Relay anti-adhesion circuit

A relay and anti-adhesion technology, applied in relays, circuits, electrical components, etc., can solve problems such as lack of reliability, and achieve the effects of improved reliability, simple circuit and low cost

Active Publication Date: 2014-04-09
HUIZHOU EPOWER ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Only use unilateral processing measures, which lacks reliability

Method used

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  • Relay anti-adhesion circuit

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Embodiment Construction

[0014] In order to allow those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described below in conjunction with the accompanying drawings.

[0015] Such as figure 1 As shown, the relay anti-sticking circuit described in this embodiment is applied to the control circuit of the battery management system, including the first relay 1 and the second relay 2 with two-way contacts, and the first relay 1 is the battery management system The main positive relay in the control circuit, and the second relay 2 is the main negative relay of the battery management system control circuit. The two contacts of the two relays are controlled at the same time, and the state output of the second contact is detected to reflect the adhesion status signal of the first contact connected to the total positive and total negative lines in the battery management system.

[0016] The first NOR gate L1, its input end is resp...

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Abstract

The invention provides a relay anti-adhesion circuit comprising a first relay and a second relay which comprise two-path contact points, a first XNOR gate and a second XNOR gate. The first-path contact points of the two relays are both connected in an application circuit. The second-path contact points and the first-path contact points are simultaneously controlled to act so that a signal reflecting the adhesion state of the first-path contact points is outputted. The input end of the first XNOR gate is respectively connected with a control signal of the first relay and the adhesion state signal of the first relay, and the output end is connected with a control circuit of the second relay. The input end of the second XNOR gate is respectively connected with the control signal of the second relay and the adhesion state signal of the second relay, and the output end is connected with the control circuit of the first relay. When an adhesion fault occurs in the relay with passing of high current, the situation can be timely reported and connection of the other relay can be cut off so that safety performance and reliability of an electric vehicle can be greatly enhanced, functions can be realized only by using a few commonly used components and parts, and thus the relay anti-adhesion circuit is low in cost.

Description

technical field [0001] The invention relates to an electric vehicle battery management system, in particular to a relay anti-adhesion circuit. Background technique [0002] At present, the battery capacity of electric vehicles is getting larger and higher, and the voltage is getting higher and higher. Using relays to control the on-off between the power battery and the motor often encounters the problem of relay adhesion, which leads to the continuous disconnection of the relay and brings unpredictable dangers. [0003] Most of the existing battery management systems use the method of separate control of the positive and negative poles of the battery, that is, the connection between the positive pole and the negative pole and the motor is controlled by a relay respectively, and the two relays are respectively controlled by two ports of the ECU. In addition, two relays need to be connected. detection port. The relay sticking status is judged by the software and then processe...

Claims

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Application Information

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IPC IPC(8): H01H47/02
Inventor 刘飞文锋阮旭松王占国刘健羽
Owner HUIZHOU EPOWER ELECTRONICS
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