Buck-Boost Converter for Dynamic Backlight Voltage Control
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Solution Overview
Problem
Information handling systems face challenges in optimizing power delivery across subsystems with different voltage requirements, leading to power losses as they must choose between low-voltage or high-voltage subsystems for optimization, neglecting the needs of the other subsystem.
Innovation Solution
Implementing a buck-boost conversion system with an embedded controller that determines the characteristics of the display and adjusts voltage using buck-boost converters to satisfy dissimilar power needs, allowing for dynamic voltage adjustment based on the operating state of subsystems and power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the system selects low-voltage subsystem optimization, then low-voltage subsystem efficiency is improved, but high-voltage subsystem suffers power losses
Solution Approach 1:
The patent introduces a voltage conversion circuit as an intermediary component between the power source and subsystems. This circuit dynamically converts voltage levels to match the requirements of different subsystems, allowing the system to serve both low-voltage and high-voltage loads simultaneously without excessive power losses.
Solution Approach 2:
The system employs dynamic voltage adjustment capabilities where the voltage conversion circuit can adapt its output voltage in real-time based on the operational state and power requirements of connected subsystems. This dynamic behavior enables the system to optimize power delivery for whichever subsystem is currently active.
2Loss of energy
If the system selects high-voltage subsystem optimization, then high-voltage subsystem efficiency is improved, but low-voltage subsystem suffers power losses
Solution Approach 1:
The voltage conversion circuit serves as a mediator that receives high-voltage input and converts it to appropriate low-voltage levels for low-voltage subsystems. This intermediary approach eliminates the need to choose between optimizing for high-voltage or low-voltage subsystems, as both can be served efficiently from a single high-voltage power source.
Solution Approach 2:
The system changes the voltage parameter dynamically based on the operational requirements of different subsystems. The voltage conversion circuit adjusts its output voltage parameter to match the specific needs of either high-voltage or low-voltage subsystems, thereby minimizing power losses regardless of which subsystem is active.
3Loss of energy
If fixed voltage architecture is used, then system design is simplified, but power efficiency is reduced due to inability to meet specific voltage needs
Solution Approach 1:
The voltage conversion circuit provides multi-functionality by serving both high-voltage and low-voltage subsystems from a single circuit design. This universal approach replaces the need for separate voltage regulation circuits for different subsystems, actually reducing overall system complexity while improving power efficiency.
Solution Approach 2:
The system employs parameter changes in the voltage domain to optimize power delivery. By dynamically adjusting the output voltage parameter of the conversion circuit, the system achieves low battery conversion loss (2%) while adapting to the specific voltage requirements of different subsystems during operation.
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 approach reduces battery conversion loss to 2% by optimizing power delivery across subsystems, providing a 'right-sized' voltage architecture that meets specific needs, thereby extending battery life and improving system-wide power efficiency.
Implementation Method 1
controlling a buck-boost converter to reduce a voltage applied to the backlight
Data Source
AI summary
Systems and methods for backlight dimming via buck-boost conversion in an information handling system (IHS) are described. In some embodiments, an IHS may include an embedded controller (EC), and a memory coupled to the EC, the memory having program instructions stored thereon that, upon execution, cause the EC to: determine a characteristic of a display having a backlight; and dim the display by controlling a buck-boost converter to reduce a voltage applied to the backlight.