В настоящей статье представлена разработка светодиодного драйвера с функцией диммирования с топологией комбинации последовательного и параллельного резонансного преобразователя. В режиме диммирования переменная резонансная катушка индуктивности управляется ШИМ-сигналом на низкой частоте, обеспечивая при этом постоянный выходной ток СД. Для функции диммирования, в отличие от традиционных подходов, не используется изменение частоты переключения или обычный метод ШИМ. В предлагаемом в настоящей статье методе функция диммирования осуществляется за счёт нагрузки из 40 СД мощностью 1 Вт каждый, соединённых последовательно. Частота переключения цепи поддерживается постоянной на уровне 60 кГц. Согласно результатам экспериментов при управлении светильником можно достигать любого заданного уровня диммирования линейно в диапазоне от номинальной мощности до очень низких её значений без пульсаций светового потока, в отличие от обычной технологии ШИМ.
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• Предыдущая статья
• Следующая статья

• светодиодный драйвер
• LLC резонансный преобразователь
• диммирование
• резонансные контуры