Research On DC-DC Converter Based On Switched Capacitor Network

Solar power generation unit and energy storage unit are important components of the distributed generation system, This two units are connected with the DC bus through the DC-DC power converter. However, the traditional DC-DC power converters are difficult to realize high voltage transmission ratio, which performance is not good in the distributed generation system. In order to solve this problem two kinds of new switched-capacitor DC-DC converters are proposed in this paper, which based on the switched-capacitor network and traditional DC-DC converters, The one kind new converters have higher step-up ratio, the another one can realize bidirectional transformation and also have high ratio.By combining the switched-capacitor network with the traditional Boost converter, A new kind of step-up DC-DC converter with high ratio and a kind of low voltage stress with high ratio DC-DC converter are put forward in this paper, the two converters’ output voltage is four and three times of the traditional Boost converter. Based on the new switched capacitor network, a multi-input step-up DC-DC converter is put forward in this paper. By combining the switched-capacitor network with the Buck-Boost converter, a new bidirectional converter with high ratio is proposed, which the step-up ratio is two times of the traditional bidirectional converter and the step-down ratio is half of it. In order to reduce the switching loss, soft-switching technology is introduced into the switched-capacitor network. a new bidirectional DC-DC converter with resonant switched capacitor network is proposed in the end, which range of the step-up-down ratio is very wide.The working principles and characteristics of these new DC-DC converters are studied and analyzed in this paper, the simulation models of the proposed converters are established and the simulation analysis are carried out in the MATLAB/Simulink environment. Finally, the new proposed switched capacitor network DC-DC converters are implemented and analysis the experimental results. The experimental result ultimately shows the effectiveness of these proposed converters. Besides, these new converters can be applied in the distributed generation system as a power interface device for the solar power generation unit and energy storage unit connected to the DC bus.