DC/DC converter for electric vehicle high-power charging device

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

Active Publication Date: 2019-12-27
HARBIN UNIV OF SCI & TECH
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  • Abstract
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  • Claims
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AI Technical Summary

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.

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  • DC/DC converter for electric vehicle high-power charging device
  • DC/DC converter for electric vehicle high-power charging device
  • DC/DC converter for electric vehicle high-power charging device

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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

The invention discloses a DC/DC converter for an electric vehicle high-power charging device, belongs to the field of new energy vehicle charging system design and application and aims to solve problems that a DC/DC converter of a charging device in the prior art is low in a boost topology step-up ratio, low in voltage of a direct current side of a tail end load, large in device stress, slow in charging speed and difficult to meet the rapid charging requirement. Compared with a single-inductor structure, a double-inductor energy storage structure at a front end is greatly improved in the step-up ratio, a specific rear-end switch capacitor structure can enable a system to obtain higher voltage gain through a capacitor and a diode, and the direct-current output side voltage and power densityof the system are improved, moreover, an isolation type DC/DC converter with a transformer is not adopted between an output end of a rectifier and the direct-current side of the load to serve as a boosting structure. The DC converter is suitable for DC conversion in the charging process of a high-power automobile.

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 Applications(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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