To satisfy this one requirement, industry established alliance of power source module recently (Power Stamp Alliance, PSA) , aim to come true to be offerred for the client undertake choosing between compatible solution, make at the same time power source manufacturer the two-way target that be able to compete and can offer optimal technology solution for global client.

 

In the article, one of virgin members of PSA ——Flex company, will discuss include to give out the standard that compatibility defines inside new alliance the advantage to the client, and 48V direct changeover is led in data center equivalent sensitive model the advantage in application.

 

Contemporary the policy that supplies chain management to reach a lot of companies asks, to designing medium key (if not be all) yuan parts of an apparatus, want to offer an equipment to choose origin at least. This can protect OEM manufacturer not to suffer worry of place of problem of be in short supply, make there can be the competition ability of certain level between the supplier, ensure cost gets controlling thereby.

 

However, industry of power source module is enclosed with what each supplier develops themselves all the time famed with mechanical appearance. This is meant, although change,the supplier is likely, but this is involved normally redesign the problem such as new facility of PCB and new attestation. This can introduce cost not only, and likelihood the process is lengthy, also involve risk element at the same time.

 

Offer the standardization of certain level to solve this problem, industry of power source module already appeared a lot of alliance. Although among them a lot of Dou Han covered current product, dan Relian alliance can be dedicated be in finite but main however technology field, right the client’s influence often more advantageous.

 

One of newest alliance are PSA (Www.powerstamp.org) —— this alliance is very dedicated at although this technology is usable also,facing the —— of module of advanced big electric current of processor, memory and ASIC at other applying.

 

The main goal of PSA is to be 48V nominal the solution of module of standard power source that voltage changeover is output of low voltage of big electric current to provide much source. To accommodate as far as possible much parts of an apparatus offers prospective applicability, PSA framework is in power comsumption / voltaic respect is had complete but expansibility.

 

PSA decision is dedicated be based on meaning law semiconductor at be only (ST Microelectronics) regulation of power source module is enclosed and function, and electric function is decided by firm of every PSA member.

 

Although current member includes PSA only Flex, Artesyn Embedded Technologies, Bel Power Solutions and meaning law semiconductor these 4 virgin members, but the other company that develops PSA compatible product also can be joined, and let a client can have more choices.

 

PSA returns a regulation, module should use existing craft to make, can undertake with the least risk large quantities of quantities are produced thereby, ensure the product has good usability then, so that safeguard,supply chain.

 

In systematic level, PSA is based on the module of 100A capacity; The system can be configured amount to 6 module (one advocate module and amount to 5 from module) , and the capacity that provides 600A for the system. If be in working process,voltaic demand decreases, so inside buy controller will be banned automatically with from module, ensure thereby arrive in 100A inside the limits of wide electric current of 600A reach optimal efficiency level.

 

Although the mechanical crust of PSA equipment is fixed, but go to the lavatory for utmost ground user, crust already was defined according to application. Design personnel can configure 4 PSA module in 58mm×58mm processor at the same time, this is meant the electricity that is as high as 400A can be generated in processor this locality, and need not longer big electric current takes a line.

 

2 side of PSA solution use digital control completely, the user can pass PMBus AVS or standard SVID undertakes controlling to module. These standards come true completely in module interior, and make power source solution can undertake optimizing in the light of any specific application.

 

For example, in the application that has two VR13-HC processor and two DDR memory bar, every processor needs to be as high as the electric current of 400A, every memory bar needs 200A electricity.

 

 

Graph 1: The typical PSA that has two CPU and two pairs of memory bar applies (origin: PSA)

 

 

The power demand of this kind of system can come true through using module of many power source. Advocate power source module can act as already reach 5 control level from module, but oneself provides the electric power that is as high as 100A. These can provide the electric power that is as high as 100A every from module, and only by advocate modular block control, do not need to use direct user interface from module. Because laden trends changes, advocate module can be banned automatically with (enable afresh) any do not need from module, ensure thereby achieve optimal efficiency from beginning to end.

