Trimming electrical potentiometer used in throttle position control - applying laser to adjust value at specific positions of sliding tap to give required characteristic

摘要

An electrical potentiometer has a track (3) with a series of chain resistors (5) parallel switched. The resistors are coupled by conductor sections (7) connected to the track and are formed on a semiconductor substrate (8). The ends of the track connect to the chain resistors and a supply voltage (UV). A slide element (21) moves along the track to provide a tapped voltage (Up). The adjustment of the potentiometer characteristic is carried out in a laser trimming operation in which a specific voltage to position characteristic is obtained. ADVANTAGE - Reduces characteristic deviations between potentiometer to be trimmed and previously trimmed one or master.