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Old 8th June 2013, 02:10 AM   #61
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Forgot to say...My power transformer is a Hammond 370EX (550V CT, 144 mA).
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Old 8th June 2013, 06:43 AM   #62
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Join Date: Feb 2002
Location: Lindau

Originally Posted by crazyfrog View Post
However, looking at other Hammond chokes, I would have to put two in series to get a "first choke combo" that holds the voltage.
If you are referring to the max. operating volts, specified by Hammond: Putting two chokes in series will not help since both chokes see the B+ voltage. In addition to the B+ voltage the first choke in a LCL filter sees high ripple voltage. If you want to use a LCL filter make sure the first choke is designed for choke input duty.

Best regards

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Old 8th June 2013, 12:33 PM   #63
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Yes the gap are not the same. Actually I was thinking about a "quasi-choke-input supply".
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Old 9th June 2013, 12:55 AM   #64
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Default new 801A HV supply

After few configurations, it ended with "bridge-600nF-30H (*)-20F " with 0,3V of ripple.

(*) the inductance is an approximation and may be more than that. Two 100mA chokes are in series and they are not running at full current. The "no load" value is 20H for each of them.
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