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Looking for pwm signals h520e

Joined
Jul 8, 2021
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Hi all
I’am looking for pwm signal on my h520e. I thought pwm signal was where I surrounded in my attachment file but I don’t have any signal here.
I checked every pin on stm32f301 but I haven’t found any pwm signal.
I can only found a square signal on each power mosfet at 20kHz
 

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  • D90962A8-904C-4EAE-A4BE-F4BB8C55B4C9.jpeg
    D90962A8-904C-4EAE-A4BE-F4BB8C55B4C9.jpeg
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One earlier models, the PWM circuit would show ~1.5 volts. But it is an actual PWM code. You can't see the code unless you hook it to an oscilloscope. And that doesn't do much good if you don't have a known good code available for comparison. I've never experimented with H520 or H520e.
 
Thanks for your reply. I have an oscilloscope. But I have searched everywhere in the board and I can’t find any pwm signal it’s so strange. I have checked every pin on the stm32 I can’t find a signal but he’s at 20kHz it’s too high for a pwm no? I found the same signal on each 3 power mosfet 20kHz.
in my attachment file you have a part for one motor. We can see stm32, 3 power mosfet at the top with 3 wires going to the motor (red, black, bule)
 

Attachments

  • BB530D7B-5073-4985-B313-DC94030CB01C.jpeg
    BB530D7B-5073-4985-B313-DC94030CB01C.jpeg
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