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A medium and high voltage integrated vehicle charging system based on series digital voltage regulator

A car charging and voltage stabilizer technology, applied in electric vehicle charging technology, charging stations, electric vehicles, etc., can solve the problems of unfavorable normal operation of electrical equipment, increase system loss, and long implementation time, so as to improve operating efficiency and stability performance, reduction in number and switching frequency, and reduction in filtering cost

Active Publication Date: 2022-07-29
QINGDAO TOPSCOMM COMM +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large number of modules in the input stage of the existing car charging system, there will be problems such as high control difficulty, high cost, and large volume.
Moreover, in the process of modulating the voltage in the input stage part, due to the small number of levels generated, high-frequency ripples will be generated, which will increase system loss and is not conducive to the normal operation of electrical equipment. Although increasing the number of modules can increase the number of levels, it will bring about cost
[0003] The traditional methods of removing high-frequency ripple include increasing the inductance and output capacitor for filtering, increasing the control to suppress ripple, and increasing the number of modules to generate more levels. These methods can suppress high-frequency ripple to a certain extent. wave, but it will increase the system cost and control difficulty, and the realization time will be longer

Method used

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  • A medium and high voltage integrated vehicle charging system based on series digital voltage regulator
  • A medium and high voltage integrated vehicle charging system based on series digital voltage regulator
  • A medium and high voltage integrated vehicle charging system based on series digital voltage regulator

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Embodiment Construction

[0020] Hereinafter, the specific embodiments of the present invention will be further described with reference to the accompanying drawings.

[0021] The structure of the automobile charging system applied by the present invention is as follows: figure 1 As shown, it is divided into three-level structure. The input stage converts 10kV alternating current to high voltage direct current; the intermediate isolation stage converts high voltage direct current to low voltage direct current, and has the function of electrical isolation; the output stage is the charging pile module, which changes the level of direct current to charge the car.

[0022] figure 2 For the specific topology of the digital voltage regulator, it is composed of H-bridge topology with different DC side voltages. The circuit topology of the medium and high voltage integrated vehicle charging system based on the series digital voltage regulator is as follows: image 3 As shown, its structure includes a grid-...

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Abstract

The invention discloses a medium and high voltage integrated vehicle charging system based on a series-connected digital voltage stabilizer, and belongs to the technical field of vehicle charging. Its structure includes that one end of the grid-side filter is connected to the power grid, the other end is connected to the AC side of the input stage, the input stage of the module is cascaded and connected to the AC side of the digital voltage stabilizer, and the last three-phase digital voltage stabilizer is connected to the AC side. Connected to one point to form a star structure, the high voltage DC side of the input stage and the DC side of the digital voltage stabilizer are respectively connected to the high voltage DC side of the intermediate isolation stage, and the low voltage DC side of the isolation stage of each module is connected in parallel with the charging pile input DC side connected. The present invention reduces the ripple in the current by increasing the number of modulated levels, which can greatly reduce the inductance value of the filter inductance, thereby reducing the filter cost, and is also conducive to improving the operating efficiency of the system, and also reducing the input stage high-voltage module. number and switching frequency to improve system efficiency.

Description

technical field [0001] The invention relates to the technical field of medium and high voltage vehicle charging systems, in particular to a medium and high voltage integrated vehicle charging system based on series-connected digital voltage regulators. Background technique [0002] The medium and high voltage integrated vehicle charging system is to convert the 10kV alternating current of the power grid into the high voltage direct current through the input stage, and then convert the high voltage direct current into low voltage direct current through the isolation part to realize the voltage level transformation and electrical isolation. Finally, the charging pile module is used to charge the electric vehicle, and different charging speeds are achieved according to the different power of the charging pile. The vehicle charging system can not only charge electric vehicles, but also realize functions such as high-voltage direct current transmission, static reactive power comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219H02M3/335H02M1/14B60L53/10
CPCH02M7/219H02M3/33584H02M1/14B60L53/10Y02T90/14
Inventor 王建华范建华徐鹏飞李健勋王嘉伟王庆园李鸿儒张建李伟吴雪梅卢峰林志超程艳艳叶齐
Owner QINGDAO TOPSCOMM COMM
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