Open-End Winding Power Converter for Inverter Loss Balancing
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Solution Overview
Problem
In open-end winding systems, switching between inverter circuits leads to inefficiencies due to loss concentration in one inverter circuit, causing heat generation and temperature imbalances among switching elements.
Innovation Solution
A power converter with a controller that switches between first and second power conversion controls based on the effective drive current value, distributing losses by locking switching elements in closed states and switching others, thereby preventing heat concentration when the current exceeds a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If switching is performed between first inverter circuit and second inverter circuit, then losses are distributed and temperature increase is suppressed, but control deviations occur and efficiency decreases
Solution Approach 1:
The patent applies dynamics by making the switching element states adaptive rather than fixed. The controller dynamically adjusts which switching elements are switched and which are locked based on real-time current magnitude detection. When current is small, switching elements are actively switched; when current exceeds threshold, they are locked in closed state. This dynamic adaptation resolves the contradiction by optimizing the control strategy according to operating conditions.
Solution Approach 2:
The patent changes the operational parameters of the inverter circuits based on current magnitude. The threshold current value serves as a parameter boundary that triggers different control modes. By changing the state parameter (switched vs. locked) of switching elements based on current parameter, the system achieves efficient loss distribution without excessive control deviations.
2Temperature
If switching elements are locked in closed state and others are switched, then heat concentration is prevented, but device complexity increases
Solution Approach 1:
The patent segments the inverter circuit into multiple independent switching element groups (first inverter circuit and second inverter circuit). Each group can be independently controlled - some switching elements are locked while others are switched. This segmentation allows heat distribution across different segments and simplifies the control logic for each segment, resolving the contradiction between temperature management and control complexity.
Data Source
AI summary
In a power converter for converting DC power from a DC power source into AC power and supplying the AC power to a single-phase winding or multi-phase windings, a controller controls first and second inverter circuits and performs first power conversion control to lock open/closed states of switching elements in the second inverter circuit and switch open/closed states of switching elements in the first inverter circuit, and second power conversion control to lock open/closed states of the switching elements in the first inverter circuit and switch open/closed states of the switching elements in the second inverter circuit. The controller is configured to perform either the first power conversion control or the second power conversion control when an effective value of drive current through each winding is less than a threshold, and otherwise switch between the first power conversion control and the second power conversion control.