Tuesday, March 22, 2011

5.1 Expressing Differential Equations in State Equation Form

Chapter 5 State Variables and State Equations

  • Circuits that contain energy-storing devices (capacitor & inductor) result in integro-differential equations via KCL & KVL
  • One energy-storing device = first order; Two energy-storing device = second order; so on
  • A first order linear time-invariant circuit can be described by a differential equation of the form:





  • An nth-order differential equation can be resolved to n first-order simultaneous differential equation with a set of auxiliary variables called state variables
  • The resulting first order differential equations are called state-space equations or simply state equations
  • State variables method can also be used on non-linear, time-varying devices
  • State equations can also be solved with numerical methods such as Taylor series and Runge-Kutta methods

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