DC-DC Converter Segmentation for OLED Display Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light emitting display devices face conduction loss and increased heat generation due to the internal resistances of DC-DC converters as the size of the display panel increases, which decreases conversion efficiency.
Innovation Solution
A DC-DC converter design that includes a first converter for generating a high power voltage and a second converter with multiple inverting converters to generate a lower power voltage, utilizing pulse width modulation (PWM) signals and a controller to manage the operation of inverting converters based on a check current, reducing the amount of current flowing through each inductor and controlling the driving mode to minimize conduction loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size of the display panel increases, then the driving current increases, but conduction loss increases due to internal resistances
Solution Approach 1:
The patent divides the single DC-DC converter into multiple converters (first converter and second converter) that operate in parallel. Each converter handles a portion of the total driving current, thereby reducing the current through each individual converter and minimizing conduction losses in the inductors and switching elements.
2Power
If the driving current increases, then the power output increases, but heat generation increases
Solution Approach 1:
The patent segments the power conversion function across multiple converters operating in parallel. By distributing the high driving current across multiple paths, each converter generates less heat, thereby reducing overall heat generation while maintaining the required power output for large display panels.
3Device complexity
If a single converter is used, then the device complexity is low, but the conversion efficiency decreases
Solution Approach 1:
The patent employs multiple converters (first converter for high power voltage, second converter with multiple inverting converters for low power voltage) instead of a single converter. This segmentation improves conversion efficiency by reducing conduction losses, while the modular structure keeps the overall device complexity manageable.
Solution Approach 2:
The patent implements dynamic control where the controller selectively activates a predetermined number of inverting converters based on the check current and connection state of the inductor. This dynamic adjustment optimizes conversion efficiency under varying operating conditions while adapting the device complexity to actual needs.
4Loss of energy
If multiple inverting converters are used, then the conversion efficiency improves, but the device complexity increases
Solution Approach 1:
The patent uses dynamic control to activate only a predetermined number of inverting converters based on actual operating conditions (check current and inductor connection state). This dynamic approach maintains high conversion efficiency when needed while reducing unnecessary complexity when full capacity is not required.
Solution Approach 2:
The patent changes the operational parameters of the inverting converters by controlling them with PWM signals and selectively activating them based on check current thresholds. This parameter-based control allows efficient power conversion while managing device complexity through conditional operation rather than always-active complex circuitry.
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 design reduces conduction loss and heat generation, enhances conversion efficiency, and allows for a smaller display device by automatically controlling the driving mode of the inverting converters based on the connection state of the inductor, thereby reducing the need for large-scale inductors and switching transistors.
Implementation Method 1
a plurality of inverting converters to generate a check current to check a connection state of an inductor
Implementation Method 2
a switch circuit including a plurality of switch transistors, the switch circuit to convert the input power voltage to the second power voltage by turning on or off one or more of the switch transistors
Data Source
AI summary
A DC-DC converter includes first and second converters. The first converter generates a first power voltage based on a power voltage from an input terminal, and outputs the first power voltage to a first output terminal. The second converter generates a second power voltage based on the input power voltage, and outputs the second power voltage to a second output terminal. The second converter includes a plurality of inverting converters and a controller. The inverting converters generate a check current to check a connection state of an inductor when the inductor is connected. The second power voltage is generated by converting the input power voltage in response to a PWM signal. The controller generates a driving control signal based on the check current to operate a predetermined number of the inverting converters connected to the inductor, and to control the inverting converters based on the driving control signal.