Development trend of LED: insulated bulb will become the mainstream in the future

At present, in the general LED lighting market, there is no separation design and isolation of the driving power supply. The non isolation design is limited to double insulation products, such as the replacement of light bulbs, in which the LED and the entire product are integrated and sealed in non-conductive plastic, so that the end user does not have any risk of electric shock. Two products are isolated, the price is relatively expensive, but access to the LED and the output terminal where users can (usually in the application of LED lighting and street lighting conditions), this product is essential.

With isolation transformer or electrical isolation of the LED power supply means that the LED can be directly connected with the hand without shock. Without the LED drive power isolation transformer with protective shell can be achieved while some mechanical insulation, but this time the LED at work and not direct contact. Insulation bulbs in the future will be the mainstream of physical design determines whether the drive is isolated or non isolated.

Security rules usually require the use of two separate layers. Designers can choose two kinds of physical isolation layer, namely, plastic and glass cover, and the use of non isolated power supply. If the physical isolation costs are too high, there are mechanical difficulties or absorb too much light, you must solve the problem of electrical isolation in the power supply. The isolated power supply is usually larger than the non isolated power supply at the same power level.

Development trend of LED: insulated bulb will become the mainstream in the future

The lighting designer has to do a lot of cost and design optimization for each product they design. Due to the application of different applications, is the use of isolated insulation transformer or isolation of the protective shell, the designer at different angles will always have different views.

Typically, they will be analyzed in a variety of ways, such as cost and manufacturing processes, efficiency and volume, insulation reliability and safety requirements, etc.. With the high cost of driving the transformer, but also the corresponding LED lamps become more practical, to meet the needs of end users accidentally contact LED. When the incandescent glass shell is easily damaged, a E27 model of ordinary bulbs can be replaced with LED lights.

In addition, in the industrial areas or office equipment applications do not need to touch the end user, such as street lights and shopping malls lighting, then the LED lights do need isolation transformer. As a product that allows the end user to safely use, the reliability of insulation and isolation must be considered. As a complete product, the user can contact the surface of the product must be isolated, can not make an electric shock. From the entire system of products, isolation is inevitable, the difference is only set the isolation of different locations. Some designers use isolated transformer design, so they can simplify the design of heat dissipation and lampshade.

If you use non isolated driver design, the lights on the shell structure of the insulation requirements must be considered reliable. As a result of power supply, isolation and non isolation of the program has been the same. The main challenge for LED drivers in China is to find low-cost AC/DC drivers to meet the more stringent power factor and efficiency performance in low-cost power systems.

In the future, the use of high quality, high reliability power supply in space limited and difficult to heat system (such as LED) will no longer be free. However, it is very difficult to prove that the quality is high before the end user has used a lot of bulbs for about 10000 hours.