修改变压器参数的方法
第一种方法：
.SUBCKT ts_pwr_10_to_1 1 2 3 4 5 //.SUBCKT 是子电路命令。

此子电路名为“ts_pwr_10_to_1 ”；有5 个引脚
* *1, 2-- primary winding, *3,4-- secondary terminal, 5-- neutural //注释行。

1，2为主绕组；3，4为副绕组终端；5为中间抽头。

Rs1 1 11 1.000e-3 //Rs1 为1 11端之电阻，值为1/1000欧。

Rl2 31 3 1.000e-3 //R12 为31 1端之电阻，值为1/1000欧。

Rl3 41 4 1.000e-3 //R13 为41 1端之电阻，值为1/1000欧。

L1 11 2 5.000e+000 //L1为11 2端之电感量，值为5亨。

L2 31 5 5.000e-002 //L1为31 5端之电感量，值为0.05亨。

L3 5 41 5.000e-002 //L1为5 41端之电感量，值为0.05亨。

K12 L1 L2 9.999e-001 //K12 为L1和L2之间的耦合系数，值为0.9999。

注：0<K<1
K13 L1 L3 9.999e-001 //K13 为L1和L3之间的耦合系数，值为0.9999。

K23 L2 L3 9.999e-001 //K12 为L2和L3之间的耦合系数，值为0.9999。

.ENDS //子电路结束。

============= Model template =================
如想更改变比，可试行修改电感量。

第二种方法
在Multisim中创建一个230/12V的变压器
To create a 230 to 12 volt transformer, please follow the instructions below:
1. Start up Multisim.
2. Enter the Basic Bin and click on the Linear Transformer button
(Transformer with the center tap).
3. In the Browser - Basic window, click on the TS_IDEAL Transformer Model.
4. Click on the Edit button at the bottom of the window.
5. Click Ok on the Database Select - To window (should be set at User).
6. In the Component Properties window, click on the Model Tab and under the
Model Data window, you will find the following:
.SUBCKT ts_audio_10_to_1 1 2 3 4 5
* EWB Version 4 - Transformer Model
* n= 10 Le= 1e-006 Lm= 0.001 Rp= 1e-006 Rs= 1e-006
Rp 1 6 1e-006ohm
Rs1 10 3 1e-006ohm
Rs2 11 5 5e-007ohm
Le 6 7 1e-006H
Lm 7 2 0.001H
E1 9 8 7 2 0.026
E2 8 4 7 2 0.026
V1 9 10 DC 0V
V2 8 11 DC 0V
F1 7 2 V1 0.052
F2 7 2 V2 0.052
.ENDS
In order to set the Turn Ratio to a different value (eg 230 to 12 turn
ratio), change the F1 and F2 value for 1/n (1/19.167=0.052; 230 to 12 turn ratio where n=primary/secondary). Also note that you must set E1 and E2 to F/2
(0.052/2=0.026 turn ratio).
7. Set the desired turn ratio.
8. Click on the Save/Exit button at the bottom of the window.
9. In the previous window, click on the Cancel button.
10. Select Refresh Component Toolbars under the View menu.
11. Enable the User Database and under the Basic Bin, you will find your Transformer Model.
I have also attached a file containning a Transformer with the above
Netlist
implemented. (File posted at:
/ewb/trans_230_12.msm)
Summary:
F1 and F2=1/n
where
n=primary turns/secondary turns
E1 and E2=F1/2
I hope this helps.
Best regards,
Luis Alves
Technical Support。