The objectives of this thesis are to design planar magnetic devices based on accurate. The planar transformers come in standard sizes and with hundreds of lead frames and pcb windings in stock. Traditional, often line frequency current transformers, hall effect current transformers and switchmode power supply smps current transformers are examined in depth. Net ties are components that allow multiple separate nets connected via smt pads. Is there anyone who can give some suggestion on doing the planar transformer. Pqc is a technology leader in the field of high frequency planar power magnetics ranging from 10w to 30 kw. Magnetics designer software makes transformer and inductor design easy magnetics designer is a standalone software program for windows that designs all types of layer and sectorsplit bobbin wound transformers and inductors, and generates a corresponding spice model. Topic 4 designing planar magnetics texas instruments.
They can replace conventional details on one or multilayer printed circuit boards. Magnetic builder magnetic design software, inductor and transformer design tool poweresim is a free webbased software providing power supply smps design, transformer design, magnetic design, loss analysis, thermal analysis, waveform analysis, mtbf analysis, bom building, dvt analysis and optimization of power supply smps. A planar inductor is a helical pcb trace, residing under a ferrite magnetic core installed on the pcb. When designing planar transformer pc windings, designers use the same technology used by the printed, circuit board designers, and that is the current rating for a given voltage drop and temperature rise.
The magnetic core of the transformer is made of a ferrite material while its windings are printed in cooper pcb boards with a spiral shape of a layout. But there is a limitation on the height so i am not able to use the traditional transformer i used to use. High voltage planar transformer is a technology which can replace conventional transformer with its distinct advantages of saturation and cost efficiency. With planar technology, instead of constructing magnetics components as transformer and inductors of wirewound assemblies on bobbin, the planar pcb magnetics take benefits from using pcbtracks as windings. Sep 23, 2003 model and design of pcb parallel winding for planar transformer abstract. Creating planar transformers in altium designer youtube. The unique p025 p1100 product line of planar transformers are equiped with a patented header and terminal design yielding superior thermal management. Calculating performance of planar magnetics 6 any and all ansys, inc. Main design considerations for planar here are flatness and high frequency electrical. Examines how a planar inductor or transformer core could be made from a net tie component in altium designer. The unique 025 2100 planar transformer product line.
A compact planar transformer of a new design was analyzed in this paper. Coreless planar printedcircuitboard pcb transformers a fundamental concept for signal and energy transfer s. This paper discusses the magnetic fields within the planar structure and their effects on the distribution of high frequency currents in the windings. We changed the voltage ratio by using different seriesparallel connections. Additionally, the main manufactured elements a coil made of pcb winding and ferrite magnetic core are collected. Ecores are commonly used to wedge pcb winding or copper. Model and design of pcb winding parallel for planar transformer. Another thing to think about is would a planar transformer be the best solution. Aerospace planar transformers for switchmode power. The biggest challenge for me is always on the software usage side because there are so many tools available. Software to predict the current density distribution and ac loss for planar windings has been developed. The design of a multilayer planar transformer for a dcdc converter.
With planar transformers the word planar can somewhat distract from what it is. The benefits of planar magnetics in of power conversion. Planar inductors can be overlapped on multilayer boards to design planar transformers on the printed circuit board. Click here for a summary of our newest planar transformers and a detailed description for determining losses and overall efficiencies. The tida00688 reference design provides isolated 15v and 5v outputs in a very thin form factor with only 2.
Model and design of pcb parallel winding for planar transformer. Mar 07, 2012 introductionplanar transformers can be constructed as stand alonecomponents, with a stacked layer design or a smallmultilayer pcb, or integrated into a multilayer board of the 12 planar e corepower supply. Hi all, i want to draw a planar transformer cell on pads layout and associate a symbol to create a part. You cant use simulation to design planar magnetic transformers. With planar transformers the word planar can somewhat distract from what. The 2oz cu plating on the outer layers of the main transformer board allows for placement of the surface mount components that make up the remainder of the dc. The model utilizes the 1d analysis of maxwells equations to develop a frequencydependent. Transformer design software integrated engineering software.
Consequently, a software platform for magnetics design is established. However, they dont perform as well as conventional transformers when used in a flyback topology, and since they are relatively uncommon, finding one that meets your specifications can be difficult. Magnetics builder design magnetic inductor and transformer. Strategies for optimizing planar design are presented, and illustrated with design examples.
Planar pcb transformer model for circuit simulation abstract. Gain of transformer versus operating frequency of tr7 with c pf. Designing with the pla51 planar transformer for enhanced power density and efficiency. Making planar transformers in altium electrical engineering. Net ties are components that allow multiple separate nets connected via smt pads to.
