Vehicle passenger compartment illumination redundancy backup power supply circuit and control method thereof

Abstract

The invention discloses a vehicle passenger compartment illumination redundancy backup power supply circuit comprising two driving power supplies with the same internal structure and including a firstdriving power supply and a second driving power supply. The input ends of the two driving power supplies are all connected with a power supply circuit. The output ends of the two driving power supplies are connected to respective loads. The load capacities of the driving power supplies are higher than the actual loads. Each driving power supply includes a power circuit unit, a control circuit unit and a backup circuit unit. The power circuit unit and the control circuit unit are led out of the input end of the driving power supply. The power circuit unit is connected with the positive pole ofthe load and the backup circuit unit. The control circuit unit is connected with the negative pole of the load. The backup circuit units of the two driving power supplies are connected to each other.In addition, the invention discloses a control method of the vehicle passenger compartment illumination redundancy backup power supply circuit. The vehicle passenger compartment illumination redundancy backup power supply circuit combines the advantages of an existing redundant power supply method and can greatly improve the stability of the vehicle passenger compartment illumination power supplysystem.

Description

technical field [0001] The invention relates to the field of power supply equipment, in particular to a redundant backup power supply circuit and a control method for lighting in a passenger compartment of a vehicle. Background technique [0002] With the rapid development of the urban rail transit industry, the reliability requirements for the lighting power supply system of the passenger compartment are getting higher and higher. The subway vehicles generally run in tunnels and need to be illuminated by the lighting system in the passenger compartment. If the power supply fails and the passenger compartment has no lighting, it will Causing panic among passengers and affecting train safety. At present, power supply redundancy is usually used to improve power supply reliability and deal with sudden failures. Existing power redundancy schemes include: capacity redundancy, redundant cold backup, parallel current sharing N+1 backup and redundant hot backup. Capacity redundanc...

AI Technical Summary

Problems solved by technology

Capacity redundancy means that the maximum load capacity of the power supply is greater than the actual load. The reserved capacity space can ensure the normal operation of the load and can guarantee normal operation when the load changes within a certain range, but the capacity redundancy can cope with the limited load variation. It is of little significance to improve reliability; redundant cold backup means that the power supply is composed of multiple modules with the same function, and one of them supplies power normally. When it fails, the backup power supply starts to work immediately, and there is a time interval when the power supply is switched , it is easy to cause a voltage gap, which will cause the system to stop; the N+1 backup mode of parallel current sharing means that the power supply is composed of multiple identical units, and each unit is connected in parallel through OR gate diodes, and each unit supplies power to the equipment at the same time. The scheme will not affect the load power supply when one power supply fails, but it is easy to affect all units when the load end is short-circuited, and there is a risk of overall failure; redundant hot backup means that the power supply is composed of multiple units, and they work at the same time, and backup when the main power supply fails The power supply can be put into operation immediately, and the output voltage fluctuation is very small, but only one of the power supplies supplies power to all devices at full load, and the other power supplies are at no load, so that the life of the power supply working at full load is the first to decay until the backup power supply starts when a failure occurs, and the power input cost is high.

The above redundant backup methods all have deficiencies and cannot meet the reliability requirements of the vehicle passenger compartment lighting power supply system

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