Modular DC-DC Converter Stages for High-Ratio Low-Stress Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional DC-DC converters face inefficiencies due to systemic energy loss and increased complexity as the transformation ratio increases, requiring a large number of capacitors and switches, which can lead to high switch stress and output resistance.
Innovation Solution
The modular architecture of DC-DC converters allows for the mixing and matching of switching networks and regulating circuits, utilizing adiabatic charging and diabatic discharging principles to minimize energy loss, with specific topologies like series-parallel and cascade multipliers, and incorporating magnetic storage elements to control RMS currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the transformation ratio increases in conventional DC-DC converters, then the voltage conversion capability improves, but the number of capacitors and switches increases leading to higher device complexity
Solution Approach 1:
The converter is divided into multiple modular stages, each with a switching network and regulating circuit. This segmentation allows the overall transformation ratio to be achieved through cascaded stages rather than requiring a single complex stage, thereby reducing the number of components needed in each individual stage while maintaining the total voltage conversion capability.
2Power
If the transformation ratio increases in conventional DC-DC converters, then the voltage conversion capability improves, but the switch stress increases
Solution Approach 1:
By dividing the voltage conversion into multiple stages, the voltage stress on individual switches is reduced. Each switching network operates at a lower voltage level compared to a single-stage converter achieving the same total transformation ratio, thereby reducing switch stress and improving reliability.
Solution Approach 2:
The regulating circuits dynamically adjust the operation of switching networks to optimize switch stress distribution. The modular architecture allows flexible configuration where switches operate under more favorable electrical conditions, reducing peak stress levels.
3Power
If the transformation ratio increases in conventional DC-DC converters, then the voltage conversion capability improves, but the output resistance increases
Solution Approach 1:
The multi-stage modular architecture reduces output resistance by distributing the voltage transformation across multiple stages. Each stage contributes to the overall conversion while maintaining lower impedance levels, resulting in reduced total output resistance compared to a single-stage converter with the same transformation ratio.
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 approach reduces systemic energy loss, allows for flexible configuration, and achieves lower output resistance and switch stress, enabling efficient power conversion with smaller capacitors and reduced switching frequency, while maintaining high efficiency.
Implementation Method 1
utilizing adiabatic charging and diabatic discharging principles to minimize energy loss
Implementation Method 2
a first capacitor of the first group is charged by a second capacitor of the second group
Implementation Method 3
incorporating magnetic storage elements to control RMS currents
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An apparatus for electric power conversion comprises an AC switching network connected to a regulating circuit comprising an inductor. The regulating circuit maintains an average DC current through the inductance. The AC switching network comprises switches that, when connected to charge-storage elements, define a switched-capacitor network, wherein the switches are controllable to switch between switching configurations such that, when the switching network is connected to charge-storage elements, each switching configuration defines a different arrangement of charge-storage elements in the switched-capacitor network. The switched-capacitor network transitions between first and second arrangements of the charge-storage elements so as to cause a transformation between an AC voltage on a first port of the switching network and a voltage with a non-zero average voltage on a second port of the switching network.