Haifang Wen, C. Lam, Wai-Hei Choi, Chikong Wong, M. Wong
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A 97.0% maximum efficiency, fast response, low voltage ripple KY boost converter for photovoltaic application
This project designed and implemented a high-performance DC-DC KY boost converter for photovoltaic application. Targeting at the growing solar energy market, the proposed PV generation system is used to directly transfer the power from PV panel to AC power grid. The system adopted a topology of DC-DC converter called KY converter to step up DC voltage to a suitable level. Its characteristics include high efficiency, fast transient response, and small output voltage ripple, in comparison with the traditional DC-DC boost topologies. With feedback control circuits with digital signal processor (DSP), system can adjust the output level immediately. After the correctness of the system, the design was verified by simulation for both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) of KY boost converter; experiments for CCM was conducted, which showed a peak efficiency of 97.0% in 1.2kW load condition, with 0.5% low voltage ripple and transient response time within 25ms.
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