Medium and low voltage power center

Abstract

The invention relates to a medium and low voltage power center. The power system may include a power center. The power center may include a busway flange configured to receive an input AC voltage from the first busway. The power center may include an AC converter configured to receive an input AC voltage from the busway flange and to convert the input AC voltage to at least one of a secondary AC voltage or an output DC voltage. The power center may include a battery configured to store the output DC voltage and release the output DC voltage to the second busway. The AC converter may include a solid state transformer.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to U.S. Provisional Patent Application No. 63 / 639,087, filed April 26, 2024, which is incorporated herein by reference in its entirety. Technical Field

[0003] This disclosure relates to power systems for electronic equipment, and more specifically to power systems for servers and server racks. Background Technology

[0004] Data centers are high-power environments that require significant power input to operate a large number of servers within a small space, such as a server rack. Traditionally, delivering power to a server rack involves several conversion steps from utility power to the chip. For example, data centers typically convert incoming alternating current (AC) power to direct current (DC) power for storage, such as in uninterruptible power supplies (UPS) or batteries. When power from the UPS or batteries is needed, the power is converted from DC to AC and distributed throughout the server rack via a power distribution unit (PDU). Once distributed to an individual server, the AC power is again converted to DC for use. This method of power distribution from utility AC to server DC results in considerable power loss due to energy losses at each conversion step and increases the heat generated during conversion. This method also requires extensive cabling, which increases design complexity and footprint.

[0005] Therefore, having a power conversion and distribution system that does not require the aforementioned costs and labor inputs may be advantageous. Summary of the Invention

[0006] Therefore, this disclosure relates to systems and methods for converting an input alternating current (AC) voltage into an output direct current (DC) voltage and distributing the output DC voltage.

[0007] In one or more embodiments, the technology described herein relates to power systems. In one embodiment, the power system includes a power center configured to convert an input alternating current (AC) voltage into an output direct current (DC) voltage. In another embodiment, the power center includes a busway flange configured to receive an input AC voltage from a first busway. In yet another embodiment, the power center includes an AC converter configured to receive an input AC voltage from the busway flange and convert the input AC voltage into an output DC voltage. In yet another embodiment, the power center includes a battery configured to store DC power and release an output DC voltage to a second busway.

[0008] In some embodiments, the technology described herein relates to another power system. In one or more embodiments, the power system includes a power center configured to convert an input alternating current (AC) voltage into an output direct current (DC) voltage. In one or more embodiments, the power center includes a tap-off box configured to receive an input AC voltage from a first busbar. In another embodiment, the power center includes an AC converter configured to receive an input AC voltage from the tap-off box and convert the AC voltage into an output DC voltage. In yet another embodiment, the power center includes a battery configured to store DC voltage and release the output DC voltage to a plurality of servers.

[0009] In embodiments, the technology described herein relates to a method for powering a server rack. In one embodiment, the method includes: receiving utility power, wherein receiving utility power includes receiving an input alternating current (AC) voltage; and converting the input AC voltage into an output DC voltage. In another embodiment, the method includes storing the output DC voltage as stored energy. In another embodiment, the method includes releasing the stored energy as an output DC voltage to the server rack. In yet another embodiment, the method includes the server rack consuming the output DC voltage, wherein the output DC voltage is not converted back to AC voltage between the release of the stored energy and the consumption of the output DC voltage.

[0010] It should be understood that the foregoing general description and the following detailed description are merely exemplary and illustrative, and do not necessarily limit the scope of this disclosure. The accompanying drawings, incorporated in and constituting a part of the specification, illustrate the subject matter of this disclosure. Specification and Appendices Figure 1 It serves to explain the principles underlying this disclosure. Attached Figure Description

[0011] Those skilled in the art can better understand the many advantages of this disclosure by referring to the accompanying drawings.

[0012] Figure 1 A block diagram depicting a power system scheme for powering a server rack according to one or more embodiments of the present disclosure is shown.

[0013] Figure 2A A block diagram depicting one or more embodiments of an electric power system according to this disclosure is shown.

[0014] Figure 2B A block diagram depicting a power system including a second busbar trunking according to one or more embodiments of the present disclosure is shown.

[0015] Figure 3A block diagram depicting another power system according to one or more embodiments of the present disclosure is shown.

[0016] Figure 4 A block diagram depicting one or more embodiments of an electric power system according to this disclosure is shown.

