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lc filter for semi coontrolled rectifier and inverter load

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aumkota27

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HI everyone..

I am talking about the DC choke and capacitor bank which is placed after the semicontrolled rectifier and my load is an inverter.

My input current's positive and negative half cycles are getting unequal at ac voltages 200 and above. and at that time my DC choke is producing accoustic noise.

please throw some light on this ...why am i getting unequal current halfs.
 

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