Abstract: A gate drive circuit for switching a semiconductor switch of an inverter is provided, the gate drive circuit comprising operating means designed to alternate an electrical gate quantity between a maximum gate quantity value and a minimum gate quantity value in order to switch the semiconductor switch, the operating means being further designed to, at an adjustment time point during an operating interval, adjust said maximum gate quantity value to an adjusted maximum gate quantity value, to further alternate said electrical gate quantity between said adjusted maximum gate quantity value and said minimum gate quantity value to switch the semiconductor switch.

Abstract: A camera system (2) for strip-shaped exposure of a bank note (BN) having good optical properties as well as a compact construction has, symmetrically to an optical axis (OA), mirror assemblies (4a, 4b) of elliptical cross section each extending in the direction of the illuminated strip, light sources formed by LED arrays (6a, 6b), an imaging optic in the form of a SELFOC® lens assembly (8), and a photodetector array (12) onto which the illuminated strip of the bank note (BN) is imaged by the SELFOC® lens assembly (8) in a 1:1 ratio.

Abstract: A camera system (2) for strip-shaped exposure of a bank note (BN) having good optical properties as well as a compact construction has, symmetrically to an optical axis (OA), mirror assemblies (4a, 4b) of elliptical cross section each extending in the direction of the illuminated strip, light sources formed by LED arrays (6a, 6b), an imaging optic in the form of a SELFOC® lens assembly (8), and a photodetector array (12) onto which the illuminated strip of the bank note (BN) is imaged by the SELFOC® lens assembly (8) in a 1:1 ratio.

Abstract: An apparatus for testing sheet material includes an illumination device which illuminates the sheet material continually and in the total spectral region to be tested, and a receiving device having at least two linear parallel CCD arrays. A filter transmitting a certain spectral region is mounted on each CCD array. The individual filters are selected so that at least one transmits in the visible spectral region and one in the invisible spectral region. For detection of the light diffusely reflected or transmitted by the sheet material, the individual CCD arrays produce electric signals from the received light which are then processed in an evaluation device and compared with reference data for testing the sheet material.