UM1561 datasheet(11/39 Pages) STMICROELECTRONICS

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UM1561

STM32F1xx - internal peripherals for DC-AC section

Doc ID 023556 Rev 1

11/39

STM32F1xx - internal peripherals for DC-AC section

The DC-AC converter is managed by one PWM timer and a GPIO pin, synchronized in order

to control two legs of the inverter at different switching frequencies. The advanced PWM

timer, TIM8, is used to control the high frequency leg, and the GPIO pin for the low

frequency leg. Only one output of the TIM8 is used and the same is true for the GPIO

peripheral. The advanced timer is configured in center alignment mode in order to trigger

the ADC at the up-counting of the counter. Figure 4 shows the PWM mode and the trigger

events for ADC.

Figure 4.

Center alignment mode for TIM8 timer and trigger event for ADC

DataSensing.c

void DS_TIMx_Configuration(void)

{

TIM8 Configuration: PWM1 Mode

TIM_TimeBaseStructure.TIM_Period = ((DataSensing.Init.Counter) >> 1);

TIM_TimeBaseStructure.TIM_Prescaler = 0;

TIM_TimeBaseStructure.TIM_ClockDivision = 0;

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned1;

TIM_TimeBaseStructure.TIM_RepetitionCounter = 1;

TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);

TIM_SelectOutputTrigger(TIM8, TIM_TRGOSource_Update);

}

where

●

TIM_SelectOutputTrigger(TIM8, TIM_TRGOSource_Update);

is (Set the

TIM8 output for ADC triggering).

The DS_TIMx_Configuration includes the configuration code for the advanced timer TIM8.

The counter value (DataSensing.Init.Counter) is defined inside the DCDC_Converter.h file.

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