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183 results about "Direct component" patented technology

Z-Directed Variable Value Components for Printed Circuit Boards

A Z-directed variable value component for insertion into a printed circuit board while allowing electrical connection to internal conductive planes contained with the PCB. The Z-directed variable value component mounts in a printed circuit board (PCB) having a mounting hole having a depth D therein and a plurality of conductive traces and comprises an insulative body of a length L comprising a top surface; a bottom surface; a side surface between the top and bottom surfaces; a cross-sectional shape that is insertable into the mounting hole in the PCB; and a first and a second electrically conductive channels on the side surface with the first channel and second channel both extending from one of the top and bottom surfaces; a plateable strip disposed on the side surface intermediate the top and bottom surfaces; and a first and second conductor disposed within the body, the first conductor electrically connected to the first channel and one end of the plateable strip and the second conductor electrically connected to the second channel and the other end of the plateable strip. In one form the plateable strip is comprised of a resistive material. In another form the plateable strip is comprised of a material having an electrical characteristic that changes when plating is applied to the strip after installation of the Z-directed component in the mounting hole of the PCB.
Owner:LEXMARK INT INC

Method for preventing wrong differential protection of motor and transformer caused by induced inrush current

The invention discloses a method for preventing wrong differential protection of a motor and a transformer caused by induced inrush current. The method comprises the steps of detecting the direct component of each phase current of the motor and the transformer, if one phase or multiple phases are rapidly increased and each phase of differential current of differential protection is small than a starting fixed value in the afterward T1 time period, determining the condition that an outer fault and/or the induced inrush current occurs, and performing differential protection with the blocking ratio in the afterward T2 time period; during the blocking period, if the differential current and the phase current are synchronously rapidly increased, determining the internal fault and unblocking. The internal fault and induced inrush current (or external fault) can be distinguished by detecting whether the rapid increment of the direct current component of the phase current and the differential current occur synchronously or not, and the false operation of the ratio differential protection is prevented by a short blocking measure; if the internal fault occurs again in the blocking period, the unblocking is performed to handle the conversion fault. The method is simple, reliable and easy to realize, and the fixed value is still rectified as usual without affecting the sensitivity of the differential protection.
Owner:NR ELECTRIC CO LTD +1
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