Design of Three Limb Coupled Inductor using Cross-Coupled Windings to Produce Multi-Level Output Voltages and Reduced Magnetics
Bibliographic record
Abstract
Coupled Inductor (CI) design for a 3-phase voltage source converter (VSC) with three parallel-connected 2-level inverter bridges in each phase is described. The CIs are desired to average the output of the parallel-connected inverter legs to produce 4-level phase and 7-level PWM line voltages with PWM voltage step smaller than the dc-link voltage. In addition, the frequency of the PWM line voltage is 6 times greater than the switching frequency. The system is useful for lowing filter size, weight and cost in mobile applications such as aerospace and electric vehicles where light-weight magnetic filters are desirable. The system is also useful to reduce cable interaction and common mode to ground noise in motor drives and uninterrupted power supplies. The CI design procedure is compared with the design of inductors used for current ripple cancellation. The weight of the CIs is shown to be 1/6thsmaller in comparison. Sample magnetic design of a 3-limb CI with metglas cores are presented for a 5.5 kW (300Vdc, 208V/15A) laboratory prototype operating with 60 Hz and 1.1 kHz fundamental voltages.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.002 |
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".