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Last Post 07/23/2013 1:07 PM by  Tony Hodges
Hi-Freq Lamp Ballast Current Monitoring
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Basel Z
New Member
New Member
Posts:1


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07/23/2013 12:25 PM
    Hello,

    I have an application where I want to monitor the current from the output of a lamp ballast. The Ballast specs:

    * Output is a sine-wave (mostly sine-wave, but gets a bit distorted at higher output power)
    * Vout = 200-400V (peak at 1600V during ignition <250ms)
    * Iout = 3-10A (12A max)
    * Freq = 40-200kHz

    I believe the CR8448-2000-F is my best choose.

    I have a rectifying op-amp circuit to receive the output of the CT and I'm thinking of using a burden resistor of 250 ohms.

    Please let me know if I have missed anything or if you think there is a better solution.


    Thanks
    /Basel

    Tony Hodges
    CRM Staff
    Basic Member
    Basic Member
    Posts:154


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    07/23/2013 1:07 PM
    Dear Sir,

    The ferrite core “-F” units would be the recommended choice for high frequency sensing. Please note that a simple rectify-filter stage to create DC to be measured is not a true rms process, and as such will give different response for different frequency inputs.
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