Sunday, January 31, 2010

N-Channel Mosfet Panel Solution

So the load switch schematic from yesterday worked but it required power from the microcontroller to switch on. So that didn't solve my problem of having the panel on even if the battery and microcontroller are dead.

Here's today's solution. I'm pretty sure this will work. It uses an N-Channel mosfet, cheaper and less resistance, instead of a P-Channel. I use the power coming from the panel to turn the mosfet on, then turn it off by sinking it to ground via a npn bjt transistor controlled by the microcontroller. It's too late for any sun testing today but hopefully I'll get this soldered up tonight.



Schematic for N-Channel mosfet solution.









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