Safety power supply for train and train having same

Abstract

The invention discloses a safety power supply for a train and a train with the same. The safety power supply includes: receiving a first control signal through an amplifying drive unit, a first isolation unit and performing amplification processing to generate a first drive signal, and driving a first switch tube On or off, the first rectification and filtering unit rectifies and filters the current output by the secondary side of the first transformer to output the first direct current; the second isolation unit transmits the second control signal to the second transformer under the power supply of the first direct current , the second transformer couples the energy of the DC power supply from the primary side to the secondary side, and the capacitor charging and discharging unit generates a reduced driving signal; the second switching tube is turned on or off driven by the reduced driving signal, and the third transformer The energy of the DC power source received by the primary side is coupled to the secondary side, and the second rectification and filtering unit rectifies and filters the current output by the secondary side of the third transformer to output the second DC power, thereby controlling the energy output of the power supply and effectively reducing the impact current .

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a safe power supply for trains and a train with the same. Background technique [0002] Rail transit signal systems are mostly controlled by the on and off of relays, which are generally driven by 24V power supply. In related technologies, in order to meet the rail transit fail-safe principle, two pulses with fixed frequency and fixed duty cycle, such as low-frequency pulse and high-frequency pulse, are usually used to control the output of the DC-DC power module to realize logic and function and ensure the safety of signal output. [0003] However, the problem with the related technology is that when there is a low-frequency pulse, the power module starts to output voltage when the high-frequency pulse is input. During the rising process of the output voltage, due to the existence of the output capacitor, the output will have a relatively large instantaneous short-circuit curre...

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Problems solved by technology

[0003] However, the problem with the related technology is that when there is a low-frequency pulse, the power module starts to output voltage when the high-frequency pulse is input. During the rising process of the output voltage, due to the existence of the output capacitor, the output will have a relatively large instantaneous short-circuit current. , there will be a relatively large inrush current when returning to the input end, and the rail transit signal system will control multiple relays by connecting multiple DC-DC power modules in parallel. The total inrush current will be very large, and the DC-DC power module will generate a large enough load on the power supply at the moment of startup, and the voltage of the power supply may drop instantaneously, resulting in abnormal power supply

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