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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