SIMO Converter Current Conduction Sequencing for LED Linearity
Find Innovative SolutionsGenerate Solutions
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 schemes such as consolidated, interleaved, and commutated arrangements, and switch timing schemes like fixed time and fixed ratio schemes to optimize current distribution and maintain linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If current conduction is managed through multiple output channels in SIMO converters, then the power conversion capability is improved, but the linearity and performance consistency deteriorates due to configuration changes
Solution Approach 1:
The patent segments the current conduction process into distinct phases by implementing separate charge periods for different output channels. Each output channel is charged independently during its designated time window, allowing the controller to manage current distribution precisely. This segmentation enables multi-output power conversion while maintaining linear performance by preventing channel interference.
Solution Approach 2:
The patent implements periodic charge and discharge cycles for each output channel in a controlled sequence. Each channel undergoes periodic charging during its assigned charge period, followed by sequential discharge phases. This periodic action with non-overlapping timing ensures that current conduction remains predictable and linear, even when serving multiple outputs simultaneously.
2Productivity
If charge periods for different output channels overlap, then the productivity is improved, but the current management complexity and performance degradation increases
Solution Approach 1:
The patent employs dynamic control of switching elements to sequentially enable and disable different output channels during charge and discharge phases. The controller dynamically adjusts the timing and duration of charge periods for each channel based on load requirements, optimizing current utilization without allowing overlapping charge periods. This dynamic management maintains simplicity while improving productivity.
Solution Approach 2:
Each output channel is equipped with its own switching element that autonomously controls its charge and discharge cycles based on controller signals. This self-service approach allows each channel to manage its own current flow independently during its designated time window, reducing the overall control complexity while maintaining high productivity through efficient sequential operation.
3Adaptability or versatility
If configuration changes are made to optimize for specific loads, then the adaptability is improved, but the linearity and susceptibility to performance degradation worsens
Solution Approach 1:
The patent implements a universal control architecture that can serve multiple output channels with different load configurations through a single inductor. The controller is designed to universally manage charge and discharge sequences for any number of output channels, adapting to various load requirements while maintaining the same linear conversion ratio principles. This multi-functional approach enables configuration flexibility without sacrificing linearity.
Data Source
AI summary
A system includes a single-inductor-multiple-out (SIMO) converter that includes storage circuitry in communication with a plurality of output channels, and a controller that is configured to output one or more signals to alternatingly conduct current through the output channels over a plurality of switching cycles. The controller may determine fixed ratios of channel conduction periods between the plurality of output channels and set channel conduction periods for each switching cycle based on the fixed ratios. In addition or alternatively, the controller may determine an arrangement of orders in which to conduct current over the switching cycles. The arrangement may include an order for a current switching cycle that is a reverse order of an order for a previously switching cycle.