1. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 1 학생 작성 강의록 Chapter 3 저항 회로망 해석 김소담 김수진 김영은 김현희 이지혜

2. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 2 학생 작성 강의록 Node Voltage Analysis Select a reference node. Identify all node voltages. Identify all element currents. Write (N-1) KCL equations. Express element current in terms of node voltages. Substitute and rearrange. Step 1 Step 2 Step 3 Step 4 Step 5

3. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 3 학생 작성 강의록 Node Voltage Analysis Step 3 Step 4 Step 5

4. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 4 학생 작성 강의록 Node Voltage Analysis 정리 N 개의 node → (N-1) KCL equations → (N-1) node voltages → AX = B, 해 = x A: 회로에 대한 정보 ( 저항값 ) B: source (is) X: Node Voltage

5. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 5 학생 작성 강의록 Node Voltage Analysis * 전압원의 처리 방법 ( 전압원이 불편한 경우 ) 1) Source Transformation Vs Rs Is =

6. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 6 학생 작성 강의록 Node Voltage Analysis * 전압원의 처리 방법 ( 전압원이 불편한 경우 ) 1) Source Transformation Ex) Step 3 Step 4

7. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 7 학생 작성 강의록 Node Voltage Analysis * 전압원의 처리 방법 ( 전압원이 불편한 경우 ) 2) Reference node selection Ex)

8. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 8 학생 작성 강의록 Node Voltage Analysis * 전압원의 처리 방법 ( 전압원이 불편한 경우 ) 3) Super Node

9. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 9 학생 작성 강의록 Mesh Current Analysis Mesh : a loop that does not enclose an element Step 1 Step 2 Step 3 Step 4 Identity a mesh current for every mesh and a voltage across every element Write KVL constraints around all meshes Express element Voltage in terms of mesh current Substitute and rearrange and solve : mesh

10. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 10 학생 작성 강의록 Mesh Current Analysis Example iAiBV0 V1V2 V4 ① Example

11. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 11 학생 작성 강의록 Ex)

12. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 12 학생 작성 강의록 Mesh Current Analysis 요령 ① ② ③ A current source in only one mesh → mesh current = source current A current source in two meshes or A current source with series resistor → Super mesh

13. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 13 학생 작성 강의록 Ex1) 8V= 4kΩ X 2mA Mesh Current Analysis 요령

14. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 14 학생 작성 강의록 Ex2) Mesh Current Analysis 요령

15. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 15 학생 작성 강의록 Linearity - 선형성 - Input : Signal produced by independent source ex) 전압원 전류원 - Output : any other designated signal ex) 전압, 전류 * Linear Circuit ( 선형회로 ) 은 아래의 2 가지 조건을 만족시켜야 한다. ① Homogenity (Proportionality) : f(kx) = k f(x) ② Additivity (Superposition) : f(x1+x2) = f(x1)+f(x2) * R( 저항 ) L( 인덕터 ) C( 커패시터 ) 만을 포함하는 회로는 선형회로

16. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 16 학생 작성 강의록 Bridge circuit Example VOVO V1V1 V2V2 V3V3 V4V4

17. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 17 학생 작성 강의록 Case 1Case 2 is=0 일때 Vs=0 일때

18. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 18 학생 작성 강의록 Principle of Superposition( 중첩의 원리 ) 선형회로에서만 사용가능 !! 압력이 여러 개일 때 출력은 각각 입력했을 때의 결과값의 합과 동일 Turn off all independent sources(input) Find output for each input only Add all outputs

19. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 19 학생 작성 강의록

20. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 20 학생 작성 강의록 ex) V s = V o1 + V o2 + V o3 =1/3(V s1 +V s2 +V s3 ) 평균값

21. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 21 학생 작성 강의록 ex)

22. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 22 학생 작성 강의록 ex) 끊어져서 i=0 이 되므로 같은 노드가 됨 ! 저항이 없는 것이라고 생각 ~

23. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 23 학생 작성 강의록 Thevenin and Norton Equivalent Circuit R T =R N V T =I N *R T 방법 1 방법 2 V T =V oc : 개방전압 i N =i sc : 단락전류 R T =R N =V T /V N V T =V oc R T : 모든 전원을 제거한 후의 등가저항

24. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 24 학생 작성 강의록 ex) 부하부하 Vo 선형회로 Thevenin 방법 1 V T =V OC = V S R 2 R 1 +R 3 R T =R 3 +(R 1 //R 2 ) =R 3 + R 1 R 2 R 1 +R 2

25. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 25 학생 작성 강의록 방법 2 Isc R 2 R 1 +R 3 =R 3 + R 1 R 2 R 1 +R 2

26. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 26 학생 작성 강의록 Loading Effect( 부하효과 ) 부하저항에 따라 V, I, P 가 변함 VTVT RTRT VoVo 최대출력전압 V Lmax =V T =V oc 최소출력전류 =0 (RL=∞) 최대출력전압 V Lmin =0=V sc 최소출력전류 =V T /R T (RL=0) 전력 =0 RLRL VLVL ILIL PLPL 00V T /R T 0 ……… ∞ VTVT 00 커졌다 작아짐

27. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 27 학생 작성 강의록 R T =R L 일 때 P 최댓값 VLVL PLPL RLRL VTRTVTRT VTVT (V T ) 4R T 2 P LMAX V L ( R L =R T ) = 1/2V T i T ( R L =R T ) = V T /2R L P L ( R L =R T ) = (V T )^2/4R L

28. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 28 학생 작성 강의록 VTVT RTRT VLVL Nonlinear Load load iLiL VTRTVTRT VTVT VLVL iLiL Load line ( 부하선 ) 무엇이 연결되든 간에 위의 선 ( 부하선 ) 을 만족해야한다

29. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 29 학생 작성 강의록 iLiL VLVL RLRL :Ohm’ s Law VLVL iLiL 1 R L :Slope 부하의 소자에 따라 결정 VLVL iLiL Element constraint 와 Load line 그래프의 교점

30. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. http://www.ejwoo.comhttp://www.ejwoo.com 30 학생 작성 강의록 3장 끝3장 끝 Thank you!