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Multi-level equalizing resonance zero current soft switch DC-DC converter

A DC-DC and soft-switching technology, applied in high-efficiency power electronic conversion, current collectors, battery circuit devices, etc., can solve problems such as unbalanced unit capacitor voltage and unsatisfactory drive signals, so as to increase life, realize self-balancing, Simple effects with controls

Active Publication Date: 2015-10-28
BEIJING JIAOTONG UNIV +1
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Problems solved by technology

And no matter what kind of modular multilevel DC converter (DC-MMC), the cell capacitor in the single-stage MMC is in a suspended state. In the actual operation process, due to the different losses of the cells, the drive signal is not ideal and there are delays and other factors. Make the cell capacitor voltage unbalanced without being specifically controlled

Method used

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  • Multi-level equalizing resonance zero current soft switch DC-DC converter
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  • Multi-level equalizing resonance zero current soft switch DC-DC converter

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Embodiment Construction

[0045] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0046] Such as figure 1 , 2 , 3, the multi-level voltage equalization resonant zero-current soft-switching DC-DC converter of the present invention includes:

[0047] The DC voltage equalizing capacitor bank is composed of m DC voltage equalizing capacitors connected in series, where m is an integer ≥ 2;

[0048] At least m-1 two-port DC-DC resonant soft switching conversion units DCRS cells are connected between different capacitors in the DC equalizing capacitor bank.

[0049] On the basis of the above technical solutions, such as figure 1 Shown is a schematic structural diagram of the DC voltage equ...

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Abstract

The invention relates to a multi-level equalizing resonance zero current soft switch DC-DC converter. The DC-DC converter is composed of a direct current equalizing capacitor group and two-port DC-DC resonance soft switch conversion units connected with capacitors in the direct current equalizing capacitor group. For the converter with a level number of (m+1) (m is an integer and is more than or equal to 2, similarly hereinafter), the direct current equalizing capacitor group is composed of m direct current equalizing capacitors (Cm, C<m-1>,..., C2, C1) in series connection from top to bottom in order, and the potentials of the capacitors (Cm, C<m-1>,..., C2, C1) in the direct current equalizing capacitor group decrease from top to bottom in order. The capacitors in the direct current equalizing capacitor group are connected with at least (m-1) two-port DC-DC resonance soft switch conversion units. The DC-DC converter achieves capacitance and voltage self-balancing, all the switch tubes and diodes achieve zero current switching, the two-port DC-DC resonance soft switch conversion units work without affecting each other and independently mutually, and the whole converter system has characteristics of structure modularization and simple control mode.

Description

technical field [0001] The invention relates to the technical field of multi-level DC conversion, in particular to a multi-level voltage equalizing resonance zero-current soft-switching DC-DC converter. Used to realize DC voltage conversion. Background technique [0002] Just as AC transformers are indispensable in AC power transmission and distribution systems and some AC voltage conversion applications, DC power transmission and distribution systems and some DC voltage conversion applications also require DC converters that specialize in DC voltage level conversion. [0003] In the DC transmission and distribution system, the DC converter is mainly used for the interface between the DC transmission and distribution network and the load or the upper-level grid, and realizes the conversion of the internal voltage level of the DC transmission and distribution network. Due to the higher voltage level and higher power of the DC transmission and distribution network, high volta...

Claims

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Application Information

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IPC IPC(8): H02M3/06H02J7/00
CPCH02J7/00H02M3/06Y02B70/10
Inventor 郑琼林黄永善杨晓峰张捷频游小杰
Owner BEIJING JIAOTONG UNIV
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