Scientific paper ID 1895 : 2019/3 MATHEMATICAL MODEL OF ELECTROMAGNETIC PROCESSES IN DC PULSE CIRCUITSPetar Ivanov Pulse voltage circuits convert the voltage to a large extent, which is sometimes referred to as ”DC voltage transformers”. Their more common definition is DC / DC converters. The main elements in pulse voltage circuits are the electronic switches, which are realized with modern semiconductor elements - MOS transistors (induced channel NMOS or PMOS transistors), IGBT transistors and others. The key in the circuits is commanded by a control system which, by changing the ratio between the open and closed key times, provides stability of the output voltage. In the present work a mathematical deion of the processes in the impulse circuits is made by analyzing the relation between them. For this purpose, the scheme is conventionally considered as being composed of two parts (sub-schemes). One contains the load and the other contains the key element. This study allows to analyze the reflection of the electromagnetic processes occurring in the second sub-scheme on the processes in the first and vice versa. Analytical dependencies are obtained in the work, which can evaluate the processes in the impulse circuits. The resulting analytical dependencies are applied to a circuit diagram of a boost (”Bus”) DC voltage converter. The results obtained in the Mathcad environment were compared with those obtained from the simulation of the Orcad PSpice scheme. Coincidence of graphical dependencies was established. преобразуватели на постоянно напрежение; математичен модел; Буст преобразувател.DC voltage converters; mathematical model; Boost Converter.Petar IvanovBIBLIOGRAPHY[1] Cherneva G., P. Ivanov. Podhodi za modelirane na elektronni shemi s klyuchovi elementi. Nauchna konferentsiya KEIT 2018, Spisanie ”Mehanika, transport, ISSN 1312-3823, tom 16,br.3/2, str VII-60- VII-66 ( [1] Чернева Г., П. Иванов. Подходи за моделиране на електронни схеми с ключови елементи. Научна конференция КЕИТ 2018, Списание ”Механика, транспорт, ISSN 1312-3823, том 16,бр.3/2, стр VII-60- VII-66 )[2] Cherneva G. Simulatsiya i izsledvane na haotichna sinhronizatsiya pri nelineyno podvklyuchvane. Sp. Mehanika, transport, komunikatsii, ISSN 1312-3823, br.2 2015, str. HІ-6- HІ-11 ( [2] Чернева Г. Симулация и изследване на хаотична синхронизация при нелинейно подвключване. Сп. Механика, транспорт, комуникации, ISSN 1312-3823, бр.2 2015, стр. ХІ-6- ХІ-11 )[3] Cherneva G. Izsledvane na ustoychivost na protsesite v sistema za fazova avtomatichna donastroyka na chestotata. XXI Mezhdunarodna nauchna konferentsiya Transport 2013, sp. „Mehanika, transport, komunikatsii”, ISSN 1312-3823, br.11/3, ch.2.2013, str.HІ-15 - HІ-21. http://www.mtc-aj.com/library/864.pdf ( [3] Чернева Г. Изследване на устойчивост на процесите в система за фазова автоматична донастройка на честотата. XXI Международна научна конференция Транспорт 2013, сп. „Механика, транспорт, комуникации”, ISSN 1312-3823, бр.11/3, ч.2.2013, стр.ХІ-15 - ХІ-21. http://www.mtc-aj.com/library/864.pdf )[4] Ignatov M., At. Manoilov, V. Lyaskov. Tokozahranvashti ustroystva, Tehnika, S., 2003. 258 str. ( [4] Игнатов М., Ат. Маноилов, В. Лясков. Токозахранващи устройства, Техника, С., 2003. 258 стр. )[5. Kutsarov St. DC/DC Preobrazuvateli. Sp. Inzhenering revyu, br.1,br. 2/2006. ( [5. Куцаров Ст. DC/DC Преобразуватели. Сп. Инженеринг ревю, бр.1,бр. 2/2006. )[6] Ivanov P. Modelirane i simulatsiya na rabotnite protsesi v povishavasht preobrazuvatel na postoyanno naprezhenie. Natsionalen mladezhki forum „Nauka, tehnologii, inovatsii, biznes”, 2019. ( [6] Иванов П. Mоделиране и симулация на работните процеси в повишаващ преобразувател на постоянно напрежение. Национален младежки форум „Наука, технологии, иновации, бизнес”, 2019. )

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