Charging circuit question

[Vince1]

Since there is no positive voltage to the center atomizer pole from the battery until you activate the switch, How does voltage from the charger get to the battery? Does it just magically jump the inactive switch and go to the battery or is there so kind of one way resistor built into the little circuit board?

 

[Zep--]

Wow..your right, I never thought about that.

I'm thinking there is a photo-electric or infrared switch in there that shines down the battery hole from the charger. I did notice something that looked like that when I ripped a battery apart to make my USB Passthrough.

Hmm..but that would not explain manual switch batterys...

Zep--

 

[Vince1]

My chargers only have an outer threaded part and a spring loaded center connector, No trickery there. It has to be something in the battery end/internal circuitry.

 

[first2di3]

I would assume that the programming on the circuit board was programmed so that if it got power from somewhere it would open the circuit to the battery so it could be charged... I know my 801 batterys blink a few times when I screw 'em on...

 

[opusMorian]

vince.cadc is correct. It a simple contact switch. When there is vacuum in the upper part of the switch, it twist and shorts two points. Nothing fancy.

 

[kender]

The circuit board is connected to the out put of the battery where it screws on at. When it senses voltage from the charger it directs it to the battery bypassing the switch.

 

[opusMorian]

HAha sorry. I was talking about the switch on the battery. Did not have my coffee yet. Anyways, there is a voltage sensing chip that detects when any device plugged into is below a certain voltage (if drops below around 2.5v), a positive charge is applied to the negative pole of the battery to charge it. The sensing circuit is constantly connected to the battery and when it detects acceptable voltage from the battery. Some charger detects current draw and when the battery is fully charged, its draw on the charging circuit will be low, then the charger stops.

 

[Vince1]

Thanks guys, So when voltage is applied from the charger to the battery connector the circuit opens to the battery?

 

[opusMorian]

Thanks guys, So when voltage is applied from the charger to the battery connector the circuit opens to the battery?

Yes, with the diode on the charger, it only flows one direction towards the battery. I actually need to take apart one to see what chips they are using.

 

[Tedar]

I've been thinking about a charger that could charge more than one battery at the time for a while. Maybe an idea for the modders here?

* I should search before posting *