Aerospace planar transformers for switchmode power supplies. This is achieved by integrating the transformer directly into the pcb. Planar cores, ferrite planar cores, software tool for designing. Jul 21, 2016 hi all, i want to draw a planar transformer cell on pads layout and associate a symbol to create a part. When various windings of the inductor are placed directly on the printed circuit board, each winding is composed of routing tracks creating the various inductor coils. Magnetics designer software makes transformer and inductor design easy. Calculating performance of planar magnetics 2 the transformer consisted of four windings having eight layers and 38 turns total. When it comes to standex electronics custom transformers custom is standard. Strategies for optimizing planar design are presented, and illustrated with design. Planar transformers can be constructed as stand alone components, with a stacked layer design or a small multilayer pcb, or integrated into a multilayer board of the power supply.
This integrated planar transformer consists of a main transformer board sandwiched between two small winding boards, in a ferrite ei core. Planar magnetic devices offer several advantages over their conventional counterparts. Chapter 20 planar transformers university of north. In this work, design of a multispiral stacked solenoidal inductor for bio. Planar inductor pcb layout gendreau microsystems, inc. An equivalent circuit model for planar printed circuit board pcb transformers is presented. Planar magnetics design for lowvoltage dcdc converters. The transformer was analyzed without the core and with the. Integrated planar components are used if the complexity of the surrounding circuitry already demands for multilayer pcb. A multilayer planar transformer the geometry of the analysed multilayer planar transformer with fundamental dimensions is presented in figure 1. We are an american company with a worldwide presence. Magnetic cores used with planar devices have a different shape than conventional cores used with helical windings.
What you might want to look at is mutually coupled coils first, perhaps you already have. Sometimes, the strength is in what you can access combined with the ability to use a pcb design program for free. Designing with the pla51 planar transformer for enhanced. Quickly find the best current transformer or current sensor for your application. Magnetics current transformer design software assists design engineers in choosing the most appropriate core material and size for a number of current transformer ct topologies. Ron hui, senior member, ieee, and henry shuhung chung, member, ieee abstract magnetic cores have been used in transformers for over a century. Decrease the time used to generate planar transformers dramatically using this tool. Design, modeling, and analysis of a compact planar transformer. A planar transformer is essentially a transformer that uses flat windings, usually on a printed circuit board, instead of copper wire to form the coils. Jun 27, 2008 examines how a planar inductor or transformer core could be made from a net tie component in altium designer. This is the case with pads maker software package by mentor, a siemens business, which is now available from digikey.
Features integrated planar transformer wide input voltage range 14v to 36v 24v nom three isolated outputs 1. I have a new dcdc requirement from 48vdc to 52vdc and 24vdc for slic battery feeding. Magnetic builder magnetic design software, inductor and. Design, modeling, and analysis of a compact planar. Unlike conventional wirewound inductive components windings of inductors based on planar cores are printed on pcb. Basically this is a construction method of inductive components whose windings are created from multilayer printed circuit boards. Free design software provides a means to test the product before moving up to more featurerich platforms. Main planar transformer board the main transformer board is comprised of 6 4oz layers and 2 2oz layers in an 8 layer pcb. Introductionplanar transformers can be constructed as stand alonecomponents, with a stacked layer design or a smallmultilayer pcb, or integrated into a multilayer board of the 12 planar e corepower supply. Design and optimization of printed circuit board inductors for wireless power transfer system. Planar pcb transformer model for circuit simulation.
Enabling printed circuit board pcb designers to seamlessly connect schematic diagrams, component placement, pcb routing, and comprehensive library content. Does anyone have a recommendation for building a planar transformer. Complete designs for a forward and a flyback transformer are given. In todays highfrequency lowprofile switchingmode power converters, paralleling winding in planar transformers is needed, especially for low voltage and high current applications. Designing with the pla51 planar transformer for enhanced power density and efficiency application note. The design of a multilayer planar transformer for a dcdc. Pdf this paper presents a new design of a planar transformer. Planar cores, ferrite planar cores, software tool for. Model and design of pcb parallel winding for planar.
Planar transformers can be constructed as stand alone components, with a stacked layer design or a small multilayer pcb, or integrated into a multilayer board. Drawing out the tracks and checking tracespace clearance manually is a pain not to mention unreliable. We design, produce and market stateoftheart planar transformers and inductors for aerospace, military, and commercial applications. Relatively planar transformer design, can be divided into several types. Coreless planar printedcircuitboard pcb transformers. May 29, 2015 a planar transformer, the primary component used in switchmode power supplies, offers volumetric efficiency and a lower profile over traditional wirewound transformers because it uses printed. Planar spiral inductor design process pcb design cadence. Model and design of pcb parallel winding for planar transformer abstract. Introduction the need for compactness in power converter has led to the increase in operation frequency and the use of planar magnetics. Eagle is an electronic design automation eda software. Software tool for designing flyback transformers based on planar cores.
