STM32F4 Complementary PWM doesn't run correctly

[minhpc91]

Posted on January 19, 2015 at 17:40

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[minhpc91]

Posted on January 20, 2015 at 02:02

Can anyone help me, please?!

[Tesla DeLorean]

Posted on January 20, 2015 at 02:30

Can anyone help me, please?!

Not really, not my thing at all...

          TIM_OCInitStructure.TIM_OCIdleState        = TIM_OCIdleState_Reset; // Sure this isn't Set ?

          TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;

[minhpc91]

Posted on January 20, 2015 at 13:51

Thank you for your response.

I have tried disabling the PWM channel 3, 3N to test the other two only (PWM channel 1,1N ~ PA8, PB13), but the problem has still remained. The complementary feature doesn't work (the following picture). So complicated!!

Although dont think the idle feature isn't neccessary in this case, I have tried to SET it as you said, and the result is not better.

I use 50kHz TIM2 Interrupt for Calculation (ADC, Controller, update,...), and TIM1 for PWM (frequency and dutycycle vary; deadtime constant)

Can anyone help me, please?!

[Tesla DeLorean]

Posted on January 20, 2015 at 14:15

The scope traces look very odd, do the complementary outputs look right if the deadtime stuff is removed?

[minhpc91]

Posted on January 20, 2015 at 14:51

It is not better, Clive1. 

The overlap happens randomly when I run/stop my Oscilloscope.

I have no idea to do next. Haizz!! 

I can send to you all my project. Can you help me find out the problem?

[Tesla DeLorean]

Posted on January 20, 2015 at 15:06

I'm not looking to get that involved.

[minhpc91]

Posted on January 20, 2015 at 15:15

I just want to solve it. I'm sorry for bothering you, clive1.