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Сравнение устройств управления светодиодами на основе преобразователей постоянного тока SEPIC, Чука и обратноходовых. Журнал «Светотехника» №6 (2019).

Журнал «Светотехника» №6

Дата публикации 20/12/2019
Страница 37-44

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Сравнение устройств управления светодиодами на основе преобразователей постоянного тока SEPIC, Чука и обратноходовых. Журнал «Светотехника» №6 (2019).
Авторы статьи:
Эрдал Шехирли (Erdal Sehirli)

Эрдал Шехирли, Erdal Sehirli, M. Sc. (2009 г.). Аспирант (Ph.D.) Университета Коджаэли и преподаватель факультета электронной техники профессиональнотехнического училища Университета Кастамону. Область научных интересов: устройства управления для светодиодов, электрические машины и приводы, выпрямители напряжения и нелинейные системы управления

Аннотация
Проведено сравнение схем устройств управления для светодиодов (СД), включающих в себя преобразователи постоянного тока с несимметрично нагруженной первичной индуктивностью (SEPIC), преобразователи Чука и обратноходовые преобразователи. Все схемы рассчитаны на мощность 8 Вт и работают в режиме прерывистых токов (DCM) с частотой переключения 88 кГц. Кроме того, намотка индуктивностей преобразователей SEPIC и Чука делает их индуктивно-связанными. Эти преобразователи реализуются с использованием микросхемы SG3524 в схемах без обратной связи и микроконтроллера PIC16F877 в схемах с обратной связью. Кроме того, для ограничения максимального тока СД в схемах с обратной связью используется датчик тока ACS712. Устройства управления для СД на основе преобразователей SEPIC, Чука и обратноходовых сравниваются по току СД, напряжению на СД, входному напряжению и входному току. Приведены преимущества и недостатки всех схем.
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