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Can the LDC series chip work under strong magnetic fields when detecting tiny metals?

Annie Liu
Genius 10295 points

Hi Team,

The customer is experiencing below issue and needs your help.

If the LDC chip is applied to foreign object detection of high-power wireless charging, will the chip work be affected by the strong magnetic field of the main power? Is there a way to filter out the effects and make the chip work?

Thanks.

  • 0
    TI__Genius 17440 points

    Hi Annie,

    My apologies for the delayed reply; this thread slipped through the cracks. The LDC devices use an LC tank sensor, which is inherently a narrow bandpass filter. It is immune to DC magnetic fields, and is only sensitive to AC magnetic fields at the same sensor frequency (or harmonics of the sensor frequency). The sensor frequency can easily be moved away from the wireless charger's frequency by changing the capacitor in the LC tank. LDC devices could be a good fit for this application.

    Best Regards,