1. what is EMC
Electromagnetic compatibility (Electromagnetic Compatibility, EMC) is a key indicator to measure the performance of an electronic device or system, reflecting its ability to adapt and coordinate in a specific electromagnetic environment. Equipment or systems with EMC characteristics can operate stably in the electromagnetic environment, but also will not produce unbearable electromagnetic interference to other equipment or systems in the same environment. EMC mainly covers two important aspects of the requirements:
Electromagnetic interference (Electromagnetic Interference, EMI): electromagnetic noise occurs when the equipment or system works, affecting the normal operation of other systems. It is divided into conduction interference (propagating through power lines, signal lines and other conductors) and radiation interference (propagating in space in the form of electromagnetic waves).
Electromagnetic immunity (Electromagnetic Susceptibility, EMS): the ability of the device or system to withstand interference from the surrounding electromagnetic environment. Even if there are electromagnetic noise, electromagnetic pulse and other interference sources, the equipment or system with good EMS capability can still operate normally, and the function is not affected.
EMC includes EMI and EMS. With electromagnetic interference EMI, EMI has electromagnetic compatibility EMC.
2. Test items in the EMC
1. Radiation emission test: evaluate the interference ability of the electromagnetic energy transmitted through space to other equipment.
2. Conduction harassment: detect the interference ability of the electromagnetic energy transmitted along the power line, control line or signal line to other equipment.
3. Electrostatic immunity: to evaluate the performance of the equipment when subjected to electrostatic discharge.
4. Radiation immunity: to evaluate the immunity of the tested equipment to space electromagnetic harassment.
5. The immunity of the electric rapid transient pulse group: verify the immunity and resistance of the equipment to the rapid transient (such as interference caused by switch operation).
6. Surge immunity: the immunity of the test equipment to the surge (impact) voltage.
7. Conductance immunity: to evaluate the sensitivity of the tested equipment to the electromagnetic energy transmitted along the power line, control line or signal line.
8. Power frequency magnetic field immunity: test the immunity of electronic and electrical products to power frequency magnetic field.
9. Power supply drop / short-time interruption: the immunity of the test equipment to voltage temporary drop, short-time interruption and voltage change.
10. Harmonics: Test whether the current at the power frequency harmonic frequency meets the requirements when working.
11, Voltage change and flicker: to ensure that the equipment will not affect its performance due to voltage fluctuations.
3. Car navigation and EMC certification
Vehicle navigation electromagnetic compatibility (EMC) certification, is the electromagnetic compatibility (Electro Magnetic Compatibility) standard, accurately applied in the field of vehicle navigation equipment. Its core essence is to ensure that the on-board navigation equipment can not only operate stably in the complex and changeable electromagnetic environment, but also will not produce unacceptable electromagnetic interference, so as to ensure the electromagnetic compatibility of the internal and surrounding environment of the vehicle.
Specifically, the main purpose of vehicle navigation EMC certification covers the following two aspects:
On the one hand, to ensure the stability of the equipment. To ensure that the on-board navigation equipment can operate normally in a complex electromagnetic environment, without failure or performance reduction due to external electromagnetic interference (EMI), so as to continuously provide reliable and accurate navigation services for the driver.
On the other hand, reduce the risk of interference. Put an end to the electromagnetic radiation generated by the on-mounted navigation equipment itself, cause interference to other electronic equipment, to maintain the normal operation of the electronic equipment inside and around the vehicle, and effectively ensure the electromagnetic compatibility of the entire vehicle system.
Through rigorous EMC certification, on-board navigation equipment can operate efficiently and stably in a complex electromagnetic environment, while avoiding negative effects on other equipment, and providing solid support for driving safety and the stable operation of the vehicle system.
4. sum up
Electromagnetic compatibility (EMC) is a key indicator to evaluate the performance of electronic devices or systems, which includes electromagnetic interference (EMI) and electromagnetic immunity (EMS). It uses radiation emission, conduction harassment and other tests to ensure that the equipment operates stably in a complex electromagnetic environment and without interference with other equipment.
On-board navigation EMC certification is of great significance to ensure the stable operation of equipment and reduce the risk of interference, and is an important guarantee for the safe and stable operation of vehicles.
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