Built for Space-Constrained Server Power Architecture

Modern server power supplies are expected to deliver increasing output power without a proportional increase in PSU size. As capacitors, switching devices, heat sinks and control circuits compete for limited PCB area, the physical size of magnetic components becomes an important part of the overall power supply design.

A PQ core provides a practical magnetic structure for this type of application. Its geometry offers useful winding space while maintaining a relatively compact footprint, allowing engineers to balance transformer size with the layout requirements of the surrounding power components.

For server PSU projects, the transformer should therefore be considered as part of the complete power stage rather than selected only by core model.

Why PQ Core Geometry Matters in a Server PSU

A transformer that is too large can create PCB layout problems even if its electrical performance is adequate. A design that is too compact, on the other hand, may leave insufficient winding space or thermal margin for continuous operation.

PQ-series cores provide several size options for matching different board layouts and power-stage requirements. Common PQ formats can be evaluated according to the available installation area, winding arrangement, switching circuit and expected operating conditions.

This gives power supply designers more flexibility when working within standardized server PSU dimensions.

Managing Current and Heat Under Continuous Load

Server power supplies may remain energized for long periods and frequently operate under sustained load. Transformer losses that appear manageable during short tests can become a thermal concern during continuous operation.

Core selection, conductor arrangement and winding structure therefore need to be considered together.

For higher-current designs, copper foil winding can be used where appropriate to the circuit requirements. The final conductor structure should be selected according to current, frequency, winding space and temperature-rise targets rather than applying one winding method to every PSU design.

PCB Integration Without Wasting Valuable Board Space

Magnetic components are often among the taller and larger parts inside a server power supply. Their location can affect airflow, heat sink placement and the routing of high-current conductors.

A PCB through-hole configuration provides a straightforward method of integrating the transformer into the power assembly while maintaining a fixed component position during production.

The transformer footprint, terminal arrangement and core size can be coordinated with the PSU layout so that the magnetic component does not become an unnecessary obstacle to surrounding components.

Designed Around the Power Stage, Not a Fixed Transformer Specification

Server power architectures vary between platforms. Input and output requirements, converter topology, switching conditions and mechanical limits can all influence transformer design.

For this reason, the PQ transformer should be developed from the actual power-stage requirements.

Instead of forcing a standard transformer into an existing board, core size, winding arrangement, terminal configuration and mechanical dimensions can be evaluated together during the component selection process.

Key Specifications & Parameters

Product Name： PQ Core high frequency transformer for Server Power Supply

Transformer Series： PQ Series

Core Structure： PQ Type Magnetic Core

Available Core Sizes： PQ26 / PQ32 / PQ35 / PQ40 and Other Project-Specific Sizes

Winding Structure： Copper Winding / Copper Foil Configuration According to Design Requirements

Mounting Method： PCB Through-Hole Mounting

Installation Orientation： Vertical PCB Installation

Electrical Configuration： Developed According to Server Power Circuit Requirements

Operating Frequency： Determined by Target Switching Power Architecture

Input / Output Requirements： Project-Specific

Insulation Structure： Configured According to Working Voltage and Safety Requirements

Mechanical Dimensions： Determined by Core Selection and Available PCB Space

Target Application： Server PSU and Data Center Power Conversion

What This Transformer Helps Address

Limited PCB Space

PQ core geometry provides a useful balance between winding space and component footprint, making it suitable for power supplies where magnetic component dimensions directly affect PCB layout.

Increasing Power Density

As server PSU output density increases, transformer design must support the required power stage without unnecessarily increasing magnetic component volume.

Continuous Operating Load

Core and winding selection can be developed around sustained operating conditions rather than short-duration peak performance alone.

High-Current Winding Requirements

Different conductor arrangements, including copper foil where appropriate, can be evaluated according to the current and thermal requirements of the server power stage.

Repeatable PCB Assembly

Through-hole installation provides a fixed mounting position that is suitable for repeatable production of power supply assemblies.

Electrical Isolation

Primary and secondary winding structures can be arranged according to the isolation and safety requirements of the target converter.

Application Focus

Rack Server Power Supply

Rack-mounted servers require compact power supplies that fit standardized mechanical envelopes. PQ transformers can be incorporated into conversion stages where board area and component height must be considered alongside electrical performance.

High-Density Server PSU

Higher power density places greater pressure on magnetic component size and thermal behavior. The transformer can be developed around the available PCB footprint and operating conditions of the PSU.

Redundant Power Supply Module

Redundant server power systems often use compact, replaceable PSU modules. Magnetic component dimensions and installation consistency become important when multiple power modules must follow the same mechanical design.

Data Center Computing Equipment

Data center hardware operates for extended periods and requires dependable power conversion. Transformer design can be matched to the electrical and thermal requirements of continuously operating computing equipment.

Selection Information

When discussing a PQ transformer for a server power project, the following information is more useful than simply providing a PQ core number:

Converter Topology： Power-stage circuit structure

Input Requirement： Actual input voltage range

Output Requirement： Required output voltage and current

Switching Condition： Target switching frequency

Available PCB Area： Maximum component footprint

Height Restriction： Available vertical space inside the PSU

Cooling Method： Natural airflow or forced-air cooling conditions

Insulation Requirement： Required electrical isolation and safety considerations

Providing these conditions allows the transformer structure to be evaluated around the actual PSU rather than selecting a component only by appearance or core size.

FAQ

Q1: Why are PQ Core Transformers used in server power supplies?

PQ cores provide a useful combination of winding space and compact magnetic structure. This makes them suitable for power supplies where PCB area is limited but the transformer still needs sufficient winding capacity for the target conversion stage.

Q2: How should PQ26, PQ32, PQ35 and PQ40 be selected?

Core size should not be selected from the model number alone. The appropriate PQ size depends on the converter topology, power requirement, switching frequency, current, allowable temperature rise, winding structure and available PCB space.

Q3: Why is transformer size important in a server PSU?

A server PSU contains power semiconductors, heat sinks, capacitors, control circuits and magnetic components within a limited enclosure. An unnecessarily large transformer can interfere with airflow and surrounding component placement, while an undersized design may create electrical or thermal limitations.

Q4: Is copper foil always required for a PQ transformer?

No. Copper foil can be useful in certain high-current winding designs, but it is not automatically the best choice for every transformer. The conductor structure should be selected according to current, switching frequency, winding arrangement and thermal requirements.

Q5: What should be provided when developing a transformer for a server PSU?

Useful information includes circuit topology, input and output conditions, switching frequency, current, insulation requirement, maximum transformer dimensions, PCB layout restrictions and cooling conditions.

Q6: Can the same PQ transformer be used across different server power supplies?

Not necessarily. Two server PSUs may use similar PQ cores while requiring different winding ratios, conductors, insulation structures, terminals or dimensions. Transformer selection should follow the actual electrical and mechanical conditions of each project.