Author Topic: Electronic Modules  (Read 18099 times)

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Offline AliRezaJoodiTopic starter

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4~20mA Analog Input With A Relay Switch For Disable InputPicture:
« Reply #25 on: June 01, 2023, 06:18:44 pm »
4~20mA Analog Input With A Relay Switch For Disable Input

Picture:


Schematic:


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

If we turn off a board power supply while a ADC input connect to 4~20mA external source, The microcontroller does not turn off completely. 
So, after turn on the board power supply, the micro will behave unreliably. 
It was my experience about control board that use a ATmega2560 for induction furnace. I had to use a switch before ADC for disconnect the external source. 
I tested it for many times and worked great. 

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Offline AliRezaJoodiTopic starter

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Protected 4~20mA Analog Input
« Reply #26 on: June 03, 2023, 07:59:12 am »
Protected 4~20mA Analog Input

Simulate:


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

A circuit that design by Jefferson Pehls for Protection a 4~20mA Current Input.
I just tried to understand it in Proteus.

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Source Link (Jeferson Pehls): https://www.linkedin.com/feed/update/urn:li:activity:7042709425547001856/
 

Offline AliRezaJoodiTopic starter

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Re: Electronic Modules
« Reply #27 on: June 04, 2023, 09:27:23 am »
Isolated High Power Full-Bridge Inverter with MOSFET Switches

Schematic:


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

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Offline AliRezaJoodiTopic starter

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IR Sender and Receiver
« Reply #28 on: June 12, 2023, 09:38:59 am »
Electronic Modules
IR Sender and Receiver
Open-source link: GitHub.com/AliRezaJoodi/Electronics_Modules
==> IR_Sender



==> IR_Receiver



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« Last Edit: June 25, 2023, 06:33:49 am by AliRezaJoodi »
 

Offline floobydust

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Re: Electronic Modules
« Reply #29 on: June 13, 2023, 02:43:02 am »
Isolated High Power Full-Bridge Inverter with MOSFET Switches

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

Why are you pulse stretching with C4, C5? You don't want overlap in a full bridge or it goes boom. What PWM frequencies is this bridge good for at 300VDC?
 
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Offline f4eru

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Re: Electronic Modules
« Reply #30 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



« Last Edit: June 14, 2023, 10:40:39 pm by f4eru »
 
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Offline AliRezaJoodiTopic starter

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Re: Electronic Modules
« Reply #31 on: June 15, 2023, 06:33:43 pm »
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)
« Last Edit: June 15, 2023, 06:45:21 pm by AliRezaJoodi »
 

Offline AliRezaJoodiTopic starter

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Re: Electronic Modules
« Reply #32 on: June 15, 2023, 06:51:37 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

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

Offline ArdWar

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Re: Electronic Modules
« Reply #33 on: June 18, 2023, 03:45:47 pm »
"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.
 
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Offline AliRezaJoodiTopic starter

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External WatchDog for AVR Microcontrollers
« Reply #34 on: June 25, 2023, 06:41:27 am »
External WatchDog for AVR Microcontrollers

Picture:


Schematic:


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

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Offline AliRezaJoodiTopic starter

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Dialing on the Phone Line
« Reply #35 on: July 18, 2023, 12:17:19 pm »
Dialing on the Phone Line
Open-source link: GitHub.com/AliRezaJoodi/Electronics_Modules
==> PhoneLine_Dialing

Picture:


Schematic:


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