dc.contributor.author | Tyshko, Alexey A | |
dc.contributor.author | Balevičius, Saulius | |
dc.contributor.author | Padmanaban, Sanjeevikumar | |
dc.date.accessioned | 2023-09-18T16:46:46Z | |
dc.date.available | 2023-09-18T16:46:46Z | |
dc.date.issued | 2016 | |
dc.identifier.issn | 2169-3536 | |
dc.identifier.other | (BIS)LBT02-000057136 | |
dc.identifier.uri | https://etalpykla.vilniustech.lt/handle/123456789/116562 | |
dc.description.abstract | Described in this paper is a method for improving higher harmonic cancellation in nuclear magnetic resonance transmitters, which are used in oil and gas well logging tools operating at 175 °C. Multi-module multi-level topology which combines the outputs of several identical power modules operating at 50% duty cycle at the fundamental frequency provides the versatility needed for both low harmonic sine voltage synthesis and amplitude control. Cancellation of the output voltage higher harmonics is achieved by creating fixed relative phase shifts between the individual modules of the multi-module converter. The amplitude control employs the Chireix–Doherty outphasing modulation principle with added feed forward correction circuitry. The possibilities of a 20% increase of the tool signal-to-noise ratio, as compared with that of a two-module transmitter has also demonstrated significant increase in the tool life expectancy. | eng |
dc.format | PDF | |
dc.format.extent | p. 7912-7920 | |
dc.format.medium | tekstas / txt | |
dc.language.iso | eng | |
dc.relation.isreferencedby | Science Citation Index Expanded (Web of Science) | |
dc.source.uri | http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7737038 | |
dc.subject | MC02 - Elektros ir elektroniniai įrenginiai bei sistemos / Electrical and electronic devices and systems | |
dc.title | An increase of a down-hole nuclear magnetic resonance tool's reliability and accuracy by the cancellation of a multi-module DC/AC converter's output's higher harmonics | |
dc.type | Straipsnis Web of Science DB / Article in Web of Science DB | |
dcterms.references | 35 | |
dc.type.pubtype | S1 - Straipsnis Web of Science DB / Web of Science DB article | |
dc.contributor.institution | Vilniaus Gedimino technikos universitetas NATA Consulting LLC | |
dc.contributor.institution | Valstybinis mokslinių tyrimų institutas Fizinių ir technologijos mokslų centras Vilniaus Gedimino technikos universitetas | |
dc.contributor.institution | University of Johannesburg | |
dc.contributor.faculty | Elektronikos fakultetas / Faculty of Electronics | |
dc.subject.researchfield | T 001 - Elektros ir elektronikos inžinerija / Electrical and electronic engineering | |
dc.subject.researchfield | N 002 - Fizika / Physics | |
dc.subject.ltspecializations | L102 - Energetika ir tvari aplinka / Energy and a sustainable environment | |
dc.subject.en | SNR improvement | |
dc.subject.en | Accuracy | |
dc.subject.en | Chireix-Doherty outphasing | |
dc.subject.en | Harmonic cancellation | |
dc.subject.en | Nuclear magnetic resonance (NMR) | |
dc.subject.en | Life expectancy | |
dc.subject.en | MOSFET conduction losses | |
dc.subject.en | Multi-module converter | |
dcterms.sourcetitle | IEEE Access | |
dc.description.volume | Vol. 4 | |
dc.publisher.name | IEEE | |
dc.publisher.city | Piscataway | |
dc.identifier.doi | 10.1109/ACCESS.2016.2624498 | |
dc.identifier.elaba | 19690816 | |