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A family of new non-isolated high step-up DC-DC converters has been devised and compared in terms of their characteristics (voltage gain, number of components, voltage stress on the diode and switch, etc). The high boost DC-DC converters depend mainly on charging and discharging of the inductors and capacitors to realize step-up function. One of the proposed converters is named the non-isolated high step-up (NHS) converter, which has been taken as an example to analyze. It is composed of a switch, two inductors, two capacitors, and three diodes. The voltage gain of NHS converter in continuous-conduction mode (CCM) and discontinuous-conduction mode (DCM) was analyzed, and the parameter of the components was designed. Theoretical analysis shows that NHS converter is characterized by high voltage gain, low switching stress, and low inductor current ripple. Besides, the voltage stress of the diodes on the NHS converter was analyzed. The theoretical analysis was verified by the simulation by Matlab/Simulink and construction of a working device. Furthermore, the closed loop system was established according to the corresponding small signal model. Step response was investigated by the system, when load and input source suddenly change.
Liu et al. (Wed,) studied this question.
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