Analysis and design of a near unity power factor single phase trapezoidal AC power supply
Bibliographic record
Abstract
Single phase AC power supplies used for powering optical fiber/coax cable are required to generate trapezoidal-shaped waveform. The proposed converter topology has the following main features: (a) a small DC bus capacitor resulting in a DC bus having a very large 120 Hz component; (b) an on-line instantaneous voltage controlled feedforward PWM pattern generator, based on reset integral control technique, in which the PWM modulating function is synchronized with the DC bus ripple; the trapezoidal output voltage fits within the envelope of the ripple, leading to maximum voltage utilization; and (c) the input current flows during the complete period which yields low overall distortion and high power factor. A power circuit realization of the proposed power supply and control scheme based on the one-cycle reset integral PWM pattern generator, required to produce a trapezoidal output voltage is shown. The one-cycle reset integral control technique produced the best overall results in terms of power factor (PF), total harmonic distortion (THD) and efficiency (/spl eta/). This paper presents detailed analysis and design curves that are required to implement the proposed power supply. The analytical expression for the RMS value of the current through the capacitor and input AC line are derived. A design procedure to select and rate components of the power and control circuit is illustrated by means of a design example. Finally, the theoretical and simulated results presented are experimentally verified.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
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".