Is there a zero crossing detector inside the stm32 itself?

[MJavi.1]

Is there a zero crossing detector inside the stm32 itself?

I am using a stm32f334R8

[Peter BENSCH · Accepted solution]

Well, the STM32F334 may only process voltages between 0...VDD, for 5V-tolerant GPIOs also 5V signals under consideration of special instructions.

A real zero crossing detection is only possible if you shift the signal to be detected by an offset and use it to feed one of the three included comparators, for example. Alternatively, you can also do the zero crossing detection externally and feed it in digitally.

Does it answer your question?

Regards

/Peter

[MJavi.1]

Yeah very useful

Actually i want impelement a pll. By finding the phase shift between the pwm signal and the output of current transformer(ct) that i put on the output of my inverter.

Do you have any idea how can i find the phase shift just using ct signal?

Without measring voltage.

[Peter BENSCH]

Well, it should be no problem to measure the PWM with a timer (frequency, possibly also duty cycle) and then measure the time shift of the CT signal. The phase shift can then be calculated from the time shift relative to the PWM frequency.

Regards

/Peter

[MJavi.1]

Thank you so much

Is the any documentation i can use for implementing zero crossing detection?

[Peter BENSCH]

Zero crossing detection is a basic function, but can be realised in different ways depending on requirements and electrical conditions.

Your favourite seach engine should find plenty of suggestions with "zero crossing detection".

Regards

/Peter