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https://enerdrive.com.au/2014/09/11/dc-to-dc-converters-explained/
It is not surprising that confusion arises! Exactly WTF are they trying to say here:
Quote:
Hence a step-up dc-dc converter will reduce the input current level to a lower value at the output in the same proportion that it raises the value of the input voltage
Hence a step-up dc-dc converter will reduce the input current level to a lower value at the output in the same proportion that it raises the value of the input voltage.
Yes, it sounds daft, but it is not really as daft as it sounds. The DC-DC converter doesn't MAKE any electricity, it CONVERTS it. Therefore the ELECTRICAL POWER at the output will be the same as the ELECTRICAL POWER at the input, less a small percentage for losses. Power is made up of VOLTAGE multiplied by CURRENT. There will be power (voltage and current) at the input, and power (voltage and current) at the output. The converter in effect converts one lot of power (voltage x current) into a different lot of (equal) power (voltage x current) but the RATIO of voltage to current changes between input and output. Thus the output typically will have MORE voltage but LESS current at the output than on the input. The power is the same.Quote:
Originally Posted by Old Farang
This allows for compensation for voltage dropped between the alternator and the DC-DC converter, and it also allows for tailoring of the output voltage to suit different battery chemistries.
The current spec for the DC-DC converter is simply a measure of how powerful the converter is, but it has the side benefit of LIMITING the amount of current taken from the alternator, thus helping to prevent premature alternator failure.
Really? Hmm, I'm sure drivesafe will have something to add to that!Quote:
The current spec for the DC-DC converter is simply a measure of how powerful the converter is, but it has the side benefit of LIMITING the amount of current taken from the alternator, thus helping to prevent premature alternator failure.
I am more than well aware of what it is designed to do. My post refers to writing gibberish about something that can be explained in simple term without confusion.
Nop, his B/S knows no bounds, and I’ll not waste everybody’s time addressing it.Quote:
Originally Posted by Old Farang
I totally agree with your post. Their “statement” is more confusing than helpful!
Sorry Old Farang, when you wrote "It is not surprising that confusion arises! Exactly WTF are they trying to say here:" I thought you were asking a question.Quote:
Originally Posted by Old Farang
And therefore taking a lot longer to charge a battery in a low state of charge,than using a VSR.Quote:
Originally Posted by Silenceisgolden
In a modern vehicle,such as a D4 with a 180Amp alternator,it would take a hell of a lot of current to overload the alternator.Even so the alternator will limit the current.If it did happen,this would only occur for a short time,so the chance of damaging the alternator is more than likely negligible.
The main cause of failure of alternators is heat,dirt,mud and water,and failure of the diodes,over time.
Absolutely correct!Quote:
Originally Posted by scarry
Errr... Scarry, what causes the diodes to fail?
Wear and tare[biggrin][thumbsupbig]Quote:
Originally Posted by Silenceisgolden
Hint - google "causes of diode failure in alternators".Quote:
Originally Posted by scarry
No one needs to do any googling, Scarry has already posted up the CORRECT answer.Quote:
Originally Posted by scarry