The structure of the LED bulbs

An LED lamp contains a to a dozen or more LED chips, they are usually in series. Each chip luminescence brightness by is determined by the current. Because use series connection mode, the light bulb inside each LED chip will automatically through the same current, but each a different voltage on a chip. Usually for 3 LED the forward voltage drop. 4 v, but can be in 2. 8 v to 4. 2 v. Can categorize LED to limit the amplitude of voltage changes, but this will increase the cost, and the forward voltage drop will change with the temperature and time. To provide a consistent light output, LED lights must be driven by the strict rules of high efficiency constant current power supply. As a substitute for incandescent bulb LED lights, the power must be integrated within the lamp shell. Typical integration LED lights including driving circuit, LED cluster, and at the same time for the driver and the LED chip to provide mechanical protection and thermal shell. The LED driver is very strict requirements. It must be of high efficiency and energy saving, specifications must meet stringent EMI and power factor, and can be safely tolerate various fault conditions. One of * for difficult requirement is to have dimmer function. Due to the nature of the LED and designed solely for incandescent lamp dimming controller between mismatch, so easily lead to poor performance. Problems may be slow to start, flicker, uneven illumination, or flickers when adjusting the brightness. In addition, there are various unit performance inconsistency and leds emit audible noise and other issues. These negative conditions are often triggered by mistake or premature shutoff, improper control of controller and the LED current caused by factors such as joint.
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