How to generate 3 sin. waves having phase difference of 120 deg

Thread Starter

leoxdragon

Joined Apr 2, 2009
8
Hi everyone. I have to design an voltage source inverter which uses PWM method to control the state on/off of some IGBT. However, I have a problem. I don't know how to generate 3 sinosoidal waves which have phase difference of 120 degree instantaneously. (My professor suggests that i should use Wien bridge circuit to generate the sine wave)
Can anyone suggest me something?
 

KL7AJ

Joined Nov 4, 2008
2,229
Hi everyone. I have to design an voltage source inverter which uses PWM method to control the state on/off of some IGBT. However, I have a problem. I don't know how to generate 3 sinosoidal waves which have phase difference of 120 degree instantaneously. (My professor suggests that i should use Wien bridge circuit to generate the sine wave)
Can anyone suggest me something?

This can be done with a three "partial phase shift" op amps in a loop. One was posted here quite recently. Stand by while I look for it. :)

eric
 
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