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Current sensor and power sensor

Shyam
Expert 1960 points

our project requirement is as below

want to measure input AC current and AC voltage which is having a frequency of 4Mhz, it's a sinusoidal input

isolation I feel can be provided by a transformer(i doubt the 4MHz frequency of input will do anything ?)

after its isolated from input, i want to pass it through a bridge rectifier to measure the ac voltage rms and power rms

kindly suggest me the approach to be followed, i did not see any high bandwidth AC input power monitor or current monitor

Regards

  • 0
    TI__Guru* 93105 points

    Hello Daram,

    Four Megahertz is RF and is beyond the frequency range of TI's current shunt monitors, which might otherwise be used to produce a voltage proportional to the current through a shunt resistor.

    I expect that better measurement performance in the 4 MHz range would be obtained using conventional RF measurement methods. The voltage is measured by rectifying the RF voltage and converting it to an RMS value. The current is measured using an RF current transformer whose output is rectified and converted to a proportional voltage.

    I found the following on-line article about RF current source transformers:

    The power is then calculated from the product of the measured voltage and current. You can find more about RF voltage and current measurements by doing a web search on the subjects.

    Regards, Thomas

    Precision Amplifiers Applications Engineering