1
(LED) (SCR) - (, ) ' 4Z1PF 2014
(PIV, PRV)
(LED-Light-Emitting Diode)
(LED)
(LED)
(LED)
(LED)
(LED)
(LED)
(LED)Forward Current vs Forward Voltage
Red5, Ultra Red4, HE Red6, Orange7, Bright Red3,HE Green9,
Yellow8
Relative Luminous Intensity vsForward Current
Ultra Red4, HE Red6, Orange7, Yellow8, HE Green9Red5, Bright
Red3, Pure BlueC (SCR-Silicon-Controlled Rectifier)
(SCR)
(SCR)
(SCR)
TRIAC(TRIode for Alternating Current)
TRIAC(TRIode for Alternating Current)DIAC, or
DiodeforAlternating Current
TRIAC(TRIode for Alternating Current)
DIAC, or DiodeforAlternating Current
-
-
-
- :
"
DC (RF) ()
Class A Class B Class C
,
- CE - CB - CC
vivo
?
, A
'
Class A
Push-pull
Class AB
ClassABCABConductionAngle360o180oLess than 90o180 to
360oPosition ofthe Q-pointCentre Point ofthe Load LineExactly on
theX-axisBelow theX-axisIn between theX-axis and theCentre Load
LineOverallEfficiencyPoor, 25 to 30%Better, 70 to 80%Higher than
80%Better than Abut less than B50 to 70%SignalDistortionNone if
CorrectlyBiasedAt the X-axisCrossover PointLarge AmountsSmall
Amounts ( )
( )
:
((Amplitude Distortion
(Frequency Distortion)
, Phase Distortion) )
- , .
( Crossover Distortion) CLASS-B . Class-AB ()
() -
() -
" /
" /
:
. A=1000. A -50%
1% - 50% A>>1 Af=1/B A
