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Output voltage-sharing method and system for multiple paths of series charging piles

A charging pile and output voltage technology, which is applied to the output voltage equalization method and system field of multi-channel series charging piles, can solve difficult problems such as bus voltage balance and bus voltage adjustment balance, and achieve good voltage equalization effect and voltage balance Effect

Active Publication Date: 2020-06-02
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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  • Output voltage-sharing method and system for multiple paths of series charging piles
  • Output voltage-sharing method and system for multiple paths of series charging piles
  • Output voltage-sharing method and system for multiple paths of series charging piles

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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 an output voltage-sharing method and system for multi-path series charging piles. The method comprises the steps: respectively collecting the output voltage and output currentsignals of each path of three-phase interleaved LLC; subtracting the output current from a set current reference value, and performing PI operation; subtracting the output voltage of the two paths ofthree-phase interleaved LLC, and then performing PI operation; subtracting results of the two PI operations to serve as modulation waves of a PWM output signal, and generating the PWM output signal; and enabling a PWM to output a signal to drive a switching tube of the three-phase interleaved LLC to adjust the output voltage of the corresponding three-phase interleaved LLC so as to realize the output voltage equalization of the two paths of three-phase interleaved LLC. The invention has the beneficial effects that the output voltage of the three-phase interleaved LLC can be kept consistent ina constant-current mode, so the voltages at the two ends of a bus C1 and a bus C2 are kept balanced, and the voltage equalizing 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 Applications(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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