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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

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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.

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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

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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

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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

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

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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

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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

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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

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

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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.

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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.

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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.

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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.

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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.

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

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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

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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

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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

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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

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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.

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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

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

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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

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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

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