The characteristics and principles of AC drive-free LED

Emerging LED lighting technology is developing rapidly. It is popular in the market for its characteristics of high efficiency, energy saving, environmental protection, and long life. New technologies and new solutions in the application are also constantly emerging. LED lighting design can be combined with light source characteristics, such as LED Light module source directivity, cold light source and color change, etc., and will surely become the mainstream of the lighting market. In recent years, with the continuous progress of LED research in material selection, packaging architecture design technology, etc., a new AC LED Light module-emitting diode AC drive-free LED technology has emerged. A new idea has promoted the development of LED lighting technology. Practical.

AC drive-free LED is an LED lighting technology that can be directly plugged into 220V (or 110V) AC power compared to traditional DCLEDs without AC/DC conversion. The key to AC drive-free LED technology is the special arrangement and combination technology of LED dies during packaging. At the same time, the diode characteristics of the LEDPN junction are used as rectifiers, and multiple dies are integrated on a single chip through a semiconductor manufacturing process, that is, a high-power single chip. Die technology, and adopts a staggered matrix arrangement process to form a bridge circuit, so that the AC current can be bidirectionally conducted to achieve light emission. The arrangement of the dies is a schematic diagram of the AC drive-free LED dies using a staggered matrix arrangement. The actual AC drive-free LED dies are arranged in photos. The AC drive-free LED dies emit light after being connected to the AC, so only two leads are needed. It can work with light when the AC source is imported.

The working principle of AC drive-free LED LED Light module source. The LED micro-crystals are arranged in a staggered matrix to form 5 bridge arms, which are similar to a rectifier bridge. Both ends of the rectifier bridge are connected to AC sources, and the other ends are connected. A group of LED dies, the positive half of the AC flows along the solid line, the LED dies of 3 bridge arms emit light, the negative half of the cycle flows along the dotted line, and the LED dies of 3 bridge arms emit light, and the LEDs on the four bridge arms. The dies emit light in turns, the LED dies on the opposite bridge arms emit light at the same time, and the LED dies on the middle bridge arms keep emitting light due to sharing.

The AC drive-free LED is small in size and is generally used for small industrial and civil indicator lights; the advantages of high voltage and low current conduction overcome the problem of relying on the power supply connection caused by high line loss when using DCLED; and bidirectional conduction , Blue and green LEDs have no electrostatic breakdown ESD problem; the use of micro-crystal technology to greatly improve the luminous efficiency; due to the improvement of power factor and low current control, it is a practical new technology for the general lighting industry and the LCD backlight panel industry.

At present, AC drive-free LEDs are constantly being updated and improved in terms of luminous brightness and power, but the characteristics of easy application, low cost and high efficiency of AC drive-free LEDs have gradually emerged. The technical certification of AC drive-free LED is developing by leaps and bounds. It is believed that in the near future, high-brightness, high-power, low-cost products will be available in large numbers, and it will illuminate the world with greener and more environmentally friendly lighting.