LVC/LVA for a 1 Cell LiPo?

[simplechamp]

Ding ding ding! We have a winner!

[zeropointbug]

Well, despite the diagram on the site showing one thing, I really disagree with you. Look at the labels, you are plugging the JST into two positives, does that make sense? Am I missing something?

I would agree that the large contact looks like it would be for TWO connections, but not according to the babels.

[rawfuls]

Oh thank god, finally.
Confusing as hell... Not for you, but definitely for me..
Thanks guys, I'll see if all else goes well, and if not..will still post back.. with pictures!

[rawfuls]

I believe my first couple diagrams, I screwed up completely, but the newer one, on Post #29:
http://www.rc-monster.com/forum/show...9&postcount=29

Make sense to me..
considering it's positive on one side, and has two common grounds?

[rawfuls]

Just to be safe, sent in an email to verify my diagram, we'll see what they say

[zeropointbug]

You don't have two common grounds, the whole sense of the term is "common", is exactly that, it is common to both source and load.

The only explanation is that the labeling is wrong, or the diagram they show with the product is wrong.

Do we need Brian in here for an opinion?

[rawfuls]

Originally Posted by zeropointbug

You don't have two common grounds, the whole sense of the term is "common", is exactly that, it is common to both source and load.

The only explanation is that the labeling is wrong, or the diagram they show with the product is wrong.

Do we need Brian in here for an opinion?

That's what I was thinking when I typed it


Oh BrianG!

[BrianG]

Originally Posted by zeropointbug

...Do we need Brian in here for an opinion?

lol, I saw the opening post and thought the device Neil posted was pretty straightforward.

In looking at the pic below, it should be pretty obvious that the battery + and load + are common.

[rawfuls]

Originally Posted by BrianG

lol, I saw the opening post and thought the device Neil posted was pretty straightforward.

In looking at the pic below, it should be pretty obvious that the battery + and load + are common.

Which would mean there are two grounds?


@Chadworkz: I thought the module would be supposed to be separate from th charger device, as in only the lipo, module, and a connector (for charging AND connecting to the device, but not at the same time)

[BrianG]

Two grounds? I think we are all making this a WHOLE lot more complex than it is. See the pic below.




They probably made it like this so that the "charger" also powers the circuit when it is plugged in, kinda like a laptop or whatever.

[Chadworkz]

Here...



It's wired up so that the charger charges the battery without the charge current entering the device, and so that the device is powered by the battery current, not the charge current. All this time it is monitoring the charge and discharge cut-off voltages.

[Chadworkz]

Here...



It's wired up so that the charger charges the battery without the charge current entering the device, and so that the device is powered by the battery current, not the charge current. All this time it is monitoring the charge and discharge cut-off voltages.

[BrianG]

Chad, I'm not seeing like that at all. I see it as the lipo + and charger/load + are connected to the large pad on the right. The lipo - is connected to the pad on the left. And the charger/load is connected to the middle pad. Essentially, the LVC just disconnects the - lead if an error occurs.

[Chadworkz]

Originally Posted by BrianG

Chad, I'm not seeing like that at all. I see it as the lipo + and charger/load + are connected to the large pad on the right. The lipo - is connected to the pad on the left. And the charger/load is connected to the middle pad. Essentially, the LVC just disconnects the - lead if an error occurs.

If the LiPo and Device positives are connected to the same pad, the LiPo will directly power the Device without passing through the Protection circuitry.

[BrianG]

Originally Posted by Chadworkz

If the LiPo and Device positives are connected to the same pad, the LiPo will directly power the Device without passing through the Protection circuitry.

Not if the grounds are seperate, which they are. Normally, you see circuit interruption in the + lead, but there is nothing wrong with switching the ground lead. In fact, that's how old-style dome lights are switched on via pin switches in older cars. Car horns operate in a similar way. Just depends on the application. Could just be a matter of the circuit using an NPN vs a PNP transistor to do the switch action...