[0017] Figure 5 A process flowchart depicting a method for powering a server rack according to one or more embodiments of the present disclosure is shown. Detailed Implementation

[0018] Before explaining one or more embodiments of this disclosure in detail, it should be understood that the embodiments, in their application, are not limited to the details of the construction and arrangement of the components, steps, or methods set forth in the following description or shown in the accompanying drawings. In the following detailed description of the embodiments, numerous specific details may be set forth to provide a more thorough understanding of this disclosure. However, it will be apparent to those skilled in the art who benefit from this disclosure that the embodiments disclosed herein can be practiced without some of these specific details. In other instances, well-known features may not be described in detail to avoid unnecessarily complicating this disclosure.

[0019] As used herein, the letters following the reference numerals are intended to designate embodiments of features or elements that may be similar to, but not necessarily identical to, previously described elements or features having the same reference numerals (e.g., 1, 1a, 1b). Such abbreviated symbols are used for convenience only and should not be construed as limiting the scope of this disclosure in any way unless expressly stated otherwise.

[0020] Furthermore, unless explicitly stated otherwise, "or" refers to an inclusive "or," not an exclusive "or." For example, condition A or B is satisfied by any of the following: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); and both A and B are true (or exist).

[0021] Additionally, the terms "a" or "an" may be used to describe elements and components of the embodiments disclosed herein. This is done merely for convenience, and "a" and "an" are intended to include "one" or "at least one," and the singular includes the plural unless it is obvious that they have a different meaning.

[0022] Finally, as used herein, any reference to “one embodiment” or “implementation” means that a particular element, feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment disclosed herein. The phrase “in an embodiment” appearing in different places in the specification does not necessarily refer to the same embodiment, and an embodiment may include one or more features explicitly described or inherent in this document, or any combination or sub-combination of two or more such features, and any other features that may not necessarily be explicitly described or inherent in this disclosure.

[0023] A power system is disclosed that provides power conversion for multiple electronic devices, such as multiple servers or server racks. The power system includes a power center or substation that converts input alternating current (AC) voltage, such as a common input AC voltage, into output direct current (DC) voltage. The output DC voltage is then distributed to the multiple servers without any intermediate DC-to-AC conversion steps (e.g., no AC power from a UPS or PDU). This power system reduces the number of AC-to-DC conversion steps, which reduces energy loss, heat generation, and design complexity.

[0024] Figure 1 A block diagram depicting a power system scheme 100 for powering a server rack 102 (e.g., multiple servers) according to one or more embodiments of this disclosure is shown. The power system scheme 100 includes: receiving utility power 104 (e.g., input AC voltage from a power utility); converting the input AC voltage into an output DC voltage; and storing the output DC power in a battery 106. The DC power is then transmitted to the server rack 102 to power the multiple servers. The power system scheme 100 does not include converting the DC voltage from the battery into AC voltage when power is distributed to the server rack 102. For example, the power system scheme 100 does not include distributing AC voltage via a PDU to power the server rack 102.

[0025] Figure 2A A block diagram depicting a power system 200 according to one or more embodiments of the present disclosure is shown. The power system 200 converts an input AC voltage into an output DC voltage consumed by one or more server racks 102a to 102e. The power system 200 may also supply power to one or more cooling distribution units (CDUs) 202a to 202b that cool one or more server racks 102a to 102e.

[0026] In one implementation, the power system 200 includes a power center 204 that converts an input AC voltage into an output DC voltage. The power center 204 includes: a battery 106 that stores DC power and releases an output DC voltage; and an AC-to-DC conversion device (e.g., an AC converter 210), such as a solid-state transformer, which (e.g., via a first busbar flange 208) receives the input AC voltage from a first busbar 206 and converts the input AC voltage into a secondary AC voltage or an output DC voltage.

[0027] Solid-state transformers can operate in different conversion stages or modes, including DC-DC, AC-DC, DC-AC, or AC-DC-DC-AC stages. For example, a solid-state transformer can convert an input AC voltage to a secondary AC voltage, and then subsequently convert the secondary AC voltage to an output DC voltage. In another example, a solid-state transformer can convert an input AC voltage to a secondary AC voltage, and a separate rectifier or other conversion device can convert the secondary AC voltage to an output DC voltage. In some implementations, the initial AC voltage is converted to an intermediate DC voltage before being further converted to an output DC voltage. Other conversion devices (e.g., rectifiers and transformers) can be used to convert the input AC voltage to a DC output voltage. Once the input AC voltage has been converted to an output DC voltage, the output DC voltage can be directly supplied to the server rack for consumption, or supplied to battery 106 and stored until the server rack requires power.

