The Railway Signal Power Supply Based On Digital Control Platform

Based on the development and application of railway signal power supply, this paper introduces the working principle of railway signal power and the development trend in detail, and builts MATLAB/Simulink simulation model according to the power electronic circuit. Through the simulation model, validate the feasibility of the design parameters. Railway signal power supply requirements two ways isolated inverter output, so the DC/DC part choses the phase shift full bridge topology, later stage adopts full bridge inverter topology structure. Phase shift full bridge topology structure can guarantee the transformer primary side realize ZVS switch, but the vice side rectifier bridge part has a voltage peak, in order to solve this problem the paper introduces the active clamp circuit structure.Inverter part adopts full bridge topology and control strategy is single polarity double frequency mode. In view of the traditional double closed loop structure was improved, this paper introducts the output voltage feedback, fully realized the current inner ring decoupling, compensation correction link greatly simplified. In the full review the advantages and disadvantages of parallel way on various application occasions, inverter parallel system adopts the improved master-slave parallel way:automatic host type master-slave parallel way, the communication mode is CAN structure, greatly ensured the reliability of communication. After the parameter design, the paper establishes a digital-analog hybrid MATLAB simulation model, more in accordance with practical circuit structure parameters. The inverter single and parallel system fully adopts digital control, digital control chip by TI TMS320F2812. The simulation results and the actual circuit experiment results fully anastomosis.It has carried on the summary to this article, and introduced the further work.