[introduction]The domain is emulated in electric power electron and circuit, precision is crucial. The authenticity of emulation result depends on the accuracy that place of each parts of an apparatus introduce a model. No matter be IGBT, carborundum (SiC) or silicon MOSFET, closely related the precision that emulates the dependability that forecast and model. Adage says well, “Rubbish is entered, rubbish goes out ” , namely if of the input is rubbish, so of output also is rubbish.

The domain is emulated in electric power electron and circuit, precision is crucial. The authenticity of emulation result depends on the accuracy that place of each parts of an apparatus introduce a model. No matter be IGBT, carborundum (SiC) or silicon MOSFET, closely related the precision that emulates the dependability that forecast and model. Adage says well, “Rubbish is entered, rubbish goes out ” , namely if of the input is rubbish, so of output also is rubbish.

Design personnel basis measures the character of parts of an apparatus that give below lab environment in product manual (if guide a loss, energy loss and thermal resistance) , compose builds systematic level model, model of most occupation standard also is do sth following a set pattern. However, these models that are based on product manual are the child of lab configuration and environment, can mirror not always actual in all sorts of conditions that encounter. Accordingly, cannot the model that ground of assume sth as a matter of course thinks these come from product manual can all sorts of complex parasitism environments that place of personnel of design of electron of accurate report electric power faces. In fact, the probability that the experimental environment of manufacturer and the applied environment that electric power electron designs staff agree completely is close to Yu Ling. The apparent difference between experimental environment and applied environment, the emulation result in bringing about actual application possibly appears gross error, error rate often is as high as 20-30% taller even. Want to solve this problem, must improve current practice as far as possible.

Ansenmei (the PLECS model self-help of Onsemi) makes a tool (SSPMG) is provided super- strong initiate a gender, the user is OK the parasitism environment with amid specific input, establish custom-built PLECS model. Make an example, off-the-peg business suit is unlikely completely formfitting, and SSPMG resembles measuring a body for you the advanced tailor of custom-built dress, can allow to make a model certainly according to specific applying.

Graph 1: Elite Power emulates tool and PLECS model self-help to make a tool

The core train of thought of SSPMG method backside actually very simple. The key that it pays close attention to is not the outcome that Ansenmei measures in the lab, however the specific application in your environment. The user can is opposite according to its respective environment the model undertakes fine tuning, can raise emulated accuracy significantly then. This kind of attention to custom-built sex and accuracy is an academic concept not just, fulfilled specific solution to go up however, can output practical result. Industry realizes in succession, current model is put in apparent limitation, and use in the light of diverse demand custom-built change emulate having tremendous latent capacity.

Emulation tool of An Sen beautiful SSPMG still supports user basis the parameter with custom-built concentrated data expresses electric bias voltage and temperature condition. The target is to ensure the interpolation between the several foothold inside the watch is accurate, reduce extrapolate demand as far as possible, because extrapolate often is met,bring an error to system simulation.

Graph 2: One of character of SSPMG: The loss parameter with concentrated data is expressed

The SSPMG kit that Ansenmei develops contained delegate electron product of different production condition ” attrib border model ” . Among them, the parameter such as voltage of threshold value voltage, RDSon, puncture, capacitance, the meeting because the physical character inside brilliant round factory is different and somewhat difference. The energy loss that this meeting affects the parts of an apparatus that be measured significantly, guide a loss and temperature behavior, capture consequently these relevant parameter difference are very significant, be in especially systematic level.

For this, ansenmei introduced the PLECS model that applies to hard switch and soft switch, still can use at synchronous commutate operation in addition, and be aimed at only advocate switch operation. PLECS tool can emulate all sorts of soft switch application, include develop of complete bridge of bridge of DC-DC LLC and CLLC resonance, double active and phase shift to attack.

Soft switch and hard switch

In domain of electric power electron, clear divisional soft switch and hard switch are very important. To hard switch, but double pulse of have the aid of checks (DPT) comes accurate computation loss. But the function of soft switch suffers develop to attack to be affected with working mode bigger, so double pulse checks cannot accurate computation its are specific loss.

To solve this problem, SSPMG uses instrument of new-style changeover loss to come accurate computation the energy loss that a series of develop attack, include phase shift complete bridge, DC-DC LLC and CLLC syntonic develop to attack. This kind is soft switch only and the method of the design promoted the soft switch model that often is ignored by industry precision. Come so, what the engineer can win design program is accurate express, avoid the error that place of incompatible emulation condition causes thereby. Have the aid of our compositive function, why to no matter use,plant switch develop attacks, design personnel can use accurate model, can ensure then emulated precision.

