Article

UNIVERSAL BIDIRECTIONAL DC-AC CONVERTER

Authors:
  • Priazovskyi State Technical University
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Abstract

Представлено схемное решение и описание работы двунаправленного DC-AC преоб-разователя с трансформаторной изоляцией. В основе схемы лежат принципы, применяе-мые в резонансных LLC преобразователях и двойных активных мостах (DAB, Dual ActiveBridge), но в предлагаемой конструкции используется биполярное построение инвертора состороны переменного напряжения, а также совмещенное частотное и широтно-импульсное управление. Это дает возможность реализовать ряд функций в одном преоб-разователе, используя небольшое число коммутаций в силовой цепи. Так, возможна работав режиме источника бесперебойного питания (преобразование постоянного напряженияАКБ в переменное 220 В 50 Гц); инвертора связи с сетью альтернативных источников(солнечных панелей); зарядного устройства (работающего как от сети, так и от солнеч-ных панелей); сварочного инвертора для полуавтоматической сварки (причем сварку мож-но осуществлять как от сети, так и от АКБ); стабилизатора переменного напряжения;преобразователя постоянного напряжения (для «прикуривания» АКБ с разными напряже-ниями или степенью заряженности). Устройство с перечисленным набором функций мо-жет найти применение, например, в полевых условиях – для организации электропитанияразличных нагрузок, зарядки аккумуляторов, а также проведения мелких сварочных работ. Схемное решение преобразователя позволяет при применении соответствующих алгорит-мов управления работать с близким к единице коэффициентом мощности на стороне пе-ременного напряжения. Это дает возможность обеспечить работу в «слабой» сети – отавтономного генератора, при большой длине сетевого шнура и т.д.

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