Integrated Power Conversion System for Battery Charging Efficiency
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Solution Overview
Problem
Current power conversion structures for battery charging, such as inductor-based buck converters and switch capacitor converters, face inefficiencies and high costs, failing to meet the requirements of quick charging and high efficiency, and have large volumes, contradicting the trend towards miniaturization, low costs, and high efficiency.
Innovation Solution
A power conversion system incorporating a first and second switch series branch, an inductor unit, a flying capacitor, and a controller that operates in multiple working modes to optimize charging stages, integrating the advantages of both inductor-based buck converters and switch capacitor converters, reducing the number of switches and sharing components to achieve high efficiency and low costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If inductor-based buck converter is used for battery charging, then power conversion can be achieved, but efficiency is low (about 92%) and volume is large
Solution Approach 1:
The patent merges the inductor-based buck converter and switch capacitor converter into a single integrated power conversion structure. The buck converter handles the constant current charging stage while the switch capacitor converter handles the constant voltage charging stage, achieving high efficiency throughout the entire charging process while reducing overall volume through component sharing and integration.
Solution Approach 2:
The integrated power conversion structure serves multiple functions: it operates as a buck converter during the constant current charging stage and as a switch capacitor converter during the constant voltage charging stage. This multi-functionality allows a single structure to handle different charging requirements, improving overall efficiency without requiring separate converters for each stage.
2Loss of energy
If collaboration between inductor-based buck converter and switch capacitor converter is used to meet different charging stage requirements, then charging efficiency can be improved, but device complexity and cost increase due to large quantity of switches
Solution Approach 1:
The patent combines the buck converter and switch capacitor converter into an integrated structure where components are shared between the two conversion paths. The inductor, capacitors, and switches are configured to serve both conversion modes, reducing the total number of components while maintaining the ability to operate in different charging stages with high efficiency.
Solution Approach 2:
Each component in the integrated structure is designed to serve multiple functions. For example, the same switches and capacitors are used in both the buck converter mode and switch capacitor converter mode, depending on the charging stage. This multi-functionality reduces component quantity and complexity while maintaining high charging efficiency across all stages.
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
The system achieves high efficiency throughout the battery charging process while supplying power to electronic devices, with reduced volume and cost, and implements stable and reliable operation by controlling switches to manage power paths and adjust output voltage effectively.
Implementation Method 1
an inductor-based buck converter... an inductor L... a typical three-level buck converter... an inductor L
Implementation Method 2
an input side capacitor Cin, and an output side capacitor Cout... a flying capacitor Cf... a capacitor unit
Data Source
AI summary
The present invention provides a power conversion system, an electronic device including the same, and an integrated circuit, and relates to the field of power supplies. By arranging a second switch series branch connected to a switch series branch of a switch capacitor converter, and matching a switch in the second switch series branch and a switch in the switch series branch of the switch capacitor converter, a function of a three-level buck converter is achieved, so that the three-level buck converter and the switch capacitor converter are integrated. The quantity of switches is reduced. The volume is small. The costs are low, and high efficiency of a whole process of charging a battery of the electronic device is achieved while supplying power to a power consumption unit of the electronic device.