CONTACTLESS POSITION SWITCH Russian patent published in 2003 - IPC

FIELD: electrical engineering. SUBSTANCE: proposed position switch designed for operation in 220-V dc circuits in explosion-safe media has printed circuit board that mounts circuit with two magnetic integrated circuits and two electronic switches built around field-effect transistors forming two identical independently functioning control channels. Integrated circuits having low hysteresis loop are used as magnetic integrated circuits. Printed-circuit board is disposed in explosion-safe case and permanent- magnet movable member is mounted beyond case. Two control channels are disposed so that operation takes place in extreme positions of permanent magnets. EFFECT: enhanced precision of positioning. 1 cl, 2 dwg