1. Lightgreen ConceptLightgreenConcept13Mar2012
Lightgreen Japan
Business Proposal
AC Direct LED Driver [LGC-P1]
Chemical Condenser-less
& Transformer-less
LightgreenConcept
13 Mar 2012
PMIC [LGC-P1], development information and future possibilities.
www.lightgreen.be
Phase SwitchingでLEDを駆動さ
せると、利用効率が50%しかな
い問題について
2. Lightgreen ConceptLightgreenConcept13Mar2012 Key Technology
Paradigm Shift : for AC Direct LED Driving
LED用電源の新しい考え方
AC交流 SMPSで直流(DC)電圧生成 PWMで電流制御 LED発光
Digital
Technology
Pulsating 脈流をデジタルで制御
従来の手法
新しいの手法 : 交流直接駆動方式(AC Direct Driving)
LGCのAC Direct LED Driving技術とは、ACを直接取り入れデジタル制御して、LEDに最適な
電圧と電流を供給することで、力率と効率を最適化するものである。特徴として、SMPSに
欠かせない電解コンデンサーと高調波トランスを使わずに済む。
電圧と電流を同時制御
交流直接駆動方式についてもう一度説明
2
7. Lightgreen ConceptLightgreenConcept13Mar2012
[2] IFM was measured at Tw≤1 msec of pulse width and D≤1/10 of duty ratio.
LED : ソウル半導体 STW8Q14BEの場合
Key Technology
IFM=300mAとなっているが、条件としてパルス幅を1msec以下にし
て、ディーティ比を1/10以下でならばと提示している。
7
8. Lightgreen ConceptLightgreenConcept13Mar2012 Key Technology
Phase Switching Technology Power Block
D C B A
If there were ‘n’ amount of LEDs from A to D,
this is a patented circuit which turns on the
switch relevant to the voltages needed in each
group, which will activate the LED by detecting
each voltage, current and sensor.
Even with different voltages in each groups,
the needed values are read accurately, there
fore even if the property of the LED changes, it
activates accordingly.
Also, the needed voltage values for each LED
groups are PWM controlled, and with inserted
temperature sensor, precise dimming control
and long life LED is possible.
It is successfully energy saving, compact and
long lasting.
Phase 1Phase 2Phase 3Phase 4
Phase 2
Phase 1
Phase 3
Phase 4
このPhase Switching方式では、AからDまで4グループなので、順番に
点灯すると、LEDの利用効率が50%しかない問題について
8
23. Lightgreen ConceptLightgreenConcept13Mar2012
Model for Night Blindness
Digital Journal of Ophthalmology
1998 Volume 4, Number 4
September 1, 1998
Eessentially normal fundus and negative electroretinogram (ERG) obtained FROM a
patient with Oguchi's disease after 30 minutes of dark adaptation (left) or 10 minutes of
light adaptation (right). Responses were recorded with short-wavelength (S) flash, middle-
wavelength (M) flash, and long-wavlength (L) flash of equivalent photopic intensity.
Broca Sulzer효과는 자극의 세기와 시감각의
자극이 강할수록 시감각의 반응도 크고
빨라진다. 시감각 반응의 속도는 색에 따라
다르며, 장파장 쪽이 단파장보다 빨리
반응한다. 이는 파랑보다 노랑, 노랑보다는
빨강이 더 빨리 지각되는 것을 의미한다.