2012 is the first year that LEDs have entered indoor and home lighting on a large scale, and it is also the first year for civilian LEDs. As a civilian product, more stringent requirements are imposed on the performance, price and reliability of the product. On the one hand, it is required that the luminous efficiency of LEDs is continuously improved and the price is continuously lowered. On the other hand, there are many requirements for the constant current driving source of the LED. In the eyes of ordinary people, the life of LED itself is already very high, but the actual life is very low, often caused by low power supply life. The life of a power supply often depends on the life of the electrolytic capacitor. Because the life of electrolytic capacitors is generally considered to be very low. If the constant current source does not have an electrolytic capacitor at all, its lifetime can be very high. Moreover, the power factor can be improved after the electrolytic capacitor is removed. Therefore, a variety of constant current sources of electroless capacitors attract a lot of attention.
one. Simple method of electroless capacitor
It is easy to remove the electrolytic capacitor, and it can work.
Figure 1. The simplest electroless capacitor circuit
However, the life of such a circuit is shorter because it does not use a constant current measure, so when the input voltage rises or the temperature rises, the current rises rapidly, so that the LED is burned soon. Although the resistor current limiting can solve some problems, its efficiency is only 52%-73%. It is totally unacceptable.
Therefore, constant current must be applied, even the simplest constant current diode.
Figure 2. Electroless capacitor circuit and current waveform diagram with constant current diode
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