Two-phase interleaved capacitor clamping type ultrahigh-gain direct-current converter based on coupling inductance

Abstract

The invention discloses a two-phase interleaved capacitor clamping type ultrahigh-gain direct-current converter based on coupling inductance. The two-phase interleaved capacitor clamping type ultrahigh-gain direct-current converter based on coupling inductance comprises a two-phase interleaved Boost structure, a first capacitor clamping circuit and a second capacitor clamping circuit, wherein thetwo-phase interleaved Boost structure comprises an input source, a first coupling inductance primary winding, a second coupling inductance primary winding, a first switch tube and a second switch tube; the first capacitor clamping circuit comprises a first capacitor, a third capacitor, a first diode, a second diode and a second coupling inductance secondary winding, wherein the second capacitor clamping circuit comprises a second capacitor, a fourth capacitor, a third diode, a fourth diode and a first coupling inductance secondary winding. The ultrahigh-gain direct-current converter in the embodiment of the invention has the advantages of being symmetrical in topological structure, simple in switch control, ultra high in voltage gain and ultra low in switch tube voltage stress, and is verysuitable for a low voltage input and high voltage output application occasion, in which a low-voltage high-current gallium nitride device is used.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a two-phase interleaved capacitor-clamped ultra-high-gain DC converter based on coupled inductors. Background technique [0002] As the status of smart grid in the power grid system continues to rise, more and more attention has been paid to the construction and research of smart grid. Among them, AC-DC hybrid micro-grid has become a key technology supported by the State Grid. However, the output voltage of most new energy power generation is relatively low, such as fuel cells, photovoltaic power generation, etc., generally 20V to 60V, and the generated electric energy needs to be connected to the DC bus through a high-gain DC converter. The DC bus of the AC-DC hybrid microgrid is generally higher, such as 400V or 750V. In addition, in the construction of AC and DC microgrids, power semiconductor devices are the main cost, and the higher the voltage stress is, the cost...

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Problems solved by technology

[0005] However, this converter does not combine two-phase interleaved parallel coupled inductors with other boost technologies, which makes it impossible to have an absolute advantage in applications with higher gain requirements, and the voltage stress can only be reduced by relying on two-phase interleaved structure.

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