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/***************************************************************************
* 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;
r_eq_old = 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;
}
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.
r_eq_old = v_eq_old = 0.0;
}
void Inductance::updateCurrents()
{
if (!b_status)
return;
m_cnodeI[0] = p_cbranch[0]->i;
m_cnodeI[1] = -m_cnodeI[0];
}
void Inductance::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_constant, true );
p_A->setUse_b( p_cnode[0]->n(), p_cbranch[0]->n(), Map::et_constant, true );
}
if ( !p_cnode[1]->isGround )
{
p_A->setUse_c( p_cbranch[0]->n(), p_cnode[1]->n(), Map::et_constant, true );
p_A->setUse_b( p_cnode[1]->n(), p_cbranch[0]->n(), Map::et_constant, true );
}
p_A->setUse_d( p_cbranch[0]->n(), p_cbranch[0]->n(), Map::et_unstable, false );
}
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 ( r_eq_old != r_eq_new )
{
A_d( 0, 0 ) -= r_eq_new - r_eq_old;
}
if ( v_eq_new != v_eq_old )
{
b_v( 0 ) += v_eq_new - v_eq_old;
}
r_eq_old = r_eq_new;
v_eq_old = v_eq_new;
}
bool Inductance::updateStatus()
{
b_status = Reactive::updateStatus();
if ( m_method == Inductance::m_none )
b_status = false;
return b_status;
}
void Inductance::setMethod( Method m )
{
m_method = m;
updateStatus();
}
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