Phone: 636.343.8518
Fax: 636.343.5119
Email: sales@crmagnetics.com
CR Magnetics
Forums
PrevPrev Go to previous topic
NextNext Go to next topic
Forums CRMagnetics Discussion Forums General Discussion
Last Post 07/23/2013 1:07 PM by  Tony Hodges
Hi-Freq Lamp Ballast Current Monitoring
 1 Replies
Sort:
Please register and login to participate in the forums.
Author Messages
Basel Z
New Member
New Member
Posts:1


--
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


    --
    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.
    Please register and login to participate in the forums.

    Forums CRMagnetics Discussion Forums General Discussion
    Copyright 2024 by CR Magnetics