Parallel connection communication power supply system and control method thereof

Abstract

The invention relates to a parallel communication power supply system and a control method thereof. A positive busbar and a negative busbar of a main power supply are connected with a positive busbar and a negative busbar of a slave power supply respectively; the rated output voltage of the slave power supply is higher than that of the main power supply; and the slave power supply is also provided with a current limiting point, and an output current of the slave power supply does not exceed the current corresponding to the current limiting point. When the external load is the light load or the normal load, the current limiting point is a normal current limiting point and the normal current limiting point remains the same; when the external load is the heavy load, the current limiting point changes with the load. The two sets of the power supplies which are connected in parallel can realize the capacitance expansion without communication, the voltage deviation exists between the main power supply and the slave power supply, and the current limiting point is arranged on the slave power supply to realize the current automatic distribution among power supply modules which are connected in parallel, so that the load is appropriately distributed among the power supply modules; moreover, the regulation and the setting of parameters are simple, and the cut-over process is so simple that the positive and the negative busbars of the two sets of the power supplies are only required to be connected respectively. The system can be used for capacitance expansion of the prior one set of the power supply and can also realize the 1 plus 1 hot backup of partial capacitance.

Description

technical field [0001] The invention relates to a communication power supply, in particular to a parallel communication power supply system and a control method thereof. Background technique [0002] In the application of communication power supply, sometimes it is necessary to expand the capacity of the power supply, or 1+1 hot backup of the power supply system is required. Both of these situations can be attributed to the situation that two sets of power supplies share the same set of loads. If it is necessary to expand the capacity of an existing set of power supplies or 1+1 hot backup, if the two sets of power systems cannot communicate with each other, since the load distribution between the two sets of power supplies is uncontrollable, different types of power supplies The condition of the operating point is poor when parallel machines are used. For a power supply system, the existing expansion technology can only be realized by adding rectifier modules or rectifier c...

AI Technical Summary

Problems solved by technology

If it is necessary to expand the capacity of an existing set of power supplies or 1+1 hot backup, if the two sets of power systems cannot communicate with each other, since the load distribution between the two sets of power supplies is uncontrollable, different types of power supplies The condition of the operating point is poor when the machine is in parallel

For a power supply system, the existing expansion technology can only be realized by adding rectifier modules or rectifier cabinets. The disadvantage is that users must choose rectifier modules from original manufacturers when expanding capacity. Expensive, it will put users in a dilemma, if the rectifier module has been discontinued or the manufacturer can no longer provide corresponding services, or even cannot expand

For the 1+1 hot backup requirement of the power system, there is no way to increase the rectification module or rectification cabinet in the existing power system.

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