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A dc/dc converter for a high-power charging device for an electric vehicle

A high-power charging, electric vehicle technology, applied in electric vehicle charging technology, electric vehicles, battery circuit devices, etc., can solve the problems of slow charging speed, low boost topological boost ratio, and large device stress, and achieve improved conversion. efficiency, improved power density, and high voltage gain

Active Publication Date: 2021-10-01
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0005] The present invention aims to solve the problems of low boosting ratio of DC / DC converter boost topology of the existing charging device, low voltage at the DC side of the terminal load, large device stress, slow charging speed, and difficulty in meeting the demand for fast charging.

Method used

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  • A dc/dc converter for a high-power charging device for an electric vehicle
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  • A dc/dc converter for a high-power charging device for an electric vehicle

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specific Embodiment approach 1

[0035] Specific implementation mode one: the following combination Figure 1 to Figure 6 Describe this embodiment, a DC / DC converter for a high-power charging device for an electric vehicle described in this embodiment includes a DC / DC converter main circuit 1;

[0036] The DC / DC converter main circuit 1 includes a front-end boost structure and a back-end switched capacitor structure;

[0037] The front-end boost structure includes energy storage inductor L1, energy storage inductor L2, diode D1, switching tube S1, switching tube S2 and switching tube S3;

[0038] The back-end switched capacitor structure includes diode D2, diode D3, diode D4, capacitor C1, capacitor C2 and capacitor C3;

[0039] One end of the energy storage inductor L1 is connected to the positive end of the power supply V1; the other end of the energy storage inductor L1 is connected to the drain of the switching tube S1, and the source of the switching tube S1 is connected to the negative end of the sourc...

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Abstract

A DC / DC converter for a high-power charging device for an electric vehicle belongs to the field of design and application of a charging system for a new energy vehicle. The invention solves the problems of low boosting ratio of DC / DC converter boosting topology, low voltage of terminal load DC side, large device stress, slow charging speed and difficult to meet fast charging requirement in the existing charging device. Compared with the single-inductance structure, the double-inductance energy storage structure at the front end of the present invention greatly improves the boost ratio, and the unique back-end switched capacitor structure can enable the system to obtain higher voltage gain through capacitors and diodes, improving the DC output side voltage and The power density of the system. At the same time, an isolated DC / DC converter with a transformer is not used as a boost structure between the output end of the rectifier and the DC side of the load. The invention is suitable for DC conversion in the charging process of high-power automobiles.

Description

technical field [0001] The invention belongs to the field of design and application of charging systems for new energy vehicles, and in particular relates to DC converters. Background technique [0002] Electric vehicles are driven by electric energy, which is of great significance in alleviating the shortage of petroleum energy and reducing harmful gas emissions. It has become a global trend to vigorously develop the electric vehicle industry. The charging infrastructure is an important part of the electric vehicle industry. As an important part of the electric vehicle charging infrastructure, the charging device's performance will directly affect the development of the electric vehicle industry. Therefore, a high-power electric vehicle charging device with complete functions, safety and reliability, good compatibility, and fast charging speed has important practical engineering significance for the overall development of the electric vehicle industry. [0003] The current...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/06H02M3/157H02M3/158H02J7/02B60L53/00
CPCB60L2210/14B60L53/00H02M3/06H02M3/157H02M3/158H02M1/007Y02T10/70Y02T10/7072Y02T10/92Y02T90/14
Inventor 吴晓刚刘郑心于渤洋
Owner HARBIN UNIV OF SCI & TECH
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