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kortas edited this page May 26, 2015 · 1 revision

PWM implementation

For more information check http://en.wikipedia.org/wiki/SAE_J1772

6-50A

Amps = Duty cycle X 0.6
Duty cycle = Amps / 0.6

51-80A

Amps = (Duty cycle - 64) X 2.5
Duty cycle = (Amps / 2.5) + 64

6A	10%
12A	20%
18A	30%
24A	40%
30A	50%
40A	66%
48A	80%
65A	90%
75A	94%
80A	96%

Code:


if (amps < 51)
  duty = 1000 - (100 * amps) / 6;
else
  duty = 1000 - (4*amps+640);

//set PWM output 10bit
CCPR1L = duty >> 2;
duty &= 0b00000011;
duty <<= 4;
CCP1CON = duty + 12; //1100