Method for power supply of direct current bus voltage-adjustable railway signal power module

Abstract

The invention discloses a method for the power supply of a direct current bus voltage-adjustable railway signal power module. Two stages of power conversion units are involved, and are a first-stage AC / DC unit and a second-stage DC / DC unit respectively. A voltage converted by the second-stage DC / DC unit is output to a load; an alternating current voltage Vin is converted into a relatively higher and adjustable direct current voltage Vbus(X); energy is stored in a direct current bus consisting of electrolytic capacitors; and a direct current bus voltage Vbus is a function of output power, output current and other parameters X reflecting the load characteristics of a switching power module. On the premise of reaching technical indexes of continuous power supply capacity, requirements on thecapacity of the electrolytic capacitors is reduced, a bus voltage value can be properly increased and needs in the electrolytic capacitors can be remarkably reduced. Under the condition of unrated full load, the bus voltage value is decreased, the working stress of an internal device of the switching power module is reduced, loss is reduced and the efficiency and product reliability are improved.

Description

technical field [0001] The patent of the present invention relates to a power supply device used in the railway field to provide energy supply for railway signal equipment, specifically a power supply method. Background technique [0002] According to the iron standard, the time from the input power supply of the DC output switching power supply module to the DC output voltage falling to the lower limit of voltage regulation accuracy (0.97 times the rated output voltage) shall not be less than 0.1 second. That is to say, the power module is required to have a certain continuous power supply capability. When the two mains inputs of the power system where the power module is located are switched, the output voltage of the module will not drop by more than 3% of the rated output voltage. [0003] Such specifications require that the power module has sufficient energy reserves during input power failure, but this will lead to a significant increase in the cost of the power modul...

AI Technical Summary

Problems solved by technology

[0011] (1) Since the UPS itself is also a complex electronic product, when it is connected in series to the power supply circuit, from the point of view of the reliability prediction model, it is a series structure, which will lead to the reliability index MTBF of the entire power supply circuit Decreased significantly;

[0012] (2) Since the price of the UPS (including the price of the battery pack) is higher than that of the power module itself, the cost of the entire solution has risen significantly, and the workload of on-site installation, commissioning and post-maintenance has also increased significantly

[0020] (1) Since the battery is a device with a short service life, especially when the management and maintenance of the battery are not in place, problems such as battery polarization, capacity drop or even damage are serious, and need to be replaced regularly, resulting in the failure of the entire power supply scheme Reliability index MTBF decreased significantly;

[0021] (2) Since the price of the battery is higher than that of the power module itself, the cost of the entire solution will increase significantly, and the workload of on-site installation, commissioning and later maintenance will also increase significantly

[0031] (2) Due to the high price of electrolytic capacitors, especially high-rated voltage and large-capacity electrolytic capacitors, the cost of the entire solution has risen significantly, and the workload of on-site installation, commissioning and post-maintenance has also increased significantly

Images