Patent ID: 8354811

Claim:
A switching circuit comprising: two power transistors ( 22 , 24 ) which are mounted in series; an excitation circuit ( 26 , 28 ) for exciting each transistor to obtain simultaneous switching of the two transistors, the excitation circuit ( 26 , 28 ) providing turn-on signals at the two power transistors ( 22 , 24 ) being simultaneous, and turn-off signals at the two power transistors ( 22 , 24 ) being simultaneous so that the two power transistors ( 22 , 24 ) simultaneously switch on and the two power transistors simultaneously switch off ( 22 , 24 ); means ( 30 ) for producing a corrective current (δi) for controlling one corrected control transistor ( 22 ) among the two transistors ( 22 , 24 ), in accordance with the difference in the temporal development of the voltage at the conduction terminals of the two transistors ( 22 , 24 ) which are mounted in series; and means ( 37 ) for applying the current to the grid electrode of the corrected control transistor ( 22 ), the means for applying the current comprising two capacitors ( 32 , 34 ; 132 , 134 ) which are connected to the conduction terminals of the two transistors ( 22 , 24 ), the two capacitors ( 32 , 34 ) being connected in series at outer conduction terminals of the two transistors ( 22 , 24 ), wherein the means ( 30 ) for producing a corrective current (δi) comprise means ( 37 ) for picking the corrective control current (δi), at the center point ( 36 ) between the two capacitors ( 32 , 34 ), the center point being a point on an electrical connector between the series-connected capacitors.