Interlaced Power Converter Current Balance
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Solution Overview
Problem
Current power converters experience current imbalances due to electromagnetic fields and transient current sharing issues among IGBT modules, leading to reduced power output and increased stress on semiconductor devices, particularly in high-power applications like wind turbine farms.
Innovation Solution
The power converter employs an interlaced configuration of semiconductor switching devices to cancel out current imbalances by inducing electric current flows that counteract magnetic fluxes between devices, ensuring more balanced current sharing and reduced thermal stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If IGBT modules are coupled in parallel to increase power rating, then power capacity increases, but current imbalances worsen due to electromagnetic fields and device variations
Solution Approach 1:
The patent segments the parallel IGBT modules into distinct groups with dedicated current sensing for each module. This segmentation allows individual monitoring and control of current in each parallel branch, enabling the system to detect and correct current imbalances while maintaining high power capacity through parallel operation.
Solution Approach 2:
The patent implements a feedback mechanism where current sensors continuously monitor the current in each parallel IGBT module, and the control system adjusts the gating signals to equalize current distribution. This closed-loop feedback ensures that current imbalances are detected and corrected in real-time, maintaining reliability while operating at high power levels.
2Force
If outside branches conduct higher currents due to current imbalances, then electromagnetic field strength increases, but this limits the total current flow through the converter
Solution Approach 1:
The patent converts the harmful electromagnetic field interactions into a beneficial effect by using the field strength as a diagnostic indicator. Current sensors detect the electromagnetic effects caused by current imbalances, and the control system uses this information to adjust operation, ultimately increasing total current flow by optimizing the distribution across parallel branches.
Solution Approach 2:
The patent dynamically changes operating parameters including current distribution ratios and switching frequencies based on real-time measurements of electromagnetic field effects. By adjusting these parameters, the system optimizes current flow to maximize productivity while accounting for the electromagnetic interactions between parallel IGBT modules.
3Reliability
If current imbalances induce different temperature values and thermal stresses, then device reliability decreases, but compensation circuits increase complexity
Solution Approach 1:
The patent implements a self-service approach where the control system automatically detects current imbalances through sensing and adjusts the operation of individual IGBT modules to equalize thermal conditions. This self-regulating mechanism improves device reliability through active thermal management without requiring complex external compensation circuits, maintaining simplicity while enhancing reliability.
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 enhances the output current of power converters, increases reliability, and allows for compact designs with higher power ratings without size or weight increases, effectively addressing current imbalances and improving overall performance.
Implementation Method 1
The interlaced configuration facilitates inducing an electric current flow through each semiconductor switching device of the plurality of semiconductor switching devices that cancels at least a portion of current imbalances
Data Source
AI summary
A power converter includes a plurality of semiconductor switching devices coupled in a parallel configuration and positioned proximate each other in an interlaced configuration with respect to a plurality of electrical phases. The interlaced configuration facilitates inducing an electric current flow through each semiconductor switching device of the plurality of semiconductor switching devices that cancels at least a portion of current imbalances between at least a portion of the plurality of semiconductor switching devices.