|Posted: Sun Oct 20, 2019 10:29 am Post subject: Desulfinating trickle charger with Garmin avionics
The high voltage spike to desulfurize doesn't have to produce high current to damage something. Transistors, for example are two conductors sandwiching an insulator that is modulated by a control voltage to control the current between the two conductors. If a high voltage spike comes in on the power supply, it leads to one of the conductors and can cause punch through, meaning that it can chip away at it until only a percentage of it left. That causes the transistor to no function according to its specifications and can lead to either a complete failure or partial failure. It is these partial failures that cause anomalies in circuits that are hard to troubleshoot.
Think of these two conductors and the sandwiched insulator as a PNP or NPN. Even a diode can get chipped away or totally blown away. Capacitors also have dielectrics that can be damaged. There are all sorts of anomaly producers in a typical circuit board.
This is one reason why I don't really like the fancy battery chargers. I'd rather keep my batteries topped off frequently to avoid sulfurization. And of course I don't have that problem in my vehicles, because that dumb regulator does a great job of topping off the battery that never really goes below 90%.
On Sunday, October 20, 2019, 01:27:50 PM EDT, James kale <jimkale(at)roadrunner.com> wrote:
--> AeroElectric-List message posted by: "James kale" <jimkale(at)roadrunner.com (jimkale(at)roadrunner.com)>
Most desulfurization circuits send an occasional high voltage spike down the
charger leads. This only lasts for a few milliseconds. However, the high
voltage spike could lead to a couple of milliseconds of high current. This
should not damage most fuse/circuit breakers, however, there might be some
out there that could be damaged.
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