Summary of NoLoop – Serial and SPI isolator Breaking ground-loops with galvanic isolation
This article explains how ground loops and coupling issues cause voltage differences in electronic interconnections, potentially damaging devices. It highlights the risks of connecting computers and peripherals without isolation. The solution presented is NoLoop, a galvanic isolator designed to break ground loops by separating signal and power connections between input and output, ensuring safe operation by preventing common-mode currents and differential voltages.
Parts used in the NoLoop Project:
- NoLoop galvanic isolator
- Signal connection path
- Power connection path
- Ground loop components
Electronics work by interconnections. Normally, you’d think that a potential at one point on a wire is the same everywhere. However, that is (mostly) not the case and all kinds of aspects can pop up that make the potentials differ at different locations.
Old-timers may remember connecting a printer to a computer and getting zapped by the connector when touching both computer and printer at the same time. You’d expect both ground-levels of the computer and the printer to be at the same level, but they are not (due to capacitive/inductive coupling). The problem is much wider than the printer on a computer. Any connection you make may give rise to:
- ground-loops
- common-mode couplings
- inductive/capacitive couplings
The most important in simple electronics is the ground-loop. A ground-loop is the problem where multiple paths exist for ground currents to flow. Especially when there are high- and low-current paths, then interconnections between the grounds may exhibit quite large differential voltages, due to DC-resistance of the wiring. It should be noted that multiple low-current paths may also cause immense problems.
It is easy to imaging that, if your computer is part of such a ground-loop, then it may take permanent damage. Also other electronics take damage because signal levels are not there where they are supposed to be. You have to break the ground-loop to solve the problem.
NoLoop is a galvanic isolator for both signal and power connections. NoLoop separates the in- and out-put breaking any existing of a ground-loop in that connection path.
For more detail: NoLoop – Serial and SPI isolator Breaking ground-loops with galvanic isolation
- What causes potential differences at different locations on a wire?
Capacitive and inductive coupling can make potentials differ at various points. - Why do ground-loops occur in electronics?
They happen when multiple paths exist for ground currents to flow. - How do high-current and low-current paths affect ground connections?
Interconnections between them can exhibit large differential voltages due to DC-resistance. - Can a computer be damaged by a ground-loop?
Yes, if a computer is part of such a loop it may take permanent damage. - What is the primary function of NoLoop?
NoLoop acts as a galvanic isolator for both signal and power connections. - How does NoLoop solve the ground-loop problem?
It separates the input and output to break any existing ground-loop in that connection path. - What types of couplings are mentioned as problems in interconnections?
The text lists ground-loops, common-mode couplings, and inductive/capacitive couplings.
