Ripple voltage LED to the damage

Ripple voltage LED to the damage

We all know that LED light by current to stimulate chip phosphor and shining, the voltage is a passive value. That is to measure the parameters of the LED, is the current to active parameters, voltage of passive parameters. And LED lighting in with areas, brightness demand is extremely high, so the precision of the current to extremely. Based on the above, this paper discusses the ripple voltage LED to the damage on the DuoDa.

Patch with 3528 LED strip light the rated 20 mA 3 V ~ 3.2 V for example.

Its current voltage curve:

According to most our clients parameters and 12 12 string, we would give to 18 ~ 20 ma ma so the voltage range is very narrow, the basic in 3.1 V to 3.2 V.

We according to theory 20 ma, 3.2 V to calculate words, 12 and 12 string is 38.4 V, 240 ma. Now that the ripple is 5%, the maximum floating voltage 1.92 V, single LED increased 0.16 V namely single LED for 3.36 V current 24 ma, 10% for 3.52 V current for 25 ma, 20% for 3.84 V current more than 45 ma.

The above data current everybody with ordinary instrument is not way to detect, and is completely can LED to "feel". So so high frequency voltage, current changes embody in where? The answer is LED Downlight produced extra heat!

Have the interest friend can use the same set of LED load, different output ripple voltage power to test, the LED temperatures are not the same. In addition, sometimes LED lamp just pack good, lighted lit found that LED died, these many are ripple voltage is too high, cause. So the harm I personal understanding as follows:

1, produce high temperature, lower LED life.

2, produce too much high frequency current shock, inside short time that LED failure. Directly affect the life of LED.

Above 2 o 'clock is why make LED light handsome big, one of the main reasons, as early as three years ago, almost no one discussed this and, at the same time, the technical level also obvious LED as they are now. And now the technology field, ripple more and more was the cognitive and care.

Another is to speak a little without electrolytic driver for power supply, bottleneck is ripple, if ripple with under 5%, no electrolytic capacitors in LED Spotlight field is always a dream!

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