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f4eru:
Seems intended to do stretching the OFF state of the MOS.

But really poor bridge design. A really good example of all things what not do do at 300V.
- slow optos
- too Hi-Z gate drive make it even slower.
- no good handling of transients during startup of the charge pumps
- Bipolar PWM means really crappy efficiency
- no mention of output filters, load type, nor bootstrap supply
- generation of VDD2 probably compromised at startup by the huge bootstraps charging without real current limits
- discharged C4, C5 generate a short circuit transient to the MOS gates at power up of the 5V -> funny one.
- no UVLOs on gate drivers
- no rail filtering
- no protection, current limit
- LEDs of optos directly in paralell.
......

If it is found to work, it would be a pure luck kind of situation depending on environment.
Each one of those points is easily capable to generate an EMS event (Explosive Magic Smoke).
Please learn all those topics, and I strongly advise to use real half-bridge driver ICs

AliRezaJoodi:
It was my old archive for UPS.
The C4 and C5 is stretching the ON state of the MOS
SPWM frequency was under 20KHz (I'm not sure now. I didn't write it)

AliRezaJoodi:

--- Quote from: f4eru on June 14, 2023, 10:22:32 pm ---Seems intended to do stretching the OFF state of the MOS.

But really poor bridge design. A really good example of all things what not do do at 300V.
- slow optos
- too Hi-Z gate drive make it even slower.
- no good handling of transients during startup of the charge pumps
- Bipolar PWM means really crappy efficiency
- no mention of output filters, load type, nor bootstrap supply
- generation of VDD2 probably compromised at startup by the huge bootstraps charging without real current limits
- discharged C4, C5 generate a short circuit transient to the MOS gates at power up of the 5V -> funny one.
- no UVLOs on gate drivers
- no rail filtering
- no protection, current limit
- LEDs of optos directly in paralell.
......

If it is found to work, it would be a pure luck kind of situation depending on environment.
Each one of those points is easily capable to generate an EMS event (Explosive Magic Smoke).
Please learn all those topics, and I strongly advise to use real half-bridge driver ICs

--- End quote ---

Thank you for feedback  :-+
I'll study about it 

ArdWar:
"stretching the ON state" on both leg is probably the last thing you want to do on a bridge, let alone at 300V

How it didn't end up in a ball of plasma? You're lucky if it "only" ends up in smoke.

AliRezaJoodi:
External WatchDog for AVR Microcontrollers

Picture:


Schematic:


Open-source link: GitHub.com/AliRezaJoodi/Electronics_Modules
==> MCU_WatchDog

Please follow and star me:
GitHub Account: GitHub.com/AliRezaJoodi
LinkedIn Account: LinkedIn.com/in/AliRezaJoodi
Thanks

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