Talking about the difference between the LED drive power isolated and non-isolated

Currently in the general LED lighting market, there is a non-isolated led drive power and isolation led drive power points. Non-isolated design is limited to double insulation products, alternative products such as light bulbs, including LED and the product are integrated and sealed in a non-conductive plastic, so the end user does not have any risk of electric shock. Two products are isolated, the price is relatively expensive, but the user can access to the LED and output wiring place (usually in the case of LED lighting and street lighting applications), this product is essential. With isolation transformer or electrical isolation LED driver power supply means that the LED can be directly touched by hand without electric shock. Without isolation transformer LED drive power, though still can make use of protective shell to achieve some mechanical insulation, but this time the LED can not be in direct contact with at work.

Insulation bulb in the future will become a mainstream physical design determines the drive is isolated or non-isolated. Safety rules often require the use of two independent isolation layer. Designers can choose between two physical barrier, ie plastic diffusers and glass cover, and use non-isolated power. If the physical isolation cost is too high, there is no mechanical difficulties or absorb too much light, it is necessary to solve the problem of electrical isolation in the power supply. Isolated power supply is usually better than the same power level of non-isolated power larger. Lighting designer must be a lot of cost and design optimization work they design each product. Because for different applications, is the use of isolated or insulated transformer isolation using protective shell lampshade, the designer in a different point of view will always be different opinions. Typically, they will go to analysis from various aspects, such as cost and manufacturing processes, efficiency and volume, insulation reliability and safety regulations, and so on. The higher cost of driving a transformer, but also make corresponding LED lamps become more practical, able to meet the needs of end-users incidental contact with the LED. When the incandescent lamp glass envelope can easily be damaged, a common type E27 bulb can be replaced become the LED lights.

Further, in the industrial area or office equipment applications lamps do not need access to end-users, such as shopping malls and street lighting, when the LED lights do need isolation transformer. As an end-user to allow safe use of the product, we will consider the reliability of insulation and isolation. As a complete product, users have access to the product surface portion must go through quarantine, people can not get an electric shock. From the product in terms of the whole system, isolation is inevitable, but the difference between isolation set different positions. Some designers use isolation transformer design, so they can be simplified thermal and lampshade design. If the driving design non-isolated, in the lamp housing and other structures must be considered reliable insulation requirements. Therefore, as a power drive, isolated and non-isolated solutions always exist. The main challenge China LED driver power supply manufacturers may face is to find a low cost AC / DC drives to meet more stringent achieve power factor and efficiency in the low-cost power system performance. The future, the use of high quality, high reliability of power supply in space-constrained and there are difficulties in the cooling system (such as LED lamps) will no longer be free. However, many end users to use a paragraph before the lamp life of 10,000 hours, in order to prove its high quality is pretty difficult thing.

Transformer-based isolation type LED drive power will be the mainstream isolated and non-isolated LED driver power supply options have their advantages and disadvantages. In our view, ClassII will be the mainstream, because it simplifies the LED heat problem. ClassI or II system relies grounding system, in most cases, is closely related with the installation site. ClassII more common, which requires a two-stage or enhanced isolation, that require magnetic transformer windings, insulation tape, and physical isolation. ClassI system requires a grounded enclosure and (or) mechanical barrier, but this time ClassII system unnecessary. There are several trends are driving the development of LED lighting market. First, continue to improve the efficiency of high-brightness LED high efficiency and very high reliability, constant current LED driver power supply continue to emerge, followed by global legislation to ban incandescent lighting (due to their low efficiency) and the phasing out of the CFL energy-saving lamps (if the break then it will be out of environmentally harmful mercury). These factors combine to make LED lighting has become a positive long-term trends. Of course, low system cost (including LED, LED thermal management systems and drive) is always the driving force is widely used in consumer LED general lighting.

In fact, in many LED lighting products, failure is a common phenomenon, because most of the power failure, rather than failure of the LED. On the design level, which means that OEM system thermal design must become an expert. LED with high efficiency, but they also generate more heat conductive than incandescent or energy-saving lamps. Since many LED lighting applications enclosed in a small space, it is difficult to dissipate heat ventilation approach. Without careful thermal design, LED and power driver circuit is very easy because of the high temperature degradation or permanent failure.