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ECE320_Chapter_1

ECE320_Chapter_1 - ECE 320 Energy Conversion and Power...

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1- 1 ECE 320 Energy Conversion and Power Electronics Spring 2009 Instructor: Tim Hogan Chapter 1: Introduction and Three Phase Power 1.1 Review of Basic Circuit Analysis Definitions: Node - Electrical junction between two or more devices. Loop - Closed path formed by tracing through an ordered sequence of nodes without passing through any node more than once. Element Constraints: Ohm’s Law iR v = Capacitor Equation dt dv C i = Inductor Equation dt di L v = Connection Constraints: Kirchhoff’s Current Law - The algebraic sum of currents entering a node is zero at every instant in time. 0 = Node k i (1.1) Kirchhoff’s Voltage Law - The algebraic Sum of all voltages around a loop is zero at every instant in time. 0 = Loop k v (1.2) Passive Sign Convention: Whenever the reference direction of current into a two terminal device is in the direction of the reference voltage drop across the device, then the power absorbed (or dissipated) is positive. Figure 1. Circuit element and passive sign convention. + _ v i

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