Friday, October 18, 2013

4 Problems of LED Lighting Power Supply Design

1.       The problem of electrolytic capacitor life does not match the LED life.
An important consideration of LED light is that the life of LED driving circuit should be able to be compared with the LED. Although the impact driver circuit reliability by many factors, the electrolytic capacitors have a crucial impact to the overall reliability. To extend the working life of the system, you need to targeted analysis the capacitors, and select the appropriate electrolytic capacitors.

In fact, the effective work life of the electrolytic capacitor is greatly affected by the ambient temperature and internal temperature rise. So take maintain the appropriate temperature and stress for consider in the design, can effectively extend the working life of the electrolytic capacitor,

2.       A common cause and treatment approaches for LED flashes.
Typically the human’s eye can perceive frequencies up to 70 Hz flashes of light, above this frequency is not perceived by human. Therefore, in the LED lighting applications, if the frequency of the pulse signal of the low-frequency component is lower than 70 Hz, the human eye will feel blinking. Of course, in the specific application, there are several factors that may cause the LED light flashes. For example, in off-line low power LED lighting applications, a common power supply topology is isolated flyback topology.

In addition, even use provides excellent power factor correction and support TRIAC dimming LED driver applications, it requires the electromagnetic interference (EMI) filter.      

3.       PWM dimming impact to the LED lifetime
LED has a long life, PWM dimming will not decrease the LED life expectancy. Even the LED PWM dimming help reduce the heat, in fact, can also help extend the LED life expectancy.
4.       The potential problems of use TRIAC dimmer control LED brightness

Currently TRIAC dimmer light is a popular method for dimming. TRIAC dimmer originally designed for incandescent lamps, but such as ON Semiconductor has introduced a leading provider of support TRIAC dimmable LED driver, which is ideal for LED lighting provides TRIAC dimmer.

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