Isolating Battery Sources with Rectifiers

[DigiTan]

Hello,

I started **broken link removed**a while back involving an external battery source for graphing calculators. Basically, what I'm doing is augmenting the existing battery supply (6volts from 'AAA' batteries) with an external supply of 'AA' batteries. During this process, I predicted I'd need to isolate to battery packs--to keep the stronger pack from "dumping" power backwards into the weakest set. So I isolated them using twin rectifier diodes--type 1N3666 I think (no data).

This design is working well, but the Vdrop across my diodes is higher than I expected. Additionally, I'd like to expand this project to act as a plug-in battery charger.

I did a little Googling and **broken link removed** that suggested that there are specialized diodes that are designed for this application. Does anyone know what they're called, or where to order them?

 

[Sebi]

You can canibalizing from PC PSU a dual schottky diode.It can handle about 20A and the voltage drop with 1A current only about 150mV.

 

[ante]

Hi
If the space is tight this is an alternative: 10BQ015

Ante :roll: