Three-Phase Coupled Reactor Control for Low-Loss One-Phase Operation
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Solution Overview
Problem
Three-phase magnetic coupling reactors in power conversion devices face challenges in reducing switching losses during one-phase operations, as existing control methods do not effectively manage magnetic flux and inductance to minimize losses.
Innovation Solution
A control device for a three-phase magnetic coupling reactor that includes a first outer coil, a second outer coil, and an inner coil, with a core structure that allows for opposite magnetic flux directions and varying gap lengths to optimize inductance and reduce losses, enabling switching between one-phase, two-phase, and three-phase operations, and specifically selects the inner coil for one-phase operation to minimize losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the number of operating phases is reduced to reduce switching loss, then switching loss decreases, but magnetic flux management becomes more challenging
Solution Approach 1:
The patent introduces asymmetry in the magnetic circuit by setting different gap lengths for different outer core portions. The first and second outer core portions have a first gap length, while the third outer core portion has a second gap length that is longer. This asymmetric design creates different magnetic inductances for different phases, allowing the control device to select the optimal phase during one-phase operation to maintain magnetic flux balance and reduce losses.
Solution Approach 2:
The patent implements dynamic phase selection based on operating conditions. The control device dynamically determines which outer coil is not energized during one-phase operation and selects the corresponding phase for operation. This dynamic adaptation allows the system to optimize magnetic flux management and minimize losses according to the specific operating state, maintaining reliability while reducing switching losses.
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 effectively reduces ripple current and switching losses during one-phase operations by balancing inductance and managing magnetic flux, enhancing energy efficiency in power conversion devices.
Implementation Method 1
magnetic fluxes which pass through the first outer core portion, the second outer core portion, and the inner core portion are configured such that a direction of a direct-current magnetic flux derived from a coil wound around any core portion and generated in the core portion and a direction of a direct-current magnetic flux derived from another coil wound around another core portion and generated in the core portion are opposite to each other
Data Source
AI summary
An inner core portion includes an inner gap having a length in the first direction larger than that of the outer gap in a center in the first direction. A control device is configured to switch between a one-phase operation of causing a current to flow through any one of the first outer coil, the second outer coil, and the inner coil to operate, a two-phase operation of causing a current to flow through any two of the first outer coil, the second outer coil, and the inner coil to operate, and a three-phase operation of causing a current to flow through all of the first outer coil, the second outer coil, and the inner coil to operate. The control device selects the inner coil in the one-phase operation.