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Middle-high voltage electric vehicle charging station series module redundancy monitoring scheme

A vehicle charging and series module technology, applied in electric vehicle charging technology, electric vehicles, charging stations, etc., can solve the problems of increasing the cost of relays, unreliable feedback signals, reducing the life of relays, etc., to improve the accuracy of voltage detection and cost. Low, responsive effects

Active Publication Date: 2021-03-05
QINGDAO TOPSCOMM COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This mode requires an additional set of contacts for the relay, increasing the cost of the relay and reducing the life of the relay
And after the auxiliary contact is oxidized for a long time, it is prone to the problem of poor contact, resulting in unreliable feedback signal

Method used

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  • Middle-high voltage electric vehicle charging station series module redundancy monitoring scheme
  • Middle-high voltage electric vehicle charging station series module redundancy monitoring scheme
  • Middle-high voltage electric vehicle charging station series module redundancy monitoring scheme

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Embodiment Construction

[0025] Hereinafter, specific embodiments of the present invention will be further described in conjunction with the accompanying drawings.

[0026] The topological structure diagram of the series modules of the medium and high voltage electric vehicle charging station applied in the present invention is as follows figure 1 As shown, the principle of the module redundancy monitoring scheme is as follows figure 2 Shown:

[0027] The working principle of the circuit of the present invention is as follows:

[0028] Step 1: After the input terminal is connected to the AC voltage, the input voltage is scaled down by the first-stage operational amplifier circuit, and the AC signal is converted into a DC signal, and the high-frequency signal is filtered out to provide a more stable output for the second-stage operational amplifier. input signal.

[0029] The "first-stage operational amplifier circuit" consists of figure 2 Middle resistors R1, R2, R3, R4, R5, R6, R10, R11, R12, R1...

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Abstract

The invention discloses a middle-high voltage electric vehicle charging station series module redundancy monitoring scheme, which is characterized in that through voltage sampling and comparison, theredundancy state is sent to a main control chip after optocoupler isolation, and the redundancy state can be fed back in real time. According to the technical scheme, the method comprises the steps ofvoltage sampling and amplification, voltage comparison and signal isolation and acceleration, and real-time monitoring of the input state of the module and monitoring of the redundant state are achieved. The scheme has a series of advantages of high voltage sampling precision, fast redundancy state feedback, high safety, low cost and the like.

Description

technical field [0001] The invention relates to the field of charging stations for medium and high voltage electric vehicles, in particular to a scheme for redundant monitoring of serial modules of charging stations for medium and high voltage electric vehicles. [0002] technical background [0003] Traditional solutions often use redundant relays with auxiliary contacts, and the redundancy status of the module is judged by the status of the auxiliary contacts. This mode requires an additional set of contacts for the relay, increasing the cost of the relay and reducing the life of the relay. Moreover, after the auxiliary contact is oxidized for a long time, it is prone to poor contact, resulting in unreliable feedback signals. [0004] The medium and high voltage electric vehicle charging station adopts an input series output parallel topology scheme, which reduces the switching frequency and device withstand voltage level of a single module on the AC side, so that the AC s...

Claims

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Application Information

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IPC IPC(8): B60L53/60G01R19/165G01R31/00
CPCB60L53/60G01R31/00G01R19/16547Y02T10/70Y02T10/7072Y02T90/12
Inventor 刘玉林徐鹏飞张作超陈晨
Owner QINGDAO TOPSCOMM COMM
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