1. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 1 학생 작성 강의록 3 장 : 저항 회로망 해석 Resistive Network Analysis 2013103800 김효진 2013103838 한소희 2010103815 정희형 2013103837 추연웅 2013103816 이보미

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

3. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 3 학생 작성 강의록 예)예) Step 1) select a reference node. AB 0 Step 2) identify all node voltages AND all element currents. I0I0 I1I1 I3I3 I2I2 Step 3) Write (N-1) KCL equations. Node A : I 0 + I 1 + I 2 = 0 Node B : I 2 = I 3

4. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 4 학생 작성 강의록 예)예) Step 4) Express element currents in terms of node voltages. AB 0 I0I0 I1I1 I3I3 I2I2 I 0 = - Is I 1 = V A /R 1 I 2 = V A – V B /R 2 I 3 = V B /R 3

5. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 5 학생 작성 강의록 예)예) AB 0 I0I0 I1I1 I3I3 I2I2 Step 5) substitute and rearrange. - Is + (V A /R 1 ) + (V A – V B /R 2 ) = 0 (V A – V B /R 2 ) = V B /R 3

6. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 6 학생 작성 강의록 Node Voltage Analysis

7. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 7 학생 작성 강의록 전압원의 처리방법 ②Reference node selection 예 ) Node Voltage Analysis ABC I1I1 I3I3 I2I2 Reference Node R/2 2R R/2 R I4I4

8. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 8 학생 작성 강의록 전압원의 처리방법 ②Reference node selection 예 ) Node Voltage Analysis ABC I1I1 I3I3 I2I2 Reference Node R/2 2R R/2 R I4I4

9. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 9 학생 작성 강의록 전압원의 처리방법 ③Super node Node Voltage Analysis +-+- VSVS 회로 I Super Node

10. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 10 학생 작성 강의록 예)예) Super Node

11. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 11 학생 작성 강의록 Mesh Current Analysis * Mesh : a loop that does not enclose an element Step 1) Identify a mesh current for every mesh and a voltage across every element. Step 2) Write KVL constraints around all meshes. Step 3) Express element voltage in terms of mesh currents. Step 4) substitute and rearrange.

12. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 12 학생 작성 강의록 Mesh Current Analysis 예) 예) Step 1) Identify a mesh current for every mesh and a voltage across every element.

13. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 13 학생 작성 강의록 Mesh Current Analysis 예) 예) Step 2) Write KVL constraints around all meshes.

14. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 14 학생 작성 강의록 Mesh Current Analysis 예) 예) Step 3) Express element voltage in terms of mesh currents.

15. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 15 학생 작성 강의록 Mesh Current Analysis 예) 예) Step 4) substitute and rearrange.

16. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 16 학생 작성 강의록 Mesh Current Analysis

17. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 17 학생 작성 강의록 전류원의 처리 ②A Current Source in only one mesh => mesh current = source current ③A Current Source in two meshes or a Current Source with series resistor => super mesh Mesh Current Analysis

18. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 18 학생 작성 강의록 중첩의 원리 Step1) Turn off all independent input source Step2) Find output for each input only Step3) Add all output -Voltage source 의 경우는 short -Current source 의 경우는 open

19. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 19 학생 작성 강의록 예 1) (Vo=7.5V) step 2) V1 Short Vo2=2.5V Vo=Vo1+Vo2=5V+2.5V =7.5V Vo1=5v Step 1)V2 Short step3) add all input

20. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 20 학생 작성 강의록 예 2 ) (Vo=?) Step 1) V1 short Step 2) Is Open Vo=Vo1+Vo2=0+R3 X Vs/(R2+R3) Vo=Vs X R3/(R2+R3) Step 3) Add all Input

21. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 21 학생 작성 강의록 Thevenin - Norton equivalent 테브닌의 정리 : 부하의 관점에서 어떤 회로라도 이상 전압원 Vt 와 등가저항 Rt 가 직렬 연결된 등가회로로 나타낼 수 있다. 노턴의 정리 : 부하의 관점에서 어떤 회로라도 이상 전류원 It 와 등가저항 Rn 이 병렬 연결된 등가회로로 나타낼 수 있다.

22. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 22 학생 작성 강의록 Thevenin - Norton equivalent 방법.1 -> Vt = Voc : 개방전압 ->In = Isc : 단락전류 ->Rt = Rn = Vt/In 방법.2 ->Vt = Voc : 개방전압 ->Rt : 모든 전원을 제거한 후의 등가저항

23. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 23 학생 작성 강의록 Thevenin - Norton equivalent 예 1)

24. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 24 학생 작성 강의록 Thevenin - Norton equivalent 예 1) 방법. 1

25. Dept. of Biomed. Eng.BME207: Basic Electronic CircuitsKyung Hee Univ. www.ejwoo.comwww.ejwoo.com 25 학생 작성 강의록 Thevenin - Norton equivalent 예 1) 방법. 2