Method for loosening the contacts of a sticking relay as well as circuit arrangement for carrying out the method
AssigneeBayerische Motoren Werke Aktiengesellschaft
InventorNorbert Nickolai
Life of this patent
Estimating the term…
Abstract
A method for releasing the contacts of a sticking relay by sensing whether or not the relay contacts stick together in a closed condition and when the contacts stick together, applying an AC voltage on pulsating DC voltage to the winding of the relay coil. The mechanism for sensing the sticking relay contact condition is a comparator to compare the output load of the relay with the exciting control signal to energize the relay coil.
Claims14
A method for releasing the contacts of a sticking relay, whose one contact is locally fixed and whose other contact is arranged at a ferromagnetic relay armature which is attracted with its contact toward the locally fixed contact by application of an electric voltage control signal to the winding of the relay coil and which in the de-energized condition of the relay coil, with an intact relay, again drops off whereby the two contacts are again separated from one another, comprising the steps of sensing if the one and other contacts stick together, and applying an AC or pulsating DC voltage to the winding of the relay coil when the one and other contacts stick together.
A circuit arrangement for releasing the contacts of a sticking relay whose one contact is locally fixed and whose other contact is arranged at a ferromagnetic relay armature which is attracted with its contact toward the locally fixed contact by applying an electric voltage control signal to the winding of the relay coil and which in the de-energized condition of the relay coil the two contacts are again separated from another, comprising first means for sensing if the one and other contacts stick together, and second means for applying an AC or pulsating DC voltage to the winding of the relay contact when the contacts stick together as sensed by said first means.
Dependencies are inferred from the claim text.