A High Gain Cuk-DC Converter with Inductor-Capacitor Switching Network

Abstract

The invention discloses a high-gain Cuk DC converter with an inductor-capacitor switch network, which includes a basic Cuk converter and several inductor-capacitor switch network units, and the inductor-capacitor switch network unit includes an inductor, a capacitor and two Diodes can flexibly expand the voltage gain by adding different numbers of inductor-capacitor switch networks. When n inductor-capacitor switch networks are introduced, the output voltage is twice the input voltage. The high-gain Cuk DC converter with an inductor-capacitor switching network has the advantages of simple structure, convenient control, high voltage gain, small voltage stress of switching devices, and easy expansion, and can complete the DC bus required for photovoltaic cells to grid-connected inverters between high-gain boost tasks.

Description

technical field [0001] The invention relates to the field of DC-DC converters, in particular to a high-gain Cuk DC converter with an inductor-capacitor switch network. Background technique [0002] With the energy crisis and environmental pollution, solar energy and fuel cells have become a major part of the world's energy structure. However, the output voltage of new energy power generation units such as photovoltaics and fuel cells is far lower than the DC bus voltage required for grid connection, and a high-gain step-up DC-DC converter is usually required as an interface circuit. In addition, high-gain step-up DC-DC converters also play an important role in applications such as UPS power supply systems, electric vehicles, and aviation power supplies. [0003] Due to the existence of the input and output inductance, the Cuk converter can reduce the input and output current pulsation and ripple, which is beneficial to suppress the problem of electromagnetic interference, s...

AI Technical Summary

Problems solved by technology

But the output voltage gain of the traditional Cuk converter can only reach 10 times

In order to increase the voltage gain, various improvement schemes have been proposed for Cuk in the prior art. There are mainly three ways: the first one uses coupled inductors to achieve high-gain boost, but the use of coupled inductors will cause excessive voltage stress on switching devices , and bring electromagnetic interference at the same time; the second is a fusion switched inductor network; the third is a fusion switched capacitor network, the second and third circuits are simply to increase the number of inductors or capacitors to expand the voltage gain

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