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| Message 2008-10-12 15:53:41 |
MAX712 Chargernomad13 says... Hey Folks,I'm looking to build a charger to charge a 14.4v 3800mAh pack. Well, I really want to charge 4 of these up. But, from what I can tell, charging NiMH packs in parallel is bad.. So, I though I could build 4 charging circuits and wire them in parallel using Diodes. I've read the Data sheet on the MAX712, and It looks like what I need. I want to be able to charge these packs at around 1.25 to 1.5Amps. Source voltage will be a 18v power supply with up to 8amps output. The circuit needs to be able to handle the load while charging.. The load can peak at around 1.7Amps. I thought about using larger batteries such as D's or F's.. However, charging multiple packs at the same time would yield a faster charge.. and the most mAh I can get with other cell's is either 10000mAh with D's or 14000mAh with the F's. 4 3800mAh packs gets me longer runtime. Any help would be appreciated! Thanks, Connor mfacen says... The datasheet for the MAX712 shows each cell's voltage exceeding 1.5V. The datasheet says that the input voltage must be at least 1.5V higher than the max battery voltage. You are charging 12 cells so you need an input voltage at least 20.1V.The IC has only a single input to detect when the battery is fully charged. Then you can't add more batteries with or without diodes. lats says... Quote: < dtmf 8870 | resistance > |
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