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Rezultaty
The goal of this project was to develop a Module Integrated Converter (MIC) with extended lifetime (at least 15 years) and low production costs. One crucial factor for miniaturisation is the integration of many functions into a single chip, usually an Application Specific Integrated Circuit (ASIC). The second factor is the increase of the switching frequency in order to reduce the size of passive components.
The consortium is composed of the research centres ISET (Germany), ECN (The Netherlands), IMEC (Belgium) and NMRC (Ireland) as well as the company Soltech seated in Leuven, Belgium.
ECN developed and simulated the control algorithm for the grid detection and the MPP-Tracking, while IMEC created the ASIC according to the specifications from ECN. Now all necessary software modules for further simulations are available at ECN.
The ASIC is fully functional and tested. An interested industrial partner can use this device in a future product development as is. ISET developed a robust DC-AC inverter of 100W AC output power with standard magnetic components. The interested reader can find some useful hints for developing a DC-AC inverter. Some unexpected problems appeared during the project development so that at the current stage some more inquiry needs to be done on passive components in order to develop an industrial product.
NMRC developed flat integrated magnetic components for the use in the inverter developed at ISET. This includes the transformer as well as the filter chokes. The current sensor is integrated into the transformer, which is a very interesting feature. NMRC also built up a considerable knowledge in packaging issues, thermal properties of the inverter and reliability estimation.
The presented Low Profile Design of a Module Integrated Converter (MIC) for Photovoltaic applications has double the power density compared to commercially available MIC. Encapsulation materials have positive impact on the thermal behaviour of the MIC as well as the whole concept of the exterior packaging. The internal temperature of aluminium electrolytic capacitors is the main factor, which influences their lifetime and the lifetime of the whole MIC. The design of a MIC was optimised according to reliability issues. This was achieved by a detailed 3D thermal simulation of the MIC and the solar module.
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