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A method and system for output voltage equalization of multiple charging piles connected in series

A charging pile and output voltage technology, applied in the field of output voltage equalization method and system of multi-channel series-connected charging piles, can solve the problems of bus voltage regulation and equalization, difficulty in bus voltage equalization, etc., and achieve voltage balance and good voltage equalization effect. Effect

Active Publication Date: 2021-12-07
SHANDONG LUNENG SOFTWARE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The voltage balance method of the Vienna circuit in the previous stage can satisfy the situation that the latter stage is a single module, and it can be adjusted in the case of slight imbalance. If the output voltage is different, the energy extracted from the bus will be different. In this case, the bus voltage cannot be adjusted and balanced by the Vienna circuit of the front stage alone. It is difficult to balance the bus voltage only through the adjustment of the front stage itself. The output voltage of the two circuits of the latter stage is consistent under any circumstances, so it is necessary to increase the voltage equalization function of the latter module in constant current mode to ensure the bus balance of the former stage

Method used

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  • A method and system for output voltage equalization of multiple charging piles connected in series
  • A method and system for output voltage equalization of multiple charging piles connected in series
  • A method and system for output voltage equalization of multiple charging piles connected in series

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Embodiment 1

[0048] In order to solve the problems pointed out in the background technology, in one or more embodiments, an output voltage equalization method of a two-way series three-phase interleaved LLC is disclosed, which can realize the following two-way series connection in the constant current mode The output voltage of the three-phase interleaved LLC is consistent, thus ensuring the voltage balance of the Vienna circuit bus.

[0049] A switching power supply structure using a three-phase interleaved LLC with two circuits in series in the latter stage, such as figure 1 As shown, it includes: the front-stage Vienna rectifier circuit and the upper and lower three-phase interleaved LLC. After the three-phase AC input passes through the Vienna rectifier circuit, it becomes a voltage source of about 800V, and then divided into two 400V as the upper and lower LLC modules. The input source, the output of the LLC module is connected in series as the total output of the whole system.

[00...

Embodiment 2

[0058] On the basis of Embodiment 1, this embodiment discloses a terminal device, including a server, the server includes a memory, a processor, and a computer program stored in the memory and operable on the processor, and the processor executes The program implements the output voltage equalization method of the two-way series-connected three-phase interleaved LLC described in the first embodiment.

[0059] In addition, a charging pile is disclosed on this basis, the charging pile includes the above-mentioned terminal equipment, so as to realize output voltage equalization of two-way series charging piles.

Embodiment 3

[0061] In one or more implementations, a voltage equalization method for three-phase interleaved LLCs connected in series is disclosed.

[0062] In the switching power supply structure of the three-phase interleaved LLC with multi-channel series connection in the rear stage, the rear stage adopts the form of three or more three-phase interleaved LLC series connections. After the three-phase AC input passes through the Vienna rectifier circuit, the output voltage is evenly divided into Each three-phase interleaved LLC is used as an input source, and the outputs of all three-phase interleaved LLCs are connected in series as the total output of the entire system.

[0063] The structure of the front-stage Vienna rectifier circuit and each three-phase interleaved LLC is the same as that in Embodiment 1. The method of implementing the three-phase interleaved LLC voltage equalization in the rear stage with the above-mentioned switching power supply structure is as follows: Figure 5 ...

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Abstract

The invention discloses a method and system for output voltage equalization of multi-channel series charging piles, comprising: separately collecting the output voltage and output current signal of each three-phase interleaved LLC; and making difference between the output current and the set current reference value , carry out PI operation; after the output voltage of two-way three-phase interleaved LLC is made difference, carry out PI operation; The switch tubes of the three-phase interleaved LLC are driven, the output voltage of the corresponding three-phase interleaved LLC is adjusted, and the output voltage of the two three-phase interleaved LLCs is balanced. Beneficial effects of the present invention: the present invention can ensure that in the constant current mode, the output voltage of the three-phase interleaved LLC can be kept consistent, so that the voltages at both ends of the busbars C1 and C2 can be kept balanced, and the voltage equalization effect is good.

Description

technical field [0001] The invention relates to the technical field of charging piles, in particular to a method and system for output voltage equalization of multi-channel series charging piles. Background technique [0002] With the development trend of the new energy charging module industry, the voltage level is getting higher and higher. In order to select a power device with a low withstand voltage level, the advantage of dividing the output terminal into two modules in series is becoming more and more obvious, but the series connection of the modules may cause problems The condition of voltage equalization causes the voltage on some devices to be too high and damaged. [0003] At present, the commonly used voltage equalization method is to process it in the control loop of the previous Vienna rectifier circuit, and it can be automatically adjusted after a slight uneven voltage situation occurs. The voltage balance method of the Vienna circuit in the previous stage ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/155H02M3/335H02J7/10
CPCH02J7/06H02M3/33569H02M7/155
Inventor 谭春晓刘爱忠唐亮胡勇李新涛黄厚诚李壮李清川马文超袁宝乔亚男于波峰李勇
Owner SHANDONG LUNENG SOFTWARE TECH
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