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inductance.cpp

/***************************************************************************
 *   Copyright (C) 2005 by David Saxton                                    *
 *   david@bluehaze.org                                                    *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 ***************************************************************************/

#include "elementset.h"
#include "inductance.h"
#include "matrix.h"

Inductance::Inductance( double inductance, double delta )
      : Reactive(delta)
{
      m_inductance = inductance;
      scaled_inductance = v_eq_old = 0.0;
      m_numCNodes = 2;
      m_numCBranches = 1;
      setMethod( Inductance::m_euler );
}


Inductance::~Inductance()
{
}


void Inductance::setInductance( double i )
{
      m_inductance = i;
}


00037 void Inductance::add_initial_dc()
{
      A_c( 0, 0 ) = 1;
      A_b( 0, 0 ) = 1;
      A_c( 0, 1 ) = -1;
      A_b( 1, 0 ) = -1;
      
      // The adding of r_eg and v_eq will be done for us by time_step.
      // So for now, just reset the constants used.
      scaled_inductance = v_eq_old = 0.0;
}


00050 void Inductance::updateCurrents()
{
      if (!b_status) return;

      m_cnodeI[0] = -p_cbranch[0]->i;
      m_cnodeI[1] = -m_cnodeI[0];
}

00058 void Inductance::time_step()
{
      if (!b_status) return;
      
      double i = p_cbranch[0]->i;
      double v_eq_new = 0.0, r_eq_new = 0.0;
      
      if ( m_method == Inductance::m_euler )
      {
            r_eq_new = m_inductance / m_delta;
            v_eq_new = -i * r_eq_new;
      }
      else if ( m_method == Inductance::m_trap ) {
            // TODO Implement + test trapezoidal method
            r_eq_new = 2.0 * m_inductance / m_delta;
      }
      
      if ( scaled_inductance != r_eq_new )
      {
            A_d( 0, 0 ) -= r_eq_new - scaled_inductance;
      }
      
      if ( v_eq_new != v_eq_old )
      {
            b_v( 0 ) += v_eq_new - v_eq_old;
      }
      
      scaled_inductance = r_eq_new;
      v_eq_old = v_eq_new;
}


00090 bool Inductance::updateStatus()
{
      b_status = Reactive::updateStatus();
      if ( m_method == Inductance::m_none )
            b_status = false;
      return b_status;
}


00099 void Inductance::setMethod( Method m )
{
      m_method = m;
      updateStatus();
}


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