Posted on December 27, 2014 at 13:38I'm using Channel 1&3 in TIM1 to generate 4 Complementary PWMs (PA8, PA10, PB13, PB15, STM32F401VC DISCOVERY) to control my FullBridge DC-DC Converter.
In overcurrent or overvoltage cases, the PWM should be shutdowned to protect the MOSFETs. I'm using the following codes in Read_ADC() Procedure to do that.
I wonder wheather these PWM Pin would be transfer to OpenDrain or connect to GND after shutdowned? And how could I connect GND for these Pins this case? This problem has influenced to the driver circuit and the MOSFETs very much.
Can anyone help me?
Thank you very much!!
// Check Max_Cur and Max_Vb to disable PWM
if ( Ir_Buf[Cur_Pos] > Max_Cur )
{
TIM1->CR1 &= (uint16_t)(~TIM_CR1_CEN);
TIM1->BDTR &= (uint16_t)~TIM_BDTR_MOE;
TIM1->CCER &= (uint16_t)~(TIM_CCER_CC1E | TIM_CCER_CC1NE | TIM_CCER_CC3E | TIM_CCER_CC3NE);
}
if (Vb_Buf[Cur_Pos] > Max_Vb)
{
TIM1->CR1 &= (uint16_t)(~TIM_CR1_CEN);
TIM1->BDTR &= (uint16_t)~TIM_BDTR_MOE;
TIM1->CCER &= (uint16_t)~(TIM_CCER_CC1E | TIM_CCER_CC1NE | TIM_CCER_CC3E | TIM_CCER_CC3NE);
}
