StarTed
Senior Chief Petty Officer
- Joined
- Jul 14, 2015
- Messages
- 694
I looked for something already discussed regarding electrical noise and the theory behind it. I either missed it or failed to see it (its happened before). I have a background in metering AC electricity and see lots of similarities especially when there is a form of AC on the DC system. Alternators, ignitions, transmitting radios, depth finders and other added devices. What recently caught my attention was the addition of a PWM device to control a trolling motor. Pulsated DC has similar issues as AC so resistance is no longer the only current restriction, now impedance raises its nasty head. I am very familiar with Ohm's law and its various forms as well as Kirchhoff's laws but I could use some additional thoughts on this. I'm hoping this post will raise some discussion on theory as well as solutions tried and trued.
I hope to add a trolling motor to my boat at bottom feeder price and am interested in a PWM to control it. Here is a question - can the output from a PWM be filtered using a capacitor, an inductor or will it affect the output because of interference with the oscillator? Could I put a rectifier on the ground lead between the filter and the PWM to prevent any negative feedback? I'm assuming that the TM is not grounded causing a problem. I understand that the electrical system should be only grounded at one spot to prevent ground loops and that the hull of an aluminum boat should not be used as a ground conductor.
I'm looking for suggestions and the supporting theory. Feel free to chime in even if you don't have both the experience and theory, either will help.
I plan to later add thoughts about component additions and wiring methods to help reduce or eliminate electrical noise.
I hope to add a trolling motor to my boat at bottom feeder price and am interested in a PWM to control it. Here is a question - can the output from a PWM be filtered using a capacitor, an inductor or will it affect the output because of interference with the oscillator? Could I put a rectifier on the ground lead between the filter and the PWM to prevent any negative feedback? I'm assuming that the TM is not grounded causing a problem. I understand that the electrical system should be only grounded at one spot to prevent ground loops and that the hull of an aluminum boat should not be used as a ground conductor.
I'm looking for suggestions and the supporting theory. Feel free to chime in even if you don't have both the experience and theory, either will help.
I plan to later add thoughts about component additions and wiring methods to help reduce or eliminate electrical noise.