Isolated boost bidirectional DC-DC converter topological structure

A technology of DC-DC and topology structure, which is applied in the direction of converting DC power input to DC power output, instruments, and adjusting electrical variables, etc. It can solve the problems of discontinuous input current, large inductance on the input side, and inability to integrate, etc., to improve Effect of voltage gain and extended gain range

CN111416521AActive Publication Date: 2020-07-14TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-07-14

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Abstract

The invention discloses a topological structure of an isolated boost bidirectional DC-DC converter. The circuit comprises a pre-stage Boost circuit, an integrated transformer and a post-stage H-bridgecircuit, wherein the pre-stage Boost circuit comprises a first two-phase interleaved Boost converter, a second two-phase interleaved Boost converter and a third two-phase interleaved Boost converter;the integrated transformer is of a coupling inductance structure and comprises a Boost inductance part and an ideal transformer structure, the first two-phase interleaved Boost converter is connectedwith the Boost inductance part of the integrated transformer in series, and the ideal transformer structure of the integrated transformer is connected with the post-stage H-bridge circuit in series.The topological structure is few in selected devices, simple in circuit and high in integration level, the problem that input current is discontinuous can be well solved, input current ripples and output voltage ripples are greatly restrained, and the topological structure can be applied to a lithium battery application scene with higher requirements for the current ripples.
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Description

technical field

[0001] The invention relates to the technical field of power electronics and electric energy conversion in electrotechnical technology, in particular to a novel topology of an isolated boost bidirectional DC-DC converter. Background technique

[0002] With the intensification of energy crisis and global warming, renewable energy sources such as lithium batteries, solar energy, and wind energy have attracted more and more attention. Compared with traditional batteries, lithium batteries have the advantages of long cruising range, repeated use, clean and pollution-free, and high energy density. Isolated boost bidirectional DC-DC converters are widely used in renewable energy fields such as lithium batteries due to the advantages of bidirectional energy flow, high boost ratio, and adjustable ratio.

[0003] The isolated boost bidirectional DC-DC converter is generally realized by a Boost converter and a DAB circuit, which has many devices and poor integration. ...

Examples

Embodiment Construction

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0023] The following describes the topology of the isolated boost bidirectional DC-DC converter according to the embodiments of the present invention with reference to the accompanying drawings.

[0024] figure 1 It is a structural schematic diagram of an isolated boost bidirectional DC-DC converter topology according to an embodiment of the present invention.

[0025] Such as figure 1 As shown, the isolated boost bidirectional DC-DC converter topology includes: a front-stage Boost circuit 100 , an integrated transformer 200 an...