Multilevel Voltage Conversion for Stable DC-DC Equalization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Modern power converters face challenges in increasing output power to meet the demands of high-power application scenarios, and existing methods for voltage or current equalization often require adjusting frequencies, phase shift angles, or duty cycles, which can lead to instability and EMI interference.
Innovation Solution
A voltage conversion circuit comprising an N-level conversion unit and N−1 DC-DC conversion units, where the input terminals of the DC-DC conversion units are connected to the output terminals of the N-level conversion unit, allowing for direct adjustment of output levels to achieve voltage or current equalization without altering frequencies, phase shift angles, or duty cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional methods adjust frequencies, phase shift angles, or duty cycles to achieve voltage or current equalization, then equalization can be achieved, but circuit stability deteriorates and EMI interference increases
Solution Approach 1:
The patent changes the control parameter from sensitive timing parameters (frequency, phase shift angle, duty cycle) to a more stable output level parameter. By controlling the output levels of the N-level conversion unit, the system achieves voltage or current equalization without adjusting frequencies or phase shifts, thereby maintaining circuit stability while achieving precise equalization.
2Manufacturing precision
If traditional methods adjust frequencies, phase shift angles, or duty cycles to achieve voltage or current equalization, then equalization can be achieved, but EMI interference increases
Solution Approach 1:
The patent changes the control parameter from sensitive timing parameters (frequency, phase shift angle, duty cycle) to a more stable output level parameter. By controlling the output levels of the N-level conversion unit, the system achieves voltage or current equalization without adjusting frequencies or phase shifts, thereby reducing EMI interference while achieving precise equalization.
3Power
If multiple DC-DC conversion units are used to increase output power, then high-power output is achieved, but voltage equalization control complexity increases
Solution Approach 1:
The patent changes the control approach from adjusting multiple timing parameters (frequency, phase shift, duty cycle) to controlling output levels of the N-level conversion unit. This simplifies the control strategy for multiple DC-DC conversion units, making voltage equalization easier to implement while maintaining high output power capability.
Solution Approach 2:
The patent divides the power conversion system into an N-level conversion unit and multiple DC-DC conversion units. Each DC-DC unit connects to adjacent output terminals of the N-level unit, creating a modular structure that facilitates power scaling while simplifying control through standardized connections and a unified control strategy.
Data Source
AI summary
A voltage conversion circuit includes an N-level conversion unit and N−1 DC-DC conversion units. The N-level conversion unit includes N output terminals at different levels. A first input terminal of an Mth DC-DC conversion unit is connected to an Mth output terminal of the N-level conversion unit, and a second input terminal of the Mth DC-DC conversion unit is connected to an (M+1)th output terminal of the N-level conversion unit. An output level of the Mth output terminal and an output level of the (M+1)th output terminal are adjacent levels. N and M are positive integers and satisfy N≥3 and 1≤M<N.