Driver System Reverse Current Prevention via Mode Transition Delay
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Solution Overview
Problem
In portable electronic devices, maintaining consistent LED brightness across multiple LEDs powered by a depleting battery is challenging due to variations in battery voltage and LED forward voltage, leading to inefficient power usage and potential reverse current flow.
Innovation Solution
A system with multiple operating modes (1×, 1.5×, 2×) for driving LEDs, where the power stage component transitions between modes based on battery voltage and LED voltage, with adaptive mode change component delaying transitions to prevent reverse current flow by ensuring sufficient voltage for LED operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the system transitions between operating modes to maintain LED brightness as battery depletes, then LED brightness consistency is improved, but reverse current may flow into the power source
Solution Approach 1:
The system performs preliminary action by delaying the mode transition until the battery voltage is sufficiently low. This prevents reverse current from flowing into the power source while still maintaining LED brightness consistency. The delay mechanism ensures that the output voltage remains higher than the battery voltage throughout the transition period, preventing harmful reverse current flow.
2Use of energy by moving object
If the system uses multiple operating modes with different power delivery multiples, then power efficiency is improved, but system complexity increases
Solution Approach 1:
The system implements dynamics by providing multiple operating modes (1×, 1.5×, 2×) that allow the power stage component to adapt its power delivery based on battery voltage levels. This dynamic operation improves power efficiency by selecting appropriate modes, while the mode change component manages the complexity through controlled transitions between modes.
Solution Approach 2:
The system applies parameter changes by varying the power delivery multiple (1×, 1.5×, 2×) according to battery voltage conditions. This allows the system to optimize power efficiency across different battery states while the mode change component ensures smooth transitions, balancing efficiency gains with manageable system complexity.
3Reliability
If mode transition is delayed to prevent reverse current, then power source reliability is improved, but transition response time increases
Solution Approach 1:
The system uses preliminary action by implementing a delay mechanism that waits for appropriate conditions before transitioning modes. This delay prevents reverse current flow into the power source by ensuring the output voltage remains higher than battery voltage during transitions, protecting the power source while eventually achieving the necessary mode change.
Data Source
AI summary
In one embodiment, a method is provided for preventing reverse input current from flowing into a power source. The method includes: providing a system having a plurality of operating modes for driving a load, wherein in each operating mode the power delivered to the load is a multiple of the power output from the power source; transitioning the system from one operating mode into another operating mode under predetermined conditions; if the power delivered to the load is greater than the power delivered to the power source, delaying the transition of the system from the one operating mode into the other operating mode