Direct Converter Inductance Continuous Current Flow
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Solution Overview
Problem
Existing direct converters, such as those described in U.S. Pat. No. 6,900,998, face limitations in achieving continuous current flow and efficient energy exchange between branches, leading to large space requirements and high costs due to the need for substantial capacitance dimensioning to handle large energy transfers.
Innovation Solution
The direct converter incorporates n input phase connections and p output phase connections with (n·p) two-pole switching cells, each connected in series with inductance, enabling continuous current flow and efficient energy exchange between branches, allowing for active current setting and reduced capacitance requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the capacitances of the switching cells are dimensioned to transfer large amounts of electrical energy, then the energy transfer capability is improved, but the space requirement and cost increase significantly
Solution Approach 1:
The patent introduces an intermediate DC voltage link as a mediator between the AC input and AC output. This intermediate circuit allows energy to be stored and transferred more efficiently, enabling large energy transfer capability while using smaller capacitances in the switching cells compared to direct converter topologies.
2Power
If the direct converter is designed to transfer large amounts of electrical energy, then the power capability is improved, but the capacitance dimensioning requirements lead to increased space and cost
Solution Approach 1:
The patent segments the power conversion function into multiple stages: AC input rectification to DC intermediate voltage, and DC intermediate voltage to AC output inversion. This segmentation allows each stage to use optimized component values, reducing the capacitance size requirements while maintaining high power capability.
3Device complexity
If no inductance is connected in each series connection, then the device complexity is reduced, but continuous current flow and active current setting cannot be achieved
Solution Approach 1:
The patent changes the electrical parameters of the circuit by introducing inductances in the series connections between AC phases. These inductances enable continuous current flow and active current setting, improving the converter's control capability and performance without significantly increasing overall device complexity.
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 allows for flexible and efficient energy transfer, reducing the need for large capacitances and resulting in a more compact and cost-effective system capable of handling large energy transfers.
Implementation Method 1
At least one inductance is connected into each series connection of a corresponding one of the n input phase connections and a corresponding one of the p output phase connections
Data Source
AI summary
A direct converter includes n input phase connections and p output phase connections, where n≧2 and p≧2. The direct converter also includes (n·p) two-pole switching cells for switching at least one positive voltage and at least one negative voltage between the poles. Each output phase connection is connected in series with each input phase connection, respectively, via a switching cell. To enable any desired and continuous current flow setting from an input phase connection to an output phase connection of the direct converter and, moreover, to exchange electrical energy between the two-pole switching cells of the direct converter, at least one inductance is connected into each series connection. A system including a direct converter is also provided.