CN103730948A - Server cabinet continuous power supply method - Google Patents

Abstract

The invention provides a server cabinet continuous power supply method. Two power modules are arranged inside a server, one power module supplies electricity through a voltage stabilizing mechanism, the voltage stabilizing mechanism comprises an AC/DC switch and a battery, the AC/DC switch is connected with the city power output end, the input end of the battery and the input end of the one power module, and a charger is further arranged between the input end of the battery and the city power output end; the other power module supplies electricity through a high-voltage direct-current power supply, and the high-voltage direct-current power supply supplies electricity through the city power and outputs direct-currents. Compared with the prior art, the server cabinet continuous power supply method solves the problem that an existing data center power supply system is low in efficiency, improves the energy utilization rate, is low in cost, saves energy, is efficient, and enhances market competitiveness of products.

Description

A method for continuous power supply of a server cabinet

technical field

The invention relates to the technical field of computer applications, in particular to a continuous power supply method for a server cabinet.

Background technique

With the development of information technology and the rapid development of Internet technology, the construction of data centers of enterprises and institutions in my country has entered a new stage of rapid development, forming a new wave of construction. While the concentration of data and computing power brings huge benefits, it also puts forward new requirements for green energy saving and continuous power supply of data centers.

The basic features of the new generation of data centers include the following main features: modularization, rapid scalability, energy saving and space saving, high IT resource utilization, high reliability redundant design, etc.

Given the above characteristics, the power density requirements of the new generation data center are very high in terms of power supply. It is the general trend to place more IT equipment in a limited space. Centralized UPS1+1 or N+1 redundancy is adopted, the UPS host itself is very large, and the battery cabinet also takes up more space because of its size and number, because the overall efficiency of redundancy is also low. The high power density of the modular data center is contrary to the original intention.

As shown in Figure 1 and Figure 2, for the traditional UPS, due to the AC/DC change and DC/AC inverter, the conversion efficiency is high under ideal conditions, but the efficiency is lower than 50% or even higher in actual use. Low, resulting in a great waste of energy; moreover, for small data centers, or only a single cabinet application, the traditional UPS is more expensive and other factors. On the power supply, the power module often works in a low-load operation state, which has low work efficiency and wastes energy, and the simultaneous operation of each module greatly increases the damage probability of the power supply.

In response to the above problems, we propose a design method for a new green server cabinet connected power supply system. The advantages of the continuous power supply design method for server cabinets are 100% AC power conversion efficiency, high DC power conversion efficiency, high power supply efficiency, green energy saving

With the continuous promotion of domestic high-voltage DC power supply technology and the large demand for energy-saving equipment, we predict that the design method of the new green server cabinet continuous power supply system we invented will have broad application prospects in companies with data centers.

Contents of the invention

The technical task of the present invention is to solve the deficiencies of the prior art and provide a continuous power supply method for server cabinets.

The technical solution of the present invention is realized in the following manner. The power supply process of the server cabinet continuous power supply method is as follows: at least two power supply modules are arranged in the server, one of the power supply modules supplies power through a voltage stabilizing mechanism, and the voltage stabilizing mechanism The mechanism includes an AC/DC switching switch and a battery, wherein the AC/DC switching switch is respectively connected to the mains output terminal, the battery input terminal, and the input terminal of the above-mentioned power module, and a charging device is also set between the battery input terminal and the mains output terminal. The other power supply module is powered by a high-voltage DC power supply, which is powered by the mains and outputs DC power;

When the server is running, use the active and standby functions of the power supply to convert two power supply modules to operate at a low load at the same time into a medium or high load operation of one power supply;

Both power supply modules input commands through the PMbus to reduce the CPU frequency, thereby reducing the power of the server.

The two power supply modules operate alternately, that is, one of the power supply modules switches to the other power supply module after running for a period of time, and the running power supply module switches back after running for a period of time, and the sequence is cycled.