[0028] In this implementation, battery 106 is integrated within an uninterruptible power supply (UPS). The UPS can include any type of battery system. For example, the UPS can be configured as an online / double-conversion UPS, a single-conversion UPS, a multi-mode UPS, a DC UPS, an online interactive UPS, an offline / backup UPS, a hybrid topology / on-demand double-conversion UPS, and a ferroresonant UPS. For instance, power center 204 may include a UPS where battery 106 receives power from AC converter 210 as an output DC voltage. Battery 106 then releases the power as an output DC voltage to power server racks 102a to 102e. In this way, the UPS and battery 106 completely isolate the DC power load from the original utility power, and the output is already suitable for critical equipment such as server racks 102a to 102e.

[0029] Reference Figure 2AThe diagram illustrates a conversion scheme 212 for converting between AC and DC voltages. For example, conversion scheme 212 may include an AC-DC conversion step 214 occurring in power center 204 and a DC-DC conversion step 216 occurring in power center 204 or at another point within power system 200 (e.g., at one or more server racks 102a to 102e).

[0030] In this implementation, a portion of the output DC voltage is converted back to AC voltage to power non-server devices, as shown in DC-AC conversion step 218. For example, the AC voltage can be used to power CDUs 202a to 202b.

[0031] In this implementation, power system 200 includes a backup power center 220. Backup power center 220 may be similar to power center 204. For example, backup power center 220 may include an AC converter 220, such as a solid-state transformer as described herein. Backup power center 220 is coupled to backup first busbar 226 via backup first busbar flange 228. If power center 204 or a component associated with power center 204 fails, backup power center 220 supplies power to server racks 102a-102d and / or CDUs 202a-202b.

[0032] Figure 2B A block diagram depicting a power system 200 according to one or more embodiments of the present disclosure, including a second busbar 230, is shown. The second busbar 230 enables the distribution of output DC voltage to one or more servers 102a to 102e and / or CDUs 202a to 202b. For example, the power system 200 may include CDUs 102a to 102e that operate under DC power and are therefore operable via output DC voltage. In another example, the power system 200 may include an inverter at each CDU 202a to 202b that converts the DC output voltage into a consumption voltage for use by the CDUs 202a to 202b. The second busbar may receive the output DC voltage from a power center 204 via a distribution link, such as a junction box.

[0033] In one implementation, the power system 200 includes a backup second busbar 234 that receives power from a backup power center 220 (e.g., via a backup distribution link 236, such as a junction box). If the second busbar 230 fails to deliver power, the backup second busbar supplies power to server racks 102a-102e and / or CDUs 202a-202b. In another implementation, the second busbar 230 and / or the backup second busbar 234 have the capacity to deliver more than 500A, more than 1000A, or more than 1500A.

[0034] In one implementation, the power center 204 is configured to receive an input AC voltage. For example, the input AC voltage may be equal to and / or greater than 600V. In another example, the input AC voltage may be greater than 1000V (1kV). In another implementation, the power center 204 may have an upper limit for the voltage. For example, the input AC voltage may have an upper limit of 1kV, 2.4kV, 5kV, 10kV, 20kV, 36kV, or 69kV. For example, the power center 204 may operate at voltages in the range of 600V to 69kV. In another example, the power center 204 may operate at voltages in the range of 2.4kV to 69kV.

[0035] In an embodiment, power center 204 may include one or more of the following: battery 106, AC converter 210, first busbar flange 208, first busbar 206, distribution link 232, or second busbar 230. In an embodiment, power system 200 may include one or more of the following: power center 204, backup power center 220, first busbar 206, backup first busbar 226, first busbar flange 208, backup first busbar flange, second busbar 230, backup second busbar 234, distribution link 232, backup distribution link 236, one or more server racks 102a to 102d (e.g., having multiple servers), and / or CDUs 202a to 202b.

[0036] Reference Figure 3 In one or more embodiments of this disclosure, another power system 300 is disclosed. Power system 300 may include one or more components as described with respect to power system 200, and vice versa. Power system 300 converts and distributes a low input AC voltage from a low-voltage AC source 301 to one or more server racks 102c to 102d and / or CDUs 202a to 202b. The low input AC voltage may include an input AC voltage equal to or less than 600V. For example, the low input AC voltage may be approximately 575V.