This type involves insertion of the windings into the motherboard. You can experiment with the number of turns, dcr and the location of the windings within the assembly interleaving. A novel methodology based on fem simulation is proposed. Pcb layout software packages typically have trouble directly drawing complex curved routes like spirals, splines, and ellipses. Planar transformer designers handle the current density in a different way. This seem to be easy but i have a problem because each coil of the transformer has the same net name at each end and i cannot attach different pads at each end of coil track. This paper includes, study and solution methods for pcb winding configuration in planar magnetic elements with multilayer. Front end design synthesis software streamlines the model creation. The pcb layout of the forward transformer is included. The model utilizes the 1d analysis of maxwells equations to develop a frequencydependent representation of a multilayer, planar pcb transformer that can be implemented in the circuit simulation software. Hinged planar components they are closest to the conventional inductive components. Design and optimization of printed circuit board inductors. After that fem simulators are introduced to numerically compute the winding loss.
Topologies include half bridge, forward wactive rest, flyback. Planar pcb transformer model for circuit simulation ieee. Magnetics designer produces a complete transformer or inductor design based upon electrical specifications, including a winding sheet report and a spicecompatible model with parasitics. Characterization of coreless printed circuit board pcb. Further, formvar, square or double square magnet wire, litz wire, pcb traces. In general, there is not a huge difference between implementing a planar transformer versus a comparable conventional transformer in a dcdc converter design. The 2oz cu plating on the outer layers of the main transformer board allows for placement of the surface mount components that make up the remainder of the dc dc converter circuitry. Magnetics designer is a standalone software program for windows that designs all types of layer and sectorsplit bobbin wound transformers and inductors, and generates a corresponding spice model. I designed a dcdc converter a few years back that used such a transformer. Standexmeder electronics is a global leader in the design, development, and manufacturing of standard and custom planar transformer solutions. Using ferritic core, the inductance was increased for 22% in comparison with coreless transformer. Typical applications can be found in low power conversion and signal processing and use mostly e plate combination of the small sizes.
The pcb construction creates a different form factor that offers some unique advantages and a few tradeoffs. Planar transformer pcb design cadence technology forums. Spiral printed circuit board pcb inductors are gaining attractions for wireless power transfer ap plications due to their various advantages over conventional inductors such as lowcost, batch fabrication, durability, manufacturability on flexible substrates, etc. However, youll see that some free offerings are used for designs that are quite complex and provide access to a number of tools and information. This 15 page application note presents a fast and easy method to design planar transformers based on the ferroxcube range of planar e cores. Using planar transformers dcdc converter designs digikey. You can use a ferrite core that goes through holes in the pcb, which is called a planar transformer or inductor. The height of the planar attachment component may be reduced by immersing the core in the recess of the pcb. Its nice hearing what people actually use and how they use it. Pcb planar inductors are widely used in rf applications. Planar transformers can be used in forward, pushpull, and full bridge half bridge topologies at frequencies from 100 khz to 500 khz. Construction of planar cores offer significant advantages including. Introduction to planar magnetic pcb design terratel.
Main advantages are the simplification of assembly and no longer. Energy efficiency of transformer versus operating frequency of tr7 with c 100 pf. In this winding must lie on the surface of the board. A wide variety of pcb planar transformer options are available to you, such as power, high frequency, and electronic. Design of planar power transformers elna magnetics. Index terms coreless pcb transformers, planar transformers and windings, printed circuit board transformers. Our planar transformer design capability combines excellent engineering with delivering a solution that not only saves you space, time, and costs, but suits your needs uniquely and specifically. We would like to create an orcad symbol and an alegro footpint. The drc will flag any other short circuit violation between these differing nets elsewhere in the design. View the kit manual this is the kit used by coilcraft designers to provide fast turnaround of planar transformer samples. Tang et al coreless planar printedcircuitboard pcb transformers 933 fig.
The transformer was analyzed without the core and with the core. Design of planar transformers, application note, ferroxcube. Throughout my 25 years in the computeraided engineering industry, some of the smartest people i know have told me that you cant use simulation to design planar magnetic transformers. Coreless planar printedcircuitboard pcb transformers a. For a square coil as youve shown, just set up the grid so that snapping to it will give you the correct centercenter spacing of your turns. Does anyone know of a decent repeatable way of making planar transformers planar inductors in altium. While the free version is limited, those limitations are not severe.
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