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50KHz phase cut rectifier erratic...why?

Discussion in 'General Electronics Discussion' started by eem2am, Jan 13, 2013.

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  1. eem2am

    eem2am

    414
    0
    Aug 3, 2009
    Hello,

    Please can you help solve the erratic switching that’s happening in my phase cut rectifier?

    [this is a variation on a similar previous post which i have "new posted" due to extra info by way of schematic & simulation)

    I have a 50KHz (sinusoidal) rectifier to which I have added phase cut circuitry, (to reduce the average output current)

    Schematic………………………
    http://i49.tinypic.com/34rucgj.jpg
    (attached is clearer)

    Output current waveform with no phase cutting………….
    http://i45.tinypic.com/kcl3z9.jpg


    Output current waveform with phase cutting………….
    http://i47.tinypic.com/14y3iw9.jpg

    ..how can I get rid of the bit where the waveform switches erratically near time = 70us?



    LTspice .txt file attached...pse convert to .asc
     

    Attached Files:

    Last edited: Jan 13, 2013
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