Variable-Phase Power Conversion for Balanced Coupled Reactors
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Solution Overview
Problem
Fuel cell electric vehicles face inefficiencies in power conversion due to limitations in the number of phases in magnetically coupled reactors, leading to imbalanced current distribution and reduced power conversion efficiency across a wide output range.
Innovation Solution
A power conversion device with a controller that dynamically adjusts the number of driving phases among conversion sets, ensuring even current distribution by selectively driving phases based on system requirements, avoiding mixed magnetic coupling states that cause inefficiencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of phases in magnetically coupled reactors is increased to expand the required output range, then the power conversion efficiency peak shifts to high current range, but the efficiency decreases in other current ranges
Solution Approach 1:
The patent applies dynamics by making the number of operating phases variable rather than fixed. The control unit dynamically adjusts the number of phases based on the required output, allowing the system to adapt to different operating conditions. This resolves the contradiction by enabling the system to maintain high efficiency across a wide output range through dynamic phase adjustment.
Solution Approach 2:
The patent changes the operational parameter (number of phases) to optimize performance. By varying the number of phases from 1 to 6 based on output requirements, the system can maintain peak efficiency at different current ranges, thus resolving the efficiency peak shift problem.
2Ease of operation
If the conversion module is driven by a number of phases that is not a multiple of the magnetically coupled phases, then the current distribution becomes unbalanced, but the power conversion efficiency cannot be optimized
Solution Approach 1:
The control unit uses feedback to monitor the required output and determines the optimal number of phases to operate. By continuously adjusting the phase configuration based on output requirements, the system maintains balanced current distribution while preserving operational flexibility.
Solution Approach 2:
The system dynamically selects the number of operating phases based on real-time output requirements. This dynamic phase selection ensures that the number of operating phases is always a multiple of the magnetically coupled phases, maintaining current balance while allowing operational flexibility.
3Reliability
If interleave control is carried out to balance current distribution, then the input and output current ripple is enlarged, but the control stability deteriorates
Solution Approach 1:
The patent extracts the current balancing function from the control algorithm and implements it through hardware configuration (selective phase operation). By physically configuring which phases are active based on output requirements, the system achieves current balance without relying on interleave control, thus avoiding current ripple enlargement and maintaining control stability.
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 achieves high power conversion efficiency across a wide current range by ensuring even current distribution and preventing imbalances, thereby enhancing the stability and efficiency of the power conversion process.
Implementation Method 1
the coils of the conversion parts are capable of magnetic coupling to each other
Data Source
AI summary
To provide a power conversion device configured to evenly pass current through phases and to achieve high power conversion efficiency in a wide current range. A power conversion device comprising conversion parts which are coupled in parallel to each other, which are capable of voltage conversion, and each of which includes a coil, wherein the power conversion device comprises M (M is a natural number of 2 or more) sets of conversion sets including the conversion parts of N phases (N is a natural number of 2 or more), and the coils of the conversion parts are capable of magnetic coupling to each other; wherein the power conversion device includes a controller configured to change a driving phase number X of the conversion parts according to a system requirement.