Output-floating input-parallel high-gain Boost converting circuit and switching method thereof

Abstract

The invention discloses an output-floating input-parallel high-gain Boost converting circuit and a switching method thereof and belongs to the field of power electronics. The output-floating input-parallel high-gain Boost converting circuit consists of an input portion, a power conversion portion and a load portion, wherein the power conversion portion can be divided into a first module and a second module which are in structural symmetry. A converter comprises a coupling inductor M1 with two windings L11 and L12, a coupling inductor M2 with two windings L21 and L22, two power switching tubes S1 and S2, two clamping diodes DCC1 and DCC2, two clamping capacitors CC1 and CC2, two output diodes DC1 and DC2 and two output capacitors C1 and C2. On the basis of the output-floating input-parallel high-gain Boost converting circuit, the boost characteristic of the coupling inductors is combined with series-connection boost effects of the output capacitors. The output-floating input-parallel high-gain Boost converting circuit and the switching method thereof have the advantages that the problem that a traditional Boost circuit is limited in voltage gain is solved, the converting circuit is easily to be expanded into multiple phases, and input current ripples can be reduced effectively through application of an interleaving switch-on technology to the switching tubes in the two modules.

Description

technical field [0001] The invention belongs to the field of DC-DC conversion circuits of power electronics technology, and in particular relates to an output floating input parallel high-gain Boost conversion circuit and a switching method. Background technique [0002] With the increasing global energy crisis and environmental pollution, renewable energy sources such as solar energy, wind energy, geothermal energy, and biomass energy have attracted worldwide attention. However, due to the influence of environment, temperature and other factors, the output voltage of renewable energy is low and fluctuates greatly. In practical applications, a variety of energy combinations are often required to ensure the stability and practicability of renewable energy power generation. To achieve the DC bus voltage required by the grid-connected inverter, a high-gain boost converter is required in practical applications to boost the output voltage of renewable energy. [0003] Commonly u...

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Problems solved by technology

[0005] The present invention aims at problems such as the low voltage gain of the existing boost converter, the Boost converter working at the limit duty cycle under high gain, and the relatively large input current and voltage ripple, etc., and proposes an interleaved parallel high-gain Boost converter circuit, Ideal for power electronics applications requiring high gain

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