File indexing completed on 2024-04-28 05:43:15 

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 #ifndef DIODE_H
0012 #define DIODE_H
0013 
0014 #include "nonlinear.h"
0015 
0016 class DiodeSettings
0017 {
0018 public:
0019     DiodeSettings();
0020     void reset();
0021 
0022     double I_S; ///< Diode saturation current
0023     double N;   ///< Emission coefficient
0024     double V_B; ///< Reverse breakdown
0025     //      double R;   ///< Series resistance
0026 };
0027 
0028 /**
0029 This simulates a diode. The simulated diode characteristics are:
0030 
0031 @li I_s: Diode saturation current
0032 @li V_T: Thermal voltage = kT/4 = 25mV at 20 C
0033 @li n: Emission coefficient, typically between 1 and 2
0034 @li V_RB: Reverse breakdown (large negative voltage)
0035 @li G_RB: Reverse breakdown conductance
0036 @li R_D: Base resistance of diode
0037 
0038 @short Simulates the electrical property of diode-ness
0039 @author David Saxton
0040 */
0041 class Diode : public NonLinear
0042 {
0043 public:
0044     Diode();
0045     ~Diode() override;
0046 
0047     void update_dc() override;
0048     void add_initial_dc() override;
0049     Element::Type type() const override
0050     {
0051         return Element_Diode;
0052     }
0053     DiodeSettings settings() const
0054     {
0055         return m_diodeSettings;
0056     }
0057     void setDiodeSettings(const DiodeSettings &settings);
0058     /**
0059      * Returns the current flowing through the diode
0060      */
0061     double current() const;
0062 
0063 protected:
0064     void updateCurrents() override;
0065     void calc_eq();
0066     void calcIg(double V, double *I, double *g) const;
0067     void updateLim();
0068 
0069     double g_new, g_old;
0070     double I_new, I_old;
0071     double V_prev;
0072     double V_lim;
0073 
0074     DiodeSettings m_diodeSettings;
0075 };
0076 
0077 #endif