Configured to generate a pwm using a sine function. For the complementary pwm for h-bridge you may invert it by hardware and connect it to a IR2110 in order to provide a dead time on turn on
Fork of Inverter_epusalle by
main.cpp@2:3d02ab7f1776, 2019-05-15 (annotated)
- Committer:
- roncanciovl
- Date:
- Wed May 15 17:39:48 2019 +0000
- Revision:
- 2:3d02ab7f1776
- Parent:
- 1:19c43d391b22
Ajustes
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
roncanciovl | 1:19c43d391b22 | 1 | /* Power electronics usalle*/ |
roncanciovl | 1:19c43d391b22 | 2 | |
jromeroramos | 0:30dcc43db185 | 3 | #include "mbed.h" |
jromeroramos | 0:30dcc43db185 | 4 | |
jromeroramos | 0:30dcc43db185 | 5 | |
jromeroramos | 0:30dcc43db185 | 6 | #ifndef M_PI |
jromeroramos | 0:30dcc43db185 | 7 | #define M_PI 3.14159265358979323846 |
jromeroramos | 0:30dcc43db185 | 8 | #endif |
jromeroramos | 0:30dcc43db185 | 9 | |
roncanciovl | 1:19c43d391b22 | 10 | // Number of samples to generate sine pattern |
roncanciovl | 1:19c43d391b22 | 11 | #define SINE_STEPS 100 |
roncanciovl | 1:19c43d391b22 | 12 | // Pwm period in us |
roncanciovl | 1:19c43d391b22 | 13 | #define PWM_PERIOD 20 |
roncanciovl | 1:19c43d391b22 | 14 | |
roncanciovl | 1:19c43d391b22 | 15 | |
jromeroramos | 0:30dcc43db185 | 16 | DigitalOut myled(LED1); |
roncanciovl | 1:19c43d391b22 | 17 | PwmOut CH1(PWM_OUT); |
roncanciovl | 1:19c43d391b22 | 18 | |
roncanciovl | 1:19c43d391b22 | 19 | |
jromeroramos | 0:30dcc43db185 | 20 | |
jromeroramos | 0:30dcc43db185 | 21 | // dc : duty cycle |
roncanciovl | 1:19c43d391b22 | 22 | // n: a sample |
roncanciovl | 1:19c43d391b22 | 23 | // T: Time in microsecond the sine_dc function is evaluated |
roncanciovl | 1:19c43d391b22 | 24 | // 1/PWM_PERIOD defines the conmutation frequency (default 50kHz) |
roncanciovl | 1:19c43d391b22 | 25 | // T divided by PWM_PERIOD defines the number of pwm cycles for each sine term sample (default 8.3) |
roncanciovl | 1:19c43d391b22 | 26 | // T times SINE_STEPS defines sine modulation period |
jromeroramos | 0:30dcc43db185 | 27 | |
jromeroramos | 0:30dcc43db185 | 28 | /* This program calculates values of a sine |
jromeroramos | 0:30dcc43db185 | 29 | function and splits them up in 100 points, these points are then written |
jromeroramos | 0:30dcc43db185 | 30 | to the duty cycle of the pwm signals. |
jromeroramos | 0:30dcc43db185 | 31 | */ |
jromeroramos | 0:30dcc43db185 | 32 | Ticker interrupt; |
jromeroramos | 0:30dcc43db185 | 33 | InterruptIn button(USER_BUTTON); |
jromeroramos | 0:30dcc43db185 | 34 | int n; |
jromeroramos | 0:30dcc43db185 | 35 | double dc_min = 0.0, dc_max = 1.0; |
jromeroramos | 0:30dcc43db185 | 36 | void sine_dc() { |
jromeroramos | 0:30dcc43db185 | 37 | double dc, sine_term; |
jromeroramos | 0:30dcc43db185 | 38 | n = n + 1; |
roncanciovl | 1:19c43d391b22 | 39 | if(n == SINE_STEPS) n = 0; |
roncanciovl | 1:19c43d391b22 | 40 | sine_term = sin(2*M_PI*n/SINE_STEPS); |
roncanciovl | 1:19c43d391b22 | 41 | // Convert sine term to duty cycle: if sine_term == 0, then dc = 0.5 |
roncanciovl | 2:3d02ab7f1776 | 42 | if (sine_term > 0) dc = 0.5 + (sine_term * (dc_max - 0.5)); |
roncanciovl | 2:3d02ab7f1776 | 43 | if (sine_term < 0) dc = 0.5 + (sine_term * (0.5 - dc_min)); |
roncanciovl | 2:3d02ab7f1776 | 44 | if (sine_term == 0) dc = 0.5; |
roncanciovl | 1:19c43d391b22 | 45 | CH1.write(dc); |
roncanciovl | 2:3d02ab7f1776 | 46 | } |
roncanciovl | 1:19c43d391b22 | 47 | |
jromeroramos | 0:30dcc43db185 | 48 | int main() { |
roncanciovl | 1:19c43d391b22 | 49 | int T = 166; |
jromeroramos | 0:30dcc43db185 | 50 | n = 0; |
roncanciovl | 1:19c43d391b22 | 51 | CH1.period_us(PWM_PERIOD); |
jromeroramos | 0:30dcc43db185 | 52 | CH1.write(0.5); |
roncanciovl | 1:19c43d391b22 | 53 | |
roncanciovl | 1:19c43d391b22 | 54 | |
roncanciovl | 1:19c43d391b22 | 55 | |
roncanciovl | 1:19c43d391b22 | 56 | // |
roncanciovl | 1:19c43d391b22 | 57 | interrupt.attach_us(&sine_dc, T); |
jromeroramos | 0:30dcc43db185 | 58 | |
jromeroramos | 0:30dcc43db185 | 59 | while(1) { |
jromeroramos | 0:30dcc43db185 | 60 | myled = !myled; |
jromeroramos | 0:30dcc43db185 | 61 | wait(1); |
jromeroramos | 0:30dcc43db185 | 62 | } |
jromeroramos | 0:30dcc43db185 | 63 | } |
jromeroramos | 0:30dcc43db185 | 64 |