Patent ID: 6920027
Filing Date: 2005-07-19
Classification: H02H,Y02E

Abstract:
1. A device for control of electric current, comprising: a plurality of stages, whereupon a stage consists of a primary coil and a secondary coil wound around a saturating core and magnetically coupled, and a primary coil and a secondary coil wound around another saturating core and magnetically coupled; said primary coils connected in series; said secondary coils connected in parallel via a means for fully or partially interrupting secondary current; under normal conditions some of the current flowing through a primary coil is diverted through the secondary circuit consisting of the secondary coils and reintroduced through another of the primary coils, producing no overall affect on primary current; upon operation of means for interrupting secondary current, the inductive impedance of both primary coils reduces the current flow through the primary coils; said stages connected in series via primary coil pairs and forming a primary section for coupling the device to electric circuit; operation of single stages causing their cores to saturate and producing low inductive impedance on the primary circuit; operation of multiple stages bringing individual cores out of saturation due to less voltage across each stage and producing higher inductive impedance on the primary circuit.