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CN-224232339-U - LED screen drive controller convenient to expand

CN224232339UCN 224232339 UCN224232339 UCN 224232339UCN-224232339-U

Abstract

The utility model discloses a LED screen drive controller convenient to extension belongs to controller technical field, including the system control unit for generating synchronous control signal and driving parameter; the system comprises a plurality of driving modules, a control unit and a control unit, wherein 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 a synchronous control signal of the system control unit; the expansion interface comprises a data bus interface and a power expansion interface and is used for connecting an external expansion driving module; the system control unit transmits driving parameters to the plurality of driving modules through the data bus interface, and realizes synchronous starting of phase-locked loop circuits of the driving modules through synchronous control signals; the utility model discloses support nimble extension, possess intelligent synchronization and interference killing feature's drive controller, through standardized interface, dynamic power management and EMI suppression technical integration, realize the quick deployment and the steady operation of LED screen system.

Inventors

  • Rao Yunzhou
  • Rao Yunrong
  • Xiao nanjing

Assignees

  • 深圳市利美特科技有限公司

Dates

Publication Date
20260512
Application Date
20250606

Claims (9)

  1. 1. An LED screen drive controller for facilitating expansion, comprising: A system control unit (10) for generating a synchronization control signal and a driving parameter; A plurality of driving modules (20), each driving module (20) comprising a signal processing circuit (21), a phase-locked loop circuit (22) and a driving output interface (23), the phase-locked loop circuit (22) adjusting the output clock phase according to a synchronization control signal of the system control unit (10); an expansion interface (30) comprising a data bus interface (31) and a power expansion interface (32) for connecting to an external expansion drive module (20); The system control unit (10) transmits driving parameters to the plurality of driving modules (20) through the data bus interface (31), and realizes synchronous starting of the phase-locked loop circuits (22) of the driving modules (20) through synchronous control signals.
  2. 2. The LED screen driving controller according to claim 1, wherein the phase-locked loop circuit (22) comprises a spread spectrum modulation depth controller (221), and the spread spectrum modulation depth controller (221) adjusts the output clock frequency in a preset spread spectrum modulation range after receiving the synchronous start signal of the system control unit (10), wherein the spread spectrum modulation range is set to-9.9% to 9.9%.
  3. 3. The LED screen drive controller according to claim 1, wherein the data bus interface (31) of the expansion interface (30) adopts a standardized interface protocol, including HDMI, RJ45 or CAN bus interfaces, and the drive output interface (23) of each drive module (20) supports a cascade connection.
  4. 4. The LED screen driving controller according to claim 1, wherein the system control unit (10) further comprises a dynamic monitoring module (11) for monitoring the working state of each driving module (20) in real time, and when the newly added driving module (20) is monitored to be accessed, automatically distributing addresses and synchronously configuring driving parameters.
  5. 5. The LED screen driving controller according to claim 1, wherein the power expansion interface (32) comprises an independent power supply unit (321) and a voltage regulating circuit (322), the independent power supply unit (321) supports hot plug, and the voltage regulating circuit (322) dynamically regulates output voltage according to the number of connected driving modules (20).
  6. 6. The LED screen driving controller according to claim 2, wherein the spread spectrum modulation depth controller (221) has a random number sequence generator (222) built in, and the random number sequence is inputted to a frequency divider (224) of the phase-locked loop circuit (22) through a ΣΔ modulator (223) to reduce electromagnetic interference (EMI) peaks.
  7. 7. The LED screen driving controller according to claim 1, wherein the shell (24) of the driving module (20) adopts a modularized splicing structure, buckles (241) and radiating fins (242) are arranged on two sides of the shell (24), and the driving modules (20) are transversely or longitudinally expanded and spliced through the buckles (241).
  8. 8. The LED screen drive controller of claim 1, wherein the system control unit (10) supports a plurality of communication protocols including DMX512, SPI or wireless Wi-Fi protocols, and adapts the drive modules (20) of different expansion interfaces through the protocol conversion module (12).
  9. 9. The LED screen driving controller according to claim 5, wherein the voltage regulating circuit (322) is connected with the temperature sensor (323), and when detecting that the operating temperature of the driving module (20) exceeds a threshold value, the heat dissipating fan (324) is triggered to start and reduce the output voltage.

Description

LED screen drive controller convenient to expand Technical Field The utility model belongs to the technical field of controllers, and particularly relates to an LED screen driving controller convenient to expand. Background With the wide application of the LED display screen in outdoor advertising, stage performance and other scenes, the expansion capability and stability of the driving controller become key requirements. The traditional LED driving controller mostly adopts a fixed architecture design, and needs to rewire or change a main control unit when the screen size is changed, so that the problems of high expansion cost and poor compatibility exist. In addition, when the multi-module parallel driving is performed, display images are easily torn due to asynchronous clocks, and electromagnetic interference (EMI) generated by high-frequency driving signals easily affects operation of peripheral equipment. In the prior art, although a scheme (such as CN107452330 a) for expanding a driving module through a cascade interface exists, it depends on a single communication protocol, and is difficult to adapt to different manufacturer devices, and patent CN112735261a proposes a phase-locked loop synchronization technology, but does not solve the problem of power supply fluctuation and EMI superposition during multi-module expansion. Meanwhile, the physical splicing of the modularized driver is mostly fixed by screws, the disassembly and assembly efficiency is low, and the heat dissipation design is insufficient and high-temperature frequency reduction is easy to cause. Therefore, a driving controller supporting flexible expansion and having intelligent synchronization and anti-interference capabilities is needed, 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. Disclosure of utility model The utility model aims to provide an LED screen driving controller which is convenient to expand so as to solve the problems in the background technology. In order to achieve the above purpose, the utility model provides a technical scheme that an LED screen driving controller convenient to expand comprises: the system control unit is used for generating synchronous control signals and driving parameters; The system comprises a plurality of driving modules, a control unit and a control unit, wherein 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 a synchronous control signal of the system control unit; The expansion interface comprises a data bus interface and a power expansion interface and is used for connecting an external expansion driving module; The system control unit transmits driving parameters to the plurality of driving modules through the data bus interface, and synchronous starting of phase-locked loop circuits of the driving modules is realized through synchronous control signals. In the scheme, the phase-locked loop circuit comprises a spread spectrum modulation depth controller, wherein after the spread spectrum modulation depth controller receives a synchronous starting signal of a system control unit, the output clock frequency is adjusted in a preset spread spectrum modulation range, and the spread spectrum modulation range is set to be-9.9% to 9.9%. It is further worth to describe that the data bus interface of the expansion interface adopts a standardized interface protocol, including HDMI, RJ45 or CAN bus interfaces, and the driving output interface of each driving module supports cascade connection. It should be further noted that, the system control unit further includes a dynamic monitoring module, configured to monitor the working state of each driving module in real time, and when detecting that a new driving module is connected, automatically allocate an address and synchronously configure driving parameters. As a preferred embodiment, the power expansion interface includes an independent power supply unit and a voltage regulating circuit, the independent power supply unit supports hot plug, and the voltage regulating circuit dynamically adjusts the output voltage according to the number of connected driving modules. As a preferred embodiment, the spread spectrum modulation depth controller incorporates a random number sequence generator, which is input to a frequency divider of a phase locked loop circuit through a ΣΔ modulator to reduce electromagnetic interference (EMI) peaks. As a preferred implementation mode, the shell of the driving module adopts a modularized splicing structure, buckles and radiating fins are arranged on two sides of the shell, and the driving modules are transversely or longitudinally expanded and spliced through the buckles. As a preferred embodiment, the system control unit supports mu