eem2am
Banned
car battery protection from overvoltage
Hello,
Cars use a battery which is charged by an alternator to supply the electrical facilities.
However, if many of the car’s electrical devices are turned off at the same time, then the alternator’s coils are engorged with energy and must dump this energy into the battery and external circuitry.
-This can result in “Automotive Load Dump” with voltages at the battery terminals going to as high as 80V.
“Automotive Load Dump” can be especially severe just after the car has been started.
All of the electrical devices in the car (eg lights, radio etc) must be protected from this 80V overvoltage.
That is, each circuit has its own transorbs etc.
-Instead of having to have such protection on every single circuit attached to the battery, would it not be preferable to simply put a big transient suppression circuit on the alternator and that forget about having to do it on all of the individual circuits connected to the battery?
It seems ridiculous that , for example, car headlights must be designed to withstand 80V overvoltage transients.?
Hello,
Cars use a battery which is charged by an alternator to supply the electrical facilities.
However, if many of the car’s electrical devices are turned off at the same time, then the alternator’s coils are engorged with energy and must dump this energy into the battery and external circuitry.
-This can result in “Automotive Load Dump” with voltages at the battery terminals going to as high as 80V.
“Automotive Load Dump” can be especially severe just after the car has been started.
All of the electrical devices in the car (eg lights, radio etc) must be protected from this 80V overvoltage.
That is, each circuit has its own transorbs etc.
-Instead of having to have such protection on every single circuit attached to the battery, would it not be preferable to simply put a big transient suppression circuit on the alternator and that forget about having to do it on all of the individual circuits connected to the battery?
It seems ridiculous that , for example, car headlights must be designed to withstand 80V overvoltage transients.?