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Two-phase interlaced flying capacitor bidirectional direct-current converter based on coupling inductor

A bidirectional DC conversion and DC converter technology, which is applied in the direction of converting DC power input to DC power output, power transmission AC network, and adjusting electrical variables, can solve problems such as large current ripple and performance degradation of the converter, and achieve reduction The effect of small voltage, reduced volume, good application and development prospects

Pending Publication Date: 2022-07-29
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current ripple of the current DC converter of the existing multi-level topology is still large, which greatly reduces the performance of the converter

Method used

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  • Two-phase interlaced flying capacitor bidirectional direct-current converter based on coupling inductor
  • Two-phase interlaced flying capacitor bidirectional direct-current converter based on coupling inductor
  • Two-phase interlaced flying capacitor bidirectional direct-current converter based on coupling inductor

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Embodiment Construction

[0046] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0047] The present application provides a two-phase interleaved flying capacitor bidirectional DC converter based on coupled inductors, comprising sequentially arranged first to fourth bridge arms, a pair of coupled inductors, four flying capacitors and two filter capacitors. A bridge arm is connected to the middle of the fourth bridge arm through a first coupled inductance to form an a-phase H bridge, the second bridge arm is connected to the middle of the third bridge arm through a second coupled inductance to form a b-phase H bridge, and the first and reversely coupled with the second coupled inductor. Wherein, each group of bridge arms includes first to fourth power switch tubes connected in series in sequence, and the connected ends of the second and third power switch tubes serve as the middle part of the bridge arm. Two ends of the fly...

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Abstract

The invention discloses a two-phase interleaving flying capacitor bidirectional direct-current converter based on coupling inductors, and relates to the technical field of power electronics, the direct-current converter is in two-phase interleaving parallel connection, and the inductors between the two phases are magnetically coupled; comprising four groups of bridge arms, four flying capacitors, a pair of coupling inductors and two filter capacitors, the coupling inductors are in reverse coupling, each group of bridge arms is formed by connecting four power switch tubes in series, and the number of the power switch tubes is sixteen; the bidirectional boost-buck converter is characterized in that bidirectional boost-buck can be carried out, the voltage stress of each power switch tube is half of that of a voltage bus, ripple waves of output current can be reduced through staggered parallel connection, the conversion efficiency of the converter is improved, and the magnetic integration technology further reduces inductance and the size of the converter, and meanwhile the conversion efficiency of the converter is improved. The phase current ripple of each phase inductor is reduced, and the dynamic performance of the converter is improved. The method has good application and development prospects for the energy storage link of a new energy distribution power generation system such as light, wind and the like.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a two-phase interleaved flying capacitor bidirectional DC converter based on coupled inductors. Background technique [0002] Energy storage is an important link in photovoltaic and wind power generation systems. The use of energy storage batteries in conjunction with renewable energy can make renewable energy generation match the grid demand in terms of time and intensity, and reduce the randomness of renewable energy generation. Reduce the voltage fluctuation of the DC microgrid and improve the quality of power generation. The energy storage medium is usually connected to the high-voltage bus through a bidirectional DC / DC converter, which can realize the bidirectional flow of energy between the energy storage medium and the DC bus, and can realize the control and efficient utilization of energy in the system. [0003] At present, the commonly used bidirectional DC / DC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M1/088H02M1/14H02J3/38H02J3/32H02J3/36
CPCH02M3/158H02M1/088H02M1/14H02J3/381H02J3/32H02J3/36H02J2300/24H02J2300/28
Inventor 毕恺韬刘柳李安龙朱一昕艾建樊启高
Owner JIANGNAN UNIV
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