Importance

Loading Importance Indicators...

Abstract

The present invention relates to systems and methods for power line communication primarily with refrigeration containers, where the communication to and from the containers is performed as modulated signals transmitted over the power line. It is the object of the invention to achieve effective communication to and from containers without risk of disturbance of the communication when a high number of containers are connected to the same power grid. This can be achieved if the systems comprise at least one module for power line communication, which module comprises means for transmitting the modulated signal to and from the power grid, which means comprises at least one magnetic core, which surrounds the power lines, which magnetic core comprises a secondary winding, which is connected to the power line communication system. It can hereby be achieved that there is no direct electrical connection to the power lines where these power lines pass through the communication module, hi this way, a total galvanic isolation towards the power lines will exist, and as such this will protect the module against a great part of the impairment that might exist on the power grid lines. This impairment could be high voltage sparks that otherwise could destroy or at least disturb the electronic circuit, hi the module, the use of safety circuits is as such partly avoided which safety circuits typically are used for short cutting high voltage sparks which are typically occurring over the grid where this high voltage is generated by in and out-coupling transformers.

Loading the Abstract Image...

First Claim