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# 2.ヒューズのシンプルモデル

## on Sep 27, 2011

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2.ヒューズのシンプルモデル ...

2.ヒューズのシンプルモデル

エネルギーを考慮したヒューズモデルです。また、別の活用方法として、ヒューズモデルを活用して、耐圧の表現をさせることも出来ます。シミュレーションには破壊の概念がありませんので、このモデルの採用で破壊の概念を組み込む事ができます。

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## 2.ヒューズのシンプルモデルPresentation Transcript

• Contents
• Benefit of the Model
• Model Feature
• Parameter Settings
• Fuse Specification (Example)
• Fusing Time vs. DC Current
• Fusing Time vs. Current Pattern
• Specific Fuse Model
• Simulation Index
• 1. Benefit of the Model
• Easily create your own fuse models by setting a few parameters, that’s usually provided by the manufacturer’s datasheet.
• 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).
• The model is optimized to reduce the convergence error.
• 2. Model Feature
• The model accounts for:
• Current Rating
• Fuse Factor
• Internal Resistance
• Normal Melting I 2 t
• Enable the model to simulate fusing time (blow time) as a function of I 2 t.
• The model can be used for testing the blow time for the different current pattern.
• A one-shot switch, once fuse is opened it cannot be closed.
• 3. Parameter Settings
• Irate = the current rating of fuse [A]
• FF = Fusing Factor, the ratio of the minimum fusing current (the current that fuse start to heat up) to Irate .
• (e.g. Irate =400mA and the minimum fusing current is 620mA then FF = 620m/400m = 1.55)
• Rint = internal resistance of fuse
• I2t = Normal Melting value [A 2 , seconds]
• From the fuse specification, the model is characterized by setting parameters Irate, FF, Rint and I2t.
• 4. Fuse Specification (Example)
• 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.
All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 the minimum fusing current is 620mA, FF = 20m/400m = 1.55 Part No. Current Rating (mA) Internal R. max. (m  ) I 2 t (A 2 , seconds) CCF1N0.4 400 650 0.024
• 5. Fusing Time vs. DC Current
• The simulation result shows the fusing times, t F , (the time that fuse blows) at the different fuse currents, I F .
All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 t F = 960.962usec. at I F = 5A t F = 6.0051msec. at I F = 2A t F = 24.013msec. at I F = 1A Simulation Circuit *Analysis directives: .TRAN 0 1s 500u 100u .STEP PARAM dc_current LIST 1, 2, 5 Simulation Result
• 5. Fusing Time vs. DC Current
• 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%