speaking of car battery chargers...

**eccerr0r** · 02-14-2020, 12:54 PM

I suspect someday these car battery chargers will become as obsolete as vacuum tubes (since everyone would be driving electric cars that require power inputs rated in the kilowatts), but for now they still have their use.

Traditionally chargers are big heavy transformers with diodes...a fairly dumb device. I still have one. However I suspect, just like wall warts, people are all switching to... lightweight switching power supplies.

I recall seeing at WallyWorld they no longer have a line frequency transformer battery charger, and all were SMPS supplies now... are anyone still selling old fashioned transformer chargers?

How about those starter/charger "50A 100A 200A" supplies designed to boost starting as well?

**stj** · 02-14-2020, 01:14 PM

they wont be obsolete because 12v batteries are also used on generators, plant equipment such as compressors etc and loads of other stuff.

**diif** · 02-14-2020, 02:12 PM

I have one of the lithium jump packs. Powerful enough to start a completely dead 3L V6 Touareg. It also has USB and adjustable voltages for charging/powering a laptop.

**budm** · 02-14-2020, 03:46 PM

Even elecric cars have 12v lead acid batteries.
https://www.plugincars.com/why-do-el...er-129118.html

Even TESLA uses lead acid batteries :
https://forums.tesla.com/forum/forum...ithout-warning
https://forums.tesla.com/forum/forum...r-start-my-car

**eccerr0r** · 02-14-2020, 04:35 PM

Quote:

Originally Posted by budm

Even elecric cars have 12v lead acid batteries.

Don't tell me these aren't charged by the main pack...

**eccerr0r** · 02-14-2020, 04:36 PM

Quote:

Originally Posted by stj

they wont be obsolete because 12v batteries are also used on generators, plant equipment such as compressors etc and loads of other stuff.

But are they all SMPS now?

**sam_sam_sam** · 02-14-2020, 05:30 PM

The ones I seen that have no real weight to them are for sure a SMPS board

**Curious.George** · 02-14-2020, 06:39 PM

Quote:

Originally Posted by budm

Even elecric cars have 12v lead acid batteries.

For some years, now, there has been a push to move to 48V systems in cars -- mainly to cut down on wire gauge (without also needing dramatically costlier semiconductors). Imagine the turbocharger being electrically driven (instead of off the camshaft).

Though I still think they plan on retaining a 12V bus for things like interior lighting, instrumentation, etc.

**petehall347** · 02-14-2020, 07:12 PM

Quote:

Originally Posted by Curious.George

For some years, now, there has been a push to move to 48V systems in cars -- mainly to cut down on wire gauge (without also needing dramatically costlier semiconductors). Imagine the turbocharger being electrically driven (instead of off the camshaft).

Though I still think they plan on retaining a 12V bus for things like interior lighting, instrumentation, etc.

turbo runs off exhaust gases

**Curious.George** · 02-14-2020, 07:27 PM

Quote:

Originally Posted by petehall347

turbo runs off exhaust gases

Depends on the design of the turbocharger.

A friend makes them (after-market) in his tool-and-die shop gearing up off the crankshaft so he can get it up to speed at relatively low RPMs (you have power despite revs). And, easy to retrofit to almost any vehicle.

The advantage of an *electric* turbocharger is you can get it up to speed before the engine is doing anything!

**stj** · 02-14-2020, 11:08 PM

https://www.youtube.com/watch?v=7a_J2X88fSE
there;s one

02-14-2020, 12:54 PM	#1
eccerr0r Solder Sloth Join Date: Nov 2012 City & State: CO My Country: USA Line Voltage: 120VAC 60Hz I'm a: Hobbyist Tech Posts: 4,643	speaking of car battery chargers... I suspect someday these car battery chargers will become as obsolete as vacuum tubes (since everyone would be driving electric cars that require power inputs rated in the kilowatts), but for now they still have their use. Traditionally chargers are big heavy transformers with diodes...a fairly dumb device. I still have one. However I suspect, just like wall warts, people are all switching to... lightweight switching power supplies. I recall seeing at WallyWorld they no longer have a line frequency transformer battery charger, and all were SMPS supplies now... are anyone still selling old fashioned transformer chargers? How about those starter/charger "50A 100A 200A" supplies designed to boost starting as well?

02-14-2020, 01:14 PM	#2
stj Great Sage 齊天大聖 Join Date: Dec 2009 City & State: Europe My Country: some shithole run by Israeli agents I'm a: Professional Tech Posts: 22,168	Re: speaking of car battery chargers... they wont be obsolete because 12v batteries are also used on generators, plant equipment such as compressors etc and loads of other stuff.

02-14-2020, 02:12 PM	#3
diif Badcaps Veteran Join Date: Feb 2014 City & State: Midlands My Country: England I'm a: Professional Tech Posts: 4,553	Re: speaking of car battery chargers... I have one of the lithium jump packs. Powerful enough to start a completely dead 3L V6 Touareg. It also has USB and adjustable voltages for charging/powering a laptop.

02-14-2020, 03:46 PM	#4
budm Badcaps Veteran Join Date: Feb 2010 City & State: S.F. Bay area My Country: USA Line Voltage: 120V 60Hz I'm a: Knowledge Seeker Posts: 36,998	Re: speaking of car battery chargers... Even elecric cars have 12v lead acid batteries. https://www.plugincars.com/why-do-el...er-129118.html Even TESLA uses lead acid batteries : https://forums.tesla.com/forum/forum...ithout-warning https://forums.tesla.com/forum/forum...r-start-my-car __________________ Never stop learning Basic LCD TV and Monitor troubleshooting guides. http://www.badcaps.net/forum/showthr...956#post305956 Voltage Regulator (LDO) testing: http://www.badcaps.net/forum/showthr...999#post300999 Inverter testing using old CFL: http://www.badcaps.net/forum/showthr...er+testing+cfl Tear down pictures : Hit the ">" Show Albums and stories" on the left side http://s807.photobucket.com/user/budm/library/ TV Factory reset codes listing: http://www.badcaps.net/forum/showthread.php?t=24809 Last edited by budm; 02-14-2020 at 04:01 PM..

02-14-2020, 05:30 PM	#7
sam_sam_sam Badcaps Veteran Join Date: Jul 2011 City & State: Sunny Jacksonville FL My Country: USA Line Voltage: 120 Volts 60 HZ I'm a: Knowledge Seeker Posts: 1,868	Re: speaking of car battery chargers... The ones I seen that have no real weight to them are for sure a SMPS board __________________ 9 PC LCD Monitor 6 LCD Flat Screen TV 30 Desk Top Switching Power Supply 10 Battery Charger Switching Power Supply for Power Tool 6 18v Lithium Battery Power Boards for Tool Battery Packs 1 XBox 360 Switching Power Supply and M Board 25 Servo Drives 220/460 3 Phase 6 De-soldering Station Switching Power Supply 1 Power Supply 1 Dell Mother Board 15 Computer Power Supply 1 HP Printer Supply & Control Board * lighting finished it * These two repairs where found with a ESR meter...> Temp at 50F then at 90F the ESR reading more than 10% 1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later ) 2 Hem Saw Computer Stack Board All of these had CAPs POOF All of the mosfet that are taken out by bad caps

02-14-2020, 11:08 PM	#11
stj Great Sage 齊天大聖 Join Date: Dec 2009 City & State: Europe My Country: some shithole run by Israeli agents I'm a: Professional Tech Posts: 22,168	Re: speaking of car battery chargers... https://www.youtube.com/watch?v=7a_J2X88fSE there;s one

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