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Fuse Simplified SPICE Behavioral Model All Rights Reserved Copyright (C) Bee Technologies Corporation 2011
Contents <ul><li>Benefit of the Model </li></ul><ul><li>Model Feature </li></ul><ul><li>Parameter Settings </li></ul><ul><...
1. Benefit of the Model <ul><li>Easily create your own fuse models by setting a few parameters, that’s usually provided by...
2. Model Feature <ul><li>The model accounts for: </li></ul><ul><ul><li>Current Rating </li></ul></ul><ul><ul><li>Fuse Fact...
3. Parameter Settings <ul><ul><li>Irate  = the current rating of fuse [A] </li></ul></ul><ul><ul><li>FF   =  Fusing Factor...
4. Fuse Specification (Example) <ul><li>Fig.3 Shows the complete setting of fuse model parameters by using data from the d...
5. Fusing Time vs. DC Current <ul><li>The simulation result shows the fusing times, t F , (the time that fuse blows) at th...
5. Fusing Time vs. DC Current <ul><li>Graph shows the comparison result between the simulation result vs. the measurement ...
6 Fusing Time vs. Current Pattern <ul><li>The simulation result shows the fusing times, t F , (the time that fuse blows) f...
7. Specific Fuse Model <ul><li>If the most accurate result is required, we could provide the specific model that optimized...
Library Files and Symbol Files Location All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 … Fuse_smpl C:...
Simulation Index All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 Simulations Folder name <ul><li>Fusin...
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Simple model of Fuse(LTspice)

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Simple model of Fuse(PSpice)

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Simple model of Fuse(LTspice)

  1. 1. Fuse Simplified SPICE Behavioral Model All Rights Reserved Copyright (C) Bee Technologies Corporation 2011
  2. 2. Contents <ul><li>Benefit of the Model </li></ul><ul><li>Model Feature </li></ul><ul><li>Parameter Settings </li></ul><ul><li>Fuse Specification (Example) </li></ul><ul><li>Fusing Time vs. DC Current </li></ul><ul><li>Fusing Time vs. Current Pattern </li></ul><ul><li>Specific Fuse Model </li></ul><ul><li>Library Files and Symbol Files Location </li></ul><ul><ul><li>Simulation Index </li></ul></ul>All Rights Reserved Copyright (C) Bee Technologies Corporation 2011
  3. 3. 1. Benefit of the Model <ul><li>Easily create your own fuse models by setting a few parameters, that’s usually provided by the manufacturer’s datasheet. </li></ul><ul><li>Enables circuit designer to safely test and optimize their circuit protection design, and to predict component and circuit stress under extreme conditions (e.g. at the fuse blow). </li></ul><ul><li>The model is optimized to reduce the convergence error. </li></ul>All Rights Reserved Copyright (C) Bee Technologies Corporation 2011
  4. 4. 2. Model Feature <ul><li>The model accounts for: </li></ul><ul><ul><li>Current Rating </li></ul></ul><ul><ul><li>Fuse Factor </li></ul></ul><ul><ul><li>Internal Resistance </li></ul></ul><ul><ul><li>Normal Melting I 2 t </li></ul></ul><ul><li>Enable the model to simulate fusing time (blow time) as a function of I 2 t. </li></ul><ul><li>The model can be used for testing the blow time for the different current pattern. </li></ul><ul><li>A one-shot switch, once fuse is opened it cannot be closed. </li></ul>All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 Fig.1 Fusing Time vs. Fusing Current Characteristic
  5. 5. 3. Parameter Settings <ul><ul><li>Irate = the current rating of fuse [A] </li></ul></ul><ul><ul><li>FF = Fusing Factor, the ratio of the minimum fusing current (the current that fuse start to heat up) to Irate . </li></ul></ul><ul><ul><ul><li>(e.g. Irate =400mA and the minimum fusing current is 620mA then FF = 620m/400m = 1.55) </li></ul></ul></ul><ul><ul><li>Rint = internal resistance of fuse </li></ul></ul><ul><ul><li>I2t = Normal Melting value [A 2 , seconds] </li></ul></ul><ul><li>From the fuse specification, the model is characterized by setting parameters Irate, FF, Rint and I2t. </li></ul>All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 Model Parameters: Fig.2 Fuse model with default parameters IRATE = 400m FF = 1.55 RINT = 650m I2T = 0.024
  6. 6. 4. Fuse Specification (Example) <ul><li>Fig.3 Shows the complete setting of fuse model parameters by using data from the datasheet of CCF1N0.4 provided by KOA Speer Electronics, Inc. </li></ul>All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 the minimum fusing current is 620mA, FF = 20m/400m = 1.55 IRATE = 400m FF = 1.55 RINT = 650m I2T = 0.024 Part No. Current Rating (mA) Internal R. max. (m  ) I 2 t (A 2 , seconds) CCF1N0.4 400 650 0.024
  7. 7. 5. Fusing Time vs. DC Current <ul><li>The simulation result shows the fusing times, t F , (the time that fuse blows) at the different fuse currents, I F . </li></ul>All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 t F = 956.677usec. at I F = 5A t F = 5.9221msec. at I F = 2A t F = 23.7861msec. at I F = 1A Simulation Circuit *Analysis directives: .TRAN 0 1s 0 100u .STEP PARAM dc_current LIST 1, 2, 5 *Integration Method: trapezoidal Simulation Result
  8. 8. 5. Fusing Time vs. DC Current <ul><li>Graph shows the comparison result between the simulation result vs. the measurement data. The fusing current error (average from 0.001-10 sec.) = 4.9% </li></ul>All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 Comparison Graph
  9. 9. 6 Fusing Time vs. Current Pattern <ul><li>The simulation result shows the fusing times, t F , (the time that fuse blows) for the same peak current but different in current patterns(waveforms). </li></ul>All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 t F = 59.984msec. for sine wave t F = 150.041msec. for triangle wave Simulation Circuit Simulation Result .TRAN 0 0.2s 0 100u *Integration Method: trapezoidal
  10. 10. 7. Specific Fuse Model <ul><li>If the most accurate result is required, we could provide the specific model that optimized for each part number of fuse. The fusing current error (average from 0.001-10 sec.) will reduce from 4.9% (simplified model) to 0.4% (specific fuse model) </li></ul>All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 Model of fuse part number CCF10.4, all parameters and function are already set Error reduce to 0.4% Comparison Graph
  11. 11. Library Files and Symbol Files Location All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 … Fuse_smpl C:Program FilesLTCLTspiceIVlibsub C:Program FilesLTCLTspiceIVlibsym Copy/Paste into Copy/Paste into <ul><li>Copy the library files (.lib) from the folder …Fuse_smpl.sub, then paste into the folder C:Program FilesLTCLTspiceIVlibsub </li></ul><ul><li>Copy the symbol files(.asy) from the folder …Fuse_smpl.asy, then paste into the folder C:Program FilesLTCLTspiceIVlibsym </li></ul>
  12. 12. Simulation Index All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 Simulations Folder name <ul><li>Fusing Time vs. DC Current.................................. </li></ul><ul><li>Fusing Time vs. Current Pattern............................ </li></ul>DC Pattern

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