At present, in the general LED lighting market, there are differences between driver power and non isolation and isolation. The non isolation design is limited to double insulated products, such as light bulbs and other alternative products, in which LED and products are integrated and sealed in non conductive plastics, so the end users are not in danger of electric shock. II products are isolated and relatively expensive, but users can access LED and output terminals (usually used in LED lighting and street lighting). This product is essential.
The isolation transformer or electric isolation LED drive power means that LED can touch directly without touching the electricity. Although there is no isolation transformer, although some mechanical insulation can still be achieved by using the protective shell, LED can not be directly contacted at work.
Insulating light bulbs will play a major role in the future
The physical design determines that the driver is isolated or not isolated. Safety rules usually require two separate isolation layers. Designers can choose two physical barriers, such as plastic diffusion and glass cover and non isolated power supply. If the physical isolation cost is too high, the machine is difficult or the absorption of too much light, it is necessary to solve the electrical isolation problem in the power supply.
Based on the same power, isolated power is usually larger than non isolated power. Lighting designers must do a lot of cost and design optimization when designing each product. Because for different applications, different designers always have different views whether they use insulation transformer isolation or protective shell lampshade isolation.
Usually, they will be analyzed in terms of cost and manufacturing process, efficiency and volume, insulation reliability and safety requirements. The driver and transformer cost much higher, but they can make the corresponding LED lamp more practical, and meet the need of the accidental contact between the end users and LED. When the incandescent lamp housing is easily damaged, the ordinary E27 bulb can be replaced with LED lamp.
In addition, in industrial areas or office equipment applications, lamps and lanterns do not need to approach end-users, such as shopping malls and street lighting. At this point, LED lamps need to isolate transformers.
In order to ensure the safety of the end-users, we will consider the reliability of insulation and isolation. As a complete product, the surface parts to be visited must be quarantined so as not to be subjected to electric shocks. From the point of view of the whole system, isolation is inevitable, but in fact, it is only the difference of location. Some designers use isolation transformers to design and simplify the design of heat dissipation and lampshade isolation LED drivers and non isolated LED drivers 3.
If the driving design is not isolated, the reliable insulation requirements must be considered for such structures as lamp housing. Therefore, as an electrical driver, isolation and non isolation solutions always exist at the same time.
The main challenge facing China's LED driven power suppliers is to find a low-cost AC / DC driver to meet the more stringent power factor and low cost power system performance.
The isolation of the LED drive power and transformer will be the advantage and disadvantage of the main isolation and non isolated LED drive 1 Isolation and non isolated LED drive power options for the mainstream isolated LED drive. Insiders believe that the II class will become the mainstream because it simplifies the LED cooling problem. I class or II class system depends on grounding system, which is closely related to the installation site in most cases. The II class is more common, requiring two level or enhanced isolation, requiring magnetic transformer winding, insulation tape and physical isolation. Class I systems require grounding enclosure and / or mechanical barriers, but no II class system is needed at this time.
There are several trends that are driving the development of LED lighting market. First, the controversial improvement of high brightness LED efficiency and the controversy of high efficiency, high reliability and constant current LED driving power are discussed. Secondly, the global legislation to ban incandescent lighting (due to inefficient) phase out CFL energy saving lamps (if damaged, will be removed from the harmful environment of mercury). Combined with these factors, LED lighting has become a long-term positive trend. Of course, low system cost (including LED, LED thermal management system and driver) has been widely used in the LED general lighting of consumers.