[0037] In one implementation, the power system 300 includes a power center 304. The power center 304 may include one or more components of itself, or vice versa. For example, the power center 304 may include an AC converter 306 for converting an incoming input AC voltage into an output DC voltage. For example, the power center 304 may include a solid-state transformer that receives the input AC voltage from a first busbar 308 (e.g., a low-voltage (LV) first busbar) via a tap changer (TOP) 310 and converts the input AC voltage into a secondary AC voltage or an output DC voltage. For example, the solid-state transformer may convert the input AC voltage into a secondary AC voltage and then subsequently convert the secondary AC voltage into an output DC voltage. In another example, the solid-state transformer may convert the input AC voltage into a secondary AC voltage, and a separate rectifier or other conversion device may convert the secondary AC voltage into an output DC voltage. In some implementations, the initial AC voltage is converted into an intermediate DC voltage before being further converted into an output DC voltage. Other conversion devices (e.g., rectifiers and transformers) may be used to convert the input AC voltage into a DC output voltage. Once the input AC voltage is converted into the output DC voltage, the output DC voltage can be directly transmitted to the server rack for consumption, or transmitted to battery 312 and stored until the server rack needs power.

[0038] The power system 300 can supply power to CDUs 202a to 202b directly via a first busbar (e.g., via input AC voltage) or via a power center 304. For example, the power center 304 can provide an output DC voltage to CDUs 202a to 202b, which can be used directly by CDUs 202a to 202b (e.g., for DC-compatible CDUs 202a to 202b) or converted to AC voltage via an inverter. In another example, the power center 304 can provide a decreasing AC voltage to CDUs 202a to 202b.

[0039] In one embodiment, the power system 300 includes: a backup power center 314 that receives power from a backup first busbar 315 via a backup junction box 316; and a backup first busbar electrically coupled to a backup low AC voltage source. If the first busbar fails to deliver power, the backup power center 314 supplies power to server racks 102c to 102d and / or CDUs 202a to 202b. In another embodiment, the first busbar 308 and / or the backup first busbar 315 have the capacity to deliver more than 500A, more than 1000A, or more than 1500A.

[0040] In an embodiment, power center 304 may include one or more of the following: battery 312, AC converter 306, first busbar 308, or first junction box. In an embodiment, power system 300 may include one or more of the following: power center 304, backup power center 314, first busbar 308, backup first busbar 315, first junction box 310, backup first junction box 316, one or more server racks 102c to 102d (e.g., having multiple servers), and / or CDUs 202a to 202b.

[0041] Figure 4 Block diagrams depicting power systems 200 and 300 according to one or more embodiments of the present disclosure are shown. Power systems 200 and 300 may include one or more power centers 204 and 304 and / or one or more backup power centers 220 and 314.

[0042] In some embodiments, one or more power centers 204, 304 and / or one or more backup power centers 220, 314 include a controller 400. In some embodiments, the controller 400 includes one or more processors 402. For example, one or more processors 402 may be configured to execute a set of program instructions maintained in memory 404 or a memory device. As an illustration, the controller 400 may be configured to execute commands for controlling the conversion of input AC voltage to output DC voltage by one or more power centers 204, 304 and / or one or more backup power centers 220, 314. The controller 400 is intended to be operatively coupled to one or more sensors, such as one or more current sensors, which may be used to determine overcurrent events, thereby allowing the controller 400 to be configured to take one or more avoidance actions, such as opening a relay.

[0043] One or more processors 402 of controller 400 may include any processor or processing element known in the art. For the purposes of this disclosure, the terms "processor" or "processing element" may be broadly defined to encompass any device having one or more processing elements or logic elements (e.g., one or more microprocessor devices, one or more application-specific integrated circuit (ASIC) devices, one or more field-programmable gate arrays (FPGAs), or one or more digital signal processors (DSPs)). In this sense, one or more processors 402 may include any device configured to execute algorithms and / or instructions (e.g., program instructions stored in memory). In some embodiments, one or more processors 402 may embody a desktop computer, a mainframe computer system, a workstation, a graphics computer, a parallel processor, a network computer, or any other computer system configured to execute program instructions. Furthermore, the steps described throughout this disclosure may be performed by a single controller or alternatively by multiple controllers. Additionally, controller 400 may include one or more controllers housed in a common housing or multiple housings.