Graph 3: One of character of SSPMG: Soft switch is emulated

Switch loss checks

DPT is the commonly used method that measures loss of semiconductor device switch. The specific measure that this method adopts includes: Above all, through activationing low margin switch causes inductance electric current, when measuring low margin switch to close in dot of a certain electric current next involve loss. Inductance electric current continues to be maintained by high margin diode, because press,fall very low and duration is short, can think inductance electric current keeps constant so. Finally, low margin switch guides again, reason can be used with during closing, similar inductance electric current is measured guide a loss.

No matter the setting is medium,those who use is half bridge still be 1/4 bridge, can affect switch loss, because Xiaoteji puts SiC in characteristic difference between diode and MOSFET body diode,this basically is. This kind of configuration is called ” step up ” model instrument, can affect advocate switch loss, because of high margin switch / diode restores electric current mediumly reversely the loss of low margin switch when meeting shadow fugleman is connected.

The parasitism capacitance of inductor and element of ministry of substandard of PCB leakage feeling can affect active switch loss significantly. The parasitism capacitance of inductor can affect Eon and Eoff, affect total loss thereby. In addition, PCB leakage feels and with the ferrite at reducing EMI the parts of an apparatus such as magnetism bead is met the size that changes switch annulus way and function, decelerate electric current to climb slope and allow voltage to achieve inferior n, affect loss thereby.

Instrument of DPT double pulse can measure loss effectively, can affect very small circuit to provide high accuracy safeguard for parasitism component even. Although install the instrument of advanced double pulse of dark beauty to compare chip OK and outstandingly,dimension is mixed enclose wait for assorted element, but what must notice is, the loss below test environment and the loss that use setting actually to fall may be abhorrent. The user is specific adoption parasitism cell can affect actual loss greatly, because this is every design custom-built new setting is highbrow.

It is OK to be based on those who build a model to emulate replace this kind to be based on metrical resource concentrated, relatively confine and complex method. Use parameter to emulate with the emulation model with accurate height (the physics that is like Ansenmei can expand SPICE model) , electric power electron designs personnel to be able to build accurate loss model quickly. These emulation support are in odd second many setting are evaluated in moving, with arduous measurement technical photograph is compared, can faster, more economic ground provides valuable information.

Ansenmei’s SSPMG includes 30 many parameter, can be opposite double pulse or the emulation principle plan that change loss instrument undertake fine tuning, recover the schism of SiC MOSFET and power module loss then. The tool with this comprehensive function is integrated a variety of application phase and setting, support modification grid driving voltage, so electric power electron designs personnel to be able to build the PLECS loss model with accurate height efficiently in the light of specific application.

Graph 4: Fundamental of double pulse instrument pursues

Check study – dc charges quickly picket

Elite Power emulates tool and SSPMG to have outstanding function, can shorten significantly product development cycle, apply to need to optimize the domain that designs time line especially, flow to charge quickly continuously for example (DCFC) . 25 KW dc charges quickly is electric car charges the main component of infrastructure, among them tool deploy is a typical case. The exemple is here medium, emulation tool promoted generation and carborundum of the 3rd generation effectively of half bridge module compare research, accurate the efficiency difference that calculated both, as special as experimental result be identical.

Graph 5: Systematic board: Mechanical draft of PFC + DC-DC

The actual measurement data that Ansenmei is analysed and compared 25kW dc to be filled quickly and emulation result. Although emulate,mix small error exists between the total module loss that measures actually, but show good dependency. SSPMG derive model brought into layout parasitism effect and capacitance of electric machinery winding to wait for complex details, can raise the accuracy of emulation result, help Elite Power emulate a tool to offer more thorough analysis thereby.

All sorts of filter that interweave together with SiC MOSFET, amplifier and grid driver were formed charge the in-house framework of picket. Attack through using different module and develop, between AC-DC active converter and DC-DC converter daedal interaction be able to clear, achieve good performance then. Evaluate indication loss curve to be inside 10% limits of ± fluctuant, but emulate gave out fluctuant extent is ± the complex loss curve of 5% .

Graph 6: Measure an outcome

Emulate and the dynamic and mutual concern between observation data makes clear, build model and detailed measurement well and truly crucial to evaluating the performance of power electronic parts.

New trends

Elite Power emulates tool and SSPMG to be able to get used to all sorts of semiconductor technologies. These two kinds of tools are original and dedicated at SiC product, but patulous already recently present end the 7th generation (FS7) IGBT product. Two tools use is extensive, the engineer can be applied neatly at different parts of an apparatus, undertake be defininged oneself emulation according to specific requirement.

(Author: James Victory, Career of plan of An Sen beautiful power source group TDBuild model and emulation plan researcher)

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