COTS circuit predicting coil zero-current crossing for early thyristor triggering in a fast, high-power magnetic generator
| Autor: | Isabelle Lagroye, Bernard Veyret, Ph. Dondon, R. Charlet de Sauvage |
|---|---|
| Přispěvatelé: | Taxile, Murielle, Laboratoire de l'intégration, du matériau au système (IMS), Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université Sciences et Technologies - Bordeaux 1, Laboratoire de Bioélectromagnétisme, École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École Nationale Supérieure de Chimie et de Physique de Bordeaux (ENSCPB) |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Engineering
0206 medical engineering [SDV.BBM.BP] Life Sciences [q-bio]/Biochemistry Molecular Biology/Biophysics 02 engineering and technology Permanent magnet synchronous generator law.invention Integrated gate-commutated thyristor 03 medical and health sciences Op amp integrator 0302 clinical medicine law Electronic engineering Electrical and Electronic Engineering business.industry Electrical engineering Thyristor 020601 biomedical engineering [SDV.BBM.BP]Life Sciences [q-bio]/Biochemistry Molecular Biology/Biophysics [SDV.TOX] Life Sciences [q-bio]/Toxicology Capacitor Electromagnetic coil [SDV.TOX]Life Sciences [q-bio]/Toxicology RLC circuit business 030217 neurology & neurosurgery Voltage |
| Zdroj: | EPE Journal-European Power Electronics and Drives EPE Journal-European Power Electronics and Drives, Taylor & Francis, 2011, 21 (2), pp.11-17 |
| ISSN: | 0939-8368 2376-9319 |
| Popis: | BioEM ; BioELEC; International audience; This paper describes the design and construction of a zero-current crossing detection circuit for a high-power (6000 A, 650 V) magnetic generator delivering short (340 μs), high-intensity (2 Tesla) pulses, used to stimulate living tissues. The magnetic pulses are produced by discharging a capacitor Cd into a coil in resonant mode. Half-sine or full-sine waveforms may be selected. When full-sine current into the coil is selected, a smooth transition between the 2 half-sines is required to ensure continuity in tissue excitation, i.e. the second thyristor must be triggered shortly before the first one switches off. The operating theory is to compute the period of the resonant circuit in advance, irrespective of interchangeable coil inductance and damping factors. The system core consists of a toroid sensor encircling the high-current main wire of the coil and an integrator circuit that is switched on or off by three events: the starting time and zero-crossing time of the sensor voltage and the zero-crossing time of the potential across Cd. This makes it possible to detect the pulse period right from the end of the first quarter period. Details of the robust COTS (commercial off-the-shelf) electronic design are given. Electric tests fully validated this design. The final section discusses the results and possible improvements. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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