Electronics > Projects, Designs, and Technical Stuff
USB charger circuit for car
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Richard Crowley:
That circuit seems pretty vulnerable to normal vehicle power transients.

Automotive Line Transient Protection Circuit  http://www.ti.com/lit/an/snva717/snva717.pdf

https://www.eevblog.com/forum/projects/battery-protection-circuit/

Probably many more resources about vehicle power protection....
madires:
No need for over-engineering, a TVS diode (1.5KE or P6KE) would be sufficient.
Charybdis:

--- Quote from: Richard Crowley on April 05, 2019, 12:05:02 pm ---That circuit seems pretty vulnerable to normal vehicle power transients.

Automotive Line Transient Protection Circuit  http://www.ti.com/lit/an/snva717/snva717.pdf

https://www.eevblog.com/forum/projects/battery-protection-circuit/

Probably many more resources about vehicle power protection....

--- End quote ---

LOL, thank you for you reply: I'll take a look at the material you posted.
But this is what my 21years old glorious Car looks like.
I think that the circuit I'm building will be 20 years innovative than the rest of the stuff that's inside  ;D ;D ;D electrical engineer in Fiat didn't even put some relays on the headlights   :-\ and I'm going to fix this in few months
radiolistener:
I think there is needed for some kind of protection from high voltage pulses which may be present in the vehicle power line.
These pulses may be up to kilovolts, and it may damage expensive iPhone with no protection from high voltage pulses.
Charybdis:

--- Quote from: madires on April 05, 2019, 01:41:21 pm ---No need for over-engineering, a TVS diode (1.5KE or P6KE) would be sufficient.

--- End quote ---

Do you think that this 1.5KE15A  one will be fine ?

Type of diode    transil    
Power dissipation    1.5kW    
Max. off-state voltage    12.8V    
Breakdown voltage    15V    
Max. forward impulse current    71A    
Semiconductor structure    unidirectional

I modified the circuit with the diodes mentioned. Are they in the correct position ?
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