The beneficial effect that the present invention produces compared with prior art is:

A continuous power supply method for server cabinets of the present invention is different from the traditional UPS power supply technology of large data centers, adding an AC/DC switch. When the mains power fails, the server power supply can maintain stable output for 46ms, so we It is necessary to complete the AC/DC switching within this time, and the switching time used here is only 6-10ms, which can fully meet the requirements; no inverter is used, just add a charger in front of the battery, under normal circumstances The utility power directly supplies power to the load while charging the battery. The battery works in a floating charge state. When the utility power fails, the current power supply supports both AC input and DC input, so the battery can directly supply power to the server. The battery power supply here can be 220V high-voltage DC, or 48V communication power supply; adding a high-voltage DC power supply module can provide high-reliability power supply, greatly save energy consumption, improve input parameters, greatly increase the load capacity, and make cutover and transformation more convenient ;Use the function of power supply active + standby to convert two power supplies at the same time with low load operation into one power supply with medium or high load operation to improve the efficiency of the power supply; input commands through the PMbus to reduce the CPU frequency, thereby reducing the power of the server and making the power supply work at In the high-efficiency mode, it needs to be executed according to the specific needs and time; one power module can be switched to another module after running for a period of time, so that the two modules operate alternately, which can greatly reduce the probability of power supply damage and improve the reliability of the power supply. It is practical and practical, achieves the purpose of energy saving in the data center system, and is easy to popularize.

Description of drawings

Accompanying drawing 1 is a traditional UPS design drawing.

Accompanying drawing 2 is a traditional UPS power supply efficiency curve.

Accompanying drawing 3 is the realization block diagram of the present invention.

Detailed ways

A method for continuously supplying power to a server cabinet according to the present invention will be described in detail below in conjunction with the accompanying drawings.

In order to solve the above problems, as shown in Figure 3, the present invention provides a continuous power supply method for server cabinets, the power supply process is:

At least two power supply modules are set in the server, one of which is powered by a voltage stabilizing mechanism, and the voltage stabilizing mechanism includes an AC/DC switching switch and a battery, wherein the AC/DC switching switch is connected to the mains output terminal and the battery input terminal respectively . The input terminals of the above-mentioned power modules are connected, and a charger is also provided between the battery input terminal and the mains output terminal. The switching time of the switch is 6-10ms, and the battery power supply is 220V high-voltage DC or communication power supply 48V DC; The other power supply module is powered by a high-voltage direct current power supply, and the high-voltage direct current power supply is powered by the mains and outputs direct current.

When the server is running, use the active and standby functions of the power supply to convert two power supply modules to operate at a low load at the same time into a medium or high load operation of one power supply;

Both power supply modules input commands through the PMbus to reduce the CPU frequency, thereby reducing the power of the server.

The two power supply modules operate alternately, that is, one of the power supply modules switches to the other power supply module after running for a period of time, and the running power supply module switches back after running for a period of time, and the sequence is cycled.

The reliability of the power supply system in the power supply method provided by the present invention is greatly improved: the main purpose of introducing the high voltage direct current power supply technology is to improve the safety of the system. The UPS system itself only has redundant backups for parallel hosts, and the system components are more in series. Its availability is the multiplication result of the reliability of each part of the components, and the overall reliability is lower than that of a single component. In contrast to the DC system, the system's parallel rectifier modules and battery packs constitute a redundant relationship, and the unreliability is the result of the multiplication of each component, and the overall reliability is higher than that of a single component. Both theoretical calculation and operation practice show that the reliability of the DC system is much higher than that of the UPS system. An example is that there are basically no accidents of large-scale DC systems being paralyzed.

