This document describes the parameters of simple transformer models in SPICE simulations. It lists the default parameters for saturable core, ideal transformer, phase reverse transformer, and center tap transformer models. The parameters include saturation flux density, resistance, inductance, turns ratio, and winding resistances. Values for each parameter are provided as examples.

1. シンプルモデル：トランスモデルの
パラメータ及び説明について
2012年6月13日
株式会社ビー・テクノロジー
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Technologies Corporation 2012

2. シンプルモデル：トランスモデルのコアモデルのパラメータ(4つ)
Model Parameters:
BSAT  The saturation flux density (in teslas).
– e.g. 100mT, 350mT, 500mT
B-H Curve – Value = <BSAT>
test points
RLOSS  The resistor RLOSS represents a loss
when a voltage is applied.
– e.g. 0.5Ω, 1Ω, 100KΩ
– Value = <RLOSS>
LM  Magnetizing inductance of the core inductor
(in henry).
– e.g. 1uH, 5uH, 50uH
– Value = <LM>
Figure 1, Saturable core model (Default parameters).
BEXP  The exponent in the expression for
coupling factor KC.
– e.g. 2, 4, 8
– Value = <BEXP>
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3. シンプルモデル：トランスモデルのトランスモデルのパラメータ(4つ)
Parameter settings of 1:1 ideal transformer
Model Parameters:
LP  Inductance of primary winding (in henry).
– e.g. 100uH, 250uH, 500uH
– Value = <LP>
N  is the turns ratio of Ideal transformer.
– e.g. 0.1, 0.5, 1
Figure 2, 1:1 Ideal transformer (Default parameters). – Value = <N>
RP  A series resistance of primary winding (in ohm).
– e.g. 1mΩ, 10mΩ, 100mΩ
– Value = <RP>
RS  A series resistance of secondary winding (in ohm).
– e.g. 1mΩ, 10mΩ, 100mΩ
– Value = <RS>
Figure 3, 1:1 Phase reverse ideal transformer
(Default parameters).
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4. シンプルモデル：トランスモデルのトランスモデルのパラメータ(5つ)
Parameter settings of 2:1 ideal transformer
Model Parameters:
LP  Inductance of primary winding (in henry).
– e.g. 100uH, 250uH, 500uH
– Value = <LP>
N  is the turns ratio of Ideal transformer.
– e.g. 0.1, 0.5, 1
– Value = <N>
RP1  A series resistance of primary winding 1 (in ohm).
– e.g. 1mΩ, 10mΩ, 100mΩ
– Value = <RP1>
RP2  A series resistance of primary winding 2 (in ohm).
Figure 4, 2:1 Ideal transformer (Default parameters). – e.g. 1mΩ, 10mΩ, 100mΩ
– Value = <RP2>
RS  A series resistance of secondary winding (in ohm).
– e.g. 1mΩ, 10mΩ, 100mΩ
– Value = <RS>
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Technologies Corporation 2012

5. シンプルモデル：トランスモデルのトランスモデルのパラメータ(5つ)
Parameter settings of 1:2 ideal transformer
Model Parameters:
LP  Inductance of primary winding (in henry).
– e.g. 100uH, 250uH, 500uH
– Value = <LP>
N  is the turns ratio of Ideal transformer.
– e.g. 0.1, 0.5, 1
Figure 5, 1:2 Ideal transformer (Default parameters). – Value = <N>
RP  A series resistance of primary winding (in ohm).
– e.g. 1mΩ, 10mΩ, 100mΩ
– Value = <RP>
RS1  A series resistance of secondary winding 1 (in ohm).
– e.g. 1mΩ, 10mΩ, 100mΩ
– Value = <RS1>
RS2  A series resistance of secondary winding 2 (in ohm).
– e.g. 1mΩ, 10mΩ, 100mΩ
– Value = <RS2>
Figure 6, 1:2 Center tap ideal transformer
(Default parameters).
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