소프트웨어학과 - ajou.ac.kr · 전필 인필 도메인분석및sw설계 < > 1 2 3 전필 인필 컴퓨터네트워크 < > 3 3 전필 인필 오픈소스SW입문
전자 회로 1 Lecture 5 (Diode II) 2009. 04. 임한조 아주대학교 전자공학부...
-
date post
20-Dec-2015 -
Category
Documents
-
view
239 -
download
2
Transcript of 전자 회로 1 Lecture 5 (Diode II) 2009. 04. 임한조 아주대학교 전자공학부...
전자 회로 1Lecture 5 (Diode II)
2009. 04.임한조
아주대학교 전자공학부[email protected]
이 강의 노트는 전자공학부 곽노준 교수께서 08.03 에 작성한 것으로 노트제공에 감사드림 .
April, 2008 Nojun Kwak 2
Review
Open circuit: ID = IS
Reverse-bias: I = IS - ID ~= IS
Breakdown (large reverse-bias): almost constant V
Forward-bias: I = ID – IS ~=ID
Current exponentially increases
April, 2008 Nojun Kwak 3
Forward-bias
Why n? n=1 or 2. fabrication dependent
Normally i >> Is
Temperature
dependence
April, 2008 Nojun Kwak 4
Load line
V / V (3.6)D TnD SI I e
V V (3.7)DD D
DI R
April, 2008 Nojun Kwak 5
Various diode modeling
Exponential model calculator solution Iterative analysis (see Example 3.4)
Piecewise linear model
April, 2008 Nojun Kwak 6
0V VDD DD
D
IR r
5 0.654.26 mA
1 0.02DI
0V V
0.65 4.26 0.02 0.735 VD D D DI r
Example 3.5 VDD = 5V, R = 1kohm model: VD0 = 0.65V, rD = 20 ohm
April, 2008 Nojun Kwak 7
Constant voltage drop model
April, 2008 Nojun Kwak 8
The Small-Signal Model
April, 2008 Nojun Kwak 9
V-I @ bias: Small perturbation: ( )
Small signal resistance (incremental resistance)
Taylor series approximation
April, 2008 Nojun Kwak 10
Zener Diode Mostly used for voltage regulator
knee current
April, 2008 Nojun Kwak 11
Example 3.8
April, 2008 Nojun Kwak 12
Applications: Rectifier Circuits
Diode circuitSee Chap. 3.5
RC circuitwith large time constant(low pass filter)
Zener diodeSee Chap. 3.4
April, 2008 Nojun Kwak 13
The half-wave rectifier
PIV = Vs : Peak inverse voltage PIV < VZ
April, 2008 Nojun Kwak 14
The full-wave rectifier
PIV = 2V Vs D
April, 2008 Nojun Kwak 15
The bridge rectifier
PIV = V 2V V V Vs D D s D
3 2(revers) = + (forward)D O D
April, 2008 Nojun Kwak 16
The peak rectifier (with LPF: RC circuit)
/ (3.23)L Oi R
(3.24)
(3.25)
D C L
IL
i i i
dC idt
Ideal: no load With load
If vI < vO :
Time constant
April, 2008 Nojun Kwak 17
April, 2008 Nojun Kwak 18
Limiter Circuits
Soft limiting
April, 2008 Nojun Kwak 19
April, 2008 Nojun Kwak 20
Clamping Circuits
April, 2008 Nojun Kwak 21
Voltage Doubler
April, 2008 Nojun Kwak 22
신호 검출기로서의 pn 다이오드
April, 2008 Nojun Kwak 23
빛을 전기로 , 전기를 빛으로
- 빛의 흡수 - 자연방출 - 유도방출
April, 2008 Nojun Kwak 24
pn 접합 발광 다이오드
April, 2008 Nojun Kwak 25
pn 접합 발광 다이오드의 응용
http://www.compoundsemiconductor.net/
Left: La Cittadella, a retail and cinema complex in Kawasaki, Japan, contains a 130 foot high tower illuminated by a variety of intelligent LED lighting effects including rainbow patterns and gradual color shifts. The complex's architect is the Jerde Partnership International, Inc, and the LED illumination is by Color Kinetics. (Photo: Masami Soto.) Center: three bridges across the Clyde river in Glasgow have been illuminated with high-intensity LED lighting. Luxeon LEDs from Lumileds and Philips floodlights were used in the installations. (Photo: Philips). Right: the Gazi Technopolis in Athens, Greece, designed by Duilio Passariello of Philips LiDAC Europe. (Photo: Philips.)
April, 2008 Nojun Kwak 26
pn 접합 발광 다이오드의 응용
현대자동차 HCD-8 Concept TourerKawasaki's La Cittadella complex also includes a fountain illuminated by constantly changing colored LED lights. (Photo: Masami Soto.)
April, 2008 Nojun Kwak 27
pn 접합 수광 다이오드
-0.5
0.0
0.5
1.0
-5 -4 -3 -2 -1 0 1
빛의 세기 = 0
빛의 세기 = I
빛의 세기 = 2I
I [mA]
V [V]
April, 2008 Nojun Kwak 28
pn 접합 태양전지
+ V −