Through the comprehensive analysis of many related factors that cause the signal failure of locomotives, it is concluded that the normal applications affecting locomotive signals mainly include the following aspects: locomotive power supply fluctuations are large, locomotive power inverter output noise is large; o locomotive power supply is easily grounded, power supply Strong pulse interference; affected by high temperature environment of the locomotive and lack of perfect protection function.
Technical Improvement Measures Based on the current development of the domestic switching power supply technology, a new integrated signal power supply unit for locomotives has been developed. It is an inverter regulated power supply that supplies power to the locomotive signal equipment. The working principle is: the input power is first isolated by a high-frequency pulse transformer, and then high-frequency rectification, smooth filtering, voltage regulation control, overvoltage, overcurrent And short circuit protection and other functional control, the ultimate output performance of excellent 50V DC voltage. The specific working process of the power supply device.
Integral locomotive signal power supply device block diagram from the locomotive input unstable 110V DC power supply, first through the multi-channel inductive components of the anti-jamming network, the inverter power supply. The inverter of the power supply device adopts a dual-channel push-pull inverter circuit, and the power device adopts a high-power VMOS transistor, which can provide greater power and higher conversion efficiency. The high-frequency pulses generated by the inverter are full-wave rectified, and after smooth filtering by a network composed of multiple groups of inductive components, the output meets the requirements of high-performance 50V DC voltage to provide power for the locomotive signal equipment.
The functions of voltage sampling, voltage regulation, output over-current, over-voltage protection and output short-circuit protection of the power supply are all accomplished by the JW01-1 thick-film module. The thick film assembly can meet the high performance requirements of locomotive signals for power supply. Through device adjustment, the output over-current and over-voltage values ​​can be fine-tuned to meet the different requirements of field applications.
In addition, in order to ensure normal operation of locomotive signal equipment, and in particular, the passenger vehicle's high reliability requirements for locomotive signals, a standby power supply system is set in the locomotive signal power supply device. When the main power supply fails unexpectedly, it will automatically switch to standby power supply. On the system, the standby power system becomes the 50V inverter power supply provided by the locomotive. This emergency function ensures uninterrupted power supply to the locomotive signals. After the main circuit power supply is normal, it will automatically switch back from the standby power supply system. The conversion time is less than 0.5s, which does not affect the continuous and reliable operation of the locomotive signal host.
Taking into account the locomotive signal power supply should have a more extensive versatility, in the development of the power supply will be increased to 80W, this can meet the requirements of different types of locomotive signal equipment, not only for digital locomotive signal host, but also to meet the existing The use of locomotive signalling equipment has improved versatility.
In order to improve the safety and reliability of the integrated locomotive signal power supply, the power supply is provided with overvoltage, overcurrent and short circuit protection functions. When the overcurrent occurs, the power supply device circuit can be protected; when the voltage is overvoltage, the signal host and the load device are protected; when the output is short-circuited, the power supply can be automatically turned off (the fuse is not blown), and the power supply device can automatically resume power supply after the short-circuit is eliminated.
The three protection function specifications are as follows. 1. Overcurrent protection. Input 110V, output overcurrent ≥2.8A, the input voltage is gradually reduced, the output current application effect integrated locomotive signal power supply, the actual application in the Jingshan line, Beijing-Guangzhou line, Beijing-Kowloon line and Beijing source line, and in The SJ-93, SJ-94 and microelectronic host use proof: The power has a good resistance to locomotive power fluctuations, power pulse interference and power grounding capabilities. It has fundamentally changed the situation in the past in the use of locomotive signal equipment, due to the locomotive signal lamp failure and other failures to request scheduling commands, and locomotive signal equipment due to locomotive power fluctuations interference, grounding and other effects.
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