Power Management Device With Intermediate Voltage Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power management devices for display devices face inefficiencies and increased power consumption due to low efficiency in generating negative driving voltages and high power loss within the inverting buck-boost converter, especially when the negative driving voltage is large.
Innovation Solution
A power management device is designed with a first, second, and third power conversion device to output driving voltages, where the third driving voltage is optimized to be between the first and second driving voltages, minimizing total power consumption by adjusting the first and second driving voltages based on the third.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an inverting buck-boost converter is used to generate negative driving voltage, then the driving voltage can be generated, but the efficiency is very low and power consumption increases
Solution Approach 1:
The patent segments the power conversion function by separating positive driving voltage generation (first power conversion device) and negative driving voltage generation (second power conversion device), with a third power conversion device generating an intermediate voltage. This segmentation allows each device to operate in its optimal efficiency range, avoiding the high power loss associated with using a single inverting buck-boost converter for the full voltage range.
Solution Approach 2:
The patent changes the operating parameters by introducing a third driving voltage that is optimized to be between the first and second driving voltages. By adjusting the third driving voltage to minimize the sum of power consumptions, the system achieves optimal efficiency while maintaining the required positive and negative driving voltages for the display panel.
2Power
If the negative driving voltage is increased, then the driving capability is improved, but the internal voltage of the switch increases and power loss increases
Solution Approach 1:
The patent introduces a third power conversion device that generates an intermediate driving voltage between the positive and negative voltages. This intermediary voltage serves as a mediator that reduces the voltage stress on switches in the second power conversion device, thereby reducing power loss while still enabling the generation of the required negative driving voltage for high-power operation.
3Adaptability or versatility
If a large potential difference between high-potential and low-potential power supplies is used, then the voltage range is expanded, but efficiency is lowered and power consumption increases
Solution Approach 1:
The patent segments the voltage conversion process into three separate power conversion devices, each handling a specific voltage range. This segmentation allows the system to cover a wide voltage range (from high positive to low negative voltages) while maintaining high efficiency in each segment, avoiding the efficiency loss that would occur with a single large potential difference conversion.
Solution Approach 2:
The patent optimizes the third driving voltage parameter to minimize total power consumption. By dynamically adjusting the third driving voltage to be between the first and second driving voltages, the system adapts to different operating conditions while maintaining optimal efficiency across the entire voltage range, thus resolving the contradiction between wide voltage coverage and low power consumption.
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 configuration reduces power consumption by optimizing the sum of power consumptions from the first and second driving voltages, decreases the absolute value of other driving voltages, and reduces internal switch voltage, thereby lowering overall power loss and cost while minimizing component size.
Implementation Method 1
a first power conversion device configured to output a first driving voltage; a second power conversion device configured to output a second driving voltage; and a third power conversion device configured to output a third driving voltage
Data Source
AI summary
A power management device may include a first power conversion device configured to output a first driving voltage, a second power conversion device configured to output a second driving voltage, and a third power conversion device configured to output a third driving voltage. The first driving voltage may be changed in a range of positive voltage and the second driving voltage may be changed in a range of negative voltage. The third driving voltage may be smaller than the first driving voltage and greater than the second driving voltage, and may be changed as a driving voltage at a point where a sum of a first power consumption due to the changed first driving voltage and a second power consumption due to the changed second driving voltage is the smallest.