[0044] Memory 404 may include any storage medium known in the art suitable for storing program instructions executable by one or more associated processors 402. For example, memory 404 may include a non-transitory storage medium. By another example, memory 404 may include, but is not limited to, read-only memory (ROM), random access memory (RAM), magnetic or optical storage devices (e.g., magnetic disks), magnetic tape, solid-state drives, etc. It should also be noted that memory 404 may be housed together with one or more processors 402 in a common controller housing. In some embodiments, memory 404 may be remotely located relative to the physical location of one or more processors 402 and controller 400. For example, one or more processors 402 of controller 400 may access remote memory (e.g., a server) accessible via a network (e.g., the Internet or an intranet).

[0045] Figure 5 A process flow diagram depicting a method 500 for powering a server rack according to one or more embodiments of the present disclosure is shown. Method 500 may be utilized by power system 200, power system 300, and power center 204, power center 304 described herein.

[0046] In one implementation, method 500 includes a step 502 of receiving utility power, wherein receiving utility power includes receiving an input AC voltage. For example, the utility power may include a medium input AC voltage equal to or greater than 600V or a low input AC voltage equal to or less than 600V.

[0047] In one implementation, method 500 includes a step 504 of converting input AC to output DC voltage. For example, the input AC may be converted to output DC voltage via a solid-state transformer or other rectifier within power center 204, power center 304, or other rectifier devices.

[0048] In one implementation, method 500 includes a step 506 of storing the output DC voltage as stored energy. For example, the output DC voltage may be stored in battery 106. Battery 106 may be a standalone battery, a battery 106 included within power center 204, power center 304, and / or a battery 106 as part of an uninterruptible power supply (UPS). UPS includes any type of battery system as described herein.

[0049] In one implementation, method 500 includes step 508 of releasing the stored energy as an output DC voltage to server rack 102. For example, for a medium voltage power system 200, the stored energy can be released to a second busbar 230 electrically coupled to server rack 102. In another example, for a low voltage power system 300, power can be directly distributed to server rack 102 via a busbar or cable.

[0050] In an implementation, method 500 includes a step 510 where the output DC voltage is consumed by server rack 102, wherein the output DC voltage is not converted to AC voltage between the release of stored energy and the consumption of the output DC voltage. For example, the output DC voltage leaving battery 106 is not converted to AC at any point between the output DC voltage leaving battery 106 and the output DC voltage consumed by the plurality of servers in server rack 102. The output DC voltage can be adjusted (e.g., increased or decreased) as the DC power travels from battery 106 to server rack 102. Because the DC power released from battery 106 is not converted to AC power for transmission to server rack 102, but is instead converted back to DC power for use by the plurality of servers, energy loss and heat increase due to DC-AC-DC conversion, as well as the complexity of power systems 200 and 300, are reduced.

[0051] The topics described herein sometimes illustrate different components contained within or connected to different other components. It should be understood that the architectures depicted are merely exemplary, and many other architectures implementing the same functionality can actually be implemented. Conceptually, any arrangement of components implementing the same functionality is effectively “associated” to achieve the desired functionality. Therefore, any two components combined herein to achieve a particular function can be considered “associated” with each other to achieve the desired functionality, regardless of the architecture or intermediate components. Similarly, any two components so associated can also be considered “operably connected” or “operably coupled” to each other to achieve the desired functionality, and any two components that can be so associated can also be considered “operably coupled” to each other to achieve the desired functionality. Specific examples of operably coupled components include, but are not limited to, physically matched and / or physically interacting components and / or wirelessly interacting components and / or logically interacting components.

[0052] Those skilled in the art will recognize that it is common in the art to describe devices and / or processes in the manner set forth herein, and to subsequently integrate such described devices and / or processes into power and / or data processing systems using engineering practice. That is, at least a portion of the devices and / or processes described herein can be integrated into a data processing system through a reasonable amount of experimentation. Those skilled in the art will recognize that a typical power and / or data processing system typically includes one or more of the following: a system unit housing, a video display device, memory such as volatile and non-volatile memory, a processor such as a microprocessor and a digital signal processor, computing entities such as an operating system, drivers, a graphical user interface and applications, one or more interactive devices such as a touchpad or screen, and / or a control system including feedback loops and control motors (e.g., feedback for sensing position and / or speed; control motors for moving and / or adjusting the number and quantity of components). A typical power and / or data processing system can be implemented using any suitable commercially available components, such as those commonly found in power and / or data computing / communication and / or network computing / communication systems.

