hi..
This is sivaram from india. I developed a code file which is supposed to run in motoring mode and braking if needed. I probed the DC input current of the inverter its showing as figure attached. one of the inverter leg is getting heated. The switch numbering is describe in the code file. I don't know the reason why it is happening. If additional info is need I can give the details.
hope it makes sense, what i am asking for......
// This is code is for BLDC motor is operated in PWM mode for motoring and braking operation.
// The LOW side swithces are intended to operated in PWM with TIMER3 output pins and HIGH side switches are just turn on and off.
// The high side switches T1 connected to pin 10
// T3 pin 9
// T5 pin 8
// The low side switches T4 connected to pin 5
// T6 pin 3
// T2 pin 2
// The pin 50 is used as the switch for the transition.
// Polling variable.
volatile uint8_t ZZ = 0, XX = 0;
void setup()
{
// enable the global interrupts
sei();
// setting pin 50 for the transition between motoring and braking.
pinMode(50,INPUT_PULLUP);
// setting PORTC as input port. mainly to read pin 33 34 and 35 on the board.
DDRC = 0x00;
// turning on the internal pull-up resistors of the MCU.
PORTC = 0xFF;
// High side switching signals
pinMode(8,OUTPUT);
pinMode(9,OUTPUT);
pinMode(10,OUTPUT);
// setting PIN 13 as high for the MOSFET driver AND gate input.
pinMode(13,OUTPUT);
digitalWrite(13,HIGH);
// starting the timer3 for PWM generation of LOW side switches.
TCNT3 = 0x0000;
OCR3B = 35;
OCR3A = 35;
OCR3C = 35;
ICR3L = 50;
TCCR3A = 0b10101010;
TCCR3B = 0b00011011;
// starting timer4 for event management. (polling of hall signal is done for every 15 us)
TCNT4 = 0x0000;
OCR4B = 0x0F;
OCR4A = 0x00EF;
TIMSK4 = 0b00000010;
TCCR4A = 0b00100011;
TCCR4B = 0b00011001;
}
void loop()
{
// Do nothing.
}
ISR(TIMER4_COMPA_vect)
{
XX = PINB;
if((XX & (1 << 3)))
{
// motoring
ZZ = PINC;
switch (ZZ)
{
case 0b11100111:
/* turning on T6 and T5 for 001 output */
digitalWrite(9,LOW);
digitalWrite(10,LOW);
digitalWrite(8,HIGH);
pinMode(2,INPUT);
pinMode(5,INPUT);
pinMode(3,OUTPUT);
break;
case 0b11101011:
/* turning on T4 and T3 for 010 output */
digitalWrite(8,LOW);
digitalWrite(10,LOW);
digitalWrite(9,HIGH);
pinMode(2,INPUT);
pinMode(3,INPUT);
pinMode(5,OUTPUT);
break;
case 0b11101111:
/* turning on T4 and T5 for 011 output */
digitalWrite(9,LOW);
digitalWrite(10,LOW);
digitalWrite(8,HIGH);
pinMode(2,INPUT);
pinMode(3,INPUT);
pinMode(5,OUTPUT);
break;
case 0b11110011:
/* turning on T1 and T2 for 100 output */
digitalWrite(10,HIGH);
digitalWrite(8,LOW);
digitalWrite(9,LOW);
pinMode(3,INPUT);
pinMode(5,INPUT);
pinMode(2,OUTPUT);
break;
case 0b11110111:
/* turning on T1 and T6 for 101 output */
digitalWrite(8,LOW);
digitalWrite(9,LOW);
digitalWrite(10,HIGH);
pinMode(2,INPUT);
pinMode(5,INPUT);
pinMode(3,OUTPUT);
break;
case 0b11111011:
/* turning on T2 and T3 for 110 output */
digitalWrite(8,LOW);
digitalWrite(10,LOW);
digitalWrite(9,HIGH);
pinMode(3,INPUT);
pinMode(5,INPUT);
pinMode(2,OUTPUT);
break;
default:
digitalWrite(8,LOW);
digitalWrite(9,LOW);
digitalWrite(10,LOW);
pinMode(2,INPUT);
pinMode(3,INPUT);
pinMode(5,INPUT);
break;
}
}
else
{
// braking
ZZ = PINC;
switch (ZZ)
{
case 0b11100111:
/* PWM applied at T6, for 001 output */
digitalWrite(9,LOW);
digitalWrite(10,LOW);
digitalWrite(8,LOW);
pinMode(2,INPUT);
pinMode(5,INPUT);
pinMode(3,OUTPUT);
break;
case 0b11101011:
/* PWM applied at T4, for 010 output */
digitalWrite(8,LOW);
digitalWrite(10,LOW);
digitalWrite(9,LOW);
pinMode(2,INPUT);
pinMode(3,INPUT);
pinMode(5,OUTPUT);
break;
case 0b11101111:
/* PWM applied at T4, for 011 output */
digitalWrite(9,LOW);
digitalWrite(10,LOW);
digitalWrite(8,LOW);
pinMode(2,INPUT);
pinMode(3,INPUT);
pinMode(5,OUTPUT);
break;
case 0b11110011:
/* PWM applied at T2, for 100 output */
digitalWrite(10,LOW);
digitalWrite(8,LOW);
digitalWrite(9,LOW);
pinMode(3,INPUT);
pinMode(5,INPUT);
pinMode(2,OUTPUT);
break;
case 0b11110111:
/* PWM applied at T6, for 101 output */
digitalWrite(8,LOW);
digitalWrite(9,LOW);
digitalWrite(10,LOW);
pinMode(2,INPUT);
pinMode(5,INPUT);
pinMode(3,OUTPUT);
break;
case 0b11111011:
/* PWM applied at T2, for 110 output */
digitalWrite(8,LOW);
digitalWrite(10,LOW);
digitalWrite(9,LOW);
pinMode(3,INPUT);
pinMode(5,INPUT);
pinMode(2,OUTPUT);
break;
default:
digitalWrite(8,LOW);
digitalWrite(9,LOW);
digitalWrite(10,LOW);
pinMode(2,INPUT);
pinMode(3,INPUT);
pinMode(5,INPUT);
break;
}
}
}
// The code is under test
