Simple Model of Transformer using LTspice

Contents ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

[object Object],[object Object],1) Model Overview All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Saturation Flux Density B S H (A-turns/m) B (Teslas) Coercive Field H C Remanent Flux Density B r Saturation Field H S Figure 1 , Hysteresis Loop and Magnetic Properties.

2) Concept of the Model ,[object Object],[object Object],[object Object],[object Object],Ideal Transformer Simplified SPICE Behavioral Model [Model parameters: N, R P , R S and L P ] All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

3) Parameter Settings of Saturable Core ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Model Parameters: B-H Curve test points Figure 2 , Saturable core model (Default parameters).

4) Saturable core SUBCKT using LTspiceIV All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Figure 3 , Saturable core subcircuit SPICE compatible, the key parameters are shown in bold. Information of Netlist

5) Saturable Core Parameter Setting (Example) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Figure 4 , Dynamic Magnetization Curves. Specification   The data is provided in the datasheet Input the parameter BSAT=500m

5.1) Curve fitting: RLOSS ,[object Object],[object Object],All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 0.5 Ω --- 1 Ω --- 100K Ω --- Figure 5 , The magnetizing line difference, RLOSS. H (A-turns/m) B (Teslas)

5.2) Curve fitting: LM ,[object Object],[object Object],All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 1uH --- 5uH --- 50uH --- Figure 6 , The magnetizing line difference, LM . H (A-turns/m) B (Teslas)

5.3) Curve fitting: BEXP ,[object Object],[object Object],All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 2 --- 4 --- 8 --- Figure 7 , The magnetizing line difference, BEXP. H (A-turns/m) B (Teslas)

6) Dynamic Magnetizing Curves Characteristics - Evaluation Circuit and Setting ,[object Object],[object Object],[object Object],[object Object],[object Object],All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

6) Dynamic Magnetizing Curves Characteristics - Simulation Result ,[object Object],All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Figure 8 , Sine wave excitation Figure 9 , Square wave excitation

7) Basic Ideal Transformers and Their Parameters ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Figure 10 , Symbol of basic ideal transformer with The voltage to current relationships. N P N S I P I S V P V S 1 : N + - + - (7.2) (7.3) (7.1) N is the turns ratio of Ideal transformer (above).

7.1) Parameter settings of 1:1 ideal transformer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Model Parameters: Figure 11 , 1:1 Ideal transformer (Default parameters). Figure 12 , 1:1 Phase reverse ideal transformer (Default parameters).

7.2) Parameter settings of 2:1 ideal transformer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Model Parameters: Figure 13 , 2:1 Ideal transformer (Default parameters).

7.3) Parameter settings of 1:2 ideal transformer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Model Parameters: Figure 14 , 1:2 Ideal transformer (Default parameters). Figure 15 , 1:2 Center tap ideal transformer (Default parameters).

8) Saturable transformer SUBCKT Using LTspiceIV All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Figure 17 , Saturable transformer equivalent circuit. Figure 16 , Saturable transformer symbol, the key parameters are shown in bold. Information of Netlist

[object Object],[object Object],[object Object],9) 1:1 Saturable transformer model (Example) - Simulation Circuit and Setting All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Saturable transformer model Primary current Output Voltage 1 : {N} Secondary current

9) 1:1 Saturable transformer model (Example) - Simulation Result All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Input voltage Output voltage Input Current Output Current Figure 18 , The Input–Output Characteristics of 1:1 Saturable transformer.

[object Object],[object Object],[object Object],10) 1:1 Saturable transformer model (Example) - Simulation Circuit and Setting (Phase reverse) All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 1 : {N}

10) 1:1 Saturable transformer model (Example) - Simulation Result (Phase reverse) All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Figure 19 , The Input–Output Characteristics of 1:1 Saturable transformer (Phase reverse). Input voltage Output voltage Input Current Output Current

[object Object],[object Object],[object Object],11) 2:1 Saturable transformer model (Example) - Simulation Circuit and Setting All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 1 : {N}

11) 2:1 Saturable transformer model (Example) - Simulation Result All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Figure 20 , The Input–Output Characteristics of 2:1 Saturable transformer. Input voltage 1 Input Current 1 Output voltage Output Current Input voltage 2 Input Current 2

[object Object],[object Object],[object Object],12) 1:2 Saturable transformer model (Example) - Simulation Circuit and Setting All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 1 : {N}

12) 1:2 Saturable transformer model (Example) - Simulation Result All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Input voltage Output voltage 1 Input Current Output Current 1 Figure 21 , The Input–Output Characteristics of 1:2 Saturable transformer. Output voltage 2 Output Current 2

[object Object],[object Object],[object Object],13) 1:2 Saturable transformer model (Example) - Simulation Circuit and Setting (Center tap) All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 1 : {N}

13) 1:2 Saturable transformer model (Example) - Simulation Result (Center tap) All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Figure 22 , The Input–Output Characteristics of 1:2 Saturable transformer (Center tap). Input voltage Output voltage 1 Input Current Output Current 1 Output voltage 2 Output Current 2

[object Object],[object Object],[object Object],14) Application Circuit Example: Flyback converter - Simulation Circuit and Setting All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 1 : {N}

14) Application Circuit Example: Flyback converter - Simulation Result All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Secondary voltage of transformer Output voltage= 5Vdc Figure 23 , Flyback converter with Saturable transformer model. Output ripple voltage Secondary current of transformer V RIPPLE Input voltage= 24Vdc

Library Files and Symbol Files Location All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 … imulations C:rogram FilesTCTspiceIVibub C:rogram FilesTCTspiceIVibym Copy/Paste into Copy/Paste into ,[object Object],[object Object]

Library Files Index All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Model Library Symbol ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],score.sub tfmr1.sub tfmr1_rev.sub tfmr2prim.sub tfmr2.sub tfmr2_ct.sub SCORE.asy TFMR1.asy TFMR1_REV.asy TFMR2PRIM.asyTFMR2.asy TFMR2_CT.asy

Simulation Index All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Simulations Folder name ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Curve fitting Curve fitting Curve fitting Sat_Core Sat_Trans1 Sat_Trans2 Sat_Trans3 Sat_Trans4 Sat_Trans5 Appl

Simple Model of Transformer using LTspice

Recommended

Recommended

More Related Content

What's hot

What's hot (20)

Viewers also liked

Viewers also liked (20)

Similar to Simple Model of Transformer using LTspice

Similar to Simple Model of Transformer using LTspice (20)

More from Tsuyoshi Horigome

More from Tsuyoshi Horigome (20)

Recently uploaded

Recently uploaded (20)

Simple Model of Transformer using LTspice