Hi
The number of battery powered ride on vehicles that my kids have is increasing, along with the batteries to power them. The batteries are either 6v (12ah) or 12v (12ah). Links to the data sheets of the two batteries I'm "standardising" on are below.
12v/12ah http://www.yuasaeurope.com/images/uploads/eu/downloads/datasheets/NP/NP12-12_English.pdf
6v/12ah http://www.yuasaeurope.com/images/uploads/eu/downloads/datasheets/NP/NP12-6_English.pdf
My starting point is one of these laptop based power supplies; primarily because I have one lying around not doing anything and secondly because I don't really like the idea of me messing with circuits with a mains voltage The supply should is capable of 6a@15v, so I think that should allow up to 4 charging channels without too many issues.
http://www.maplin.co.uk/Module.aspx?ModuleNo=43515#spec
From an earlier thread, I had a reference to this diagram http://forum.allaboutcircuits.com/attachment.php?attachmentid=21844&d=1281922846 which I think gives me a good basis for a charging circuit. Looking at teh diagram; I see three stages. The first being the input source and a "bridge rectifier" arrangement with 4 diodes. The middle section being the charging circuit and the third section (labels RSbat, BAT and RPbat) being a representation of the battery internals for the simulation (confirmation required?).
I think I can duplicate the middle section 4 times, each taking a feed from the same laptop power supply, and each having a set of leads that would then go to the battery to be charged.
Looking at the middle section, to be honest I don't really understand how it works ; however I'd like to add the following to it.
1. A rocker switch to switch between a 6v and 12v recharging (3 position with centre being off)
2. An LED to indicate that the battery is charging
3. An LED to indicate the battery is charged and in float charge
My end point would be to have a small box that I can plug the power supply into, with 4 charging circuits each having a rocker switch to control off/6v/12v and LEDs to indicate charge stage.
Any advice and help you can give me on this would be appreciated.
Thanks.
Nick.
The number of battery powered ride on vehicles that my kids have is increasing, along with the batteries to power them. The batteries are either 6v (12ah) or 12v (12ah). Links to the data sheets of the two batteries I'm "standardising" on are below.
12v/12ah http://www.yuasaeurope.com/images/uploads/eu/downloads/datasheets/NP/NP12-12_English.pdf
6v/12ah http://www.yuasaeurope.com/images/uploads/eu/downloads/datasheets/NP/NP12-6_English.pdf
My starting point is one of these laptop based power supplies; primarily because I have one lying around not doing anything and secondly because I don't really like the idea of me messing with circuits with a mains voltage The supply should is capable of 6a@15v, so I think that should allow up to 4 charging channels without too many issues.
http://www.maplin.co.uk/Module.aspx?ModuleNo=43515#spec
From an earlier thread, I had a reference to this diagram http://forum.allaboutcircuits.com/attachment.php?attachmentid=21844&d=1281922846 which I think gives me a good basis for a charging circuit. Looking at teh diagram; I see three stages. The first being the input source and a "bridge rectifier" arrangement with 4 diodes. The middle section being the charging circuit and the third section (labels RSbat, BAT and RPbat) being a representation of the battery internals for the simulation (confirmation required?).
I think I can duplicate the middle section 4 times, each taking a feed from the same laptop power supply, and each having a set of leads that would then go to the battery to be charged.
Looking at the middle section, to be honest I don't really understand how it works ; however I'd like to add the following to it.
1. A rocker switch to switch between a 6v and 12v recharging (3 position with centre being off)
2. An LED to indicate that the battery is charging
3. An LED to indicate the battery is charged and in float charge
My end point would be to have a small box that I can plug the power supply into, with 4 charging circuits each having a rocker switch to control off/6v/12v and LEDs to indicate charge stage.
Any advice and help you can give me on this would be appreciated.
Thanks.
Nick.