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EEE 302 Electrical Networks II

EEE 302 Electrical Networks II. Dr. Keith E. Holbert Summer 2001. Thevenin/Norton Analysis. 1. Pick a good breaking point in the circuit (cannot split a dependent source and its control variable). 2. Thevenin : Compute the open circuit voltage, V OC .

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EEE 302 Electrical Networks II

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  1. EEE 302Electrical Networks II Dr. Keith E. Holbert Summer 2001 Lecture 4

  2. Thevenin/Norton Analysis 1. Pick a good breaking point in the circuit (cannot split a dependent source and its control variable). 2. Thevenin: Compute the open circuit voltage, VOC. Norton: Compute the short circuit current, ISC. For case 3(b) both VOC=0 and ISC=0 [so skip step 2] Lecture 4

  3. Thevenin/Norton Analysis 3. Compute the Thevenin equivalent resistance, RTh (or impedance, ZTh). (a) If there are only independent sources, then short circuit all the voltage sources and open circuit the current sources (just like superposition). (b) If there are only dependent sources, then must use a test voltage or current source in order to calculate RTh (or ZTh) = VTest/Itest (c) If there are both independent and dependent sources, then compute RTh (or ZTh) from VOC/ISC. Lecture 4

  4. Thevenin/Norton Analysis 4. Thevenin: Replace circuit with VOC in series with RTh, ZTh. Norton: Replace circuit with ISC in parallel with RTh, ZTh. Note: for 3(b) the equivalent network is merely RTh (or ZTh), that is, no voltage (or current) source. Only steps 2 & 4 differ from Thevenin & Norton! Lecture 4

  5. Isc Independent Sources (Norton) RTh Circuit with one or more independent sources Norton equivalent circuit Lecture 4

  6. No Independent Sources RTh Circuit without independent sources Thevenin equivalent circuit Lecture 4

  7. Class Example • Extension Exercise E8.18 Lecture 4

  8. PSpice Analysis of AC Circuits • Should have done this in ECE 301 • We must use AC sources, and tell PSpice to perform an AC analysis at specific frequency(ies) • PROBE allows us to plot our results • Take advantage of features (e.g., cursors) to assist your analysis • Completely annotate your schematic diagrams • MOST IMPORTANT RULE: You will always get an answer, you must judge its validity! Lecture 4

  9. Class Example • Extension Exercise E8.19 Lecture 4

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