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Unformatted text preview: ine the short‐circuit current and then determine the Thevenin’s resistance as shown earlier. 52 EE1002 Introduction to Circuits and Systems Source conversion: Voltage source with series resistance can be converted to equivalent current source with the same resistance in parallel. Similarly, a current source with a parallel resistance can be converted to an equivalent voltage source in series with the resistance. The relationship between the voltage and the current source is: Vs
R Vs I s R
Is RT a a
IN VT b
equivalent circuit RT b
equivalent circuit The relationship between the reference current direction and the voltage polarity should be maintained. This means that the positive of the voltage source is closer to terminal a, then the current should be entering into terminal a. 53 EE1002 Introduction to Circuits and Systems Experimental determination of Thevenin and Norton equivalents RL Make sure the load (or the circuit to be interfaced) is disconnected. 1) a
sources b 2) When the circuit is powered up, measure the voltage between the terminals using a voltmeter. This will be the open circuit voltage or Thevenin voltage. vOC Vt vOC 3) Power down the circuit. Connect an amme...
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This document was uploaded on 01/20/2014.
- Winter '14