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High-voltage negative electrode relay adhesion detection circuit and detection method thereof

A technology for detecting circuits and relays, applied in circuit breaker testing, battery/battery traction, electric vehicle charging technology, etc. Applicable performance and improved communication efficiency

Pending Publication Date: 2019-01-11
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned scheme can detect relay sticking to a certain extent, but this scheme still has the following defects at least: first, the amount of logic operation is large, which affects the real-time performance of abnormal feedback; Poor; third, the detection cost is high

Method used

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  • High-voltage negative electrode relay adhesion detection circuit and detection method thereof
  • High-voltage negative electrode relay adhesion detection circuit and detection method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Such as Figure 1~2 As shown, a high-voltage negative relay adhesion detection circuit includes a battery pack 1, a positive relay 2 and a negative relay 3 respectively connected to the total positive pole and the total negative pole of the battery pack 1, and also includes a connection to the output terminals of the total positive pole and the negative pole relay 3. The voltage dividing circuit 4, the A / D conversion unit 5 electrically connected to the voltage dividing circuit 4, the isolation communication unit 6 electrically connected to the A / D conversion unit 5, and the micro control unit 7 electrically connected to the isolation communication unit 6, respectively The voltage circuit 4 includes a first resistance unit and a second resistance unit connected in series, one end of the first resistance unit is connected to the total positive pole, the second resistance unit is connected to the output end of the negative relay 3, and the first resistance unit and the sec...

Embodiment 2

[0041] Such as Figure 1~2 As shown, a detection method for high-voltage negative relay adhesion includes the following steps:

[0042] 1) The A / D conversion unit 5 collects the voltage Uab between the voltage collection point a and the sampling reference ground b of the electric vehicle during power-off, and then converts the analog signal into a digital signal and sends it to the isolation communication unit 6;

[0043] 2) The isolation communication unit 6 isolates the received signal and sends it to the micro control unit 7;

[0044] 3) The micro-control unit 7 judges whether the negative relay 3 is stuck according to the voltage Uab between the voltage collection point a and the sampling reference ground b during the power-off process. If the negative relay 3 is stuck, the micro-control unit 7 can pass the alarm device Send reminders or warnings to operators or maintenance personnel.

[0045] The method for judging the adhesion of the negative relay in step 3) includes ...

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Abstract

The invention discloses a high-voltage negative relay adhesion detection circuit and a detection method thereof, which comprises a battery pack, a positive relay and a negative relay connected to thetotal positive pole and the total negative pole of the battery pack, and further comprises a voltage division circuit connected with the total positive pole and the output end of the negative relay, an A / D conversion unit electrically connected with the voltage division circuit, an isolation communication unit electrically connected with the A / D conversion unit, and a micro control unit electrically connected with the isolation communication unit, the voltage division circuit comprises a first resistor unit and a second resistor unit connected in series, one end of the first resistor unit is connected to the total positive pole, a voltage acquisition point is arranged between the first resistor unit and the second resistor unit, the voltage acquisition point is electrically connected withthe input end of the A / D conversion unit, a sampling reference ground is arranged between the output end of the second resistor unit and the negative relay. The high-voltage negative relay adhesion detection circuit can find whether the negative relay is connected or not, and improve the reliability of the circuit, in addition, the invention further discloses a detection method of the high-voltagenegative relay adhesion detection circuit.

Description

technical field [0001] The invention belongs to the technical field of relay detection, and in particular relates to a detection circuit and a detection method for high-voltage negative relay adhesion. Background technique [0002] Today, in the high-voltage system of electric vehicles, the status detection of relays is an important technology to realize the safe power-on and power-off of electric vehicles. There are many high-voltage components in electric vehicles. In the actual operation process, when the load of the components fails due to short circuit, or the control sequence design of the vehicle is unreasonable, a large current will be generated on the power line and the relay will stick. For safety reasons, in electric vehicles During power-on and power-off, the state of the relay must be detected. [0003] Among them, the Chinese patent literature discloses a power battery main circuit relay fault detection circuit and its detection method for electric vehicles (p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327B60L50/50
CPCG01R31/3275Y02T90/16Y02T10/70
Inventor 钟少斌刘晨南
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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