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A charging pile and charging method

A charging pile and voltage technology, used in charging stations, electric vehicle charging technology, electric vehicles, etc., can solve the problems of large output current, low performance index, complex control, etc., and achieve the effect of wide output voltage range and constant power output

Active Publication Date: 2021-10-08
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the miniaturization of the charging pile and the limitation of the capacity of various power devices, when the output power of the charging pile is maintained at the same level, there must be a large output current when the output voltage is low, and when the output voltage is high, it will give the device The selection of the model brings great difficulties
In order to broaden the output voltage range and increase the output power, in the field of electric vehicle charging piles, multiple machines are often connected in series and parallel to achieve constant power output in a wide output voltage range, but this is very costly and complicated to control
[0004] In order to adapt to the diversity of power battery voltages of electric vehicles, it has become a difficult problem to select devices with lower performance indicators as much as possible while achieving the two indicators of wide output voltage range and constant power output. It is difficult for existing topological circuits to solve this problem. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] figure 1 It is a schematic structural diagram of a charging pile provided in Embodiment 1 of the present invention. Such as figure 1 As shown, the charging pile includes:

[0031] A power conversion unit for outputting independent voltages, the power conversion unit includes a power conversion unit 1 and a power conversion unit 2, the power conversion unit 1 outputs independent voltages Vo1+, Vo1-, and the power conversion unit 2 outputs an independent voltage Vo2+ , Vo2-;

[0032] A switching unit for switching, the switching unit includes a switching unit 1, a switching unit 2 and a switching unit 3; the switching unit 1 is connected in parallel at the positive output terminal of the power conversion unit 1, the Vo1+ and the power conversion Between the Vo2+ of the positive output terminal of the unit 2, the switching unit 2 is connected in parallel between the Vo1- of the negative output terminal of the power conversion unit 1 and the Vo2- of the negative output t...

Embodiment 2

[0048] Embodiment 2 of the present invention provides a charging method applied to the charging pile provided in Embodiment 1. The charging method includes:

[0049] When the switching unit 3 is turned off, the switching units 1 and 2 are turned on, the positive output terminal Vo1+ and the positive output terminal Vo2+ are connected together through the switching unit 1, and the negative output terminal Vo1- and the negative output terminal Vo2- are connected through the The switching unit 2 is connected together, the power conversion unit 1 and the power conversion unit 2 are connected in parallel, the total output voltage of the charging pile is equal to each independent output voltage, and the total output current is equal to the sum of each independent output current .

[0050] Wherein, the method also includes:

[0051] When the switching unit 3 is turned on, the switching units 1 and 2 are turned off, the positive output terminal Vo2+ and the negative output terminal V...

Embodiment 3

[0055] figure 2 It is a schematic structural diagram of the charging pile provided in Embodiment 3 of the present invention, image 3 It is a schematic structural diagram of another charging pile provided in Embodiment 3 of the present invention.

[0056] In Embodiment 3 of the present invention, the power conversion unit includes but is not limited to an input source, an LLC resonant conversion circuit and a rectifier circuit. The topology of the LLC resonant conversion circuit series includes ordinary half-bridge, clamped diode half-bridge, and full-bridge , Three-phase half-bridge type, etc.; the rectifier circuit can use a full-bridge rectifier circuit or a full-wave rectifier circuit.

[0057] In the third embodiment of the present invention, the switching unit includes but is not limited to a switching device or a diode, and the switching unit 1 and the switching unit 2 can be full-controlled or half-controlled semiconductor switching devices ( image 3 ), or a low fr...

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Abstract

The embodiment of the present invention discloses a charging pile and a charging method. The charging pile includes: a power conversion unit for outputting an independent voltage, a switching unit for switching, and a discharge branch. Through the series-parallel switching of the power conversion unit, the problem and defect that the charging module in the prior art can only maintain constant power output within a certain output voltage range can be overcome, and the effect of constant power output in a wide output voltage range can be achieved.

Description

technical field [0001] Embodiments of the present invention relate to but are not limited to a charging pile and a charging method. Background technique [0002] With the increasing shortage of oil resources, pure electric vehicles have become an important breakthrough for the automotive industry to solve the energy crisis. In recent years, the country has issued a series of preferential policies and measures to promote electric vehicles. It can be predicted that with the development of the electric vehicle industry, the market for supporting charging systems is bright. [0003] To realize the large-scale popularization and use of electric vehicles, charging piles with high efficiency, high reliability and wide charging range are essential. At present, the general electric vehicles on the market include buses and cars. The voltage of the power battery of the bus is generally above 600V, while the voltage of the power battery of the car is generally around 400V. Due to the ...

Claims

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Application Information

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IPC IPC(8): B60L53/31B60L53/66
CPCB60L53/31B60L53/60Y02T90/16Y02T10/70Y02T10/7072Y02T90/12
Inventor 熊英杰
Owner ZTE CORP
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