DC-DC Converter Mode Switching for Stable Internal Supply Voltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mobile devices face challenges in maintaining a stable internal power supply voltage due to varying battery power supply voltages and load conditions, which can lead to power failure if the internal voltage drops below a target level.
Innovation Solution
A DC-DC converter with a controller that selects conversion modes based on the charging and discharging periods of a cycle, adjusting the timing to reset the cycle based on input and output voltages, and switches between buck, buck-boost, and boost conversion modes to maintain a stable output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the battery power supply voltage varies with charging rate, then the battery can be charged at different rates, but the internal power supply voltage becomes unstable and may drop below the target level
Solution Approach 1:
The DC-DC converter dynamically adjusts its operation by selecting different conversion modes (buck, boost, buck-boost) based on the charging rate and input voltage conditions. The controller changes the conversion mode in real-time to maintain stable output voltage despite varying battery voltage, making the system adaptive to different charging scenarios while ensuring reliability.
Solution Approach 2:
The system changes the conversion mode parameter based on the charging rate and voltage conditions. By switching between different conversion modes with different voltage transformation characteristics, the system maintains stable output voltage across varying input conditions, resolving the contradiction between adaptability and stability.
2Productivity
If the internal power supply voltage decreases when load increases, then the load can be supplied, but the voltage drops below the target level causing power failure
Solution Approach 1:
The DC-DC converter dynamically responds to load changes by adjusting the conversion mode based on the ratio of charging period to one cycle. When load increases causing voltage drop, the controller switches to appropriate conversion modes to maintain voltage above the threshold, ensuring both load supply capability and power continuity.
Solution Approach 2:
The controller continuously monitors the output voltage and adjusts the conversion mode based on feedback from the voltage level and charging rate. This feedback mechanism ensures that when load increases and voltage drops, the system automatically adjusts to maintain stable voltage and prevent power failure.
3Reliability
If multiple conversion modes are used to maintain stable output voltage, then the voltage stability is improved, but the control complexity increases
Solution Approach 1:
The control strategy segments the operation into distinct conversion modes (buck, boost, buck-boost), each optimized for specific voltage conditions. The controller selects the appropriate mode based on the charging rate and voltage ratio, simplifying the control logic compared to a fully continuous control approach while maintaining voltage stability.
Solution Approach 2:
The system uses discrete parameter changes (conversion mode selection) based on voltage ratio thresholds to maintain stability. This approach achieves voltage regulation through controlled parameter switching rather than continuous adjustment, reducing control complexity while maintaining reliability.
Data Source
AI summary
Disclosed is a DC-DC converter which includes a voltage converter configured to receive an input voltage through an input node, to convert the input voltage into an output voltage, and to output the output voltage to an output node, and a controller configured to select at least one conversion manner among a plurality of conversion manners based on a first ratio of a charging period of one cycle, to charge internal elements in the at least one conversion manner during the charging period of the one cycle, and to control the voltage converter to discharge the internal elements in the at least one conversion manner during a discharging period of the one cycle.