LED Driving Circuit Clock Delay Signal Synchronization
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Solution Overview
Problem
The existing LED driving circuits face challenges with high difficulty in PCB wiring, lower anti-interference capability of control signals, and LED display errors due to large control signal numbers and serial output data delays during cascading applications.
Innovation Solution
The integration of a clock delay circuit within the LED driving circuit to synchronize timing control signals with data control signals, reducing the number of wires on the PCB and improving signal transmission quality by ensuring accurate data acquisition and reduced interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple LED driving circuits are connected in series for cascading application, then the control capability over large number of LEDs is improved, but the wiring complexity and PCB difficulty increase significantly
Solution Approach 1:
The patent combines multiple control functions (serial data input, shift clock, latching, and constant current channel control) into a single integrated LED driving circuit chip. This merging reduces the number of separate components and interconnections needed, thereby simplifying PCB wiring while maintaining the ability to control large numbers of LEDs through cascaded configurations.
Solution Approach 2:
The LED driving circuit is designed with multi-functional capabilities: it can receive serial data, generate shift clocks, latch data, and control multiple constant current channels simultaneously. This universal design allows a single circuit module to perform multiple control tasks, reducing the overall system complexity and wiring requirements when cascading multiple circuits.
2Measurement precision
If multiple control signals are used to control each constant current channel, then the control precision is improved, but the anti-interference capability deteriorates
Solution Approach 1:
The patent merges multiple control signals (serial data, shift clock, latching signal) into a coordinated control mechanism that operates through dedicated input ports. This integration reduces signal exposure points and interconnection complexity, thereby improving anti-interference capability while maintaining control precision through the structured signal processing architecture.
Solution Approach 2:
The patent introduces an internal signal processing mechanism that acts as an intermediary between external control inputs and the constant current channel control. This intermediary structure processes and coordinates control signals internally, reducing direct external signal interactions and thereby improving anti-interference capability while preserving control precision.
3Device complexity
If serial data ports are used for data transmission, then the device complexity is reduced, but the signal transmission delay increases
Solution Approach 1:
The patent incorporates a latching mechanism that预先 (in advance) captures and stores serial data before it needs to be processed. This preliminary action allows the data to be held in a stable state, reducing the time required for data transmission and processing while maintaining the simplicity of the serial data interface.
Solution Approach 2:
The patent implements a continuous data flow mechanism where serial data is continuously shifted through the circuit stages while being latched and processed in parallel. This continuous action eliminates idle time between data transmission stages, reducing overall signal transmission delay while maintaining device simplicity.
Data Source
AI summary
A Light-Emitting Diode (LED) driving circuit and a control system includes: a driving control circuit and a constant current channel group circuit, wherein the driving control circuit includes: a logic control circuit and a clock delay circuit; the logic control circuit is connected with the constant current channel group circuit, and is configured to control the ordered switching-on or switching-off of the constant current channel group circuit by virtue of a data control signal; and the clock delay circuit is connected with the logic control circuit, configured to acquire a timing control signal synchronous with the data control signal and output the timing control signal and integrated in the LED driving circuit.