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EMC testing Contents and Current Situation of Automotive Electronic products
2024.10.12 00:00:00
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Automotive electronic products can be classified into five major categories based on their applications: Automotive electronics (Power, Can, lin, etc.), in-car entertainment (radio, DVD, USB flash drive, SD card), in-car navigation (interactive navigation, map update, route planning), in-car information management (driving data, fault detection, tire pressure and oil level), vehicle control (remote door opening and closing, remote starting, assisted driving)
Analysis of the sudden change curve of ESD voltage in automotive electronics
ISO7637-2 pulse analysis is only for the testing of power cords, while ISO10605 mainly tests all products, including all power ports and signal ports. "6VCrank" is caused by starting a car and requires the engine to reduce the power supply voltage to 6V. The "87VLoaddump" load disconnection is caused by the disconnection of the battery from the generator when the alternator generates charging current. The "+150-220V spikes" are the voltages necessary for the ignition system to ignite the gasoline mixture. The frequency of this spike depends on the engine speed and the number of cylinders. The result of "24VJumpstart" is that the temporary application overvoltage exceeds the battery voltage, and the circuit power supply may suffer from temporary overvoltage. "Reversebattery" is the result of a battery being flipped over. "25KVESDSpikes" are the result of electrostatic discharge (ESD).
Thoughts on ESD (Electrostatic Discharge) and Surge Circuit Protection for Automotive electronics
In automotive electronics, all electronic devices are threatened by static electricity (ESD) and load crashes. These overvoltage issues can cause permanent damage to chip circuits, so overvoltage protection is indispensable. At the same time, meeting these requirements is also part of the ISO7637 standard.In this regard, ASIM automotive-grade TVS diodes meet the above requirements, ensuring the safety and reliability of automotive electronic devices. In fact, the application of TVS diodes has become quite common. Long service life and high reliability in operation are essential features that automotive-grade TVS diodes must possess, such as passing the AEC-Q101 certification to meet the operational requirements of the entire vehicle.
Take the ESD protection solution for automotive electronics as an example. Due to the extensive application of buttons and USB interfaces, the testing standards have been continuously upgraded. The electrical protection requirements of the ISO10605 standard have even reached 25KV. Without a reliable circuit protection device, this requirement cannot be met.
ASIM semiconductor protection arrays can meet the ESD testing requirements of the entire circuit. For instance, the ESD5D003TA and ESD5D005TA can achieve a test index of 30KV, and each circuit is connected in parallel with one of its protective devices to safeguard automotive electronics.
In addition, in terms of data line protection, the extensive application of CAN buses in automobiles connects all electronic components for data exchange. For the protection of CAN chips, ASIM dedicated protection devices offer an ideal form of protection. They not only meet the requirements of ESD protection but also some surge protection requirements. For instance, the typical application circuits of the SMA04J05V series offer dual protection of common mode and differential mode.
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