DEFINITE-POLARITY SUPPLY VOLTAGE GENERATOR WITH SAFE POLARISED ELEMENT FOR SWITCHING CRITICAL CIRCUITS Russian patent published in 2012 - IPC B61L23/16 

FIELD: transport.

SUBSTANCE: invention relates to railway ACS and telemetry systems and may be used in automatic warning systems. Proposed device comprises control channels, safety cascades, each being controlled by OK signals and incorporates additionally safety cascade switch state control circuits. Signals from the latter are sent to processing channels and analysed therein. Electromagnetic relay with reference voltage of definite polarity makes output device. To prevent random operation, relay excitation passes via optical relay provided voltage exists thereat from matrix state controller output module and availability of control signal from processing unit first set. Polarity second inverter output is connected to DC electromagnetic relay working winding while polarisation winding is connected to local supply source. In case faults exist in circuit and feeding of voltage of polarity other than required, relay will not attract relay armature to cut off warning signal feed.

EFFECT: higher safety.

3 cl, 1 dwg