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High-frequency high-transformation-ratio bidirectional DC/DC converter based on coupled inductors

A technology of coupled inductors and converters, applied in the field of DC/DC converters, can solve the problems of high switching stress and low system efficiency of non-isolated bidirectional DC/DC converters, and achieve the effect of small switching stress and high system efficiency

Inactive Publication Date: 2019-07-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of high switching stress and low system efficiency of the existing non-isolated bidirectional DC / DC converter, the present invention proposes a high frequency and high transformation ratio bidirectional DC / DC converter based on coupled inductance

Method used

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  • High-frequency high-transformation-ratio bidirectional DC/DC converter based on coupled inductors
  • High-frequency high-transformation-ratio bidirectional DC/DC converter based on coupled inductors
  • High-frequency high-transformation-ratio bidirectional DC/DC converter based on coupled inductors

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Embodiment

[0037] Embodiment: combine below Figure 1 to Figure 19 This embodiment will be described in detail.

[0038] The high frequency and high ratio bidirectional DC / DC converter based on coupled inductance described in this embodiment includes a first filter unit, a buck-boost unit and a second filter unit;

[0039] When the DC / DC converter works in boost mode, the first filter unit is used to filter the input DC voltage signal of the buck-boost unit, and the second filter unit is used to filter the output DC voltage signal of the buck-boost unit filter;

[0040] When the DC / DC converter works in buck mode, the second filter unit is used to filter the input DC voltage signal of the buck-boost unit, and the first filter unit is used to filter the output DC voltage signal of the buck-boost unit filter;

[0041] The buck-boost unit includes a coupled inductor L 1 , coupled inductance L 2 , Resonant capacitance C r , switch tube S 1 , switch tube S 2 and switch tube S 3 , swi...

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Abstract

The invention relates to a high-frequency high-transformation-ratio bidirectional DC / DC converter based on coupled inductors, belongs to the technical field of power electronics and solves the problems that an existing non-isolated bidirectional DC / DC converter is high in switching stress and low in system efficiency. The DC / DC converter comprises a first filter unit, a boost-buck unit and a second filter unit. The first filter unit and the second filter unit are used for input filtering and output filtering of the boost-buck unit. The boost-buck unit comprises a coupled inductor L1, a coupledinductor L2, a resonant capacitor Cr, a switching tube S1, a switching tube S2 and a switching tube S3, and the switching tube S1, the switching tube S2 and the switching tube S3 are respectively provided with a body diode. The coupled inductor L1, the coupled inductor L2, the switching tube S1 and the switching tube S3 form a coupled inductor type boost circuit. The resonant capacitor Cr and leakage inductances of the two coupled inductors form an LC series resonant unit, and the LC series resonant unit, the switching tube S2 and the switching tube S3 form a half-bridge converter topology structure.

Description

technical field [0001] The invention relates to a DC / DC converter and belongs to the technical field of power electronics. Background technique [0002] In recent years, with the development of photovoltaic power generation, DC microgrid and new energy vehicles, related energy transmission technologies have received extensive attention. Among them, the bidirectional DC / DC converter, as a powerful tool for bidirectional energy transmission, has become a research focus and hot spot in the field of energy transmission at this stage. At the same time, with the increasing requirements of the existing related technologies for the lightweight, miniaturization and high power density of the switching power supply, the switching power supply is gradually developing towards high frequency. Therefore, high-frequency bidirectional DC / DC converters with high efficiency have important theoretical significance and practical value. However, the existing bidirectional DC / DC converters mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
CPCH02M3/1584H02M1/0058Y02B70/10
Inventor 管乐诗王懿杰朱陌痕徐殿国王卫
Owner HARBIN INST OF TECH
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