Adding Schottky Diode to fix the Naze32 V6a
Adding Schottky Diode to fix the Naze32 V6a reverse current
issue… by David HK July 2016
I bought a cheap clone Naze32 V6a from China, which does not
have the diode to prevent reverse current from the USB power-in to the BEC
power-in (either ESC or PDB).
If I wired the Naze32 5V BEC power-in from an ESC BEC
output, whenever I connect the Naze32 to my PC via the USB, I will noticed the
motor that is providing the 5V BEC power is twisting, because it is getting the
reversed current from the Naze32 (via the 5V power-in red wire).
If I wired the Naze32 5V BEC power-in from a PDB (which is my
current setup), whenever I connect the Naze32 USB port to my PC, my PC will
complain “USB port drawing too much current… etc” (or similar message), this is because the quite a lot of current from the PC USB port is being drew to the PDB via the Naze32 5V power-in (revised current), as my PDB also connecting the fpv
cam+vtx, and 2 LEDs. Normally this shouldn't happened if the Naze32 has a diode to prevent reverse current getting out via the 5V power-in port.
The above issue only happens in Rev6a of the Naze32 board.
A workaround is to power the Naze32 with a Lipo battery
first, and then connect the PC USB, so that the PDB is getting sufficient 5V voltage from the Lipo via PDB 5V out, hence no reversed current will happen.
Recently, I found a permanent fix, from this link:
So I visited my local electronic shop, they don’t have
the 1N5819 in the standard wire connector version, but they have the surface
mount SS14 version, which is the equivalent of 1N5819. It is very small, less than 3mm x 5mm, as you
can see it on my thumb below.
I cut the 5V power-in red wire and soldered the diode in between. Note that the connection is directional,
there are lines mark (or grey colour mark) at one end of diode, which is the cathode
end, this should be the output direction of the current flow (ie connect to the
Naze32 5V power-in). Here is what it
looked like of the connection (unfortunately I’ve already shrink-wrapped before
taking this photo, but I want to show you how small the diode is).
So
problem fixed! Period!
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