Điều khiển led chiếu sáng

OIEU KHIEN

CHIEU SANG

PGS. LE VAN DOANH - THS. HA QUANG THINH

Trudng OHBK Hd Noi

LED LIGHTING GONTROL

Control plays a very important role In ensuring that LED can operate oiith optical,

energy efficient and colour features to comply luith lighting script.

UUe can assign LED delivery and control task into 3 types:

• Single LED delivery and control

• High poLuer, uuhite light LED matrix delivery and control

• Delivery and control for one band, one LED matrix follouuing given lighting script.

Oieu khien ddng vai trd rat quan trpng trong viee

dam bao LED hoat ddng vdi cac dac tfnh ve

quang, hieu qua nang iQpng, mau sac theo kjch

ban chieu sang.

Ta cd the phan nhiem vu cung cap va dieu khien LED

thanh 3 loai:

• Cung cap va dieu khien LED ddn

• Cung cap va dieu khien ma tran LED cdng sua't Idn, anh

sang trang.

• Cung cap va dieu khien cho mdt bang, mdt ma tran

LED mau theo mdt kjch ban chieu sang cho trQde.

1) CUNG CAP VA OIEU KHIEN LED:

LED anh sang trang dQpc ehe tao tQ 1 chip LED pho mau

xanh va dQpc phu bang Idp phdt pho 3 pho, tao nen anh

sang trang vdi CRI = 90. Hien nay cae chip LED thQdng cd

hieu qua nang iQpng tQ 35-60 Im/W, tQOng tQ den huynh

quang, ed the dat tdi 150 Im/W trong phdng thf nghfem.

Oe eung cap eho cac LED thQdng dung so do hinh 2,

trong dd dien ap xoay chieu dQdc chinh iQu va cung cap

cho to hpp LED.

4

Khd. nguon cung cip ^^^ p ^ED

Hinh 2: Sddo eung cap cho LED

Sd do dieu chinh dimming LED ddn dQpc cho tren

hinh 3. Oieu chinh dien ap mdt chieu tren bazo cua

tranzito T ta dieu chinh dQpc ddng dien qua LED, do do

dieu ehinh dQpc quang thdng eua nd.

Hinh 1: LED mdu trdng

JD TI; d^ng h6a ngdy nay / 3,2011

B0 bi ^ d6i

AC-DC

Li"

Hinh 3: Sd do dimming LED Hinh 4: Sa do dimming to hap LED