SIMO Converter Current Measurement Circuitry for LED Lighting
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Solution Overview
Problem
Single-inductor-multiple-output (SIMO) converters face challenges in maintaining performance linearity due to configuration changes, particularly in managing current conduction through multiple output channels, which affects the consistency and efficiency of light output in LED lighting applications.
Innovation Solution
The implementation of a SIMO converter system that includes a controller to monitor and control current conduction through multiple output channels, utilizing various sequencing and timing schemes such as fixed time and fixed ratio switch timing schemes, and determining the order of current conduction to ensure consistent and desired light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current is discharged through multiple output channels in SIMO converter, then power distribution capability is improved, but current conduction management complexity increases
Solution Approach 1:
The patent segments the current conduction management into distinct phases (first output channel conduction phase, second output channel conduction phase) with different switching configurations. Each phase has dedicated switching elements (first switching element, second switching element) that are controlled independently, simplifying the overall management complexity while maintaining multi-output capability
Solution Approach 2:
The patent implements dynamic switching configurations where the switching elements change states between different conduction phases. The first switching element is configured in a first state during the first phase and in a second state during the second phase, allowing the system to adapt its topology dynamically to manage current conduction efficiently across multiple channels
2Ease of operation
If switching configurations are changed to manage current conduction, then current distribution control is improved, but conversion ratio linearity deteriorates
Solution Approach 1:
The patent employs periodic switching actions where the switching elements oscillate between different states in a regular cycle. The switching elements transition between first and second states in periodic phases, which helps maintain average conversion ratio linearity while achieving precise instantaneous current distribution control through the periodic switching waveform
3Measurement precision
If multiple switching elements are used to control current conduction phases, then current conduction control precision is improved, but device complexity increases
Solution Approach 1:
The patent designs switching elements that perform multiple functions: they control current conduction in specific phases, regulate voltage levels, and maintain isolation between output channels. Each switching element is configured to handle multiple operational requirements simultaneously, reducing the total number of components needed while maintaining high control precision
Data Source
AI summary
A system includes a single-inductor-multiple-out (SIMO) converter that includes a plurality of output channels, each channel comprising a load, and integrating circuitry in communication with the output channels. The integrated circuitry may be configured to output a signal indicative of a time-accumulated average amount of current drawn through the loads over a sample period. The signal may be used to compare the average current drawn through the output channel with a desired current draw, and to determine whether to change one or more timing parameters used to control the current flow through the SIMO converter.