Why don't LED lighting use TRIAC dimmer

LED lighting lamps and lanterns USES the TRIAC dimmer to adjust the light is not a good choice. Dr Green technology guang-hua liu, general manager of Taiwan pointed out that 'strictly, TRIAC dimmers on energy conservation and environmental protection, electric power system and general consumers will is a kind of more and more difficult to correct the bad products, recommend using other intelligent dimming technology. '

are generally introduced in support TRIAC semiconductor suppliers that move light LED drive, in fact, not because this way of dimming what's so special about the outstanding performance, just because the consumer convenience, because a lot of European and American families is widely in use today TRIAC dimmer of incandescent lamp dimming, they hope to replace incandescent bulbs with LED lamps and lanterns is directly, without the need for any modification to the existing infrastructure, which don't need to work on any rewiring.

the problem is for the LED lighting lamps and lanterns of capacitive load, TRIAC dimmer can bring five adverse effect, so it is not strictly a high-quality dimming technology.

is the first major adverse effect on TRIAC dimmer will inevitably destroy the power factor, because it adopts the cutoff wave method for dimming, especially the depth of that move light, will be very low power factor, and affect the quality of the whole grid.

the second adverse effect is TRIAC dimmer can produce serious EMI interference, because when the load is capacitive, thyristor conduction deadline will be a strong surge in the output current waveform, and the surge current will bring serious EMI interference.

the third largest adverse effect is a TRIAC can cause the lamps and lanterns that move light power conversion efficiency is low, when in-depth dimmer, efficiency will be lower than 20%.

the fourth-largest adverse effect is a TRIAC dimmer and the LED lighting lamps and lanterns is not matching, which cause the output light flashing, influence consumer experience, even can cause health problems.

the fifth-largest adverse effect is a TRIAC dimmer can bring serious THD problem, and the international standard such as EN61000 - energy 3 - 2 start demanding THD specifications.

all in all, the LED lighting lamps and lanterns USES the TRIAC dimmer to adjust the light is not a good choice. Dr Green technology guang-hua liu, general manager of Taiwan pointed out that 'strictly, TRIAC dimmers on energy conservation and environmental protection, electric power system and general consumers will is a kind of more and more difficult to correct the bad products, recommend using other intelligent dimming technology. ”

Sophy

EDN China