With the development and advancement of electronic information technology, connectors become the key components of current or signal connection. Although they are small in size, simple in function and structure, but many types and large quantities, most engineers often face such a dilemma: ◠Confused in the design of problems and treatments that need to be considered in addition to functions. ◠Reasonable selection of product routine experimental items, analysis of test results and response methods are not well understood. ◠It is difficult to give a targeted solution to the failure analysis that occurs in the application of the product. In fact, for the difficulties and key technologies of connectors, reliability issues cannot be ignored, including reliability design, evaluation and testing. For example, do you think that a good quality product means high reliability? In the connector product, do you think quality is important or reliability is important? Today, let us take a look at the wonderful sharing of Professor Xu Liangjun from Beijing University of Posts and Telecommunications in the "Discussion on the Complexity and Reliability of Electrical Connector Technology". Guest speaker profile: Xu Liangjun, Professor, Associate Dean, School of Automation , Beijing University of Posts and Telecommunications Research direction: electrical contact theory and reliability; electromechanical system dynamic analysis, fault diagnosis, computer simulation; vibration experiment and detection technology; finite element application in engineering; electromechanical component design technology. He has completed or undertaken many scientific research tasks such as "Electromechanical System Computer Simulation", "Study on Seismic Performance of Program-Controlled Switches", "On-line Performance Testing and Research of Power Connectors", "Electrical Contact Failure Analysis". Maintain extensive cooperation with international counterparts. In the past few years, he has visited Poland, the United States, Germany, Canada and other countries for academic exchanges, scientific research cooperation, and participation in international academic conferences. He has repeatedly invited and received foreign scholars' visits. content 1. The complexity of the connector stems from a lack of overall understanding and understanding. 2, the reasonable division of the connector from the technical is an effective means to master the connector technology 3, 90% of the connector technical requirements are the same or the same 4, the reliability design of the connector View 1. The difficulty and key technology of the connector lies in the reliability design, including reliability design, evaluation and testing. 2, connector reliability research, evaluation, design complexity, can list hundreds of factors, but not all the factors used in all occasions. 3. Research on the reliability of materials, working conditions and environment should be focused on. Expertise in mastering connectors Connectors as a product require two types of technology: design technology and manufacturing technology. The manufacturing technology is not unique to the connector, but is part of all the manufacturing techniques required for connector manufacturing. The connector's own expertise and technology are applied to the connector design, so mastering the connector's expertise is a must for the design engineer. An effective means of mastering connector technology New energy vehicle connectors, rail transit connectors, aerospace connectors, etc., which we commonly see, are divided from a market perspective. From a technical point of view, connectors should be divided into two broad categories: power connectors that transmit large currents and high voltages, and signal connectors that transmit small currents and low voltages. This is based on the different concerns of the connectors in their design. The design difficulty of the power connector is mainly to solve the heat generation problem, and the main difficulty of the signal connector design is stability and signal integrity (high frequency and high speed). From the design goal, the connector can be divided into functional design and reliability design. The so-called functional design, if able to pass 100A current, can be distorted by the 40G signal. Reliability design is to ensure how long this feature can last and what its retention rate is. For connectors, reliability design is much more difficult and complicated. Mainly because of various factors related to work load and environment, and randomness. Therefore, the technical division of the connector is an effective means to master the connector technology. The basic rules of connector technology can be combed and mastered in a short period of time, but more research and improvement should be put into the reliability design. Questions about connector reliability design 1. Is the quality and reliability the same in the connector product? In the field of connectors, reliability and quality are different. Reliability is a design metric, and quality is a measure of whether a product's manufacturing level meets design requirements. 2. What is the main reliability problem of the connector? Connector reliability issues are primarily: reliability design and reliability assessment. Both have great difficulty, the latter being largely the basis of the former. 3. What is the situation of domestic connector reliability research? 4. How to analyze the fault from the perspective of reliability in view of the recent ablation of brand mobile phones? The idea of ​​analysis should be to first create a tree diagram of the influencing factors, list the possible factors of all influences, then find out the relationship, arrange them in order of importance, and then find out the mechanism according to the relationship diagram, and finally determine the method of testing and evaluation. And program. The specific analysis is: For the USB ablation phenomenon, the five influencing factors with the highest probability of occurrence among the 16 influencing factors are: temperature, pollution, plugging and wear, high temperature, voltage. Through the laboratory simulation analysis of relevant influencing factors, the order of the factors of USB ablation failure under temperature and humidity is: pollution, voltage, insertion and removal times. This demonstrates the possibility of ablation and the conditions that arise. It is worth noting that the pollution analysis is based on a corrosion mechanism, but it is not certain that its ablation is the mechanism. It cannot be said that the failure is caused only by this mechanism. 5. How to measure the reliability of the connector Is the design reasonable? At present, there is a widespread phenomenon in the industry: the indicators exhibited by the connector products are qualified, but the product design is not necessarily up to standard. As we all know, the international general rule is that the reasonable contact pressure drop should be around 10mV, and the maximum should not exceed 20mV. This criterion is essentially to control the temperature rise, and the purpose of controlling the temperature rise is to ensure that the alpha spot does not melt when current flows through the contact, thereby ensuring the working life of the contact. Previously, I found that the indicators of a connector far exceeded the standard in making product improvements for customers. According to the guidelines, a reasonable temperature is about 53 ° C, and the temperature rise of the contact is 2-3 ° C higher than the conductor temperature. However, the temperature rise of this connector reached 10 ° C, obviously not set according to the specifications. Since the temperature on the contacts is difficult to measure, we use the contact drop to measure the temperature based on the heat of fusion, which is related to the current resistance. This finds an indirect measurement method. Professor Xu’s words It is believed that quite a few companies do not have the above settings in terms of connector contacts. It is OK to measure the entire temperature. However, it is unclear whether this contact can maintain long-term work. This problem will not be apparent at the time. At present, many years of research and experience abroad have given conclusions and practices. As long as we understand the mastery, we can improve the current product reliability level. About Guangdong Connector Association: If you want to get the same opportunities as your experts to develop your abilities and strengths, you are welcome to join the Guangdong Connector Association as a member. Future connections are proud of you! Media Converter And Optical Fiber Switch Media Converter Optical Fiber Switch fiber optic switcher Media Converter,Optical Fiber Switch,Fiber Optic Switcher Chinasky Electronics Co., Ltd. , https://www.chinacctvproducts.com
At present, domestic reliability research mainly has problems such as simulation experiments and in-depth analysis. And the cost of reliability research is high. It is recommended to focus on the relationship between materials and working conditions and environment, so that the results can be applied to more connector designs to balance the input-output ratio, not specific. A connector is used for system research.
The Guangdong Connector Association Secretariat is located in Songshan Lake, Guangdong Province. It aims to form China's leading connected manufacturing technology and solution industry chain community, promotes application-side innovation closely related to connectors, focuses on the core strength of the industry, and is committed to the international top. Connect the technology industrialization process and build a new ecosystem of China's connector industry chain!