Dual-Converter DC-DC Circuit for High-Brightness Display Power
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Solution Overview
Problem
The increasing demand for higher brightness in display devices necessitates improved driving capability of DC-DC converters, which leads to increased internal resistance, conduction loss, and unnecessary power consumption and heat generation.
Innovation Solution
A DC-DC converter system comprising a master converter and a slave converter that operate sequentially based on panel current levels, with the master converter generating power independently and the slave converter assisting when current exceeds a reference level, connected in parallel to reduce internal resistance and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the driving capability of the DC-DC converter is increased to meet higher brightness demands, then the panel current range is broadened, but the internal resistance increases causing higher conduction loss and power consumption
Solution Approach 1:
The DC-DC converter is divided into a master converter and a slave converter that operate independently but cooperatively. The master converter handles base current requirements while the slave converter provides additional current when needed, allowing the system to achieve high driving capability without requiring a single high-capacity converter that would have high internal resistance.
2Productivity
If the driving capability of the DC-DC converter is increased to support broader panel current range, then the current tolerance is improved, but the internal resistance increases leading to heat generation
Solution Approach 1:
The converter is segmented into master and slave units with separate current paths. This segmentation allows the system to distribute current flow across multiple lower-resistance paths rather than forcing all current through a single high-capacity converter, thereby reducing heat generation while maintaining high current tolerance.
Solution Approach 2:
The master and slave converters are merged into a unified system that shares common inductors and output stages. This merging allows the system to combine the current-carrying capabilities of both converters while utilizing their individually lower internal resistances, achieving high current tolerance with reduced heat generation compared to a single equivalent converter.
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 effectively reduces power consumption and heat generation while maintaining or enhancing the driving capability of the DC-DC converter, optimizing performance across varying current demands.
Implementation Method 1
a first inductor, and a second inductor... the master converter may include a first outputer configured to alternately turn on a first switching element and a second switching element to generate at least part of a first inductor current which flows in the first inductor
Data Source
AI summary
A DC-DC converter includes: a master converter configured to operate to generate a panel power voltage based on an input voltage regardless of a panel current, and a slave converter configured to operate to generate the panel power voltage with the master converter based on the input voltage when the panel current is greater than a reference current. The master converter and the slave converter are connected to a first inductor.