A Single-Switch High-Gain Boost Converter

Abstract

The invention provides a single-switch high-gain boost converter which mainly comprises a normal Boost circuit link and an energy storage circuit link, wherein the normal Boost circuit link is formed by a direct current voltage source, a first inductor, a fourth diode, a fourth capacitor and an output load, and the energy storage circuit link is formed by a first diode, a second diode, a third diode, a first capacitor, a second capacitor, a third capacitor, a second inductor and a third inductor. The single-switch high-gain boost converter is simple in structure, and has larger voltage gains under the condition of identical duty ratio when compared with an existing direct current boost type converter. A switch tube bears low on-off stress when turned off, the circuit is controlled to work only through one switch tube, controlling is simple, and the single-switch high-gain boost converter can be applied to a direct current voltage change occasions needing high voltage gains.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to a single-switch high-gain boost converter. Background technique [0002] In a solar power generation system or a fuel cell system, since a single solar cell or a single fuel cell provides direct current with a low voltage, it cannot meet the electricity demand of existing electrical equipment, nor can it meet the requirements of grid connection. It is necessary to convert the low-voltage direct current into the actually required high-voltage direct current. Therefore, the boost converter with high gain and stable performance has become a research hotspot, which is of great significance to promote the development of photovoltaic and fuel cell industries. [0003] The most basic boost converter is a single-tube Boost converter. However, the boost range of this converter is very limited, and it is difficult to meet the conversion requirements of high gain. At p...

AI Technical Summary

Problems solved by technology

At this time, the conversion process of electric energy is actually changed from the original DC-DC to DC-AC-AC-DC, and the energy conversion efficiency of the whole system is reduced.

The second is to use coupled inductors, but the structure of coupled inductors is complex, which is not conducive to industrial processing, it is difficult to ensure the consistency of the circuit, and it will cause excessive voltage stress of switching devices, which will cause electromagnetic interference and other effects, resulting in large operating losses of the converter.

The third is to add cascaded boost units, the more units, the greater the voltage gain, but the more circuit components, the more complex the structure

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