Charging system for n64p

nos_slived · Post by **nos_slived** » Sat Apr 30, 2005 2:18 am

Encorporate a voltimeter, and hack the output so it will cut power at a certain level?

*o* · Post by ***o*** » Sat Apr 30, 2005 3:35 am

ill investigate that

this wil be hard......good new i found cheap rechareables $3 for 2 aa 2300Mah (USD$2)

Warrior_Rocker · Post by **Warrior_Rocker** » Sat Apr 30, 2005 10:02 am

the voltmeter is an option, but how on earth would u make it differentiate in voltage, unless u were using a analog one and made the niddle trip a wire....

Post by **gannon** » Sat Apr 30, 2005 10:34 am

nos_slived wrote:Encorporate a voltimeter, and hack the output so it will cut power at a certain level?

But still, you'd have to use a time to constantly turn the charger voltage on and off to measure the batteries.
I think I'm starting to understand how the original switch design I had would work. It measures the current being drawn. Once the batteries are fully charged they'll be using less current, and then you can switch

I think....

nos_slived · Post by **nos_slived** » Sat Apr 30, 2005 1:55 pm

gannon wrote:
nos_slived wrote:Encorporate a voltimeter, and hack the output so it will cut power at a certain level?
But still, you'd have to use a time to constantly turn the charger voltage on and off to measure the batteries.
I think I'm starting to understand how the original switch design I had would work. It measures the current being drawn. Once the batteries are fully charged they'll be using less current, and then you can switch

I think....

With a voltimeter, you could just have it switch off every few minutes, and check then. You probably could use a digital, because they probably use a BCD chip(or atleast some might). Find the right wires, and put a some transistors on them. Analog would be easier though. Your idea makes sense though.

*o* · Post by ***o*** » Sat Apr 30, 2005 3:14 pm

i have found a timing circuit kit it turns of power after whatever time you set

nos_slived · Post by **nos_slived** » Sat Apr 30, 2005 7:31 pm

I don't think he is really looking for a timer, I think he is looking for a monitoring circuit.

Warrior_Rocker · Post by **Warrior_Rocker** » Sat Apr 30, 2005 9:42 pm

i think ive figured it out, a semi complex diode circuit that inputs a low amp power to the batts when plugged in, and inputs a high amp power to the main power to the console//screen, so that the high amp runs the console, while the batts are charged, this would require two different chargers, but tucked away neatly in custom power adapter

Post by **gannon** » Sat Apr 30, 2005 10:14 pm

yeah, but that still doesn't prevent the batteries from overcharging

*o* · Post by ***o*** » Sat Apr 30, 2005 11:31 pm

well i will setup a monitor watch it and program the time it will work

Post by **gannon** » Sat Apr 30, 2005 11:48 pm

you can calculate the charge rate (which is normally set with a resistor) normally.
Here's a li-ion charger schematic that's pretty simple.

Before connecting the cells to the charger the max charging voltage has to be set
by adjusting P1 (2k potentiometer).
The max charging current is set by choosing the value of Rx.
Rx = 0.6 / max charging current

*o* · Post by ***o*** » Sat Apr 30, 2005 11:53 pm

wow good work

Warrior_Rocker · Post by **Warrior_Rocker** » Sun May 01, 2005 1:36 pm

well thats a neat circuit, however im not too worried about overcharging, i think a good solution is just to use a pre-existing battery pack, with its special circuittry, sorta like the ps1 battery pack becuae it could charge batteries properly when on ac power, and run off batteries properly when on battery power..??, thanx for all the help, i just think a batterypack that is designed for just this application would be ideal, plus then you dont have to worry about using the right kind of batteries, the right kind of circuit, and the right kind of charger