360alaska
Well-known member
Hello all,
I'm trying to design a battery to replace the original lead acid with Lithium polymer. with inspiration from this article:
https://learn.adafruit.com/multi-cell-lipo-charging/fast-multi-cell-charger
Here is my design so far:
For the 5v regulator we'll use a self contained switching unit: http://www.newark.com/tracopower/tsr-1-2450/dc-dc-converter-non-iso-pol-1/dp/08R5932
The charge controller circuit will be the same as this: https://cdn.sparkfun.com/datasheets/Prototyping/SparkFun_Lipo_Charger_Basic-microUSB_v10.pdf
Basically, this guy will connect the batteries through a relay for operation and split them for individual charging. A 1n4001 diode prevents charging of the batteries in series and also drops the voltage to a level that won't hurt the Powerbook. For safety purposes, each Lipo battery will be equipped with a Battery management board in case of a failure and to prevent over-discharging. A comparator circuit will switch the batteries into charge mode whenever the combined voltage of the batteries is less than that of a plugged in power adapter(around 40-70% charge):
I'm trying to design a battery to replace the original lead acid with Lithium polymer. with inspiration from this article:
https://learn.adafruit.com/multi-cell-lipo-charging/fast-multi-cell-charger
Here is my design so far:
For the 5v regulator we'll use a self contained switching unit: http://www.newark.com/tracopower/tsr-1-2450/dc-dc-converter-non-iso-pol-1/dp/08R5932
The charge controller circuit will be the same as this: https://cdn.sparkfun.com/datasheets/Prototyping/SparkFun_Lipo_Charger_Basic-microUSB_v10.pdf
Basically, this guy will connect the batteries through a relay for operation and split them for individual charging. A 1n4001 diode prevents charging of the batteries in series and also drops the voltage to a level that won't hurt the Powerbook. For safety purposes, each Lipo battery will be equipped with a Battery management board in case of a failure and to prevent over-discharging. A comparator circuit will switch the batteries into charge mode whenever the combined voltage of the batteries is less than that of a plugged in power adapter(around 40-70% charge):
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