Explain in detail the strict quality standards for component manufacturing and testing formulated by the automobile industry

by:MOSO     2019-12-20

Today's automobile design of power subsystem is a rather complicated task. Why is it complicated? Because modern cars, whether powered by engines or Motors, have more complex and diverse power requirements than ever before, cars are usually equipped with up to 100 programmable electronic control units (ECU) To achieve comprehensive and effective control of the engine and powertrain, to the infotainment system, communications, and safety and assisted driving systems. With the rapid development of automobile technology in the field of more complex auxiliary driving systems and automatic driving, the complexity of its design will only increase.

Therefore, it is not surprising that the automobile industry has replaced the computer and communication industry as the fastest growing market for power electronic systems. With the increasing complexity of on-board power electronic components and the expansion of functional control range, the following design factors become crucial:

stability and reliability: power Electronic components must be able to withstand the harsh tests of daily use and withstand extreme temperature and humidity environments.

service life: consumers want their cars to have a longer service life of 10 years or even longer, which is much longer than the life of electronic devices such as mobile phones.

immunity: electronic components and systems in automobiles must be able to coexist with each other without interfering with each other.

in order to ensure that electronic components will not fail after being embedded in the electronic system, the automobile industry has formulated strict quality standards for component manufacturing and testing. Only components that meet such standards can be used in automobiles.

major automobile certification standards

AEC-Q100 certification-AEC- Q100 is a stress testing method for integrated circuits based on fault mechanism. Automotive Electronics Association (AEC) Based in the United States, it was originally jointly founded by three major automobile manufacturers to establish common component certification and quality system standards. AEC- Q100 is an industry standard covering the new product import process and product change certification process.

IEC60664-1- This standard specifies different electrical gap size requirements and is designed to help select the appropriate electrical gap so that it can withstand the maximum peak voltage on the air gap between the two components at different voltages. According to Pasing's law, the performance of the maximum voltage value of air tolerance is related to air pressure. For high altitude applications, the effect related to size parameters such as electrical clearance and creepage distance is crucial because the air pressure decreases as the altitude increases. Under special environmental parameters, the electric field stress through solid insulation depends on the structure of the device and can be verified by the test procedure according to the applicable product standard of only 2000 application altitude. If the altitude exceeds 2000, the specified parameters Ue, Ui, Uimp and Ie must be reevaluated. For example, when operating at an altitude of 5000 or more and 6000 or less, the correction factor is 1. 48.

VDE0884-10- This standard focuses on the maximum transient voltage, that is, the voltage that the device can withstand under various test conditions without insulation breakdown. For example, VIOTM was approved by IEC 60747-5-5 and VDE0884- 10 is defined as the peak transient voltage that an insulator can withstand without breakdown. This standard is based on partial discharge test rather than voltage breakdown and is based on insulation withstand voltage.

plastic sealing material of CTI600-Relative leakage trace Index (CTI for short)Used to measure electrical breakdown of insulating materials (Marking)Characteristics. Trace refers to the electrical breakdown on the surface of the insulating material, and the heat generated makes the surface material carbonized. Carbonized substances have stronger conductivity than the original insulator, which will generate more current, more heat, and even eventually lead to complete failure. The minimum required creepage distance on the surface of insulating material between conductive parts in the equipment, especially between high-voltage parts and user-accessible parts, depends on the CTI value of the insulator.

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