Short-Circuit Fault Diagnosis and Post-Fault Control with Adaptive PLL-Based Synchronization for a Multi-Phase Quasi-Square-Wave DC-DC Converter
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Bibliographic record
Abstract
Fault-tolerant power management units have regained attention due to the rapid development of autonomous vehicles. This paper presents: 1) a fast short-circuit fault diagnosis method, which prevents turning on into a short-circuit, and 2) an adaptive post-fault control for a multi-phase variable-frequency Quasi-Square-Wave (QSW) synchronous buck converter with more than two phases. The converter employs GaN device as the primary switch due to its better figure-of-merit, while using Si device as protection switch due to superior short-circuit immunity. In this paper, the QSW operation mode and a multi-phase structure are combined to achieve enhanced efficiency and fault tolerance. The switching-node voltage during the dead-time intervals is used as the short-circuit fault signature. The adaptive post-fault control utilizes a PLL-based synchronization method in a closed daisy-chain arrangement to: 1) guarantee QSW operation mode regardless of the variable switching frequency due to the inductance value tolerance, and 2) automatically adjust the interleaving phase shifts between phases following a fault detection. The effectiveness of the proposed methods is evaluated and verified in a 75-W four-phase system.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it