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50KHz phase cut rectifier erratic...why?

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
 

Attachments

  • 50KHz phase cut rectifier.pdf
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  • 50KHz Phase cut rectifier.txt
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