Patent ID: 6946829
Filing Date: 2005-09-20
Classification: G01R,H02M

Abstract:
1. A device for measuring a chopped current (i e ), the device comprising firstly a pulse transformer ( 10 ), the transformer comprising a primary circuit ( 12 ) in which the chopped current flows and a secondary circuit ( 14 ) in which there flows an output current (i s ) proportional to the chopped current, the secondary circuit of the transformer having two output terminals ( 16 , 18 ) between which there is connected an output current measuring circuit ( 22 ), and also means ( 20 ) for demagnetizing the transformer, the device being characterized in that the measuring circuit comprises a switch ( 32 , 34 ) and means ( 33 , 35 ) for synchronizing the switch with the chopped current (i e ) so as to enable the output current (i s ) to flow through the measuring circuit ( 22 ) whenever the chopped current is strictly positive and whenever it is strictly negative, and to prevent any flow of current through the measuring circuit whenever the chopped current is zero.