[0053] Furthermore, it is anticipated that each of the implementations of the methods described above may include any other step of any other method described herein. Additionally, each of the implementations of the methods described above may be performed by any system described herein.

[0054] Those skilled in the art will understand that, generally, the terms used herein, especially those used in the appended claims (e.g., the main part of the appended claims), are generally meant as “open-ended” terms (e.g., the term “including” should be interpreted as “including but not limited to”, the term “having” should be interpreted as “having at least”, the term “include” should be interpreted as “including but not limited to”, etc.).

[0055] While specific aspects of the subject matter described herein have been shown and described, it will be apparent to those skilled in the art that changes and modifications can be made based on the teachings herein without departing from the subject matter and its broader aspects, and therefore, the appended claims include all such changes and modifications within their scope, as well as the true spirit and scope of the subject matter described herein. Furthermore, it should be understood that the invention is defined by the appended claims.

Claims

1. An electric power system, comprising: A power center configured to convert an input alternating current (AC) voltage into an output direct current (DC) voltage, the power center comprising: Busbar flange, the busbar flange being configured to receive the input AC voltage from the first busbar; An AC converter, configured to receive the input AC voltage from the busbar flange and convert the input AC voltage into the output DC voltage; and The battery is configured to: Storing DC power; and The output DC voltage is released to the second bus slot.

2. The power system according to claim 1, wherein, The input AC voltage is equal to or greater than 600V.

3. The power system according to claim 1 further includes the second busbar trunking, wherein, The second busbar supplies the output DC voltage to multiple servers, which are powered by the output DC voltage without an intermediate DC-to-AC conversion step.

4. The power system according to claim 1, wherein, The AC converter includes a solid-state transformer.

5. The power system according to claim 3, wherein, The second busbar delivers the output DC voltage to the cooling distribution unit.

6. The power system according to claim 5, wherein, The cooling distribution unit is powered by the output DC voltage without an intermediate DC-to-AC conversion step.

7. The power system according to claim 5, wherein, The output DC voltage is converted into AC voltage to power the cooling distribution unit.

8. The power system of claim 3 further includes electrically coupling the second busbar trunking to one or more junction boxes of the plurality of servers.

9. The power system according to claim 3 further includes a backup power center and a backup second busbar capable of being electrically coupled to the plurality of servers, wherein, If the second busbar fails, the backup second busbar supplies backup output DC voltage to the plurality of servers.

10. The power system according to claim 3, further comprising the plurality of servers.

11. An electric power system, comprising: A power center configured to convert an input alternating current (AC) voltage into an output direct current (DC) voltage, the power center comprising: A tap box is configured to receive the input AC voltage from a first busbar. An AC converter, configured to receive the input AC voltage from the tap changer and convert the input AC voltage into the output DC voltage; and The battery is configured to: Store the output DC voltage; and The output DC voltage is released to multiple servers.

12. The power system according to claim 11, wherein, The input AC voltage is equal to or less than 600V.

13. The power system according to claim 11, wherein, The multiple servers are powered by the output DC voltage from the battery without any intermediate DC-to-AC conversion step.

14. The power system according to claim 11, wherein, The AC converter includes a solid-state transformer.

15. The power system according to claim 11, wherein, The power center delivers power to the cooling distribution unit.

16. The power system according to claim 15, wherein, The electricity includes AC voltage.

17. The power system according to claim 15, wherein, The power includes DC voltage.

18. The power system according to claim 13, further comprising the first busbar trunking.

19. The power system of claim 13, further comprising a backup power center electrically coupled to the plurality of servers, wherein, If the power center fails, the backup power center supplies backup voltage to the multiple servers.

20. A method for supplying power to a server rack, comprising: Receiving public power, wherein receiving said public power includes receiving input alternating current (AC) voltage; Convert the input AC voltage into the output DC voltage; The output DC voltage is stored as stored energy. The stored energy is released to the server rack as the output DC voltage; and The output DC voltage is consumed by the server rack, wherein the output DC voltage is not converted into AC voltage between the release of the stored energy and the consumption of the output DC voltage.

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