Re: Active Regulation of DC Resonant Chargers

>I called Ross Engineering and inquired about their HV dividers.  They 
>a 15 and 30 kV divider applicable to our specifications.  Mr. Ross
>recommended a 30 kV divider if rectifying a 14.4 kV pig.  He does not
>recommend a wideband or compensated divider for DC or 60 Hz.  The 
>are fixed at the buyers requirement, example 1000:1.  They have very 
>input impedance, usually 300 megaohms.  So, divider output current is 
>Price for the 30 kV DC HV divider? --------   $900.00.
>No doubt an accurate HV divider can be built using HV, high wattage,
>precision resistors like those Victoreen resistors, the likes of which 
>Hull is so fond.
I recently bought a 1000:1 hv divider probe for my multimeter which is 
guaranteed to work to 40 KV . Input impedance = 1000meg, spec'd as 5% 
accuracy into a 10 meg multimeter or other measuring device. This cost 
me only about $200 so this  could be a good option to consider . Made by 
fluke and M/a com (2 options - fluke is more expensive)
>> On each charging pulse a regulation circuit monitors the HV divider,
>> and when the desired primary voltage is reached, the regulator fires 
>> an SCR which is connected to the shunt winding of the reactor.  The
>> SCR diverts the remaining stored reactor energy into a resistor bank,
>> and the voltage on the primary cap stops promptly at the set point.
>> This circuit works quite well, and the pulse-to-pulse accuracy is
>> limited only by the accuracy of the HV divider and regulator circuit.
>> Compensated dividers with better than 1% accuracy are commercially
>> available from Ross Engineering.

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