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Solid States Devices => solid state devices => Topic started by: dreamyear on January 14, 2013, 06:35:14 AM

Title: FREE electricity while charging battery
Post by: dreamyear on January 14, 2013, 06:35:14 AM



circuit diagram explanation




http://www.youtube.com/watch?v=uYvAP8Trb-o
Title: Re: FREE electricity while charging battery
Post by: e2matrix on January 14, 2013, 07:07:09 AM
Not sure why you think that is free.   you are paying for the 120 vac.  You are just doing 2 things with what's coming out of the socket.   If I put a pair of wires parallel directly on to the 120 vac outlet and hooked up a battery charger and charged a battery your laptop would still run but you'd be charging the battery a lot faster.  See my point?  Your laptop supply just happens to still be running even though it's probably running on pulsed DC rather than AC - which is likely because they build them to handle a lot of conditions such as crappy non-sine wave AC output from DC inverters in cars.   If you measure the actual output of your laptop adapter you'd see it's putting out less than it does when plugged in straight to the 120 vac.   Or put it on an o-scope to see the difference more clearly.   Sorry but I don't think you've got anything there to get excited about. 
Title: Re: FREE electricity while charging battery
Post by: Magluvin on January 14, 2013, 07:16:24 AM
Hey Dream

Nice. ;]

Do you have a multimeter to do some readings?

The charging of the battery, in series with the laptop power supply most likely causes a voltage drop in the line voltage to the laptop power supply.

The power supply may be able to work at lower than line voltage, but probably pulls more current to provide adequate output to the laptop.

So, to see if there is any savings, measure the line voltage and then current of the laptop PS alone connected to the wall. Then, measure the same with the battery charging circuit in series.

With these measurements you can calculate the total coming from the wall in both situations to see if there is a savings. Including the wattage being used to charge the battery.  ;]

Mags
Title: Re: FREE electricity while charging battery
Post by: Magluvin on January 14, 2013, 07:31:35 AM
Misquote
Title: Re: FREE electricity while charging battery
Post by: TinselKoala on January 14, 2013, 08:02:07 AM
Every modern laptop power supply nowadays is made to autodetect and run on Japanese, North American, and European mains voltage and frequency.

Running on 100 volts input with full power output is standard, no problem at all.