K1 l1 l2 l3 1 the last entry in the k statement is the coupling coefficient, which can vary between 0 and 1, where 1 represents no leaka. Saturablecore spice models boost intusofts magnetics. Compared to older core models, the chan model is particularly robust, computationally efficient and compact, requiring only three parameters to define most any commonly encountered magnetic hysteresis loop. Transformer cores are typically made from a ferrous material, but this creates problems for modeling because its nonlinear in that it has hysteresis and saturates. Ltspice is freeware computer software implementing a spice electronic circuit simulator, produced by semiconductor manufacturer linear technology, now part of analog devices. Ltspice iv is a free, highperformance, spice simulator software by linear technology which is widely used in the industry. Use simulation circuits posted on the ltspice yahoo. Though iv is still available for download, it is no longer maintained.
Fig 1 shows the jig of the ltc3878 external fet buck converter with a resistive load of 80mohms. A simulation model for the saturable reactor, an electromagnetic devices widely used as a protective element for the thyristor circuit, is presented. The spice solver does not handle discontinuous functions, so it internally adds a gmin conductance across every pn junction. The source voltage and first resistance before opamp is 9 v and 3. Gardena, ca december 27, 2005 intusoft announced today the addition of several saturablecore magnetic spice models and new core materials to its inductive design and synthesis product, magnetics designer. How do i define a voltage or currentdependent inductor in ltspice. Multithread the heck of it, abuse simd extensions, almost everybody as at least a dual core x86, lots of laptops dont even have dedicated graphics im aware of this.
Stable spice circuit simulation with unlimited number of nodes schematicsymbol editor waveform viewer library of passive devices fast simulation of switch mode power supplies steady state detection turn on transient step response efficiency power computations advanced analysis and simulation options. Ltspice transformer library, transformer design, flyback. Unicode use any character of any living language, new device equations igbt, soft recovery, and an arbitrary state machine, editors for most spice syntax commands, extensions to microsoft windows for. How do i model a saturable inductor using a magnetic core and. Its a circuit that contains a ne555 chip and a 9v dc voltage source. Jan 07, 2016 download lt spice components to your component library. The theory of magnetic amplifiers is dated, but its simplistic design has benefits for modern applications. The square orthonal material is normally used in special applications.
This paper explains, in depth, how to create spice models for the most important and. Ltspice xvii is an analog circuit simulation software tool. How do i model a saturable inductor using a magnetic core. Magnetics designer is an option to intusofts icap4 analog and mixedsignal spice simulation tool suite.
Yes, that would be the nice way to do it, but the change in the exponential function at the 10% point on the falling slope of pulse 5a is very difficult to model mathematically over the full range of possible pulse parameters without introducing a. Transformers and coupled inductors are key components in many switching regulator designs to include flyback, forward and sepic converters. November 8 1993 abstract the nonideal inductor exhibits both resonance and nonlinear current characteristics. Therefore, a saturable core macro model, utilizing the isspice subcircuit feature, must be created. To make it saturate, i have to use the magnetic core and coreless coil, which is fine. It improves simulation accuracy with advanced modeling, multithreading support, devicestate plotting, realtime waveform viewing, and analysis, and a command wizard for simple. As a result, its effective impedance reduces below that without saturation. And here is the reference for the paper the article was based on. It is used inhouse at linear technology for ic design, and the most widely distributed and used spice program in the industry. Hi, mral, thank you for your kind help, the model can work well for inductor saturation modeling, you are right that the tanh and arctan have some differences, and i tuned the parameters to make the simulated results match the measurement results because i use the arctan function.
This ltspice tutorial digs deeper into circuit analysis with ltspice. Model libraries for linear technology ltspice switchercad. What kind of simulation should i do in order to view the output waveform, in a. Magneticamplifier analysis using a generalized model for the saturable reactor core by herbert horace woodson submitted to the department of electrical engineering on may 14, 1956, in partial fulfillment of the requirements for the degree of doctor of science. We wish to warn you that since tanner tools with ledit and tspice files are downloaded from an external source, fdm lib bears no responsibility for the safety of such downloads. What we have learned so far enables us to simulate most designs. The ltspice saturating inductor model introduction and power. I took a bh loop of the core i want to use, input points into the data for the magnetic core, then i the appropriate number of turns on my coreless coil. They perform critical function in providing an isolation barrier, enabling high stepdown or stepup ratios and accommodating multiple or inverting outputs. Included in the download of ltspice are macromodels for a majority of analog devices switching regulators, amplifiers, as well as a library of devices for general circuit simulati. Saturable core reactors an overview sciencedirect topics. Gardena, ca december 27, 2005 intusoft announced today the addition of several saturable core magnetic spice models and new core materials to its inductive design and synthesis product, magnetics designer.
This would allow you to have an inductor which was a constant vale from zero to x2 amps. Download lt spice components to your component library. It is designed to run on windows 2k, xp, vista, 7 with a processor that contains a minimum instruction set similar to a pentium 4 processor. This is an overview of ac and dc simulation, as well as how to analyze output signals. May 02, 2020 download ltspice simulate switching regulators and analog circuits with this application, which comprises a variety of components that you can integrate into your schemes. Hello, anybody know how to do a saturable inductor in ltspice. X1 2 0 3 core vsec50u ivsec25u lmag10mhy lsat20uhy feddy20khz figure 5, to make the netlist for the saturable core subcircuit spice compatible, just replace all the equations in the curly braces with numerical values. Magnetic amplifiers for voltage regulation applications core. This paper explains, in depth, how to create spice models for the most important and pervasive element in power electronics, that of the transformer and its accom. And ltspice then will model saturation and hysteresis.
