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  1. #1
    Newbie level 4
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    pure sine wave inverter

    Hi all,
    I have read some very exciting stuff on this forum and i am hoping some of you electronics gurus can help me. I am building a pure sine wave inverter using a wien-bridge for my oscillator. Input voltage = 12v dc, Output voltage= between 30v and 60 v ac, output current not to exceed 2A. Frequency = 50hz. I have used a JFET in the negative feedback circuit for AGC. My problem is that the output of this circuit takes 'forever' to begin oscillating. However when it does the waveform is a pure sinewave. How can i make the oscillations to start quicker and to build maximum amplitude quicker? I want to feed this output together with a triangular wave into a comparator so as to get a PWM signal to switch push-pull transistors?
    Thank you.

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  2. #2
    Full Member level 3
    Points: 1,694, Level: 9

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    Re: pure sine wave inverter

    This means that the small signal loop gain is very near to one. You may increase your loop gain to get your output oscillation faster.


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