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Topology of single-stage dab-llc hybrid bidirectional dc-dc converter

A DC-DC, converter technology, applied in the field of topology structure of single-stage DAB-LLC hybrid bidirectional DC-DC converter, can solve the problem of inability to achieve natural bidirectional power control, low output regulation capability, large turn-off loss, etc. problems, to achieve the effect of reducing control complexity, stabilizing output and extending service life

Active Publication Date: 2021-05-04
CENT SOUTH UNIV
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Problems solved by technology

[0004] The present invention provides a topology structure of a single-stage DAB-LLC hybrid bidirectional DC-DC converter. The problem of high breaking loss

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  • Topology of single-stage dab-llc hybrid bidirectional dc-dc converter

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Embodiment Construction

[0059] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0060] The present invention provides a single-stage DAB-LLC hybrid bidirectional DC-DC converter for the existing converters that cannot realize natural bidirectional power control, low output regulation ability, low efficiency and large turn-off loss. topology.

[0061] Such as Figure 1 to Figure 3 As shown, the embodiment of the present invention provides a topology of a single-stage DAB-LLC hybrid bidirectional DC-DC converter, including: a first DC power supply 1; an LLC series resonant converter 2, and the LLC series resonant The first end of the converter 2 is electrically connected to the positive end of the first DC power supply 1; the DAB converter 3, the first end of the DAB converter 3 is connected to the second end of the LLC series resona...

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Abstract

The present invention provides a topology structure of a single-stage DAB-LLC hybrid bidirectional DC-DC converter, comprising: a first DC power supply; an LLC series resonant converter, the first end of the LLC series resonant converter is connected to the first end of the LLC series resonant converter The positive end of the first DC power supply is electrically connected; the DAB converter, the first end of the DAB converter is electrically connected to the second end of the LLC series resonant converter, and the second end of the DAB converter is connected to the second end of the DAB converter. The negative end of the first DC power supply is electrically connected, the third end of the DAB converter is electrically connected to the third end of the LLC series resonant converter, and the fourth end of the DAB converter is electrically connected to the LLC The fourth terminal of the series resonant converter is electrically connected. The single-stage DAB-LLC hybrid bidirectional DC-DC converter of the present invention can realize closed-loop adjustment of the output voltage of the converter when the switching frequency is kept constant, and realize the natural bidirectional flow of energy in the forward and reverse operation modes, Improve the transmission efficiency and reliability of the converter.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a topological structure of a single-stage DAB-LLC hybrid bidirectional DC-DC converter. Background technique [0002] In recent years, more and more attention has been paid to DC transformers, and a lot of related research work has been done, and they are widely used in applications requiring isolation and high efficiency, such as photovoltaic energy storage, new energy vehicles, solid-state transformers, and point-of-load. A single LLC series resonant converter or a single DAB converter is used, but they all have some disadvantages. [0003] When operating at the resonant frequency, the LLC series resonant converter has the maximum conversion efficiency because it can obtain soft switching and low conduction loss, while the circulating current of the LLC converter increases when the voltage gain deviates from the gain at the resonant point, Thereby reducing the conversion effic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33515H02M3/33584H02M1/0083Y02B70/10
Inventor 许国廖粤峰粟梅孙尧韩华王辉刘永露但汉兵熊文静柳张杰
Owner CENT SOUTH UNIV
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