introduction
Emerging LED lighting technologies characterized by high efficiency, energy saving, green environmental protection and long life are now accelerating, and new technologies and new solutions in applications are also emerging. LED lighting design can be combined with light source characteristics, such as light source directivity, cold light source and color changes, will become the mainstream of the lighting market. In recent years, with the continuous advancement of LED research in material selection, grain processing, and package architecture design technology, a new AC LED technology emerged as the times require, and a new idea has been promoted. Practical use of LED lighting technology.
1. Traditional LED lighting technology and its shortcomings
Conventional LEDs are typical low-voltage DC devices. They cannot be used directly under high-voltage AC (AC 100-220V) in our daily lighting. They must be stepped down by a transformer or switching power supply, and then converted to alternating current (AC) to DC ( DC), and then converted into a DC constant current source, can be used for LED light source.
Therefore, there must be a certain space in the LED lamp to place the converter, which is not conducive to the design and miniaturization of the lighting fixture. Moreover, the energy conversion of the system must have a certain amount of loss. When the DC LED is switched between AC and DC, about 15% to 30% of the power is lost, and the system efficiency is difficult to achieve more than 90%. If the LED light source can be directly driven by AC (AC), the system application scheme will be greatly simplified, and the system efficiency will easily reach 90% or more. The existence of the conversion device has caused an important factor in the high cost of the traditional LED lighting products, and has become a bottleneck restricting the life of the LED light source product, and cannot reflect the long life of the LED.
2, AC LED principle and characteristics
2.1 AC LED structure
AC LED is an LED lighting technology that can be directly plugged into 220V (or 110V) AC without the need for AC/DC conversion compared to conventional DC LEDs. The key to the AC LED light source is the special arrangement and combination technology of the LED die during packaging. At the same time, the diode characteristics of the LED PN junction are used as rectification, and multiple die are integrated on a single chip through a semiconductor fabrication process, that is, a high power single. Single power chip LED technology, and a staggered matrix arrangement process to form a bridge circuit, so that the AC current can be bi-directional to achieve illumination. The arrangement of the crystal grains is shown in Figure 1. The left picture shows the AC LED die in a staggered matrix arrangement. The right small picture shows the actual AC LED die arrangement. The AC LED die is illuminated after the AC is connected. Only two leads need to be introduced into the AC source to work.
Figure 1 AC LED die package schematic
Plastic Coated Electric Kettle
The original stainless steel double wall Electric Kettle. This kettle comes with 100% stainless steel interior. Outside made by plastic for protect your hand in case that the hot stainless steel will scald your hand. No plastic in contact with hot water. The spacious kettle has a volume of 1.8 liters which give ample space to boil tea, coffee or soups in minutes. Lets you boil a huge quantity of liquid at a time and helps save time and electricity.
· Stainless Steel Body With Plastic Outside: Ergonomic in design, the electric kettle has a sturdy handle with smart contours to make your grip a firmer one. The stainless steel finish gives a glossy feel and boasts a rust-free performance. This stainless electric kettle comes with a convenient spout so that liquid can be easily poured from it directly into a container. It avoids any spillage and thus prevents your kitchen from getting messy.
· 360 degree rotational body with separated base: Enjoy the ease and convenience of cord-free serving with this stylish stainless steel kettle. Perfect for placing on the table for gatherings or leaving on the base for worry-free hot water any time of day.
· Automatic shut off when water boils or dry: This overheat safety protection feature of the electric Kettle helps to prevent hazardous accidents. The cordless electric kettle switches off if the water inside the kettle dries up. It also saves on electricity as it uses very less power.
· Lightweight and Portable: Carry your kettle anywhere to enjoy a warm cup of coffee or tea away from your home. Kettle not only looks good but maintains a high standard in terms of durability. Lightweight and its small dimensions snugly fit in your bag. Portable and small in size, this electric kettle makes a perfect travel companion.
· Cool touch Exterior: With out cool-touch design. You`ll be able to touch the outside of the kettle even when it`s boiling. There`s no risk of getting accidentally burnt, so it`s perfect for homes with young children.
Application:
Enjoy your coffee.
Cook egg for morning.
Boil some lemon tea
Plastic Coated Electric Kettle
Plastic Coated Electric Kettle,Household Plastic Kettle,Colorful Water Kettle,Auto Shut-Off Electric Kettle
Guangzhou Taipeng Electrical Appliances Technology CO., LTD. , http://www.taipengelectric.com