The advantages of small LED size, low energy consumption, long life, environmental protection, and low heat have led to its rapid development and its wide application in various fields. Among them, long life is a very important advantage of LED. To ensure this advantage of LEDs, developers must ensure good EMC and reliability of LED systems. This article analyzes how to detect the EMC and reliability of LED systems based on an example.
1. Power system compatibility
Providing electrical power to LEDs or LED arrays is an important issue that must be considered when designing and implementing LED lighting devices and systems, as well as ensuring reliable end-user operation and compatibility with power supply systems. The power system includes various electrical infrastructure and utility grid utilities in people's daily lives.
Studies have shown that under normal circumstances, there are usually unreasonable wiring or grounding errors in power supplies that users have and operate. When general external power supply facilities are subject to general current interference, unreasonable or even incorrect wiring or grounding treatment will increase the degree of interference, increase the probability of damage to the user's electronic lighting device, and cause permanent damage to the device in severe cases. LED lighting devices and systems must have the ability to function properly in everyday electrical environments. Typical daily electrical environments include indoor and outdoor lighting, lighting inside and outside buildings such as shopping malls and factories, and LED Street Lights and searchlights on municipal poles.
2. Reliability of LED lighting devices and systems
First of all, what is reliability? It is defined as the ability of the product to perform the specified function within the specified conditions and within the specified time. With the development of science and technology, the design of modern operating machines, engineering equipment, vehicles and various types of exploration instruments is becoming more and more complex, and the functions are becoming more and more perfect. Therefore, the performance of these electronic and electrical products is becoming more and more serious. obvious. At the same time, the reliability of these machines and equipment has gradually received widespread attention, and this reliability is called system reliability. The reliability requirement is higher as the system becomes more complex. If the reliability does not meet the requirements of the system index, the greater the possibility of system failure, the greater the loss. These losses include economic, credibility, and even catastrophic consequences of life safety or more serious. For example, if the brake system of the car is unreliable or the work is wrong, the brake may be malfunctioning, which may cause significant loss or even danger to life. In the case of a major voting election, if the computer system is used, if the system fails, the statistical result will be disrupted. The consequences will be unimaginable. Therefore, it can be said that the introduction of the concept of system reliability has great significance for electronic products.
To improve the reliability of the system, on the one hand, it is necessary to improve the reliability of each component that constitutes the system. For example, to improve the reliability of the vehicle brake, firstly, the reliability of the brake position and control system should be improved. On the other hand, it is necessary to improve the reliability of the system against misoperation.
The root of improving system reliability lies in the design of the system. In order to make the components of the system work under normal conditions, there is no phenomenon such as overload and overload, and there must be a certain margin. It is also possible to design an alternative solution that will allow the system to function even if individual components or equipment fail. Of course, the design of the alternative solution may increase the complexity and cost of the system, but if the design is reasonable, it is worthwhile to have a good cost performance in terms of cost increase and system reliability improvement.
3. LED lighting device and system compatibility
The compatibility problem of electronic products is mainly electromagnetic compatibility (EMC), which is defined as the coexistence state of devices, systems, and subsystems that can perform their respective functions together in a common electromagnetic environment. That is, the device, system, and subsystem are not subject to the electromagnetic emission caused by other devices in the same electromagnetic environment, or suffer from impermissible performance degradation, and will not cause other devices, systems, and subsystems in the same electromagnetic environment to be electromagnetic. The launch causes or suffers from impermissible performance degradation. Electromagnetic compatibility includes two aspects: electromagnetic interference (EMI) and electromagnetic resistance (EMS).
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