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/***************************************************************************
* Copyright (C) 2003-2005 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 "capacitance.h"
#include "matrix.h"
Capacitance::Capacitance( const double capacitance, const double delta )
: Reactive(delta)
{
m_cap = capacitance;
g_eq_old = i_eq_old = 0.;
m_numCNodes = 2;
setMethod( Capacitance::m_euler );
}
Capacitance::~Capacitance()
{
}
void Capacitance::setCapacitance( const double c )
{
m_cap = c;
}
void Capacitance::add_initial_dc()
{
// We don't need to do anything here, as time_step() will do that for us,
// apart from to make sure our old values are 0
g_eq_old = i_eq_old = 0.;
}
void Capacitance::updateCurrents()
{
if (!b_status) return;
const double r_i = (p_cnode[0]->v-p_cnode[1]->v)*g_eq_old;
m_cnodeI[0] = -i_eq_old-r_i;
m_cnodeI[1] = -m_cnodeI[0];
}
void Capacitance::add_map()
{
if (!b_status) return;
if ( !p_cnode[0]->isGround )
{
p_A->setUse( p_cnode[0]->n(), p_cnode[0]->n(), Map::et_unstable, false );
}
if ( !p_cnode[1]->isGround )
{
p_A->setUse( p_cnode[1]->n(), p_cnode[1]->n(), Map::et_unstable, false );
}
if ( !p_cnode[0]->isGround && !p_cnode[1]->isGround )
{
p_A->setUse( p_cnode[0]->n(), p_cnode[1]->n(), Map::et_unstable, false );
p_A->setUse( p_cnode[1]->n(), p_cnode[0]->n(), Map::et_unstable, false );
}
}
void Capacitance::time_step()
{
if (!b_status) return;
double v = p_cnode[0]->v-p_cnode[1]->v;
double i_eq_new = 0.0, g_eq_new = 0.0;
if ( m_method == Capacitance::m_euler )
{
g_eq_new = m_cap/m_delta;
i_eq_new = -v*g_eq_new;
}
else if ( m_method == Capacitance::m_trap ) {
// TODO Implement + test trapezoidal method
g_eq_new = 2.*m_cap/m_delta;
}
if ( g_eq_old != g_eq_new )
{
A_g( 0, 0 ) += g_eq_new-g_eq_old;
A_g( 1, 1 ) += g_eq_new-g_eq_old;
A_g( 0, 1 ) -= g_eq_new-g_eq_old;
A_g( 1, 0 ) -= g_eq_new-g_eq_old;
}
if ( i_eq_new != i_eq_old )
{
b_i( 0 ) -= i_eq_new-i_eq_old;
b_i( 1 ) += i_eq_new-i_eq_old;
}
g_eq_old = g_eq_new;
i_eq_old = i_eq_new;
}
bool Capacitance::updateStatus()
{
b_status = Reactive::updateStatus();
if ( m_method == Capacitance::m_none ) b_status = false;
return b_status;
}
void Capacitance::setMethod( Method m )
{
m_method = m;
updateStatus();
}
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