access icon free Micro-inverter based on single-ended primary-inductance converter topology with an active clamp power decoupling

© The Institution of Engineering and Technology
Received 08/12/2016, Accepted 16/08/2017, Revised 23/06/2017, Published 21/08/2017

The reliability and lifespan of micro-inverters are two significant features of AC-module photovoltaic systems. One of the most effective methods to enhance the reliability and life duration of micro-inverters is achieved by substituting their electrolytic power decoupling capacitor with the film capacitors. In this study, a new DC/AC inverter based on an isolated single-ended primary-inductance converter with an active clamp power decoupling is introduced. The proposed converter has no electrolytic capacitor which results in long lifetime and high reliability. Moreover, the inverter has simple structure and low number of semiconductor switches which improve the efficiency and make it cost effective. The sufficient stepping up ability for output voltage without increasing turns ratio excessively, non-pulsating input current, and appropriate isolation make the proposed micro-inverter a proper choice for grid-connected applications. The converter operating modes are discussed and design considerations are presented. Finally, experimental results of the implemented prototype validate aforementioned features and performance of the proposed micro-inverter.

Inspec keywords: power grids; invertors; DC-AC power convertors; power semiconductor switches

Other keywords: microinverter life duration; microinverter lifespan; isolated single-ended primary-inductance converter; microinverter reliability; film capacitors; grid-connected applications; semiconductor switches; active clamp power decoupling; AC-module photovoltaic systems; electrolytic power decoupling capacitor; DC-AC inverter; single-ended primary-inductance converter topology

Subjects: Relays and switches; Reliability; Power electronics, supply and supervisory circuits; Power semiconductor devices

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