electronics/simulation/voltagesource.cpp

0001 /***************************************************************************
0002  *   Copyright (C) 2003-2004 by David Saxton                               *
0003  *   david@bluehaze.org                                                    *
0004  *                                                                         *
0005  *   This program is free software; you can redistribute it and/or modify  *
0006  *   it under the terms of the GNU General Public License as published by  *
0007  *   the Free Software Foundation; either version 2 of the License, or     *
0008  *   (at your option) any later version.                                   *
0009  ***************************************************************************/
0010
0011 #include "voltagesource.h"
0012 #include "elementset.h"
0013
0014 VoltageSource::VoltageSource(const double voltage)
0015     : Element::Element()
0016 {
0017     m_v = voltage;
0018     m_numCBranches = 1;
0019     m_numCNodes = 2;
0020 }
0021
0022 VoltageSource::~VoltageSource()
0023 {
0024 }
0025
0026 void VoltageSource::setVoltage(const double v)
0027 {
0028     if (m_v == v)
0029         return;
0030
0031     if (p_eSet)
0032         p_eSet->setCacheInvalidated();
0033
0034     m_v = v;
0035     add_initial_dc();
0036 }
0037
0038 void VoltageSource::add_initial_dc()
0039 {
0040     if (!b_status)
0041         return;
0042
0043     A_b(0, 0) = -1;
0044     A_c(0, 0) = -1;
0045     A_b(1, 0) = 1;
0046     A_c(0, 1) = 1;
0047
0048     b_v(0) = m_v;
0049 }
0050
0051 void VoltageSource::updateCurrents()
0052 {
0053     if (!b_status)
0054         return;
0055     m_cnodeI[0] = p_cbranch[0]->i;
0056     m_cnodeI[1] = -m_cnodeI[0];
0057 }