Greatly save energy consumption: the UPS mainframes currently used in large quantities are online double-conversion types. When the load rate is greater than 50%, its conversion efficiency is similar to that of switching power supplies. However, a reality that cannot be ignored is that in order to ensure the reliability of the UPS system, the UPS mainframes all operate in the n+1 (n=1, 2, 3) mode, coupled with the influence of the harmonics and crest factors input by the back-end load, the UPS mainframe It cannot meet the requirements of operation. Usually, the maximum stable operation load rate of UPS stand-alone design is only 35-53%. However, due to the influence of power consumption of back-end equipment and business development, many UPS systems usually reach the design load rate in the middle and late stages of life, or even fail to reach the design load rate at all. The UPS main unit runs at a very low load rate for a long time. The conversion efficiency is usually more than 80%, or even lower.

For the DC power system, because of its modular structure, the monitoring module, monitoring system or on-site personnel can flexibly control the number of modules starting and running according to the size of the output load, so that the load rate of the rectifier module is always kept at a high level. level, so that the conversion efficiency of the system can be kept at a high level.

The input parameters have been greatly improved: field tests have found that the commonly used 12-pulse online double-conversion UPS host, after adding 11 filters, its input power factor is usually 0.8-0.9, the maximum is only 0.95, and the input current harmonic content is usually Around 7.5%.

Correspondingly, due to the application of the PFC circuit, under rated working conditions, the input power factor of the switching rectifier module is usually above 0.99, and the harmonic content of the input current is usually below 5%.

The direct effect of the improvement of the input parameters is that the capacity of the front-end equipment can be greatly reduced, and the front-end low-voltage power distribution cabinet can no longer be equipped with a reactor, which can also reduce the withstand voltage requirement of the compensation capacitor.

The load capacity is greatly improved: The load capacity of the UPS system is restricted by two factors. One is the power factor of the load. Taking a certain type of host of a large domestic UPS manufacturer as an example, when the output power factor is 0.5 (capacitive), The maximum allowable load rate is only 50%; the second is the load current crest factor, usually the design crest factor of the UPS host is 3, if the load current crest factor is greater than 3, the UPS host will be used with reduced capacity.

For the DC system, there is no problem of power factor; because it is connected in parallel with a large-capacity battery pack with extremely low internal resistance, and the rectifier module has a large amount of surplus (charging and standby), its load capacity of high current peak factor is very high. Strong, without special consideration of safety margin capacity.

Cutover transformation is more convenient: For equipment powered by UPS, unless it adopts dual power supplies (or four power supplies, six power supplies), or is specially equipped with STS equipment, it can only be cut over in power failure mode. For important systems, this is unbearable. What's more troublesome is that some old equipment that is not supported by the manufacturer may not be able to restart after shutdown.

DC power supplies can be connected together as long as the output voltage and polarity are the same, so as to realize cutover without power failure, which is very easy to do.

The invention solves the defect of low efficiency of the existing data center power supply system, has low cost, energy saving and high efficiency, and increases the market competitiveness of products.

The above description is only an embodiment of the present invention, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (2)

1. A continuous power supply method for a server cabinet, characterized in that the power supply process is as follows: at least two power supply modules are arranged in the server, and one of the power supply modules supplies power through a voltage stabilizing mechanism, and the voltage stabilizing mechanism includes an AC/DC switching switch, The battery, in which the AC/DC switching switch is connected to the mains output terminal, the battery input terminal, and the input terminal of the above-mentioned power module respectively, and a charger is also arranged between the battery input terminal and the mains output terminal; the other power module passes through the high voltage DC power supply, the high-voltage DC power supply is powered by the mains and outputs DC power; When the server is running, use the active and standby functions of the power supply to convert two power supply modules to operate at a low load at the same time into a medium or high load operation of one power supply; Both power supply modules input commands through the PMbus to reduce the CPU frequency, thereby reducing the power of the server. 2. A method for continuously supplying power to a server cabinet according to claim 1, wherein the two power supply modules operate alternately, that is, one of the power supply modules switches to the other power supply module after running for a period of time, The running power module switches back after running for a period of time, and the sequence is cycled.

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