vcvs.cpp

/***************************************************************************
 *   Copyright (C) 2003-2004 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 "matrix.h"
#include "vcvs.h"

VCVS::VCVS( const double gain )
        : Element::Element()
{
        m_g = gain;
        m_numCBranches = 1;
        m_numCNodes = 4;
}


VCVS::~VCVS()
{
}


void VCVS::setGain( const double g )
{
        if ( g == m_g )
                return;
        
        if (p_eSet)
                p_eSet->setCacheInvalidated();
        
        m_g = -m_g;
        add_initial_dc();

        m_g = g;
        add_initial_dc();
}


void VCVS::add_map()
{
        if (!b_status)
                return;
        
        if ( !p_cnode[0]->isGround )
        {
                p_A->setUse_c( p_cbranch[0]->n(), p_cnode[0]->n(), Map::et_stable, false );
        }
        if ( !p_cnode[1]->isGround  )
        {
                p_A->setUse_c( p_cbranch[0]->n(), p_cnode[1]->n(), Map::et_stable, false );
        }
        if ( !p_cnode[2]->isGround  )
        {
                p_A->setUse_b( p_cnode[2]->n(), p_cbranch[0]->n(), Map::et_constant, true );
                p_A->setUse_c( p_cbranch[0]->n(), p_cnode[2]->n(), Map::et_constant, true );
        }
        if ( !p_cnode[3]->isGround  )
        {
                p_A->setUse_b( p_cnode[3]->n(), p_cbranch[0]->n(), Map::et_constant, true );
                p_A->setUse_c( p_cbranch[0]->n(), p_cnode[3]->n(), Map::et_constant, true );
        }
}


void VCVS::add_initial_dc()
{
        if (!b_status)
                return;
        
        A_c( 0, 0 ) -= m_g;
        A_c( 0, 1 ) += m_g;
        A_b( 2, 0 ) = 1;
        A_c( 0, 2 ) = 1;
        A_b( 3, 0 ) = -1;
        A_c( 0, 3 ) = -1;
}


void VCVS::updateCurrents()
{
        if (!b_status) return;
        m_cnodeI[0] = m_cnodeI[1] = 0.;
        m_cnodeI[3] = p_cbranch[0]->i;
        m_cnodeI[2] = -m_cnodeI[3];
}

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