Inverter power driving circuit for railway phase-sensitive track circuit

Abstract

The invention discloses an inverter power driving circuit for a railway phase-sensitive track circuit. The inverter power driving circuit includes a serial port display module, a CPU and communicationserial port module, a current amplification circuit and a protection circuit; the CPU and communication serial port module includes a single chip microcomputer, a serial port isolation communicationcircuit and a CPU power off reset circuit, the single chip microcomputer is internally provided with an SPWM wave generator used for generating two ways of SPWM waves, the serial port isolation communication circuit is used for completing communication isolation between the CPU and communication serial port module and the serial port display module, and the current amplification circuit is used for amplifying an SPWM wave current to drive an inverter motherboard to generate a track power source or a local power source. The inverter power driving circuit is high in reliability, and low in system volume weight, power source output is pure sine waves, noise and electromagnetic interference can be reduced, an output power source can stabilize the voltage, the amplitude and the phase differencecan be adjusted, a railway field failure can be truly simulated, situations such as undervoltage, overvoltage and non-ideal phase difference of the field voltage are simulated, and the needs of experimental training teaching in railway higher vocational colleges are met.

Description

technical field [0001] The invention relates to a railway teaching and training equipment, in particular to an inverter power supply drive circuit for railway phase-sensitive track circuits, which is suitable for technical training of personnel in higher vocational colleges and railway enterprises and rail transit enterprises. Background technique [0002] With the further development of my country's high-speed railway and urban rail transit, phase-sensitive track circuits are widely used in rail transit. Phase-sensitive track circuits mainly provide train occupancy inspection and rail integrity inspection functions for railway sites, and 25Hz is mainly used on national railways. The main purpose of using 25Hz for the track circuit is to avoid the 50Hz current interference of the locomotive traction. In urban rail transit, since most of the subway track circuits use DC for locomotive traction, there is no traction current interference, so 50Hz or 25Hz is used. [0003] Due to...

AI Technical Summary

Problems solved by technology

[0006] 1. The original phase-sensitive track circuit power supply adopts ferromagnetic frequency conversion technology, which requires bulky transformers and diodes to change the frequency from 50HZ to 25HZ, and then filter to form an approximate sine wave, which makes the system too large and bulky;

[0007] 2. The phase-sensitive track power supply is realized by pure hardware, that is, the comparison between the sinusoidal signal and the high-frequency signal is used to generate SPWM. The waveform of the power supply is similar to a modified sine wave, not a pure sine wave, which will not only increase the size of the hardware circuit, but also introduce noise and interference. generate electromagnetic interference;

[0008] 3. The voltage and phase difference between the track power supply and the local power supply output by the existing phase-sensitive track circuit system are fixed outputs, which cannot be adjusted, which cannot meet the fault simulation during teaching, and is not conducive to experimental training and teaching

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