LED Driving Circuit Segmentation for Multi-Channel Voltage Boosting
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Solution Overview
Problem
Conventional LED driving ICs are limited to driving 4 to 8 channels of LEDs and require multiple ICs in parallel for larger applications, necessitating a common reference for boosting, which is challenging to establish effectively.
Innovation Solution
A light emitting diode driving circuit with multiple connected driving units, each equipped with comparators and output switches that compare feedback voltages and input voltages to determine a minimum voltage for boosting, ensuring efficient distribution of input voltages across units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple LED driving ICs are connected in parallel to drive more channels of LEDs, then the number of LED channels that can be driven is improved, but the complexity of establishing a common reference for boosting increases
Solution Approach 1:
The system is divided into multiple driving units, each independently comparing its feedback voltage with the input voltage and selecting the appropriate output. This segmentation allows each unit to operate autonomously while contributing to the overall multi-channel LED driving capability, resolving the contradiction by distributing the reference establishment task across multiple independent units rather than requiring a complex centralized reference system
Solution Approach 2:
Instead of establishing a common reference voltage that all driving units must follow, the patent inverts the approach by having each driving unit independently determine its own reference by comparing feedback voltage with input voltage. This inversion simplifies the system by eliminating the need for a complex common reference establishment mechanism while still achieving coordinated operation across all units
2Measurement precision
If a feedback voltage is used as a reference for boosting each driving unit, then the boosting accuracy for each unit is improved, but the difficulty of coordinating multiple units increases
Solution Approach 1:
Each driving unit performs self-service by autonomously comparing its own feedback voltage with the input voltage and selecting the appropriate output switch based on the comparison result. This self-service mechanism allows each unit to maintain accurate boosting based on its own feedback while independently determining its operation, eliminating the need for complex coordination between units
Solution Approach 2:
The patent employs feedback by using the feedback voltage from each driving unit's LEDs as one of the comparison inputs. This feedback mechanism ensures that each unit's boosting operation is accurately regulated based on its own output conditions, while the comparison logic automatically coordinates all units by selecting the minimum feedback voltage across the system
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for efficient boosting of multiple LED channels by establishing a common minimum feedback voltage, enabling effective driving of LEDs across multiple units, even in scenarios where input voltage is below a reference level, thereby improving the overall efficiency of LED driving circuits.
Implementation Method 1
a first comparator for operatively comparing a power voltage or an input voltage generated by comparing the feedback voltages with one another for the previous driving units, with the feedback voltage for the present driving unit
Implementation Method 2
The first output switch is configured for receiving the feedback voltage and enabled by an output of the first comparator when the voltage at the first input is smaller than the voltage at the second input, to output the feedback voltage to a next one of the driving units
Implementation Method 3
The second output switch is configured for operatively receiving the input voltage and enabled by the output of the first comparator when the voltage at the first input is larger than the voltage at the second input, to output the input voltage to the next one of the driving units
Implementation Method 4
a selection circuit for comparing the feedback voltage with an input voltage to output a smaller one of the feedback voltage and the input voltage to a next one of the driving units, as the input voltage for the next one of the driving units
Data Source
AI summary
A light emitting diode driving circuit includes connected driving units, each of which is configured for driving multiple channels of light emitting diodes generating a feedback voltage for the corresponding driving unit. Each of the driving units includes a selection circuit for comparing the feedback voltage with an input voltage to output a smaller one of the feedback voltage and the input voltage to a next one of the driving units, as the input voltage for the next one of the driving units.