Topological Semiconductor Switch Timing for Precise Current Switchover
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Solution Overview
Problem
Existing methods for driving topological semiconductor switches in power electronics systems face challenges in achieving precise current switchover times, leading to inefficiencies and potential semiconductor overload due to current errors and power loss distribution imbalances.
Innovation Solution
A method for driving a topological semiconductor switch by temporally separating two groups of power semiconductors at a preset switching frequency, using pointwise interpolation and extrapolation of the discretized phase current to predict the next switching point with minimal current deviation, and optionally adjusting the switching frequency for precise timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional driving methods are used for topological semiconductor switches, then the switching operation is simple, but the precision of current switchover times is insufficient leading to current errors and power loss distribution imbalances
Solution Approach 1:
The method performs preliminary actions by predicting future switching points before they occur. It calculates anticipated switching times based on current trends and power loss considerations, then prepares the semiconductor switches in advance for these predicted switching events. This allows the system to proactively optimize switching timing rather than reactively adjusting to current errors.
Solution Approach 2:
The method implements feedback by continuously monitoring actual current values and comparing them with predicted current values at switching points. It calculates current errors and uses this feedback information to adjust future switching point predictions, creating a closed-loop control system that progressively improves switching precision and reduces power loss distribution imbalances.
2Measurement precision
If switching frequency is increased to improve current switchover precision, then the precision of current switchover times improves, but the power loss and semiconductor stress increase
Solution Approach 1:
The method dynamically changes the switching frequency parameter based on operating conditions and predicted power loss. Instead of using a fixed high switching frequency, it adjusts the frequency locally around specific switching events, increasing it only when and where precision is critical for minimizing power loss, and maintaining lower frequencies elsewhere to reduce overall energy consumption and semiconductor stress.
3Power
If multiple power semiconductors operate in parallel, then the current capacity increases, but the power loss distribution becomes unbalanced causing semiconductor overload
Solution Approach 1:
The method applies local quality by optimizing the operating conditions and switching timing for each individual semiconductor device within the parallel configuration. It calculates device-specific switching points that account for individual characteristics and current sharing, ensuring that each semiconductor operates in its optimal region. This localized optimization balances the power loss distribution across all devices while maintaining high total current capacity.
Data Source
AI summary
A method for driving a topological semiconductor switch for a power electronics system, wherein the topological semiconductor switch is split into at least two groups of power semiconductors that are driven temporally separately from one another at a preset switching frequency in such a way that in each case only one of the power semiconductors takes on the total current, wherein the method includes determining of a next switching point, including conducting a pointwise interpolation of the discretized phase current in such a way that the change in the current between two conducting phases is measured and extrapolated, and then, together with the switching frequency, the current rise and the current error are predicted for the next two switching operations, and from this the next switching point with the smallest absolute current deviation is determined.