Ltspice iv is a high performance spice iii simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators. Ltspice iv is a high performance spice simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators. The enhancements to spice have made simulating switching regulators extremely fast compared to normal spice simulators, allowing the user to view waveforms for most switching regulators in just a few minutes. The saturable reactor cannot be modeled using a single spice primitive element. Basic circuit simulation with ltspice technical articles. Rp 1 2 1meg saturable core spice model of power transformer spice transformer simulation xfmr spice saturable ideal transformer text. Download ltspice simulate switching regulators and analog circuits with this application, which comprises a variety of components that you can integrate into your schemes. Magnetic amplifiers for voltage regulation applications casey morgan ogrady university of arkansas, fayetteville. Here is the simple approach to simulate a transformer in ltspice iv.
Modeling nonideal inductors in spice martin ohara technical manager, newport components, u. Jan 04, 2012 core model ltspice model by bee technologies inc. Depending on the inductor series, the advanced spice models may include a variable inductor element, variable series resistance rvar1 to model skin effect, a resistor element in series with the parallel capacitance r1 to limit impedance at resonance, and a variable parallel resistance rvar2 to model frequencydependent low power core losses. Jul 30, 2015 basic circuit simulation with ltspice july 30, 2015 by trevor gamblin ltspice is a versatile, accurate, and free circuit simulator available for windows and mac.
The tanner tspice simulator, part of the tanner tool suite, integrates easily with other design tools in the flow and is compatible with industryleading standards. Ltspice is not artificially crippled to limit its capabilities no node limits, no component. In the box, type in k1 l1 l2 k, where k is the coefficient of coupling. Jan 04, 2012 simple model of transformer using ltspice 1. The program lies within education tools, more precisely science tools. Coilcraft sparameters and spice models are used in nuhertz technology filter synthesis and analysis software. Furthermore, two saturable inductors can be aligned in antiparallel to create a magnetic amplifier.
I have built a circuit where the 555 is supposed give an output ac voltage. Parameter settings of saturable core model parameters. This free program is an intellectual property of linear technology corporation. Saturable reactors have a nonlinear voltagecurrent characteristic so that when the voltage across the reactor rises above a certain threshold, the reactor current increases disproportionately due to core saturation. The jiles atherton model is useful for modeling these effects. Here is the spice code for a saturable core just in case the link goes down here is an included picture of the model this is a graph of a modeled core. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. This article will go over a few advanced functions. Each magnetic material is described by a bh curve, and this chapter will explain that concept. Draft an inductor for each transformer winding couple them using a single mutual inductance k statement via a spice directive. Contribute to aempireiltspice ivmodels development by creating an account on github.
Know more about sparameters and spice models coilcraft. Use the link below and download tanner tools with ledit and tspice legally from the developers site. Press t to get the enter text dialog and check the spice directive box. Abstract a mathematical representation for a polycrystalline. So, the expected output voltage should be vout 9 3. I would think there would be an inductor type component somewhere in ltspice which has dialog entries for inductance at current zero amps, then inductance at current x2 amps, then inductance at current x3 amps. However the whole motivation for the fast ltspice solver is for lts chip designers, not your typical engineer that simply doesnt need the speed. Included in the download of ltspice are macromodels for a majority of analog devices switching regulators, amplifiers, as well as a library of. The file size of the latest installer available is 37. You can read out the inductance as vn001 since current source i1 supplies a unity didt.
Apr 19, 2008 mike engelhardt put together an interesting range of saturable magnetic structures that were dependant on varying parameters. Ltspice is node unlimited, incredibly easy to learn and can be used to simulate most of the analogue components from linear technology as well as discrete and passive components. Problem with opamp simulation in ltspice all about circuits. Transformer modeling and design for leakage control shi ping hsu, r. Something smaller is used for air core transformers. Wurth elektronik eisos offers you the ltspice component library with a filter search function to find the right product.
Intermediate ltspice tutorial august 04, 2015 by trevor gamblin ltspice possesses several features that can be used to test your design beyond simple transient analysis and ac sweeps. This download was scanned by our antivirus and was rated as. Ltspice is capable of several types of analysis, only three of which are described belowdcset all voltagecurrent sources to their initial or bias state, and solve for all node voltages and device current, and print them in tabular form. Ltspice was originally called switchercad, but that name was removed when iv was released. Ltspice is a high performance spice simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits. That can be seen in the above where the forward and reverse voltages are connected in the zero current region. A call to the saturable core subcircuit using isspice would look like the following. Arbitrary saturable coupled inductors in ltspice page 1.
In addition theres four other things that we need to tell ltspice that relate to the geometry of the inductor core which are shown here. Yes, ltspice comes with a nonlinear hysteretic core model built in. This program is a partial rewrite of ltspice iv with a modern graphics library for native multimonitor support. Ltspice iv presentation szechenyi istvan university. Normally use 1 for k in case of a toroid or power transformer. Do you know of something better suited for this task and still free, as. Check out the next video to learn how to model mosfet transistors in spice.
Download ltspice iv xvii b mar 25 2 free offers free software downloads for windows, mac, ios and android computers and mobile devices. If you continue browsing the site, you agree to the use of cookies on this website. The saturable core model is capable of simulating nonlinear transformer behavior including saturation, hysteresis, and eddy current losses. In the case of a resistor i simply write r100vvkey, but the simulator refuses to. I have been trying to model a saturable inductor so as to make a magnetic pulse compression circuit, but have been coming up against a number of barriers. Lt spice does have a non linear model, but the problem is still relating it to physical parameters. Hello, recently i have some problem with simulation in ltspice for operational amplifier inverting amplifier circuit. Saturable transformer model simplified spice behavioral model bee technologies inc. Ltspice solves for the magnetic fields in the core and gap under the assumption of uniform cross sectional area and thin or uniformly distributed gap.