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