Z-source high-gain low-switching-stress direct current boost converter

Abstract

The invention relates to a Z-source high-gain low-switching-stress direct current boost converter. On the basis of a traditional boost direct-current converter topological structure, a novel circuit topological structure is achieved by adopting a mode that an X-type Z-source network, a simple inductor and a simple capacitor are connected in series and parallel. The Z-source high-gain low-switching-stress direct current boost converter can obtain high voltage conversion gain and further reduce voltage stresses exerted onto two ends of a master switch, and a development target of enabling the direct current boost converter to be efficient, small in size and low in noise and cost is effectively achieved. Under the condition of low duty ratio, high gain is achieved. Due to the fact that the breakover time of the master switch is shortened, a peak value of input current is effectively reduced, and breakover consumption is reduced. The voltage stress of a switch tube is reduced from (i)Vo( / i) to (i)Vo( / i) / 3, 2(i)Vo( / i) / 3, and the hardware manufacturing cost is reduced. A transformer, a coupling inductor and a multistage connecting mode are not needed, and a circuit topological structure is simple. The target of enabling the direct current boost converter to be efficient, small in size and low in noise and cost can be achieved.

Description

technical field [0001] The invention relates to a DC boost converter, in particular to a Z-source high-gain DC boost converter with low switch stress. Background technique [0002] In recent years, the research on the development and utilization of new energy has become more and more extensive and in-depth at home and abroad, especially the research on photovoltaic power generation systems. my country's photovoltaic industry is developing rapidly, and its market share ranks among the top in the world. However, the output voltage of a single photovoltaic panel is low, and it is difficult to meet the requirements of the DC bus voltage of the subsequent inverter. Requirements see 1. Li Xuebin, Zhao Caihong, Huang Xiaohua, Application of cascaded converters in superconducting energy storage systems [J]. Power Grid Technology, 2006, 30(16): 54-58; 2. Fang Yu, Ma Xudong, Topology Analysis of a New Coupled Inductor Dual Boost Photovoltaic Micro-inverter[J]. Automation of Electric...

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Problems solved by technology

In view of the above reasons, it is difficult for traditional step-up DC converters to achieve the goals of high efficiency, small size, low noise and low cost

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