Abstract
The article discusses the principles of construction and practical implementation of contactless bridging devices based on powered conversion circuits for point machines controlling in the micro- processor controller and microprocessor interlocking system with three-phase asynchronous motors and electromechanical train stop drives on railways and subways in the MPC-MPK microprocessor- based centralization system, developed by specialists of Petersburg State Transport University of Emperor Alexander I. The general principles of ensuring the safety of power modules that implement direct control of floor-level objects, the features of the construction of powered circuit engineering, as well as units that carry out the functions of monitoring the current state of controlled devices and checking the health of circuit lines are described. Particular attention is paid to the issues of logical processing of control signals, the formation of control actions for the power keys of the converter cir- cuit, the implementation of motor control using a three- and five-wire working circuit, control of the point operating gear position and the train stop drive mechanism using code signals. The questions of the practical implementation of the detection of breaks in the actuating circuit during the periods between switching of points and the change in the state of the electromechanical train stop drives are touched upon. The main technical characteristics of the power module, information about the used element base and the features of the constructive implementation of the equipment are given.
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