Topological structure of single-stage DAB-LLC hybrid bidirectional DC-DC converter
A technology of DC-DC and topological structure, which is applied in the direction of converting DC power input to DC power output, instrumentation, and adjusting electrical variables, etc. It can solve the problems of inability to realize natural two-way power control, low output regulation ability, and large turn-off loss. , to achieve the effect of reducing the complexity of control, stabilizing output and prolonging the service life
Active Publication Date: 2020-01-21
CENT SOUTH UNIV
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[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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[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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The invention provides a topological structure of a single-stage DAB-LLC hybrid bidirectional DC-DC converter. The single-stage DAB-LLC hybrid bidirectional DC-DC converter includes: a first DC powersupply; an LLC series resonant converter having a first end electrically connected to the positive end of the first DC power supply; and a DAB converter having a first end electrically connected to the second end of the LLC series resonant converter, a second end electrically connected to the negative end of the first DC power supply, a third end electrically connected to the third end of the LLCseries resonant converter, and a fourth end electrically connected to the fourth end of the LLC series resonant converter. The single-stage DAB-LLC hybrid bidirectional DC-DC converter of the presentinvention can realize closed-loop regulation of the output voltage of the converter while maintaining a constant switching frequency, realizes a natural bidirectional energy flow in forward and backward operating modes, and improves the transmission efficiency and the 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...
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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