 

 

Graph 2: In older system, advocate module can control from module (origin: PSA)

 

Graph word: Input power source; Control; 100A advocate module; Isolator; 100A from module; Segregation; Output power source; Can expand to 600A from 100A

 

Advocate module and the dimension from module and enclose all define by PSA, of two kinds of module enclose identical. Advocate module has an alone control PCB, in its coping embedded one has LGA solder from module dish terminal, and from module use module cites a base. The layout that cite a base is the subject that industry thinks extensively and discusses all the time, accordingly PSA constitutes similar signal together and place its around the brim, in order to make the engineer can have the link between module easily. Ground connection joins configuration is near module center.

 

Design personnel can visit referenced design through any PSA members board, so that undertake fast prototype to be based on the power source solution of PSA module,be designed and develop. The PSA that PSA member is being developed or can have offerred output voltage to be 0.9V, 1.0V and 1.8V adds up to compasses module.

 

 

Graph 3: PSA member firm can offer now use at the reference that evaluate quickly and develops board (origin: PSA)

 

The advantage of direct changeover
 

One of characteristics with the markeddest PSA are, it can come true from nominal the direct transition that 48V distribution course needs voltage to laden place. Till recently, telecommunication and data communication power source use two class changeover, use converter of intermediate bus line (IBC) course of distribution of 48V of half stabilized voltage changeover is 12V.

 

In framework of this kind of intermediate bus line (IBA) in, IBC offers changeover of the first class and systematic segregation. Next, blame segregation is bit ladener (NiPOL) offer the 2nd class to change —— it the voltage that 12V intermediate course changeover is laden place to need, namely the low voltage that processor, memory and ASIC need normally.

 

 

Graph 4: Two class changeover uses the IBC that takes independent NiPOL (origin: Flex)

 

Graph word: Communicate line; Segregation, changeover, stabilized voltage; Bus line of distribution of half stabilized voltage; Bus line converter; Segregation, step-down; Stabilized voltage keeps apart intermediate bus line partly; NiPOL converter; Step-down, stabilized voltage; Stabilize laden voltage

 

Although this kind of method is had,include only place to keep apart (can reduce total system cost) inside a lot of advantage, but main drawback is compare efficiency with only course changeover relatively inferior.

 

 

Graph 5: Direct changeover changes efficiency than two class normally taller (origin: Flex)

 

Graph word: 12V bus line; 48V bus line; Traditional two class 48V is changed to Vcore; IBC (48V-12V) ; 96% efficiency; POL (12V-1V) ; 90% efficiency; Overall efficiency is 86.4% ; Direct 48V is changed to Vcore; Come directly Vcore converter; ＞ 91% or taller efficiency

 

Although IBC and NiPOL are alone the efficiency when using is taller (typical cost is respectively 96% and 90% ) , but this kind of method can make to laden overall changeover from 48V efficiency falls to 86.4% . Under photograph comparing, the only course such as PSA module keeps apart converter to be able to issue implementation ＞ in target load the efficiency of 91% .

 

If we go considering to need the typical processor of 600A below 1VDC / memory application, so efficiency can arise for the two class changeover of 86.4% about the quantity of heat of 94.4W, and only course changeover can reduce this one cost 35W to 59.4W.

 

A of this kind of method additional benefit is, because be the class that use sheet,changeover undertakes allocation to 48V, 25% the electric current in its generatrix will be the electric current in allocating the two class of 12V to change a system. Accordingly, the loss in bus (I2R) the 1/16 that will reduce two class system.

 

Although these numbers look very small, but the combination of they and single processor and memory is concerned. Although be in,the data of average volume also can have thousands of processor in the center, bring because of every processor a few saving cumulative rise to also can become very tremendous. This can make moving cost gets reducing not only, and can make power comsumption drops about 50% . This is meant can be in to it before offer inside same space get much electric power more, or power source can be accomplished smaller.

 

Summary
 

For the company that builds the system that is based on processor to compose, efficient power source is changed and choose but the supplier of power source solution that each other operates is his two important agenda. PSA changes the over all dimension of power source module and core function through defining only course, had achieved two afore-mentioned goals, make the supplier is able to continue to compete at the same time, and the will most efficient advanced technology solution is pushed to the market.