INDUCTIVE CONTACTLESS SWITCH Russian patent published in 2016 - IPC H03K17/95 

FIELD: electricity.

SUBSTANCE: invention relates to inductive contactless switch intended for determination of an object in controlled area. Switch comprises a coil, a source of pulsed radiation to feed it into said coil with transmitted current pulses for period of time longer than length of said transmitted current pulses, and processing circuit to generate output signal based on obtained voltages, different depending on change of position of object. Said obtained voltages are induced in coil after periods of time of transmitting current pulses by attenuation of currents, previously flowing in object due to voltage induced by said coil. Processing circuit includes a damping circuit intended for suppression of signal duration less than a given time of disturbance said output signal and providing minimum time interval between two changes of said output signal is not below specified time of disturbance. Processing circuit is configured to generate an intermediate signal having two signal states, and feeding said intermediate signal to said damping circuit to generate said output signal. Damping circuit comprises at least one intermediate delay circuit signal at specified time of disturbance for each of said signal states.

EFFECT: reduced sensitivity to external disturbing fields.

11 cl, 8 dwg