SVM.cpp

00001 
00002 #include "mbed.h"
00003 #include "SVM.h"
00004 #include "Inverter.h"
00005 #define min(x,y,z) (x < y ? (x < z ? x : z) : (y < z ? y : z))
00006 #define max(x,y,z) (x > y ? (x > z ? x : z) : (y > z ? y : z))
00007 
00008 SPWM::SPWM(Inverter *inverter, float V_Bus){
00009     _inverter = inverter;
00010     _V_Bus = V_Bus;
00011     }
00012 
00013 //sinusoidal PWM
00014 void SPWM::Update_DTC(float V_A, float V_B, float V_C){
00015     float DTC_A = V_A/_V_Bus + .5f;
00016     float DTC_B = V_B/_V_Bus + .5f;
00017     float DTC_C = V_C/_V_Bus + .5f;
00018     
00019     if(DTC_A > .95f) DTC_A = .95f;
00020     else if(DTC_A < .05f) DTC_A = .05f;
00021     if(DTC_B > .95f) DTC_B = .95f;
00022     else if(DTC_B < .05f) DTC_B = .05f;
00023     if(DTC_C > .95f) DTC_C = .95f;
00024     else if(DTC_C < .05f) DTC_C = .05f;
00025     _inverter->SetDTC(DTC_A, DTC_B, DTC_C);
00026     }
00027 
00028 SVPWM::SVPWM(Inverter *inverter, float V_Bus){
00029     _inverter = inverter;
00030     _V_Bus = V_Bus;
00031     }
00032     
00033 //space vector pwm (better bus utilization)
00034 void SVPWM::Update_DTC(float V_A, float V_B, float V_C){
00035     
00036     float Voff = (min(V_A, V_B, V_C) + max(V_A, V_B, V_C))/2.0f;
00037     
00038     V_A = V_A - Voff;
00039     V_B = V_B - Voff;
00040     V_C = V_C - Voff;
00041     
00042     float DTC_A = V_A/_V_Bus + .5f;
00043     float DTC_B = V_B/_V_Bus + .5f;
00044     float DTC_C = V_C/_V_Bus + .5f;
00045     
00046     
00047     
00048     if(DTC_A > .95f) DTC_A = .95f;
00049     else if(DTC_A < .05f) DTC_A = .05f;
00050     if(DTC_B > .95f) DTC_B = .95f;
00051     else if(DTC_B < .05f) DTC_B = .05f;
00052     if(DTC_C > .95f) DTC_C = .95f;
00053     else if(DTC_C < .05f) DTC_C = .05f;
00054     _inverter->SetDTC(DTC_A, DTC_B, DTC_C);
00055     }
00056