Patent ID: 7446583

Claim:
A switching arrangement for the controlled parallel switching of a first energy-storing electrolytic condenser (C 1 ) with a second energy-storing electrolyte condenser (C 2 ) in response to a switching signal supplied to a control input (VS), said first electrolytic condenser (C 1 ) has a capacity of at least 500 μF; said second electrolytic condenser has a likewise large capacity, the switching arrangement comprises an electronic switch formed by the main circuit of a semiconductor device being a field effect transistor (FT) with a gate electrode connected through an RC-type delay member to the control input (VS); wherein for protecting both the field effect transistor (FT) and the connected electrolytic condensers (C 1 , C 2 ) from the damaging effect of current surges appearing as switching transients but which, at the same time, affects the switching process only to the extent necessary for the protection, the rising of the current in said main circuit is delayed, wherein the delay is provided by two delay members, the first delay member is constituted by said RC-type delay member, the second delay member being an inductive element (L) connected in the main circuit of the field effect transistor (FT), the inductive element (L) is constituted by a conductor ( 10 ) of predetermined length surrounded by a high-frequency ferrite core ( 11 , 12 ); the delay effected by the RC member ensures only a fraction of the full switching delay.