Patent ID: 7208851
Filing Date: 2007-04-24
Classification: H02M,H03K

Abstract:
1. A circuit arrangement for the reliable switching of electrical circuits, in a lead to a current load ( 3 ), comprising a first series path ( 1 , 2 ), which electrically connects a first input point ( 4 , 5 ) to a first output point ( 6 , 7 ), and a second series path ( 1 , 2 ) which electrically connects a second input point ( 4 , 5 ) to a second output point ( 6 , 7 ), characterized in that at least two switching elements ( 11 , 12 ) are arranged in parallel with one another in at least one of the series paths ( 1 , 2 ), the switching inputs ( 20 ) of said switching elements being connected to the input point of the series path ( 4 , 5 ) and the the switching outputs ( 21 ) of said switching elements being connected to the input side of a respective winding ( 8 , 9 ) of a transformer ( 10 ), and the output sides of the windings ( 8 , 9 ) are connected to one another and to the output point of the series path ( 6 , 7 ), and the windings of the transformer are embodied such that the magnetic field strengths ( 17 , 18 ) of the two component currents ( 15 , 16 ) of the load current ( 14 ) in the transformer ( 10 ) act oppositely to one another, and a capacitance ( 13 ) is connected across the output points ( 6 , 7 ) of the series paths ( 1 , 2 ) to be charged after the switching elements ( 11 , 12 ) are closed, and then discharged when one of the switching elements ( 11 , 12 ) is opened to provide current to a load and to allow opening of the switching elements in a low-voltage, low-current state.