Research On New Double-input DC/DC Flyback Converter

Nowadays, the energy crisis which is caused by using traditional energy is getting more and more serious. We humanbeings must get over it to our survor. We humanbeings must exploitate and applicate the new energy because of the energy crisis. The hybrid renewable power system which contains the multiple-input DC/DC converter as it main circuit is proposed. In such systems, the use of a multiple-input DC/DC converter (MIC) leads to simpler circuit and lower cost, compared to the conventional use of several single-input converters. This paper focuses on the topologies and control strategies of MICs. The multiple-input dc/dc converter (MIC) is an important research content of the hybrid renewable power system.In this paper, after analyzing the traditional multiple-input Flyback converter, a new multiple-input Flyback converter are proposed by using the Buck type PVSCs (Pulsating Voltage Source Cells) which are connected in series to replace the input source of the single-input Flyback converter. The proposed converter has the advantages as follow: the circuit is simple, the voltage stress of the switches is low, the input portion is isolated with the input portion and sources can deliver power to the load individually or simultaneously. The operating principle, control method, steady-state relationship between the input and output in different control method are presented in the paper. We used this circuit as the main circuit to compose a solar cell & commercial power hybrid renewable power system after analyzing the characteristics of the solar cell. We also give the control strategy with which the aim that using the solar energy as much as possible can come ture.At last, in accordance with analyzes, the parameter design of the new double-input Flyback converter is discussed. A 120W prototype is fabricated. The simulation and experimental waveforms are given to verify the theoretical analysis and effectiveness of the control strategy.