Inductive coupling
From Wikipedia, the free encyclopedia
In electrical engineering, two conductors are referred to as inductively coupled when they are configured such that change in current flow through one wire induces a voltage across the ends of the other wire.
The two conductors may be physically contained in a single unit, as in the primary and secondary sides of a transformer, or may be separated as in the antennas on a transmitter and a receiver. Coupling may be intentional or unintentional.
Unintentional coupling is called cross-talk, and is a form of interference. Inductive coupling favors low frequency energy sources. High frequency energy sources generally use capacitive coupling.
An inductively coupled transponder comprises an electronic data carrying device, usually a single microchip, and a large coil that functions as an antenna. Inductively coupled transponders are almost always operated passively.
[edit] Implementations
Devices that use inductive coupling include:
- Transformer for AC power coupling and inductive charging
- Graphics tablet
- Radio Frequency Identification
- Inductive Modems
- Wireless energy transfer
- A variety of inductive charging products charge batteries using inductive coupling, such as eCoupled.
[edit] Low frequency induction
Low frequency induction is an unwanted form of inductive coupling, which can occur when a metallic pipeline is installed parallel to a high-voltage power line. The pipeline, which is a conductor, and is insulated from the earth by its protective coating, can develop voltages which are hazardous to personnel operating valves or otherwise contacting the pipeline.
