DropXL ModelDROPXL01 FCCID:X3QDROPXL01 TechnicalDescription:
Thefollowingrequirementshavebeenmetaccordingtoclause5bof680106D01RFExposure WirelessChargingAppv03.
(1) Powertransferfrequencyislessthan1MHz. Ans:theoperatingfrequencyis110kHz205kHz
(2) Outputpowerfromeachprimarycoilislessthanorequalto15watts. Ans:TheWPTislessthan15watts.
(3) Thetransfersystemincludesonlysingleprimaryandsecondarycoils.Thisincludescharging systems that may have multiple primary coils and clients that are able to detect and allow couplingonlybetweenindividualpairsofcoils. Ans:Twodifferentclientdevicescanputontothewirelesschargingdeviceforchargingatthe sametime,buteachchargingareazonecanonlyacceptssingleclientdeviceonly.
(4) Clientdeviceisplaceddirectlyincontactwiththetransmitter. Ans:Yes.
(5) Mobile exposure conditions only (portable exposure conditions are not covered by this exclusion). Ans:Yes,itisnotforportableuse.
(6) TheaggregateHfieldstrengthsat15cmsurroundingthedeviceand20cmabovethetop surfacefromallsimultaneoustransmittingcoilsaredemonstratedtobelessthan50%oftheMPE limit. Ans:theresultcanbefoundonRFexposurereport. CircuitryDescription TheproductisawirelesschargingtransmittermeetingtheWPCQistandardandcansupply allthewirelesschargingreceiverwhichalsomeetingtheQistandard. Wireless charging system use magnetic induction wireless charging technology, energy transmissionisrealizedbyusingseriesresonancemethod.ThemaincontrolchipICRT3181C,itis work with inverter circuit, TX coil L, resonant circuit, capacitance C and other components combinedaswirelesschargingtransmitter.TXinputsideinputDCvoltage(15V),theDCvoltage passthroughpowerfullbridgeU2/U3andproducesanACvoltage,givetheTXcoilACelectric signal, AC electrical signals change to changing magnetic field, the AC electrical signal work frequencyis110~205KHz.ThechangingmagneticfieldpassthroughtheRXcoil,thereceivingcoil will generate an electric filed. And the system communicates through demodulation the AM signal which coupled to the transmitting coil from RX coil, and TX system controls the energy transmissionthroughtheadjustmentoffrequency,phaseanddutycycle.