Master-Slave LED Driver Coordination for Multi-String Current Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LED driving applications, such as dynamic rear lights and fog lights, a large number of LED strings require multiple driving chips, but typical chips can only drive a few strings, necessitating complex control to meet lighting requirements.
Innovation Solution
An LED driving circuit that includes status detecting and feedback control circuits to manage bias voltage and headroom detecting voltages across multiple LED strings, allowing for efficient control and coordination between multiple driving chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple LED driving chips are used to drive a large number of LED strings, then the lighting requirements can be satisfied, but the control complexity increases
Solution Approach 1:
The system divides the LED driving function into multiple independent driving chips, each capable of driving a subset of LED strings. This segmentation allows the system to scale to drive a large number of LED strings while maintaining manageable control complexity at each chip level.
Solution Approach 2:
The patent implements feedback control circuits that monitor the driving status of LED strings and adjust the driving signals accordingly. This feedback mechanism enables automatic regulation of LED current and voltage, reducing the need for complex manual control and simplifying the overall control system.
2Productivity
If multiple LED driving chips are used to drive a large number of LED strings, then the lighting requirements can be satisfied, but the coordination between chips becomes complex
Solution Approach 1:
Each LED driving chip is designed with universal functionality to drive LED strings independently. The chips can operate autonomously and be coordinated through standardized interfaces, making it easier to manage and coordinate multiple chips without requiring complex custom control logic for each chip combination.
Solution Approach 2:
The system employs a hierarchical control structure where individual chip control functions are nested within a broader system-level coordination framework. This nesting allows each chip to maintain its own control logic while being integrated into the overall system, simplifying coordination between chips.
3Quantity of substance
If typical LED driving chips are used, then the chip count increases to drive demanded LED strings, but the control efficiency decreases
Solution Approach 1:
The patent combines multiple driving chip functions into an integrated system with shared control resources and coordinated operation. By merging the control logic and status monitoring functions across chips, the system achieves higher control efficiency despite using multiple chips to drive the required number of LED strings.
Data Source
AI summary
An LED driving system with a master-slave architecture. The LED driving system has at least two LED driving circuits which both have a first status detecting circuit, a second status detecting circuit and a first feedback control circuit. The first status detecting circuit receives a plurality of headroom detecting voltages provided by a plurality of LED strings and generates at least one self-status signal. The second status detecting circuit receives a downstream feedback signal and generates at least one downstream status signal. The first feedback control circuit generates a first feedback control signal based on the at least one self-status signal and the at least one downstream status signal. The second status detecting circuit of one LED driving circuit is coupled to the first feedback control circuit of the other LED driving circuit.