Power Conversion Structure Reducing On-State Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current power conversion structures for battery charging require multiple converters, leading to large volume, high cost, and low efficiency due to high on-state loss and complex driving circuits, especially during fast charging stages.
Innovation Solution
A power conversion structure that includes a first switch series branch and a switched capacitor series branch, where the first switch can be controlled to operate in either an off or on state, configuring the system as a three-level buck converter or a switched capacitor converter, respectively, reducing on-state loss and complexity by using only one switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two converters are used to charge the battery for different charging stages, then the charging requirements are met, but the volume and cost increase
Solution Approach 1:
The patent applies multi-functionality by enabling a single power conversion structure to perform both three-level converter operation and switched capacitor converter operation through switch configuration. The same hardware components (switches, capacitors, inductors) serve dual purposes depending on the charging stage requirements, eliminating the need for separate converters for different charging modes.
Solution Approach 2:
The patent merges the functions of two separate converters into one integrated power conversion structure. By combining the three-level converter circuitry and switched capacitor converter circuitry into a single system with shared components, the patent reduces overall system volume while maintaining the capability to handle different charging stages.
2Adaptability or versatility
If two switches are connected in parallel to both terminals of the inductor to achieve switching between converters, then the converter switching is enabled, but the on-state loss increases and efficiency decreases
Solution Approach 1:
The patent extracts the high-loss parallel switch configuration from the circuit and replaces it with an alternative switching mechanism. By removing the two parallel switches that caused high on-state loss and replacing them with a different switch arrangement (using one switch in series with the inductor and another switch configuration), the patent maintains converter switching capability while significantly reducing energy loss.
3Adaptability or versatility
If two switches are used for converter switching, then the switching between three-level converter and switched capacitor converter is achieved, but the device volume and cost increase
Solution Approach 1:
The patent makes the switches multi-functional by designing them to serve both switching and power transmission functions. The same switches used for converter mode selection also participate in the power conversion process, eliminating the need for additional dedicated switching components and reducing overall system volume.
4Adaptability or versatility
If complex driving circuits are used for multiple switches, then the switching control is achieved, but the device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the complex multi-switch driving circuit requirement by reducing the number of switches that need independent control. By redesigning the switching mechanism to require fewer actively controlled switches, the patent significantly simplifies the driving circuit complexity while maintaining the ability to switch between different converter modes.
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 on-state loss, improves efficiency, and lowers costs by minimizing the number of switches and simplifying the driving circuit, while maintaining high power levels and fast charging capabilities.
Implementation Method 1
a first flying capacitor connected between the first upper plate node and the first lower plate node
Implementation Method 2
an inductor connected between a common node of the switch S2 and the switch S3 and one terminal of an output capacitor Cout
Implementation Method 3
a first switch series branch comprising a plurality of switches connected in series
Data Source
AI summary
A power conversion structure, a power conversion system, a power conversion method, an electronic device including the power conversion structure, and a chip unit are provided. By connecting one switched capacitor series branch between a third terminal of a first switch series branch and a ground terminal, when the power conversion structure needs to operate in a switched capacitor converter mode, a direct current part of a current output from the third terminal of the first switch series branch flows to an inductor, and only an alternating current component flows through an on-state first switch, such that the on-state loss of the first switch can be greatly reduced, and the efficiency of the power conversion structure can be improved.