and physical expansion flexibility.

[0041] As can be seen from the above working process: by using the preset spread spectrum modulation range (-9.9% to 9.9%), the clock signal spectrum energy is dispersed, reducing the peak electromagnetic interference (EMI) and improving the system's electromagnetic compatibility. Through standardized interfaces and cascading architecture, standardized data interfaces such as HDMI / RJ45 / CAN are adopted, and cascading connection of driver modules is supported, simplifying expansion operations and being compatible with the access of various external devices. Through dynamic monitoring and automatic configuration, new driver modules are detected in real time and addresses and synchronization parameters are automatically assigned, realizing "plug and play" expansion functions and reducing manual debugging costs.

[0042] Further as Figure 4 As shown, it is worth noting that the power expansion interface 32 includes an independent power supply unit 321 and a voltage regulation circuit 322. The independent power supply unit 321 supports hot-swapping, and the voltage regulation circuit 322 dynamically adjusts the output voltage according to the number of connected drive modules. Through the intelligent power expansion design, the independent power supply unit supports hot-swapping, and the voltage regulation circuit dynamically adjusts the voltage according to the number of modules to ensure power stability during expansion and avoid voltage fluctuations.

[0043] Further as Figure 3 As shown, it is worth noting that the spread spectrum modulation depth controller 221 has a built-in random number sequence generator 222. The random number sequence is input to the frequency divider 224 of the phase-locked loop circuit 22 through the ΣΔ modulator 223 to reduce the electromagnetic interference (EMI) peak. EMI is optimized by random sequence modulation. The frequency divider of the phase-locked loop is further dispersed by perturbing the random number sequence generator and the ΣΔ modulator, thereby reducing the intensity of high-frequency EMI radiation.

[0044] Further as Figure 3 As shown, it is worth noting that the housing 24 of the drive module 20 adopts a modular splicing structure. The housing 24 has buckles 241 and heat dissipation fins 242 on both sides. Multiple drive modules 20 can be spliced ​​horizontally or vertically through buckles 241. Through the modular housing structure and buckle splicing design, the drive modules can be flexibly expanded horizontally / vertically. The heat dissipation fins improve heat dissipation efficiency and adapt to high-density installation scenarios.

[0045] Further as Figure 2As shown, it is worth noting that the system control unit 10 supports multiple communication protocols, including DMX512, SPI, or wireless Wi-Fi protocols, and adapts to driver modules with different expansion interfaces through the protocol conversion module 12. Through multi-protocol communication support, it is compatible with protocols such as DMX512, SPI, and Wi-Fi. The protocol conversion module adapts to driver modules with different interfaces, thereby enhancing system compatibility.

[0046] Further as Figure 4 As shown, it is worth noting that the voltage regulation circuit 322 is connected to the temperature sensor 323. When the operating temperature of the drive module 20 exceeds the threshold, the cooling fan 324 is triggered to start and the output voltage is reduced. Through temperature-voltage linkage control, the temperature sensor triggers the cooling fan to start and synchronously reduces the voltage, preventing component damage under high temperature conditions and improving the long-term reliability of the system.

[0047] In summary: The intelligent power supply expansion design features independent power supply units that support hot-swapping. The voltage regulation circuit dynamically adjusts the voltage based on the number of modules, ensuring power stability during expansion and preventing voltage fluctuations. EMI is optimized through random sequence modulation, and the phase-locked loop frequency divider is further dispersed by a random number sequence generator and ΣΔ modulator to further reduce high-frequency EMI radiation intensity. The modular housing structure and snap-fit ​​design allow for flexible horizontal / vertical expansion of the drive modules. Heat sinks improve heat dissipation efficiency, adapting to high-density installation scenarios. A protocol conversion module adapts to drive modules with different interfaces, enhancing system compatibility. Temperature-voltage linkage control, where a temperature sensor triggers the cooling fan to start and simultaneously reduces the voltage, prevents component damage under high-temperature conditions and improves long-term system reliability.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An easily expandable LED screen driver controller, characterized in that, include: The system control unit (10) is used to generate synchronization control signals and drive parameters; Multiple drive modules (20), each drive module (20) includes a signal processing circuit (21), a phase-locked loop circuit (22) and a drive output interface (23), wherein the phase-locked loop circuit (22) adjusts the output clock phase according to the synchronization control signal of the system control unit (10); An expansion interface (30) includes a data bus interface (31) and a power expansion interface (32) for connecting an external expansion driver module (20); The system control unit (10) transmits driving parameters to multiple drive modules (20) through the data bus interface (31) and realizes the synchronous start of the phase-locked loop circuit (22) of each drive module (20) through the synchronous control signal.

2. The LED screen driver controller according to claim 1, characterized in that: The phase-locked loop circuit (22) includes a spread spectrum modulation depth controller (221). After receiving the synchronization start signal from the system control unit (10), the spread spectrum modulation depth controller (221) adjusts the output clock frequency with a preset spread spectrum modulation range, which is set to -9.9% to 9.9%.

3. The LED screen driver controller according to claim 1, characterized in that: The data bus interface (31) of the expansion interface (30) adopts a standardized interface protocol, including HDMI, RJ45 or CAN bus interface, and the drive output interface (23) of each drive module (20) supports cascading connection.

4. The LED screen driver controller according to claim 1, characterized in that: The system control unit (10) also includes a dynamic monitoring module (11) for real-time monitoring of the working status of each drive module (20). When a new drive module (20) is detected to be connected, it automatically assigns an address and synchronously configures the drive parameters.

5. The LED screen driver controller according to claim 1, characterized in that: The power expansion interface (32) includes an independent power supply unit (321) and a voltage regulation circuit (322). The independent power supply unit (321) supports hot-swapping, and the voltage regulation circuit (322) dynamically adjusts the output voltage according to the number of connected drive modules (20).

6. The LED screen driver controller according to claim 2, characterized in that: The spread spectrum modulation depth controller (221) has a built-in random number sequence generator (222), and the random number sequence is input to the frequency divider (224) of the phase-locked loop circuit (22) through the ΣΔ modulator (223) to reduce the electromagnetic interference (EMI) peak.

7. The LED screen driver controller according to claim 1, characterized in that: The housing (24) of the drive module (20) adopts a modular splicing structure. The housing (24) is provided with buckles (241) and heat dissipation fins (242) on both sides. Multiple drive modules (20) are spliced ​​together horizontally or vertically through buckles (241).

8. The LED screen driver controller according to claim 1, characterized in that: The system control unit (10) supports multiple communication protocols, including DMX512, SPI or wireless Wi-Fi protocol, and adapts to driver modules (20) with different expansion interfaces through the protocol conversion module (12).

9. The LED screen driver controller according to claim 5, characterized in that: The voltage regulation circuit (322) is connected to the temperature sensor (323). When the operating temperature of the drive module (20) exceeds the threshold, the cooling fan (324) is triggered to start and the output voltage is reduced.

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