Power Converter Switched Capacitor Topology Reducing Driving Circuit Complexity
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Solution Overview
Problem
Existing power converters require a large number of power switches in series, complicating the driving circuit and increasing costs, while also facing inefficiencies in voltage conversion and electromagnetic interference.
Innovation Solution
The power converter design minimizes the number of power switches in series by using switched capacitor circuits with phase-shifted control and resonant operation, reducing switching losses and improving efficiency through reduced current ripple and EMI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large number of power switches are connected in series to achieve voltage conversion, then the voltage conversion capability is improved, but the device complexity and driving circuit complexity increase significantly
Solution Approach 1:
The power conversion function is segmented into multiple parallel switch groups (first switch group and second switch group) rather than using a single long series chain. Each group handles a portion of the voltage conversion task, allowing independent control and reducing the complexity of the driving circuit while maintaining the overall voltage conversion capability.
Solution Approach 2:
Multiple switch groups are merged in parallel configuration to achieve the required voltage conversion ratio. This combining approach allows the system to attain high voltage conversion capability without requiring an excessive number of switches in series, thereby reducing driving circuit complexity.
2Power
If more power switches are used in series to improve voltage conversion ratio, then the voltage conversion efficiency is improved, but the switching losses and electromagnetic interference increase
Solution Approach 1:
The switching operation is segmented across multiple parallel switch groups with phase-shifted control. This segmentation allows each switch to operate at optimized timing, reducing overlapping switching transitions and minimizing switching losses while maintaining high voltage conversion efficiency.
Solution Approach 2:
Phase-shifted periodic switching control is applied to different switch groups, creating staggered switching intervals. This periodic action with phase shifts reduces simultaneous switching events, thereby decreasing switching losses and electromagnetic interference while preserving voltage conversion efficiency.
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 solution enables efficient voltage conversion with fewer power switches, simplifying the driving circuit, reducing costs, and enhancing efficiency and EMI performance.
Implementation Method 1
resonant operation, reducing switching losses and improving efficiency through reduced current ripple and EMI
Data Source
AI summary
A power converter can include a positive input terminal and a negative input terminal, configured to receive an input voltage; a positive output terminal and a negative output terminal, configured to generate an output voltage; a first power switch and a second power switch, sequentially coupled in series between the positive input terminal and a first node; a third power switch and a fourth power switch, sequentially coupled in series between a second node and the negative input terminal; a first energy storage element coupled between a common terminal of the first power switch and the second power switch and a common terminal of the third power switch and the fourth power switch; a first switched capacitor circuit coupled between the first node and the positive output terminal; and a second switched capacitor circuit coupled between the second node and the positive output terminal.